/*------------------------------------------------------------------------- * * jsonfuncs.c * Functions to process JSON data types. * * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * IDENTIFICATION * src/backend/utils/adt/jsonfuncs.c * *------------------------------------------------------------------------- */ #include "postgres.h" #include #include "access/htup_details.h" #include "catalog/pg_type.h" #include "common/jsonapi.h" #include "common/string.h" #include "fmgr.h" #include "funcapi.h" #include "lib/stringinfo.h" #include "mb/pg_wchar.h" #include "miscadmin.h" #include "utils/array.h" #include "utils/builtins.h" #include "utils/fmgroids.h" #include "utils/hsearch.h" #include "utils/json.h" #include "utils/jsonb.h" #include "utils/jsonfuncs.h" #include "utils/lsyscache.h" #include "utils/memutils.h" #include "utils/syscache.h" #include "utils/typcache.h" /* Operations available for setPath */ #define JB_PATH_CREATE 0x0001 #define JB_PATH_DELETE 0x0002 #define JB_PATH_REPLACE 0x0004 #define JB_PATH_INSERT_BEFORE 0x0008 #define JB_PATH_INSERT_AFTER 0x0010 #define JB_PATH_CREATE_OR_INSERT \ (JB_PATH_INSERT_BEFORE | JB_PATH_INSERT_AFTER | JB_PATH_CREATE) #define JB_PATH_FILL_GAPS 0x0020 #define JB_PATH_CONSISTENT_POSITION 0x0040 /* state for json_object_keys */ typedef struct OkeysState { JsonLexContext *lex; char **result; int result_size; int result_count; int sent_count; } OkeysState; /* state for iterate_json_values function */ typedef struct IterateJsonStringValuesState { JsonLexContext *lex; JsonIterateStringValuesAction action; /* an action that will be applied * to each json value */ void *action_state; /* any necessary context for iteration */ uint32 flags; /* what kind of elements from a json we want * to iterate */ } IterateJsonStringValuesState; /* state for transform_json_string_values function */ typedef struct TransformJsonStringValuesState { JsonLexContext *lex; StringInfo strval; /* resulting json */ JsonTransformStringValuesAction action; /* an action that will be applied * to each json value */ void *action_state; /* any necessary context for transformation */ } TransformJsonStringValuesState; /* state for json_get* functions */ typedef struct GetState { JsonLexContext *lex; text *tresult; char *result_start; bool normalize_results; bool next_scalar; int npath; /* length of each path-related array */ char **path_names; /* field name(s) being sought */ int *path_indexes; /* array index(es) being sought */ bool *pathok; /* is path matched to current depth? */ int *array_cur_index; /* current element index at each path * level */ } GetState; /* state for json_array_length */ typedef struct AlenState { JsonLexContext *lex; int count; } AlenState; /* state for json_each */ typedef struct EachState { JsonLexContext *lex; Tuplestorestate *tuple_store; TupleDesc ret_tdesc; MemoryContext tmp_cxt; char *result_start; bool normalize_results; bool next_scalar; char *normalized_scalar; } EachState; /* state for json_array_elements */ typedef struct ElementsState { JsonLexContext *lex; const char *function_name; Tuplestorestate *tuple_store; TupleDesc ret_tdesc; MemoryContext tmp_cxt; char *result_start; bool normalize_results; bool next_scalar; char *normalized_scalar; } ElementsState; /* state for get_json_object_as_hash */ typedef struct JHashState { JsonLexContext *lex; const char *function_name; HTAB *hash; char *saved_scalar; char *save_json_start; JsonTokenType saved_token_type; } JHashState; /* hashtable element */ typedef struct JsonHashEntry { char fname[NAMEDATALEN]; /* hash key (MUST BE FIRST) */ char *val; JsonTokenType type; } JsonHashEntry; /* structure to cache type I/O metadata needed for populate_scalar() */ typedef struct ScalarIOData { Oid typioparam; FmgrInfo typiofunc; } ScalarIOData; /* these two structures are used recursively */ typedef struct ColumnIOData ColumnIOData; typedef struct RecordIOData RecordIOData; /* structure to cache metadata needed for populate_array() */ typedef struct ArrayIOData { ColumnIOData *element_info; /* metadata cache */ Oid element_type; /* array element type id */ int32 element_typmod; /* array element type modifier */ } ArrayIOData; /* structure to cache metadata needed for populate_composite() */ typedef struct CompositeIOData { /* * We use pointer to a RecordIOData here because variable-length struct * RecordIOData can't be used directly in ColumnIOData.io union */ RecordIOData *record_io; /* metadata cache for populate_record() */ TupleDesc tupdesc; /* cached tuple descriptor */ /* these fields differ from target type only if domain over composite: */ Oid base_typid; /* base type id */ int32 base_typmod; /* base type modifier */ /* this field is used only if target type is domain over composite: */ void *domain_info; /* opaque cache for domain checks */ } CompositeIOData; /* structure to cache metadata needed for populate_domain() */ typedef struct DomainIOData { ColumnIOData *base_io; /* metadata cache */ Oid base_typid; /* base type id */ int32 base_typmod; /* base type modifier */ void *domain_info; /* opaque cache for domain checks */ } DomainIOData; /* enumeration type categories */ typedef enum TypeCat { TYPECAT_SCALAR = 's', TYPECAT_ARRAY = 'a', TYPECAT_COMPOSITE = 'c', TYPECAT_COMPOSITE_DOMAIN = 'C', TYPECAT_DOMAIN = 'd' } TypeCat; /* these two are stolen from hstore / record_out, used in populate_record* */ /* structure to cache record metadata needed for populate_record_field() */ struct ColumnIOData { Oid typid; /* column type id */ int32 typmod; /* column type modifier */ TypeCat typcat; /* column type category */ ScalarIOData scalar_io; /* metadata cache for direct conversion * through input function */ union { ArrayIOData array; CompositeIOData composite; DomainIOData domain; } io; /* metadata cache for various column type * categories */ }; /* structure to cache record metadata needed for populate_record() */ struct RecordIOData { Oid record_type; int32 record_typmod; int ncolumns; ColumnIOData columns[FLEXIBLE_ARRAY_MEMBER]; }; /* per-query cache for populate_record_worker and populate_recordset_worker */ typedef struct PopulateRecordCache { Oid argtype; /* declared type of the record argument */ ColumnIOData c; /* metadata cache for populate_composite() */ MemoryContext fn_mcxt; /* where this is stored */ } PopulateRecordCache; /* per-call state for populate_recordset */ typedef struct PopulateRecordsetState { JsonLexContext *lex; const char *function_name; HTAB *json_hash; char *saved_scalar; char *save_json_start; JsonTokenType saved_token_type; Tuplestorestate *tuple_store; HeapTupleHeader rec; PopulateRecordCache *cache; } PopulateRecordsetState; /* common data for populate_array_json() and populate_array_dim_jsonb() */ typedef struct PopulateArrayContext { ArrayBuildState *astate; /* array build state */ ArrayIOData *aio; /* metadata cache */ MemoryContext acxt; /* array build memory context */ MemoryContext mcxt; /* cache memory context */ const char *colname; /* for diagnostics only */ int *dims; /* dimensions */ int *sizes; /* current dimension counters */ int ndims; /* number of dimensions */ } PopulateArrayContext; /* state for populate_array_json() */ typedef struct PopulateArrayState { JsonLexContext *lex; /* json lexer */ PopulateArrayContext *ctx; /* context */ char *element_start; /* start of the current array element */ char *element_scalar; /* current array element token if it is a * scalar */ JsonTokenType element_type; /* current array element type */ } PopulateArrayState; /* state for json_strip_nulls */ typedef struct StripnullState { JsonLexContext *lex; StringInfo strval; bool skip_next_null; } StripnullState; /* structure for generalized json/jsonb value passing */ typedef struct JsValue { bool is_json; /* json/jsonb */ union { struct { char *str; /* json string */ int len; /* json string length or -1 if null-terminated */ JsonTokenType type; /* json type */ } json; /* json value */ JsonbValue *jsonb; /* jsonb value */ } val; } JsValue; typedef struct JsObject { bool is_json; /* json/jsonb */ union { HTAB *json_hash; JsonbContainer *jsonb_cont; } val; } JsObject; /* useful macros for testing JsValue properties */ #define JsValueIsNull(jsv) \ ((jsv)->is_json ? \ (!(jsv)->val.json.str || (jsv)->val.json.type == JSON_TOKEN_NULL) : \ (!(jsv)->val.jsonb || (jsv)->val.jsonb->type == jbvNull)) #define JsValueIsString(jsv) \ ((jsv)->is_json ? (jsv)->val.json.type == JSON_TOKEN_STRING \ : ((jsv)->val.jsonb && (jsv)->val.jsonb->type == jbvString)) #define JsObjectIsEmpty(jso) \ ((jso)->is_json \ ? hash_get_num_entries((jso)->val.json_hash) == 0 \ : ((jso)->val.jsonb_cont == NULL || \ JsonContainerSize((jso)->val.jsonb_cont) == 0)) #define JsObjectFree(jso) \ do { \ if ((jso)->is_json) \ hash_destroy((jso)->val.json_hash); \ } while (0) static int report_json_context(JsonLexContext *lex); /* semantic action functions for json_object_keys */ static void okeys_object_field_start(void *state, char *fname, bool isnull); static void okeys_array_start(void *state); static void okeys_scalar(void *state, char *token, JsonTokenType tokentype); /* semantic action functions for json_get* functions */ static void get_object_start(void *state); static void get_object_end(void *state); static void get_object_field_start(void *state, char *fname, bool isnull); static void get_object_field_end(void *state, char *fname, bool isnull); static void get_array_start(void *state); static void get_array_end(void *state); static void get_array_element_start(void *state, bool isnull); static void get_array_element_end(void *state, bool isnull); static void get_scalar(void *state, char *token, JsonTokenType tokentype); /* common worker function for json getter functions */ static Datum get_path_all(FunctionCallInfo fcinfo, bool as_text); static text *get_worker(text *json, char **tpath, int *ipath, int npath, bool normalize_results); static Datum get_jsonb_path_all(FunctionCallInfo fcinfo, bool as_text); static text *JsonbValueAsText(JsonbValue *v); /* semantic action functions for json_array_length */ static void alen_object_start(void *state); static void alen_scalar(void *state, char *token, JsonTokenType tokentype); static void alen_array_element_start(void *state, bool isnull); /* common workers for json{b}_each* functions */ static Datum each_worker(FunctionCallInfo fcinfo, bool as_text); static Datum each_worker_jsonb(FunctionCallInfo fcinfo, const char *funcname, bool as_text); /* semantic action functions for json_each */ static void each_object_field_start(void *state, char *fname, bool isnull); static void each_object_field_end(void *state, char *fname, bool isnull); static void each_array_start(void *state); static void each_scalar(void *state, char *token, JsonTokenType tokentype); /* common workers for json{b}_array_elements_* functions */ static Datum elements_worker(FunctionCallInfo fcinfo, const char *funcname, bool as_text); static Datum elements_worker_jsonb(FunctionCallInfo fcinfo, const char *funcname, bool as_text); /* semantic action functions for json_array_elements */ static void elements_object_start(void *state); static void elements_array_element_start(void *state, bool isnull); static void elements_array_element_end(void *state, bool isnull); static void elements_scalar(void *state, char *token, JsonTokenType tokentype); /* turn a json object into a hash table */ static HTAB *get_json_object_as_hash(char *json, int len, const char *funcname); /* semantic actions for populate_array_json */ static void populate_array_object_start(void *_state); static void populate_array_array_end(void *_state); static void populate_array_element_start(void *_state, bool isnull); static void populate_array_element_end(void *_state, bool isnull); static void populate_array_scalar(void *_state, char *token, JsonTokenType tokentype); /* semantic action functions for get_json_object_as_hash */ static void hash_object_field_start(void *state, char *fname, bool isnull); static void hash_object_field_end(void *state, char *fname, bool isnull); static void hash_array_start(void *state); static void hash_scalar(void *state, char *token, JsonTokenType tokentype); /* semantic action functions for populate_recordset */ static void populate_recordset_object_field_start(void *state, char *fname, bool isnull); static void populate_recordset_object_field_end(void *state, char *fname, bool isnull); static void populate_recordset_scalar(void *state, char *token, JsonTokenType tokentype); static void populate_recordset_object_start(void *state); static void populate_recordset_object_end(void *state); static void populate_recordset_array_start(void *state); static void populate_recordset_array_element_start(void *state, bool isnull); /* semantic action functions for json_strip_nulls */ static void sn_object_start(void *state); static void sn_object_end(void *state); static void sn_array_start(void *state); static void sn_array_end(void *state); static void sn_object_field_start(void *state, char *fname, bool isnull); static void sn_array_element_start(void *state, bool isnull); static void sn_scalar(void *state, char *token, JsonTokenType tokentype); /* worker functions for populate_record, to_record, populate_recordset and to_recordset */ static Datum populate_recordset_worker(FunctionCallInfo fcinfo, const char *funcname, bool is_json, bool have_record_arg); static Datum populate_record_worker(FunctionCallInfo fcinfo, const char *funcname, bool is_json, bool have_record_arg); /* helper functions for populate_record[set] */ static HeapTupleHeader populate_record(TupleDesc tupdesc, RecordIOData **record_p, HeapTupleHeader defaultval, MemoryContext mcxt, JsObject *obj); static void get_record_type_from_argument(FunctionCallInfo fcinfo, const char *funcname, PopulateRecordCache *cache); static void get_record_type_from_query(FunctionCallInfo fcinfo, const char *funcname, PopulateRecordCache *cache); static void JsValueToJsObject(JsValue *jsv, JsObject *jso); static Datum populate_composite(CompositeIOData *io, Oid typid, const char *colname, MemoryContext mcxt, HeapTupleHeader defaultval, JsValue *jsv, bool isnull); static Datum populate_scalar(ScalarIOData *io, Oid typid, int32 typmod, JsValue *jsv); static void prepare_column_cache(ColumnIOData *column, Oid typid, int32 typmod, MemoryContext mcxt, bool need_scalar); static Datum populate_record_field(ColumnIOData *col, Oid typid, int32 typmod, const char *colname, MemoryContext mcxt, Datum defaultval, JsValue *jsv, bool *isnull); static RecordIOData *allocate_record_info(MemoryContext mcxt, int ncolumns); static bool JsObjectGetField(JsObject *obj, char *field, JsValue *jsv); static void populate_recordset_record(PopulateRecordsetState *state, JsObject *obj); static void populate_array_json(PopulateArrayContext *ctx, char *json, int len); static void populate_array_dim_jsonb(PopulateArrayContext *ctx, JsonbValue *jbv, int ndim); static void populate_array_report_expected_array(PopulateArrayContext *ctx, int ndim); static void populate_array_assign_ndims(PopulateArrayContext *ctx, int ndims); static void populate_array_check_dimension(PopulateArrayContext *ctx, int ndim); static void populate_array_element(PopulateArrayContext *ctx, int ndim, JsValue *jsv); static Datum populate_array(ArrayIOData *aio, const char *colname, MemoryContext mcxt, JsValue *jsv); static Datum populate_domain(DomainIOData *io, Oid typid, const char *colname, MemoryContext mcxt, JsValue *jsv, bool isnull); /* functions supporting jsonb_delete, jsonb_set and jsonb_concat */ static JsonbValue *IteratorConcat(JsonbIterator **it1, JsonbIterator **it2, JsonbParseState **state); static JsonbValue *setPath(JsonbIterator **it, Datum *path_elems, bool *path_nulls, int path_len, JsonbParseState **st, int level, JsonbValue *newval, int op_type); static void setPathObject(JsonbIterator **it, Datum *path_elems, bool *path_nulls, int path_len, JsonbParseState **st, int level, JsonbValue *newval, uint32 npairs, int op_type); static void setPathArray(JsonbIterator **it, Datum *path_elems, bool *path_nulls, int path_len, JsonbParseState **st, int level, JsonbValue *newval, uint32 nelems, int op_type); /* function supporting iterate_json_values */ static void iterate_values_scalar(void *state, char *token, JsonTokenType tokentype); static void iterate_values_object_field_start(void *state, char *fname, bool isnull); /* functions supporting transform_json_string_values */ static void transform_string_values_object_start(void *state); static void transform_string_values_object_end(void *state); static void transform_string_values_array_start(void *state); static void transform_string_values_array_end(void *state); static void transform_string_values_object_field_start(void *state, char *fname, bool isnull); static void transform_string_values_array_element_start(void *state, bool isnull); static void transform_string_values_scalar(void *state, char *token, JsonTokenType tokentype); /* * pg_parse_json_or_ereport * * This function is like pg_parse_json, except that it does not return a * JsonParseErrorType. Instead, in case of any failure, this function will * ereport(ERROR). */ void pg_parse_json_or_ereport(JsonLexContext *lex, JsonSemAction *sem) { JsonParseErrorType result; result = pg_parse_json(lex, sem); if (result != JSON_SUCCESS) json_ereport_error(result, lex); } /* * makeJsonLexContext * * This is like makeJsonLexContextCstringLen, but it accepts a text value * directly. */ JsonLexContext * makeJsonLexContext(text *json, bool need_escapes) { return makeJsonLexContextCstringLen(VARDATA_ANY(json), VARSIZE_ANY_EXHDR(json), GetDatabaseEncoding(), need_escapes); } /* * SQL function json_object_keys * * Returns the set of keys for the object argument. * * This SRF operates in value-per-call mode. It processes the * object during the first call, and the keys are simply stashed * in an array, whose size is expanded as necessary. This is probably * safe enough for a list of keys of a single object, since they are * limited in size to NAMEDATALEN and the number of keys is unlikely to * be so huge that it has major memory implications. */ Datum jsonb_object_keys(PG_FUNCTION_ARGS) { FuncCallContext *funcctx; OkeysState *state; if (SRF_IS_FIRSTCALL()) { MemoryContext oldcontext; Jsonb *jb = PG_GETARG_JSONB_P(0); bool skipNested = false; JsonbIterator *it; JsonbValue v; JsonbIteratorToken r; if (JB_ROOT_IS_SCALAR(jb)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot call %s on a scalar", "jsonb_object_keys"))); else if (JB_ROOT_IS_ARRAY(jb)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot call %s on an array", "jsonb_object_keys"))); funcctx = SRF_FIRSTCALL_INIT(); oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx); state = palloc(sizeof(OkeysState)); state->result_size = JB_ROOT_COUNT(jb); state->result_count = 0; state->sent_count = 0; state->result = palloc(state->result_size * sizeof(char *)); it = JsonbIteratorInit(&jb->root); while ((r = JsonbIteratorNext(&it, &v, skipNested)) != WJB_DONE) { skipNested = true; if (r == WJB_KEY) { char *cstr; cstr = palloc(v.val.string.len + 1 * sizeof(char)); memcpy(cstr, v.val.string.val, v.val.string.len); cstr[v.val.string.len] = '\0'; state->result[state->result_count++] = cstr; } } MemoryContextSwitchTo(oldcontext); funcctx->user_fctx = (void *) state; } funcctx = SRF_PERCALL_SETUP(); state = (OkeysState *) funcctx->user_fctx; if (state->sent_count < state->result_count) { char *nxt = state->result[state->sent_count++]; SRF_RETURN_NEXT(funcctx, CStringGetTextDatum(nxt)); } SRF_RETURN_DONE(funcctx); } /* * Report a JSON error. */ void json_ereport_error(JsonParseErrorType error, JsonLexContext *lex) { if (error == JSON_UNICODE_HIGH_ESCAPE || error == JSON_UNICODE_CODE_POINT_ZERO) ereport(ERROR, (errcode(ERRCODE_UNTRANSLATABLE_CHARACTER), errmsg("unsupported Unicode escape sequence"), errdetail("%s", json_errdetail(error, lex)), report_json_context(lex))); else ereport(ERROR, (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION), errmsg("invalid input syntax for type %s", "json"), errdetail("%s", json_errdetail(error, lex)), report_json_context(lex))); } /* * Report a CONTEXT line for bogus JSON input. * * lex->token_terminator must be set to identify the spot where we detected * the error. Note that lex->token_start might be NULL, in case we recognized * error at EOF. * * The return value isn't meaningful, but we make it non-void so that this * can be invoked inside ereport(). */ static int report_json_context(JsonLexContext *lex) { const char *context_start; const char *context_end; const char *line_start; char *ctxt; int ctxtlen; const char *prefix; const char *suffix; /* Choose boundaries for the part of the input we will display */ line_start = lex->line_start; context_start = line_start; context_end = lex->token_terminator; /* Advance until we are close enough to context_end */ while (context_end - context_start >= 50) { /* Advance to next multibyte character */ if (IS_HIGHBIT_SET(*context_start)) context_start += pg_mblen(context_start); else context_start++; } /* * We add "..." to indicate that the excerpt doesn't start at the * beginning of the line ... but if we're within 3 characters of the * beginning of the line, we might as well just show the whole line. */ if (context_start - line_start <= 3) context_start = line_start; /* Get a null-terminated copy of the data to present */ ctxtlen = context_end - context_start; ctxt = palloc(ctxtlen + 1); memcpy(ctxt, context_start, ctxtlen); ctxt[ctxtlen] = '\0'; /* * Show the context, prefixing "..." if not starting at start of line, and * suffixing "..." if not ending at end of line. */ prefix = (context_start > line_start) ? "..." : ""; suffix = (lex->token_type != JSON_TOKEN_END && context_end - lex->input < lex->input_length && *context_end != '\n' && *context_end != '\r') ? "..." : ""; return errcontext("JSON data, line %d: %s%s%s", lex->line_number, prefix, ctxt, suffix); } Datum json_object_keys(PG_FUNCTION_ARGS) { FuncCallContext *funcctx; OkeysState *state; if (SRF_IS_FIRSTCALL()) { text *json = PG_GETARG_TEXT_PP(0); JsonLexContext *lex = makeJsonLexContext(json, true); JsonSemAction *sem; MemoryContext oldcontext; funcctx = SRF_FIRSTCALL_INIT(); oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx); state = palloc(sizeof(OkeysState)); sem = palloc0(sizeof(JsonSemAction)); state->lex = lex; state->result_size = 256; state->result_count = 0; state->sent_count = 0; state->result = palloc(256 * sizeof(char *)); sem->semstate = (void *) state; sem->array_start = okeys_array_start; sem->scalar = okeys_scalar; sem->object_field_start = okeys_object_field_start; /* remainder are all NULL, courtesy of palloc0 above */ pg_parse_json_or_ereport(lex, sem); /* keys are now in state->result */ pfree(lex->strval->data); pfree(lex->strval); pfree(lex); pfree(sem); MemoryContextSwitchTo(oldcontext); funcctx->user_fctx = (void *) state; } funcctx = SRF_PERCALL_SETUP(); state = (OkeysState *) funcctx->user_fctx; if (state->sent_count < state->result_count) { char *nxt = state->result[state->sent_count++]; SRF_RETURN_NEXT(funcctx, CStringGetTextDatum(nxt)); } SRF_RETURN_DONE(funcctx); } static void okeys_object_field_start(void *state, char *fname, bool isnull) { OkeysState *_state = (OkeysState *) state; /* only collecting keys for the top level object */ if (_state->lex->lex_level != 1) return; /* enlarge result array if necessary */ if (_state->result_count >= _state->result_size) { _state->result_size *= 2; _state->result = (char **) repalloc(_state->result, sizeof(char *) * _state->result_size); } /* save a copy of the field name */ _state->result[_state->result_count++] = pstrdup(fname); } static void okeys_array_start(void *state) { OkeysState *_state = (OkeysState *) state; /* top level must be a json object */ if (_state->lex->lex_level == 0) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot call %s on an array", "json_object_keys"))); } static void okeys_scalar(void *state, char *token, JsonTokenType tokentype) { OkeysState *_state = (OkeysState *) state; /* top level must be a json object */ if (_state->lex->lex_level == 0) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot call %s on a scalar", "json_object_keys"))); } /* * json and jsonb getter functions * these implement the -> ->> #> and #>> operators * and the json{b?}_extract_path*(json, text, ...) functions */ Datum json_object_field(PG_FUNCTION_ARGS) { text *json = PG_GETARG_TEXT_PP(0); text *fname = PG_GETARG_TEXT_PP(1); char *fnamestr = text_to_cstring(fname); text *result; result = get_worker(json, &fnamestr, NULL, 1, false); if (result != NULL) PG_RETURN_TEXT_P(result); else PG_RETURN_NULL(); } Datum jsonb_object_field(PG_FUNCTION_ARGS) { Jsonb *jb = PG_GETARG_JSONB_P(0); text *key = PG_GETARG_TEXT_PP(1); JsonbValue *v; JsonbValue vbuf; if (!JB_ROOT_IS_OBJECT(jb)) PG_RETURN_NULL(); v = getKeyJsonValueFromContainer(&jb->root, VARDATA_ANY(key), VARSIZE_ANY_EXHDR(key), &vbuf); if (v != NULL) PG_RETURN_JSONB_P(JsonbValueToJsonb(v)); PG_RETURN_NULL(); } Datum json_object_field_text(PG_FUNCTION_ARGS) { text *json = PG_GETARG_TEXT_PP(0); text *fname = PG_GETARG_TEXT_PP(1); char *fnamestr = text_to_cstring(fname); text *result; result = get_worker(json, &fnamestr, NULL, 1, true); if (result != NULL) PG_RETURN_TEXT_P(result); else PG_RETURN_NULL(); } Datum jsonb_object_field_text(PG_FUNCTION_ARGS) { Jsonb *jb = PG_GETARG_JSONB_P(0); text *key = PG_GETARG_TEXT_PP(1); JsonbValue *v; JsonbValue vbuf; if (!JB_ROOT_IS_OBJECT(jb)) PG_RETURN_NULL(); v = getKeyJsonValueFromContainer(&jb->root, VARDATA_ANY(key), VARSIZE_ANY_EXHDR(key), &vbuf); if (v != NULL && v->type != jbvNull) PG_RETURN_TEXT_P(JsonbValueAsText(v)); PG_RETURN_NULL(); } Datum json_array_element(PG_FUNCTION_ARGS) { text *json = PG_GETARG_TEXT_PP(0); int element = PG_GETARG_INT32(1); text *result; result = get_worker(json, NULL, &element, 1, false); if (result != NULL) PG_RETURN_TEXT_P(result); else PG_RETURN_NULL(); } Datum jsonb_array_element(PG_FUNCTION_ARGS) { Jsonb *jb = PG_GETARG_JSONB_P(0); int element = PG_GETARG_INT32(1); JsonbValue *v; if (!JB_ROOT_IS_ARRAY(jb)) PG_RETURN_NULL(); /* Handle negative subscript */ if (element < 0) { uint32 nelements = JB_ROOT_COUNT(jb); if (-element > nelements) PG_RETURN_NULL(); else element += nelements; } v = getIthJsonbValueFromContainer(&jb->root, element); if (v != NULL) PG_RETURN_JSONB_P(JsonbValueToJsonb(v)); PG_RETURN_NULL(); } Datum json_array_element_text(PG_FUNCTION_ARGS) { text *json = PG_GETARG_TEXT_PP(0); int element = PG_GETARG_INT32(1); text *result; result = get_worker(json, NULL, &element, 1, true); if (result != NULL) PG_RETURN_TEXT_P(result); else PG_RETURN_NULL(); } Datum jsonb_array_element_text(PG_FUNCTION_ARGS) { Jsonb *jb = PG_GETARG_JSONB_P(0); int element = PG_GETARG_INT32(1); JsonbValue *v; if (!JB_ROOT_IS_ARRAY(jb)) PG_RETURN_NULL(); /* Handle negative subscript */ if (element < 0) { uint32 nelements = JB_ROOT_COUNT(jb); if (-element > nelements) PG_RETURN_NULL(); else element += nelements; } v = getIthJsonbValueFromContainer(&jb->root, element); if (v != NULL && v->type != jbvNull) PG_RETURN_TEXT_P(JsonbValueAsText(v)); PG_RETURN_NULL(); } Datum json_extract_path(PG_FUNCTION_ARGS) { return get_path_all(fcinfo, false); } Datum json_extract_path_text(PG_FUNCTION_ARGS) { return get_path_all(fcinfo, true); } /* * common routine for extract_path functions */ static Datum get_path_all(FunctionCallInfo fcinfo, bool as_text) { text *json = PG_GETARG_TEXT_PP(0); ArrayType *path = PG_GETARG_ARRAYTYPE_P(1); text *result; Datum *pathtext; bool *pathnulls; int npath; char **tpath; int *ipath; int i; /* * If the array contains any null elements, return NULL, on the grounds * that you'd have gotten NULL if any RHS value were NULL in a nested * series of applications of the -> operator. (Note: because we also * return NULL for error cases such as no-such-field, this is true * regardless of the contents of the rest of the array.) */ if (array_contains_nulls(path)) PG_RETURN_NULL(); deconstruct_array(path, TEXTOID, -1, false, TYPALIGN_INT, &pathtext, &pathnulls, &npath); tpath = palloc(npath * sizeof(char *)); ipath = palloc(npath * sizeof(int)); for (i = 0; i < npath; i++) { Assert(!pathnulls[i]); tpath[i] = TextDatumGetCString(pathtext[i]); /* * we have no idea at this stage what structure the document is so * just convert anything in the path that we can to an integer and set * all the other integers to INT_MIN which will never match. */ if (*tpath[i] != '\0') { int ind; char *endptr; errno = 0; ind = strtoint(tpath[i], &endptr, 10); if (endptr == tpath[i] || *endptr != '\0' || errno != 0) ipath[i] = INT_MIN; else ipath[i] = ind; } else ipath[i] = INT_MIN; } result = get_worker(json, tpath, ipath, npath, as_text); if (result != NULL) PG_RETURN_TEXT_P(result); else PG_RETURN_NULL(); } /* * get_worker * * common worker for all the json getter functions * * json: JSON object (in text form) * tpath[]: field name(s) to extract * ipath[]: array index(es) (zero-based) to extract, accepts negatives * npath: length of tpath[] and/or ipath[] * normalize_results: true to de-escape string and null scalars * * tpath can be NULL, or any one tpath[] entry can be NULL, if an object * field is not to be matched at that nesting level. Similarly, ipath can * be NULL, or any one ipath[] entry can be INT_MIN if an array element is * not to be matched at that nesting level (a json datum should never be * large enough to have -INT_MIN elements due to MaxAllocSize restriction). */ static text * get_worker(text *json, char **tpath, int *ipath, int npath, bool normalize_results) { JsonLexContext *lex = makeJsonLexContext(json, true); JsonSemAction *sem = palloc0(sizeof(JsonSemAction)); GetState *state = palloc0(sizeof(GetState)); Assert(npath >= 0); state->lex = lex; /* is it "_as_text" variant? */ state->normalize_results = normalize_results; state->npath = npath; state->path_names = tpath; state->path_indexes = ipath; state->pathok = palloc0(sizeof(bool) * npath); state->array_cur_index = palloc(sizeof(int) * npath); if (npath > 0) state->pathok[0] = true; sem->semstate = (void *) state; /* * Not all variants need all the semantic routines. Only set the ones that * are actually needed for maximum efficiency. */ sem->scalar = get_scalar; if (npath == 0) { sem->object_start = get_object_start; sem->object_end = get_object_end; sem->array_start = get_array_start; sem->array_end = get_array_end; } if (tpath != NULL) { sem->object_field_start = get_object_field_start; sem->object_field_end = get_object_field_end; } if (ipath != NULL) { sem->array_start = get_array_start; sem->array_element_start = get_array_element_start; sem->array_element_end = get_array_element_end; } pg_parse_json_or_ereport(lex, sem); return state->tresult; } static void get_object_start(void *state) { GetState *_state = (GetState *) state; int lex_level = _state->lex->lex_level; if (lex_level == 0 && _state->npath == 0) { /* * Special case: we should match the entire object. We only need this * at outermost level because at nested levels the match will have * been started by the outer field or array element callback. */ _state->result_start = _state->lex->token_start; } } static void get_object_end(void *state) { GetState *_state = (GetState *) state; int lex_level = _state->lex->lex_level; if (lex_level == 0 && _state->npath == 0) { /* Special case: return the entire object */ char *start = _state->result_start; int len = _state->lex->prev_token_terminator - start; _state->tresult = cstring_to_text_with_len(start, len); } } static void get_object_field_start(void *state, char *fname, bool isnull) { GetState *_state = (GetState *) state; bool get_next = false; int lex_level = _state->lex->lex_level; if (lex_level <= _state->npath && _state->pathok[lex_level - 1] && _state->path_names != NULL && _state->path_names[lex_level - 1] != NULL && strcmp(fname, _state->path_names[lex_level - 1]) == 0) { if (lex_level < _state->npath) { /* if not at end of path just mark path ok */ _state->pathok[lex_level] = true; } else { /* end of path, so we want this value */ get_next = true; } } if (get_next) { /* this object overrides any previous matching object */ _state->tresult = NULL; _state->result_start = NULL; if (_state->normalize_results && _state->lex->token_type == JSON_TOKEN_STRING) { /* for as_text variants, tell get_scalar to set it for us */ _state->next_scalar = true; } else { /* for non-as_text variants, just note the json starting point */ _state->result_start = _state->lex->token_start; } } } static void get_object_field_end(void *state, char *fname, bool isnull) { GetState *_state = (GetState *) state; bool get_last = false; int lex_level = _state->lex->lex_level; /* same tests as in get_object_field_start */ if (lex_level <= _state->npath && _state->pathok[lex_level - 1] && _state->path_names != NULL && _state->path_names[lex_level - 1] != NULL && strcmp(fname, _state->path_names[lex_level - 1]) == 0) { if (lex_level < _state->npath) { /* done with this field so reset pathok */ _state->pathok[lex_level] = false; } else { /* end of path, so we want this value */ get_last = true; } } /* for as_text scalar case, our work is already done */ if (get_last && _state->result_start != NULL) { /* * make a text object from the string from the previously noted json * start up to the end of the previous token (the lexer is by now * ahead of us on whatever came after what we're interested in). */ if (isnull && _state->normalize_results) _state->tresult = (text *) NULL; else { char *start = _state->result_start; int len = _state->lex->prev_token_terminator - start; _state->tresult = cstring_to_text_with_len(start, len); } /* this should be unnecessary but let's do it for cleanliness: */ _state->result_start = NULL; } } static void get_array_start(void *state) { GetState *_state = (GetState *) state; int lex_level = _state->lex->lex_level; if (lex_level < _state->npath) { /* Initialize counting of elements in this array */ _state->array_cur_index[lex_level] = -1; /* INT_MIN value is reserved to represent invalid subscript */ if (_state->path_indexes[lex_level] < 0 && _state->path_indexes[lex_level] != INT_MIN) { /* Negative subscript -- convert to positive-wise subscript */ JsonParseErrorType error; int nelements; error = json_count_array_elements(_state->lex, &nelements); if (error != JSON_SUCCESS) json_ereport_error(error, _state->lex); if (-_state->path_indexes[lex_level] <= nelements) _state->path_indexes[lex_level] += nelements; } } else if (lex_level == 0 && _state->npath == 0) { /* * Special case: we should match the entire array. We only need this * at the outermost level because at nested levels the match will have * been started by the outer field or array element callback. */ _state->result_start = _state->lex->token_start; } } static void get_array_end(void *state) { GetState *_state = (GetState *) state; int lex_level = _state->lex->lex_level; if (lex_level == 0 && _state->npath == 0) { /* Special case: return the entire array */ char *start = _state->result_start; int len = _state->lex->prev_token_terminator - start; _state->tresult = cstring_to_text_with_len(start, len); } } static void get_array_element_start(void *state, bool isnull) { GetState *_state = (GetState *) state; bool get_next = false; int lex_level = _state->lex->lex_level; /* Update array element counter */ if (lex_level <= _state->npath) _state->array_cur_index[lex_level - 1]++; if (lex_level <= _state->npath && _state->pathok[lex_level - 1] && _state->path_indexes != NULL && _state->array_cur_index[lex_level - 1] == _state->path_indexes[lex_level - 1]) { if (lex_level < _state->npath) { /* if not at end of path just mark path ok */ _state->pathok[lex_level] = true; } else { /* end of path, so we want this value */ get_next = true; } } /* same logic as for objects */ if (get_next) { _state->tresult = NULL; _state->result_start = NULL; if (_state->normalize_results && _state->lex->token_type == JSON_TOKEN_STRING) { _state->next_scalar = true; } else { _state->result_start = _state->lex->token_start; } } } static void get_array_element_end(void *state, bool isnull) { GetState *_state = (GetState *) state; bool get_last = false; int lex_level = _state->lex->lex_level; /* same tests as in get_array_element_start */ if (lex_level <= _state->npath && _state->pathok[lex_level - 1] && _state->path_indexes != NULL && _state->array_cur_index[lex_level - 1] == _state->path_indexes[lex_level - 1]) { if (lex_level < _state->npath) { /* done with this element so reset pathok */ _state->pathok[lex_level] = false; } else { /* end of path, so we want this value */ get_last = true; } } /* same logic as for objects */ if (get_last && _state->result_start != NULL) { if (isnull && _state->normalize_results) _state->tresult = (text *) NULL; else { char *start = _state->result_start; int len = _state->lex->prev_token_terminator - start; _state->tresult = cstring_to_text_with_len(start, len); } _state->result_start = NULL; } } static void get_scalar(void *state, char *token, JsonTokenType tokentype) { GetState *_state = (GetState *) state; int lex_level = _state->lex->lex_level; /* Check for whole-object match */ if (lex_level == 0 && _state->npath == 0) { if (_state->normalize_results && tokentype == JSON_TOKEN_STRING) { /* we want the de-escaped string */ _state->next_scalar = true; } else if (_state->normalize_results && tokentype == JSON_TOKEN_NULL) { _state->tresult = (text *) NULL; } else { /* * This is a bit hokey: we will suppress whitespace after the * scalar token, but not whitespace before it. Probably not worth * doing our own space-skipping to avoid that. */ char *start = _state->lex->input; int len = _state->lex->prev_token_terminator - start; _state->tresult = cstring_to_text_with_len(start, len); } } if (_state->next_scalar) { /* a de-escaped text value is wanted, so supply it */ _state->tresult = cstring_to_text(token); /* make sure the next call to get_scalar doesn't overwrite it */ _state->next_scalar = false; } } Datum jsonb_extract_path(PG_FUNCTION_ARGS) { return get_jsonb_path_all(fcinfo, false); } Datum jsonb_extract_path_text(PG_FUNCTION_ARGS) { return get_jsonb_path_all(fcinfo, true); } static Datum get_jsonb_path_all(FunctionCallInfo fcinfo, bool as_text) { Jsonb *jb = PG_GETARG_JSONB_P(0); ArrayType *path = PG_GETARG_ARRAYTYPE_P(1); Datum *pathtext; bool *pathnulls; bool isnull; int npath; Datum res; /* * If the array contains any null elements, return NULL, on the grounds * that you'd have gotten NULL if any RHS value were NULL in a nested * series of applications of the -> operator. (Note: because we also * return NULL for error cases such as no-such-field, this is true * regardless of the contents of the rest of the array.) */ if (array_contains_nulls(path)) PG_RETURN_NULL(); deconstruct_array(path, TEXTOID, -1, false, TYPALIGN_INT, &pathtext, &pathnulls, &npath); res = jsonb_get_element(jb, pathtext, npath, &isnull, as_text); if (isnull) PG_RETURN_NULL(); else PG_RETURN_DATUM(res); } Datum jsonb_get_element(Jsonb *jb, Datum *path, int npath, bool *isnull, bool as_text) { JsonbContainer *container = &jb->root; JsonbValue *jbvp = NULL; int i; bool have_object = false, have_array = false; *isnull = false; /* Identify whether we have object, array, or scalar at top-level */ if (JB_ROOT_IS_OBJECT(jb)) have_object = true; else if (JB_ROOT_IS_ARRAY(jb) && !JB_ROOT_IS_SCALAR(jb)) have_array = true; else { Assert(JB_ROOT_IS_ARRAY(jb) && JB_ROOT_IS_SCALAR(jb)); /* Extract the scalar value, if it is what we'll return */ if (npath <= 0) jbvp = getIthJsonbValueFromContainer(container, 0); } /* * If the array is empty, return the entire LHS object, on the grounds * that we should do zero field or element extractions. For the * non-scalar case we can just hand back the object without much work. For * the scalar case, fall through and deal with the value below the loop. * (This inconsistency arises because there's no easy way to generate a * JsonbValue directly for root-level containers.) */ if (npath <= 0 && jbvp == NULL) { if (as_text) { return PointerGetDatum(cstring_to_text(JsonbToCString(NULL, container, VARSIZE(jb)))); } else { /* not text mode - just hand back the jsonb */ PG_RETURN_JSONB_P(jb); } } for (i = 0; i < npath; i++) { if (have_object) { jbvp = getKeyJsonValueFromContainer(container, VARDATA(path[i]), VARSIZE(path[i]) - VARHDRSZ, NULL); } else if (have_array) { int lindex; uint32 index; char *indextext = TextDatumGetCString(path[i]); char *endptr; errno = 0; lindex = strtoint(indextext, &endptr, 10); if (endptr == indextext || *endptr != '\0' || errno != 0) { *isnull = true; return PointerGetDatum(NULL); } if (lindex >= 0) { index = (uint32) lindex; } else { /* Handle negative subscript */ uint32 nelements; /* Container must be array, but make sure */ if (!JsonContainerIsArray(container)) elog(ERROR, "not a jsonb array"); nelements = JsonContainerSize(container); if (lindex == INT_MIN || -lindex > nelements) { *isnull = true; return PointerGetDatum(NULL); } else index = nelements + lindex; } jbvp = getIthJsonbValueFromContainer(container, index); } else { /* scalar, extraction yields a null */ *isnull = true; return PointerGetDatum(NULL); } if (jbvp == NULL) { *isnull = true; return PointerGetDatum(NULL); } else if (i == npath - 1) break; if (jbvp->type == jbvBinary) { container = jbvp->val.binary.data; have_object = JsonContainerIsObject(container); have_array = JsonContainerIsArray(container); Assert(!JsonContainerIsScalar(container)); } else { Assert(IsAJsonbScalar(jbvp)); have_object = false; have_array = false; } } if (as_text) { if (jbvp->type == jbvNull) { *isnull = true; return PointerGetDatum(NULL); } return PointerGetDatum(JsonbValueAsText(jbvp)); } else { Jsonb *res = JsonbValueToJsonb(jbvp); /* not text mode - just hand back the jsonb */ PG_RETURN_JSONB_P(res); } } Datum jsonb_set_element(Jsonb *jb, Datum *path, int path_len, JsonbValue *newval) { JsonbValue *res; JsonbParseState *state = NULL; JsonbIterator *it; bool *path_nulls = palloc0(path_len * sizeof(bool)); if (newval->type == jbvArray && newval->val.array.rawScalar) *newval = newval->val.array.elems[0]; it = JsonbIteratorInit(&jb->root); res = setPath(&it, path, path_nulls, path_len, &state, 0, newval, JB_PATH_CREATE | JB_PATH_FILL_GAPS | JB_PATH_CONSISTENT_POSITION); pfree(path_nulls); PG_RETURN_JSONB_P(JsonbValueToJsonb(res)); } static void push_null_elements(JsonbParseState **ps, int num) { JsonbValue null; null.type = jbvNull; while (num-- > 0) pushJsonbValue(ps, WJB_ELEM, &null); } /* * Prepare a new structure containing nested empty objects and arrays * corresponding to the specified path, and assign a new value at the end of * this path. E.g. the path [a][0][b] with the new value 1 will produce the * structure {a: [{b: 1}]}. * * Caller is responsible to make sure such path does not exist yet. */ static void push_path(JsonbParseState **st, int level, Datum *path_elems, bool *path_nulls, int path_len, JsonbValue *newval) { /* * tpath contains expected type of an empty jsonb created at each level * higher or equal than the current one, either jbvObject or jbvArray. * Since it contains only information about path slice from level to the * end, the access index must be normalized by level. */ enum jbvType *tpath = palloc0((path_len - level) * sizeof(enum jbvType)); JsonbValue newkey; /* * Create first part of the chain with beginning tokens. For the current * level WJB_BEGIN_OBJECT/WJB_BEGIN_ARRAY was already created, so start * with the next one. */ for (int i = level + 1; i < path_len; i++) { char *c, *badp; int lindex; if (path_nulls[i]) break; /* * Try to convert to an integer to find out the expected type, object * or array. */ c = TextDatumGetCString(path_elems[i]); errno = 0; lindex = strtoint(c, &badp, 10); if (badp == c || *badp != '\0' || errno != 0) { /* text, an object is expected */ newkey.type = jbvString; newkey.val.string.len = VARSIZE_ANY_EXHDR(path_elems[i]); newkey.val.string.val = VARDATA_ANY(path_elems[i]); (void) pushJsonbValue(st, WJB_BEGIN_OBJECT, NULL); (void) pushJsonbValue(st, WJB_KEY, &newkey); tpath[i - level] = jbvObject; } else { /* integer, an array is expected */ (void) pushJsonbValue(st, WJB_BEGIN_ARRAY, NULL); push_null_elements(st, lindex); tpath[i - level] = jbvArray; } } /* Insert an actual value for either an object or array */ if (tpath[(path_len - level) - 1] == jbvArray) { (void) pushJsonbValue(st, WJB_ELEM, newval); } else (void) pushJsonbValue(st, WJB_VALUE, newval); /* * Close everything up to the last but one level. The last one will be * closed outside of this function. */ for (int i = path_len - 1; i > level; i--) { if (path_nulls[i]) break; if (tpath[i - level] == jbvObject) (void) pushJsonbValue(st, WJB_END_OBJECT, NULL); else (void) pushJsonbValue(st, WJB_END_ARRAY, NULL); } } /* * Return the text representation of the given JsonbValue. */ static text * JsonbValueAsText(JsonbValue *v) { switch (v->type) { case jbvNull: return NULL; case jbvBool: return v->val.boolean ? cstring_to_text_with_len("true", 4) : cstring_to_text_with_len("false", 5); case jbvString: return cstring_to_text_with_len(v->val.string.val, v->val.string.len); case jbvNumeric: { Datum cstr; cstr = DirectFunctionCall1(numeric_out, PointerGetDatum(v->val.numeric)); return cstring_to_text(DatumGetCString(cstr)); } case jbvBinary: { StringInfoData jtext; initStringInfo(&jtext); (void) JsonbToCString(&jtext, v->val.binary.data, v->val.binary.len); return cstring_to_text_with_len(jtext.data, jtext.len); } default: elog(ERROR, "unrecognized jsonb type: %d", (int) v->type); return NULL; } } /* * SQL function json_array_length(json) -> int */ Datum json_array_length(PG_FUNCTION_ARGS) { text *json = PG_GETARG_TEXT_PP(0); AlenState *state; JsonLexContext *lex; JsonSemAction *sem; lex = makeJsonLexContext(json, false); state = palloc0(sizeof(AlenState)); sem = palloc0(sizeof(JsonSemAction)); /* palloc0 does this for us */ #if 0 state->count = 0; #endif state->lex = lex; sem->semstate = (void *) state; sem->object_start = alen_object_start; sem->scalar = alen_scalar; sem->array_element_start = alen_array_element_start; pg_parse_json_or_ereport(lex, sem); PG_RETURN_INT32(state->count); } Datum jsonb_array_length(PG_FUNCTION_ARGS) { Jsonb *jb = PG_GETARG_JSONB_P(0); if (JB_ROOT_IS_SCALAR(jb)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot get array length of a scalar"))); else if (!JB_ROOT_IS_ARRAY(jb)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot get array length of a non-array"))); PG_RETURN_INT32(JB_ROOT_COUNT(jb)); } /* * These next two checks ensure that the json is an array (since it can't be * a scalar or an object). */ static void alen_object_start(void *state) { AlenState *_state = (AlenState *) state; /* json structure check */ if (_state->lex->lex_level == 0) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot get array length of a non-array"))); } static void alen_scalar(void *state, char *token, JsonTokenType tokentype) { AlenState *_state = (AlenState *) state; /* json structure check */ if (_state->lex->lex_level == 0) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot get array length of a scalar"))); } static void alen_array_element_start(void *state, bool isnull) { AlenState *_state = (AlenState *) state; /* just count up all the level 1 elements */ if (_state->lex->lex_level == 1) _state->count++; } /* * SQL function json_each and json_each_text * * decompose a json object into key value pairs. * * Unlike json_object_keys() these SRFs operate in materialize mode, * stashing results into a Tuplestore object as they go. * The construction of tuples is done using a temporary memory context * that is cleared out after each tuple is built. */ Datum json_each(PG_FUNCTION_ARGS) { return each_worker(fcinfo, false); } Datum jsonb_each(PG_FUNCTION_ARGS) { return each_worker_jsonb(fcinfo, "jsonb_each", false); } Datum json_each_text(PG_FUNCTION_ARGS) { return each_worker(fcinfo, true); } Datum jsonb_each_text(PG_FUNCTION_ARGS) { return each_worker_jsonb(fcinfo, "jsonb_each_text", true); } static Datum each_worker_jsonb(FunctionCallInfo fcinfo, const char *funcname, bool as_text) { Jsonb *jb = PG_GETARG_JSONB_P(0); ReturnSetInfo *rsi; Tuplestorestate *tuple_store; TupleDesc tupdesc; TupleDesc ret_tdesc; MemoryContext old_cxt, tmp_cxt; bool skipNested = false; JsonbIterator *it; JsonbValue v; JsonbIteratorToken r; if (!JB_ROOT_IS_OBJECT(jb)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot call %s on a non-object", funcname))); rsi = (ReturnSetInfo *) fcinfo->resultinfo; if (!rsi || !IsA(rsi, ReturnSetInfo) || (rsi->allowedModes & SFRM_Materialize) == 0 || rsi->expectedDesc == NULL) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("set-valued function called in context that " "cannot accept a set"))); rsi->returnMode = SFRM_Materialize; if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("function returning record called in context " "that cannot accept type record"))); old_cxt = MemoryContextSwitchTo(rsi->econtext->ecxt_per_query_memory); ret_tdesc = CreateTupleDescCopy(tupdesc); BlessTupleDesc(ret_tdesc); tuple_store = tuplestore_begin_heap(rsi->allowedModes & SFRM_Materialize_Random, false, work_mem); MemoryContextSwitchTo(old_cxt); tmp_cxt = AllocSetContextCreate(CurrentMemoryContext, "jsonb_each temporary cxt", ALLOCSET_DEFAULT_SIZES); it = JsonbIteratorInit(&jb->root); while ((r = JsonbIteratorNext(&it, &v, skipNested)) != WJB_DONE) { skipNested = true; if (r == WJB_KEY) { text *key; HeapTuple tuple; Datum values[2]; bool nulls[2] = {false, false}; /* Use the tmp context so we can clean up after each tuple is done */ old_cxt = MemoryContextSwitchTo(tmp_cxt); key = cstring_to_text_with_len(v.val.string.val, v.val.string.len); /* * The next thing the iterator fetches should be the value, no * matter what shape it is. */ r = JsonbIteratorNext(&it, &v, skipNested); Assert(r != WJB_DONE); values[0] = PointerGetDatum(key); if (as_text) { if (v.type == jbvNull) { /* a json null is an sql null in text mode */ nulls[1] = true; values[1] = (Datum) NULL; } else values[1] = PointerGetDatum(JsonbValueAsText(&v)); } else { /* Not in text mode, just return the Jsonb */ Jsonb *val = JsonbValueToJsonb(&v); values[1] = PointerGetDatum(val); } tuple = heap_form_tuple(ret_tdesc, values, nulls); tuplestore_puttuple(tuple_store, tuple); /* clean up and switch back */ MemoryContextSwitchTo(old_cxt); MemoryContextReset(tmp_cxt); } } MemoryContextDelete(tmp_cxt); rsi->setResult = tuple_store; rsi->setDesc = ret_tdesc; PG_RETURN_NULL(); } static Datum each_worker(FunctionCallInfo fcinfo, bool as_text) { text *json = PG_GETARG_TEXT_PP(0); JsonLexContext *lex; JsonSemAction *sem; ReturnSetInfo *rsi; MemoryContext old_cxt; TupleDesc tupdesc; EachState *state; lex = makeJsonLexContext(json, true); state = palloc0(sizeof(EachState)); sem = palloc0(sizeof(JsonSemAction)); rsi = (ReturnSetInfo *) fcinfo->resultinfo; if (!rsi || !IsA(rsi, ReturnSetInfo) || (rsi->allowedModes & SFRM_Materialize) == 0 || rsi->expectedDesc == NULL) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("set-valued function called in context that " "cannot accept a set"))); rsi->returnMode = SFRM_Materialize; (void) get_call_result_type(fcinfo, NULL, &tupdesc); /* make these in a sufficiently long-lived memory context */ old_cxt = MemoryContextSwitchTo(rsi->econtext->ecxt_per_query_memory); state->ret_tdesc = CreateTupleDescCopy(tupdesc); BlessTupleDesc(state->ret_tdesc); state->tuple_store = tuplestore_begin_heap(rsi->allowedModes & SFRM_Materialize_Random, false, work_mem); MemoryContextSwitchTo(old_cxt); sem->semstate = (void *) state; sem->array_start = each_array_start; sem->scalar = each_scalar; sem->object_field_start = each_object_field_start; sem->object_field_end = each_object_field_end; state->normalize_results = as_text; state->next_scalar = false; state->lex = lex; state->tmp_cxt = AllocSetContextCreate(CurrentMemoryContext, "json_each temporary cxt", ALLOCSET_DEFAULT_SIZES); pg_parse_json_or_ereport(lex, sem); MemoryContextDelete(state->tmp_cxt); rsi->setResult = state->tuple_store; rsi->setDesc = state->ret_tdesc; PG_RETURN_NULL(); } static void each_object_field_start(void *state, char *fname, bool isnull) { EachState *_state = (EachState *) state; /* save a pointer to where the value starts */ if (_state->lex->lex_level == 1) { /* * next_scalar will be reset in the object_field_end handler, and * since we know the value is a scalar there is no danger of it being * on while recursing down the tree. */ if (_state->normalize_results && _state->lex->token_type == JSON_TOKEN_STRING) _state->next_scalar = true; else _state->result_start = _state->lex->token_start; } } static void each_object_field_end(void *state, char *fname, bool isnull) { EachState *_state = (EachState *) state; MemoryContext old_cxt; int len; text *val; HeapTuple tuple; Datum values[2]; bool nulls[2] = {false, false}; /* skip over nested objects */ if (_state->lex->lex_level != 1) return; /* use the tmp context so we can clean up after each tuple is done */ old_cxt = MemoryContextSwitchTo(_state->tmp_cxt); values[0] = CStringGetTextDatum(fname); if (isnull && _state->normalize_results) { nulls[1] = true; values[1] = (Datum) 0; } else if (_state->next_scalar) { values[1] = CStringGetTextDatum(_state->normalized_scalar); _state->next_scalar = false; } else { len = _state->lex->prev_token_terminator - _state->result_start; val = cstring_to_text_with_len(_state->result_start, len); values[1] = PointerGetDatum(val); } tuple = heap_form_tuple(_state->ret_tdesc, values, nulls); tuplestore_puttuple(_state->tuple_store, tuple); /* clean up and switch back */ MemoryContextSwitchTo(old_cxt); MemoryContextReset(_state->tmp_cxt); } static void each_array_start(void *state) { EachState *_state = (EachState *) state; /* json structure check */ if (_state->lex->lex_level == 0) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot deconstruct an array as an object"))); } static void each_scalar(void *state, char *token, JsonTokenType tokentype) { EachState *_state = (EachState *) state; /* json structure check */ if (_state->lex->lex_level == 0) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot deconstruct a scalar"))); /* supply de-escaped value if required */ if (_state->next_scalar) _state->normalized_scalar = token; } /* * SQL functions json_array_elements and json_array_elements_text * * get the elements from a json array * * a lot of this processing is similar to the json_each* functions */ Datum jsonb_array_elements(PG_FUNCTION_ARGS) { return elements_worker_jsonb(fcinfo, "jsonb_array_elements", false); } Datum jsonb_array_elements_text(PG_FUNCTION_ARGS) { return elements_worker_jsonb(fcinfo, "jsonb_array_elements_text", true); } static Datum elements_worker_jsonb(FunctionCallInfo fcinfo, const char *funcname, bool as_text) { Jsonb *jb = PG_GETARG_JSONB_P(0); ReturnSetInfo *rsi; Tuplestorestate *tuple_store; TupleDesc tupdesc; TupleDesc ret_tdesc; MemoryContext old_cxt, tmp_cxt; bool skipNested = false; JsonbIterator *it; JsonbValue v; JsonbIteratorToken r; if (JB_ROOT_IS_SCALAR(jb)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot extract elements from a scalar"))); else if (!JB_ROOT_IS_ARRAY(jb)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot extract elements from an object"))); rsi = (ReturnSetInfo *) fcinfo->resultinfo; if (!rsi || !IsA(rsi, ReturnSetInfo) || (rsi->allowedModes & SFRM_Materialize) == 0 || rsi->expectedDesc == NULL) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("set-valued function called in context that " "cannot accept a set"))); rsi->returnMode = SFRM_Materialize; /* it's a simple type, so don't use get_call_result_type() */ tupdesc = rsi->expectedDesc; old_cxt = MemoryContextSwitchTo(rsi->econtext->ecxt_per_query_memory); ret_tdesc = CreateTupleDescCopy(tupdesc); BlessTupleDesc(ret_tdesc); tuple_store = tuplestore_begin_heap(rsi->allowedModes & SFRM_Materialize_Random, false, work_mem); MemoryContextSwitchTo(old_cxt); tmp_cxt = AllocSetContextCreate(CurrentMemoryContext, "jsonb_array_elements temporary cxt", ALLOCSET_DEFAULT_SIZES); it = JsonbIteratorInit(&jb->root); while ((r = JsonbIteratorNext(&it, &v, skipNested)) != WJB_DONE) { skipNested = true; if (r == WJB_ELEM) { HeapTuple tuple; Datum values[1]; bool nulls[1] = {false}; /* use the tmp context so we can clean up after each tuple is done */ old_cxt = MemoryContextSwitchTo(tmp_cxt); if (as_text) { if (v.type == jbvNull) { /* a json null is an sql null in text mode */ nulls[0] = true; values[0] = (Datum) NULL; } else values[0] = PointerGetDatum(JsonbValueAsText(&v)); } else { /* Not in text mode, just return the Jsonb */ Jsonb *val = JsonbValueToJsonb(&v); values[0] = PointerGetDatum(val); } tuple = heap_form_tuple(ret_tdesc, values, nulls); tuplestore_puttuple(tuple_store, tuple); /* clean up and switch back */ MemoryContextSwitchTo(old_cxt); MemoryContextReset(tmp_cxt); } } MemoryContextDelete(tmp_cxt); rsi->setResult = tuple_store; rsi->setDesc = ret_tdesc; PG_RETURN_NULL(); } Datum json_array_elements(PG_FUNCTION_ARGS) { return elements_worker(fcinfo, "json_array_elements", false); } Datum json_array_elements_text(PG_FUNCTION_ARGS) { return elements_worker(fcinfo, "json_array_elements_text", true); } static Datum elements_worker(FunctionCallInfo fcinfo, const char *funcname, bool as_text) { text *json = PG_GETARG_TEXT_PP(0); /* elements only needs escaped strings when as_text */ JsonLexContext *lex = makeJsonLexContext(json, as_text); JsonSemAction *sem; ReturnSetInfo *rsi; MemoryContext old_cxt; TupleDesc tupdesc; ElementsState *state; state = palloc0(sizeof(ElementsState)); sem = palloc0(sizeof(JsonSemAction)); rsi = (ReturnSetInfo *) fcinfo->resultinfo; if (!rsi || !IsA(rsi, ReturnSetInfo) || (rsi->allowedModes & SFRM_Materialize) == 0 || rsi->expectedDesc == NULL) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("set-valued function called in context that " "cannot accept a set"))); rsi->returnMode = SFRM_Materialize; /* it's a simple type, so don't use get_call_result_type() */ tupdesc = rsi->expectedDesc; /* make these in a sufficiently long-lived memory context */ old_cxt = MemoryContextSwitchTo(rsi->econtext->ecxt_per_query_memory); state->ret_tdesc = CreateTupleDescCopy(tupdesc); BlessTupleDesc(state->ret_tdesc); state->tuple_store = tuplestore_begin_heap(rsi->allowedModes & SFRM_Materialize_Random, false, work_mem); MemoryContextSwitchTo(old_cxt); sem->semstate = (void *) state; sem->object_start = elements_object_start; sem->scalar = elements_scalar; sem->array_element_start = elements_array_element_start; sem->array_element_end = elements_array_element_end; state->function_name = funcname; state->normalize_results = as_text; state->next_scalar = false; state->lex = lex; state->tmp_cxt = AllocSetContextCreate(CurrentMemoryContext, "json_array_elements temporary cxt", ALLOCSET_DEFAULT_SIZES); pg_parse_json_or_ereport(lex, sem); MemoryContextDelete(state->tmp_cxt); rsi->setResult = state->tuple_store; rsi->setDesc = state->ret_tdesc; PG_RETURN_NULL(); } static void elements_array_element_start(void *state, bool isnull) { ElementsState *_state = (ElementsState *) state; /* save a pointer to where the value starts */ if (_state->lex->lex_level == 1) { /* * next_scalar will be reset in the array_element_end handler, and * since we know the value is a scalar there is no danger of it being * on while recursing down the tree. */ if (_state->normalize_results && _state->lex->token_type == JSON_TOKEN_STRING) _state->next_scalar = true; else _state->result_start = _state->lex->token_start; } } static void elements_array_element_end(void *state, bool isnull) { ElementsState *_state = (ElementsState *) state; MemoryContext old_cxt; int len; text *val; HeapTuple tuple; Datum values[1]; bool nulls[1] = {false}; /* skip over nested objects */ if (_state->lex->lex_level != 1) return; /* use the tmp context so we can clean up after each tuple is done */ old_cxt = MemoryContextSwitchTo(_state->tmp_cxt); if (isnull && _state->normalize_results) { nulls[0] = true; values[0] = (Datum) NULL; } else if (_state->next_scalar) { values[0] = CStringGetTextDatum(_state->normalized_scalar); _state->next_scalar = false; } else { len = _state->lex->prev_token_terminator - _state->result_start; val = cstring_to_text_with_len(_state->result_start, len); values[0] = PointerGetDatum(val); } tuple = heap_form_tuple(_state->ret_tdesc, values, nulls); tuplestore_puttuple(_state->tuple_store, tuple); /* clean up and switch back */ MemoryContextSwitchTo(old_cxt); MemoryContextReset(_state->tmp_cxt); } static void elements_object_start(void *state) { ElementsState *_state = (ElementsState *) state; /* json structure check */ if (_state->lex->lex_level == 0) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot call %s on a non-array", _state->function_name))); } static void elements_scalar(void *state, char *token, JsonTokenType tokentype) { ElementsState *_state = (ElementsState *) state; /* json structure check */ if (_state->lex->lex_level == 0) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot call %s on a scalar", _state->function_name))); /* supply de-escaped value if required */ if (_state->next_scalar) _state->normalized_scalar = token; } /* * SQL function json_populate_record * * set fields in a record from the argument json * * Code adapted shamelessly from hstore's populate_record * which is in turn partly adapted from record_out. * * The json is decomposed into a hash table, in which each * field in the record is then looked up by name. For jsonb * we fetch the values direct from the object. */ Datum jsonb_populate_record(PG_FUNCTION_ARGS) { return populate_record_worker(fcinfo, "jsonb_populate_record", false, true); } Datum jsonb_to_record(PG_FUNCTION_ARGS) { return populate_record_worker(fcinfo, "jsonb_to_record", false, false); } Datum json_populate_record(PG_FUNCTION_ARGS) { return populate_record_worker(fcinfo, "json_populate_record", true, true); } Datum json_to_record(PG_FUNCTION_ARGS) { return populate_record_worker(fcinfo, "json_to_record", true, false); } /* helper function for diagnostics */ static void populate_array_report_expected_array(PopulateArrayContext *ctx, int ndim) { if (ndim <= 0) { if (ctx->colname) ereport(ERROR, (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION), errmsg("expected JSON array"), errhint("See the value of key \"%s\".", ctx->colname))); else ereport(ERROR, (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION), errmsg("expected JSON array"))); } else { StringInfoData indices; int i; initStringInfo(&indices); Assert(ctx->ndims > 0 && ndim < ctx->ndims); for (i = 0; i < ndim; i++) appendStringInfo(&indices, "[%d]", ctx->sizes[i]); if (ctx->colname) ereport(ERROR, (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION), errmsg("expected JSON array"), errhint("See the array element %s of key \"%s\".", indices.data, ctx->colname))); else ereport(ERROR, (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION), errmsg("expected JSON array"), errhint("See the array element %s.", indices.data))); } } /* set the number of dimensions of the populated array when it becomes known */ static void populate_array_assign_ndims(PopulateArrayContext *ctx, int ndims) { int i; Assert(ctx->ndims <= 0); if (ndims <= 0) populate_array_report_expected_array(ctx, ndims); ctx->ndims = ndims; ctx->dims = palloc(sizeof(int) * ndims); ctx->sizes = palloc0(sizeof(int) * ndims); for (i = 0; i < ndims; i++) ctx->dims[i] = -1; /* dimensions are unknown yet */ } /* check the populated subarray dimension */ static void populate_array_check_dimension(PopulateArrayContext *ctx, int ndim) { int dim = ctx->sizes[ndim]; /* current dimension counter */ if (ctx->dims[ndim] == -1) ctx->dims[ndim] = dim; /* assign dimension if not yet known */ else if (ctx->dims[ndim] != dim) ereport(ERROR, (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION), errmsg("malformed JSON array"), errdetail("Multidimensional arrays must have " "sub-arrays with matching dimensions."))); /* reset the current array dimension size counter */ ctx->sizes[ndim] = 0; /* increment the parent dimension counter if it is a nested sub-array */ if (ndim > 0) ctx->sizes[ndim - 1]++; } static void populate_array_element(PopulateArrayContext *ctx, int ndim, JsValue *jsv) { Datum element; bool element_isnull; /* populate the array element */ element = populate_record_field(ctx->aio->element_info, ctx->aio->element_type, ctx->aio->element_typmod, NULL, ctx->mcxt, PointerGetDatum(NULL), jsv, &element_isnull); accumArrayResult(ctx->astate, element, element_isnull, ctx->aio->element_type, ctx->acxt); Assert(ndim > 0); ctx->sizes[ndim - 1]++; /* increment current dimension counter */ } /* json object start handler for populate_array_json() */ static void populate_array_object_start(void *_state) { PopulateArrayState *state = (PopulateArrayState *) _state; int ndim = state->lex->lex_level; if (state->ctx->ndims <= 0) populate_array_assign_ndims(state->ctx, ndim); else if (ndim < state->ctx->ndims) populate_array_report_expected_array(state->ctx, ndim); } /* json array end handler for populate_array_json() */ static void populate_array_array_end(void *_state) { PopulateArrayState *state = (PopulateArrayState *) _state; PopulateArrayContext *ctx = state->ctx; int ndim = state->lex->lex_level; if (ctx->ndims <= 0) populate_array_assign_ndims(ctx, ndim + 1); if (ndim < ctx->ndims) populate_array_check_dimension(ctx, ndim); } /* json array element start handler for populate_array_json() */ static void populate_array_element_start(void *_state, bool isnull) { PopulateArrayState *state = (PopulateArrayState *) _state; int ndim = state->lex->lex_level; if (state->ctx->ndims <= 0 || ndim == state->ctx->ndims) { /* remember current array element start */ state->element_start = state->lex->token_start; state->element_type = state->lex->token_type; state->element_scalar = NULL; } } /* json array element end handler for populate_array_json() */ static void populate_array_element_end(void *_state, bool isnull) { PopulateArrayState *state = (PopulateArrayState *) _state; PopulateArrayContext *ctx = state->ctx; int ndim = state->lex->lex_level; Assert(ctx->ndims > 0); if (ndim == ctx->ndims) { JsValue jsv; jsv.is_json = true; jsv.val.json.type = state->element_type; if (isnull) { Assert(jsv.val.json.type == JSON_TOKEN_NULL); jsv.val.json.str = NULL; jsv.val.json.len = 0; } else if (state->element_scalar) { jsv.val.json.str = state->element_scalar; jsv.val.json.len = -1; /* null-terminated */ } else { jsv.val.json.str = state->element_start; jsv.val.json.len = (state->lex->prev_token_terminator - state->element_start) * sizeof(char); } populate_array_element(ctx, ndim, &jsv); } } /* json scalar handler for populate_array_json() */ static void populate_array_scalar(void *_state, char *token, JsonTokenType tokentype) { PopulateArrayState *state = (PopulateArrayState *) _state; PopulateArrayContext *ctx = state->ctx; int ndim = state->lex->lex_level; if (ctx->ndims <= 0) populate_array_assign_ndims(ctx, ndim); else if (ndim < ctx->ndims) populate_array_report_expected_array(ctx, ndim); if (ndim == ctx->ndims) { /* remember the scalar element token */ state->element_scalar = token; /* element_type must already be set in populate_array_element_start() */ Assert(state->element_type == tokentype); } } /* parse a json array and populate array */ static void populate_array_json(PopulateArrayContext *ctx, char *json, int len) { PopulateArrayState state; JsonSemAction sem; state.lex = makeJsonLexContextCstringLen(json, len, GetDatabaseEncoding(), true); state.ctx = ctx; memset(&sem, 0, sizeof(sem)); sem.semstate = (void *) &state; sem.object_start = populate_array_object_start; sem.array_end = populate_array_array_end; sem.array_element_start = populate_array_element_start; sem.array_element_end = populate_array_element_end; sem.scalar = populate_array_scalar; pg_parse_json_or_ereport(state.lex, &sem); /* number of dimensions should be already known */ Assert(ctx->ndims > 0 && ctx->dims); pfree(state.lex); } /* * populate_array_dim_jsonb() -- Iterate recursively through jsonb sub-array * elements and accumulate result using given ArrayBuildState. */ static void populate_array_dim_jsonb(PopulateArrayContext *ctx, /* context */ JsonbValue *jbv, /* jsonb sub-array */ int ndim) /* current dimension */ { JsonbContainer *jbc = jbv->val.binary.data; JsonbIterator *it; JsonbIteratorToken tok; JsonbValue val; JsValue jsv; check_stack_depth(); if (jbv->type != jbvBinary || !JsonContainerIsArray(jbc)) populate_array_report_expected_array(ctx, ndim - 1); Assert(!JsonContainerIsScalar(jbc)); it = JsonbIteratorInit(jbc); tok = JsonbIteratorNext(&it, &val, true); Assert(tok == WJB_BEGIN_ARRAY); tok = JsonbIteratorNext(&it, &val, true); /* * If the number of dimensions is not yet known and we have found end of * the array, or the first child element is not an array, then assign the * number of dimensions now. */ if (ctx->ndims <= 0 && (tok == WJB_END_ARRAY || (tok == WJB_ELEM && (val.type != jbvBinary || !JsonContainerIsArray(val.val.binary.data))))) populate_array_assign_ndims(ctx, ndim); jsv.is_json = false; jsv.val.jsonb = &val; /* process all the array elements */ while (tok == WJB_ELEM) { /* * Recurse only if the dimensions of dimensions is still unknown or if * it is not the innermost dimension. */ if (ctx->ndims > 0 && ndim >= ctx->ndims) populate_array_element(ctx, ndim, &jsv); else { /* populate child sub-array */ populate_array_dim_jsonb(ctx, &val, ndim + 1); /* number of dimensions should be already known */ Assert(ctx->ndims > 0 && ctx->dims); populate_array_check_dimension(ctx, ndim); } tok = JsonbIteratorNext(&it, &val, true); } Assert(tok == WJB_END_ARRAY); /* free iterator, iterating until WJB_DONE */ tok = JsonbIteratorNext(&it, &val, true); Assert(tok == WJB_DONE && !it); } /* recursively populate an array from json/jsonb */ static Datum populate_array(ArrayIOData *aio, const char *colname, MemoryContext mcxt, JsValue *jsv) { PopulateArrayContext ctx; Datum result; int *lbs; int i; ctx.aio = aio; ctx.mcxt = mcxt; ctx.acxt = CurrentMemoryContext; ctx.astate = initArrayResult(aio->element_type, ctx.acxt, true); ctx.colname = colname; ctx.ndims = 0; /* unknown yet */ ctx.dims = NULL; ctx.sizes = NULL; if (jsv->is_json) populate_array_json(&ctx, jsv->val.json.str, jsv->val.json.len >= 0 ? jsv->val.json.len : strlen(jsv->val.json.str)); else { populate_array_dim_jsonb(&ctx, jsv->val.jsonb, 1); ctx.dims[0] = ctx.sizes[0]; } Assert(ctx.ndims > 0); lbs = palloc(sizeof(int) * ctx.ndims); for (i = 0; i < ctx.ndims; i++) lbs[i] = 1; result = makeMdArrayResult(ctx.astate, ctx.ndims, ctx.dims, lbs, ctx.acxt, true); pfree(ctx.dims); pfree(ctx.sizes); pfree(lbs); return result; } static void JsValueToJsObject(JsValue *jsv, JsObject *jso) { jso->is_json = jsv->is_json; if (jsv->is_json) { /* convert plain-text json into a hash table */ jso->val.json_hash = get_json_object_as_hash(jsv->val.json.str, jsv->val.json.len >= 0 ? jsv->val.json.len : strlen(jsv->val.json.str), "populate_composite"); } else { JsonbValue *jbv = jsv->val.jsonb; if (jbv->type == jbvBinary && JsonContainerIsObject(jbv->val.binary.data)) { jso->val.jsonb_cont = jbv->val.binary.data; } else { bool is_scalar; is_scalar = IsAJsonbScalar(jbv) || (jbv->type == jbvBinary && JsonContainerIsScalar(jbv->val.binary.data)); ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), is_scalar ? errmsg("cannot call %s on a scalar", "populate_composite") : errmsg("cannot call %s on an array", "populate_composite"))); } } } /* acquire or update cached tuple descriptor for a composite type */ static void update_cached_tupdesc(CompositeIOData *io, MemoryContext mcxt) { if (!io->tupdesc || io->tupdesc->tdtypeid != io->base_typid || io->tupdesc->tdtypmod != io->base_typmod) { TupleDesc tupdesc = lookup_rowtype_tupdesc(io->base_typid, io->base_typmod); MemoryContext oldcxt; if (io->tupdesc) FreeTupleDesc(io->tupdesc); /* copy tuple desc without constraints into cache memory context */ oldcxt = MemoryContextSwitchTo(mcxt); io->tupdesc = CreateTupleDescCopy(tupdesc); MemoryContextSwitchTo(oldcxt); ReleaseTupleDesc(tupdesc); } } /* recursively populate a composite (row type) value from json/jsonb */ static Datum populate_composite(CompositeIOData *io, Oid typid, const char *colname, MemoryContext mcxt, HeapTupleHeader defaultval, JsValue *jsv, bool isnull) { Datum result; /* acquire/update cached tuple descriptor */ update_cached_tupdesc(io, mcxt); if (isnull) result = (Datum) 0; else { HeapTupleHeader tuple; JsObject jso; /* prepare input value */ JsValueToJsObject(jsv, &jso); /* populate resulting record tuple */ tuple = populate_record(io->tupdesc, &io->record_io, defaultval, mcxt, &jso); result = HeapTupleHeaderGetDatum(tuple); JsObjectFree(&jso); } /* * If it's domain over composite, check domain constraints. (This should * probably get refactored so that we can see the TYPECAT value, but for * now, we can tell by comparing typid to base_typid.) */ if (typid != io->base_typid && typid != RECORDOID) domain_check(result, isnull, typid, &io->domain_info, mcxt); return result; } /* populate non-null scalar value from json/jsonb value */ static Datum populate_scalar(ScalarIOData *io, Oid typid, int32 typmod, JsValue *jsv) { Datum res; char *str = NULL; char *json = NULL; if (jsv->is_json) { int len = jsv->val.json.len; json = jsv->val.json.str; Assert(json); if (len >= 0) { /* Need to copy non-null-terminated string */ str = palloc(len + 1 * sizeof(char)); memcpy(str, json, len); str[len] = '\0'; } else str = json; /* string is already null-terminated */ /* If converting to json/jsonb, make string into valid JSON literal */ if ((typid == JSONOID || typid == JSONBOID) && jsv->val.json.type == JSON_TOKEN_STRING) { StringInfoData buf; initStringInfo(&buf); escape_json(&buf, str); /* free temporary buffer */ if (str != json) pfree(str); str = buf.data; } } else { JsonbValue *jbv = jsv->val.jsonb; if (typid == JSONBOID) { Jsonb *jsonb = JsonbValueToJsonb(jbv); /* directly use jsonb */ return JsonbPGetDatum(jsonb); } /* convert jsonb to string for typio call */ else if (typid == JSONOID && jbv->type != jbvBinary) { /* * Convert scalar jsonb (non-scalars are passed here as jbvBinary) * to json string, preserving quotes around top-level strings. */ Jsonb *jsonb = JsonbValueToJsonb(jbv); str = JsonbToCString(NULL, &jsonb->root, VARSIZE(jsonb)); } else if (jbv->type == jbvString) /* quotes are stripped */ str = pnstrdup(jbv->val.string.val, jbv->val.string.len); else if (jbv->type == jbvBool) str = pstrdup(jbv->val.boolean ? "true" : "false"); else if (jbv->type == jbvNumeric) str = DatumGetCString(DirectFunctionCall1(numeric_out, PointerGetDatum(jbv->val.numeric))); else if (jbv->type == jbvBinary) str = JsonbToCString(NULL, jbv->val.binary.data, jbv->val.binary.len); else elog(ERROR, "unrecognized jsonb type: %d", (int) jbv->type); } res = InputFunctionCall(&io->typiofunc, str, io->typioparam, typmod); /* free temporary buffer */ if (str != json) pfree(str); return res; } static Datum populate_domain(DomainIOData *io, Oid typid, const char *colname, MemoryContext mcxt, JsValue *jsv, bool isnull) { Datum res; if (isnull) res = (Datum) 0; else { res = populate_record_field(io->base_io, io->base_typid, io->base_typmod, colname, mcxt, PointerGetDatum(NULL), jsv, &isnull); Assert(!isnull); } domain_check(res, isnull, typid, &io->domain_info, mcxt); return res; } /* prepare column metadata cache for the given type */ static void prepare_column_cache(ColumnIOData *column, Oid typid, int32 typmod, MemoryContext mcxt, bool need_scalar) { HeapTuple tup; Form_pg_type type; column->typid = typid; column->typmod = typmod; tup = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid)); if (!HeapTupleIsValid(tup)) elog(ERROR, "cache lookup failed for type %u", typid); type = (Form_pg_type) GETSTRUCT(tup); if (type->typtype == TYPTYPE_DOMAIN) { /* * We can move directly to the bottom base type; domain_check() will * take care of checking all constraints for a stack of domains. */ Oid base_typid; int32 base_typmod = typmod; base_typid = getBaseTypeAndTypmod(typid, &base_typmod); if (get_typtype(base_typid) == TYPTYPE_COMPOSITE) { /* domain over composite has its own code path */ column->typcat = TYPECAT_COMPOSITE_DOMAIN; column->io.composite.record_io = NULL; column->io.composite.tupdesc = NULL; column->io.composite.base_typid = base_typid; column->io.composite.base_typmod = base_typmod; column->io.composite.domain_info = NULL; } else { /* domain over anything else */ column->typcat = TYPECAT_DOMAIN; column->io.domain.base_typid = base_typid; column->io.domain.base_typmod = base_typmod; column->io.domain.base_io = MemoryContextAllocZero(mcxt, sizeof(ColumnIOData)); column->io.domain.domain_info = NULL; } } else if (type->typtype == TYPTYPE_COMPOSITE || typid == RECORDOID) { column->typcat = TYPECAT_COMPOSITE; column->io.composite.record_io = NULL; column->io.composite.tupdesc = NULL; column->io.composite.base_typid = typid; column->io.composite.base_typmod = typmod; column->io.composite.domain_info = NULL; } else if (IsTrueArrayType(type)) { column->typcat = TYPECAT_ARRAY; column->io.array.element_info = MemoryContextAllocZero(mcxt, sizeof(ColumnIOData)); column->io.array.element_type = type->typelem; /* array element typemod stored in attribute's typmod */ column->io.array.element_typmod = typmod; } else { column->typcat = TYPECAT_SCALAR; need_scalar = true; } /* caller can force us to look up scalar_io info even for non-scalars */ if (need_scalar) { Oid typioproc; getTypeInputInfo(typid, &typioproc, &column->scalar_io.typioparam); fmgr_info_cxt(typioproc, &column->scalar_io.typiofunc, mcxt); } ReleaseSysCache(tup); } /* recursively populate a record field or an array element from a json/jsonb value */ static Datum populate_record_field(ColumnIOData *col, Oid typid, int32 typmod, const char *colname, MemoryContext mcxt, Datum defaultval, JsValue *jsv, bool *isnull) { TypeCat typcat; check_stack_depth(); /* * Prepare column metadata cache for the given type. Force lookup of the * scalar_io data so that the json string hack below will work. */ if (col->typid != typid || col->typmod != typmod) prepare_column_cache(col, typid, typmod, mcxt, true); *isnull = JsValueIsNull(jsv); typcat = col->typcat; /* try to convert json string to a non-scalar type through input function */ if (JsValueIsString(jsv) && (typcat == TYPECAT_ARRAY || typcat == TYPECAT_COMPOSITE || typcat == TYPECAT_COMPOSITE_DOMAIN)) typcat = TYPECAT_SCALAR; /* we must perform domain checks for NULLs, otherwise exit immediately */ if (*isnull && typcat != TYPECAT_DOMAIN && typcat != TYPECAT_COMPOSITE_DOMAIN) return (Datum) 0; switch (typcat) { case TYPECAT_SCALAR: return populate_scalar(&col->scalar_io, typid, typmod, jsv); case TYPECAT_ARRAY: return populate_array(&col->io.array, colname, mcxt, jsv); case TYPECAT_COMPOSITE: case TYPECAT_COMPOSITE_DOMAIN: return populate_composite(&col->io.composite, typid, colname, mcxt, DatumGetPointer(defaultval) ? DatumGetHeapTupleHeader(defaultval) : NULL, jsv, *isnull); case TYPECAT_DOMAIN: return populate_domain(&col->io.domain, typid, colname, mcxt, jsv, *isnull); default: elog(ERROR, "unrecognized type category '%c'", typcat); return (Datum) 0; } } static RecordIOData * allocate_record_info(MemoryContext mcxt, int ncolumns) { RecordIOData *data = (RecordIOData *) MemoryContextAlloc(mcxt, offsetof(RecordIOData, columns) + ncolumns * sizeof(ColumnIOData)); data->record_type = InvalidOid; data->record_typmod = 0; data->ncolumns = ncolumns; MemSet(data->columns, 0, sizeof(ColumnIOData) * ncolumns); return data; } static bool JsObjectGetField(JsObject *obj, char *field, JsValue *jsv) { jsv->is_json = obj->is_json; if (jsv->is_json) { JsonHashEntry *hashentry = hash_search(obj->val.json_hash, field, HASH_FIND, NULL); jsv->val.json.type = hashentry ? hashentry->type : JSON_TOKEN_NULL; jsv->val.json.str = jsv->val.json.type == JSON_TOKEN_NULL ? NULL : hashentry->val; jsv->val.json.len = jsv->val.json.str ? -1 : 0; /* null-terminated */ return hashentry != NULL; } else { jsv->val.jsonb = !obj->val.jsonb_cont ? NULL : getKeyJsonValueFromContainer(obj->val.jsonb_cont, field, strlen(field), NULL); return jsv->val.jsonb != NULL; } } /* populate a record tuple from json/jsonb value */ static HeapTupleHeader populate_record(TupleDesc tupdesc, RecordIOData **record_p, HeapTupleHeader defaultval, MemoryContext mcxt, JsObject *obj) { RecordIOData *record = *record_p; Datum *values; bool *nulls; HeapTuple res; int ncolumns = tupdesc->natts; int i; /* * if the input json is empty, we can only skip the rest if we were passed * in a non-null record, since otherwise there may be issues with domain * nulls. */ if (defaultval && JsObjectIsEmpty(obj)) return defaultval; /* (re)allocate metadata cache */ if (record == NULL || record->ncolumns != ncolumns) *record_p = record = allocate_record_info(mcxt, ncolumns); /* invalidate metadata cache if the record type has changed */ if (record->record_type != tupdesc->tdtypeid || record->record_typmod != tupdesc->tdtypmod) { MemSet(record, 0, offsetof(RecordIOData, columns) + ncolumns * sizeof(ColumnIOData)); record->record_type = tupdesc->tdtypeid; record->record_typmod = tupdesc->tdtypmod; record->ncolumns = ncolumns; } values = (Datum *) palloc(ncolumns * sizeof(Datum)); nulls = (bool *) palloc(ncolumns * sizeof(bool)); if (defaultval) { HeapTupleData tuple; /* Build a temporary HeapTuple control structure */ tuple.t_len = HeapTupleHeaderGetDatumLength(defaultval); ItemPointerSetInvalid(&(tuple.t_self)); tuple.t_tableOid = InvalidOid; tuple.t_data = defaultval; /* Break down the tuple into fields */ heap_deform_tuple(&tuple, tupdesc, values, nulls); } else { for (i = 0; i < ncolumns; ++i) { values[i] = (Datum) 0; nulls[i] = true; } } for (i = 0; i < ncolumns; ++i) { Form_pg_attribute att = TupleDescAttr(tupdesc, i); char *colname = NameStr(att->attname); JsValue field = {0}; bool found; /* Ignore dropped columns in datatype */ if (att->attisdropped) { nulls[i] = true; continue; } found = JsObjectGetField(obj, colname, &field); /* * we can't just skip here if the key wasn't found since we might have * a domain to deal with. If we were passed in a non-null record * datum, we assume that the existing values are valid (if they're * not, then it's not our fault), but if we were passed in a null, * then every field which we don't populate needs to be run through * the input function just in case it's a domain type. */ if (defaultval && !found) continue; values[i] = populate_record_field(&record->columns[i], att->atttypid, att->atttypmod, colname, mcxt, nulls[i] ? (Datum) 0 : values[i], &field, &nulls[i]); } res = heap_form_tuple(tupdesc, values, nulls); pfree(values); pfree(nulls); return res->t_data; } /* * Setup for json{b}_populate_record{set}: result type will be same as first * argument's type --- unless first argument is "null::record", which we can't * extract type info from; we handle that later. */ static void get_record_type_from_argument(FunctionCallInfo fcinfo, const char *funcname, PopulateRecordCache *cache) { cache->argtype = get_fn_expr_argtype(fcinfo->flinfo, 0); prepare_column_cache(&cache->c, cache->argtype, -1, cache->fn_mcxt, false); if (cache->c.typcat != TYPECAT_COMPOSITE && cache->c.typcat != TYPECAT_COMPOSITE_DOMAIN) ereport(ERROR, (errcode(ERRCODE_DATATYPE_MISMATCH), /* translator: %s is a function name, eg json_to_record */ errmsg("first argument of %s must be a row type", funcname))); } /* * Setup for json{b}_to_record{set}: result type is specified by calling * query. We'll also use this code for json{b}_populate_record{set}, * if we discover that the first argument is a null of type RECORD. * * Here it is syntactically impossible to specify the target type * as domain-over-composite. */ static void get_record_type_from_query(FunctionCallInfo fcinfo, const char *funcname, PopulateRecordCache *cache) { TupleDesc tupdesc; MemoryContext old_cxt; if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), /* translator: %s is a function name, eg json_to_record */ errmsg("could not determine row type for result of %s", funcname), errhint("Provide a non-null record argument, " "or call the function in the FROM clause " "using a column definition list."))); Assert(tupdesc); cache->argtype = tupdesc->tdtypeid; /* If we go through this more than once, avoid memory leak */ if (cache->c.io.composite.tupdesc) FreeTupleDesc(cache->c.io.composite.tupdesc); /* Save identified tupdesc */ old_cxt = MemoryContextSwitchTo(cache->fn_mcxt); cache->c.io.composite.tupdesc = CreateTupleDescCopy(tupdesc); cache->c.io.composite.base_typid = tupdesc->tdtypeid; cache->c.io.composite.base_typmod = tupdesc->tdtypmod; MemoryContextSwitchTo(old_cxt); } /* * common worker for json{b}_populate_record() and json{b}_to_record() * is_json and have_record_arg identify the specific function */ static Datum populate_record_worker(FunctionCallInfo fcinfo, const char *funcname, bool is_json, bool have_record_arg) { int json_arg_num = have_record_arg ? 1 : 0; JsValue jsv = {0}; HeapTupleHeader rec; Datum rettuple; JsonbValue jbv; MemoryContext fnmcxt = fcinfo->flinfo->fn_mcxt; PopulateRecordCache *cache = fcinfo->flinfo->fn_extra; /* * If first time through, identify input/result record type. Note that * this stanza looks only at fcinfo context, which can't change during the * query; so we may not be able to fully resolve a RECORD input type yet. */ if (!cache) { fcinfo->flinfo->fn_extra = cache = MemoryContextAllocZero(fnmcxt, sizeof(*cache)); cache->fn_mcxt = fnmcxt; if (have_record_arg) get_record_type_from_argument(fcinfo, funcname, cache); else get_record_type_from_query(fcinfo, funcname, cache); } /* Collect record arg if we have one */ if (!have_record_arg) rec = NULL; /* it's json{b}_to_record() */ else if (!PG_ARGISNULL(0)) { rec = PG_GETARG_HEAPTUPLEHEADER(0); /* * When declared arg type is RECORD, identify actual record type from * the tuple itself. */ if (cache->argtype == RECORDOID) { cache->c.io.composite.base_typid = HeapTupleHeaderGetTypeId(rec); cache->c.io.composite.base_typmod = HeapTupleHeaderGetTypMod(rec); } } else { rec = NULL; /* * When declared arg type is RECORD, identify actual record type from * calling query, or fail if we can't. */ if (cache->argtype == RECORDOID) { get_record_type_from_query(fcinfo, funcname, cache); /* This can't change argtype, which is important for next time */ Assert(cache->argtype == RECORDOID); } } /* If no JSON argument, just return the record (if any) unchanged */ if (PG_ARGISNULL(json_arg_num)) { if (rec) PG_RETURN_POINTER(rec); else PG_RETURN_NULL(); } jsv.is_json = is_json; if (is_json) { text *json = PG_GETARG_TEXT_PP(json_arg_num); jsv.val.json.str = VARDATA_ANY(json); jsv.val.json.len = VARSIZE_ANY_EXHDR(json); jsv.val.json.type = JSON_TOKEN_INVALID; /* not used in * populate_composite() */ } else { Jsonb *jb = PG_GETARG_JSONB_P(json_arg_num); jsv.val.jsonb = &jbv; /* fill binary jsonb value pointing to jb */ jbv.type = jbvBinary; jbv.val.binary.data = &jb->root; jbv.val.binary.len = VARSIZE(jb) - VARHDRSZ; } rettuple = populate_composite(&cache->c.io.composite, cache->argtype, NULL, fnmcxt, rec, &jsv, false); PG_RETURN_DATUM(rettuple); } /* * get_json_object_as_hash * * decompose a json object into a hash table. */ static HTAB * get_json_object_as_hash(char *json, int len, const char *funcname) { HASHCTL ctl; HTAB *tab; JHashState *state; JsonLexContext *lex = makeJsonLexContextCstringLen(json, len, GetDatabaseEncoding(), true); JsonSemAction *sem; ctl.keysize = NAMEDATALEN; ctl.entrysize = sizeof(JsonHashEntry); ctl.hcxt = CurrentMemoryContext; tab = hash_create("json object hashtable", 100, &ctl, HASH_ELEM | HASH_STRINGS | HASH_CONTEXT); state = palloc0(sizeof(JHashState)); sem = palloc0(sizeof(JsonSemAction)); state->function_name = funcname; state->hash = tab; state->lex = lex; sem->semstate = (void *) state; sem->array_start = hash_array_start; sem->scalar = hash_scalar; sem->object_field_start = hash_object_field_start; sem->object_field_end = hash_object_field_end; pg_parse_json_or_ereport(lex, sem); return tab; } static void hash_object_field_start(void *state, char *fname, bool isnull) { JHashState *_state = (JHashState *) state; if (_state->lex->lex_level > 1) return; /* remember token type */ _state->saved_token_type = _state->lex->token_type; if (_state->lex->token_type == JSON_TOKEN_ARRAY_START || _state->lex->token_type == JSON_TOKEN_OBJECT_START) { /* remember start position of the whole text of the subobject */ _state->save_json_start = _state->lex->token_start; } else { /* must be a scalar */ _state->save_json_start = NULL; } } static void hash_object_field_end(void *state, char *fname, bool isnull) { JHashState *_state = (JHashState *) state; JsonHashEntry *hashentry; bool found; /* * Ignore nested fields. */ if (_state->lex->lex_level > 1) return; /* * Ignore field names >= NAMEDATALEN - they can't match a record field. * (Note: without this test, the hash code would truncate the string at * NAMEDATALEN-1, and could then match against a similarly-truncated * record field name. That would be a reasonable behavior, but this code * has previously insisted on exact equality, so we keep this behavior.) */ if (strlen(fname) >= NAMEDATALEN) return; hashentry = hash_search(_state->hash, fname, HASH_ENTER, &found); /* * found being true indicates a duplicate. We don't do anything about * that, a later field with the same name overrides the earlier field. */ hashentry->type = _state->saved_token_type; Assert(isnull == (hashentry->type == JSON_TOKEN_NULL)); if (_state->save_json_start != NULL) { int len = _state->lex->prev_token_terminator - _state->save_json_start; char *val = palloc((len + 1) * sizeof(char)); memcpy(val, _state->save_json_start, len); val[len] = '\0'; hashentry->val = val; } else { /* must have had a scalar instead */ hashentry->val = _state->saved_scalar; } } static void hash_array_start(void *state) { JHashState *_state = (JHashState *) state; if (_state->lex->lex_level == 0) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot call %s on an array", _state->function_name))); } static void hash_scalar(void *state, char *token, JsonTokenType tokentype) { JHashState *_state = (JHashState *) state; if (_state->lex->lex_level == 0) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot call %s on a scalar", _state->function_name))); if (_state->lex->lex_level == 1) { _state->saved_scalar = token; /* saved_token_type must already be set in hash_object_field_start() */ Assert(_state->saved_token_type == tokentype); } } /* * SQL function json_populate_recordset * * set fields in a set of records from the argument json, * which must be an array of objects. * * similar to json_populate_record, but the tuple-building code * is pushed down into the semantic action handlers so it's done * per object in the array. */ Datum jsonb_populate_recordset(PG_FUNCTION_ARGS) { return populate_recordset_worker(fcinfo, "jsonb_populate_recordset", false, true); } Datum jsonb_to_recordset(PG_FUNCTION_ARGS) { return populate_recordset_worker(fcinfo, "jsonb_to_recordset", false, false); } Datum json_populate_recordset(PG_FUNCTION_ARGS) { return populate_recordset_worker(fcinfo, "json_populate_recordset", true, true); } Datum json_to_recordset(PG_FUNCTION_ARGS) { return populate_recordset_worker(fcinfo, "json_to_recordset", true, false); } static void populate_recordset_record(PopulateRecordsetState *state, JsObject *obj) { PopulateRecordCache *cache = state->cache; HeapTupleHeader tuphead; HeapTupleData tuple; /* acquire/update cached tuple descriptor */ update_cached_tupdesc(&cache->c.io.composite, cache->fn_mcxt); /* replace record fields from json */ tuphead = populate_record(cache->c.io.composite.tupdesc, &cache->c.io.composite.record_io, state->rec, cache->fn_mcxt, obj); /* if it's domain over composite, check domain constraints */ if (cache->c.typcat == TYPECAT_COMPOSITE_DOMAIN) domain_check(HeapTupleHeaderGetDatum(tuphead), false, cache->argtype, &cache->c.io.composite.domain_info, cache->fn_mcxt); /* ok, save into tuplestore */ tuple.t_len = HeapTupleHeaderGetDatumLength(tuphead); ItemPointerSetInvalid(&(tuple.t_self)); tuple.t_tableOid = InvalidOid; tuple.t_data = tuphead; tuplestore_puttuple(state->tuple_store, &tuple); } /* * common worker for json{b}_populate_recordset() and json{b}_to_recordset() * is_json and have_record_arg identify the specific function */ static Datum populate_recordset_worker(FunctionCallInfo fcinfo, const char *funcname, bool is_json, bool have_record_arg) { int json_arg_num = have_record_arg ? 1 : 0; ReturnSetInfo *rsi; MemoryContext old_cxt; HeapTupleHeader rec; PopulateRecordCache *cache = fcinfo->flinfo->fn_extra; PopulateRecordsetState *state; rsi = (ReturnSetInfo *) fcinfo->resultinfo; if (!rsi || !IsA(rsi, ReturnSetInfo) || (rsi->allowedModes & SFRM_Materialize) == 0) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("set-valued function called in context that " "cannot accept a set"))); rsi->returnMode = SFRM_Materialize; /* * If first time through, identify input/result record type. Note that * this stanza looks only at fcinfo context, which can't change during the * query; so we may not be able to fully resolve a RECORD input type yet. */ if (!cache) { fcinfo->flinfo->fn_extra = cache = MemoryContextAllocZero(fcinfo->flinfo->fn_mcxt, sizeof(*cache)); cache->fn_mcxt = fcinfo->flinfo->fn_mcxt; if (have_record_arg) get_record_type_from_argument(fcinfo, funcname, cache); else get_record_type_from_query(fcinfo, funcname, cache); } /* Collect record arg if we have one */ if (!have_record_arg) rec = NULL; /* it's json{b}_to_recordset() */ else if (!PG_ARGISNULL(0)) { rec = PG_GETARG_HEAPTUPLEHEADER(0); /* * When declared arg type is RECORD, identify actual record type from * the tuple itself. */ if (cache->argtype == RECORDOID) { cache->c.io.composite.base_typid = HeapTupleHeaderGetTypeId(rec); cache->c.io.composite.base_typmod = HeapTupleHeaderGetTypMod(rec); } } else { rec = NULL; /* * When declared arg type is RECORD, identify actual record type from * calling query, or fail if we can't. */ if (cache->argtype == RECORDOID) { get_record_type_from_query(fcinfo, funcname, cache); /* This can't change argtype, which is important for next time */ Assert(cache->argtype == RECORDOID); } } /* if the json is null send back an empty set */ if (PG_ARGISNULL(json_arg_num)) PG_RETURN_NULL(); /* * Forcibly update the cached tupdesc, to ensure we have the right tupdesc * to return even if the JSON contains no rows. */ update_cached_tupdesc(&cache->c.io.composite, cache->fn_mcxt); state = palloc0(sizeof(PopulateRecordsetState)); /* make tuplestore in a sufficiently long-lived memory context */ old_cxt = MemoryContextSwitchTo(rsi->econtext->ecxt_per_query_memory); state->tuple_store = tuplestore_begin_heap(rsi->allowedModes & SFRM_Materialize_Random, false, work_mem); MemoryContextSwitchTo(old_cxt); state->function_name = funcname; state->cache = cache; state->rec = rec; if (is_json) { text *json = PG_GETARG_TEXT_PP(json_arg_num); JsonLexContext *lex; JsonSemAction *sem; sem = palloc0(sizeof(JsonSemAction)); lex = makeJsonLexContext(json, true); sem->semstate = (void *) state; sem->array_start = populate_recordset_array_start; sem->array_element_start = populate_recordset_array_element_start; sem->scalar = populate_recordset_scalar; sem->object_field_start = populate_recordset_object_field_start; sem->object_field_end = populate_recordset_object_field_end; sem->object_start = populate_recordset_object_start; sem->object_end = populate_recordset_object_end; state->lex = lex; pg_parse_json_or_ereport(lex, sem); } else { Jsonb *jb = PG_GETARG_JSONB_P(json_arg_num); JsonbIterator *it; JsonbValue v; bool skipNested = false; JsonbIteratorToken r; if (JB_ROOT_IS_SCALAR(jb) || !JB_ROOT_IS_ARRAY(jb)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot call %s on a non-array", funcname))); it = JsonbIteratorInit(&jb->root); while ((r = JsonbIteratorNext(&it, &v, skipNested)) != WJB_DONE) { skipNested = true; if (r == WJB_ELEM) { JsObject obj; if (v.type != jbvBinary || !JsonContainerIsObject(v.val.binary.data)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("argument of %s must be an array of objects", funcname))); obj.is_json = false; obj.val.jsonb_cont = v.val.binary.data; populate_recordset_record(state, &obj); } } } /* * Note: we must copy the cached tupdesc because the executor will free * the passed-back setDesc, but we want to hang onto the cache in case * we're called again in the same query. */ rsi->setResult = state->tuple_store; rsi->setDesc = CreateTupleDescCopy(cache->c.io.composite.tupdesc); PG_RETURN_NULL(); } static void populate_recordset_object_start(void *state) { PopulateRecordsetState *_state = (PopulateRecordsetState *) state; int lex_level = _state->lex->lex_level; HASHCTL ctl; /* Reject object at top level: we must have an array at level 0 */ if (lex_level == 0) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot call %s on an object", _state->function_name))); /* Nested objects require no special processing */ if (lex_level > 1) return; /* Object at level 1: set up a new hash table for this object */ ctl.keysize = NAMEDATALEN; ctl.entrysize = sizeof(JsonHashEntry); ctl.hcxt = CurrentMemoryContext; _state->json_hash = hash_create("json object hashtable", 100, &ctl, HASH_ELEM | HASH_STRINGS | HASH_CONTEXT); } static void populate_recordset_object_end(void *state) { PopulateRecordsetState *_state = (PopulateRecordsetState *) state; JsObject obj; /* Nested objects require no special processing */ if (_state->lex->lex_level > 1) return; obj.is_json = true; obj.val.json_hash = _state->json_hash; /* Otherwise, construct and return a tuple based on this level-1 object */ populate_recordset_record(_state, &obj); /* Done with hash for this object */ hash_destroy(_state->json_hash); _state->json_hash = NULL; } static void populate_recordset_array_element_start(void *state, bool isnull) { PopulateRecordsetState *_state = (PopulateRecordsetState *) state; if (_state->lex->lex_level == 1 && _state->lex->token_type != JSON_TOKEN_OBJECT_START) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("argument of %s must be an array of objects", _state->function_name))); } static void populate_recordset_array_start(void *state) { /* nothing to do */ } static void populate_recordset_scalar(void *state, char *token, JsonTokenType tokentype) { PopulateRecordsetState *_state = (PopulateRecordsetState *) state; if (_state->lex->lex_level == 0) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot call %s on a scalar", _state->function_name))); if (_state->lex->lex_level == 2) _state->saved_scalar = token; } static void populate_recordset_object_field_start(void *state, char *fname, bool isnull) { PopulateRecordsetState *_state = (PopulateRecordsetState *) state; if (_state->lex->lex_level > 2) return; _state->saved_token_type = _state->lex->token_type; if (_state->lex->token_type == JSON_TOKEN_ARRAY_START || _state->lex->token_type == JSON_TOKEN_OBJECT_START) { _state->save_json_start = _state->lex->token_start; } else { _state->save_json_start = NULL; } } static void populate_recordset_object_field_end(void *state, char *fname, bool isnull) { PopulateRecordsetState *_state = (PopulateRecordsetState *) state; JsonHashEntry *hashentry; bool found; /* * Ignore nested fields. */ if (_state->lex->lex_level > 2) return; /* * Ignore field names >= NAMEDATALEN - they can't match a record field. * (Note: without this test, the hash code would truncate the string at * NAMEDATALEN-1, and could then match against a similarly-truncated * record field name. That would be a reasonable behavior, but this code * has previously insisted on exact equality, so we keep this behavior.) */ if (strlen(fname) >= NAMEDATALEN) return; hashentry = hash_search(_state->json_hash, fname, HASH_ENTER, &found); /* * found being true indicates a duplicate. We don't do anything about * that, a later field with the same name overrides the earlier field. */ hashentry->type = _state->saved_token_type; Assert(isnull == (hashentry->type == JSON_TOKEN_NULL)); if (_state->save_json_start != NULL) { int len = _state->lex->prev_token_terminator - _state->save_json_start; char *val = palloc((len + 1) * sizeof(char)); memcpy(val, _state->save_json_start, len); val[len] = '\0'; hashentry->val = val; } else { /* must have had a scalar instead */ hashentry->val = _state->saved_scalar; } } /* * Semantic actions for json_strip_nulls. * * Simply repeat the input on the output unless we encounter * a null object field. State for this is set when the field * is started and reset when the scalar action (which must be next) * is called. */ static void sn_object_start(void *state) { StripnullState *_state = (StripnullState *) state; appendStringInfoCharMacro(_state->strval, '{'); } static void sn_object_end(void *state) { StripnullState *_state = (StripnullState *) state; appendStringInfoCharMacro(_state->strval, '}'); } static void sn_array_start(void *state) { StripnullState *_state = (StripnullState *) state; appendStringInfoCharMacro(_state->strval, '['); } static void sn_array_end(void *state) { StripnullState *_state = (StripnullState *) state; appendStringInfoCharMacro(_state->strval, ']'); } static void sn_object_field_start(void *state, char *fname, bool isnull) { StripnullState *_state = (StripnullState *) state; if (isnull) { /* * The next thing must be a scalar or isnull couldn't be true, so * there is no danger of this state being carried down into a nested * object or array. The flag will be reset in the scalar action. */ _state->skip_next_null = true; return; } if (_state->strval->data[_state->strval->len - 1] != '{') appendStringInfoCharMacro(_state->strval, ','); /* * Unfortunately we don't have the quoted and escaped string any more, so * we have to re-escape it. */ escape_json(_state->strval, fname); appendStringInfoCharMacro(_state->strval, ':'); } static void sn_array_element_start(void *state, bool isnull) { StripnullState *_state = (StripnullState *) state; if (_state->strval->data[_state->strval->len - 1] != '[') appendStringInfoCharMacro(_state->strval, ','); } static void sn_scalar(void *state, char *token, JsonTokenType tokentype) { StripnullState *_state = (StripnullState *) state; if (_state->skip_next_null) { Assert(tokentype == JSON_TOKEN_NULL); _state->skip_next_null = false; return; } if (tokentype == JSON_TOKEN_STRING) escape_json(_state->strval, token); else appendStringInfoString(_state->strval, token); } /* * SQL function json_strip_nulls(json) -> json */ Datum json_strip_nulls(PG_FUNCTION_ARGS) { text *json = PG_GETARG_TEXT_PP(0); StripnullState *state; JsonLexContext *lex; JsonSemAction *sem; lex = makeJsonLexContext(json, true); state = palloc0(sizeof(StripnullState)); sem = palloc0(sizeof(JsonSemAction)); state->strval = makeStringInfo(); state->skip_next_null = false; state->lex = lex; sem->semstate = (void *) state; sem->object_start = sn_object_start; sem->object_end = sn_object_end; sem->array_start = sn_array_start; sem->array_end = sn_array_end; sem->scalar = sn_scalar; sem->array_element_start = sn_array_element_start; sem->object_field_start = sn_object_field_start; pg_parse_json_or_ereport(lex, sem); PG_RETURN_TEXT_P(cstring_to_text_with_len(state->strval->data, state->strval->len)); } /* * SQL function jsonb_strip_nulls(jsonb) -> jsonb */ Datum jsonb_strip_nulls(PG_FUNCTION_ARGS) { Jsonb *jb = PG_GETARG_JSONB_P(0); JsonbIterator *it; JsonbParseState *parseState = NULL; JsonbValue *res = NULL; JsonbValue v, k; JsonbIteratorToken type; bool last_was_key = false; if (JB_ROOT_IS_SCALAR(jb)) PG_RETURN_POINTER(jb); it = JsonbIteratorInit(&jb->root); while ((type = JsonbIteratorNext(&it, &v, false)) != WJB_DONE) { Assert(!(type == WJB_KEY && last_was_key)); if (type == WJB_KEY) { /* stash the key until we know if it has a null value */ k = v; last_was_key = true; continue; } if (last_was_key) { /* if the last element was a key this one can't be */ last_was_key = false; /* skip this field if value is null */ if (type == WJB_VALUE && v.type == jbvNull) continue; /* otherwise, do a delayed push of the key */ (void) pushJsonbValue(&parseState, WJB_KEY, &k); } if (type == WJB_VALUE || type == WJB_ELEM) res = pushJsonbValue(&parseState, type, &v); else res = pushJsonbValue(&parseState, type, NULL); } Assert(res != NULL); PG_RETURN_POINTER(JsonbValueToJsonb(res)); } /* * SQL function jsonb_pretty (jsonb) * * Pretty-printed text for the jsonb */ Datum jsonb_pretty(PG_FUNCTION_ARGS) { Jsonb *jb = PG_GETARG_JSONB_P(0); StringInfo str = makeStringInfo(); JsonbToCStringIndent(str, &jb->root, VARSIZE(jb)); PG_RETURN_TEXT_P(cstring_to_text_with_len(str->data, str->len)); } /* * SQL function jsonb_concat (jsonb, jsonb) * * function for || operator */ Datum jsonb_concat(PG_FUNCTION_ARGS) { Jsonb *jb1 = PG_GETARG_JSONB_P(0); Jsonb *jb2 = PG_GETARG_JSONB_P(1); JsonbParseState *state = NULL; JsonbValue *res; JsonbIterator *it1, *it2; /* * If one of the jsonb is empty, just return the other if it's not scalar * and both are of the same kind. If it's a scalar or they are of * different kinds we need to perform the concatenation even if one is * empty. */ if (JB_ROOT_IS_OBJECT(jb1) == JB_ROOT_IS_OBJECT(jb2)) { if (JB_ROOT_COUNT(jb1) == 0 && !JB_ROOT_IS_SCALAR(jb2)) PG_RETURN_JSONB_P(jb2); else if (JB_ROOT_COUNT(jb2) == 0 && !JB_ROOT_IS_SCALAR(jb1)) PG_RETURN_JSONB_P(jb1); } it1 = JsonbIteratorInit(&jb1->root); it2 = JsonbIteratorInit(&jb2->root); res = IteratorConcat(&it1, &it2, &state); Assert(res != NULL); PG_RETURN_JSONB_P(JsonbValueToJsonb(res)); } /* * SQL function jsonb_delete (jsonb, text) * * return a copy of the jsonb with the indicated item * removed. */ Datum jsonb_delete(PG_FUNCTION_ARGS) { Jsonb *in = PG_GETARG_JSONB_P(0); text *key = PG_GETARG_TEXT_PP(1); char *keyptr = VARDATA_ANY(key); int keylen = VARSIZE_ANY_EXHDR(key); JsonbParseState *state = NULL; JsonbIterator *it; JsonbValue v, *res = NULL; bool skipNested = false; JsonbIteratorToken r; if (JB_ROOT_IS_SCALAR(in)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot delete from scalar"))); if (JB_ROOT_COUNT(in) == 0) PG_RETURN_JSONB_P(in); it = JsonbIteratorInit(&in->root); while ((r = JsonbIteratorNext(&it, &v, skipNested)) != WJB_DONE) { skipNested = true; if ((r == WJB_ELEM || r == WJB_KEY) && (v.type == jbvString && keylen == v.val.string.len && memcmp(keyptr, v.val.string.val, keylen) == 0)) { /* skip corresponding value as well */ if (r == WJB_KEY) (void) JsonbIteratorNext(&it, &v, true); continue; } res = pushJsonbValue(&state, r, r < WJB_BEGIN_ARRAY ? &v : NULL); } Assert(res != NULL); PG_RETURN_JSONB_P(JsonbValueToJsonb(res)); } /* * SQL function jsonb_delete (jsonb, variadic text[]) * * return a copy of the jsonb with the indicated items * removed. */ Datum jsonb_delete_array(PG_FUNCTION_ARGS) { Jsonb *in = PG_GETARG_JSONB_P(0); ArrayType *keys = PG_GETARG_ARRAYTYPE_P(1); Datum *keys_elems; bool *keys_nulls; int keys_len; JsonbParseState *state = NULL; JsonbIterator *it; JsonbValue v, *res = NULL; bool skipNested = false; JsonbIteratorToken r; if (ARR_NDIM(keys) > 1) ereport(ERROR, (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR), errmsg("wrong number of array subscripts"))); if (JB_ROOT_IS_SCALAR(in)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot delete from scalar"))); if (JB_ROOT_COUNT(in) == 0) PG_RETURN_JSONB_P(in); deconstruct_array(keys, TEXTOID, -1, false, TYPALIGN_INT, &keys_elems, &keys_nulls, &keys_len); if (keys_len == 0) PG_RETURN_JSONB_P(in); it = JsonbIteratorInit(&in->root); while ((r = JsonbIteratorNext(&it, &v, skipNested)) != WJB_DONE) { skipNested = true; if ((r == WJB_ELEM || r == WJB_KEY) && v.type == jbvString) { int i; bool found = false; for (i = 0; i < keys_len; i++) { char *keyptr; int keylen; if (keys_nulls[i]) continue; keyptr = VARDATA_ANY(keys_elems[i]); keylen = VARSIZE_ANY_EXHDR(keys_elems[i]); if (keylen == v.val.string.len && memcmp(keyptr, v.val.string.val, keylen) == 0) { found = true; break; } } if (found) { /* skip corresponding value as well */ if (r == WJB_KEY) (void) JsonbIteratorNext(&it, &v, true); continue; } } res = pushJsonbValue(&state, r, r < WJB_BEGIN_ARRAY ? &v : NULL); } Assert(res != NULL); PG_RETURN_JSONB_P(JsonbValueToJsonb(res)); } /* * SQL function jsonb_delete (jsonb, int) * * return a copy of the jsonb with the indicated item * removed. Negative int means count back from the * end of the items. */ Datum jsonb_delete_idx(PG_FUNCTION_ARGS) { Jsonb *in = PG_GETARG_JSONB_P(0); int idx = PG_GETARG_INT32(1); JsonbParseState *state = NULL; JsonbIterator *it; uint32 i = 0, n; JsonbValue v, *res = NULL; JsonbIteratorToken r; if (JB_ROOT_IS_SCALAR(in)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot delete from scalar"))); if (JB_ROOT_IS_OBJECT(in)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot delete from object using integer index"))); if (JB_ROOT_COUNT(in) == 0) PG_RETURN_JSONB_P(in); it = JsonbIteratorInit(&in->root); r = JsonbIteratorNext(&it, &v, false); Assert(r == WJB_BEGIN_ARRAY); n = v.val.array.nElems; if (idx < 0) { if (-idx > n) idx = n; else idx = n + idx; } if (idx >= n) PG_RETURN_JSONB_P(in); pushJsonbValue(&state, r, NULL); while ((r = JsonbIteratorNext(&it, &v, true)) != WJB_DONE) { if (r == WJB_ELEM) { if (i++ == idx) continue; } res = pushJsonbValue(&state, r, r < WJB_BEGIN_ARRAY ? &v : NULL); } Assert(res != NULL); PG_RETURN_JSONB_P(JsonbValueToJsonb(res)); } /* * SQL function jsonb_set(jsonb, text[], jsonb, boolean) */ Datum jsonb_set(PG_FUNCTION_ARGS) { Jsonb *in = PG_GETARG_JSONB_P(0); ArrayType *path = PG_GETARG_ARRAYTYPE_P(1); Jsonb *newjsonb = PG_GETARG_JSONB_P(2); JsonbValue newval; bool create = PG_GETARG_BOOL(3); JsonbValue *res = NULL; Datum *path_elems; bool *path_nulls; int path_len; JsonbIterator *it; JsonbParseState *st = NULL; JsonbToJsonbValue(newjsonb, &newval); if (ARR_NDIM(path) > 1) ereport(ERROR, (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR), errmsg("wrong number of array subscripts"))); if (JB_ROOT_IS_SCALAR(in)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot set path in scalar"))); if (JB_ROOT_COUNT(in) == 0 && !create) PG_RETURN_JSONB_P(in); deconstruct_array(path, TEXTOID, -1, false, TYPALIGN_INT, &path_elems, &path_nulls, &path_len); if (path_len == 0) PG_RETURN_JSONB_P(in); it = JsonbIteratorInit(&in->root); res = setPath(&it, path_elems, path_nulls, path_len, &st, 0, &newval, create ? JB_PATH_CREATE : JB_PATH_REPLACE); Assert(res != NULL); PG_RETURN_JSONB_P(JsonbValueToJsonb(res)); } /* * SQL function jsonb_set_lax(jsonb, text[], jsonb, boolean, text) */ Datum jsonb_set_lax(PG_FUNCTION_ARGS) { /* Jsonb *in = PG_GETARG_JSONB_P(0); */ /* ArrayType *path = PG_GETARG_ARRAYTYPE_P(1); */ /* Jsonb *newval = PG_GETARG_JSONB_P(2); */ /* bool create = PG_GETARG_BOOL(3); */ text *handle_null; char *handle_val; if (PG_ARGISNULL(0) || PG_ARGISNULL(1) || PG_ARGISNULL(3)) PG_RETURN_NULL(); /* could happen if they pass in an explicit NULL */ if (PG_ARGISNULL(4)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("null_value_treatment must be \"delete_key\", \"return_target\", \"use_json_null\", or \"raise_exception\""))); /* if the new value isn't an SQL NULL just call jsonb_set */ if (!PG_ARGISNULL(2)) return jsonb_set(fcinfo); handle_null = PG_GETARG_TEXT_P(4); handle_val = text_to_cstring(handle_null); if (strcmp(handle_val, "raise_exception") == 0) { ereport(ERROR, (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED), errmsg("JSON value must not be null"), errdetail("Exception was raised because null_value_treatment is \"raise_exception\"."), errhint("To avoid, either change the null_value_treatment argument or ensure that an SQL NULL is not passed."))); return (Datum) 0; /* silence stupider compilers */ } else if (strcmp(handle_val, "use_json_null") == 0) { Datum newval; newval = DirectFunctionCall1(jsonb_in, CStringGetDatum("null")); fcinfo->args[2].value = newval; fcinfo->args[2].isnull = false; return jsonb_set(fcinfo); } else if (strcmp(handle_val, "delete_key") == 0) { return jsonb_delete_path(fcinfo); } else if (strcmp(handle_val, "return_target") == 0) { Jsonb *in = PG_GETARG_JSONB_P(0); PG_RETURN_JSONB_P(in); } else { ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("null_value_treatment must be \"delete_key\", \"return_target\", \"use_json_null\", or \"raise_exception\""))); return (Datum) 0; /* silence stupider compilers */ } } /* * SQL function jsonb_delete_path(jsonb, text[]) */ Datum jsonb_delete_path(PG_FUNCTION_ARGS) { Jsonb *in = PG_GETARG_JSONB_P(0); ArrayType *path = PG_GETARG_ARRAYTYPE_P(1); JsonbValue *res = NULL; Datum *path_elems; bool *path_nulls; int path_len; JsonbIterator *it; JsonbParseState *st = NULL; if (ARR_NDIM(path) > 1) ereport(ERROR, (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR), errmsg("wrong number of array subscripts"))); if (JB_ROOT_IS_SCALAR(in)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot delete path in scalar"))); if (JB_ROOT_COUNT(in) == 0) PG_RETURN_JSONB_P(in); deconstruct_array(path, TEXTOID, -1, false, TYPALIGN_INT, &path_elems, &path_nulls, &path_len); if (path_len == 0) PG_RETURN_JSONB_P(in); it = JsonbIteratorInit(&in->root); res = setPath(&it, path_elems, path_nulls, path_len, &st, 0, NULL, JB_PATH_DELETE); Assert(res != NULL); PG_RETURN_JSONB_P(JsonbValueToJsonb(res)); } /* * SQL function jsonb_insert(jsonb, text[], jsonb, boolean) */ Datum jsonb_insert(PG_FUNCTION_ARGS) { Jsonb *in = PG_GETARG_JSONB_P(0); ArrayType *path = PG_GETARG_ARRAYTYPE_P(1); Jsonb *newjsonb = PG_GETARG_JSONB_P(2); JsonbValue newval; bool after = PG_GETARG_BOOL(3); JsonbValue *res = NULL; Datum *path_elems; bool *path_nulls; int path_len; JsonbIterator *it; JsonbParseState *st = NULL; JsonbToJsonbValue(newjsonb, &newval); if (ARR_NDIM(path) > 1) ereport(ERROR, (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR), errmsg("wrong number of array subscripts"))); if (JB_ROOT_IS_SCALAR(in)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot set path in scalar"))); deconstruct_array(path, TEXTOID, -1, false, TYPALIGN_INT, &path_elems, &path_nulls, &path_len); if (path_len == 0) PG_RETURN_JSONB_P(in); it = JsonbIteratorInit(&in->root); res = setPath(&it, path_elems, path_nulls, path_len, &st, 0, &newval, after ? JB_PATH_INSERT_AFTER : JB_PATH_INSERT_BEFORE); Assert(res != NULL); PG_RETURN_JSONB_P(JsonbValueToJsonb(res)); } /* * Iterate over all jsonb objects and merge them into one. * The logic of this function copied from the same hstore function, * except the case, when it1 & it2 represents jbvObject. * In that case we just append the content of it2 to it1 without any * verifications. */ static JsonbValue * IteratorConcat(JsonbIterator **it1, JsonbIterator **it2, JsonbParseState **state) { JsonbValue v1, v2, *res = NULL; JsonbIteratorToken r1, r2, rk1, rk2; rk1 = JsonbIteratorNext(it1, &v1, false); rk2 = JsonbIteratorNext(it2, &v2, false); /* * JsonbIteratorNext reports raw scalars as if they were single-element * arrays; hence we only need consider "object" and "array" cases here. */ if (rk1 == WJB_BEGIN_OBJECT && rk2 == WJB_BEGIN_OBJECT) { /* * Both inputs are objects. * * Append all the tokens from v1 to res, except last WJB_END_OBJECT * (because res will not be finished yet). */ pushJsonbValue(state, rk1, NULL); while ((r1 = JsonbIteratorNext(it1, &v1, true)) != WJB_END_OBJECT) pushJsonbValue(state, r1, &v1); /* * Append all the tokens from v2 to res, including last WJB_END_OBJECT * (the concatenation will be completed). Any duplicate keys will * automatically override the value from the first object. */ while ((r2 = JsonbIteratorNext(it2, &v2, true)) != WJB_DONE) res = pushJsonbValue(state, r2, r2 != WJB_END_OBJECT ? &v2 : NULL); } else if (rk1 == WJB_BEGIN_ARRAY && rk2 == WJB_BEGIN_ARRAY) { /* * Both inputs are arrays. */ pushJsonbValue(state, rk1, NULL); while ((r1 = JsonbIteratorNext(it1, &v1, true)) != WJB_END_ARRAY) { Assert(r1 == WJB_ELEM); pushJsonbValue(state, r1, &v1); } while ((r2 = JsonbIteratorNext(it2, &v2, true)) != WJB_END_ARRAY) { Assert(r2 == WJB_ELEM); pushJsonbValue(state, WJB_ELEM, &v2); } res = pushJsonbValue(state, WJB_END_ARRAY, NULL /* signal to sort */ ); } else if (rk1 == WJB_BEGIN_OBJECT) { /* * We have object || array. */ Assert(rk2 == WJB_BEGIN_ARRAY); pushJsonbValue(state, WJB_BEGIN_ARRAY, NULL); pushJsonbValue(state, WJB_BEGIN_OBJECT, NULL); while ((r1 = JsonbIteratorNext(it1, &v1, true)) != WJB_DONE) pushJsonbValue(state, r1, r1 != WJB_END_OBJECT ? &v1 : NULL); while ((r2 = JsonbIteratorNext(it2, &v2, true)) != WJB_DONE) res = pushJsonbValue(state, r2, r2 != WJB_END_ARRAY ? &v2 : NULL); } else { /* * We have array || object. */ Assert(rk1 == WJB_BEGIN_ARRAY); Assert(rk2 == WJB_BEGIN_OBJECT); pushJsonbValue(state, WJB_BEGIN_ARRAY, NULL); while ((r1 = JsonbIteratorNext(it1, &v1, true)) != WJB_END_ARRAY) pushJsonbValue(state, r1, &v1); pushJsonbValue(state, WJB_BEGIN_OBJECT, NULL); while ((r2 = JsonbIteratorNext(it2, &v2, true)) != WJB_DONE) pushJsonbValue(state, r2, r2 != WJB_END_OBJECT ? &v2 : NULL); res = pushJsonbValue(state, WJB_END_ARRAY, NULL); } return res; } /* * Do most of the heavy work for jsonb_set/jsonb_insert * * If JB_PATH_DELETE bit is set in op_type, the element is to be removed. * * If any bit mentioned in JB_PATH_CREATE_OR_INSERT is set in op_type, * we create the new value if the key or array index does not exist. * * Bits JB_PATH_INSERT_BEFORE and JB_PATH_INSERT_AFTER in op_type * behave as JB_PATH_CREATE if new value is inserted in JsonbObject. * * If JB_PATH_FILL_GAPS bit is set, this will change an assignment logic in * case if target is an array. The assignment index will not be restricted by * number of elements in the array, and if there are any empty slots between * last element of the array and a new one they will be filled with nulls. If * the index is negative, it still will be considered an index from the end * of the array. Of a part of the path is not present and this part is more * than just one last element, this flag will instruct to create the whole * chain of corresponding objects and insert the value. * * JB_PATH_CONSISTENT_POSITION for an array indicates that the caller wants to * keep values with fixed indices. Indices for existing elements could be * changed (shifted forward) in case if the array is prepended with a new value * and a negative index out of the range, so this behavior will be prevented * and return an error. * * All path elements before the last must already exist * whatever bits in op_type are set, or nothing is done. */ static JsonbValue * setPath(JsonbIterator **it, Datum *path_elems, bool *path_nulls, int path_len, JsonbParseState **st, int level, JsonbValue *newval, int op_type) { JsonbValue v; JsonbIteratorToken r; JsonbValue *res; check_stack_depth(); if (path_nulls[level]) ereport(ERROR, (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED), errmsg("path element at position %d is null", level + 1))); r = JsonbIteratorNext(it, &v, false); switch (r) { case WJB_BEGIN_ARRAY: /* * If instructed complain about attempts to replace whithin a raw * scalar value. This happens even when current level is equal to * path_len, because the last path key should also correspond to * an object or an array, not raw scalar. */ if ((op_type & JB_PATH_FILL_GAPS) && (level <= path_len - 1) && v.val.array.rawScalar) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot replace existing key"), errdetail("The path assumes key is a composite object, " "but it is a scalar value."))); (void) pushJsonbValue(st, r, NULL); setPathArray(it, path_elems, path_nulls, path_len, st, level, newval, v.val.array.nElems, op_type); r = JsonbIteratorNext(it, &v, false); Assert(r == WJB_END_ARRAY); res = pushJsonbValue(st, r, NULL); break; case WJB_BEGIN_OBJECT: (void) pushJsonbValue(st, r, NULL); setPathObject(it, path_elems, path_nulls, path_len, st, level, newval, v.val.object.nPairs, op_type); r = JsonbIteratorNext(it, &v, true); Assert(r == WJB_END_OBJECT); res = pushJsonbValue(st, r, NULL); break; case WJB_ELEM: case WJB_VALUE: /* * If instructed complain about attempts to replace whithin a * scalar value. This happens even when current level is equal to * path_len, because the last path key should also correspond to * an object or an array, not an element or value. */ if ((op_type & JB_PATH_FILL_GAPS) && (level <= path_len - 1)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot replace existing key"), errdetail("The path assumes key is a composite object, " "but it is a scalar value."))); res = pushJsonbValue(st, r, &v); break; default: elog(ERROR, "unrecognized iterator result: %d", (int) r); res = NULL; /* keep compiler quiet */ break; } return res; } /* * Object walker for setPath */ static void setPathObject(JsonbIterator **it, Datum *path_elems, bool *path_nulls, int path_len, JsonbParseState **st, int level, JsonbValue *newval, uint32 npairs, int op_type) { int i; JsonbValue k, v; bool done = false; if (level >= path_len || path_nulls[level]) done = true; /* empty object is a special case for create */ if ((npairs == 0) && (op_type & JB_PATH_CREATE_OR_INSERT) && (level == path_len - 1)) { JsonbValue newkey; newkey.type = jbvString; newkey.val.string.len = VARSIZE_ANY_EXHDR(path_elems[level]); newkey.val.string.val = VARDATA_ANY(path_elems[level]); (void) pushJsonbValue(st, WJB_KEY, &newkey); (void) pushJsonbValue(st, WJB_VALUE, newval); } for (i = 0; i < npairs; i++) { JsonbIteratorToken r = JsonbIteratorNext(it, &k, true); Assert(r == WJB_KEY); if (!done && k.val.string.len == VARSIZE_ANY_EXHDR(path_elems[level]) && memcmp(k.val.string.val, VARDATA_ANY(path_elems[level]), k.val.string.len) == 0) { done = true; if (level == path_len - 1) { /* * called from jsonb_insert(), it forbids redefining an * existing value */ if (op_type & (JB_PATH_INSERT_BEFORE | JB_PATH_INSERT_AFTER)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot replace existing key"), errhint("Try using the function jsonb_set " "to replace key value."))); r = JsonbIteratorNext(it, &v, true); /* skip value */ if (!(op_type & JB_PATH_DELETE)) { (void) pushJsonbValue(st, WJB_KEY, &k); (void) pushJsonbValue(st, WJB_VALUE, newval); } } else { (void) pushJsonbValue(st, r, &k); setPath(it, path_elems, path_nulls, path_len, st, level + 1, newval, op_type); } } else { if ((op_type & JB_PATH_CREATE_OR_INSERT) && !done && level == path_len - 1 && i == npairs - 1) { JsonbValue newkey; newkey.type = jbvString; newkey.val.string.len = VARSIZE_ANY_EXHDR(path_elems[level]); newkey.val.string.val = VARDATA_ANY(path_elems[level]); (void) pushJsonbValue(st, WJB_KEY, &newkey); (void) pushJsonbValue(st, WJB_VALUE, newval); } (void) pushJsonbValue(st, r, &k); r = JsonbIteratorNext(it, &v, false); (void) pushJsonbValue(st, r, r < WJB_BEGIN_ARRAY ? &v : NULL); if (r == WJB_BEGIN_ARRAY || r == WJB_BEGIN_OBJECT) { int walking_level = 1; while (walking_level != 0) { r = JsonbIteratorNext(it, &v, false); if (r == WJB_BEGIN_ARRAY || r == WJB_BEGIN_OBJECT) ++walking_level; if (r == WJB_END_ARRAY || r == WJB_END_OBJECT) --walking_level; (void) pushJsonbValue(st, r, r < WJB_BEGIN_ARRAY ? &v : NULL); } } } } /*-- * If we got here there are only few possibilities: * - no target path was found, and an open object with some keys/values was * pushed into the state * - an object is empty, only WJB_BEGIN_OBJECT is pushed * * In both cases if instructed to create the path when not present, * generate the whole chain of empty objects and insert the new value * there. */ if (!done && (op_type & JB_PATH_FILL_GAPS) && (level < path_len - 1)) { JsonbValue newkey; newkey.type = jbvString; newkey.val.string.len = VARSIZE_ANY_EXHDR(path_elems[level]); newkey.val.string.val = VARDATA_ANY(path_elems[level]); (void) pushJsonbValue(st, WJB_KEY, &newkey); (void) push_path(st, level, path_elems, path_nulls, path_len, newval); /* Result is closed with WJB_END_OBJECT outside of this function */ } } /* * Array walker for setPath */ static void setPathArray(JsonbIterator **it, Datum *path_elems, bool *path_nulls, int path_len, JsonbParseState **st, int level, JsonbValue *newval, uint32 nelems, int op_type) { JsonbValue v; int idx, i; bool done = false; /* pick correct index */ if (level < path_len && !path_nulls[level]) { char *c = TextDatumGetCString(path_elems[level]); char *badp; errno = 0; idx = strtoint(c, &badp, 10); if (badp == c || *badp != '\0' || errno != 0) ereport(ERROR, (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION), errmsg("path element at position %d is not an integer: \"%s\"", level + 1, c))); } else idx = nelems; if (idx < 0) { if (-idx > nelems) { /* * If asked to keep elements position consistent, it's not allowed * to prepend the array. */ if (op_type & JB_PATH_CONSISTENT_POSITION) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("path element at position %d is out of range: %d", level + 1, idx))); else idx = INT_MIN; } else idx = nelems + idx; } /* * Filling the gaps means there are no limits on the positive index are * imposed, we can set any element. Otherwise limit the index by nelems. */ if (!(op_type & JB_PATH_FILL_GAPS)) { if (idx > 0 && idx > nelems) idx = nelems; } /* * if we're creating, and idx == INT_MIN, we prepend the new value to the * array also if the array is empty - in which case we don't really care * what the idx value is */ if ((idx == INT_MIN || nelems == 0) && (level == path_len - 1) && (op_type & JB_PATH_CREATE_OR_INSERT)) { Assert(newval != NULL); if (op_type & JB_PATH_FILL_GAPS && nelems == 0 && idx > 0) push_null_elements(st, idx); (void) pushJsonbValue(st, WJB_ELEM, newval); done = true; } /* iterate over the array elements */ for (i = 0; i < nelems; i++) { JsonbIteratorToken r; if (i == idx && level < path_len) { done = true; if (level == path_len - 1) { r = JsonbIteratorNext(it, &v, true); /* skip */ if (op_type & (JB_PATH_INSERT_BEFORE | JB_PATH_CREATE)) (void) pushJsonbValue(st, WJB_ELEM, newval); /* * We should keep current value only in case of * JB_PATH_INSERT_BEFORE or JB_PATH_INSERT_AFTER because * otherwise it should be deleted or replaced */ if (op_type & (JB_PATH_INSERT_AFTER | JB_PATH_INSERT_BEFORE)) (void) pushJsonbValue(st, r, &v); if (op_type & (JB_PATH_INSERT_AFTER | JB_PATH_REPLACE)) (void) pushJsonbValue(st, WJB_ELEM, newval); } else (void) setPath(it, path_elems, path_nulls, path_len, st, level + 1, newval, op_type); } else { r = JsonbIteratorNext(it, &v, false); (void) pushJsonbValue(st, r, r < WJB_BEGIN_ARRAY ? &v : NULL); if (r == WJB_BEGIN_ARRAY || r == WJB_BEGIN_OBJECT) { int walking_level = 1; while (walking_level != 0) { r = JsonbIteratorNext(it, &v, false); if (r == WJB_BEGIN_ARRAY || r == WJB_BEGIN_OBJECT) ++walking_level; if (r == WJB_END_ARRAY || r == WJB_END_OBJECT) --walking_level; (void) pushJsonbValue(st, r, r < WJB_BEGIN_ARRAY ? &v : NULL); } } } } if ((op_type & JB_PATH_CREATE_OR_INSERT) && !done && level == path_len - 1) { /* * If asked to fill the gaps, idx could be bigger than nelems, so * prepend the new element with nulls if that's the case. */ if (op_type & JB_PATH_FILL_GAPS && idx > nelems) push_null_elements(st, idx - nelems); (void) pushJsonbValue(st, WJB_ELEM, newval); done = true; } /*-- * If we got here there are only few possibilities: * - no target path was found, and an open array with some keys/values was * pushed into the state * - an array is empty, only WJB_BEGIN_ARRAY is pushed * * In both cases if instructed to create the path when not present, * generate the whole chain of empty objects and insert the new value * there. */ if (!done && (op_type & JB_PATH_FILL_GAPS) && (level < path_len - 1)) { if (idx > 0) push_null_elements(st, idx - nelems); (void) push_path(st, level, path_elems, path_nulls, path_len, newval); /* Result is closed with WJB_END_OBJECT outside of this function */ } } /* * Parse information about what elements of a jsonb document we want to iterate * in functions iterate_json(b)_values. This information is presented in jsonb * format, so that it can be easily extended in the future. */ uint32 parse_jsonb_index_flags(Jsonb *jb) { JsonbIterator *it; JsonbValue v; JsonbIteratorToken type; uint32 flags = 0; it = JsonbIteratorInit(&jb->root); type = JsonbIteratorNext(&it, &v, false); /* * We iterate over array (scalar internally is represented as array, so, * we will accept it too) to check all its elements. Flag names are * chosen the same as jsonb_typeof uses. */ if (type != WJB_BEGIN_ARRAY) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("wrong flag type, only arrays and scalars are allowed"))); while ((type = JsonbIteratorNext(&it, &v, false)) == WJB_ELEM) { if (v.type != jbvString) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("flag array element is not a string"), errhint("Possible values are: \"string\", \"numeric\", \"boolean\", \"key\", and \"all\"."))); if (v.val.string.len == 3 && pg_strncasecmp(v.val.string.val, "all", 3) == 0) flags |= jtiAll; else if (v.val.string.len == 3 && pg_strncasecmp(v.val.string.val, "key", 3) == 0) flags |= jtiKey; else if (v.val.string.len == 6 && pg_strncasecmp(v.val.string.val, "string", 6) == 0) flags |= jtiString; else if (v.val.string.len == 7 && pg_strncasecmp(v.val.string.val, "numeric", 7) == 0) flags |= jtiNumeric; else if (v.val.string.len == 7 && pg_strncasecmp(v.val.string.val, "boolean", 7) == 0) flags |= jtiBool; else ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("wrong flag in flag array: \"%s\"", pnstrdup(v.val.string.val, v.val.string.len)), errhint("Possible values are: \"string\", \"numeric\", \"boolean\", \"key\", and \"all\"."))); } /* expect end of array now */ if (type != WJB_END_ARRAY) elog(ERROR, "unexpected end of flag array"); /* get final WJB_DONE and free iterator */ type = JsonbIteratorNext(&it, &v, false); if (type != WJB_DONE) elog(ERROR, "unexpected end of flag array"); return flags; } /* * Iterate over jsonb values or elements, specified by flags, and pass them * together with an iteration state to a specified JsonIterateStringValuesAction. */ void iterate_jsonb_values(Jsonb *jb, uint32 flags, void *state, JsonIterateStringValuesAction action) { JsonbIterator *it; JsonbValue v; JsonbIteratorToken type; it = JsonbIteratorInit(&jb->root); /* * Just recursively iterating over jsonb and call callback on all * corresponding elements */ while ((type = JsonbIteratorNext(&it, &v, false)) != WJB_DONE) { if (type == WJB_KEY) { if (flags & jtiKey) action(state, v.val.string.val, v.val.string.len); continue; } else if (!(type == WJB_VALUE || type == WJB_ELEM)) { /* do not call callback for composite JsonbValue */ continue; } /* JsonbValue is a value of object or element of array */ switch (v.type) { case jbvString: if (flags & jtiString) action(state, v.val.string.val, v.val.string.len); break; case jbvNumeric: if (flags & jtiNumeric) { char *val; val = DatumGetCString(DirectFunctionCall1(numeric_out, NumericGetDatum(v.val.numeric))); action(state, val, strlen(val)); pfree(val); } break; case jbvBool: if (flags & jtiBool) { if (v.val.boolean) action(state, "true", 4); else action(state, "false", 5); } break; default: /* do not call callback for composite JsonbValue */ break; } } } /* * Iterate over json values and elements, specified by flags, and pass them * together with an iteration state to a specified JsonIterateStringValuesAction. */ void iterate_json_values(text *json, uint32 flags, void *action_state, JsonIterateStringValuesAction action) { JsonLexContext *lex = makeJsonLexContext(json, true); JsonSemAction *sem = palloc0(sizeof(JsonSemAction)); IterateJsonStringValuesState *state = palloc0(sizeof(IterateJsonStringValuesState)); state->lex = lex; state->action = action; state->action_state = action_state; state->flags = flags; sem->semstate = (void *) state; sem->scalar = iterate_values_scalar; sem->object_field_start = iterate_values_object_field_start; pg_parse_json_or_ereport(lex, sem); } /* * An auxiliary function for iterate_json_values to invoke a specified * JsonIterateStringValuesAction for specified values. */ static void iterate_values_scalar(void *state, char *token, JsonTokenType tokentype) { IterateJsonStringValuesState *_state = (IterateJsonStringValuesState *) state; switch (tokentype) { case JSON_TOKEN_STRING: if (_state->flags & jtiString) _state->action(_state->action_state, token, strlen(token)); break; case JSON_TOKEN_NUMBER: if (_state->flags & jtiNumeric) _state->action(_state->action_state, token, strlen(token)); break; case JSON_TOKEN_TRUE: case JSON_TOKEN_FALSE: if (_state->flags & jtiBool) _state->action(_state->action_state, token, strlen(token)); break; default: /* do not call callback for any other token */ break; } } static void iterate_values_object_field_start(void *state, char *fname, bool isnull) { IterateJsonStringValuesState *_state = (IterateJsonStringValuesState *) state; if (_state->flags & jtiKey) { char *val = pstrdup(fname); _state->action(_state->action_state, val, strlen(val)); } } /* * Iterate over a jsonb, and apply a specified JsonTransformStringValuesAction * to every string value or element. Any necessary context for a * JsonTransformStringValuesAction can be passed in the action_state variable. * Function returns a copy of an original jsonb object with transformed values. */ Jsonb * transform_jsonb_string_values(Jsonb *jsonb, void *action_state, JsonTransformStringValuesAction transform_action) { JsonbIterator *it; JsonbValue v, *res = NULL; JsonbIteratorToken type; JsonbParseState *st = NULL; text *out; bool is_scalar = false; it = JsonbIteratorInit(&jsonb->root); is_scalar = it->isScalar; while ((type = JsonbIteratorNext(&it, &v, false)) != WJB_DONE) { if ((type == WJB_VALUE || type == WJB_ELEM) && v.type == jbvString) { out = transform_action(action_state, v.val.string.val, v.val.string.len); v.val.string.val = VARDATA_ANY(out); v.val.string.len = VARSIZE_ANY_EXHDR(out); res = pushJsonbValue(&st, type, type < WJB_BEGIN_ARRAY ? &v : NULL); } else { res = pushJsonbValue(&st, type, (type == WJB_KEY || type == WJB_VALUE || type == WJB_ELEM) ? &v : NULL); } } if (res->type == jbvArray) res->val.array.rawScalar = is_scalar; return JsonbValueToJsonb(res); } /* * Iterate over a json, and apply a specified JsonTransformStringValuesAction * to every string value or element. Any necessary context for a * JsonTransformStringValuesAction can be passed in the action_state variable. * Function returns a StringInfo, which is a copy of an original json with * transformed values. */ text * transform_json_string_values(text *json, void *action_state, JsonTransformStringValuesAction transform_action) { JsonLexContext *lex = makeJsonLexContext(json, true); JsonSemAction *sem = palloc0(sizeof(JsonSemAction)); TransformJsonStringValuesState *state = palloc0(sizeof(TransformJsonStringValuesState)); state->lex = lex; state->strval = makeStringInfo(); state->action = transform_action; state->action_state = action_state; sem->semstate = (void *) state; sem->scalar = transform_string_values_scalar; sem->object_start = transform_string_values_object_start; sem->object_end = transform_string_values_object_end; sem->array_start = transform_string_values_array_start; sem->array_end = transform_string_values_array_end; sem->scalar = transform_string_values_scalar; sem->array_element_start = transform_string_values_array_element_start; sem->object_field_start = transform_string_values_object_field_start; pg_parse_json_or_ereport(lex, sem); return cstring_to_text_with_len(state->strval->data, state->strval->len); } /* * Set of auxiliary functions for transform_json_string_values to invoke a * specified JsonTransformStringValuesAction for all values and left everything * else untouched. */ static void transform_string_values_object_start(void *state) { TransformJsonStringValuesState *_state = (TransformJsonStringValuesState *) state; appendStringInfoCharMacro(_state->strval, '{'); } static void transform_string_values_object_end(void *state) { TransformJsonStringValuesState *_state = (TransformJsonStringValuesState *) state; appendStringInfoCharMacro(_state->strval, '}'); } static void transform_string_values_array_start(void *state) { TransformJsonStringValuesState *_state = (TransformJsonStringValuesState *) state; appendStringInfoCharMacro(_state->strval, '['); } static void transform_string_values_array_end(void *state) { TransformJsonStringValuesState *_state = (TransformJsonStringValuesState *) state; appendStringInfoCharMacro(_state->strval, ']'); } static void transform_string_values_object_field_start(void *state, char *fname, bool isnull) { TransformJsonStringValuesState *_state = (TransformJsonStringValuesState *) state; if (_state->strval->data[_state->strval->len - 1] != '{') appendStringInfoCharMacro(_state->strval, ','); /* * Unfortunately we don't have the quoted and escaped string any more, so * we have to re-escape it. */ escape_json(_state->strval, fname); appendStringInfoCharMacro(_state->strval, ':'); } static void transform_string_values_array_element_start(void *state, bool isnull) { TransformJsonStringValuesState *_state = (TransformJsonStringValuesState *) state; if (_state->strval->data[_state->strval->len - 1] != '[') appendStringInfoCharMacro(_state->strval, ','); } static void transform_string_values_scalar(void *state, char *token, JsonTokenType tokentype) { TransformJsonStringValuesState *_state = (TransformJsonStringValuesState *) state; if (tokentype == JSON_TOKEN_STRING) { text *out = _state->action(_state->action_state, token, strlen(token)); escape_json(_state->strval, text_to_cstring(out)); } else appendStringInfoString(_state->strval, token); }