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-rw-r--r--libnetdata/json/json.c546
1 files changed, 546 insertions, 0 deletions
diff --git a/libnetdata/json/json.c b/libnetdata/json/json.c
new file mode 100644
index 000000000..c9ff39b05
--- /dev/null
+++ b/libnetdata/json/json.c
@@ -0,0 +1,546 @@
+#include "jsmn.h"
+#include "../libnetdata.h"
+#include "json.h"
+#include "libnetdata/libnetdata.h"
+#include "../../health/health.h"
+
+#define JSON_TOKENS 1024
+
+int json_tokens = JSON_TOKENS;
+
+/**
+ * Json Tokenise
+ *
+ * Map the string given inside tokens.
+ *
+ * @param js is the string used to create the tokens
+ * @param len is the string length
+ * @param count the number of tokens present in the string
+ *
+ * @return it returns the json parsed in tokens
+ */
+#ifdef ENABLE_JSONC
+json_object *json_tokenise(char *js) {
+ if(!js) {
+ error("JSON: json string is empty.");
+ return NULL;
+ }
+
+ json_object *token = json_tokener_parse(js);
+ if(!token) {
+ error("JSON: Invalid json string.");
+ return NULL;
+ }
+
+ return token;
+}
+#else
+jsmntok_t *json_tokenise(char *js, size_t len, size_t *count)
+{
+ int n = json_tokens;
+ if(!js || !len) {
+ error("JSON: json string is empty.");
+ return NULL;
+ }
+
+ jsmn_parser parser;
+ jsmn_init(&parser);
+
+ jsmntok_t *tokens = mallocz(sizeof(jsmntok_t) * n);
+ if(!tokens) return NULL;
+
+ int ret = jsmn_parse(&parser, js, len, tokens, n);
+ while (ret == JSMN_ERROR_NOMEM) {
+ n *= 2;
+ jsmntok_t *new = reallocz(tokens, sizeof(jsmntok_t) * n);
+ if(!new) {
+ freez(tokens);
+ return NULL;
+ }
+ tokens = new;
+ ret = jsmn_parse(&parser, js, len, tokens, n);
+ }
+
+ if (ret == JSMN_ERROR_INVAL) {
+ error("JSON: Invalid json string.");
+ freez(tokens);
+ return NULL;
+ }
+ else if (ret == JSMN_ERROR_PART) {
+ error("JSON: Truncated JSON string.");
+ freez(tokens);
+ return NULL;
+ }
+
+ if(count) *count = (size_t)ret;
+
+ if(json_tokens < n) json_tokens = n;
+ return tokens;
+}
+#endif
+
+/**
+ * Callback Print
+ *
+ * Set callback print case necesary and wrinte an information inside a buffer to write in the log.
+ *
+ * @param e a pointer for a structure that has the complete information about json structure.
+ *
+ * @return It always return 0
+ */
+int json_callback_print(JSON_ENTRY *e)
+{
+ BUFFER *wb=buffer_create(300);
+
+ buffer_sprintf(wb,"%s = ", e->name);
+ char txt[50];
+ switch(e->type) {
+ case JSON_OBJECT:
+ e->callback_function = json_callback_print;
+ buffer_strcat(wb,"OBJECT");
+ break;
+
+ case JSON_ARRAY:
+ e->callback_function = json_callback_print;
+ sprintf(txt,"ARRAY[%lu]", e->data.items);
+ buffer_strcat(wb, txt);
+ break;
+
+ case JSON_STRING:
+ buffer_strcat(wb, e->data.string);
+ break;
+
+ case JSON_NUMBER:
+ sprintf(txt,"%Lf", e->data.number);
+ buffer_strcat(wb,txt);
+
+ break;
+
+ case JSON_BOOLEAN:
+ buffer_strcat(wb, e->data.boolean?"TRUE":"FALSE");
+ break;
+
+ case JSON_NULL:
+ buffer_strcat(wb,"NULL");
+ break;
+ }
+ info("JSON: %s", buffer_tostring(wb));
+ buffer_free(wb);
+ return 0;
+}
+
+/**
+ * JSONC Set String
+ *
+ * Set the string value of the structure JSON_ENTRY.
+ *
+ * @param e the output structure
+ */
+static inline void json_jsonc_set_string(JSON_ENTRY *e,char *key,const char *value) {
+ size_t length = strlen(key);
+ e->type = JSON_STRING;
+ memcpy(e->name,key,length);
+ e->name[length] = 0x00;
+ e->data.string = (char *) value;
+}
+
+
+#ifdef ENABLE_JSONC
+/**
+ * JSONC set Boolean
+ *
+ * Set the boolean value of the structure JSON_ENTRY
+ *
+ * @param e the output structure
+ * @param value the input value
+ */
+static inline void json_jsonc_set_boolean(JSON_ENTRY *e,int value) {
+ e->type = JSON_BOOLEAN;
+ e->data.boolean = value;
+}
+
+/**
+ * Parse Array
+ *
+ * Parse the array object.
+ *
+ * @param ptr the pointer for the object that we will parse.
+ * @param callback_data additional data to be used together the callback function
+ * @param callback_function function used to create a silencer.
+ */
+static inline void json_jsonc_parse_array(json_object *ptr, void *callback_data,int (*callback_function)(struct json_entry *)) {
+ int end = json_object_array_length(ptr);
+ JSON_ENTRY e;
+
+ if(end) {
+ int i;
+ i = 0;
+
+ enum json_type type;
+ do {
+ json_object *jvalue = json_object_array_get_idx(ptr, i);
+ if(jvalue) {
+ e.callback_data = callback_data;
+ e.type = JSON_OBJECT;
+ callback_function(&e);
+ json_object_object_foreach(jvalue, key, val) {
+ type = json_object_get_type(val);
+ if (type == json_type_array) {
+ e.type = JSON_ARRAY;
+ json_jsonc_parse_array(val, callback_data, callback_function);
+ } else if (type == json_type_object) {
+ json_walk(val,callback_data,callback_function);
+ } else if (type == json_type_string) {
+ json_jsonc_set_string(&e,key,json_object_get_string(val));
+ callback_function(&e);
+ } else if (type == json_type_boolean) {
+ json_jsonc_set_boolean(&e,json_object_get_boolean(val));
+ callback_function(&e);
+ }
+ }
+ }
+
+ } while (++i < end);
+ }
+}
+#else
+
+/**
+ * Walk string
+ *
+ * Set JSON_ENTRY to string and map the values from jsmntok_t.
+ *
+ * @param js the original string
+ * @param t the tokens
+ * @param start the first position
+ * @param e the output structure.
+ *
+ * @return It always return 1
+ */
+size_t json_walk_string(char *js, jsmntok_t *t, size_t start, JSON_ENTRY *e)
+{
+ char old = js[t[start].end];
+ js[t[start].end] = '\0';
+ e->original_string = &js[t[start].start];
+
+ e->type = JSON_STRING;
+ e->data.string = e->original_string;
+ if(e->callback_function) e->callback_function(e);
+ js[t[start].end] = old;
+ return 1;
+}
+
+/**
+ * Walk Primitive
+ *
+ * Define the data type of the string
+ *
+ * @param js the original string
+ * @param t the tokens
+ * @param start the first position
+ * @param e the output structure.
+ *
+ * @return It always return 1
+ */
+size_t json_walk_primitive(char *js, jsmntok_t *t, size_t start, JSON_ENTRY *e)
+{
+ char old = js[t[start].end];
+ js[t[start].end] = '\0';
+ e->original_string = &js[t[start].start];
+
+ switch(e->original_string[0]) {
+ case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7':
+ case '8': case '9': case '-': case '.':
+ e->type = JSON_NUMBER;
+ e->data.number = strtold(e->original_string, NULL);
+ break;
+
+ case 't': case 'T':
+ e->type = JSON_BOOLEAN;
+ e->data.boolean = 1;
+ break;
+
+ case 'f': case 'F':
+ e->type = JSON_BOOLEAN;
+ e->data.boolean = 0;
+ break;
+
+ case 'n': case 'N':
+ default:
+ e->type = JSON_NULL;
+ break;
+ }
+ if(e->callback_function) e->callback_function(e);
+ js[t[start].end] = old;
+ return 1;
+}
+
+/**
+ * Array
+ *
+ * Measure the array length
+ *
+ * @param js the original string
+ * @param t the tokens
+ * @param nest the length of structure t
+ * @param start the first position
+ * @param e the output structure.
+ *
+ * @return It returns the array length
+ */
+size_t json_walk_array(char *js, jsmntok_t *t, size_t nest, size_t start, JSON_ENTRY *e)
+{
+ JSON_ENTRY ne = {
+ .name = "",
+ .fullname = "",
+ .callback_data = NULL,
+ .callback_function = NULL
+ };
+
+ char old = js[t[start].end];
+ js[t[start].end] = '\0';
+ ne.original_string = &js[t[start].start];
+
+ memcpy(&ne, e, sizeof(JSON_ENTRY));
+ ne.type = JSON_ARRAY;
+ ne.data.items = t[start].size;
+ ne.callback_function = NULL;
+ ne.name[0]='\0';
+ ne.fullname[0]='\0';
+ if(e->callback_function) e->callback_function(&ne);
+ js[t[start].end] = old;
+
+ size_t i, init = start, size = t[start].size;
+
+ start++;
+ for(i = 0; i < size ; i++) {
+ ne.pos = i;
+ if (!e->name || !e->fullname || strlen(e->name) > JSON_NAME_LEN - 24 || strlen(e->fullname) > JSON_FULLNAME_LEN -24) {
+ info("JSON: JSON walk_array ignoring element with name:%s fullname:%s",e->name, e->fullname);
+ continue;
+ }
+ sprintf(ne.name, "%s[%lu]", e->name, i);
+ sprintf(ne.fullname, "%s[%lu]", e->fullname, i);
+
+ switch(t[start].type) {
+ case JSMN_PRIMITIVE:
+ start += json_walk_primitive(js, t, start, &ne);
+ break;
+
+ case JSMN_OBJECT:
+ start += json_walk_object(js, t, nest + 1, start, &ne);
+ break;
+
+ case JSMN_ARRAY:
+ start += json_walk_array(js, t, nest + 1, start, &ne);
+ break;
+
+ case JSMN_STRING:
+ start += json_walk_string(js, t, start, &ne);
+ break;
+ }
+ }
+ return start - init;
+}
+
+/**
+ * Object
+ *
+ * Measure the Object length
+ *
+ * @param js the original string
+ * @param t the tokens
+ * @param nest the length of structure t
+ * @param start the first position
+ * @param e the output structure.
+ *
+ * @return It returns the Object length
+ */
+size_t json_walk_object(char *js, jsmntok_t *t, size_t nest, size_t start, JSON_ENTRY *e)
+{
+ JSON_ENTRY ne = {
+ .name = "",
+ .fullname = "",
+ .callback_data = NULL,
+ .callback_function = NULL
+ };
+
+ char old = js[t[start].end];
+ js[t[start].end] = '\0';
+ ne.original_string = &js[t[start].start];
+ memcpy(&ne, e, sizeof(JSON_ENTRY));
+ ne.type = JSON_OBJECT;
+ ne.callback_function = NULL;
+ if(e->callback_function) e->callback_function(&ne);
+ js[t[start].end] = old;
+
+ int key = 1;
+ size_t i, init = start, size = t[start].size;
+
+ start++;
+ for(i = 0; i < size ; i++) {
+ switch(t[start].type) {
+ case JSMN_PRIMITIVE:
+ start += json_walk_primitive(js, t, start, &ne);
+ key = 1;
+ break;
+
+ case JSMN_OBJECT:
+ start += json_walk_object(js, t, nest + 1, start, &ne);
+ key = 1;
+ break;
+
+ case JSMN_ARRAY:
+ start += json_walk_array(js, t, nest + 1, start, &ne);
+ key = 1;
+ break;
+
+ case JSMN_STRING:
+ default:
+ if(key) {
+ int len = t[start].end - t[start].start;
+ if (unlikely(len>JSON_NAME_LEN)) len=JSON_NAME_LEN;
+ strncpy(ne.name, &js[t[start].start], len);
+ ne.name[len] = '\0';
+ len=strlen(e->fullname) + strlen(e->fullname[0]?".":"") + strlen(ne.name);
+ char *c = mallocz((len+1)*sizeof(char));
+ sprintf(c,"%s%s%s", e->fullname, e->fullname[0]?".":"", ne.name);
+ if (unlikely(len>JSON_FULLNAME_LEN)) len=JSON_FULLNAME_LEN;
+ strncpy(ne.fullname, c, len);
+ freez(c);
+ start++;
+ key = 0;
+ }
+ else {
+ start += json_walk_string(js, t, start, &ne);
+ key = 1;
+ }
+ break;
+ }
+ }
+ return start - init;
+}
+#endif
+
+/**
+ * Tree
+ *
+ * Call the correct walk function according its type.
+ *
+ * @param t the json object to work
+ * @param callback_data additional data to be used together the callback function
+ * @param callback_function function used to create a silencer.
+ *
+ * @return It always return 1
+ */
+#ifdef ENABLE_JSONC
+size_t json_walk(json_object *t, void *callback_data, int (*callback_function)(struct json_entry *)) {
+ JSON_ENTRY e;
+
+ e.callback_data = callback_data;
+ enum json_type type;
+ json_object_object_foreach(t, key, val) {
+ type = json_object_get_type(val);
+ if (type == json_type_array) {
+ e.type = JSON_ARRAY;
+ json_jsonc_parse_array(val,NULL,health_silencers_json_read_callback);
+ } else if (type == json_type_object) {
+ e.type = JSON_OBJECT;
+ } else if (type == json_type_string) {
+ json_jsonc_set_string(&e,key,json_object_get_string(val));
+ callback_function(&e);
+ } else if (type == json_type_boolean) {
+ json_jsonc_set_boolean(&e,json_object_get_boolean(val));
+ callback_function(&e);
+ }
+ }
+
+ return 1;
+}
+#else
+/**
+ * Tree
+ *
+ * Call the correct walk function according its type.
+ *
+ * @param js the original string
+ * @param t the tokens
+ * @param callback_data additional data to be used together the callback function
+ * @param callback_function function used to create a silencer.
+ *
+ * @return It always return 1
+ */
+size_t json_walk_tree(char *js, jsmntok_t *t, void *callback_data, int (*callback_function)(struct json_entry *))
+{
+ JSON_ENTRY e = {
+ .name = "",
+ .fullname = "",
+ .callback_data = callback_data,
+ .callback_function = callback_function
+ };
+
+ switch (t[0].type) {
+ case JSMN_OBJECT:
+ e.type = JSON_OBJECT;
+ json_walk_object(js, t, 0, 0, &e);
+ break;
+
+ case JSMN_ARRAY:
+ e.type = JSON_ARRAY;
+ json_walk_array(js, t, 0, 0, &e);
+ break;
+
+ case JSMN_PRIMITIVE:
+ case JSMN_STRING:
+ break;
+ }
+
+ return 1;
+}
+#endif
+
+/**
+ * JSON Parse
+ *
+ * Parse the json message with the callback function
+ *
+ * @param js the string that the callback function will parse
+ * @param callback_data additional data to be used together the callback function
+ * @param callback_function function used to create a silencer.
+ *
+ * @return JSON_OK case everything happend as expected, JSON_CANNOT_PARSE case there were errors in the
+ * parsing procces and JSON_CANNOT_DOWNLOAD case the string given(js) is NULL.
+ */
+int json_parse(char *js, void *callback_data, int (*callback_function)(JSON_ENTRY *))
+{
+ if(js) {
+#ifdef ENABLE_JSONC
+ json_object *tokens = json_tokenise(js);
+#else
+ size_t count;
+ jsmntok_t *tokens = json_tokenise(js, strlen(js), &count);
+#endif
+
+ if(tokens) {
+#ifdef ENABLE_JSONC
+ json_walk(tokens, callback_data, callback_function);
+ json_object_put(tokens);
+#else
+ json_walk_tree(js, tokens, callback_data, callback_function);
+ freez(tokens);
+#endif
+ return JSON_OK;
+ }
+
+ return JSON_CANNOT_PARSE;
+ }
+
+ return JSON_CANNOT_DOWNLOAD;
+}
+
+/*
+int json_test(char *str)
+{
+ return json_parse(str, NULL, json_callback_print);
+}
+ */ \ No newline at end of file
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-03 00:33:18 +0000