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// SPDX-License-Identifier: GPL-3.0-or-later
#include "parser.h"
#include "collectors/plugins.d/pluginsd_parser.h"
static inline int find_first_keyword(const char *src, char *dst, int dst_size, int (*custom_isspace)(char)) {
const char *s = src, *keyword_start;
while (unlikely(custom_isspace(*s))) s++;
keyword_start = s;
while (likely(*s && !custom_isspace(*s)) && dst_size > 1) {
*dst++ = *s++;
dst_size--;
}
*dst = '\0';
return dst_size == 0 ? 0 : (int) (s - keyword_start);
}
/*
* Initialize a parser
* user : as defined by the user, will be shared across calls
* input : main input stream (auto detect stream -- file, socket, pipe)
* buffer : This is the buffer to be used (if null a buffer of size will be allocated)
* size : buffer size either passed or will be allocated
* If the buffer is auto allocated, it will auto freed when the parser is destroyed
*
*
*/
PARSER *parser_init(void *user, FILE *fp_input, FILE *fp_output, int fd,
PARSER_INPUT_TYPE flags, void *ssl __maybe_unused)
{
PARSER *parser;
parser = callocz(1, sizeof(*parser));
parser->user = user;
parser->fd = fd;
parser->fp_input = fp_input;
parser->fp_output = fp_output;
#ifdef ENABLE_HTTPS
parser->ssl_output = ssl;
#endif
parser->flags = flags;
parser->worker_job_next_id = WORKER_PARSER_FIRST_JOB;
return parser;
}
static inline PARSER_KEYWORD *parser_find_keyword(PARSER *parser, const char *command) {
uint32_t hash = parser_hash_function(command);
uint32_t slot = hash % PARSER_KEYWORDS_HASHTABLE_SIZE;
PARSER_KEYWORD *t = parser->keywords.hashtable[slot];
if(likely(t && strcmp(t->keyword, command) == 0))
return t;
return NULL;
}
/*
* Add a keyword and the corresponding function that will be called
* Multiple functions may be added
* Input : keyword
* : callback function
* : flags
* Output: > 0 registered function number
* : 0 Error
*/
void parser_add_keyword(PARSER *parser, char *keyword, keyword_function func) {
if(unlikely(!parser || !keyword || !*keyword || !func))
fatal("PARSER: invalid parameters");
PARSER_KEYWORD *t = callocz(1, sizeof(*t));
t->worker_job_id = parser->worker_job_next_id++;
t->keyword = strdupz(keyword);
t->func = func;
uint32_t hash = parser_hash_function(keyword);
uint32_t slot = hash % PARSER_KEYWORDS_HASHTABLE_SIZE;
if(unlikely(parser->keywords.hashtable[slot]))
fatal("PARSER: hashtable collision between keyword '%s' and '%s' on slot %u. "
"Change the hashtable size and / or the hashing function. "
"Run the unit test to find the optimal values.",
parser->keywords.hashtable[slot]->keyword,
t->keyword,
slot
);
parser->keywords.hashtable[slot] = t;
worker_register_job_name(t->worker_job_id, t->keyword);
}
/*
* Cleanup a previously allocated parser
*/
void parser_destroy(PARSER *parser)
{
if (unlikely(!parser))
return;
dictionary_destroy(parser->inflight.functions);
// Remove keywords
for(size_t i = 0 ; i < PARSER_KEYWORDS_HASHTABLE_SIZE; i++) {
PARSER_KEYWORD *t = parser->keywords.hashtable[i];
if (t) {
freez(t->keyword);
freez(t);
}
}
freez(parser);
}
/*
* Fetch the next line to process
*
*/
int parser_next(PARSER *parser, char *buffer, size_t buffer_size)
{
char *tmp = fgets(buffer, (int)buffer_size, (FILE *)parser->fp_input);
if (unlikely(!tmp)) {
if (feof((FILE *)parser->fp_input))
error("PARSER: read failed: end of file");
else if (ferror((FILE *)parser->fp_input))
error("PARSER: read failed: input error");
else
error("PARSER: read failed: unknown error");
return 1;
}
return 0;
}
/*
* Takes an initialized parser object that has an unprocessed entry (by calling parser_next)
* and if it contains a valid keyword, it will execute all the callbacks
*
*/
inline int parser_action(PARSER *parser, char *input)
{
parser->line++;
if(unlikely(parser->flags & PARSER_DEFER_UNTIL_KEYWORD)) {
char command[PLUGINSD_LINE_MAX + 1];
bool has_keyword = find_first_keyword(input, command, PLUGINSD_LINE_MAX, pluginsd_space);
if(!has_keyword || strcmp(command, parser->defer.end_keyword) != 0) {
if(parser->defer.response) {
buffer_strcat(parser->defer.response, input);
if(buffer_strlen(parser->defer.response) > 10 * 1024 * 1024) {
// more than 10MB of data
// a bad plugin that did not send the end_keyword
internal_error(true, "PLUGINSD: deferred response is too big (%zu bytes). Stopping this plugin.", buffer_strlen(parser->defer.response));
return 1;
}
}
return 0;
}
else {
// call the action
parser->defer.action(parser, parser->defer.action_data);
// empty everything
parser->defer.action = NULL;
parser->defer.action_data = NULL;
parser->defer.end_keyword = NULL;
parser->defer.response = NULL;
parser->flags &= ~PARSER_DEFER_UNTIL_KEYWORD;
}
return 0;
}
char *words[PLUGINSD_MAX_WORDS];
size_t num_words = pluginsd_split_words(input, words, PLUGINSD_MAX_WORDS);
const char *command = get_word(words, num_words, 0);
if(unlikely(!command))
return 0;
PARSER_RC rc;
PARSER_KEYWORD *t = parser_find_keyword(parser, command);
if(likely(t)) {
worker_is_busy(t->worker_job_id);
rc = (*t->func)(words, num_words, parser->user);
worker_is_idle();
}
else
rc = PARSER_RC_ERROR;
#ifdef NETDATA_INTERNAL_CHECKS
if(rc == PARSER_RC_ERROR) {
BUFFER *wb = buffer_create(PLUGINSD_LINE_MAX, NULL);
for(size_t i = 0; i < num_words ;i++) {
if(i) buffer_fast_strcat(wb, " ", 1);
buffer_fast_strcat(wb, "\"", 1);
const char *s = get_word(words, num_words, i);
buffer_strcat(wb, s?s:"");
buffer_fast_strcat(wb, "\"", 1);
}
internal_error(true, "PLUGINSD: parser_action('%s') failed on line %zu: { %s } (quotes added to show parsing)",
command, parser->line, buffer_tostring(wb));
buffer_free(wb);
}
#endif
return (rc == PARSER_RC_ERROR || rc == PARSER_RC_STOP);
}
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