mirror of
https://github.com/netdata/netdata.git
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7e9a2cbb0b
* stream chart labels * update stream protocol to 4 * only send CLABEL_COMMIT when there are labels * mark host as UNUSED * log error for stray CLABEL_COMMIT * remove commented define
322 lines
9.1 KiB
C
322 lines
9.1 KiB
C
// SPDX-License-Identifier: GPL-3.0-or-later
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#include "parser.h"
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static inline int find_keyword(char *str, char *keyword, int max_size, int (*custom_isspace)(char))
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{
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char *s = str, *keyword_start;
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while (unlikely(custom_isspace(*s))) s++;
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keyword_start = s;
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while (likely(*s && !custom_isspace(*s)) && max_size > 0) {
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*keyword++ = *s++;
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max_size--;
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}
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*keyword = '\0';
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return max_size == 0 ? 0 : (int) (s - keyword_start);
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}
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/*
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* Initialize a parser
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* user : as defined by the user, will be shared across calls
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* input : main input stream (auto detect stream -- file, socket, pipe)
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* buffer : This is the buffer to be used (if null a buffer of size will be allocated)
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* size : buffer size either passed or will be allocated
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* If the buffer is auto allocated, it will auto freed when the parser is destroyed
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*
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*
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*/
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PARSER *parser_init(RRDHOST *host, void *user, void *input, PARSER_INPUT_TYPE flags)
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{
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PARSER *parser;
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parser = callocz(1, sizeof(*parser));
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if (unlikely(!parser))
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return NULL;
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parser->plugins_action = callocz(1, sizeof(PLUGINSD_ACTION));
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if (unlikely(!parser->plugins_action)) {
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freez(parser);
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return NULL;
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}
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parser->user = user;
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parser->input = input;
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parser->flags = flags;
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parser->host = host;
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#ifdef ENABLE_HTTPS
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parser->bytesleft = 0;
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parser->readfrom = NULL;
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#endif
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if (unlikely(!(flags & PARSER_NO_PARSE_INIT))) {
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int rc = parser_add_keyword(parser, PLUGINSD_KEYWORD_FLUSH, pluginsd_flush);
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rc += parser_add_keyword(parser, PLUGINSD_KEYWORD_CHART, pluginsd_chart);
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rc += parser_add_keyword(parser, PLUGINSD_KEYWORD_DIMENSION, pluginsd_dimension);
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rc += parser_add_keyword(parser, PLUGINSD_KEYWORD_DISABLE, pluginsd_disable);
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rc += parser_add_keyword(parser, PLUGINSD_KEYWORD_VARIABLE, pluginsd_variable);
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rc += parser_add_keyword(parser, PLUGINSD_KEYWORD_LABEL, pluginsd_label);
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rc += parser_add_keyword(parser, PLUGINSD_KEYWORD_OVERWRITE, pluginsd_overwrite);
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rc += parser_add_keyword(parser, PLUGINSD_KEYWORD_END, pluginsd_end);
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rc += parser_add_keyword(parser, "CLABEL_COMMIT", pluginsd_clabel_commit);
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rc += parser_add_keyword(parser, "CLABEL", pluginsd_clabel);
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rc += parser_add_keyword(parser, PLUGINSD_KEYWORD_BEGIN, pluginsd_begin);
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rc += parser_add_keyword(parser, "SET", pluginsd_set);
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}
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return parser;
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}
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/*
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* Push a new line into the parsing stream
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*
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* This line will be the next one to process ie the next fetch will get this one
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*
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*/
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int parser_push(PARSER *parser, char *line)
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{
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PARSER_DATA *tmp_parser_data;
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if (unlikely(!parser))
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return 1;
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if (unlikely(!line))
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return 0;
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tmp_parser_data = callocz(1, sizeof(*tmp_parser_data));
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tmp_parser_data->line = strdupz(line);
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tmp_parser_data->next = parser->data;
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parser->data = tmp_parser_data;
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return 0;
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}
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/*
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* Add a keyword and the corresponding function that will be called
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* Multiple functions may be added
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* Input : keyword
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* : callback function
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* : flags
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* Output: > 0 registered function number
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* : 0 Error
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*/
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int parser_add_keyword(PARSER *parser, char *keyword, keyword_function func)
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{
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PARSER_KEYWORD *tmp_keyword;
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if (strcmp(keyword, "_read") == 0) {
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parser->read_function = (void *) func;
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return 0;
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}
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if (strcmp(keyword, "_eof") == 0) {
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parser->eof_function = (void *) func;
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return 0;
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}
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if (strcmp(keyword, "_unknown") == 0) {
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parser->unknown_function = (void *) func;
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return 0;
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}
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uint32_t keyword_hash = simple_hash(keyword);
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tmp_keyword = parser->keyword;
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while (tmp_keyword) {
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if (tmp_keyword->keyword_hash == keyword_hash && (!strcmp(tmp_keyword->keyword, keyword))) {
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if (tmp_keyword->func_no == PARSER_MAX_CALLBACKS)
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return 0;
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tmp_keyword->func[tmp_keyword->func_no++] = (void *) func;
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return tmp_keyword->func_no;
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}
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tmp_keyword = tmp_keyword->next;
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}
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tmp_keyword = callocz(1, sizeof(*tmp_keyword));
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tmp_keyword->keyword = strdupz(keyword);
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tmp_keyword->keyword_hash = keyword_hash;
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tmp_keyword->func[tmp_keyword->func_no++] = (void *) func;
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tmp_keyword->next = parser->keyword;
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parser->keyword = tmp_keyword;
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return tmp_keyword->func_no;
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}
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/*
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* Cleanup a previously allocated parser
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*/
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void parser_destroy(PARSER *parser)
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{
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if (unlikely(!parser))
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return;
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PARSER_KEYWORD *tmp_keyword, *tmp_keyword_next;
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PARSER_DATA *tmp_parser_data, *tmp_parser_data_next;
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// Remove keywords
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tmp_keyword = parser->keyword;
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while (tmp_keyword) {
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tmp_keyword_next = tmp_keyword->next;
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freez(tmp_keyword->keyword);
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freez(tmp_keyword);
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tmp_keyword = tmp_keyword_next;
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}
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// Remove pushed data if any
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tmp_parser_data = parser->data;
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while (tmp_parser_data) {
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tmp_parser_data_next = tmp_parser_data->next;
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freez(tmp_parser_data->line);
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freez(tmp_parser_data);
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tmp_parser_data = tmp_parser_data_next;
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}
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freez(parser->plugins_action);
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freez(parser);
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return;
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}
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/*
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* Fetch the next line to process
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*
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*/
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int parser_next(PARSER *parser)
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{
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char *tmp = NULL;
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if (unlikely(!parser))
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return 1;
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parser->flags &= ~(PARSER_INPUT_PROCESSED);
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PARSER_DATA *tmp_parser_data = parser->data;
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if (unlikely(tmp_parser_data)) {
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strncpyz(parser->buffer, tmp_parser_data->line, PLUGINSD_LINE_MAX);
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parser->data = tmp_parser_data->next;
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freez(tmp_parser_data->line);
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freez(tmp_parser_data);
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return 0;
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}
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if (unlikely(parser->read_function))
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tmp = parser->read_function(parser->buffer, PLUGINSD_LINE_MAX, parser->input);
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else
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tmp = fgets(parser->buffer, PLUGINSD_LINE_MAX, (FILE *)parser->input);
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if (unlikely(!tmp)) {
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if (unlikely(parser->eof_function)) {
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int rc = parser->eof_function(parser->input);
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error("read failed: user defined function returned %d", rc);
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}
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else {
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if (feof((FILE *)parser->input))
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error("read failed: end of file");
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else if (ferror((FILE *)parser->input))
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error("read failed: input error");
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else
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error("read failed: unknown error");
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}
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return 1;
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}
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return 0;
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}
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/*
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* Takes an initialized parser object that has an unprocessed entry (by calling parser_next)
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* and if it contains a valid keyword, it will execute all the callbacks
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*
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*/
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inline int parser_action(PARSER *parser, char *input)
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{
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PARSER_RC rc = PARSER_RC_OK;
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char *words[PLUGINSD_MAX_WORDS] = { NULL };
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char command[PLUGINSD_LINE_MAX];
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keyword_function action_function;
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keyword_function *action_function_list = NULL;
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if (unlikely(!parser))
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return 1;
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parser->recover_location[0] = 0x0;
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// if not direct input check if we have reprocessed this
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if (unlikely(!input && parser->flags & PARSER_INPUT_PROCESSED))
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return 0;
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PARSER_KEYWORD *tmp_keyword = parser->keyword;
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if (unlikely(!tmp_keyword)) {
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return 1;
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}
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if (unlikely(!input))
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input = parser->buffer;
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if (unlikely(!find_keyword(input, command, PLUGINSD_LINE_MAX, pluginsd_space)))
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return 0;
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if ((parser->flags & PARSER_INPUT_ORIGINAL) == PARSER_INPUT_ORIGINAL)
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pluginsd_split_words(input, words, PLUGINSD_MAX_WORDS, parser->recover_input, parser->recover_location, PARSER_MAX_RECOVER_KEYWORDS);
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else
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pluginsd_split_words(input, words, PLUGINSD_MAX_WORDS, NULL, NULL, 0);
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uint32_t command_hash = simple_hash(command);
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while(tmp_keyword) {
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if (command_hash == tmp_keyword->keyword_hash &&
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(!strcmp(command, tmp_keyword->keyword))) {
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action_function_list = &tmp_keyword->func[0];
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break;
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}
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tmp_keyword = tmp_keyword->next;
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}
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if (unlikely(!action_function_list)) {
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if (unlikely(parser->unknown_function))
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rc = parser->unknown_function(words, parser->user, NULL);
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else
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rc = PARSER_RC_ERROR;
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#ifdef NETDATA_INTERNAL_CHECKS
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error("Unknown keyword [%s]", input);
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#endif
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}
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else {
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while ((action_function = *action_function_list) != NULL) {
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rc = action_function(words, parser->user, parser->plugins_action);
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if (unlikely(rc == PARSER_RC_ERROR || rc == PARSER_RC_STOP))
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break;
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action_function_list++;
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}
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}
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if (likely(input == parser->buffer))
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parser->flags |= PARSER_INPUT_PROCESSED;
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return (rc == PARSER_RC_ERROR);
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}
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inline int parser_recover_input(PARSER *parser)
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{
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if (unlikely(!parser))
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return 1;
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for(int i=0; i < PARSER_MAX_RECOVER_KEYWORDS && parser->recover_location[i]; i++)
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*(parser->recover_location[i]) = parser->recover_input[i];
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parser->recover_location[0] = 0x0;
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return 0;
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}
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