netdata/parser/parser.c at master · sourcecodes2/netdata · GitHub

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// SPDX-License-Identifier: GPL-3.0-or-later

#include "parser.h"

static inline int find_keyword(char *str, char *keyword, int max_size, int (*custom_isspace)(char))

{

char *s = str, *keyword_start;

while (unlikely(custom_isspace(*s))) s++;

keyword_start = s;

while (likely(*s && !custom_isspace(*s)) && max_size > 0) {

*keyword++ = *s++;

max_size--;

}

*keyword = '\0';

return max_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(RRDHOST *host, void *user, void *input, PARSER_INPUT_TYPE flags)

{

PARSER *parser;

parser = callocz(1, sizeof(*parser));

if (unlikely(!parser))

return NULL;

parser->plugins_action = callocz(1, sizeof(PLUGINSD_ACTION));

if (unlikely(!parser->plugins_action)) {

freez(parser);

return NULL;

}

parser->user = user;

parser->input = input;

parser->flags = flags;

parser->host = host;

#ifdef ENABLE_HTTPS

parser->bytesleft = 0;

parser->readfrom = NULL;

#endif

if (unlikely(!(flags & PARSER_NO_PARSE_INIT))) {

int rc = parser_add_keyword(parser, PLUGINSD_KEYWORD_FLUSH, pluginsd_flush);

rc += parser_add_keyword(parser, PLUGINSD_KEYWORD_CHART, pluginsd_chart);

rc += parser_add_keyword(parser, PLUGINSD_KEYWORD_DIMENSION, pluginsd_dimension);

rc += parser_add_keyword(parser, PLUGINSD_KEYWORD_DISABLE, pluginsd_disable);

rc += parser_add_keyword(parser, PLUGINSD_KEYWORD_VARIABLE, pluginsd_variable);

rc += parser_add_keyword(parser, PLUGINSD_KEYWORD_LABEL, pluginsd_label);

rc += parser_add_keyword(parser, PLUGINSD_KEYWORD_OVERWRITE, pluginsd_overwrite);

rc += parser_add_keyword(parser, PLUGINSD_KEYWORD_END, pluginsd_end);

rc += parser_add_keyword(parser, "CLABEL_COMMIT", pluginsd_clabel_commit);

rc += parser_add_keyword(parser, "CLABEL", pluginsd_clabel);

rc += parser_add_keyword(parser, PLUGINSD_KEYWORD_BEGIN, pluginsd_begin);

rc += parser_add_keyword(parser, "SET", pluginsd_set);

}

return parser;

}

* Push a new line into the parsing stream

* This line will be the next one to process ie the next fetch will get this one

int parser_push(PARSER *parser, char *line)

{

PARSER_DATA *tmp_parser_data;

if (unlikely(!parser))

return 1;

if (unlikely(!line))

return 0;

tmp_parser_data = callocz(1, sizeof(*tmp_parser_data));

tmp_parser_data->line = strdupz(line);

tmp_parser_data->next = parser->data;

parser->data = tmp_parser_data;

return 0;

}

* 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

int parser_add_keyword(PARSER *parser, char *keyword, keyword_function func)

{

PARSER_KEYWORD *tmp_keyword;

if (strcmp(keyword, "_read") == 0) {

parser->read_function = (void *) func;

return 0;

}

if (strcmp(keyword, "_eof") == 0) {

parser->eof_function = (void *) func;

return 0;

}

if (strcmp(keyword, "_unknown") == 0) {

parser->unknown_function = (void *) func;

return 0;

}

uint32_t keyword_hash = simple_hash(keyword);

tmp_keyword = parser->keyword;

while (tmp_keyword) {

if (tmp_keyword->keyword_hash == keyword_hash && (!strcmp(tmp_keyword->keyword, keyword))) {

if (tmp_keyword->func_no == PARSER_MAX_CALLBACKS)

return 0;

tmp_keyword->func[tmp_keyword->func_no++] = (void *) func;

return tmp_keyword->func_no;

}

tmp_keyword = tmp_keyword->next;

}

tmp_keyword = callocz(1, sizeof(*tmp_keyword));

tmp_keyword->keyword = strdupz(keyword);

tmp_keyword->keyword_hash = keyword_hash;

tmp_keyword->func[tmp_keyword->func_no++] = (void *) func;

tmp_keyword->next = parser->keyword;

parser->keyword = tmp_keyword;

return tmp_keyword->func_no;

}

* Cleanup a previously allocated parser

void parser_destroy(PARSER *parser)

{

if (unlikely(!parser))

return;

PARSER_KEYWORD *tmp_keyword, *tmp_keyword_next;

PARSER_DATA *tmp_parser_data, *tmp_parser_data_next;

// Remove keywords

tmp_keyword = parser->keyword;

while (tmp_keyword) {

tmp_keyword_next = tmp_keyword->next;

freez(tmp_keyword->keyword);

freez(tmp_keyword);

tmp_keyword = tmp_keyword_next;

}

// Remove pushed data if any

tmp_parser_data = parser->data;

while (tmp_parser_data) {

tmp_parser_data_next = tmp_parser_data->next;

freez(tmp_parser_data->line);

freez(tmp_parser_data);

tmp_parser_data = tmp_parser_data_next;

}

freez(parser->plugins_action);

freez(parser);

return;

}

* Fetch the next line to process

int parser_next(PARSER *parser)

{

char *tmp = NULL;

if (unlikely(!parser))

return 1;

parser->flags &= ~(PARSER_INPUT_PROCESSED);

PARSER_DATA *tmp_parser_data = parser->data;

if (unlikely(tmp_parser_data)) {

strncpyz(parser->buffer, tmp_parser_data->line, PLUGINSD_LINE_MAX);

parser->data = tmp_parser_data->next;

freez(tmp_parser_data->line);

freez(tmp_parser_data);

return 0;

}

if (unlikely(parser->read_function))

tmp = parser->read_function(parser->buffer, PLUGINSD_LINE_MAX, parser->input);

else

tmp = fgets(parser->buffer, PLUGINSD_LINE_MAX, (FILE *)parser->input);

if (unlikely(!tmp)) {

if (unlikely(parser->eof_function)) {

int rc = parser->eof_function(parser->input);

error("read failed: user defined function returned %d", rc);

}

else {

if (feof((FILE *)parser->input))

error("read failed: end of file");

else if (ferror((FILE *)parser->input))

error("read failed: input error");

else

error("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_RC rc = PARSER_RC_OK;

char *words[PLUGINSD_MAX_WORDS] = { NULL };

char command[PLUGINSD_LINE_MAX];

keyword_function action_function;

keyword_function *action_function_list = NULL;

if (unlikely(!parser))

return 1;

parser->recover_location[0] = 0x0;

// if not direct input check if we have reprocessed this

if (unlikely(!input && parser->flags & PARSER_INPUT_PROCESSED))

return 0;

PARSER_KEYWORD *tmp_keyword = parser->keyword;

if (unlikely(!tmp_keyword)) {

return 1;

}

if (unlikely(!input))

input = parser->buffer;

if (unlikely(!find_keyword(input, command, PLUGINSD_LINE_MAX, pluginsd_space)))

return 0;

if ((parser->flags & PARSER_INPUT_ORIGINAL) == PARSER_INPUT_ORIGINAL)

pluginsd_split_words(input, words, PLUGINSD_MAX_WORDS, parser->recover_input, parser->recover_location, PARSER_MAX_RECOVER_KEYWORDS);

else

pluginsd_split_words(input, words, PLUGINSD_MAX_WORDS, NULL, NULL, 0);

uint32_t command_hash = simple_hash(command);

while(tmp_keyword) {

if (command_hash == tmp_keyword->keyword_hash &&

(!strcmp(command, tmp_keyword->keyword))) {

action_function_list = &tmp_keyword->func[0];

break;

}

tmp_keyword = tmp_keyword->next;

}

if (unlikely(!action_function_list)) {

if (unlikely(parser->unknown_function))

rc = parser->unknown_function(words, parser->user, NULL);

else

rc = PARSER_RC_ERROR;

#ifdef NETDATA_INTERNAL_CHECKS

error("Unknown keyword [%s]", input);

#endif

}

else {

while ((action_function = *action_function_list) != NULL) {

rc = action_function(words, parser->user, parser->plugins_action);

if (unlikely(rc == PARSER_RC_ERROR || rc == PARSER_RC_STOP))

break;

action_function_list++;

}

if (likely(input == parser->buffer))

parser->flags |= PARSER_INPUT_PROCESSED;

return (rc == PARSER_RC_ERROR);

}

inline int parser_recover_input(PARSER *parser)

{

if (unlikely(!parser))

return 1;

for(int i=0; i < PARSER_MAX_RECOVER_KEYWORDS && parser->recover_location[i]; i++)

*(parser->recover_location[i]) = parser->recover_input[i];

parser->recover_location[0] = 0x0;

return 0;

}

netdata/parser/parser.c at master · sourcecodes2/netdata · GitHub

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