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#include <stdbool.h>
#include <dirent.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include "textfile.h"
#include "util.h"
// TODO: check default
#define DEFAULT_DIR "/var/lib/prometheus-node-exporter"
void *textfile_init(int argc, char *argv[]);
void textfile_collect(scrape_req *req, void *ctx);
const struct collector textfile_collector = {
.name = "textfile",
.collect = textfile_collect,
.init = textfile_init,
.has_args = true,
};
void *textfile_init(int argc, char *argv[]) {
char *dir = DEFAULT_DIR;
for (int arg = 0; arg < argc; arg++) {
if (strncmp(argv[arg], "dir=", 4) == 0) {
dir = &argv[arg][4];
} else {
fprintf(stderr, "unknown argument for textfile collector: %s", argv[arg]);
return 0;
}
}
return dir;
}
void textfile_collect(scrape_req *req, void *ctx) {
const char *dir = ctx;
DIR *d = opendir(dir);
if (!d)
return;
struct dirent *dent;
char buf[4096];
while ((dent = readdir(d))) {
size_t name_len = strlen(dent->d_name);
if (name_len < 6 || strcmp(dent->d_name + name_len - 5, ".prom") != 0)
continue;
snprintf(buf, sizeof buf, "%s/%s", dir, dent->d_name);
FILE *f = fopen(buf, "r");
if (!f)
continue;
bool has_newline = true;
size_t len;
while ((len = fread(buf, 1, sizeof buf, f)) > 0) {
scrape_write_raw(req, buf, len);
has_newline = buf[len - 1] == '\n';
}
if (!has_newline)
scrape_write_raw(req, (char[]){'\n'}, 1);
fclose(f);
}
closedir(d);
}
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