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#define _POSIX_C_SOURCE 200809L
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "meminfo.h"
#include "util.h"
// size of input buffer for paths and lines
#define BUF_SIZE 256
// prefix to add to /proc/meminfo lines; must fit in BUF_SIZE
#define METRIC_PREFIX "node_memory_"
#define METRIC_PREFIX_LEN (sizeof METRIC_PREFIX - 1)
// suffix to add for " kB" metrics
#define BYTES_SUFFIX "_bytes"
#define BYTES_SUFFIX_LEN (sizeof BYTES_SUFFIX - 1)
static void meminfo_collect(scrape_req *req, void *ctx);
const struct collector meminfo_collector = {
.name = "meminfo",
.collect = meminfo_collect,
};
static void meminfo_collect(scrape_req *req, void *ctx) {
// buffers
char buf[BUF_SIZE] = METRIC_PREFIX;
FILE *f;
// convert /proc/meminfo to metrics format
f = fopen("/proc/meminfo", "r");
if (!f)
return;
while (fgets_line(buf + METRIC_PREFIX_LEN, sizeof buf - METRIC_PREFIX_LEN, f)) {
char *p = buf + METRIC_PREFIX_LEN;
while (*p != '\0' && *p != ':') {
if (!isalnum((unsigned char)*p))
*p = '_';
p++;
}
if (*p != ':')
continue;
char *metric_end = p;
while (metric_end > buf + METRIC_PREFIX_LEN && metric_end[-1] == '_')
--metric_end;
*metric_end = '\0';
do p++; while (*p == ' ');
double value = strtod(p, &p);
if (*p != '\0' && *p != ' ')
continue;
if (*p == ' ') {
do p++; while (*p == ' ');
if (p[0] == 'k' && p[1] == 'B') {
if ((metric_end - buf) + BYTES_SUFFIX_LEN >= sizeof buf)
continue;
strcpy(metric_end, BYTES_SUFFIX);
value *= 1024.0;
}
}
scrape_write(req, buf, 0, value);
}
fclose(f);
}
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