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/*
* Copyright 2018 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "scrape.h"
#include "util.h"
// size of input buffer for paths and lines
#define BUF_SIZE 256
static void stat_collect(scrape_req *req, void *ctx);
const struct collector stat_collector = {
.name = "stat",
.collect = stat_collect,
};
static const struct {
const char *name;
const char *key;
unsigned key_len;
} metrics[] = {
{ .name = "node_boot_time_seconds", .key = "btime ", .key_len = 6 },
{ .name = "node_context_switches_total", .key = "ctxt ", .key_len = 5 },
{ .name = "node_forks_total", .key = "processes ", .key_len = 10 },
{ .name = "node_intr_total", .key = "intr ", .key_len = 5 },
{ .name = "node_procs_blocked", .key = "procs_blocked ", .key_len = 14 },
{ .name = "node_procs_running", .key = "procs_running ", .key_len = 14 },
};
#define NMETRICS (sizeof metrics / sizeof *metrics)
static void stat_collect(scrape_req *req, void *ctx) {
(void) ctx;
// buffers
char buf[BUF_SIZE];
FILE *f;
// scan /proc/stat for metrics
f = fopen(PATH("/proc/stat"), "r");
if (!f)
return;
while (fgets_line(buf, sizeof buf, f)) {
for (size_t m = 0; m < NMETRICS; m++) {
if (strncmp(buf, metrics[m].key, metrics[m].key_len) != 0)
continue;
char *end;
double d = strtod(buf + metrics[m].key_len, &end);
if (*end != '\0' && *end != ' ' && *end != '\n')
continue;
scrape_write(req, metrics[m].name, 0, d);
break;
}
}
fclose(f);
}
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