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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.
*/
#define _POSIX_C_SOURCE 200809L
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include "scrape.h"
#include "util.h"
#ifndef XCOLLECTORS
#define XCOLLECTORS \
X(conntrack) \
X(cpu) \
X(diskstats) \
X(filefd) \
X(filesystem) \
X(hwmon) \
X(loadavg) \
X(mdstat) \
X(meminfo) \
X(netdev) \
X(pressure) \
X(rapl) \
X(schedstat) \
X(stat) \
X(textfile) \
X(timex) \
X(uname) \
X(vmstat) \
#endif
#define X(c) extern const struct collector c##_collector;
XCOLLECTORS
#undef X
#define X(c) &c##_collector,
static const struct collector *collectors[] = {
XCOLLECTORS
};
#undef X
#define NCOLLECTORS ((unsigned) (sizeof collectors / sizeof *collectors))
struct config {
const char *port;
bool print;
};
const struct config default_config = {
.port = "9100",
.print = false,
};
struct collector_ctx {
unsigned enabled;
const struct collector *coll[NCOLLECTORS];
void *coll_ctx[NCOLLECTORS];
};
static bool initialize(int argc, char *argv[], struct config *cfg, struct collector_ctx *ctx);
int main(int argc, char *argv[]) {
struct config cfg = default_config;
struct collector_ctx ctx;
if (!initialize(argc, argv, &cfg, &ctx))
return 1;
if (cfg.print) {
scrape_print(ctx.enabled, ctx.coll, ctx.coll_ctx);
return 0;
}
scrape_server *server = scrape_listen(cfg.port);
if (!server)
return 1;
scrape_serve(server, ctx.enabled, ctx.coll, ctx.coll_ctx);
scrape_close(server);
return 0;
}
static bool initialize(int argc, char *argv[], struct config *cfg, struct collector_ctx *ctx) {
// parse command-line arguments
enum tristate { flag_off = -1, flag_undef = 0, flag_on = 1 };
enum tristate coll_enabled[NCOLLECTORS];
struct { struct slist *args; struct slist **next_arg; unsigned count; } coll_args[NCOLLECTORS];
for (unsigned i = 0; i < NCOLLECTORS; i++) {
coll_enabled[i] = flag_undef;
coll_args[i].args = 0;
coll_args[i].next_arg = &coll_args[i].args;
coll_args[i].count = 0;
}
enum tristate enabled_default = flag_on;
for (int arg = 1; arg < argc; arg++) {
// check for collector arguments
for (unsigned i = 0; i < NCOLLECTORS; i++) {
size_t name_len = strlen(collectors[i]->name);
if (strncmp(argv[arg], "--", 2) == 0
&& strncmp(argv[arg] + 2, collectors[i]->name, name_len) == 0
&& argv[arg][2 + name_len] == '-') {
char *carg = argv[arg] + 2 + name_len + 1;
if (strcmp(carg, "on") == 0) {
coll_enabled[i] = flag_on;
enabled_default = flag_off;
} else if (strcmp(carg, "off") == 0) {
coll_enabled[i] = flag_off;
} else if (collectors[i]->init && collectors[i]->has_args) {
coll_args[i].next_arg = slist_append(coll_args[i].next_arg, carg);
coll_args[i].count++;
} else {
fprintf(stderr, "unknown argument: %s (collector %s takes no arguments)\n", argv[arg], collectors[i]->name);
return false;
}
goto next_arg;
}
}
// parse any non-collector arguments
// TODO --help
if (strncmp(argv[arg], "--port=", 7) == 0) {
cfg->port = &argv[arg][7];
goto next_arg;
}
if (strncmp(argv[arg], "--stdout", 8) == 0) {
cfg->print = true;
goto next_arg;
}
fprintf(stderr, "unknown argument: %s\n", argv[arg]);
return false;
next_arg: ;
}
unsigned max_args = 1;
for (unsigned i = 0; i < NCOLLECTORS; i++) {
if (coll_enabled[i] == flag_undef)
coll_enabled[i] = enabled_default;
if (coll_enabled[i] == flag_on && coll_args[i].count > max_args)
max_args = coll_args[i].count;
}
// prepare the list of enabled collectors, and initialize them
unsigned coll_argc;
char *coll_argv[max_args + 1];
ctx->enabled = 0;
for (unsigned i = 0; i < NCOLLECTORS; i++) {
if (coll_enabled[i] != flag_on)
continue;
unsigned c = ctx->enabled++;
ctx->coll[c] = collectors[i];
if (collectors[i]->init) {
coll_argc = 0;
for (struct slist *arg = coll_args[i].args; arg && coll_argc < max_args; arg = arg->next)
coll_argv[coll_argc++] = arg->data;
coll_argv[coll_argc] = 0;
ctx->coll_ctx[c] = collectors[i]->init(coll_argc, coll_argv);
if (!ctx->coll_ctx[c]) {
fprintf(stderr, "failed to initialize collector %s\n", collectors[i]->name);
return false;
}
} else {
ctx->coll_ctx[c] = 0;
}
}
return true;
}
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