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#include <uwsgi.h>
extern struct uwsgi_server uwsgi;
static struct uwsgi_rrdtool {
void *lib;
char *lib_name;
int (*create)(int, char **);
int (*update)(int, char **);
int freq;
char *update_area;
struct uwsgi_string_list *directory;
struct uwsgi_stats_pusher *pusher;
} u_rrd;
static struct uwsgi_option rrdtool_options[] = {
{"rrdtool", required_argument, 0, "store rrd files in the specified directory", uwsgi_opt_add_string_list, &u_rrd.directory, UWSGI_OPT_MASTER|UWSGI_OPT_METRICS},
{"rrdtool-freq", required_argument, 0, "set collect frequency", uwsgi_opt_set_int, &u_rrd.freq, 0},
{"rrdtool-lib", required_argument, 0, "set the name of rrd library (default: librrd.so)", uwsgi_opt_set_str, &u_rrd.lib_name, 0},
{0, 0, 0, 0, 0, 0, 0},
};
static int rrdtool_init() {
if (!u_rrd.lib_name) {
u_rrd.lib_name = "librrd.so";
}
u_rrd.lib = dlopen(u_rrd.lib_name, RTLD_LAZY);
if (!u_rrd.lib) return -1;
u_rrd.create = dlsym(u_rrd.lib, "rrd_create");
if (!u_rrd.create) {
dlclose(u_rrd.lib);
return -1;
}
u_rrd.update = dlsym(u_rrd.lib, "rrd_update");
if (!u_rrd.update) {
dlclose(u_rrd.lib);
return -1;
}
uwsgi_log_initial("*** RRDtool library available at %p ***\n", u_rrd.lib);
return 0;
}
/*
create .rrd files if needed
*/
static void rrdtool_post_init() {
if (!u_rrd.create) return;
// do not waste time if no --rrdtool option is defined
if (!u_rrd.directory) return;
if (!u_rrd.freq) u_rrd.freq = 300;
char *argv[7];
argv[0] = "create";
// create RRA
argv[3] = "RRA:AVERAGE:0.5:1:288" ;
argv[4] = "RRA:AVERAGE:0.5:12:168" ;
argv[5] = "RRA:AVERAGE:0.5:288:31" ;
argv[6] = "RRA:AVERAGE:0.5:2016:52";
struct uwsgi_string_list *usl = NULL;
uwsgi_foreach(usl, u_rrd.directory) {
char *dir = uwsgi_expand_path(usl->value, strlen(usl->value), NULL);
if (!dir) {
uwsgi_error("rrdtool_post_init()/uwsgi_expand_path()");
exit(1);
}
struct uwsgi_metric *um = uwsgi.metrics;
// here locking is useless, but maybe in the future we could move this part
// somewhere else
int created = 0;
uwsgi_rlock(uwsgi.metrics_lock);
while(um) {
char *filename = uwsgi_concat4(dir, "/", um->name, ".rrd");
if (!uwsgi_file_exists(filename)) {
argv[1] = filename;
if (um->type == UWSGI_METRIC_GAUGE) {
argv[2] = "DS:metric:GAUGE:600:0:U";
}
else {
argv[2] = "DS:metric:DERIVE:600:0:U";
}
if (u_rrd.create(7, argv)) {
uwsgi_log("unable to create rrd file for metric \"%s\"\n", um->name);
uwsgi_error("rrd_create()");
exit(1);
}
created++;
}
free(filename);
um = um->next;
}
uwsgi_rwunlock(uwsgi.metrics_lock);
uwsgi_log("created %d new rrd files in %s\n", created, dir);
struct uwsgi_stats_pusher_instance *uspi = uwsgi_stats_pusher_add(u_rrd.pusher, NULL);
uspi->freq = u_rrd.freq;
uspi->data = dir;
// no need to generate the json
uspi->raw=1;
}
}
static void rrdtool_push(struct uwsgi_stats_pusher_instance *uspi, time_t now, char *json, size_t json_len) {
if (!u_rrd.update) return ;
// standard stats pusher
if (!uspi->data) {
if (!uspi->arg) {
uwsgi_log("invalid rrdtool stats pusher syntax\n");
exit(1);
}
uspi->data = uwsgi_expand_path(uspi->arg, strlen(uspi->arg), NULL);
if (!uspi->data) {
uwsgi_error("rrdtool_push()/uwsgi_expand_path()");
exit(1);
}
if (!u_rrd.freq) u_rrd.freq = 300;
uspi->freq = u_rrd.freq;
}
// 1k will be more than enough
char buf[1024];
char *argv[3];
argv[0] = "update";
struct uwsgi_metric *um = uwsgi.metrics;
while(um) {
uwsgi_rlock(uwsgi.metrics_lock);
int ret = snprintf(buf, 1024, "N:%lld", (long long) (*um->value));
uwsgi_rwunlock(uwsgi.metrics_lock);
if (um->reset_after_push){
uwsgi_wlock(uwsgi.metrics_lock);
*um->value = um->initial_value;
uwsgi_rwunlock(uwsgi.metrics_lock);
}
if (ret < 3 || ret >= 1024) {
uwsgi_log("unable to update rrdtool metric for %s\n", um->name);
goto next;
}
char *filename = uwsgi_concat4(uspi->data, "/", um->name, ".rrd");
argv[1] = filename;
argv[2] = buf;
if (u_rrd.update(3, argv)) {
uwsgi_log_verbose("ERROR: rrd_update(\"%s\", \"%s\")\n", argv[1], argv[2]);
}
free(filename);
next:
um = um->next;
}
}
static void rrdtool_register() {
u_rrd.pusher = uwsgi_register_stats_pusher("rrdtool", rrdtool_push);
u_rrd.pusher->raw = 1;
}
struct uwsgi_plugin rrdtool_plugin = {
.name = "rrdtool",
.options = rrdtool_options,
.on_load = rrdtool_register,
// this is the best phase to create rrd files (if needed)
.preinit_apps = rrdtool_post_init,
// here we get pointers to rrdtool functions
.init = rrdtool_init,
};
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