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-rw-r--r--src/backend_prometheus.c397
1 files changed, 397 insertions, 0 deletions
diff --git a/src/backend_prometheus.c b/src/backend_prometheus.c
new file mode 100644
index 000000000..88ec2c65b
--- /dev/null
+++ b/src/backend_prometheus.c
@@ -0,0 +1,397 @@
+#include "common.h"
+
+// ----------------------------------------------------------------------------
+// PROMETHEUS
+// /api/v1/allmetrics?format=prometheus
+
+static struct prometheus_server {
+ const char *server;
+ uint32_t hash;
+ time_t last_access;
+ struct prometheus_server *next;
+} *prometheus_server_root = NULL;
+
+static inline time_t prometheus_server_last_access(const char *server, time_t now) {
+ uint32_t hash = simple_hash(server);
+
+ struct prometheus_server *ps;
+ for(ps = prometheus_server_root; ps ;ps = ps->next) {
+ if (hash == ps->hash && !strcmp(server, ps->server)) {
+ time_t last = ps->last_access;
+ ps->last_access = now;
+ return last;
+ }
+ }
+
+ ps = callocz(1, sizeof(struct prometheus_server));
+ ps->server = strdupz(server);
+ ps->hash = hash;
+ ps->last_access = now;
+ ps->next = prometheus_server_root;
+ prometheus_server_root = ps;
+
+ return 0;
+}
+
+static inline size_t prometheus_name_copy(char *d, const char *s, size_t usable) {
+ size_t n;
+
+ for(n = 0; *s && n < usable ; d++, s++, n++) {
+ register char c = *s;
+
+ if(!isalnum(c)) *d = '_';
+ else *d = c;
+ }
+ *d = '\0';
+
+ return n;
+}
+
+static inline size_t prometheus_label_copy(char *d, const char *s, size_t usable) {
+ size_t n;
+
+ // make sure we can escape one character without overflowing the buffer
+ usable--;
+
+ for(n = 0; *s && n < usable ; d++, s++, n++) {
+ register char c = *s;
+
+ if(unlikely(c == '"' || c == '\\' || c == '\n')) {
+ *d++ = '\\';
+ n++;
+ }
+ *d = c;
+ }
+ *d = '\0';
+
+ return n;
+}
+
+static inline char *prometheus_units_copy(char *d, const char *s, size_t usable) {
+ const char *sorig = s;
+ char *ret = d;
+ size_t n;
+
+ *d++ = '_';
+ for(n = 1; *s && n < usable ; d++, s++, n++) {
+ register char c = *s;
+
+ if(!isalnum(c)) *d = '_';
+ else *d = c;
+ }
+
+ if(n == 2 && sorig[0] == '%') {
+ n = 0;
+ d = ret;
+ s = "_percent";
+ for( ; *s && n < usable ; n++) *d++ = *s++;
+ }
+ else if(n > 3 && sorig[n-3] == '/' && sorig[n-2] == 's') {
+ n = n - 2;
+ d -= 2;
+ s = "_persec";
+ for( ; *s && n < usable ; n++) *d++ = *s++;
+ }
+
+ *d = '\0';
+
+ return ret;
+}
+
+
+#define PROMETHEUS_ELEMENT_MAX 256
+#define PROMETHEUS_LABELS_MAX 1024
+
+static void rrd_stats_api_v1_charts_allmetrics_prometheus(RRDHOST *host, BUFFER *wb, const char *prefix, uint32_t options, time_t after, time_t before, int allhosts, int help, int types, int names) {
+ rrdhost_rdlock(host);
+
+ char hostname[PROMETHEUS_ELEMENT_MAX + 1];
+ prometheus_label_copy(hostname, host->hostname, PROMETHEUS_ELEMENT_MAX);
+
+ char labels[PROMETHEUS_LABELS_MAX + 1] = "";
+ if(allhosts) {
+ if(host->tags && *(host->tags))
+ buffer_sprintf(wb, "netdata_host_tags{instance=\"%s\",%s} 1 %llu\n", hostname, host->tags, now_realtime_usec() / USEC_PER_MS);
+
+ snprintfz(labels, PROMETHEUS_LABELS_MAX, ",instance=\"%s\"", hostname);
+ }
+ else {
+ if(host->tags && *(host->tags))
+ buffer_sprintf(wb, "netdata_host_tags{%s} 1 %llu\n", host->tags, now_realtime_usec() / USEC_PER_MS);
+ }
+
+ // for each chart
+ RRDSET *st;
+ rrdset_foreach_read(st, host) {
+ char chart[PROMETHEUS_ELEMENT_MAX + 1];
+ char context[PROMETHEUS_ELEMENT_MAX + 1];
+ char family[PROMETHEUS_ELEMENT_MAX + 1];
+ char units[PROMETHEUS_ELEMENT_MAX + 1] = "";
+
+ prometheus_label_copy(chart, (names && st->name)?st->name:st->id, PROMETHEUS_ELEMENT_MAX);
+ prometheus_label_copy(family, st->family, PROMETHEUS_ELEMENT_MAX);
+ prometheus_name_copy(context, st->context, PROMETHEUS_ELEMENT_MAX);
+
+ if(likely(backends_can_send_rrdset(options, st))) {
+ rrdset_rdlock(st);
+
+ int as_collected = ((options & BACKEND_SOURCE_BITS) == BACKEND_SOURCE_DATA_AS_COLLECTED);
+ int homogeneus = 1;
+ if(as_collected) {
+ if(rrdset_flag_check(st, RRDSET_FLAG_HOMEGENEOUS_CHECK))
+ rrdset_update_heterogeneous_flag(st);
+
+ if(rrdset_flag_check(st, RRDSET_FLAG_HETEROGENEOUS))
+ homogeneus = 0;
+ }
+ else {
+ if((options & BACKEND_SOURCE_BITS) == BACKEND_SOURCE_DATA_AVERAGE)
+ prometheus_units_copy(units, st->units, PROMETHEUS_ELEMENT_MAX);
+ }
+
+ if(unlikely(help))
+ buffer_sprintf(wb, "\n# COMMENT %s chart \"%s\", context \"%s\", family \"%s\", units \"%s\"\n"
+ , (homogeneus)?"homogeneus":"heterogeneous"
+ , (names && st->name) ? st->name : st->id
+ , st->context
+ , st->family
+ , st->units
+ );
+
+ // for each dimension
+ RRDDIM *rd;
+ rrddim_foreach_read(rd, st) {
+ if(rd->collections_counter) {
+ char dimension[PROMETHEUS_ELEMENT_MAX + 1];
+ char *suffix = "";
+
+ if (as_collected) {
+ // we need as-collected / raw data
+
+ const char *t = "gauge", *h = "gives";
+ if(rd->algorithm == RRD_ALGORITHM_INCREMENTAL ||
+ rd->algorithm == RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL) {
+ t = "counter";
+ h = "delta gives";
+ suffix = "_total";
+ }
+
+ if(homogeneus) {
+ // all the dimensions of the chart, has the same algorithm, multiplier and divisor
+ // we add all dimensions as labels
+
+ prometheus_label_copy(dimension, (names && rd->name) ? rd->name : rd->id, PROMETHEUS_ELEMENT_MAX);
+
+ if(unlikely(help))
+ buffer_sprintf(wb
+ , "# COMMENT %s_%s%s: chart \"%s\", context \"%s\", family \"%s\", dimension \"%s\", value * " COLLECTED_NUMBER_FORMAT " / " COLLECTED_NUMBER_FORMAT " %s %s (%s)\n"
+ , prefix
+ , context
+ , suffix
+ , (names && st->name) ? st->name : st->id
+ , st->context
+ , st->family
+ , (names && rd->name) ? rd->name : rd->id
+ , rd->multiplier
+ , rd->divisor
+ , h
+ , st->units
+ , t
+ );
+
+ if(unlikely(types))
+ buffer_sprintf(wb, "# COMMENT TYPE %s_%s%s %s\n"
+ , prefix
+ , context
+ , suffix
+ , t
+ );
+
+ buffer_sprintf(wb
+ , "%s_%s%s{chart=\"%s\",family=\"%s\",dimension=\"%s\"%s} " COLLECTED_NUMBER_FORMAT " %llu\n"
+ , prefix
+ , context
+ , suffix
+ , chart
+ , family
+ , dimension
+ , labels
+ , rd->last_collected_value
+ , timeval_msec(&rd->last_collected_time)
+ );
+ }
+ else {
+ // the dimensions of the chart, do not have the same algorithm, multiplier or divisor
+ // we create a metric per dimension
+
+ prometheus_name_copy(dimension, (names && rd->name) ? rd->name : rd->id, PROMETHEUS_ELEMENT_MAX);
+
+ if(unlikely(help))
+ buffer_sprintf(wb
+ , "# COMMENT %s_%s_%s%s: chart \"%s\", context \"%s\", family \"%s\", dimension \"%s\", value * " COLLECTED_NUMBER_FORMAT " / " COLLECTED_NUMBER_FORMAT " %s %s (%s)\n"
+ , prefix
+ , context
+ , dimension
+ , suffix
+ , (names && st->name) ? st->name : st->id
+ , st->context
+ , st->family
+ , (names && rd->name) ? rd->name : rd->id
+ , rd->multiplier
+ , rd->divisor
+ , h
+ , st->units
+ , t
+ );
+
+ if(unlikely(types))
+ buffer_sprintf(wb, "# COMMENT TYPE %s_%s_%s%s %s\n"
+ , prefix
+ , context
+ , dimension
+ , suffix
+ , t
+ );
+
+ buffer_sprintf(wb
+ , "%s_%s_%s%s{chart=\"%s\",family=\"%s\"%s} " COLLECTED_NUMBER_FORMAT " %llu\n"
+ , prefix
+ , context
+ , dimension
+ , suffix
+ , chart
+ , family
+ , labels
+ , rd->last_collected_value
+ , timeval_msec(&rd->last_collected_time)
+ );
+ }
+ }
+ else {
+ // we need average or sum of the data
+
+ time_t first_t = after, last_t = before;
+ calculated_number value = backend_calculate_value_from_stored_data(st, rd, after, before, options, &first_t, &last_t);
+
+ if(!isnan(value) && !isinf(value)) {
+
+ if((options & BACKEND_SOURCE_BITS) == BACKEND_SOURCE_DATA_AVERAGE)
+ suffix = "_average";
+ else if((options & BACKEND_SOURCE_BITS) == BACKEND_SOURCE_DATA_SUM)
+ suffix = "_sum";
+
+ prometheus_label_copy(dimension, (names && rd->name) ? rd->name : rd->id, PROMETHEUS_ELEMENT_MAX);
+
+ if (unlikely(help))
+ buffer_sprintf(wb, "# COMMENT %s_%s%s%s: dimension \"%s\", value is %s, gauge, dt %llu to %llu inclusive\n"
+ , prefix
+ , context
+ , units
+ , suffix
+ , (names && rd->name) ? rd->name : rd->id
+ , st->units
+ , (unsigned long long)first_t
+ , (unsigned long long)last_t
+ );
+
+ if (unlikely(types))
+ buffer_sprintf(wb, "# COMMENT TYPE %s_%s%s%s gauge\n"
+ , prefix
+ , context
+ , units
+ , suffix
+ );
+
+ buffer_sprintf(wb, "%s_%s%s%s{chart=\"%s\",family=\"%s\",dimension=\"%s\"%s} " CALCULATED_NUMBER_FORMAT " %llu\n"
+ , prefix
+ , context
+ , units
+ , suffix
+ , chart
+ , family
+ , dimension
+ , labels
+ , value
+ , last_t * MSEC_PER_SEC
+ );
+ }
+ }
+ }
+ }
+
+ rrdset_unlock(st);
+ }
+ }
+
+ rrdhost_unlock(host);
+}
+
+static inline time_t prometheus_preparation(RRDHOST *host, BUFFER *wb, uint32_t options, const char *server, time_t now, int help) {
+ if(!server || !*server) server = "default";
+
+ time_t after = prometheus_server_last_access(server, now);
+
+ int first_seen = 0;
+ if(!after) {
+ after = now - backend_update_every;
+ first_seen = 1;
+ }
+
+ if(after > now) {
+ // oops! this should never happen
+ after = now - backend_update_every;
+ }
+
+ if(help) {
+ int show_range = 1;
+ char *mode;
+ if((options & BACKEND_SOURCE_BITS) == BACKEND_SOURCE_DATA_AS_COLLECTED) {
+ mode = "as collected";
+ show_range = 0;
+ }
+ else if((options & BACKEND_SOURCE_BITS) == BACKEND_SOURCE_DATA_AVERAGE)
+ mode = "average";
+ else if((options & BACKEND_SOURCE_BITS) == BACKEND_SOURCE_DATA_SUM)
+ mode = "sum";
+ else
+ mode = "unknown";
+
+ buffer_sprintf(wb, "# COMMENT netdata \"%s\" to %sprometheus \"%s\", source \"%s\", last seen %lu %s"
+ , host->hostname
+ , (first_seen)?"FIRST SEEN ":""
+ , server
+ , mode
+ , (unsigned long)((first_seen)?0:(now - after))
+ , (first_seen)?"never":"seconds ago"
+ );
+
+ if(show_range)
+ buffer_sprintf(wb, ", time range %lu to %lu", (unsigned long)after, (unsigned long)now);
+
+ buffer_strcat(wb, "\n\n");
+ }
+
+ return after;
+}
+
+void rrd_stats_api_v1_charts_allmetrics_prometheus_single_host(RRDHOST *host, BUFFER *wb, const char *server, const char *prefix, uint32_t options, int help, int types, int names) {
+ time_t before = now_realtime_sec();
+
+ // we start at the point we had stopped before
+ time_t after = prometheus_preparation(host, wb, options, server, before, help);
+
+ rrd_stats_api_v1_charts_allmetrics_prometheus(host, wb, prefix, options, after, before, 0, help, types, names);
+}
+
+void rrd_stats_api_v1_charts_allmetrics_prometheus_all_hosts(RRDHOST *host, BUFFER *wb, const char *server, const char *prefix, uint32_t options, int help, int types, int names) {
+ time_t before = now_realtime_sec();
+
+ // we start at the point we had stopped before
+ time_t after = prometheus_preparation(host, wb, options, server, before, help);
+
+ rrd_rdlock();
+ rrdhost_foreach_read(host) {
+ rrd_stats_api_v1_charts_allmetrics_prometheus(host, wb, prefix, options, after, before, 1, help, types, names);
+ }
+ rrd_unlock();
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 07:00:12 +0000