Updated version 1.7.0+dfsg from 'upstream/1.7.0+dfsg'

with Debian dir e101ee6549c6786aab4b3f5c4f9bbb7638f17e34

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();
+}