diff options
Diffstat (limited to '')
| -rw-r--r-- | exporting/prometheus/prometheus.c | 916 |
1 files changed, 916 insertions, 0 deletions
diff --git a/exporting/prometheus/prometheus.c b/exporting/prometheus/prometheus.c new file mode 100644 index 0000000..371f5a5 --- /dev/null +++ b/exporting/prometheus/prometheus.c @@ -0,0 +1,916 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#define EXPORTINGS_INTERNALS +#include "prometheus.h" + +// ---------------------------------------------------------------------------- +// PROMETHEUS +// /api/v1/allmetrics?format=prometheus and /api/v1/allmetrics?format=prometheus_all_hosts + +/** + * Check if a chart can be sent to Prometheus + * + * @param instance an instance data structure. + * @param st a chart. + * @return Returns 1 if the chart can be sent, 0 otherwise. + */ +inline int can_send_rrdset(struct instance *instance, RRDSET *st) +{ + RRDHOST *host = st->rrdhost; + + if (unlikely(rrdset_flag_check(st, RRDSET_FLAG_BACKEND_IGNORE))) + return 0; + + if (unlikely(!rrdset_flag_check(st, RRDSET_FLAG_BACKEND_SEND))) { + // we have not checked this chart + if (simple_pattern_matches(instance->config.charts_pattern, st->id) || + simple_pattern_matches(instance->config.charts_pattern, st->name)) + rrdset_flag_set(st, RRDSET_FLAG_BACKEND_SEND); + else { + rrdset_flag_set(st, RRDSET_FLAG_BACKEND_IGNORE); + debug( + D_BACKEND, + "EXPORTING: not sending chart '%s' of host '%s', because it is disabled for exporting.", + st->id, + host->hostname); + return 0; + } + } + + if (unlikely(!rrdset_is_available_for_backends(st))) { + debug( + D_BACKEND, + "EXPORTING: not sending chart '%s' of host '%s', because it is not available for exporting.", + st->id, + host->hostname); + return 0; + } + + if (unlikely( + st->rrd_memory_mode == RRD_MEMORY_MODE_NONE && + !(EXPORTING_OPTIONS_DATA_SOURCE(instance->config.options) == EXPORTING_SOURCE_DATA_AS_COLLECTED))) { + debug( + D_BACKEND, + "EXPORTING: not sending chart '%s' of host '%s' because its memory mode is '%s' and the exporting connector requires database access.", + st->id, + host->hostname, + rrd_memory_mode_name(host->rrd_memory_mode)); + return 0; + } + + return 1; +} + +static struct prometheus_server { + const char *server; + uint32_t hash; + RRDHOST *host; + time_t last_access; + struct prometheus_server *next; +} *prometheus_server_root = NULL; + +static netdata_mutex_t prometheus_server_root_mutex = NETDATA_MUTEX_INITIALIZER; + +/** + * Clean server root local structure + */ +void prometheus_clean_server_root() +{ + if (prometheus_server_root) { + netdata_mutex_lock(&prometheus_server_root_mutex); + + struct prometheus_server *ps; + for (ps = prometheus_server_root; ps; ) { + struct prometheus_server *current = ps; + ps = ps->next; + if(current->server) + freez((void *)current->server); + + freez(current); + } + prometheus_server_root = NULL; + netdata_mutex_unlock(&prometheus_server_root_mutex); + } +} + +/** + * Get the last time when a Prometheus server scraped the Netdata Prometheus exporter. + * + * @param server the name of the Prometheus server. + * @param host a data collecting host. + * @param now actual time. + * @return Returns the last time when the server accessed Netdata, or 0 if it is the first occurrence. + */ +static inline time_t prometheus_server_last_access(const char *server, RRDHOST *host, time_t now) +{ +#ifdef UNIT_TESTING + return 0; +#endif + uint32_t hash = simple_hash(server); + + netdata_mutex_lock(&prometheus_server_root_mutex); + + struct prometheus_server *ps; + for (ps = prometheus_server_root; ps; ps = ps->next) { + if (host == ps->host && hash == ps->hash && !strcmp(server, ps->server)) { + time_t last = ps->last_access; + ps->last_access = now; + netdata_mutex_unlock(&prometheus_server_root_mutex); + return last; + } + } + + ps = callocz(1, sizeof(struct prometheus_server)); + ps->server = strdupz(server); + ps->hash = hash; + ps->host = host; + ps->last_access = now; + ps->next = prometheus_server_root; + prometheus_server_root = ps; + + netdata_mutex_unlock(&prometheus_server_root_mutex); + return 0; +} + +/** + * Copy and sanitize name. + * + * @param d a destination string. + * @param s a source sting. + * @param usable the number of characters to copy. + * @return Returns the length of the copied string. + */ +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; +} + +/** + * Copy and sanitize label. + * + * @param d a destination string. + * @param s a source sting. + * @param usable the number of characters to copy. + * @return Returns the length of the copied string. + */ +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; +} + +/** + * Copy and sanitize units. + * + * @param d a destination string. + * @param s a source sting. + * @param usable the number of characters to copy. + * @param showoldunits set this flag to 1 to show old (before v1.12) units. + * @return Returns the destination string. + */ +inline char *prometheus_units_copy(char *d, const char *s, size_t usable, int showoldunits) +{ + const char *sorig = s; + char *ret = d; + size_t n; + + // Fix for issue 5227 + if (unlikely(showoldunits)) { + static struct { + const char *newunit; + uint32_t hash; + const char *oldunit; + } units[] = { { "KiB/s", 0, "kilobytes/s" }, + { "MiB/s", 0, "MB/s" }, + { "GiB/s", 0, "GB/s" }, + { "KiB", 0, "KB" }, + { "MiB", 0, "MB" }, + { "GiB", 0, "GB" }, + { "inodes", 0, "Inodes" }, + { "percentage", 0, "percent" }, + { "faults/s", 0, "page faults/s" }, + { "KiB/operation", 0, "kilobytes per operation" }, + { "milliseconds/operation", 0, "ms per operation" }, + { NULL, 0, NULL } }; + static int initialized = 0; + int i; + + if (unlikely(!initialized)) { + for (i = 0; units[i].newunit; i++) + units[i].hash = simple_hash(units[i].newunit); + initialized = 1; + } + + uint32_t hash = simple_hash(s); + for (i = 0; units[i].newunit; i++) { + if (unlikely(hash == units[i].hash && !strcmp(s, units[i].newunit))) { + // info("matched extension for filename '%s': '%s'", filename, last_dot); + s = units[i].oldunit; + sorig = s; + break; + } + } + } + *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; +} + +/** + * Format host labels for the Prometheus exporter + * + * @param instance an instance data structure. + * @param host a data collecting host. + */ +void format_host_labels_prometheus(struct instance *instance, RRDHOST *host) +{ + if (unlikely(!sending_labels_configured(instance))) + return; + + if (!instance->labels) + instance->labels = buffer_create(1024); + + int count = 0; + rrdhost_check_rdlock(host); + netdata_rwlock_rdlock(&host->labels.labels_rwlock); + for (struct label *label = host->labels.head; label; label = label->next) { + if (!should_send_label(instance, label)) + continue; + + char key[PROMETHEUS_ELEMENT_MAX + 1]; + char value[PROMETHEUS_ELEMENT_MAX + 1]; + + prometheus_name_copy(key, label->key, PROMETHEUS_ELEMENT_MAX); + prometheus_label_copy(value, label->value, PROMETHEUS_ELEMENT_MAX); + + if (*key && *value) { + if (count > 0) + buffer_strcat(instance->labels, ","); + buffer_sprintf(instance->labels, "%s=\"%s\"", key, value); + count++; + } + } + netdata_rwlock_unlock(&host->labels.labels_rwlock); +} + +struct host_variables_callback_options { + RRDHOST *host; + BUFFER *wb; + EXPORTING_OPTIONS exporting_options; + PROMETHEUS_OUTPUT_OPTIONS output_options; + const char *prefix; + const char *labels; + time_t now; + int host_header_printed; + char name[PROMETHEUS_VARIABLE_MAX + 1]; +}; + +/** + * Print host variables. + * + * @param rv a variable. + * @param data callback options. + * @return Returns 1 if the chart can be sent, 0 otherwise. + */ +static int print_host_variables(RRDVAR *rv, void *data) +{ + struct host_variables_callback_options *opts = data; + + if (rv->options & (RRDVAR_OPTION_CUSTOM_HOST_VAR | RRDVAR_OPTION_CUSTOM_CHART_VAR)) { + if (!opts->host_header_printed) { + opts->host_header_printed = 1; + + if (opts->output_options & PROMETHEUS_OUTPUT_HELP) { + buffer_sprintf(opts->wb, "\n# COMMENT global host and chart variables\n"); + } + } + + calculated_number value = rrdvar2number(rv); + if (isnan(value) || isinf(value)) { + if (opts->output_options & PROMETHEUS_OUTPUT_HELP) + buffer_sprintf( + opts->wb, "# COMMENT variable \"%s\" is %s. Skipped.\n", rv->name, (isnan(value)) ? "NAN" : "INF"); + + return 0; + } + + char *label_pre = ""; + char *label_post = ""; + if (opts->labels && *opts->labels) { + label_pre = "{"; + label_post = "}"; + } + + prometheus_name_copy(opts->name, rv->name, sizeof(opts->name)); + + if (opts->output_options & PROMETHEUS_OUTPUT_TIMESTAMPS) + buffer_sprintf( + opts->wb, + "%s_%s%s%s%s " CALCULATED_NUMBER_FORMAT " %llu\n", + opts->prefix, + opts->name, + label_pre, + opts->labels, + label_post, + value, + opts->now * 1000ULL); + else + buffer_sprintf( + opts->wb, + "%s_%s%s%s%s " CALCULATED_NUMBER_FORMAT "\n", + opts->prefix, + opts->name, + label_pre, + opts->labels, + label_post, + value); + + return 1; + } + + return 0; +} + +struct gen_parameters { + const char *prefix; + char *context; + char *suffix; + + char *chart; + char *dimension; + char *family; + char *labels; + + PROMETHEUS_OUTPUT_OPTIONS output_options; + RRDSET *st; + RRDDIM *rd; + + const char *relation; + const char *type; +}; + +/** + * Write an as-collected help comment to a buffer. + * + * @param wb the buffer to write the comment to. + * @param p parameters for generating the comment string. + * @param homogeneous a flag for homogeneous charts. + * @param prometheus_collector a flag for metrics from prometheus collector. + */ +static void generate_as_collected_prom_help(BUFFER *wb, struct gen_parameters *p, int homogeneous, int prometheus_collector) +{ + buffer_sprintf(wb, "# COMMENT %s_%s", p->prefix, p->context); + + if (!homogeneous) + buffer_sprintf(wb, "_%s", p->dimension); + + buffer_sprintf( + wb, + "%s: chart \"%s\", context \"%s\", family \"%s\", dimension \"%s\", value * ", + p->suffix, + (p->output_options & PROMETHEUS_OUTPUT_NAMES && p->st->name) ? p->st->name : p->st->id, + p->st->context, + p->st->family, + (p->output_options & PROMETHEUS_OUTPUT_NAMES && p->rd->name) ? p->rd->name : p->rd->id); + + if (prometheus_collector) + buffer_sprintf(wb, "1 / 1"); + else + buffer_sprintf(wb, COLLECTED_NUMBER_FORMAT " / " COLLECTED_NUMBER_FORMAT, p->rd->multiplier, p->rd->divisor); + + buffer_sprintf(wb, " %s %s (%s)\n", p->relation, p->st->units, p->type); +} + +/** + * Write an as-collected metric to a buffer. + * + * @param wb the buffer to write the metric to. + * @param p parameters for generating the metric string. + * @param homogeneous a flag for homogeneous charts. + * @param prometheus_collector a flag for metrics from prometheus collector. + */ +static void generate_as_collected_prom_metric(BUFFER *wb, struct gen_parameters *p, int homogeneous, int prometheus_collector) +{ + buffer_sprintf(wb, "%s_%s", p->prefix, p->context); + + if (!homogeneous) + buffer_sprintf(wb, "_%s", p->dimension); + + buffer_sprintf(wb, "%s{chart=\"%s\",family=\"%s\"", p->suffix, p->chart, p->family); + + if (homogeneous) + buffer_sprintf(wb, ",dimension=\"%s\"", p->dimension); + + buffer_sprintf(wb, "%s} ", p->labels); + + if (prometheus_collector) + buffer_sprintf( + wb, + CALCULATED_NUMBER_FORMAT, + (calculated_number)p->rd->last_collected_value * (calculated_number)p->rd->multiplier / + (calculated_number)p->rd->divisor); + else + buffer_sprintf(wb, COLLECTED_NUMBER_FORMAT, p->rd->last_collected_value); + + if (p->output_options & PROMETHEUS_OUTPUT_TIMESTAMPS) + buffer_sprintf(wb, " %llu\n", timeval_msec(&p->rd->last_collected_time)); + else + buffer_sprintf(wb, "\n"); +} + +/** + * Write metrics in Prometheus format to a buffer. + * + * @param instance an instance data structure. + * @param host a data collecting host. + * @param wb the buffer to fill with metrics. + * @param prefix a prefix for every metric. + * @param exporting_options options to configure what data is exported. + * @param allhosts set to 1 if host instance should be in the output for tags. + * @param output_options options to configure the format of the output. + */ +static void rrd_stats_api_v1_charts_allmetrics_prometheus( + struct instance *instance, + RRDHOST *host, + BUFFER *wb, + const char *prefix, + EXPORTING_OPTIONS exporting_options, + int allhosts, + PROMETHEUS_OUTPUT_OPTIONS output_options) +{ + rrdhost_rdlock(host); + + char hostname[PROMETHEUS_ELEMENT_MAX + 1]; + prometheus_label_copy(hostname, host->hostname, PROMETHEUS_ELEMENT_MAX); + + format_host_labels_prometheus(instance, host); + + if (output_options & PROMETHEUS_OUTPUT_TIMESTAMPS) + buffer_sprintf( + wb, + "netdata_info{instance=\"%s\",application=\"%s\",version=\"%s\"} 1 %llu\n", + hostname, + host->program_name, + host->program_version, + now_realtime_usec() / USEC_PER_MS); + else + buffer_sprintf( + wb, + "netdata_info{instance=\"%s\",application=\"%s\",version=\"%s\"} 1\n", + hostname, + host->program_name, + host->program_version); + + char labels[PROMETHEUS_LABELS_MAX + 1] = ""; + if (allhosts) { + if (instance->labels && buffer_tostring(instance->labels)) { + if (output_options & PROMETHEUS_OUTPUT_TIMESTAMPS) { + buffer_sprintf( + wb, + "netdata_host_tags_info{instance=\"%s\",%s} 1 %llu\n", + hostname, + buffer_tostring(instance->labels), + now_realtime_usec() / USEC_PER_MS); + + // deprecated, exists only for compatibility with older queries + buffer_sprintf( + wb, + "netdata_host_tags{instance=\"%s\",%s} 1 %llu\n", + hostname, + buffer_tostring(instance->labels), + now_realtime_usec() / USEC_PER_MS); + } else { + buffer_sprintf( + wb, "netdata_host_tags_info{instance=\"%s\",%s} 1\n", hostname, buffer_tostring(instance->labels)); + + // deprecated, exists only for compatibility with older queries + buffer_sprintf( + wb, "netdata_host_tags{instance=\"%s\",%s} 1\n", hostname, buffer_tostring(instance->labels)); + } + } + + snprintfz(labels, PROMETHEUS_LABELS_MAX, ",instance=\"%s\"", hostname); + } else { + if (instance->labels && buffer_tostring(instance->labels)) { + if (output_options & PROMETHEUS_OUTPUT_TIMESTAMPS) { + buffer_sprintf( + wb, + "netdata_host_tags_info{%s} 1 %llu\n", + buffer_tostring(instance->labels), + now_realtime_usec() / USEC_PER_MS); + + // deprecated, exists only for compatibility with older queries + buffer_sprintf( + wb, + "netdata_host_tags{%s} 1 %llu\n", + buffer_tostring(instance->labels), + now_realtime_usec() / USEC_PER_MS); + } else { + buffer_sprintf(wb, "netdata_host_tags_info{%s} 1\n", buffer_tostring(instance->labels)); + + // deprecated, exists only for compatibility with older queries + buffer_sprintf(wb, "netdata_host_tags{%s} 1\n", buffer_tostring(instance->labels)); + } + } + } + + if (instance->labels) + buffer_flush(instance->labels); + + // send custom variables set for the host + if (output_options & PROMETHEUS_OUTPUT_VARIABLES) { + struct host_variables_callback_options opts = { .host = host, + .wb = wb, + .labels = (labels[0] == ',') ? &labels[1] : labels, + .exporting_options = exporting_options, + .output_options = output_options, + .prefix = prefix, + .now = now_realtime_sec(), + .host_header_printed = 0 }; + foreach_host_variable_callback(host, print_host_variables, &opts); + } + + // for each chart + RRDSET *st; + rrdset_foreach_read(st, host) + { + + if (likely(can_send_rrdset(instance, st))) { + rrdset_rdlock(st); + + 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, (output_options & PROMETHEUS_OUTPUT_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); + + int as_collected = (EXPORTING_OPTIONS_DATA_SOURCE(exporting_options) == EXPORTING_SOURCE_DATA_AS_COLLECTED); + int homogeneous = 1; + int prometheus_collector = 0; + if (as_collected) { + if (rrdset_flag_check(st, RRDSET_FLAG_HOMOGENEOUS_CHECK)) + rrdset_update_heterogeneous_flag(st); + + if (rrdset_flag_check(st, RRDSET_FLAG_HETEROGENEOUS)) + homogeneous = 0; + + if (st->module_name && !strcmp(st->module_name, "prometheus")) + prometheus_collector = 1; + } else { + if (EXPORTING_OPTIONS_DATA_SOURCE(exporting_options) == EXPORTING_SOURCE_DATA_AVERAGE && + !(output_options & PROMETHEUS_OUTPUT_HIDEUNITS)) + prometheus_units_copy( + units, st->units, PROMETHEUS_ELEMENT_MAX, output_options & PROMETHEUS_OUTPUT_OLDUNITS); + } + + if (unlikely(output_options & PROMETHEUS_OUTPUT_HELP)) + buffer_sprintf( + wb, + "\n# COMMENT %s chart \"%s\", context \"%s\", family \"%s\", units \"%s\"\n", + (homogeneous) ? "homogeneous" : "heterogeneous", + (output_options & PROMETHEUS_OUTPUT_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 && !rrddim_flag_check(rd, RRDDIM_FLAG_OBSOLETE)) { + char dimension[PROMETHEUS_ELEMENT_MAX + 1]; + char *suffix = ""; + + if (as_collected) { + // we need as-collected / raw data + + struct gen_parameters p; + p.prefix = prefix; + p.context = context; + p.suffix = suffix; + p.chart = chart; + p.dimension = dimension; + p.family = family; + p.labels = labels; + p.output_options = output_options; + p.st = st; + p.rd = rd; + + if (unlikely(rd->last_collected_time.tv_sec < instance->after)) + continue; + + p.type = "gauge"; + p.relation = "gives"; + if (rd->algorithm == RRD_ALGORITHM_INCREMENTAL || + rd->algorithm == RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL) { + p.type = "counter"; + p.relation = "delta gives"; + p.suffix = "_total"; + } + + if (homogeneous) { + // all the dimensions of the chart, has the same algorithm, multiplier and divisor + // we add all dimensions as labels + + prometheus_label_copy( + dimension, + (output_options & PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id, + PROMETHEUS_ELEMENT_MAX); + + if (unlikely(output_options & PROMETHEUS_OUTPUT_HELP)) + generate_as_collected_prom_help(wb, &p, homogeneous, prometheus_collector); + + if (unlikely(output_options & PROMETHEUS_OUTPUT_TYPES)) + buffer_sprintf(wb, "# TYPE %s_%s%s %s\n", prefix, context, suffix, p.type); + + generate_as_collected_prom_metric(wb, &p, homogeneous, prometheus_collector); + } 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, + (output_options & PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id, + PROMETHEUS_ELEMENT_MAX); + + if (unlikely(output_options & PROMETHEUS_OUTPUT_HELP)) + generate_as_collected_prom_help(wb, &p, homogeneous, prometheus_collector); + + if (unlikely(output_options & PROMETHEUS_OUTPUT_TYPES)) + buffer_sprintf( + wb, "# TYPE %s_%s_%s%s %s\n", prefix, context, dimension, suffix, p.type); + + generate_as_collected_prom_metric(wb, &p, homogeneous, prometheus_collector); + } + } else { + // we need average or sum of the data + + time_t first_time = instance->after; + time_t last_time = instance->before; + calculated_number value = exporting_calculate_value_from_stored_data(instance, rd, &last_time); + + if (!isnan(value) && !isinf(value)) { + if (EXPORTING_OPTIONS_DATA_SOURCE(exporting_options) == EXPORTING_SOURCE_DATA_AVERAGE) + suffix = "_average"; + else if (EXPORTING_OPTIONS_DATA_SOURCE(exporting_options) == EXPORTING_SOURCE_DATA_SUM) + suffix = "_sum"; + + prometheus_label_copy( + dimension, + (output_options & PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id, + PROMETHEUS_ELEMENT_MAX); + + if (unlikely(output_options & PROMETHEUS_OUTPUT_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, + (output_options & PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id, + st->units, + (unsigned long long)first_time, + (unsigned long long)last_time); + + if (unlikely(output_options & PROMETHEUS_OUTPUT_TYPES)) + buffer_sprintf(wb, "# TYPE %s_%s%s%s gauge\n", prefix, context, units, suffix); + + if (output_options & PROMETHEUS_OUTPUT_TIMESTAMPS) + 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_time * MSEC_PER_SEC); + else + buffer_sprintf( + wb, + "%s_%s%s%s{chart=\"%s\",family=\"%s\",dimension=\"%s\"%s} " CALCULATED_NUMBER_FORMAT + "\n", + prefix, + context, + units, + suffix, + chart, + family, + dimension, + labels, + value); + } + } + } + } + + rrdset_unlock(st); + } + } + + rrdhost_unlock(host); +} + +/** + * Get the last time time when a server accessed Netdata. Write information about an API request to a buffer. + * + * @param instance an instance data structure. + * @param host a data collecting host. + * @param wb the buffer to write to. + * @param exporting_options options to configure what data is exported. + * @param server the name of a Prometheus server.. + * @param now actual time. + * @param output_options options to configure the format of the output. + * @return Returns the last time when the server accessed Netdata. + */ +static inline time_t prometheus_preparation( + struct instance *instance, + RRDHOST *host, + BUFFER *wb, + EXPORTING_OPTIONS exporting_options, + const char *server, + time_t now, + PROMETHEUS_OUTPUT_OPTIONS output_options) +{ + if (!server || !*server) + server = "default"; + + time_t after = prometheus_server_last_access(server, host, now); + + int first_seen = 0; + if (!after) { + after = now - instance->config.update_every; + first_seen = 1; + } + + if (after > now) { + // oops! this should never happen + after = now - instance->config.update_every; + } + + if (output_options & PROMETHEUS_OUTPUT_HELP) { + char *mode; + if (EXPORTING_OPTIONS_DATA_SOURCE(exporting_options) == EXPORTING_SOURCE_DATA_AS_COLLECTED) + mode = "as collected"; + else if (EXPORTING_OPTIONS_DATA_SOURCE(exporting_options) == EXPORTING_SOURCE_DATA_AVERAGE) + mode = "average"; + else if (EXPORTING_OPTIONS_DATA_SOURCE(exporting_options) == EXPORTING_SOURCE_DATA_SUM) + mode = "sum"; + else + mode = "unknown"; + + buffer_sprintf( + wb, + "# COMMENT netdata \"%s\" to %sprometheus \"%s\", source \"%s\", last seen %lu %s, time range %lu to %lu\n\n", + host->hostname, + (first_seen) ? "FIRST SEEN " : "", + server, + mode, + (unsigned long)((first_seen) ? 0 : (now - after)), + (first_seen) ? "never" : "seconds ago", + (unsigned long)after, + (unsigned long)now); + } + + return after; +} + +/** + * Write metrics and auxiliary information for one host to a buffer. + * + * @param host a data collecting host. + * @param wb the buffer to write to. + * @param server the name of a Prometheus server. + * @param prefix a prefix for every metric. + * @param exporting_options options to configure what data is exported. + * @param output_options options to configure the format of the output. + */ +void rrd_stats_api_v1_charts_allmetrics_prometheus_single_host( + RRDHOST *host, + BUFFER *wb, + const char *server, + const char *prefix, + EXPORTING_OPTIONS exporting_options, + PROMETHEUS_OUTPUT_OPTIONS output_options) +{ + if (unlikely(!prometheus_exporter_instance)) + return; + + prometheus_exporter_instance->before = now_realtime_sec(); + + // we start at the point we had stopped before + prometheus_exporter_instance->after = prometheus_preparation( + prometheus_exporter_instance, + host, + wb, + exporting_options, + server, + prometheus_exporter_instance->before, + output_options); + + rrd_stats_api_v1_charts_allmetrics_prometheus( + prometheus_exporter_instance, host, wb, prefix, exporting_options, 0, output_options); +} + +/** + * Write metrics and auxiliary information for all hosts to a buffer. + * + * @param host a data collecting host. + * @param wb the buffer to write to. + * @param server the name of a Prometheus server. + * @param prefix a prefix for every metric. + * @param exporting_options options to configure what data is exported. + * @param output_options options to configure the format of the output. + */ +void rrd_stats_api_v1_charts_allmetrics_prometheus_all_hosts( + RRDHOST *host, + BUFFER *wb, + const char *server, + const char *prefix, + EXPORTING_OPTIONS exporting_options, + PROMETHEUS_OUTPUT_OPTIONS output_options) +{ + if (unlikely(!prometheus_exporter_instance)) + return; + + prometheus_exporter_instance->before = now_realtime_sec(); + + // we start at the point we had stopped before + prometheus_exporter_instance->after = prometheus_preparation( + prometheus_exporter_instance, + host, + wb, + exporting_options, + server, + prometheus_exporter_instance->before, + output_options); + + rrd_rdlock(); + rrdhost_foreach_read(host) + { + rrd_stats_api_v1_charts_allmetrics_prometheus( + prometheus_exporter_instance, host, wb, prefix, exporting_options, 1, output_options); + } + rrd_unlock(); +} |