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-rw-r--r--exporting/process_data.c426
1 files changed, 426 insertions, 0 deletions
diff --git a/exporting/process_data.c b/exporting/process_data.c
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--- /dev/null
+++ b/exporting/process_data.c
@@ -0,0 +1,426 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "exporting_engine.h"
+
+/**
+ * Normalize chart and dimension names
+ *
+ * Substitute '_' for any special character except '.'.
+ *
+ * @param dst where to copy name to.
+ * @param src where to copy name from.
+ * @param max_len the maximum size of copied name.
+ * @return Returns the size of the copied name.
+ */
+size_t exporting_name_copy(char *dst, const char *src, size_t max_len)
+{
+ size_t n;
+
+ for (n = 0; *src && n < max_len; dst++, src++, n++) {
+ char c = *src;
+
+ if (c != '.' && !isalnum(c))
+ *dst = '_';
+ else
+ *dst = c;
+ }
+ *dst = '\0';
+
+ return n;
+}
+
+/**
+ * Mark scheduled instances
+ *
+ * Any instance can have its own update interval. On every exporting engine update only those instances are picked,
+ * which are scheduled for the update.
+ *
+ * @param engine an engine data structure.
+ * @return Returns 1 if there are instances to process
+ */
+int mark_scheduled_instances(struct engine *engine)
+{
+ int instances_were_scheduled = 0;
+
+ for (struct instance *instance = engine->instance_root; instance; instance = instance->next) {
+ if (!instance->disabled && (engine->now % instance->config.update_every >=
+ instance->config.update_every - localhost->rrd_update_every)) {
+ instance->scheduled = 1;
+ instances_were_scheduled = 1;
+ instance->before = engine->now;
+ }
+ }
+
+ return instances_were_scheduled;
+}
+
+/**
+ * Calculate the SUM or AVERAGE of a dimension, for any timeframe
+ *
+ * May return NAN if the database does not have any value in the give timeframe.
+ *
+ * @param instance an instance data structure.
+ * @param rd a dimension(metric) in the Netdata database.
+ * @param last_timestamp the timestamp that should be reported to the exporting connector instance.
+ * @return Returns the value, calculated over the given period.
+ */
+calculated_number exporting_calculate_value_from_stored_data(
+ struct instance *instance,
+ RRDDIM *rd,
+ time_t *last_timestamp)
+{
+ RRDSET *st = rd->rrdset;
+ RRDHOST *host = st->rrdhost;
+ time_t after = instance->after;
+ time_t before = instance->before;
+
+ // find the edges of the rrd database for this chart
+ time_t first_t = rd->state->query_ops.oldest_time(rd);
+ time_t last_t = rd->state->query_ops.latest_time(rd);
+ time_t update_every = st->update_every;
+ struct rrddim_query_handle handle;
+ storage_number n;
+
+ // step back a little, to make sure we have complete data collection
+ // for all metrics
+ after -= update_every * 2;
+ before -= update_every * 2;
+
+ // align the time-frame
+ after = after - (after % update_every);
+ before = before - (before % update_every);
+
+ // for before, loose another iteration
+ // the latest point will be reported the next time
+ before -= update_every;
+
+ if (unlikely(after > before))
+ // this can happen when update_every > before - after
+ after = before;
+
+ if (unlikely(after < first_t))
+ after = first_t;
+
+ if (unlikely(before > last_t))
+ before = last_t;
+
+ if (unlikely(before < first_t || after > last_t)) {
+ // the chart has not been updated in the wanted timeframe
+ debug(
+ D_BACKEND,
+ "EXPORTING: %s.%s.%s: aligned timeframe %lu to %lu is outside the chart's database range %lu to %lu",
+ host->hostname,
+ st->id,
+ rd->id,
+ (unsigned long)after,
+ (unsigned long)before,
+ (unsigned long)first_t,
+ (unsigned long)last_t);
+ return NAN;
+ }
+
+ *last_timestamp = before;
+
+ size_t counter = 0;
+ calculated_number sum = 0;
+
+ for (rd->state->query_ops.init(rd, &handle, after, before); !rd->state->query_ops.is_finished(&handle);) {
+ time_t curr_t;
+ n = rd->state->query_ops.next_metric(&handle, &curr_t);
+
+ if (unlikely(!does_storage_number_exist(n))) {
+ // not collected
+ continue;
+ }
+
+ calculated_number value = unpack_storage_number(n);
+ sum += value;
+
+ counter++;
+ }
+ rd->state->query_ops.finalize(&handle);
+ if (unlikely(!counter)) {
+ debug(
+ D_BACKEND,
+ "EXPORTING: %s.%s.%s: no values stored in database for range %lu to %lu",
+ host->hostname,
+ st->id,
+ rd->id,
+ (unsigned long)after,
+ (unsigned long)before);
+ return NAN;
+ }
+
+ if (unlikely(EXPORTING_OPTIONS_DATA_SOURCE(instance->config.options) == EXPORTING_SOURCE_DATA_SUM))
+ return sum;
+
+ return sum / (calculated_number)counter;
+}
+
+/**
+ * Start batch formatting for every connector instance's buffer
+ *
+ * @param engine an engine data structure.
+ */
+void start_batch_formatting(struct engine *engine)
+{
+ for (struct instance *instance = engine->instance_root; instance; instance = instance->next) {
+ if (instance->scheduled) {
+ uv_mutex_lock(&instance->mutex);
+ if (instance->start_batch_formatting && instance->start_batch_formatting(instance) != 0) {
+ error("EXPORTING: cannot start batch formatting for %s", instance->config.name);
+ disable_instance(instance);
+ }
+ }
+ }
+}
+
+/**
+ * Start host formatting for every connector instance's buffer
+ *
+ * @param engine an engine data structure.
+ * @param host a data collecting host.
+ */
+void start_host_formatting(struct engine *engine, RRDHOST *host)
+{
+ for (struct instance *instance = engine->instance_root; instance; instance = instance->next) {
+ if (instance->scheduled) {
+ if (rrdhost_is_exportable(instance, host)) {
+ if (instance->start_host_formatting && instance->start_host_formatting(instance, host) != 0) {
+ error("EXPORTING: cannot start host formatting for %s", instance->config.name);
+ disable_instance(instance);
+ }
+ } else {
+ instance->skip_host = 1;
+ }
+ }
+ }
+}
+
+/**
+ * Start chart formatting for every connector instance's buffer
+ *
+ * @param engine an engine data structure.
+ * @param st a chart.
+ */
+void start_chart_formatting(struct engine *engine, RRDSET *st)
+{
+ for (struct instance *instance = engine->instance_root; instance; instance = instance->next) {
+ if (instance->scheduled && !instance->skip_host) {
+ if (rrdset_is_exportable(instance, st)) {
+ if (instance->start_chart_formatting && instance->start_chart_formatting(instance, st) != 0) {
+ error("EXPORTING: cannot start chart formatting for %s", instance->config.name);
+ disable_instance(instance);
+ }
+ } else {
+ instance->skip_chart = 1;
+ }
+ }
+ }
+}
+
+/**
+ * Format metric for every connector instance's buffer
+ *
+ * @param engine an engine data structure.
+ * @param rd a dimension(metric) in the Netdata database.
+ */
+void metric_formatting(struct engine *engine, RRDDIM *rd)
+{
+ for (struct instance *instance = engine->instance_root; instance; instance = instance->next) {
+ if (instance->scheduled && !instance->skip_host && !instance->skip_chart) {
+ if (instance->metric_formatting && instance->metric_formatting(instance, rd) != 0) {
+ error("EXPORTING: cannot format metric for %s", instance->config.name);
+ disable_instance(instance);
+ continue;
+ }
+ instance->stats.buffered_metrics++;
+ }
+ }
+}
+
+/**
+ * End chart formatting for every connector instance's buffer
+ *
+ * @param engine an engine data structure.
+ * @param a chart.
+ */
+void end_chart_formatting(struct engine *engine, RRDSET *st)
+{
+ for (struct instance *instance = engine->instance_root; instance; instance = instance->next) {
+ if (instance->scheduled && !instance->skip_host && !instance->skip_chart) {
+ if (instance->end_chart_formatting && instance->end_chart_formatting(instance, st) != 0) {
+ error("EXPORTING: cannot end chart formatting for %s", instance->config.name);
+ disable_instance(instance);
+ continue;
+ }
+ }
+ instance->skip_chart = 0;
+ }
+}
+
+/**
+ * End host formatting for every connector instance's buffer
+ *
+ * @param engine an engine data structure.
+ * @param host a data collecting host.
+ */
+void end_host_formatting(struct engine *engine, RRDHOST *host)
+{
+ for (struct instance *instance = engine->instance_root; instance; instance = instance->next) {
+ if (instance->scheduled && !instance->skip_host) {
+ if (instance->end_host_formatting && instance->end_host_formatting(instance, host) != 0) {
+ error("EXPORTING: cannot end host formatting for %s", instance->config.name);
+ disable_instance(instance);
+ continue;
+ }
+ }
+ instance->skip_host = 0;
+ }
+}
+
+/**
+ * End batch formatting for every connector instance's buffer
+ *
+ * @param engine an engine data structure.
+ */
+void end_batch_formatting(struct engine *engine)
+{
+ for (struct instance *instance = engine->instance_root; instance; instance = instance->next) {
+ if (instance->scheduled) {
+ if (instance->end_batch_formatting && instance->end_batch_formatting(instance) != 0) {
+ error("EXPORTING: cannot end batch formatting for %s", instance->config.name);
+ disable_instance(instance);
+ continue;
+ }
+ uv_mutex_unlock(&instance->mutex);
+ instance->data_is_ready = 1;
+ uv_cond_signal(&instance->cond_var);
+
+ instance->scheduled = 0;
+ instance->after = instance->before;
+ }
+ }
+}
+
+/**
+ * Prepare buffers
+ *
+ * Walk through the Netdata database and fill buffers for every scheduled exporting connector instance according to
+ * configured rules.
+ *
+ * @param engine an engine data structure.
+ */
+void prepare_buffers(struct engine *engine)
+{
+ netdata_thread_disable_cancelability();
+ start_batch_formatting(engine);
+
+ rrd_rdlock();
+ RRDHOST *host;
+ rrdhost_foreach_read(host)
+ {
+ rrdhost_rdlock(host);
+ start_host_formatting(engine, host);
+ RRDSET *st;
+ rrdset_foreach_read(st, host)
+ {
+ rrdset_rdlock(st);
+ start_chart_formatting(engine, st);
+
+ RRDDIM *rd;
+ rrddim_foreach_read(rd, st)
+ metric_formatting(engine, rd);
+
+ end_chart_formatting(engine, st);
+ rrdset_unlock(st);
+ }
+
+ end_host_formatting(engine, host);
+ rrdhost_unlock(host);
+ }
+ rrd_unlock();
+ netdata_thread_enable_cancelability();
+
+ end_batch_formatting(engine);
+}
+
+/**
+ * Flush a buffer with host labels
+ *
+ * @param instance an instance data structure.
+ * @param host a data collecting host.
+ * @return Always returns 0.
+ */
+int flush_host_labels(struct instance *instance, RRDHOST *host)
+{
+ (void)host;
+
+ if (instance->labels)
+ buffer_flush(instance->labels);
+
+ return 0;
+}
+
+/**
+ * End a batch for a simple connector
+ *
+ * @param instance an instance data structure.
+ * @return Returns 0 on success, 1 on failure.
+ */
+int simple_connector_end_batch(struct instance *instance)
+{
+ struct simple_connector_data *simple_connector_data =
+ (struct simple_connector_data *)instance->connector_specific_data;
+ struct stats *stats = &instance->stats;
+
+ BUFFER *instance_buffer = (BUFFER *)instance->buffer;
+ struct simple_connector_buffer *last_buffer = simple_connector_data->last_buffer;
+
+ if (!last_buffer->buffer) {
+ last_buffer->buffer = buffer_create(0);
+ }
+
+ if (last_buffer->used) {
+ // ring buffer is full, reuse the oldest element
+ simple_connector_data->first_buffer = simple_connector_data->first_buffer->next;
+
+ stats->data_lost_events++;
+ stats->lost_metrics += last_buffer->buffered_metrics;
+ stats->lost_bytes += last_buffer->buffered_bytes;
+ }
+
+ // swap buffers
+ BUFFER *tmp_buffer = last_buffer->buffer;
+ last_buffer->buffer = instance_buffer;
+ instance->buffer = instance_buffer = tmp_buffer;
+
+ buffer_flush(instance_buffer);
+
+ if (last_buffer->header)
+ buffer_flush(last_buffer->header);
+ else
+ last_buffer->header = buffer_create(0);
+
+ if (instance->prepare_header)
+ instance->prepare_header(instance);
+
+ // The stats->buffered_metrics is used in the simple connector batch formatting as a variable for the number
+ // of metrics, added in the current iteration, so we are clearing it here. We will use the
+ // simple_connector_data->total_buffered_metrics in the worker to show the statistics.
+ size_t buffered_metrics = (size_t)stats->buffered_metrics;
+ stats->buffered_metrics = 0;
+
+ size_t buffered_bytes = buffer_strlen(last_buffer->buffer);
+
+ last_buffer->buffered_metrics = buffered_metrics;
+ last_buffer->buffered_bytes = buffered_bytes;
+ last_buffer->used++;
+
+ simple_connector_data->total_buffered_metrics += buffered_metrics;
+ stats->buffered_bytes += buffered_bytes;
+
+ simple_connector_data->last_buffer = simple_connector_data->last_buffer->next;
+
+ return 0;
+}