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netdata/backends/backends.c

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// SPDX-License-Identifier: GPL-3.0-or-later
#define BACKENDS_INTERNALS
#include "backends.h"
// ----------------------------------------------------------------------------
// How backends work in netdata:
//
// 1. There is an independent thread that runs at the required interval
// (for example, once every 10 seconds)
//
// 2. Every time it wakes, it calls the backend formatting functions to build
// a buffer of data. This is a very fast, memory only operation.
//
// 3. If the buffer already includes data, the new data are appended.
// If the buffer becomes too big, because the data cannot be sent, a
// log is written and the buffer is discarded.
//
// 4. Then it tries to send all the data. It blocks until all the data are sent
// or the socket returns an error.
// If the time required for this is above the interval, it starts skipping
// intervals, but the calculated values include the entire database, without
// gaps (it remembers the timestamps and continues from where it stopped).
//
// 5. repeats the above forever.
//
const char *global_backend_prefix = "netdata";
int global_backend_update_every = 10;
BACKEND_OPTIONS global_backend_options = BACKEND_SOURCE_DATA_AVERAGE | BACKEND_OPTION_SEND_NAMES;
// ----------------------------------------------------------------------------
// helper functions for backends
size_t backend_name_copy(char *d, const char *s, size_t usable) {
size_t n;
for(n = 0; *s && n < usable ; d++, s++, n++) {
char c = *s;
if(c != '.' && !isalnum(c)) *d = '_';
else *d = c;
}
*d = '\0';
return n;
}
// 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
calculated_number backend_calculate_value_from_stored_data(
RRDSET *st // the chart
, RRDDIM *rd // the dimension
, time_t after // the start timestamp
, time_t before // the end timestamp
, BACKEND_OPTIONS backend_options // BACKEND_SOURCE_* bitmap
, time_t *first_timestamp // the first point of the database used in this response
, time_t *last_timestamp // the timestamp that should be reported to backend
) {
RRDHOST *host = st->rrdhost;
(void)host;
// 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, "BACKEND: %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;
}
*first_timestamp = after;
*last_timestamp = before;
size_t counter = 0;
calculated_number sum = 0;
/*
long start_at_slot = rrdset_time2slot(st, before),
stop_at_slot = rrdset_time2slot(st, after),
slot, stop_now = 0;
for(slot = start_at_slot; !stop_now ; slot--) {
if(unlikely(slot < 0)) slot = st->entries - 1;
if(unlikely(slot == stop_at_slot)) stop_now = 1;
storage_number n = rd->values[slot];
if(unlikely(!does_storage_number_exist(n))) {
// not collected
continue;
}
calculated_number value = unpack_storage_number(n);
sum += value;
counter++;
}
*/
for(rd->state->query_ops.init(rd, &handle, after, before) ; !rd->state->query_ops.is_finished(&handle) ; ) {
n = rd->state->query_ops.next_metric(&handle);
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, "BACKEND: %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(BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_SOURCE_DATA_SUM))
return sum;
return sum / (calculated_number)counter;
}
// discard a response received by a backend
// after logging a simple of it to error.log
int discard_response(BUFFER *b, const char *backend) {
char sample[1024];
const char *s = buffer_tostring(b);
char *d = sample, *e = &sample[sizeof(sample) - 1];
for(; *s && d < e ;s++) {
char c = *s;
if(unlikely(!isprint(c))) c = ' ';
*d++ = c;
}
*d = '\0';
info("BACKEND: received %zu bytes from %s backend. Ignoring them. Sample: '%s'", buffer_strlen(b), backend, sample);
buffer_flush(b);
return 0;
}
// ----------------------------------------------------------------------------
// the backend thread
static SIMPLE_PATTERN *charts_pattern = NULL;
static SIMPLE_PATTERN *hosts_pattern = NULL;
inline int backends_can_send_rrdset(BACKEND_OPTIONS backend_options, RRDSET *st) {
RRDHOST *host = st->rrdhost;
(void)host;
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(charts_pattern, st->id) || simple_pattern_matches(charts_pattern, st->name))
rrdset_flag_set(st, RRDSET_FLAG_BACKEND_SEND);
else {
rrdset_flag_set(st, RRDSET_FLAG_BACKEND_IGNORE);
debug(D_BACKEND, "BACKEND: not sending chart '%s' of host '%s', because it is disabled for backends.", st->id, host->hostname);
return 0;
}
}
if(unlikely(!rrdset_is_available_for_backends(st))) {
debug(D_BACKEND, "BACKEND: not sending chart '%s' of host '%s', because it is not available for backends.", st->id, host->hostname);
return 0;
}
if(unlikely(st->rrd_memory_mode == RRD_MEMORY_MODE_NONE && !(BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_SOURCE_DATA_AS_COLLECTED))) {
debug(D_BACKEND, "BACKEND: not sending chart '%s' of host '%s' because its memory mode is '%s' and the backend requires database access.", st->id, host->hostname, rrd_memory_mode_name(host->rrd_memory_mode));
return 0;
}
return 1;
}
inline BACKEND_OPTIONS backend_parse_data_source(const char *source, BACKEND_OPTIONS backend_options) {
if(!strcmp(source, "raw") || !strcmp(source, "as collected") || !strcmp(source, "as-collected") || !strcmp(source, "as_collected") || !strcmp(source, "ascollected")) {
backend_options |= BACKEND_SOURCE_DATA_AS_COLLECTED;
backend_options &= ~(BACKEND_OPTIONS_SOURCE_BITS ^ BACKEND_SOURCE_DATA_AS_COLLECTED);
}
else if(!strcmp(source, "average")) {
backend_options |= BACKEND_SOURCE_DATA_AVERAGE;
backend_options &= ~(BACKEND_OPTIONS_SOURCE_BITS ^ BACKEND_SOURCE_DATA_AVERAGE);
}
else if(!strcmp(source, "sum") || !strcmp(source, "volume")) {
backend_options |= BACKEND_SOURCE_DATA_SUM;
backend_options &= ~(BACKEND_OPTIONS_SOURCE_BITS ^ BACKEND_SOURCE_DATA_SUM);
}
else {
error("BACKEND: invalid data source method '%s'.", source);
}
return backend_options;
}
static void backends_main_cleanup(void *ptr) {
struct netdata_static_thread *static_thread = (struct netdata_static_thread *)ptr;
static_thread->enabled = NETDATA_MAIN_THREAD_EXITING;
info("cleaning up...");
static_thread->enabled = NETDATA_MAIN_THREAD_EXITED;
}
/**
* Set Kinesis variables
*
* Set the variables necessary to work with this specific backend.
*
* @param default_port the default port of the backend
* @param brc function called to check the result.
* @param brf function called to format the message to the backend
*/
void backend_set_kinesis_variables(int *default_port,
backend_response_checker_t brc,
backend_request_formatter_t brf)
{
(void)default_port;
#ifndef HAVE_KINESIS
(void)brc;
(void)brf;
#endif
#if HAVE_KINESIS
*brc = process_json_response;
if (BACKEND_OPTIONS_DATA_SOURCE(global_backend_options) == BACKEND_SOURCE_DATA_AS_COLLECTED)
*brf = format_dimension_collected_json_plaintext;
else
*brf = format_dimension_stored_json_plaintext;
#endif
}
/**
* Set Prometheus variables
*
* Set the variables necessary to work with this specific backend.
*
* @param default_port the default port of the backend
* @param brc function called to check the result.
* @param brf function called to format the message to the backend
*/
void backend_set_prometheus_variables(int *default_port,
backend_response_checker_t brc,
backend_request_formatter_t brf)
{
(void)default_port;
(void)brf;
#ifndef ENABLE_PROMETHEUS_REMOTE_WRITE
(void)brc;
#endif
#if ENABLE_PROMETHEUS_REMOTE_WRITE
*brc = process_prometheus_remote_write_response;
#endif /* ENABLE_PROMETHEUS_REMOTE_WRITE */
}
/**
* Set MongoDB variables
*
* Set the variables necessary to work with this specific backend.
*
* @param default_port the default port of the backend
* @param brc function called to check the result.
* @param brf function called to format the message to the backend
*/
void backend_set_mongodb_variables(int *default_port,
backend_response_checker_t brc,
backend_request_formatter_t brf)
{
(void)default_port;
#ifndef HAVE_MONGOC
(void)brc;
(void)brf;
#endif
#if HAVE_MONGOC
*brc = process_json_response;
if(BACKEND_OPTIONS_DATA_SOURCE(global_backend_options) == BACKEND_SOURCE_DATA_AS_COLLECTED)
*brf = format_dimension_collected_json_plaintext;
else
*brf = format_dimension_stored_json_plaintext;
#endif
}
/**
* Set JSON variables
*
* Set the variables necessary to work with this specific backend.
*
* @param default_port the default port of the backend
* @param brc function called to check the result.
* @param brf function called to format the message to the backend
*/
void backend_set_json_variables(int *default_port,
backend_response_checker_t brc,
backend_request_formatter_t brf)
{
*default_port = 5448;
*brc = process_json_response;
if (BACKEND_OPTIONS_DATA_SOURCE(global_backend_options) == BACKEND_SOURCE_DATA_AS_COLLECTED)
*brf = format_dimension_collected_json_plaintext;
else
*brf = format_dimension_stored_json_plaintext;
}
/**
* Set OpenTSDB HTTP variables
*
* Set the variables necessary to work with this specific backend.
*
* @param default_port the default port of the backend
* @param brc function called to check the result.
* @param brf function called to format the message to the backend
*/
void backend_set_opentsdb_http_variables(int *default_port,
backend_response_checker_t brc,
backend_request_formatter_t brf)
{
*default_port = 4242;
*brc = process_opentsdb_response;
if(BACKEND_OPTIONS_DATA_SOURCE(global_backend_options) == BACKEND_SOURCE_DATA_AS_COLLECTED)
*brf = format_dimension_collected_opentsdb_http;
else
*brf = format_dimension_stored_opentsdb_http;
}
/**
* Set OpenTSDB Telnet variables
*
* Set the variables necessary to work with this specific backend.
*
* @param default_port the default port of the backend
* @param brc function called to check the result.
* @param brf function called to format the message to the backend
*/
void backend_set_opentsdb_telnet_variables(int *default_port,
backend_response_checker_t brc,
backend_request_formatter_t brf)
{
*default_port = 4242;
*brc = process_opentsdb_response;
if(BACKEND_OPTIONS_DATA_SOURCE(global_backend_options) == BACKEND_SOURCE_DATA_AS_COLLECTED)
*brf = format_dimension_collected_opentsdb_telnet;
else
*brf = format_dimension_stored_opentsdb_telnet;
}
/**
* Set Graphite variables
*
* Set the variables necessary to work with this specific backend.
*
* @param default_port the default port of the backend
* @param brc function called to check the result.
* @param brf function called to format the message to the backend
*/
void backend_set_graphite_variables(int *default_port,
backend_response_checker_t brc,
backend_request_formatter_t brf)
{
*default_port = 2003;
*brc = process_graphite_response;
if(BACKEND_OPTIONS_DATA_SOURCE(global_backend_options) == BACKEND_SOURCE_DATA_AS_COLLECTED)
*brf = format_dimension_collected_graphite_plaintext;
else
*brf = format_dimension_stored_graphite_plaintext;
}
/**
* Select Type
*
* Select the backedn type based in the user input
*
* @param type is the string that defines the backend type
*
* @return It returns the backend id.
*/
BACKEND_TYPE backend_select_type(const char *type) {
if(!strcmp(type, "graphite") || !strcmp(type, "graphite:plaintext")) {
return BACKEND_TYPE_GRAPHITE;
}
else if(!strcmp(type, "opentsdb") || !strcmp(type, "opentsdb:telnet")) {
return BACKEND_TYPE_OPENTSDB_USING_TELNET;
}
else if(!strcmp(type, "opentsdb:http") || !strcmp(type, "opentsdb:https")) {
return BACKEND_TYPE_OPENTSDB_USING_HTTP;
}
else if (!strcmp(type, "json") || !strcmp(type, "json:plaintext")) {
return BACKEND_TYPE_JSON;
}
else if (!strcmp(type, "prometheus_remote_write")) {
return BACKEND_TYPE_PROMETEUS;
}
else if (!strcmp(type, "kinesis") || !strcmp(type, "kinesis:plaintext")) {
return BACKEND_TYPE_KINESIS;
}
else if (!strcmp(type, "mongodb") || !strcmp(type, "mongodb:plaintext")) {
return BACKEND_TYPE_MONGODB;
}
return BACKEND_TYPE_UNKNOWN;
}
/**
* Backend main
*
* The main thread used to control the backedns.
*
* @param ptr a pointer to netdata_static_structure.
*
* @return It always return NULL.
*/
void *backends_main(void *ptr) {
netdata_thread_cleanup_push(backends_main_cleanup, ptr);
int default_port = 0;
int sock = -1;
BUFFER *b = buffer_create(1), *response = buffer_create(1);
int (*backend_request_formatter)(BUFFER *, const char *, RRDHOST *, const char *, RRDSET *, RRDDIM *, time_t, time_t, BACKEND_OPTIONS) = NULL;
int (*backend_response_checker)(BUFFER *) = NULL;
#if HAVE_KINESIS
int do_kinesis = 0;
char *kinesis_auth_key_id = NULL, *kinesis_secure_key = NULL, *kinesis_stream_name = NULL;
#endif
#if ENABLE_PROMETHEUS_REMOTE_WRITE
int do_prometheus_remote_write = 0;
BUFFER *http_request_header = NULL;
#endif
#if HAVE_MONGOC
int do_mongodb = 0;
char *mongodb_uri = NULL;
char *mongodb_database = NULL;
char *mongodb_collection = NULL;
// set the default socket timeout in ms
int32_t mongodb_default_socket_timeout = (int32_t)(global_backend_update_every >= 2)?(global_backend_update_every * MSEC_PER_SEC - 500):1000;
#endif
#ifdef ENABLE_HTTPS
struct netdata_ssl opentsdb_ssl = {NULL , NETDATA_SSL_START};
#endif
// ------------------------------------------------------------------------
// collect configuration options
struct timeval timeout = {
.tv_sec = 0,
.tv_usec = 0
};
int enabled = config_get_boolean(CONFIG_SECTION_BACKEND, "enabled", 0);
const char *source = config_get(CONFIG_SECTION_BACKEND, "data source", "average");
const char *type = config_get(CONFIG_SECTION_BACKEND, "type", "graphite");
const char *destination = config_get(CONFIG_SECTION_BACKEND, "destination", "localhost");
global_backend_prefix = config_get(CONFIG_SECTION_BACKEND, "prefix", "netdata");
const char *hostname = config_get(CONFIG_SECTION_BACKEND, "hostname", localhost->hostname);
global_backend_update_every = (int)config_get_number(CONFIG_SECTION_BACKEND, "update every", global_backend_update_every);
int buffer_on_failures = (int)config_get_number(CONFIG_SECTION_BACKEND, "buffer on failures", 10);
long timeoutms = config_get_number(CONFIG_SECTION_BACKEND, "timeout ms", global_backend_update_every * 2 * 1000);
if(config_get_boolean(CONFIG_SECTION_BACKEND, "send names instead of ids", (global_backend_options & BACKEND_OPTION_SEND_NAMES)))
global_backend_options |= BACKEND_OPTION_SEND_NAMES;
else
global_backend_options &= ~BACKEND_OPTION_SEND_NAMES;
charts_pattern = simple_pattern_create(config_get(CONFIG_SECTION_BACKEND, "send charts matching", "*"), NULL, SIMPLE_PATTERN_EXACT);
hosts_pattern = simple_pattern_create(config_get(CONFIG_SECTION_BACKEND, "send hosts matching", "localhost *"), NULL, SIMPLE_PATTERN_EXACT);
#if ENABLE_PROMETHEUS_REMOTE_WRITE
const char *remote_write_path = config_get(CONFIG_SECTION_BACKEND, "remote write URL path", "/receive");
#endif
// ------------------------------------------------------------------------
// validate configuration options
// and prepare for sending data to our backend
global_backend_options = backend_parse_data_source(source, global_backend_options);
if(timeoutms < 1) {
error("BACKEND: invalid timeout %ld ms given. Assuming %d ms.", timeoutms, global_backend_update_every * 2 * 1000);
timeoutms = global_backend_update_every * 2 * 1000;
}
timeout.tv_sec = (timeoutms * 1000) / 1000000;
timeout.tv_usec = (timeoutms * 1000) % 1000000;
if(!enabled || global_backend_update_every < 1)
goto cleanup;
// ------------------------------------------------------------------------
// select the backend type
BACKEND_TYPE work_type = backend_select_type(type);
if (work_type == BACKEND_TYPE_UNKNOWN) {
error("BACKEND: Unknown backend type '%s'", type);
goto cleanup;
}
switch (work_type) {
case BACKEND_TYPE_OPENTSDB_USING_HTTP: {
#ifdef ENABLE_HTTPS
if (!strcmp(type, "opentsdb:https")) {
security_start_ssl(NETDATA_SSL_CONTEXT_OPENTSDB);
}
#endif
backend_set_opentsdb_http_variables(&default_port,&backend_response_checker,&backend_request_formatter);
break;
}
case BACKEND_TYPE_PROMETEUS: {
#if ENABLE_PROMETHEUS_REMOTE_WRITE
do_prometheus_remote_write = 1;
http_request_header = buffer_create(1);
init_write_request();
#else
error("BACKEND: Prometheus remote write support isn't compiled");
#endif // ENABLE_PROMETHEUS_REMOTE_WRITE
backend_set_prometheus_variables(&default_port,&backend_response_checker,&backend_request_formatter);
break;
}
case BACKEND_TYPE_KINESIS: {
#if HAVE_KINESIS
do_kinesis = 1;
if(unlikely(read_kinesis_conf(netdata_configured_user_config_dir, &kinesis_auth_key_id, &kinesis_secure_key, &kinesis_stream_name))) {
error("BACKEND: kinesis backend type is set but cannot read its configuration from %s/aws_kinesis.conf", netdata_configured_user_config_dir);
goto cleanup;
}
kinesis_init(destination, kinesis_auth_key_id, kinesis_secure_key, timeout.tv_sec * 1000 + timeout.tv_usec / 1000);
#else
error("BACKEND: AWS Kinesis support isn't compiled");
#endif // HAVE_KINESIS
backend_set_kinesis_variables(&default_port,&backend_response_checker,&backend_request_formatter);
break;
}
case BACKEND_TYPE_MONGODB: {
#if HAVE_MONGOC
if(unlikely(read_mongodb_conf(netdata_configured_user_config_dir,
&mongodb_uri,
&mongodb_database,
&mongodb_collection))) {
error("BACKEND: mongodb backend type is set but cannot read its configuration from %s/mongodb.conf",
netdata_configured_user_config_dir);
goto cleanup;
}
if(likely(!mongodb_init(mongodb_uri, mongodb_database, mongodb_collection, mongodb_default_socket_timeout))) {
backend_set_mongodb_variables(&default_port, &backend_response_checker, &backend_request_formatter);
do_mongodb = 1;
}
else {
error("BACKEND: cannot initialize MongoDB backend");
goto cleanup;
}
#else
error("BACKEND: MongoDB support isn't compiled");
#endif // HAVE_MONGOC
break;
}
case BACKEND_TYPE_GRAPHITE: {
backend_set_graphite_variables(&default_port,&backend_response_checker,&backend_request_formatter);
break;
}
case BACKEND_TYPE_OPENTSDB_USING_TELNET: {
backend_set_opentsdb_telnet_variables(&default_port,&backend_response_checker,&backend_request_formatter);
break;
}
case BACKEND_TYPE_JSON: {
backend_set_json_variables(&default_port,&backend_response_checker,&backend_request_formatter);
break;
}
case BACKEND_TYPE_UNKNOWN: {
break;
}
}
#if ENABLE_PROMETHEUS_REMOTE_WRITE
if((backend_request_formatter == NULL && !do_prometheus_remote_write) || backend_response_checker == NULL) {
#else
if(backend_request_formatter == NULL || backend_response_checker == NULL) {
#endif
error("BACKEND: backend is misconfigured - disabling it.");
goto cleanup;
}
// ------------------------------------------------------------------------
// prepare the charts for monitoring the backend operation
struct rusage thread;
collected_number
chart_buffered_metrics = 0,
chart_lost_metrics = 0,
chart_sent_metrics = 0,
chart_buffered_bytes = 0,
chart_received_bytes = 0,
chart_sent_bytes = 0,
chart_receptions = 0,
chart_transmission_successes = 0,
chart_transmission_failures = 0,
chart_data_lost_events = 0,
chart_lost_bytes = 0,
chart_backend_reconnects = 0;
// chart_backend_latency = 0;
RRDSET *chart_metrics = rrdset_create_localhost("netdata", "backend_metrics", NULL, "backend", NULL, "Netdata Buffered Metrics", "metrics", "backends", NULL, 130600, global_backend_update_every, RRDSET_TYPE_LINE);
rrddim_add(chart_metrics, "buffered", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
rrddim_add(chart_metrics, "lost", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
rrddim_add(chart_metrics, "sent", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
RRDSET *chart_bytes = rrdset_create_localhost("netdata", "backend_bytes", NULL, "backend", NULL, "Netdata Backend Data Size", "KiB", "backends", NULL, 130610, global_backend_update_every, RRDSET_TYPE_AREA);
rrddim_add(chart_bytes, "buffered", NULL, 1, 1024, RRD_ALGORITHM_ABSOLUTE);
rrddim_add(chart_bytes, "lost", NULL, 1, 1024, RRD_ALGORITHM_ABSOLUTE);
rrddim_add(chart_bytes, "sent", NULL, 1, 1024, RRD_ALGORITHM_ABSOLUTE);
rrddim_add(chart_bytes, "received", NULL, 1, 1024, RRD_ALGORITHM_ABSOLUTE);
RRDSET *chart_ops = rrdset_create_localhost("netdata", "backend_ops", NULL, "backend", NULL, "Netdata Backend Operations", "operations", "backends", NULL, 130630, global_backend_update_every, RRDSET_TYPE_LINE);
rrddim_add(chart_ops, "write", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
rrddim_add(chart_ops, "discard", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
rrddim_add(chart_ops, "reconnect", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
rrddim_add(chart_ops, "failure", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
rrddim_add(chart_ops, "read", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
/*
* this is misleading - we can only measure the time we need to send data
* this time is not related to the time required for the data to travel to
* the backend database and the time that server needed to process them
*
* issue #1432 and https://www.softlab.ntua.gr/facilities/documentation/unix/unix-socket-faq/unix-socket-faq-2.html
*
RRDSET *chart_latency = rrdset_create_localhost("netdata", "backend_latency", NULL, "backend", NULL, "Netdata Backend Latency", "ms", "backends", NULL, 130620, global_backend_update_every, RRDSET_TYPE_AREA);
rrddim_add(chart_latency, "latency", NULL, 1, 1000, RRD_ALGORITHM_ABSOLUTE);
*/
RRDSET *chart_rusage = rrdset_create_localhost("netdata", "backend_thread_cpu", NULL, "backend", NULL, "NetData Backend Thread CPU usage", "milliseconds/s", "backends", NULL, 130630, global_backend_update_every, RRDSET_TYPE_STACKED);
rrddim_add(chart_rusage, "user", NULL, 1, 1000, RRD_ALGORITHM_INCREMENTAL);
rrddim_add(chart_rusage, "system", NULL, 1, 1000, RRD_ALGORITHM_INCREMENTAL);
// ------------------------------------------------------------------------
// prepare the backend main loop
info("BACKEND: configured ('%s' on '%s' sending '%s' data, every %d seconds, as host '%s', with prefix '%s')", type, destination, source, global_backend_update_every, hostname, global_backend_prefix);
usec_t step_ut = global_backend_update_every * USEC_PER_SEC;
time_t after = now_realtime_sec();
int failures = 0;
heartbeat_t hb;
heartbeat_init(&hb);
while(!netdata_exit) {
// ------------------------------------------------------------------------
// Wait for the next iteration point.
heartbeat_next(&hb, step_ut);
time_t before = now_realtime_sec();
debug(D_BACKEND, "BACKEND: preparing buffer for timeframe %lu to %lu", (unsigned long)after, (unsigned long)before);
// ------------------------------------------------------------------------
// add to the buffer the data we need to send to the backend
netdata_thread_disable_cancelability();
size_t count_hosts = 0;
size_t count_charts_total = 0;
size_t count_dims_total = 0;
#if ENABLE_PROMETHEUS_REMOTE_WRITE
if(do_prometheus_remote_write)
clear_write_request();
#endif
rrd_rdlock();
RRDHOST *host;
rrdhost_foreach_read(host) {
if(unlikely(!rrdhost_flag_check(host, RRDHOST_FLAG_BACKEND_SEND|RRDHOST_FLAG_BACKEND_DONT_SEND))) {
char *name = (host == localhost)?"localhost":host->hostname;
if (!hosts_pattern || simple_pattern_matches(hosts_pattern, name)) {
rrdhost_flag_set(host, RRDHOST_FLAG_BACKEND_SEND);
info("enabled backend for host '%s'", name);
}
else {
rrdhost_flag_set(host, RRDHOST_FLAG_BACKEND_DONT_SEND);
info("disabled backend for host '%s'", name);
}
}
if(unlikely(!rrdhost_flag_check(host, RRDHOST_FLAG_BACKEND_SEND)))
continue;
rrdhost_rdlock(host);
count_hosts++;
size_t count_charts = 0;
size_t count_dims = 0;
size_t count_dims_skipped = 0;
const char *__hostname = (host == localhost)?hostname:host->hostname;
#if ENABLE_PROMETHEUS_REMOTE_WRITE
if(do_prometheus_remote_write) {
rrd_stats_remote_write_allmetrics_prometheus(
host
, __hostname
, global_backend_prefix
, global_backend_options
, after
, before
, &count_charts
, &count_dims
, &count_dims_skipped
);
chart_buffered_metrics += count_dims;
}
else
#endif
{
RRDSET *st;
rrdset_foreach_read(st, host) {
if(likely(backends_can_send_rrdset(global_backend_options, st))) {
rrdset_rdlock(st);
count_charts++;
RRDDIM *rd;
rrddim_foreach_read(rd, st) {
if (likely(rd->last_collected_time.tv_sec >= after)) {
chart_buffered_metrics += backend_request_formatter(b, global_backend_prefix, host, __hostname, st, rd, after, before, global_backend_options);
count_dims++;
}
else {
debug(D_BACKEND, "BACKEND: not sending dimension '%s' of chart '%s' from host '%s', its last data collection (%lu) is not within our timeframe (%lu to %lu)", rd->id, st->id, __hostname, (unsigned long)rd->last_collected_time.tv_sec, (unsigned long)after, (unsigned long)before);
count_dims_skipped++;
}
}
rrdset_unlock(st);
}
}
}
debug(D_BACKEND, "BACKEND: sending host '%s', metrics of %zu dimensions, of %zu charts. Skipped %zu dimensions.", __hostname, count_dims, count_charts, count_dims_skipped);
count_charts_total += count_charts;
count_dims_total += count_dims;
rrdhost_unlock(host);
}
rrd_unlock();
netdata_thread_enable_cancelability();
debug(D_BACKEND, "BACKEND: buffer has %zu bytes, added metrics for %zu dimensions, of %zu charts, from %zu hosts", buffer_strlen(b), count_dims_total, count_charts_total, count_hosts);
// ------------------------------------------------------------------------
chart_buffered_bytes = (collected_number)buffer_strlen(b);
// reset the monitoring chart counters
chart_received_bytes =
chart_sent_bytes =
chart_sent_metrics =
chart_lost_metrics =
chart_receptions =
chart_transmission_successes =
chart_transmission_failures =
chart_data_lost_events =
chart_lost_bytes =
chart_backend_reconnects = 0;
// chart_backend_latency = 0;
if(unlikely(netdata_exit)) break;
//fprintf(stderr, "\nBACKEND BEGIN:\n%s\nBACKEND END\n", buffer_tostring(b));
//fprintf(stderr, "after = %lu, before = %lu\n", after, before);
// prepare for the next iteration
// to add incrementally data to buffer
after = before;
#if HAVE_KINESIS
if(do_kinesis) {
unsigned long long partition_key_seq = 0;
size_t buffer_len = buffer_strlen(b);
size_t sent = 0;
while(sent < buffer_len) {
char partition_key[KINESIS_PARTITION_KEY_MAX + 1];
snprintf(partition_key, KINESIS_PARTITION_KEY_MAX, "netdata_%llu", partition_key_seq++);
size_t partition_key_len = strnlen(partition_key, KINESIS_PARTITION_KEY_MAX);
const char *first_char = buffer_tostring(b) + sent;
size_t record_len = 0;
// split buffer into chunks of maximum allowed size
if(buffer_len - sent < KINESIS_RECORD_MAX - partition_key_len) {
record_len = buffer_len - sent;
}
else {
record_len = KINESIS_RECORD_MAX - partition_key_len;
while(*(first_char + record_len) != '\n' && record_len) record_len--;
}
char error_message[ERROR_LINE_MAX + 1] = "";
debug(D_BACKEND, "BACKEND: kinesis_put_record(): dest = %s, id = %s, key = %s, stream = %s, partition_key = %s, \
buffer = %zu, record = %zu", destination, kinesis_auth_key_id, kinesis_secure_key, kinesis_stream_name,
partition_key, buffer_len, record_len);
kinesis_put_record(kinesis_stream_name, partition_key, first_char, record_len);
sent += record_len;
chart_transmission_successes++;
size_t sent_bytes = 0, lost_bytes = 0;
if(unlikely(kinesis_get_result(error_message, &sent_bytes, &lost_bytes))) {
// oops! we couldn't send (all or some of the) data
error("BACKEND: %s", error_message);
error("BACKEND: failed to write data to database backend '%s'. Willing to write %zu bytes, wrote %zu bytes.",
destination, sent_bytes, sent_bytes - lost_bytes);
chart_transmission_failures++;
chart_data_lost_events++;
chart_lost_bytes += lost_bytes;
// estimate the number of lost metrics
chart_lost_metrics += (collected_number)(chart_buffered_metrics
* (buffer_len && (lost_bytes > buffer_len) ? (double)lost_bytes / buffer_len : 1));
break;
}
else {
chart_receptions++;
}
if(unlikely(netdata_exit)) break;
}
chart_sent_bytes += sent;
if(likely(sent == buffer_len))
chart_sent_metrics = chart_buffered_metrics;
buffer_flush(b);
} else
#endif /* HAVE_KINESIS */
#if HAVE_MONGOC
if(do_mongodb) {
size_t buffer_len = buffer_strlen(b);
size_t sent = 0;
while(sent < buffer_len) {
const char *first_char = buffer_tostring(b);
debug(D_BACKEND, "BACKEND: mongodb_insert(): uri = %s, database = %s, collection = %s, \
buffer = %zu", mongodb_uri, mongodb_database, mongodb_collection, buffer_len);
if(likely(!mongodb_insert((char *)first_char, (size_t)chart_buffered_metrics))) {
sent += buffer_len;
chart_transmission_successes++;
chart_receptions++;
}
else {
// oops! we couldn't send (all or some of the) data
error("BACKEND: failed to write data to database backend '%s'. Willing to write %zu bytes, wrote %zu bytes.",
mongodb_uri, buffer_len, 0UL);
chart_transmission_failures++;
chart_data_lost_events++;
chart_lost_bytes += buffer_len;
// estimate the number of lost metrics
chart_lost_metrics += (collected_number)chart_buffered_metrics;
break;
}
if(unlikely(netdata_exit)) break;
}
chart_sent_bytes += sent;
if(likely(sent == buffer_len))
chart_sent_metrics = chart_buffered_metrics;
buffer_flush(b);
} else
#endif /* HAVE_MONGOC */
{
// ------------------------------------------------------------------------
// if we are connected, receive a response, without blocking
if(likely(sock != -1)) {
errno = 0;
// loop through to collect all data
while(sock != -1 && errno != EWOULDBLOCK) {
buffer_need_bytes(response, 4096);
ssize_t r;
#ifdef ENABLE_HTTPS
if(opentsdb_ssl.conn && !opentsdb_ssl.flags) {
r = SSL_read(opentsdb_ssl.conn, &response->buffer[response->len], response->size - response->len);
} else {
r = recv(sock, &response->buffer[response->len], response->size - response->len, MSG_DONTWAIT);
}
#else
r = recv(sock, &response->buffer[response->len], response->size - response->len, MSG_DONTWAIT);
#endif
if(likely(r > 0)) {
// we received some data
response->len += r;
chart_received_bytes += r;
chart_receptions++;
}
else if(r == 0) {
error("BACKEND: '%s' closed the socket", destination);
close(sock);
sock = -1;
}
else {
// failed to receive data
if(errno != EAGAIN && errno != EWOULDBLOCK) {
error("BACKEND: cannot receive data from backend '%s'.", destination);
}
}
}
// if we received data, process them
if(buffer_strlen(response))
backend_response_checker(response);
}
// ------------------------------------------------------------------------
// if we are not connected, connect to a backend server
if(unlikely(sock == -1)) {
// usec_t start_ut = now_monotonic_usec();
size_t reconnects = 0;
sock = connect_to_one_of(destination, default_port, &timeout, &reconnects, NULL, 0);
#ifdef ENABLE_HTTPS
if(sock != -1) {
if(netdata_opentsdb_ctx) {
if(!opentsdb_ssl.conn) {
opentsdb_ssl.conn = SSL_new(netdata_opentsdb_ctx);
if(!opentsdb_ssl.conn) {
error("Failed to allocate SSL structure %d.", sock);
opentsdb_ssl.flags = NETDATA_SSL_NO_HANDSHAKE;
}
} else {
SSL_clear(opentsdb_ssl.conn);
}
}
if(opentsdb_ssl.conn) {
if(SSL_set_fd(opentsdb_ssl.conn, sock) != 1) {
error("Failed to set the socket to the SSL on socket fd %d.", host->rrdpush_sender_socket);
opentsdb_ssl.flags = NETDATA_SSL_NO_HANDSHAKE;
} else {
opentsdb_ssl.flags = NETDATA_SSL_HANDSHAKE_COMPLETE;
SSL_set_connect_state(opentsdb_ssl.conn);
int err = SSL_connect(opentsdb_ssl.conn);
if (err != 1) {
err = SSL_get_error(opentsdb_ssl.conn, err);
error("SSL cannot connect with the server: %s ", ERR_error_string((long)SSL_get_error(opentsdb_ssl.conn, err), NULL));
opentsdb_ssl.flags = NETDATA_SSL_NO_HANDSHAKE;
} //TODO: check certificate here
}
}
}
#endif
chart_backend_reconnects += reconnects;
// chart_backend_latency += now_monotonic_usec() - start_ut;
}
if(unlikely(netdata_exit)) break;
// ------------------------------------------------------------------------
// if we are connected, send our buffer to the backend server
if(likely(sock != -1)) {
size_t len = buffer_strlen(b);
// usec_t start_ut = now_monotonic_usec();
int flags = 0;
#ifdef MSG_NOSIGNAL
flags += MSG_NOSIGNAL;
#endif
#if ENABLE_PROMETHEUS_REMOTE_WRITE
if(do_prometheus_remote_write) {
size_t data_size = get_write_request_size();
if(unlikely(!data_size)) {
error("BACKEND: write request size is out of range");
continue;
}
buffer_flush(b);
buffer_need_bytes(b, data_size);
if(unlikely(pack_write_request(b->buffer, &data_size))) {
error("BACKEND: cannot pack write request");
continue;
}
b->len = data_size;
chart_buffered_bytes = (collected_number)buffer_strlen(b);
buffer_flush(http_request_header);
buffer_sprintf(http_request_header,
"POST %s HTTP/1.1\r\n"
"Host: %s\r\n"
"Accept: */*\r\n"
"Content-Length: %zu\r\n"
"Content-Type: application/x-www-form-urlencoded\r\n\r\n",
remote_write_path,
hostname,
data_size
);
len = buffer_strlen(http_request_header);
send(sock, buffer_tostring(http_request_header), len, flags);
len = data_size;
}
#endif
ssize_t written;
#ifdef ENABLE_HTTPS
if(opentsdb_ssl.conn && !opentsdb_ssl.flags) {
written = SSL_write(opentsdb_ssl.conn, buffer_tostring(b), len);
} else {
written = send(sock, buffer_tostring(b), len, flags);
}
#else
written = send(sock, buffer_tostring(b), len, flags);
#endif
// chart_backend_latency += now_monotonic_usec() - start_ut;
if(written != -1 && (size_t)written == len) {
// we sent the data successfully
chart_transmission_successes++;
chart_sent_bytes += written;
chart_sent_metrics = chart_buffered_metrics;
// reset the failures count
failures = 0;
// empty the buffer
buffer_flush(b);
}
else {
// oops! we couldn't send (all or some of the) data
error("BACKEND: failed to write data to database backend '%s'. Willing to write %zu bytes, wrote %zd bytes. Will re-connect.", destination, len, written);
chart_transmission_failures++;
if(written != -1)
chart_sent_bytes += written;
// increment the counter we check for data loss
failures++;
// close the socket - we will re-open it next time
close(sock);
sock = -1;
}
}
else {
error("BACKEND: failed to update database backend '%s'", destination);
chart_transmission_failures++;
// increment the counter we check for data loss
failures++;
}
}
#if ENABLE_PROMETHEUS_REMOTE_WRITE
if(do_prometheus_remote_write && failures) {
(void) buffer_on_failures;
failures = 0;
chart_lost_bytes = chart_buffered_bytes = get_write_request_size(); // estimated write request size
chart_data_lost_events++;
chart_lost_metrics = chart_buffered_metrics;
} else
#endif
if(failures > buffer_on_failures) {
// too bad! we are going to lose data
chart_lost_bytes += buffer_strlen(b);
error("BACKEND: reached %d backend failures. Flushing buffers to protect this host - this results in data loss on back-end server '%s'", failures, destination);
buffer_flush(b);
failures = 0;
chart_data_lost_events++;
chart_lost_metrics = chart_buffered_metrics;
}
if(unlikely(netdata_exit)) break;
// ------------------------------------------------------------------------
// update the monitoring charts
if(likely(chart_ops->counter_done)) rrdset_next(chart_ops);
rrddim_set(chart_ops, "read", chart_receptions);
rrddim_set(chart_ops, "write", chart_transmission_successes);
rrddim_set(chart_ops, "discard", chart_data_lost_events);
rrddim_set(chart_ops, "failure", chart_transmission_failures);
rrddim_set(chart_ops, "reconnect", chart_backend_reconnects);
rrdset_done(chart_ops);
if(likely(chart_metrics->counter_done)) rrdset_next(chart_metrics);
rrddim_set(chart_metrics, "buffered", chart_buffered_metrics);
rrddim_set(chart_metrics, "lost", chart_lost_metrics);
rrddim_set(chart_metrics, "sent", chart_sent_metrics);
rrdset_done(chart_metrics);
if(likely(chart_bytes->counter_done)) rrdset_next(chart_bytes);
rrddim_set(chart_bytes, "buffered", chart_buffered_bytes);
rrddim_set(chart_bytes, "lost", chart_lost_bytes);
rrddim_set(chart_bytes, "sent", chart_sent_bytes);
rrddim_set(chart_bytes, "received", chart_received_bytes);
rrdset_done(chart_bytes);
/*
if(likely(chart_latency->counter_done)) rrdset_next(chart_latency);
rrddim_set(chart_latency, "latency", chart_backend_latency);
rrdset_done(chart_latency);
*/
getrusage(RUSAGE_THREAD, &thread);
if(likely(chart_rusage->counter_done)) rrdset_next(chart_rusage);
rrddim_set(chart_rusage, "user", thread.ru_utime.tv_sec * 1000000ULL + thread.ru_utime.tv_usec);
rrddim_set(chart_rusage, "system", thread.ru_stime.tv_sec * 1000000ULL + thread.ru_stime.tv_usec);
rrdset_done(chart_rusage);
if(likely(buffer_strlen(b) == 0))
chart_buffered_metrics = 0;
if(unlikely(netdata_exit)) break;
}
cleanup:
#if HAVE_KINESIS
if(do_kinesis) {
kinesis_shutdown();
freez(kinesis_auth_key_id);
freez(kinesis_secure_key);
freez(kinesis_stream_name);
}
#endif
#if ENABLE_PROMETHEUS_REMOTE_WRITE
buffer_free(http_request_header);
if(do_prometheus_remote_write)
protocol_buffers_shutdown();
#endif
#if HAVE_MONGOC
if(do_mongodb) {
mongodb_cleanup();
freez(mongodb_uri);
freez(mongodb_database);
freez(mongodb_collection);
}
#endif
if(sock != -1)
close(sock);
buffer_free(b);
buffer_free(response);
#ifdef ENABLE_HTTPS
if(netdata_opentsdb_ctx) {
if(opentsdb_ssl.conn) {
SSL_free(opentsdb_ssl.conn);
}
}
#endif
netdata_thread_cleanup_pop(1);
return NULL;
}
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