// destroy the cache and free all the memory it uses
void web_client_cache_destroy(void) {
#ifdef NETDATA_INTERNAL_CHECKS
if(unlikely(web_clients_cache.pid != 0 && web_clients_cache.pid != gettid()))
error("Oops! wrong thread accessing the cache. Expected %d, found %d", (int)web_clients_cache.pid, (int)gettid());
web_client_cache_verify(1);
#endif
netdata_thread_disable_cancelability();
struct web_client *w, *t;
w = web_clients_cache.used;
while(w) {
t = w;
w = w->next;
web_client_free(t);
}
web_clients_cache.used = NULL;
web_clients_cache.used_count = 0;
w = web_clients_cache.avail;
while(w) {
t = w;
w = w->next;
web_client_free(t);
}
web_clients_cache.avail = NULL;
web_clients_cache.avail_count = 0;
netdata_thread_enable_cancelability();
}
void web_client_release(struct web_client *w) {
#ifdef NETDATA_INTERNAL_CHECKS
if(unlikely(web_clients_cache.pid != 0 && web_clients_cache.pid != gettid()))
error("Oops! wrong thread accessing the cache. Expected %d, found %d", (int)web_clients_cache.pid, (int)gettid());
if(unlikely(w->running))
error("%llu: releasing web client from %s port %s, but it still running.", w->id, w->client_ip, w->client_port);
#endif
debug(D_WEB_CLIENT_ACCESS, "%llu: Closing web client from %s port %s.", w->id, w->client_ip, w->client_port);
web_server_log_connection(w, "DISCONNECTED");
web_client_request_done(w);
web_client_disconnected();
netdata_thread_disable_cancelability();
if(web_server_mode != WEB_SERVER_MODE_STATIC_THREADED) {
if (w->ifd != -1) close(w->ifd);
if (w->ofd != -1 && w->ofd != w->ifd) close(w->ofd);
w->ifd = w->ofd = -1;
}
// unlink it from the used
if (w == web_clients_cache.used) web_clients_cache.used = w->next;
if(w->prev) w->prev->next = w->next;
if(w->next) w->next->prev = w->prev;
web_clients_cache.used_count--;
if(web_clients_cache.avail_count >= 2 * web_clients_cache.used_count) {
// we have too many of them - free it
web_client_free(w);
}
else {
// link it to the avail
if (web_clients_cache.avail) web_clients_cache.avail->prev = w;
w->next = web_clients_cache.avail;
w->prev = NULL;
web_clients_cache.avail = w;
web_clients_cache.avail_count++;
}
netdata_thread_enable_cancelability();
}
struct web_client *web_client_get_from_cache_or_allocate() {
#ifdef NETDATA_INTERNAL_CHECKS
if(unlikely(web_clients_cache.pid == 0))
web_clients_cache.pid = gettid();
if(unlikely(web_clients_cache.pid != 0 && web_clients_cache.pid != gettid()))
error("Oops! wrong thread accessing the cache. Expected %d, found %d", (int)web_clients_cache.pid, (int)gettid());
#endif
netdata_thread_disable_cancelability();
struct web_client *w = web_clients_cache.avail;
if(w) {
// get it from avail
if (w == web_clients_cache.avail) web_clients_cache.avail = w->next;
if(w->prev) w->prev->next = w->next;
if(w->next) w->next->prev = w->prev;
web_clients_cache.avail_count--;
web_client_zero(w);
web_clients_cache.reused++;
}
else {
// allocate it
w = web_client_alloc();
web_clients_cache.allocated++;
}
// link it to used web clients
if (web_clients_cache.used) web_clients_cache.used->prev = w;
w->next = web_clients_cache.used;
w->prev = NULL;
web_clients_cache.used = w;
web_clients_cache.used_count++;
// initialize it
w->id = web_client_connected();
w->mode = WEB_CLIENT_MODE_NORMAL;
netdata_thread_enable_cancelability();
return w;
}
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, uint32_t) = NULL;
int (*backend_response_checker)(BUFFER *) = NULL;
// ------------------------------------------------------------------------
// 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");
backend_prefix = config_get(CONFIG_SECTION_BACKEND, "prefix", "netdata");
const char *hostname = config_get(CONFIG_SECTION_BACKEND, "hostname", localhost->hostname);
backend_update_every = (int)config_get_number(CONFIG_SECTION_BACKEND, "update every", 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", backend_update_every * 2 * 1000);
backend_send_names = config_get_boolean(CONFIG_SECTION_BACKEND, "send names instead of ids", backend_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);
// ------------------------------------------------------------------------
// validate configuration options
// and prepare for sending data to our backend
backend_options = backend_parse_data_source(source, backend_options);
if(timeoutms < 1) {
error("BACKEND: invalid timeout %ld ms given. Assuming %d ms.", timeoutms, backend_update_every * 2 * 1000);
timeoutms = backend_update_every * 2 * 1000;
}
timeout.tv_sec = (timeoutms * 1000) / 1000000;
timeout.tv_usec = (timeoutms * 1000) % 1000000;
if(!enabled || backend_update_every < 1)
goto cleanup;
// ------------------------------------------------------------------------
// select the backend type
if(!strcmp(type, "graphite") || !strcmp(type, "graphite:plaintext")) {
default_port = 2003;
backend_response_checker = process_graphite_response;
if((backend_options & BACKEND_SOURCE_BITS) == BACKEND_SOURCE_DATA_AS_COLLECTED)
backend_request_formatter = format_dimension_collected_graphite_plaintext;
else
backend_request_formatter = format_dimension_stored_graphite_plaintext;
}
else if(!strcmp(type, "opentsdb") || !strcmp(type, "opentsdb:telnet")) {
default_port = 4242;
backend_response_checker = process_opentsdb_response;
if((backend_options & BACKEND_SOURCE_BITS) == BACKEND_SOURCE_DATA_AS_COLLECTED)
backend_request_formatter = format_dimension_collected_opentsdb_telnet;
else
backend_request_formatter = format_dimension_stored_opentsdb_telnet;
}
else if (!strcmp(type, "json") || !strcmp(type, "json:plaintext")) {
default_port = 5448;
backend_response_checker = process_json_response;
if ((backend_options & BACKEND_SOURCE_BITS) == BACKEND_SOURCE_DATA_AS_COLLECTED)
backend_request_formatter = format_dimension_collected_json_plaintext;
else
backend_request_formatter = format_dimension_stored_json_plaintext;
}
else {
error("BACKEND: Unknown backend type '%s'", type);
goto cleanup;
}
if(backend_request_formatter == NULL || backend_response_checker == NULL) {
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, 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", "KB", "backends", NULL, 130610, 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, 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, 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, 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, backend_update_every, hostname, backend_prefix);
usec_t step_ut = 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;
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;
RRDSET *st;
rrdset_foreach_read(st, host) {
if(likely(backends_can_send_rrdset(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, backend_prefix, host, __hostname, st, rd, after, before, 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_transmission_successes =
chart_transmission_failures =
chart_data_lost_events =
chart_lost_bytes =
chart_backend_reconnects =
chart_backend_latency = 0;
if(unlikely(netdata_exit)) break;
//fprintf(stderr, "\nBACKEND BEGIN:\n%s\nBACKEND END\n", buffer_tostring(b)); // FIXME
//fprintf(stderr, "after = %lu, before = %lu\n", after, before);
// prepare for the next iteration
// to add incrementally data to buffer
after = before;
// ------------------------------------------------------------------------
// 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 = recv(sock, &response->buffer[response->len], response->size - response->len, MSG_DONTWAIT);
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);
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
ssize_t written = send(sock, buffer_tostring(b), len, flags);
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(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(sock != -1)
close(sock);
buffer_free(b);
buffer_free(response);
netdata_thread_cleanup_pop(1);
return NULL;
}