#include "common.h"
-int connect_to_socket4(const char *ip, int port) {
- int sock;
+#define BACKEND_SOURCE_DATA_AS_COLLECTED 0x00000001
+#define BACKEND_SOURCE_DATA_AVERAGE 0x00000002
+#define BACKEND_SOURCE_DATA_SUM 0x00000004
- debug(D_LISTENER, "IPv4 connecting to ip '%s' port %d", ip, port);
+static inline calculated_number backend_calculate_value_from_stored_data(RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
+ time_t first_t = rrdset_first_entry_t(st);
+ time_t last_t = rrdset_last_entry_t(st);
- sock = socket(AF_INET, SOCK_STREAM, 0);
- if(sock < 0) {
- error("IPv4 socket() on ip '%s' port %d failed.", ip, port);
- return -1;
- }
+ if(unlikely(before < first_t || after > last_t))
+ // the chart has not been updated in the wanted timeframe
+ return NAN;
- struct sockaddr_in name;
- memset(&name, 0, sizeof(struct sockaddr_in));
- name.sin_family = AF_INET;
- name.sin_port = htons(port);
+ // align the time-frame
+ // for 'after' also skip the first value by adding st->update_every
+ after = after - after % st->update_every + st->update_every;
+ before = before - before % st->update_every;
- int ret = inet_pton(AF_INET, ip, (void *)&name.sin_addr.s_addr);
- if(ret != 1) {
- error("Failed to convert '%s' to a valid IPv4 address.", ip);
- close(sock);
- return -1;
- }
+ if(unlikely(after < first_t))
+ after = first_t;
- if(connect(sock, (struct sockaddr *) &name, sizeof(name)) < 0) {
- close(sock);
- error("IPv4 failed to connect to '%s', port %d", ip, port);
- return -1;
- }
+ if(unlikely(after > before))
+ // this can happen when the st->update_every > before - after
+ before = after;
- debug(D_LISTENER, "Connected to IPv4 ip '%s' port %d", ip, port);
- return sock;
-}
+ if(unlikely(before > last_t))
+ before = last_t;
-int connect_to_socket6(const char *ip, int port) {
- int sock = -1;
- int ipv6only = 1;
+ size_t counter = 0;
+ calculated_number sum = 0;
- debug(D_LISTENER, "IPv6 connecting to ip '%s' port %d", ip, port);
+ long start_at_slot = rrdset_time2slot(st, before),
+ stop_at_slot = rrdset_time2slot(st, after),
+ slot, stop_now = 0;
- sock = socket(AF_INET6, SOCK_STREAM, 0);
- if (sock < 0) {
- error("IPv6 socket() on ip '%s' port %d failed.", ip, port);
- return -1;
- }
-
- /* IPv6 only */
- if(setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (void*)&ipv6only, sizeof(ipv6only)) != 0)
- error("Cannot set IPV6_V6ONLY on ip '%s' port's %d.", ip, port);
+ 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;
- struct sockaddr_in6 name;
- memset(&name, 0, sizeof(struct sockaddr_in6));
- name.sin6_family = AF_INET6;
- name.sin6_port = htons ((uint16_t) port);
+ storage_number n = rd->values[slot];
+ if(unlikely(!does_storage_number_exist(n))) continue;
- int ret = inet_pton(AF_INET6, ip, (void *)&name.sin6_addr.s6_addr);
- if(ret != 1) {
- error("Failed to convert IP '%s' to a valid IPv6 address.", ip);
- close(sock);
- return -1;
+ calculated_number value = unpack_storage_number(n);
+ sum += value;
+ counter++;
}
- name.sin6_scope_id = 0;
+ if(unlikely(!counter))
+ return NAN;
- if(connect(sock, (struct sockaddr *)&name, sizeof(name)) < 0) {
- close(sock);
- error("IPv6 failed to connect to '%s', port %d", ip, port);
- return -1;
- }
+ if(unlikely(options & BACKEND_SOURCE_DATA_SUM))
+ return sum;
- debug(D_LISTENER, "Connected to IPv6 ip '%s' port %d", ip, port);
- return sock;
+ return sum / (calculated_number)counter;
}
+static inline int format_dimension_collected_graphite_plaintext(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
+ (void)host;
+ (void)after;
+ (void)before;
+ (void)options;
+ buffer_sprintf(b, "%s.%s.%s.%s " COLLECTED_NUMBER_FORMAT " %u\n", prefix, hostname, st->id, rd->id, rd->last_collected_value, (uint32_t)rd->last_collected_time.tv_sec);
+ return 1;
+}
-static inline int connect_to_one(const char *definition, int default_port) {
- struct addrinfo hints;
- struct addrinfo *result = NULL, *rp = NULL;
-
- char buffer[strlen(definition) + 1];
- strcpy(buffer, definition);
-
- char buffer2[10 + 1];
- snprintfz(buffer2, 10, "%d", default_port);
-
- char *ip = buffer, *port = buffer2;
-
- char *e = ip;
- if(*e == '[') {
- e = ++ip;
- while(*e && *e != ']') e++;
- if(*e == ']') {
- *e = '\0';
- e++;
- }
- }
- else {
- while(*e && *e != ':') e++;
+static inline int format_dimension_stored_graphite_plaintext(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
+ (void)host;
+ calculated_number value = backend_calculate_value_from_stored_data(st, rd, after, before, options);
+ if(!isnan(value)) {
+ buffer_sprintf(b, "%s.%s.%s.%s " CALCULATED_NUMBER_FORMAT " %u\n", prefix, hostname, st->id, rd->id, value, (uint32_t) before);
+ return 1;
}
+ return 0;
+}
- if(*e == ':') {
- port = e + 1;
- *e = '\0';
- }
+static inline int format_dimension_collected_opentsdb_telnet(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
+ (void)host;
+ (void)after;
+ (void)before;
+ (void)options;
+ buffer_sprintf(b, "put %s.%s.%s %u " COLLECTED_NUMBER_FORMAT " host=%s\n", prefix, st->id, rd->id, (uint32_t)rd->last_collected_time.tv_sec, rd->last_collected_value, hostname);
+ return 1;
+}
- if(!*ip)
- return -1;
-
- if(!*port)
- port = buffer2;
-
- memset(&hints, 0, sizeof(struct addrinfo));
- hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */
- hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */
- hints.ai_flags = AI_PASSIVE; /* For wildcard IP address */
- hints.ai_protocol = 0; /* Any protocol */
- hints.ai_canonname = NULL;
- hints.ai_addr = NULL;
- hints.ai_next = NULL;
-
- int r = getaddrinfo(ip, port, &hints, &result);
- if (r != 0) {
- error("Cannot resolve host '%s', port '%s': %s\n", ip, port, gai_strerror(r));
- return -1;
+static inline int format_dimension_stored_opentsdb_telnet(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
+ (void)host;
+ calculated_number value = backend_calculate_value_from_stored_data(st, rd, after, before, options);
+ if(!isnan(value)) {
+ buffer_sprintf(b, "put %s.%s.%s %u " CALCULATED_NUMBER_FORMAT " host=%s\n", prefix, st->id, rd->id, (uint32_t) before, value, hostname);
+ return 1;
}
+ return 0;
+}
- int fd = -1;
- for (rp = result; rp != NULL && fd == -1; rp = rp->ai_next) {
- char rip[INET_ADDRSTRLEN + INET6_ADDRSTRLEN] = "INVALID";
- int rport;
-
- switch (rp->ai_addr->sa_family) {
- case AF_INET: {
- struct sockaddr_in *sin = (struct sockaddr_in *) rp->ai_addr;
- inet_ntop(AF_INET, &sin->sin_addr, rip, INET_ADDRSTRLEN);
- rport = ntohs(sin->sin_port);
- fd = connect_to_socket4(rip, rport);
- break;
- }
+static inline int process_graphite_response(BUFFER *b) {
+ char sample[1024];
+ const char *s = buffer_tostring(b);
+ char *d = sample, *e = &sample[sizeof(sample) - 1];
- case AF_INET6: {
- struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) rp->ai_addr;
- inet_ntop(AF_INET6, &sin6->sin6_addr, rip, INET6_ADDRSTRLEN);
- rport = ntohs(sin6->sin6_port);
- fd = connect_to_socket6(rip, rport);
- break;
- }
- }
+ for(; *s && d < e ;s++) {
+ char c = *s;
+ if(unlikely(!isprint(c))) c = ' ';
+ *d++ = c;
}
+ *d = '\0';
- freeaddrinfo(result);
-
- return fd;
+ info("Received %zu bytes from graphite backend. Ignoring them. Sample: '%s'", buffer_strlen(b), sample);
+ buffer_flush(b);
+ return 0;
}
-static inline void format_dimension_collected_graphite_plaintext(BUFFER *b, const char *prefix, RRDHOST *host, RRDSET *st, RRDDIM *rd, time_t after, time_t before) {
- time_t last = rd->last_collected_time.tv_sec;
- if(likely(last >= after && last < before))
- buffer_sprintf(b, "%s.%s.%s.%s " COLLECTED_NUMBER_FORMAT " %u\n", prefix, host->hostname, st->id, rd->id, rd->last_collected_value, (uint32_t)last);
-}
+static inline int process_opentsdb_response(BUFFER *b) {
+ char sample[1024];
+ const char *s = buffer_tostring(b);
+ char *d = sample, *e = &sample[sizeof(sample) - 1];
-static inline void format_dimension_stored_graphite_plaintext(BUFFER *b, const char *prefix, RRDHOST *host, RRDSET *st, RRDDIM *rd, time_t after, time_t before) {
- time_t last = rd->last_collected_time.tv_sec;
- if(likely(last >= after && last < before))
- buffer_sprintf(b, "%s.%s.%s.%s " CALCULATED_NUMBER_FORMAT " %u\n", prefix, host->hostname, st->id, rd->id, rd->last_stored_value, (uint32_t)last);
-}
-
-static inline void format_dimension_collected_opentsdb_telnet(BUFFER *b, const char *prefix, RRDHOST *host, RRDSET *st, RRDDIM *rd, time_t after, time_t before) {
- time_t last = rd->last_collected_time.tv_sec;
- if(likely(last >= after && last < before))
- buffer_sprintf(b, "put %s.%s.%s %u " COLLECTED_NUMBER_FORMAT " host=%s\n", prefix, st->id, rd->id, (uint32_t)last, rd->last_collected_value, host->hostname);
-}
+ for(; *s && d < e ;s++) {
+ char c = *s;
+ if(unlikely(!isprint(c))) c = ' ';
+ *d++ = c;
+ }
+ *d = '\0';
-static inline void format_dimension_stored_opentsdb_telnet(BUFFER *b, const char *prefix, RRDHOST *host, RRDSET *st, RRDDIM *rd, time_t after, time_t before) {
- time_t last = rd->last_collected_time.tv_sec;
- if(likely(last >= after && last < before))
- buffer_sprintf(b, "put %s.%s.%s %u " CALCULATED_NUMBER_FORMAT " host=%s\n", prefix, st->id, rd->id, (uint32_t)last, rd->last_stored_value, host->hostname);
+ info("Received %zu bytes from opentsdb backend. Ignoring them. Sample: '%s'", buffer_strlen(b), sample);
+ buffer_flush(b);
+ return 0;
}
void *backends_main(void *ptr) {
- (void)ptr;
- BUFFER *b = buffer_create(1);
- void (*formatter)(BUFFER *b, const char *prefix, RRDHOST *host, RRDSET *st, RRDDIM *rd, time_t after, time_t before);
+ struct netdata_static_thread *static_thread = (struct netdata_static_thread *)ptr;
- info("BACKENDs thread created with task id %d", gettid());
+ BUFFER *b = buffer_create(1), *response = buffer_create(1);
+ int (*backend_request_formatter)(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) = NULL;
+ int (*backend_response_checker)(BUFFER *b) = NULL;
+
+ info("BACKEND thread created with task id %d", gettid());
if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
error("Cannot set pthread cancel type to DEFERRED.");
if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
error("Cannot set pthread cancel state to ENABLE.");
+ // ------------------------------------------------------------------------
+ // collect configuration options
+
+ struct timeval timeout = {
+ .tv_sec = 0,
+ .tv_usec = 0
+ };
int default_port = 0;
- int enabled = config_get_boolean("backends", "enable", 0);
- const char *source = config_get("backends", "data source", "as stored");
- const char *type = config_get("backends", "type", "graphite");
- const char *destination = config_get("backends", "destination", "localhost");
- const char *prefix = config_get("backends", "prefix", "netdata");
- int frequency = (int)config_get_number("backends", "update every", 10);
-
- if(!enabled)
+ int sock = -1;
+ uint32_t options;
+ int enabled = config_get_boolean("backend", "enabled", 0);
+ const char *source = config_get("backend", "data source", "average");
+ const char *type = config_get("backend", "type", "graphite");
+ const char *destination = config_get("backend", "destination", "localhost");
+ const char *prefix = config_get("backend", "prefix", "netdata");
+ const char *hostname = config_get("backend", "hostname", localhost->hostname);
+ int frequency = (int)config_get_number("backend", "update every", 10);
+ int buffer_on_failures = (int)config_get_number("backend", "buffer on failures", 10);
+ long timeoutms = config_get_number("backend", "timeout ms", frequency * 2 * 1000);
+
+ // ------------------------------------------------------------------------
+ // validate configuration options
+ // and prepare for sending data to our backend
+
+ if(!enabled || frequency < 1)
+ goto cleanup;
+
+ if(!strcmp(source, "as collected")) {
+ options = BACKEND_SOURCE_DATA_AS_COLLECTED;
+ }
+ else if(!strcmp(source, "average")) {
+ options = BACKEND_SOURCE_DATA_AVERAGE;
+ }
+ else if(!strcmp(source, "sum") || !strcmp(source, "volume")) {
+ options = BACKEND_SOURCE_DATA_SUM;
+ }
+ else {
+ error("Invalid data source method '%s' for backend given. Disabling backed.", source);
goto cleanup;
+ }
+
+ if(timeoutms < 1) {
+ error("BACKED invalid timeout %ld ms given. Assuming %d ms.", timeoutms, frequency * 2 * 1000);
+ timeoutms = frequency * 2 * 1000;
+ }
+ timeout.tv_sec = (timeoutms * 1000) / 1000000;
+ timeout.tv_usec = (timeoutms * 1000) % 1000000;
+
+
+ // ------------------------------------------------------------------------
+ // select the backend type
if(!strcmp(type, "graphite") || !strcmp(type, "graphite:plaintext")) {
default_port = 2003;
- if(!strcmp(source, "as collected"))
- formatter = format_dimension_collected_graphite_plaintext;
+ if(options == BACKEND_SOURCE_DATA_AS_COLLECTED)
+ backend_request_formatter = format_dimension_collected_graphite_plaintext;
else
- formatter = format_dimension_stored_graphite_plaintext;
+ backend_request_formatter = format_dimension_stored_graphite_plaintext;
+
+ backend_response_checker = process_graphite_response;
}
else if(!strcmp(type, "opentsdb") || !strcmp(type, "opentsdb:telnet")) {
- default_port = 2003;
- if(!strcmp(source, "as collected"))
- formatter = format_dimension_collected_opentsdb_telnet;
+ default_port = 4242;
+ if(options == BACKEND_SOURCE_DATA_AS_COLLECTED)
+ backend_request_formatter = format_dimension_collected_opentsdb_telnet;
else
- formatter = format_dimension_stored_opentsdb_telnet;
+ backend_request_formatter = format_dimension_stored_opentsdb_telnet;
+
+ backend_response_checker = process_opentsdb_response;
}
else {
error("Unknown backend type '%s'", type);
goto cleanup;
}
- time_t after, before = (time_t)(time_usec() / 10000000ULL);
+ if(backend_request_formatter == NULL || backend_response_checker == NULL) {
+ error("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", 130600, frequency, 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", 130610, frequency, 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", 130630, frequency, 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", 130620, frequency, 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", 130630, frequency, 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, frequency, hostname, prefix);
+
+ usec_t step_ut = frequency * USEC_PER_SEC;
+ time_t after = now_realtime_sec();
+ int failures = 0;
+ heartbeat_t hb;
+ heartbeat_init(&hb);
- unsigned long long step = frequency * 1000000ULL;
for(;;) {
- unsigned long long now = time_usec();
- unsigned long long next = now - (now % step) + step + (step / 2);
- while(now < next) {
- sleep_usec(next - now);
- now = time_usec();
- }
+ // ------------------------------------------------------------------------
+ // Wait for the next iteration point.
+ heartbeat_next(&hb, step_ut);
+ time_t before = now_realtime_sec();
+
+
+ // ------------------------------------------------------------------------
+ // add to the buffer the data we need to send to the backend
- after = before;
- before = (time_t)(now / 10000000ULL);
- RRDSET *st;
int pthreadoldcancelstate;
- buffer_flush(b);
if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &pthreadoldcancelstate) != 0))
error("Cannot set pthread cancel state to DISABLE.");
- rrdhost_rdlock(&localhost);
- for(st = localhost.rrdset_root; st ;st = st->next) {
- pthread_rwlock_rdlock(&st->rwlock);
- RRDDIM *rd;
- for(rd = st->dimensions; rd ;rd = rd->next) {
- formatter(b, prefix, &localhost, st, rd, after, before);
+ RRDHOST *host;
+ for(host = localhost; host ; host = host->next) {
+ // for each host
+
+ rrdhost_rdlock(host);
+
+ RRDSET *st;
+ for(st = host->rrdset_root; st; st = st->next) {
+ // for each chart
+
+ pthread_rwlock_rdlock(&st->rwlock);
+
+ RRDDIM *rd;
+ for(rd = st->dimensions; rd; rd = rd->next) {
+ // for each dimension
+
+ if(rd->last_collected_time.tv_sec >= after)
+ chart_buffered_metrics += backend_request_formatter(b, prefix, host, (host == localhost)?hostname:host->hostname, st, rd, after, before, options);
+ }
+
+ pthread_rwlock_unlock(&st->rwlock);
}
- pthread_rwlock_unlock(&st->rwlock);
+
+ rrdhost_unlock(host);
}
- rrdhost_unlock(&localhost);
if(unlikely(pthread_setcancelstate(pthreadoldcancelstate, NULL) != 0))
error("Cannot set pthread cancel state to RESTORE (%d).", pthreadoldcancelstate);
+ // ------------------------------------------------------------------------
+
+ 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;
- 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("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();
+ const char *s = destination;
+ while(*s) {
+ const char *e = s;
+
+ // skip separators, moving both s(tart) and e(nd)
+ while(isspace(*e) || *e == ',') s = ++e;
+
+ // move e(nd) to the first separator
+ while(*e && !isspace(*e) && *e != ',') e++;
+
+ // is there anything?
+ if(!*s || s == e) break;
+
+ char buf[e - s + 1];
+ strncpyz(buf, s, e - s);
+ chart_backend_reconnects++;
+ sock = connect_to(buf, default_port, &timeout);
+ if(sock != -1) break;
+ s = e;
+ }
+ 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("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("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("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:
- info("BACKENDs thread exiting");
+ if(sock != -1)
+ close(sock);
+
+ buffer_free(b);
+ buffer_free(response);
+
+ info("BACKEND thread exiting");
+ static_thread->enabled = 0;
pthread_exit(NULL);
return NULL;
}
projects / netdata.git / blobdiff