// SPDX-License-Identifier: GPL-3.0-or-later #include "rrdpush.h" extern struct config stream_config; extern int netdata_use_ssl_on_stream; extern char *netdata_ssl_ca_path; extern char *netdata_ssl_ca_file; // Collector thread starting a transmission void sender_start(struct sender_state *s) { netdata_mutex_lock(&s->mutex); buffer_flush(s->build); } // Collector thread finishing a transmission void sender_commit(struct sender_state *s) { if(cbuffer_add_unsafe(s->host->sender->buffer, buffer_tostring(s->host->sender->build), s->host->sender->build->len)) s->overflow = 1; buffer_flush(s->build); netdata_mutex_unlock(&s->mutex); } static inline void rrdpush_sender_thread_close_socket(RRDHOST *host) { host->rrdpush_sender_connected = 0; if(host->rrdpush_sender_socket != -1) { close(host->rrdpush_sender_socket); host->rrdpush_sender_socket = -1; } } static inline void rrdpush_sender_add_host_variable_to_buffer_nolock(RRDHOST *host, RRDVAR *rv) { calculated_number *value = (calculated_number *)rv->value; buffer_sprintf( host->sender->build , "VARIABLE HOST %s = " CALCULATED_NUMBER_FORMAT "\n" , rv->name , *value ); debug(D_STREAM, "RRDVAR pushed HOST VARIABLE %s = " CALCULATED_NUMBER_FORMAT, rv->name, *value); } void rrdpush_sender_send_this_host_variable_now(RRDHOST *host, RRDVAR *rv) { if(host->rrdpush_send_enabled && host->rrdpush_sender_spawn && host->rrdpush_sender_connected) { sender_start(host->sender); rrdpush_sender_add_host_variable_to_buffer_nolock(host, rv); sender_commit(host->sender); } } static int rrdpush_sender_thread_custom_host_variables_callback(void *rrdvar_ptr, void *host_ptr) { RRDVAR *rv = (RRDVAR *)rrdvar_ptr; RRDHOST *host = (RRDHOST *)host_ptr; if(unlikely(rv->options & RRDVAR_OPTION_CUSTOM_HOST_VAR && rv->type == RRDVAR_TYPE_CALCULATED)) { rrdpush_sender_add_host_variable_to_buffer_nolock(host, rv); // return 1, so that the traversal will return the number of variables sent return 1; } // returning a negative number will break the traversal return 0; } static void rrdpush_sender_thread_send_custom_host_variables(RRDHOST *host) { sender_start(host->sender); int ret = rrdvar_callback_for_all_host_variables(host, rrdpush_sender_thread_custom_host_variables_callback, host); (void)ret; sender_commit(host->sender); debug(D_STREAM, "RRDVAR sent %d VARIABLES", ret); } // resets all the chart, so that their definitions // will be resent to the central netdata static void rrdpush_sender_thread_reset_all_charts(RRDHOST *host) { rrdhost_rdlock(host); RRDSET *st; rrdset_foreach_read(st, host) { rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_EXPOSED); st->upstream_resync_time = 0; rrdset_rdlock(st); RRDDIM *rd; rrddim_foreach_read(rd, st) rd->exposed = 0; rrdset_unlock(st); } rrdhost_unlock(host); } static inline void rrdpush_sender_thread_data_flush(RRDHOST *host) { netdata_mutex_lock(&host->sender->mutex); size_t len = cbuffer_next_unsafe(host->sender->buffer, NULL); if (len) error("STREAM %s [send]: discarding %zu bytes of metrics already in the buffer.", host->hostname, len); cbuffer_remove_unsafe(host->sender->buffer, len); netdata_mutex_unlock(&host->sender->mutex); rrdpush_sender_thread_reset_all_charts(host); rrdpush_sender_thread_send_custom_host_variables(host); } static inline void rrdpush_set_flags_to_newest_stream(RRDHOST *host) { host->labels.labels_flag |= LABEL_FLAG_UPDATE_STREAM; host->labels.labels_flag &= ~LABEL_FLAG_STOP_STREAM; } void rrdpush_encode_variable(stream_encoded_t *se, RRDHOST *host) { se->os_name = (host->system_info->host_os_name)?url_encode(host->system_info->host_os_name):""; se->os_id = (host->system_info->host_os_id)?url_encode(host->system_info->host_os_id):""; se->os_version = (host->system_info->host_os_version)?url_encode(host->system_info->host_os_version):""; se->kernel_name = (host->system_info->kernel_name)?url_encode(host->system_info->kernel_name):""; se->kernel_version = (host->system_info->kernel_version)?url_encode(host->system_info->kernel_version):""; } void rrdpush_clean_encoded(stream_encoded_t *se) { if (se->os_name) freez(se->os_name); if (se->os_id) freez(se->os_id); if (se->os_version) freez(se->os_version); if (se->kernel_name) freez(se->kernel_name); if (se->kernel_version) freez(se->kernel_version); } static int rrdpush_sender_thread_connect_to_parent(RRDHOST *host, int default_port, int timeout, struct sender_state *s) { struct timeval tv = { .tv_sec = timeout, .tv_usec = 0 }; // make sure the socket is closed rrdpush_sender_thread_close_socket(host); debug(D_STREAM, "STREAM: Attempting to connect..."); info("STREAM %s [send to %s]: connecting...", host->hostname, host->rrdpush_send_destination); host->rrdpush_sender_socket = connect_to_one_of( host->rrdpush_send_destination , default_port , &tv , &s->reconnects_counter , s->connected_to , sizeof(s->connected_to)-1 ); if(unlikely(host->rrdpush_sender_socket == -1)) { error("STREAM %s [send to %s]: failed to connect", host->hostname, host->rrdpush_send_destination); return 0; } info("STREAM %s [send to %s]: initializing communication...", host->hostname, s->connected_to); #ifdef ENABLE_HTTPS if( netdata_client_ctx ){ host->ssl.flags = NETDATA_SSL_START; if (!host->ssl.conn){ host->ssl.conn = SSL_new(netdata_client_ctx); if(!host->ssl.conn){ error("Failed to allocate SSL structure."); host->ssl.flags = NETDATA_SSL_NO_HANDSHAKE; } } else{ SSL_clear(host->ssl.conn); } if (host->ssl.conn) { if (SSL_set_fd(host->ssl.conn, host->rrdpush_sender_socket) != 1) { error("Failed to set the socket to the SSL on socket fd %d.", host->rrdpush_sender_socket); host->ssl.flags = NETDATA_SSL_NO_HANDSHAKE; } else{ host->ssl.flags = NETDATA_SSL_HANDSHAKE_COMPLETE; } } } else { host->ssl.flags = NETDATA_SSL_NO_HANDSHAKE; } #endif /* TODO: During the implementation of #7265 switch the set of variables to HOST_* and CONTAINER_* if the version negotiation resulted in a high enough version. */ stream_encoded_t se; rrdpush_encode_variable(&se, host); char http[HTTP_HEADER_SIZE + 1]; int eol = snprintfz(http, HTTP_HEADER_SIZE, "STREAM key=%s&hostname=%s®istry_hostname=%s&machine_guid=%s&update_every=%d&os=%s&timezone=%s&tags=%s&ver=%u" "&NETDATA_SYSTEM_OS_NAME=%s" "&NETDATA_SYSTEM_OS_ID=%s" "&NETDATA_SYSTEM_OS_ID_LIKE=%s" "&NETDATA_SYSTEM_OS_VERSION=%s" "&NETDATA_SYSTEM_OS_VERSION_ID=%s" "&NETDATA_SYSTEM_OS_DETECTION=%s" "&NETDATA_HOST_IS_K8S_NODE=%s" "&NETDATA_SYSTEM_KERNEL_NAME=%s" "&NETDATA_SYSTEM_KERNEL_VERSION=%s" "&NETDATA_SYSTEM_ARCHITECTURE=%s" "&NETDATA_SYSTEM_VIRTUALIZATION=%s" "&NETDATA_SYSTEM_VIRT_DETECTION=%s" "&NETDATA_SYSTEM_CONTAINER=%s" "&NETDATA_SYSTEM_CONTAINER_DETECTION=%s" "&NETDATA_CONTAINER_OS_NAME=%s" "&NETDATA_CONTAINER_OS_ID=%s" "&NETDATA_CONTAINER_OS_ID_LIKE=%s" "&NETDATA_CONTAINER_OS_VERSION=%s" "&NETDATA_CONTAINER_OS_VERSION_ID=%s" "&NETDATA_CONTAINER_OS_DETECTION=%s" "&NETDATA_SYSTEM_CPU_LOGICAL_CPU_COUNT=%s" "&NETDATA_SYSTEM_CPU_FREQ=%s" "&NETDATA_SYSTEM_TOTAL_RAM=%s" "&NETDATA_SYSTEM_TOTAL_DISK_SIZE=%s" "&NETDATA_PROTOCOL_VERSION=%s" " HTTP/1.1\r\n" "User-Agent: %s/%s\r\n" "Accept: */*\r\n\r\n" , host->rrdpush_send_api_key , host->hostname , host->registry_hostname , host->machine_guid , default_rrd_update_every , host->os , host->timezone , (host->tags) ? host->tags : "" , STREAMING_PROTOCOL_CURRENT_VERSION , se.os_name , se.os_id , (host->system_info->host_os_id_like) ? host->system_info->host_os_id_like : "" , se.os_version , (host->system_info->host_os_version_id) ? host->system_info->host_os_version_id : "" , (host->system_info->host_os_detection) ? host->system_info->host_os_detection : "" , (host->system_info->is_k8s_node) ? host->system_info->is_k8s_node : "" , se.kernel_name , se.kernel_version , (host->system_info->architecture) ? host->system_info->architecture : "" , (host->system_info->virtualization) ? host->system_info->virtualization : "" , (host->system_info->virt_detection) ? host->system_info->virt_detection : "" , (host->system_info->container) ? host->system_info->container : "" , (host->system_info->container_detection) ? host->system_info->container_detection : "" , (host->system_info->container_os_name) ? host->system_info->container_os_name : "" , (host->system_info->container_os_id) ? host->system_info->container_os_id : "" , (host->system_info->container_os_id_like) ? host->system_info->container_os_id_like : "" , (host->system_info->container_os_version) ? host->system_info->container_os_version : "" , (host->system_info->container_os_version_id) ? host->system_info->container_os_version_id : "" , (host->system_info->container_os_detection) ? host->system_info->container_os_detection : "" , (host->system_info->host_cores) ? host->system_info->host_cores : "" , (host->system_info->host_cpu_freq) ? host->system_info->host_cpu_freq : "" , (host->system_info->host_ram_total) ? host->system_info->host_ram_total : "" , (host->system_info->host_disk_space) ? host->system_info->host_disk_space : "" , STREAMING_PROTOCOL_VERSION , host->program_name , host->program_version ); http[eol] = 0x00; rrdpush_clean_encoded(&se); #ifdef ENABLE_HTTPS if (!host->ssl.flags) { ERR_clear_error(); SSL_set_connect_state(host->ssl.conn); int err = SSL_connect(host->ssl.conn); if (err != 1){ err = SSL_get_error(host->ssl.conn, err); error("SSL cannot connect with the server: %s ",ERR_error_string((long)SSL_get_error(host->ssl.conn,err),NULL)); if (netdata_use_ssl_on_stream == NETDATA_SSL_FORCE) { rrdpush_sender_thread_close_socket(host); return 0; }else { host->ssl.flags = NETDATA_SSL_NO_HANDSHAKE; } } else { if (netdata_use_ssl_on_stream == NETDATA_SSL_FORCE) { if (netdata_validate_server == NETDATA_SSL_VALID_CERTIFICATE) { if ( security_test_certificate(host->ssl.conn)) { error("Closing the stream connection, because the server SSL certificate is not valid."); rrdpush_sender_thread_close_socket(host); return 0; } } } } } if(send_timeout(&host->ssl,host->rrdpush_sender_socket, http, strlen(http), 0, timeout) == -1) { #else if(send_timeout(host->rrdpush_sender_socket, http, strlen(http), 0, timeout) == -1) { #endif error("STREAM %s [send to %s]: failed to send HTTP header to remote netdata.", host->hostname, s->connected_to); rrdpush_sender_thread_close_socket(host); return 0; } info("STREAM %s [send to %s]: waiting response from remote netdata...", host->hostname, s->connected_to); ssize_t received; #ifdef ENABLE_HTTPS received = recv_timeout(&host->ssl,host->rrdpush_sender_socket, http, HTTP_HEADER_SIZE, 0, timeout); if(received == -1) { #else received = recv_timeout(host->rrdpush_sender_socket, http, HTTP_HEADER_SIZE, 0, timeout); if(received == -1) { #endif error("STREAM %s [send to %s]: remote netdata does not respond.", host->hostname, s->connected_to); rrdpush_sender_thread_close_socket(host); return 0; } http[received] = '\0'; debug(D_STREAM, "Response to sender from far end: %s", http); int answer = -1; char *version_start = strchr(http, '='); int32_t version = -1; if(version_start) { version_start++; version = (int32_t)strtol(version_start, NULL, 10); answer = memcmp(http, START_STREAMING_PROMPT_VN, (size_t)(version_start - http)); if(!answer) { rrdpush_set_flags_to_newest_stream(host); } } else { answer = memcmp(http, START_STREAMING_PROMPT_V2, strlen(START_STREAMING_PROMPT_V2)); if(!answer) { version = 1; rrdpush_set_flags_to_newest_stream(host); } else { answer = memcmp(http, START_STREAMING_PROMPT, strlen(START_STREAMING_PROMPT)); if(!answer) { version = 0; host->labels.labels_flag |= LABEL_FLAG_STOP_STREAM; host->labels.labels_flag &= ~LABEL_FLAG_UPDATE_STREAM; } } } if(version == -1) { error("STREAM %s [send to %s]: server is not replying properly (is it a netdata?).", host->hostname, s->connected_to); rrdpush_sender_thread_close_socket(host); return 0; } s->version = version; info("STREAM %s [send to %s]: established communication with a parent using protocol version %d - ready to send metrics..." , host->hostname , s->connected_to , version); if(sock_setnonblock(host->rrdpush_sender_socket) < 0) error("STREAM %s [send to %s]: cannot set non-blocking mode for socket.", host->hostname, s->connected_to); if(sock_enlarge_out(host->rrdpush_sender_socket) < 0) error("STREAM %s [send to %s]: cannot enlarge the socket buffer.", host->hostname, s->connected_to); debug(D_STREAM, "STREAM: Connected on fd %d...", host->rrdpush_sender_socket); return 1; } static void attempt_to_connect(struct sender_state *state) { state->send_attempts = 0; if(rrdpush_sender_thread_connect_to_parent(state->host, state->default_port, state->timeout, state)) { state->last_sent_t = now_monotonic_sec(); // reset the buffer, to properly send charts and metrics rrdpush_sender_thread_data_flush(state->host); // send from the beginning state->begin = 0; // make sure the next reconnection will be immediate state->not_connected_loops = 0; // reset the bytes we have sent for this session state->sent_bytes_on_this_connection = 0; // let the data collection threads know we are ready state->host->rrdpush_sender_connected = 1; } else { // increase the failed connections counter state->not_connected_loops++; // reset the number of bytes sent state->sent_bytes_on_this_connection = 0; // slow re-connection on repeating errors sleep_usec(USEC_PER_SEC * state->reconnect_delay); // seconds } } // TCP window is open and we have data to transmit. void attempt_to_send(struct sender_state *s) { rrdpush_send_labels(s->host); struct circular_buffer *cb = s->buffer; netdata_thread_disable_cancelability(); netdata_mutex_lock(&s->mutex); char *chunk; size_t outstanding = cbuffer_next_unsafe(s->buffer, &chunk); debug(D_STREAM, "STREAM: Sending data. Buffer r=%zu w=%zu s=%zu, next chunk=%zu", cb->read, cb->write, cb->size, outstanding); ssize_t ret; #ifdef ENABLE_HTTPS SSL *conn = s->host->ssl.conn ; if(conn && !s->host->ssl.flags) { ret = SSL_write(conn, chunk, outstanding); } else { ret = send(s->host->rrdpush_sender_socket, chunk, outstanding, MSG_DONTWAIT); } #else ret = send(s->host->rrdpush_sender_socket, chunk, outstanding, MSG_DONTWAIT); #endif if (likely(ret > 0)) { cbuffer_remove_unsafe(s->buffer, ret); s->sent_bytes_on_this_connection += ret; s->sent_bytes += ret; debug(D_STREAM, "STREAM %s [send to %s]: Sent %zd bytes", s->host->hostname, s->connected_to, ret); s->last_sent_t = now_monotonic_sec(); } else if (ret == -1 && (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) debug(D_STREAM, "STREAM %s [send to %s]: unavailable aftering polling POLLOUT", s->host->hostname, s->connected_to); else if (ret == -1) { debug(D_STREAM, "STREAM: Send failed - closing socket..."); error("STREAM %s [send to %s]: failed to send metrics - closing connection - we have sent %zu bytes on this connection.", s->host->hostname, s->connected_to, s->sent_bytes_on_this_connection); rrdpush_sender_thread_close_socket(s->host); } else { debug(D_STREAM, "STREAM: send() returned 0 -> no error but no transmission"); } netdata_mutex_unlock(&s->mutex); netdata_thread_enable_cancelability(); } void attempt_read(struct sender_state *s) { int ret; #ifdef ENABLE_HTTPS if (s->host->ssl.conn && !s->host->stream_ssl.flags) { ERR_clear_error(); int desired = sizeof(s->read_buffer) - s->read_len - 1; ret = SSL_read(s->host->ssl.conn, s->read_buffer, desired); if (ret > 0 ) { s->read_len += ret; return; } int sslerrno = SSL_get_error(s->host->ssl.conn, desired); if (sslerrno == SSL_ERROR_WANT_READ || sslerrno == SSL_ERROR_WANT_WRITE) return; u_long err; char buf[256]; while ((err = ERR_get_error()) != 0) { ERR_error_string_n(err, buf, sizeof(buf)); error("STREAM %s [send to %s] ssl error: %s", s->host->hostname, s->connected_to, buf); } error("Restarting connection"); rrdpush_sender_thread_close_socket(s->host); return; } #endif ret = recv(s->host->rrdpush_sender_socket, s->read_buffer + s->read_len, sizeof(s->read_buffer) - s->read_len - 1, MSG_DONTWAIT); if (ret>0) { s->read_len += ret; return; } debug(D_STREAM, "Socket was POLLIN, but req %zu bytes gave %d", sizeof(s->read_buffer) - s->read_len - 1, ret); if (ret<0 && (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)) return; if (ret==0) error("STREAM %s [send to %s]: connection closed by far end. Restarting connection", s->host->hostname, s->connected_to); else error("STREAM %s [send to %s]: error during read (%d). Restarting connection", s->host->hostname, s->connected_to, ret); rrdpush_sender_thread_close_socket(s->host); } // This is just a placeholder until the gap filling state machine is inserted void execute_commands(struct sender_state *s) { char *start = s->read_buffer, *end = &s->read_buffer[s->read_len], *newline; *end = 0; while( starthost->hostname, s->connected_to, start); start = newline+1; } if (startread_buffer, start, end-start); s->read_len = end-start; } } static void rrdpush_sender_thread_cleanup_callback(void *ptr) { RRDHOST *host = (RRDHOST *)ptr; netdata_mutex_lock(&host->sender->mutex); info("STREAM %s [send]: sending thread cleans up...", host->hostname); rrdpush_sender_thread_close_socket(host); // close the pipe if(host->rrdpush_sender_pipe[PIPE_READ] != -1) { close(host->rrdpush_sender_pipe[PIPE_READ]); host->rrdpush_sender_pipe[PIPE_READ] = -1; } if(host->rrdpush_sender_pipe[PIPE_WRITE] != -1) { close(host->rrdpush_sender_pipe[PIPE_WRITE]); host->rrdpush_sender_pipe[PIPE_WRITE] = -1; } if(!host->rrdpush_sender_join) { info("STREAM %s [send]: sending thread detaches itself.", host->hostname); netdata_thread_detach(netdata_thread_self()); } host->rrdpush_sender_spawn = 0; info("STREAM %s [send]: sending thread now exits.", host->hostname); netdata_mutex_unlock(&host->sender->mutex); } void sender_init(struct sender_state *s, RRDHOST *parent) { memset(s, 0, sizeof(*s)); s->host = parent; s->buffer = cbuffer_new(1024, 1024*1024); s->build = buffer_create(1); netdata_mutex_init(&s->mutex); } void *rrdpush_sender_thread(void *ptr) { struct sender_state *s = ptr; s->task_id = gettid(); if(!s->host->rrdpush_send_enabled || !s->host->rrdpush_send_destination || !*s->host->rrdpush_send_destination || !s->host->rrdpush_send_api_key || !*s->host->rrdpush_send_api_key) { error("STREAM %s [send]: thread created (task id %d), but host has streaming disabled.", s->host->hostname, s->task_id); return NULL; } #ifdef ENABLE_HTTPS if (netdata_use_ssl_on_stream & NETDATA_SSL_FORCE ){ security_start_ssl(NETDATA_SSL_CONTEXT_STREAMING); security_location_for_context(netdata_client_ctx, netdata_ssl_ca_file, netdata_ssl_ca_path); } #endif info("STREAM %s [send]: thread created (task id %d)", s->host->hostname, s->task_id); s->timeout = (int)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "timeout seconds", 60); s->default_port = (int)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "default port", 19999); s->buffer->max_size = (size_t)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "buffer size bytes", 1024 * 1024); s->reconnect_delay = (unsigned int)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "reconnect delay seconds", 5); remote_clock_resync_iterations = (unsigned int)appconfig_get_number( &stream_config, CONFIG_SECTION_STREAM, "initial clock resync iterations", remote_clock_resync_iterations); // TODO: REMOVE FOR SLEW / GAPFILLING // initialize rrdpush globals s->host->rrdpush_sender_connected = 0; if(pipe(s->host->rrdpush_sender_pipe) == -1) { error("STREAM %s [send]: cannot create required pipe. DISABLING STREAMING THREAD", s->host->hostname); return NULL; } enum { Collector, Socket }; struct pollfd fds[2]; fds[Collector].fd = s->host->rrdpush_sender_pipe[PIPE_READ]; fds[Collector].events = POLLIN; netdata_thread_cleanup_push(rrdpush_sender_thread_cleanup_callback, s->host); for(; s->host->rrdpush_send_enabled && !netdata_exit ;) { // check for outstanding cancellation requests netdata_thread_testcancel(); // The connection attempt blocks (after which we use the socket in nonblocking) if(unlikely(s->host->rrdpush_sender_socket == -1)) { s->overflow = 0; s->read_len = 0; s->buffer->read = 0; s->buffer->write = 0; attempt_to_connect(s); if (s->version >= VERSION_GAP_FILLING) { time_t now = now_realtime_sec(); sender_start(s); buffer_sprintf(s->build, "TIMESTAMP %ld", now); sender_commit(s); } rrdpush_claimed_id(s->host); continue; } // If the TCP window never opened then something is wrong, restart connection if(unlikely(now_monotonic_sec() - s->last_sent_t > s->timeout)) { error("STREAM %s [send to %s]: could not send metrics for %d seconds - closing connection - we have sent %zu bytes on this connection via %zu send attempts.", s->host->hostname, s->connected_to, s->timeout, s->sent_bytes_on_this_connection, s->send_attempts); rrdpush_sender_thread_close_socket(s->host); continue; } // Wait until buffer opens in the socket or a rrdset_done_push wakes us fds[Collector].revents = 0; fds[Socket].revents = 0; fds[Socket].fd = s->host->rrdpush_sender_socket; netdata_mutex_lock(&s->mutex); char *chunk; size_t outstanding = cbuffer_next_unsafe(s->host->sender->buffer, &chunk); chunk = NULL; // Do not cache pointer outside of region - could be invalidated netdata_mutex_unlock(&s->mutex); if(outstanding) { s->send_attempts++; fds[Socket].events = POLLIN | POLLOUT; } else { fds[Socket].events = POLLIN; } int retval = poll(fds, 2, 1000); debug(D_STREAM, "STREAM: poll() finished collector=%d socket=%d (current chunk %zu bytes)...", fds[Collector].revents, fds[Socket].revents, outstanding); if(unlikely(netdata_exit)) break; // Spurious wake-ups without error - loop again if (retval == 0 || ((retval == -1) && (errno == EAGAIN || errno == EINTR))) { debug(D_STREAM, "Spurious wakeup"); continue; } // Only errors from poll() are internal, but try restarting the connection if(unlikely(retval == -1)) { error("STREAM %s [send to %s]: failed to poll(). Closing socket.", s->host->hostname, s->connected_to); rrdpush_sender_thread_close_socket(s->host); continue; } // If the collector woke us up then empty the pipe to remove the signal if (fds[Collector].revents & POLLIN || fds[Collector].revents & POLLPRI) { debug(D_STREAM, "STREAM: Data added to send buffer (current buffer chunk %zu bytes)...", outstanding); char buffer[1000 + 1]; if (read(s->host->rrdpush_sender_pipe[PIPE_READ], buffer, 1000) == -1) error("STREAM %s [send to %s]: cannot read from internal pipe.", s->host->hostname, s->connected_to); } // Read as much as possible to fill the buffer, split into full lines for execution. if (fds[Socket].revents & POLLIN) attempt_read(s); execute_commands(s); // If we have data and have seen the TCP window open then try to close it by a transmission. if (outstanding && fds[Socket].revents & POLLOUT) attempt_to_send(s); // TODO-GAPS - why do we only check this on the socket, not the pipe? if (outstanding) { char *error = NULL; if (unlikely(fds[Socket].revents & POLLERR)) error = "socket reports errors (POLLERR)"; else if (unlikely(fds[Socket].revents & POLLHUP)) error = "connection closed by remote end (POLLHUP)"; else if (unlikely(fds[Socket].revents & POLLNVAL)) error = "connection is invalid (POLLNVAL)"; if(unlikely(error)) { error("STREAM %s [send to %s]: restart stream because %s - %zu bytes transmitted.", s->host->hostname, s->connected_to, error, s->sent_bytes_on_this_connection); rrdpush_sender_thread_close_socket(s->host); } } // protection from overflow if (s->overflow) { errno = 0; error("STREAM %s [send to %s]: buffer full (%zu-bytes) after %zu bytes. Restarting connection", s->host->hostname, s->connected_to, s->buffer->size, s->sent_bytes_on_this_connection); rrdpush_sender_thread_close_socket(s->host); } } netdata_thread_cleanup_pop(1); return NULL; }