diff options
Diffstat (limited to 'streaming/sender.c')
| -rw-r--r-- | streaming/sender.c | 1865 |
1 files changed, 1865 insertions, 0 deletions
diff --git a/streaming/sender.c b/streaming/sender.c new file mode 100644 index 00000000..09b67e96 --- /dev/null +++ b/streaming/sender.c @@ -0,0 +1,1865 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#include "rrdpush.h" +#include "common.h" +#include "aclk/https_client.h" + +#define WORKER_SENDER_JOB_CONNECT 0 +#define WORKER_SENDER_JOB_PIPE_READ 1 +#define WORKER_SENDER_JOB_SOCKET_RECEIVE 2 +#define WORKER_SENDER_JOB_EXECUTE 3 +#define WORKER_SENDER_JOB_SOCKET_SEND 4 +#define WORKER_SENDER_JOB_DISCONNECT_BAD_HANDSHAKE 5 +#define WORKER_SENDER_JOB_DISCONNECT_OVERFLOW 6 +#define WORKER_SENDER_JOB_DISCONNECT_TIMEOUT 7 +#define WORKER_SENDER_JOB_DISCONNECT_POLL_ERROR 8 +#define WORKER_SENDER_JOB_DISCONNECT_SOCKET_ERROR 9 +#define WORKER_SENDER_JOB_DISCONNECT_SSL_ERROR 10 +#define WORKER_SENDER_JOB_DISCONNECT_PARENT_CLOSED 11 +#define WORKER_SENDER_JOB_DISCONNECT_RECEIVE_ERROR 12 +#define WORKER_SENDER_JOB_DISCONNECT_SEND_ERROR 13 +#define WORKER_SENDER_JOB_DISCONNECT_NO_COMPRESSION 14 +#define WORKER_SENDER_JOB_BUFFER_RATIO 15 +#define WORKER_SENDER_JOB_BYTES_RECEIVED 16 +#define WORKER_SENDER_JOB_BYTES_SENT 17 +#define WORKER_SENDER_JOB_BYTES_COMPRESSED 18 +#define WORKER_SENDER_JOB_BYTES_UNCOMPRESSED 19 +#define WORKER_SENDER_JOB_BYTES_COMPRESSION_RATIO 20 +#define WORKER_SENDER_JOB_REPLAY_REQUEST 21 +#define WORKER_SENDER_JOB_FUNCTION_REQUEST 22 +#define WORKER_SENDER_JOB_REPLAY_DICT_SIZE 23 +#define WORKER_SENDER_JOB_DISCONNECT_CANT_UPGRADE_CONNECTION 24 + +#if WORKER_UTILIZATION_MAX_JOB_TYPES < 25 +#error WORKER_UTILIZATION_MAX_JOB_TYPES has to be at least 25 +#endif + +extern struct config stream_config; +extern char *netdata_ssl_ca_path; +extern char *netdata_ssl_ca_file; + +static __thread BUFFER *sender_thread_buffer = NULL; +static __thread bool sender_thread_buffer_used = false; +static __thread time_t sender_thread_buffer_last_reset_s = 0; + +void sender_thread_buffer_free(void) { + buffer_free(sender_thread_buffer); + sender_thread_buffer = NULL; + sender_thread_buffer_used = false; +} + +// Collector thread starting a transmission +BUFFER *sender_start(struct sender_state *s) { + if(unlikely(sender_thread_buffer_used)) + fatal("STREAMING: thread buffer is used multiple times concurrently."); + + if(unlikely(rrdpush_sender_last_buffer_recreate_get(s) > sender_thread_buffer_last_reset_s)) { + if(unlikely(sender_thread_buffer && sender_thread_buffer->size > THREAD_BUFFER_INITIAL_SIZE)) { + buffer_free(sender_thread_buffer); + sender_thread_buffer = NULL; + } + } + + if(unlikely(!sender_thread_buffer)) { + sender_thread_buffer = buffer_create(THREAD_BUFFER_INITIAL_SIZE, &netdata_buffers_statistics.buffers_streaming); + sender_thread_buffer_last_reset_s = rrdpush_sender_last_buffer_recreate_get(s); + } + + sender_thread_buffer_used = true; + buffer_flush(sender_thread_buffer); + return sender_thread_buffer; +} + +static inline void rrdpush_sender_thread_close_socket(RRDHOST *host); + +#define SENDER_BUFFER_ADAPT_TO_TIMES_MAX_SIZE 3 + +// Collector thread finishing a transmission +void sender_commit(struct sender_state *s, BUFFER *wb, STREAM_TRAFFIC_TYPE type) { + + if(unlikely(wb != sender_thread_buffer)) + fatal("STREAMING: sender is trying to commit a buffer that is not this thread's buffer."); + + if(unlikely(!sender_thread_buffer_used)) + fatal("STREAMING: sender is committing a buffer twice."); + + sender_thread_buffer_used = false; + + char *src = (char *)buffer_tostring(wb); + size_t src_len = buffer_strlen(wb); + + if(unlikely(!src || !src_len)) + return; + + sender_lock(s); + +#ifdef NETDATA_LOG_STREAM_SENDER + if(type == STREAM_TRAFFIC_TYPE_METADATA) { + if(!s->stream_log_fp) { + char filename[FILENAME_MAX + 1]; + snprintfz(filename, FILENAME_MAX, "/tmp/stream-sender-%s.txt", s->host ? rrdhost_hostname(s->host) : "unknown"); + + s->stream_log_fp = fopen(filename, "w"); + } + + fprintf(s->stream_log_fp, "\n--- SEND MESSAGE START: %s ----\n" + "%s" + "--- SEND MESSAGE END ----------------------------------------\n" + , rrdhost_hostname(s->host), src + ); + } +#endif + + if(unlikely(s->buffer->max_size < (src_len + 1) * SENDER_BUFFER_ADAPT_TO_TIMES_MAX_SIZE)) { + netdata_log_info("STREAM %s [send to %s]: max buffer size of %zu is too small for a data message of size %zu. Increasing the max buffer size to %d times the max data message size.", + rrdhost_hostname(s->host), s->connected_to, s->buffer->max_size, buffer_strlen(wb) + 1, SENDER_BUFFER_ADAPT_TO_TIMES_MAX_SIZE); + + s->buffer->max_size = (src_len + 1) * SENDER_BUFFER_ADAPT_TO_TIMES_MAX_SIZE; + } + + if (s->compressor.initialized) { + while(src_len) { + size_t size_to_compress = src_len; + + if(unlikely(size_to_compress > COMPRESSION_MAX_MSG_SIZE)) { + if (stream_has_capability(s, STREAM_CAP_BINARY)) + size_to_compress = COMPRESSION_MAX_MSG_SIZE; + else { + if (size_to_compress > COMPRESSION_MAX_MSG_SIZE) { + // we need to find the last newline + // so that the decompressor will have a whole line to work with + + const char *t = &src[COMPRESSION_MAX_MSG_SIZE]; + while (--t >= src) + if (unlikely(*t == '\n')) + break; + + if (t <= src) { + size_to_compress = COMPRESSION_MAX_MSG_SIZE; + } else + size_to_compress = t - src + 1; + } + } + } + + const char *dst; + size_t dst_len = rrdpush_compress(&s->compressor, src, size_to_compress, &dst); + if (!dst_len) { + netdata_log_error("STREAM %s [send to %s]: COMPRESSION failed. Resetting compressor and re-trying", + rrdhost_hostname(s->host), s->connected_to); + + rrdpush_compression_initialize(s); + dst_len = rrdpush_compress(&s->compressor, src, size_to_compress, &dst); + if(!dst_len) { + netdata_log_error("STREAM %s [send to %s]: COMPRESSION failed again. Deactivating compression", + rrdhost_hostname(s->host), s->connected_to); + + worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_NO_COMPRESSION); + rrdpush_compression_deactivate(s); + rrdpush_sender_thread_close_socket(s->host); + sender_unlock(s); + return; + } + } + + rrdpush_signature_t signature = rrdpush_compress_encode_signature(dst_len); + +#ifdef NETDATA_INTERNAL_CHECKS + // check if reversing the signature provides the same length + size_t decoded_dst_len = rrdpush_decompress_decode_signature((const char *)&signature, sizeof(signature)); + if(decoded_dst_len != dst_len) + fatal("RRDPUSH COMPRESSION: invalid signature, original payload %zu bytes, " + "compressed payload length %zu bytes, but signature says payload is %zu bytes", + size_to_compress, dst_len, decoded_dst_len); +#endif + + if(cbuffer_add_unsafe(s->buffer, (const char *)&signature, sizeof(signature))) + s->flags |= SENDER_FLAG_OVERFLOW; + else { + if(cbuffer_add_unsafe(s->buffer, dst, dst_len)) + s->flags |= SENDER_FLAG_OVERFLOW; + else + s->sent_bytes_on_this_connection_per_type[type] += dst_len + sizeof(signature); + } + + src = src + size_to_compress; + src_len -= size_to_compress; + } + } + else if(cbuffer_add_unsafe(s->buffer, src, src_len)) + s->flags |= SENDER_FLAG_OVERFLOW; + else + s->sent_bytes_on_this_connection_per_type[type] += src_len; + + replication_recalculate_buffer_used_ratio_unsafe(s); + + bool signal_sender = false; + if(!rrdpush_sender_pipe_has_pending_data(s)) { + rrdpush_sender_pipe_set_pending_data(s); + signal_sender = true; + } + + sender_unlock(s); + + if(signal_sender && (!stream_has_capability(s, STREAM_CAP_INTERPOLATED) || type != STREAM_TRAFFIC_TYPE_DATA)) + rrdpush_signal_sender_to_wake_up(s); +} + +static inline void rrdpush_sender_add_host_variable_to_buffer(BUFFER *wb, const RRDVAR_ACQUIRED *rva) { + buffer_sprintf( + wb + , "VARIABLE HOST %s = " NETDATA_DOUBLE_FORMAT "\n" + , rrdvar_name(rva) + , rrdvar2number(rva) + ); + + netdata_log_debug(D_STREAM, "RRDVAR pushed HOST VARIABLE %s = " NETDATA_DOUBLE_FORMAT, rrdvar_name(rva), rrdvar2number(rva)); +} + +void rrdpush_sender_send_this_host_variable_now(RRDHOST *host, const RRDVAR_ACQUIRED *rva) { + if(rrdhost_can_send_definitions_to_parent(host)) { + BUFFER *wb = sender_start(host->sender); + rrdpush_sender_add_host_variable_to_buffer(wb, rva); + sender_commit(host->sender, wb, STREAM_TRAFFIC_TYPE_METADATA); + sender_thread_buffer_free(); + } +} + +struct custom_host_variables_callback { + BUFFER *wb; +}; + +static int rrdpush_sender_thread_custom_host_variables_callback(const DICTIONARY_ITEM *item __maybe_unused, void *rrdvar_ptr __maybe_unused, void *struct_ptr) { + const RRDVAR_ACQUIRED *rv = (const RRDVAR_ACQUIRED *)item; + struct custom_host_variables_callback *tmp = struct_ptr; + BUFFER *wb = tmp->wb; + + if(unlikely(rrdvar_flags(rv) & RRDVAR_FLAG_CUSTOM_HOST_VAR && rrdvar_type(rv) == RRDVAR_TYPE_CALCULATED)) { + rrdpush_sender_add_host_variable_to_buffer(wb, rv); + return 1; + } + return 0; +} + +static void rrdpush_sender_thread_send_custom_host_variables(RRDHOST *host) { + if(rrdhost_can_send_definitions_to_parent(host)) { + BUFFER *wb = sender_start(host->sender); + struct custom_host_variables_callback tmp = { + .wb = wb + }; + int ret = rrdvar_walkthrough_read(host->rrdvars, rrdpush_sender_thread_custom_host_variables_callback, &tmp); + (void)ret; + sender_commit(host->sender, wb, STREAM_TRAFFIC_TYPE_METADATA); + sender_thread_buffer_free(); + + netdata_log_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) { + RRDSET *st; + rrdset_foreach_read(st, host) { + rrdset_flag_clear(st, RRDSET_FLAG_SENDER_REPLICATION_IN_PROGRESS); + rrdset_flag_set(st, RRDSET_FLAG_SENDER_REPLICATION_FINISHED); + + st->rrdpush.sender.resync_time_s = 0; + + RRDDIM *rd; + rrddim_foreach_read(rd, st) + rrddim_metadata_exposed_upstream_clear(rd); + rrddim_foreach_done(rd); + + rrdset_metadata_updated(st); + } + rrdset_foreach_done(st); + + rrdhost_sender_replicating_charts_zero(host); +} + +static void rrdpush_sender_cbuffer_recreate_timed(struct sender_state *s, time_t now_s, bool have_mutex, bool force) { + static __thread time_t last_reset_time_s = 0; + + if(!force && now_s - last_reset_time_s < 300) + return; + + if(!have_mutex) + sender_lock(s); + + rrdpush_sender_last_buffer_recreate_set(s, now_s); + last_reset_time_s = now_s; + + if(s->buffer && s->buffer->size > CBUFFER_INITIAL_SIZE) { + size_t max = s->buffer->max_size; + cbuffer_free(s->buffer); + s->buffer = cbuffer_new(CBUFFER_INITIAL_SIZE, max, &netdata_buffers_statistics.cbuffers_streaming); + } + + sender_thread_buffer_free(); + + if(!have_mutex) + sender_unlock(s); +} + +static void rrdpush_sender_cbuffer_flush(RRDHOST *host) { + rrdpush_sender_set_flush_time(host->sender); + + sender_lock(host->sender); + + // flush the output buffer from any data it may have + cbuffer_flush(host->sender->buffer); + rrdpush_sender_cbuffer_recreate_timed(host->sender, now_monotonic_sec(), true, true); + replication_recalculate_buffer_used_ratio_unsafe(host->sender); + + sender_unlock(host->sender); +} + +static void rrdpush_sender_charts_and_replication_reset(RRDHOST *host) { + rrdpush_sender_set_flush_time(host->sender); + + // stop all replication commands inflight + replication_sender_delete_pending_requests(host->sender); + + // reset the state of all charts + rrdpush_sender_thread_reset_all_charts(host); + + rrdpush_sender_replicating_charts_zero(host->sender); +} + +static void rrdpush_sender_on_connect(RRDHOST *host) { + rrdpush_sender_cbuffer_flush(host); + rrdpush_sender_charts_and_replication_reset(host); +} + +static void rrdpush_sender_after_connect(RRDHOST *host) { + rrdpush_sender_thread_send_custom_host_variables(host); +} + +static inline void rrdpush_sender_thread_close_socket(RRDHOST *host) { +#ifdef ENABLE_HTTPS + netdata_ssl_close(&host->sender->ssl); +#endif + + if(host->sender->rrdpush_sender_socket != -1) { + close(host->sender->rrdpush_sender_socket); + host->sender->rrdpush_sender_socket = -1; + } + + rrdhost_flag_clear(host, RRDHOST_FLAG_RRDPUSH_SENDER_READY_4_METRICS); + rrdhost_flag_clear(host, RRDHOST_FLAG_RRDPUSH_SENDER_CONNECTED); + + // do not flush the circular buffer here + // this function is called sometimes with the mutex lock, sometimes without the lock + rrdpush_sender_charts_and_replication_reset(host); +} + +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):strdupz(""); + se->os_id = (host->system_info->host_os_id)?url_encode(host->system_info->host_os_id):strdupz(""); + se->os_version = (host->system_info->host_os_version)?url_encode(host->system_info->host_os_version):strdupz(""); + se->kernel_name = (host->system_info->kernel_name)?url_encode(host->system_info->kernel_name):strdupz(""); + se->kernel_version = (host->system_info->kernel_version)?url_encode(host->system_info->kernel_version):strdupz(""); +} + +void rrdpush_clean_encoded(stream_encoded_t *se) { + if (se->os_name) { + freez(se->os_name); + se->os_name = NULL; + } + + if (se->os_id) { + freez(se->os_id); + se->os_id = NULL; + } + + if (se->os_version) { + freez(se->os_version); + se->os_version = NULL; + } + + if (se->kernel_name) { + freez(se->kernel_name); + se->kernel_name = NULL; + } + + if (se->kernel_version) { + freez(se->kernel_version); + se->kernel_version = NULL; + } +} + +struct { + const char *response; + const char *status; + size_t length; + int32_t version; + bool dynamic; + const char *error; + int worker_job_id; + int postpone_reconnect_seconds; + ND_LOG_FIELD_PRIORITY priority; +} stream_responses[] = { + { + .response = START_STREAMING_PROMPT_VN, + .length = sizeof(START_STREAMING_PROMPT_VN) - 1, + .status = RRDPUSH_STATUS_CONNECTED, + .version = STREAM_HANDSHAKE_OK_V3, // and above + .dynamic = true, // dynamic = we will parse the version / capabilities + .error = NULL, + .worker_job_id = 0, + .postpone_reconnect_seconds = 0, + .priority = NDLP_INFO, + }, + { + .response = START_STREAMING_PROMPT_V2, + .length = sizeof(START_STREAMING_PROMPT_V2) - 1, + .status = RRDPUSH_STATUS_CONNECTED, + .version = STREAM_HANDSHAKE_OK_V2, + .dynamic = false, + .error = NULL, + .worker_job_id = 0, + .postpone_reconnect_seconds = 0, + .priority = NDLP_INFO, + }, + { + .response = START_STREAMING_PROMPT_V1, + .length = sizeof(START_STREAMING_PROMPT_V1) - 1, + .status = RRDPUSH_STATUS_CONNECTED, + .version = STREAM_HANDSHAKE_OK_V1, + .dynamic = false, + .error = NULL, + .worker_job_id = 0, + .postpone_reconnect_seconds = 0, + .priority = NDLP_INFO, + }, + { + .response = START_STREAMING_ERROR_SAME_LOCALHOST, + .length = sizeof(START_STREAMING_ERROR_SAME_LOCALHOST) - 1, + .status = RRDPUSH_STATUS_LOCALHOST, + .version = STREAM_HANDSHAKE_ERROR_LOCALHOST, + .dynamic = false, + .error = "remote server rejected this stream, the host we are trying to stream is its localhost", + .worker_job_id = WORKER_SENDER_JOB_DISCONNECT_BAD_HANDSHAKE, + .postpone_reconnect_seconds = 60 * 60, // the IP may change, try it every hour + .priority = NDLP_DEBUG, + }, + { + .response = START_STREAMING_ERROR_ALREADY_STREAMING, + .length = sizeof(START_STREAMING_ERROR_ALREADY_STREAMING) - 1, + .status = RRDPUSH_STATUS_ALREADY_CONNECTED, + .version = STREAM_HANDSHAKE_ERROR_ALREADY_CONNECTED, + .dynamic = false, + .error = "remote server rejected this stream, the host we are trying to stream is already streamed to it", + .worker_job_id = WORKER_SENDER_JOB_DISCONNECT_BAD_HANDSHAKE, + .postpone_reconnect_seconds = 2 * 60, // 2 minutes + .priority = NDLP_DEBUG, + }, + { + .response = START_STREAMING_ERROR_NOT_PERMITTED, + .length = sizeof(START_STREAMING_ERROR_NOT_PERMITTED) - 1, + .status = RRDPUSH_STATUS_PERMISSION_DENIED, + .version = STREAM_HANDSHAKE_ERROR_DENIED, + .dynamic = false, + .error = "remote server denied access, probably we don't have the right API key?", + .worker_job_id = WORKER_SENDER_JOB_DISCONNECT_BAD_HANDSHAKE, + .postpone_reconnect_seconds = 1 * 60, // 1 minute + .priority = NDLP_ERR, + }, + { + .response = START_STREAMING_ERROR_BUSY_TRY_LATER, + .length = sizeof(START_STREAMING_ERROR_BUSY_TRY_LATER) - 1, + .status = RRDPUSH_STATUS_RATE_LIMIT, + .version = STREAM_HANDSHAKE_BUSY_TRY_LATER, + .dynamic = false, + .error = "remote server is currently busy, we should try later", + .worker_job_id = WORKER_SENDER_JOB_DISCONNECT_BAD_HANDSHAKE, + .postpone_reconnect_seconds = 2 * 60, // 2 minutes + .priority = NDLP_NOTICE, + }, + { + .response = START_STREAMING_ERROR_INTERNAL_ERROR, + .length = sizeof(START_STREAMING_ERROR_INTERNAL_ERROR) - 1, + .status = RRDPUSH_STATUS_INTERNAL_SERVER_ERROR, + .version = STREAM_HANDSHAKE_INTERNAL_ERROR, + .dynamic = false, + .error = "remote server is encountered an internal error, we should try later", + .worker_job_id = WORKER_SENDER_JOB_DISCONNECT_BAD_HANDSHAKE, + .postpone_reconnect_seconds = 5 * 60, // 5 minutes + .priority = NDLP_CRIT, + }, + { + .response = START_STREAMING_ERROR_INITIALIZATION, + .length = sizeof(START_STREAMING_ERROR_INITIALIZATION) - 1, + .status = RRDPUSH_STATUS_INITIALIZATION_IN_PROGRESS, + .version = STREAM_HANDSHAKE_INITIALIZATION, + .dynamic = false, + .error = "remote server is initializing, we should try later", + .worker_job_id = WORKER_SENDER_JOB_DISCONNECT_BAD_HANDSHAKE, + .postpone_reconnect_seconds = 2 * 60, // 2 minute + .priority = NDLP_NOTICE, + }, + + // terminator + { + .response = NULL, + .length = 0, + .status = RRDPUSH_STATUS_BAD_HANDSHAKE, + .version = STREAM_HANDSHAKE_ERROR_BAD_HANDSHAKE, + .dynamic = false, + .error = "remote node response is not understood, is it Netdata?", + .worker_job_id = WORKER_SENDER_JOB_DISCONNECT_BAD_HANDSHAKE, + .postpone_reconnect_seconds = 1 * 60, // 1 minute + .priority = NDLP_ERR, + } +}; + +static inline bool rrdpush_sender_validate_response(RRDHOST *host, struct sender_state *s, char *http, size_t http_length) { + int32_t version = STREAM_HANDSHAKE_ERROR_BAD_HANDSHAKE; + + int i; + for(i = 0; stream_responses[i].response ; i++) { + if(stream_responses[i].dynamic && + http_length > stream_responses[i].length && http_length < (stream_responses[i].length + 30) && + strncmp(http, stream_responses[i].response, stream_responses[i].length) == 0) { + + version = str2i(&http[stream_responses[i].length]); + break; + } + else if(http_length == stream_responses[i].length && strcmp(http, stream_responses[i].response) == 0) { + version = stream_responses[i].version; + + break; + } + } + + if(version >= STREAM_HANDSHAKE_OK_V1) { + host->destination->reason = version; + host->destination->postpone_reconnection_until = now_realtime_sec() + s->reconnect_delay; + s->capabilities = convert_stream_version_to_capabilities(version, host, true); + return true; + } + + ND_LOG_FIELD_PRIORITY priority = stream_responses[i].priority; + const char *error = stream_responses[i].error; + const char *status = stream_responses[i].status; + int worker_job_id = stream_responses[i].worker_job_id; + int delay = stream_responses[i].postpone_reconnect_seconds; + + worker_is_busy(worker_job_id); + rrdpush_sender_thread_close_socket(host); + host->destination->reason = version; + host->destination->postpone_reconnection_until = now_realtime_sec() + delay; + + ND_LOG_STACK lgs[] = { + ND_LOG_FIELD_TXT(NDF_RESPONSE_CODE, status), + ND_LOG_FIELD_END(), + }; + ND_LOG_STACK_PUSH(lgs); + + char buf[RFC3339_MAX_LENGTH]; + rfc3339_datetime_ut(buf, sizeof(buf), host->destination->postpone_reconnection_until * USEC_PER_SEC, 0, false); + + nd_log(NDLS_DAEMON, priority, + "STREAM %s [send to %s]: %s - will retry in %d secs, at %s", + rrdhost_hostname(host), s->connected_to, error, delay, buf); + + return false; +} + +unsigned char alpn_proto_list[] = { + 18, 'n', 'e', 't', 'd', 'a', 't', 'a', '_', 's', 't', 'r', 'e', 'a', 'm', '/', '2', '.', '0', + 8, 'h', 't', 't', 'p', '/', '1', '.', '1' +}; + +#define CONN_UPGRADE_VAL "upgrade" + +static bool rrdpush_sender_connect_ssl(struct sender_state *s __maybe_unused) { +#ifdef ENABLE_HTTPS + RRDHOST *host = s->host; + bool ssl_required = host->destination && host->destination->ssl; + + netdata_ssl_close(&host->sender->ssl); + + if(!ssl_required) + return true; + + if (netdata_ssl_open_ext(&host->sender->ssl, netdata_ssl_streaming_sender_ctx, s->rrdpush_sender_socket, alpn_proto_list, sizeof(alpn_proto_list))) { + if(!netdata_ssl_connect(&host->sender->ssl)) { + // couldn't connect + + ND_LOG_STACK lgs[] = { + ND_LOG_FIELD_TXT(NDF_RESPONSE_CODE, RRDPUSH_STATUS_SSL_ERROR), + ND_LOG_FIELD_END(), + }; + ND_LOG_STACK_PUSH(lgs); + + worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_SSL_ERROR); + rrdpush_sender_thread_close_socket(host); + host->destination->reason = STREAM_HANDSHAKE_ERROR_SSL_ERROR; + host->destination->postpone_reconnection_until = now_realtime_sec() + 5 * 60; + return false; + } + + if (netdata_ssl_validate_certificate_sender && + security_test_certificate(host->sender->ssl.conn)) { + // certificate is not valid + + ND_LOG_STACK lgs[] = { + ND_LOG_FIELD_TXT(NDF_RESPONSE_CODE, RRDPUSH_STATUS_INVALID_SSL_CERTIFICATE), + ND_LOG_FIELD_END(), + }; + ND_LOG_STACK_PUSH(lgs); + + worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_SSL_ERROR); + netdata_log_error("SSL: closing the stream connection, because the server SSL certificate is not valid."); + rrdpush_sender_thread_close_socket(host); + host->destination->reason = STREAM_HANDSHAKE_ERROR_INVALID_CERTIFICATE; + host->destination->postpone_reconnection_until = now_realtime_sec() + 5 * 60; + return false; + } + + return true; + } + + ND_LOG_STACK lgs[] = { + ND_LOG_FIELD_TXT(NDF_RESPONSE_CODE, RRDPUSH_STATUS_CANT_ESTABLISH_SSL_CONNECTION), + ND_LOG_FIELD_END(), + }; + ND_LOG_STACK_PUSH(lgs); + + netdata_log_error("SSL: failed to establish connection."); + return false; + +#else + // SSL is not enabled + return true; +#endif +} + +static int rrdpush_http_upgrade_prelude(RRDHOST *host, struct sender_state *s) { + + char http[HTTP_HEADER_SIZE + 1]; + snprintfz(http, HTTP_HEADER_SIZE, + "GET " NETDATA_STREAM_URL HTTP_1_1 HTTP_ENDL + "Upgrade: " NETDATA_STREAM_PROTO_NAME HTTP_ENDL + "Connection: Upgrade" + HTTP_HDR_END); + + ssize_t bytes = send_timeout( +#ifdef ENABLE_HTTPS + &host->sender->ssl, +#endif + s->rrdpush_sender_socket, + http, + strlen(http), + 0, + 1000); + + bytes = recv_timeout( +#ifdef ENABLE_HTTPS + &host->sender->ssl, +#endif + s->rrdpush_sender_socket, + http, + HTTP_HEADER_SIZE, + 0, + 1000); + + if (bytes <= 0) { + error_report("Error reading from remote"); + return 1; + } + + rbuf_t buf = rbuf_create(bytes); + rbuf_push(buf, http, bytes); + + http_parse_ctx ctx; + http_parse_ctx_create(&ctx); + ctx.flags |= HTTP_PARSE_FLAG_DONT_WAIT_FOR_CONTENT; + + int rc; +// while((rc = parse_http_response(buf, &ctx)) == HTTP_PARSE_NEED_MORE_DATA); + rc = parse_http_response(buf, &ctx); + + if (rc != HTTP_PARSE_SUCCESS) { + error_report("Failed to parse HTTP response sent. (%d)", rc); + goto err_cleanup; + } + if (ctx.http_code == HTTP_RESP_MOVED_PERM) { + const char *hdr = get_http_header_by_name(&ctx, "location"); + if (hdr) + error_report("HTTP response is %d Moved Permanently (location: \"%s\") instead of expected %d Switching Protocols.", ctx.http_code, hdr, HTTP_RESP_SWITCH_PROTO); + else + error_report("HTTP response is %d instead of expected %d Switching Protocols.", ctx.http_code, HTTP_RESP_SWITCH_PROTO); + goto err_cleanup; + } + if (ctx.http_code == HTTP_RESP_NOT_FOUND) { + error_report("HTTP response is %d instead of expected %d Switching Protocols. Parent version too old.", ctx.http_code, HTTP_RESP_SWITCH_PROTO); + // TODO set some flag here that will signify parent is older version + // and to try connection without rrdpush_http_upgrade_prelude next time + goto err_cleanup; + } + if (ctx.http_code != HTTP_RESP_SWITCH_PROTO) { + error_report("HTTP response is %d instead of expected %d Switching Protocols", ctx.http_code, HTTP_RESP_SWITCH_PROTO); + goto err_cleanup; + } + + const char *hdr = get_http_header_by_name(&ctx, "connection"); + if (!hdr) { + error_report("Missing \"connection\" header in reply"); + goto err_cleanup; + } + if (strncmp(hdr, CONN_UPGRADE_VAL, strlen(CONN_UPGRADE_VAL))) { + error_report("Expected \"connection: " CONN_UPGRADE_VAL "\""); + goto err_cleanup; + } + + hdr = get_http_header_by_name(&ctx, "upgrade"); + if (!hdr) { + error_report("Missing \"upgrade\" header in reply"); + goto err_cleanup; + } + if (strncmp(hdr, NETDATA_STREAM_PROTO_NAME, strlen(NETDATA_STREAM_PROTO_NAME))) { + error_report("Expected \"upgrade: " NETDATA_STREAM_PROTO_NAME "\""); + goto err_cleanup; + } + + netdata_log_debug(D_STREAM, "Stream sender upgrade to \"" NETDATA_STREAM_PROTO_NAME "\" successful"); + rbuf_free(buf); + http_parse_ctx_destroy(&ctx); + return 0; +err_cleanup: + rbuf_free(buf); + http_parse_ctx_destroy(&ctx); + return 1; +} + +static bool 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); + + s->rrdpush_sender_socket = connect_to_one_of_destinations( + host + , default_port + , &tv + , &s->reconnects_counter + , s->connected_to + , sizeof(s->connected_to)-1 + , &host->destination + ); + + if(unlikely(s->rrdpush_sender_socket == -1)) { + // netdata_log_error("STREAM %s [send to %s]: could not connect to parent node at this time.", rrdhost_hostname(host), host->rrdpush_send_destination); + return false; + } + + // netdata_log_info("STREAM %s [send to %s]: initializing communication...", rrdhost_hostname(host), s->connected_to); + + // reset our capabilities to default + s->capabilities = stream_our_capabilities(host, true); + + /* 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); + + host->sender->hops = host->system_info->hops + 1; + + 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" + "&abbrev_timezone=%s" + "&utc_offset=%d" + "&hops=%d" + "&ml_capable=%d" + "&ml_enabled=%d" + "&mc_version=%d" + "&tags=%s" + "&ver=%u" + "&NETDATA_INSTANCE_CLOUD_TYPE=%s" + "&NETDATA_INSTANCE_CLOUD_INSTANCE_TYPE=%s" + "&NETDATA_INSTANCE_CLOUD_INSTANCE_REGION=%s" + "&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 HTTP_ENDL + "User-Agent: %s/%s\r\n" + "Accept: */*\r\n\r\n" + , host->rrdpush_send_api_key + , rrdhost_hostname(host) + , rrdhost_registry_hostname(host) + , host->machine_guid + , default_rrd_update_every + , rrdhost_os(host) + , rrdhost_timezone(host) + , rrdhost_abbrev_timezone(host) + , host->utc_offset + , host->sender->hops + , host->system_info->ml_capable + , host->system_info->ml_enabled + , host->system_info->mc_version + , rrdhost_tags(host) + , s->capabilities + , (host->system_info->cloud_provider_type) ? host->system_info->cloud_provider_type : "" + , (host->system_info->cloud_instance_type) ? host->system_info->cloud_instance_type : "" + , (host->system_info->cloud_instance_region) ? host->system_info->cloud_instance_region : "" + , 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 + , rrdhost_program_name(host) + , rrdhost_program_version(host) + ); + http[eol] = 0x00; + rrdpush_clean_encoded(&se); + + if(!rrdpush_sender_connect_ssl(s)) + return false; + + if (s->parent_using_h2o && rrdpush_http_upgrade_prelude(host, s)) { + ND_LOG_STACK lgs[] = { + ND_LOG_FIELD_TXT(NDF_RESPONSE_CODE, RRDPUSH_STATUS_CANT_UPGRADE_CONNECTION), + ND_LOG_FIELD_END(), + }; + ND_LOG_STACK_PUSH(lgs); + + worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_CANT_UPGRADE_CONNECTION); + rrdpush_sender_thread_close_socket(host); + host->destination->reason = STREAM_HANDSHAKE_ERROR_HTTP_UPGRADE; + host->destination->postpone_reconnection_until = now_realtime_sec() + 1 * 60; + return false; + } + + ssize_t bytes, len = (ssize_t)strlen(http); + + bytes = send_timeout( +#ifdef ENABLE_HTTPS + &host->sender->ssl, +#endif + s->rrdpush_sender_socket, + http, + len, + 0, + timeout); + + if(bytes <= 0) { // timeout is 0 + ND_LOG_STACK lgs[] = { + ND_LOG_FIELD_TXT(NDF_RESPONSE_CODE, RRDPUSH_STATUS_TIMEOUT), + ND_LOG_FIELD_END(), + }; + ND_LOG_STACK_PUSH(lgs); + + worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_TIMEOUT); + rrdpush_sender_thread_close_socket(host); + + nd_log(NDLS_DAEMON, NDLP_ERR, + "STREAM %s [send to %s]: failed to send HTTP header to remote netdata.", + rrdhost_hostname(host), s->connected_to); + + host->destination->reason = STREAM_HANDSHAKE_ERROR_SEND_TIMEOUT; + host->destination->postpone_reconnection_until = now_realtime_sec() + 1 * 60; + return false; + } + + bytes = recv_timeout( +#ifdef ENABLE_HTTPS + &host->sender->ssl, +#endif + s->rrdpush_sender_socket, + http, + HTTP_HEADER_SIZE, + 0, + timeout); + + if(bytes <= 0) { // timeout is 0 + ND_LOG_STACK lgs[] = { + ND_LOG_FIELD_TXT(NDF_RESPONSE_CODE, RRDPUSH_STATUS_TIMEOUT), + ND_LOG_FIELD_END(), + }; + ND_LOG_STACK_PUSH(lgs); + + worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_TIMEOUT); + rrdpush_sender_thread_close_socket(host); + + nd_log(NDLS_DAEMON, NDLP_ERR, + "STREAM %s [send to %s]: remote netdata does not respond.", + rrdhost_hostname(host), s->connected_to); + + host->destination->reason = STREAM_HANDSHAKE_ERROR_RECEIVE_TIMEOUT; + host->destination->postpone_reconnection_until = now_realtime_sec() + 30; + return false; + } + + if(sock_setnonblock(s->rrdpush_sender_socket) < 0) + nd_log(NDLS_DAEMON, NDLP_WARNING, + "STREAM %s [send to %s]: cannot set non-blocking mode for socket.", + rrdhost_hostname(host), s->connected_to); + + if(sock_enlarge_out(s->rrdpush_sender_socket) < 0) + nd_log(NDLS_DAEMON, NDLP_WARNING, + "STREAM %s [send to %s]: cannot enlarge the socket buffer.", + rrdhost_hostname(host), s->connected_to); + + http[bytes] = '\0'; + if(!rrdpush_sender_validate_response(host, s, http, bytes)) + return false; + + rrdpush_compression_initialize(s); + + log_sender_capabilities(s); + + ND_LOG_STACK lgs[] = { + ND_LOG_FIELD_TXT(NDF_RESPONSE_CODE, RRDPUSH_STATUS_CONNECTED), + ND_LOG_FIELD_END(), + }; + ND_LOG_STACK_PUSH(lgs); + + nd_log(NDLS_DAEMON, NDLP_DEBUG, + "STREAM %s: connected to %s...", + rrdhost_hostname(host), s->connected_to); + + return true; +} + +static bool attempt_to_connect(struct sender_state *state) { + ND_LOG_STACK lgs[] = { + ND_LOG_FIELD_UUID(NDF_MESSAGE_ID, &streaming_to_parent_msgid), + ND_LOG_FIELD_END(), + }; + ND_LOG_STACK_PUSH(lgs); + + state->send_attempts = 0; + + // reset the bytes we have sent for this session + state->sent_bytes_on_this_connection = 0; + memset(state->sent_bytes_on_this_connection_per_type, 0, sizeof(state->sent_bytes_on_this_connection_per_type)); + + if(rrdpush_sender_thread_connect_to_parent(state->host, state->default_port, state->timeout, state)) { + // reset the buffer, to properly send charts and metrics + rrdpush_sender_on_connect(state->host); + + // send from the beginning + state->begin = 0; + + // make sure the next reconnection will be immediate + state->not_connected_loops = 0; + + // let the data collection threads know we are ready + rrdhost_flag_set(state->host, RRDHOST_FLAG_RRDPUSH_SENDER_CONNECTED); + + rrdpush_sender_after_connect(state->host); + + return true; + } + + // we couldn't connect + + // increase the failed connections counter + state->not_connected_loops++; + + // slow re-connection on repeating errors + usec_t now_ut = now_monotonic_usec(); + usec_t end_ut = now_ut + USEC_PER_SEC * state->reconnect_delay; + while(now_ut < end_ut) { + netdata_thread_testcancel(); + sleep_usec(500 * USEC_PER_MS); // seconds + now_ut = now_monotonic_usec(); + } + + return false; +} + +// TCP window is open, and we have data to transmit. +static ssize_t attempt_to_send(struct sender_state *s) { + ssize_t ret; + +#ifdef NETDATA_INTERNAL_CHECKS + struct circular_buffer *cb = s->buffer; +#endif + + sender_lock(s); + char *chunk; + size_t outstanding = cbuffer_next_unsafe(s->buffer, &chunk); + netdata_log_debug(D_STREAM, "STREAM: Sending data. Buffer r=%zu w=%zu s=%zu, next chunk=%zu", cb->read, cb->write, cb->size, outstanding); + +#ifdef ENABLE_HTTPS + if(SSL_connection(&s->ssl)) + ret = netdata_ssl_write(&s->ssl, chunk, outstanding); + else + ret = send(s->rrdpush_sender_socket, chunk, outstanding, MSG_DONTWAIT); +#else + ret = send(s->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; + netdata_log_debug(D_STREAM, "STREAM %s [send to %s]: Sent %zd bytes", rrdhost_hostname(s->host), s->connected_to, ret); + } + else if (ret == -1 && (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) + netdata_log_debug(D_STREAM, "STREAM %s [send to %s]: unavailable after polling POLLOUT", rrdhost_hostname(s->host), s->connected_to); + else if (ret == -1) { + worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_SEND_ERROR); + netdata_log_debug(D_STREAM, "STREAM: Send failed - closing socket..."); + netdata_log_error("STREAM %s [send to %s]: failed to send metrics - closing connection - we have sent %zu bytes on this connection.", rrdhost_hostname(s->host), s->connected_to, s->sent_bytes_on_this_connection); + rrdpush_sender_thread_close_socket(s->host); + } + else + netdata_log_debug(D_STREAM, "STREAM: send() returned 0 -> no error but no transmission"); + + replication_recalculate_buffer_used_ratio_unsafe(s); + sender_unlock(s); + + return ret; +} + +static ssize_t attempt_read(struct sender_state *s) { + ssize_t ret; + +#ifdef ENABLE_HTTPS + if (SSL_connection(&s->ssl)) + ret = netdata_ssl_read(&s->ssl, s->read_buffer + s->read_len, sizeof(s->read_buffer) - s->read_len - 1); + else + ret = recv(s->rrdpush_sender_socket, s->read_buffer + s->read_len, sizeof(s->read_buffer) - s->read_len - 1,MSG_DONTWAIT); +#else + ret = recv(s->rrdpush_sender_socket, s->read_buffer + s->read_len, sizeof(s->read_buffer) - s->read_len - 1,MSG_DONTWAIT); +#endif + + if (ret > 0) { + s->read_len += ret; + return ret; + } + + if (ret < 0 && (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)) + return ret; + +#ifdef ENABLE_HTTPS + if (SSL_connection(&s->ssl)) + worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_SSL_ERROR); + else +#endif + + if (ret == 0 || errno == ECONNRESET) { + worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_PARENT_CLOSED); + netdata_log_error("STREAM %s [send to %s]: connection closed by far end.", rrdhost_hostname(s->host), s->connected_to); + } + else { + worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_RECEIVE_ERROR); + netdata_log_error("STREAM %s [send to %s]: error during receive (%zd) - closing connection.", rrdhost_hostname(s->host), s->connected_to, ret); + } + + rrdpush_sender_thread_close_socket(s->host); + + return ret; +} + +struct inflight_stream_function { + struct sender_state *sender; + STRING *transaction; + usec_t received_ut; +}; + +void stream_execute_function_callback(BUFFER *func_wb, int code, void *data) { + struct inflight_stream_function *tmp = data; + + struct sender_state *s = tmp->sender; + + if(rrdhost_can_send_definitions_to_parent(s->host)) { + BUFFER *wb = sender_start(s); + + pluginsd_function_result_begin_to_buffer(wb + , string2str(tmp->transaction) + , code + , functions_content_type_to_format(func_wb->content_type) + , func_wb->expires); + + buffer_fast_strcat(wb, buffer_tostring(func_wb), buffer_strlen(func_wb)); + pluginsd_function_result_end_to_buffer(wb); + + sender_commit(s, wb, STREAM_TRAFFIC_TYPE_FUNCTIONS); + sender_thread_buffer_free(); + + internal_error(true, "STREAM %s [send to %s] FUNCTION transaction %s sending back response (%zu bytes, %"PRIu64" usec).", + rrdhost_hostname(s->host), s->connected_to, + string2str(tmp->transaction), + buffer_strlen(func_wb), + now_realtime_usec() - tmp->received_ut); + } + + string_freez(tmp->transaction); + buffer_free(func_wb); + freez(tmp); +} + +// This is just a placeholder until the gap filling state machine is inserted +void execute_commands(struct sender_state *s) { + worker_is_busy(WORKER_SENDER_JOB_EXECUTE); + + ND_LOG_STACK lgs[] = { + ND_LOG_FIELD_CB(NDF_REQUEST, line_splitter_reconstruct_line, &s->line), + ND_LOG_FIELD_END(), + }; + ND_LOG_STACK_PUSH(lgs); + + char *start = s->read_buffer, *end = &s->read_buffer[s->read_len], *newline; + *end = 0; + while( start < end && (newline = strchr(start, '\n')) ) { + *newline = '\0'; + + if (s->receiving_function_payload && unlikely(strcmp(start, PLUGINSD_KEYWORD_FUNCTION_PAYLOAD_END) != 0)) { + if (buffer_strlen(s->function_payload.payload) != 0) + buffer_strcat(s->function_payload.payload, "\n"); + buffer_strcat(s->function_payload.payload, start); + start = newline + 1; + continue; + } + + s->line.count++; + s->line.num_words = quoted_strings_splitter_pluginsd(start, s->line.words, PLUGINSD_MAX_WORDS); + const char *command = get_word(s->line.words, s->line.num_words, 0); + + if(command && (strcmp(command, PLUGINSD_KEYWORD_FUNCTION) == 0 || strcmp(command, PLUGINSD_KEYWORD_FUNCTION_PAYLOAD_END) == 0)) { + worker_is_busy(WORKER_SENDER_JOB_FUNCTION_REQUEST); + nd_log(NDLS_ACCESS, NDLP_INFO, NULL); + + char *transaction = s->receiving_function_payload ? s->function_payload.txid : get_word(s->line.words, s->line.num_words, 1); + char *timeout_s = s->receiving_function_payload ? s->function_payload.timeout : get_word(s->line.words, s->line.num_words, 2); + char *function = s->receiving_function_payload ? s->function_payload.fn_name : get_word(s->line.words, s->line.num_words, 3); + + if(!transaction || !*transaction || !timeout_s || !*timeout_s || !function || !*function) { + netdata_log_error("STREAM %s [send to %s] %s execution command is incomplete (transaction = '%s', timeout = '%s', function = '%s'). Ignoring it.", + rrdhost_hostname(s->host), s->connected_to, + command, + transaction?transaction:"(unset)", + timeout_s?timeout_s:"(unset)", + function?function:"(unset)"); + } + else { + int timeout = str2i(timeout_s); + if(timeout <= 0) timeout = PLUGINS_FUNCTIONS_TIMEOUT_DEFAULT; + + struct inflight_stream_function *tmp = callocz(1, sizeof(struct inflight_stream_function)); + tmp->received_ut = now_realtime_usec(); + tmp->sender = s; + tmp->transaction = string_strdupz(transaction); + BUFFER *wb = buffer_create(PLUGINSD_LINE_MAX + 1, &netdata_buffers_statistics.buffers_functions); + + char *payload = s->receiving_function_payload ? (char *)buffer_tostring(s->function_payload.payload) : NULL; + int code = rrd_function_run(s->host, wb, timeout, function, false, transaction, + stream_execute_function_callback, tmp, NULL, NULL, payload); + + if(code != HTTP_RESP_OK) { + if (!buffer_strlen(wb)) + rrd_call_function_error(wb, "Failed to route request to collector", code); + + stream_execute_function_callback(wb, code, tmp); + } + } + + if (s->receiving_function_payload) { + s->receiving_function_payload = false; + + buffer_free(s->function_payload.payload); + freez(s->function_payload.txid); + freez(s->function_payload.timeout); + freez(s->function_payload.fn_name); + + memset(&s->function_payload, 0, sizeof(struct function_payload_state)); + } + } + else if (command && strcmp(command, PLUGINSD_KEYWORD_FUNCTION_PAYLOAD) == 0) { + nd_log(NDLS_ACCESS, NDLP_INFO, NULL); + + if (s->receiving_function_payload) { + netdata_log_error("STREAM %s [send to %s] received %s command while already receiving function payload", + rrdhost_hostname(s->host), s->connected_to, command); + s->receiving_function_payload = false; + buffer_free(s->function_payload.payload); + s->function_payload.payload = NULL; + + // TODO send error response + } + + char *transaction = get_word(s->line.words, s->line.num_words, 1); + char *timeout_s = get_word(s->line.words, s->line.num_words, 2); + char *function = get_word(s->line.words, s->line.num_words, 3); + + if(!transaction || !*transaction || !timeout_s || !*timeout_s || !function || !*function) { + netdata_log_error("STREAM %s [send to %s] %s execution command is incomplete (transaction = '%s', timeout = '%s', function = '%s'). Ignoring it.", + rrdhost_hostname(s->host), s->connected_to, + command, + transaction?transaction:"(unset)", + timeout_s?timeout_s:"(unset)", + function?function:"(unset)"); + } + + s->receiving_function_payload = true; + s->function_payload.payload = buffer_create(4096, &netdata_buffers_statistics.buffers_functions); + + s->function_payload.txid = strdupz(get_word(s->line.words, s->line.num_words, 1)); + s->function_payload.timeout = strdupz(get_word(s->line.words, s->line.num_words, 2)); + s->function_payload.fn_name = strdupz(get_word(s->line.words, s->line.num_words, 3)); + } + else if(command && strcmp(command, PLUGINSD_KEYWORD_FUNCTION_CANCEL) == 0) { + worker_is_busy(WORKER_SENDER_JOB_FUNCTION_REQUEST); + nd_log(NDLS_ACCESS, NDLP_DEBUG, NULL); + + char *transaction = get_word(s->line.words, s->line.num_words, 1); + if(transaction && *transaction) + rrd_function_cancel(transaction); + } + else if (command && strcmp(command, PLUGINSD_KEYWORD_REPLAY_CHART) == 0) { + worker_is_busy(WORKER_SENDER_JOB_REPLAY_REQUEST); + nd_log(NDLS_ACCESS, NDLP_DEBUG, NULL); + + const char *chart_id = get_word(s->line.words, s->line.num_words, 1); + const char *start_streaming = get_word(s->line.words, s->line.num_words, 2); + const char *after = get_word(s->line.words, s->line.num_words, 3); + const char *before = get_word(s->line.words, s->line.num_words, 4); + + if (!chart_id || !start_streaming || !after || !before) { + netdata_log_error("STREAM %s [send to %s] %s command is incomplete" + " (chart=%s, start_streaming=%s, after=%s, before=%s)", + rrdhost_hostname(s->host), s->connected_to, + command, + chart_id ? chart_id : "(unset)", + start_streaming ? start_streaming : "(unset)", + after ? after : "(unset)", + before ? before : "(unset)"); + } + else { + replication_add_request(s, chart_id, + strtoll(after, NULL, 0), + strtoll(before, NULL, 0), + !strcmp(start_streaming, "true") + ); + } + } + else { + netdata_log_error("STREAM %s [send to %s] received unknown command over connection: %s", rrdhost_hostname(s->host), s->connected_to, s->line.words[0]?s->line.words[0]:"(unset)"); + } + + line_splitter_reset(&s->line); + worker_is_busy(WORKER_SENDER_JOB_EXECUTE); + start = newline + 1; + } + + if (start < end) { + memmove(s->read_buffer, start, end-start); + s->read_len = end - start; + } + else { + s->read_buffer[0] = '\0'; + s->read_len = 0; + } +} + +struct rrdpush_sender_thread_data { + RRDHOST *host; + char *pipe_buffer; +}; + +static bool rrdpush_sender_pipe_close(RRDHOST *host, int *pipe_fds, bool reopen) { + static netdata_mutex_t mutex = NETDATA_MUTEX_INITIALIZER; + + bool ret = true; + + netdata_mutex_lock(&mutex); + + int new_pipe_fds[2]; + if(reopen) { + if(pipe(new_pipe_fds) != 0) { + netdata_log_error("STREAM %s [send]: cannot create required pipe.", rrdhost_hostname(host)); + new_pipe_fds[PIPE_READ] = -1; + new_pipe_fds[PIPE_WRITE] = -1; + ret = false; + } + } + + int old_pipe_fds[2]; + old_pipe_fds[PIPE_READ] = pipe_fds[PIPE_READ]; + old_pipe_fds[PIPE_WRITE] = pipe_fds[PIPE_WRITE]; + + if(reopen) { + pipe_fds[PIPE_READ] = new_pipe_fds[PIPE_READ]; + pipe_fds[PIPE_WRITE] = new_pipe_fds[PIPE_WRITE]; + } + else { + pipe_fds[PIPE_READ] = -1; + pipe_fds[PIPE_WRITE] = -1; + } + + if(old_pipe_fds[PIPE_READ] > 2) + close(old_pipe_fds[PIPE_READ]); + + if(old_pipe_fds[PIPE_WRITE] > 2) + close(old_pipe_fds[PIPE_WRITE]); + + netdata_mutex_unlock(&mutex); + return ret; +} + +void rrdpush_signal_sender_to_wake_up(struct sender_state *s) { + if(unlikely(s->tid == gettid())) + return; + + RRDHOST *host = s->host; + + int pipe_fd = s->rrdpush_sender_pipe[PIPE_WRITE]; + + // signal the sender there are more data + if (pipe_fd != -1 && write(pipe_fd, " ", 1) == -1) { + netdata_log_error("STREAM %s [send]: cannot write to internal pipe.", rrdhost_hostname(host)); + rrdpush_sender_pipe_close(host, s->rrdpush_sender_pipe, true); + } +} + +static bool rrdhost_set_sender(RRDHOST *host) { + if(unlikely(!host->sender)) return false; + + bool ret = false; + sender_lock(host->sender); + if(!host->sender->tid) { + rrdhost_flag_clear(host, RRDHOST_FLAG_RRDPUSH_SENDER_CONNECTED | RRDHOST_FLAG_RRDPUSH_SENDER_READY_4_METRICS); + rrdhost_flag_set(host, RRDHOST_FLAG_RRDPUSH_SENDER_SPAWN); + host->rrdpush_sender_connection_counter++; + host->sender->tid = gettid(); + host->sender->last_state_since_t = now_realtime_sec(); + host->sender->exit.reason = STREAM_HANDSHAKE_NEVER; + ret = true; + } + sender_unlock(host->sender); + + rrdpush_reset_destinations_postpone_time(host); + + return ret; +} + +static void rrdhost_clear_sender___while_having_sender_mutex(RRDHOST *host) { + if(unlikely(!host->sender)) return; + + if(host->sender->tid == gettid()) { + host->sender->tid = 0; + host->sender->exit.shutdown = false; + rrdhost_flag_clear(host, RRDHOST_FLAG_RRDPUSH_SENDER_SPAWN | RRDHOST_FLAG_RRDPUSH_SENDER_CONNECTED | RRDHOST_FLAG_RRDPUSH_SENDER_READY_4_METRICS); + host->sender->last_state_since_t = now_realtime_sec(); + if(host->destination) { + host->destination->since = host->sender->last_state_since_t; + host->destination->reason = host->sender->exit.reason; + } + } + + rrdpush_reset_destinations_postpone_time(host); +} + +static bool rrdhost_sender_should_exit(struct sender_state *s) { + // check for outstanding cancellation requests + netdata_thread_testcancel(); + + if(unlikely(!service_running(SERVICE_STREAMING))) { + if(!s->exit.reason) + s->exit.reason = STREAM_HANDSHAKE_DISCONNECT_NETDATA_EXIT; + return true; + } + + if(unlikely(!rrdhost_has_rrdpush_sender_enabled(s->host))) { + if(!s->exit.reason) + s->exit.reason = STREAM_HANDSHAKE_NON_STREAMABLE_HOST; + return true; + } + + if(unlikely(s->exit.shutdown)) { + if(!s->exit.reason) + s->exit.reason = STREAM_HANDSHAKE_DISCONNECT_SHUTDOWN; + return true; + } + + if(unlikely(rrdhost_flag_check(s->host, RRDHOST_FLAG_ORPHAN))) { + if(!s->exit.reason) + s->exit.reason = STREAM_HANDSHAKE_DISCONNECT_ORPHAN_HOST; + return true; + } + + return false; +} + +static void rrdpush_sender_thread_cleanup_callback(void *ptr) { + struct rrdpush_sender_thread_data *s = ptr; + worker_unregister(); + + RRDHOST *host = s->host; + + sender_lock(host->sender); + netdata_log_info("STREAM %s [send]: sending thread exits %s", + rrdhost_hostname(host), + host->sender->exit.reason != STREAM_HANDSHAKE_NEVER ? stream_handshake_error_to_string(host->sender->exit.reason) : ""); + + rrdpush_sender_thread_close_socket(host); + rrdpush_sender_pipe_close(host, host->sender->rrdpush_sender_pipe, false); + + rrdhost_clear_sender___while_having_sender_mutex(host); + +#ifdef NETDATA_LOG_STREAM_SENDER + if(host->sender->stream_log_fp) { + fclose(host->sender->stream_log_fp); + host->sender->stream_log_fp = NULL; + } +#endif + + sender_unlock(host->sender); + + freez(s->pipe_buffer); + freez(s); +} + +void rrdpush_initialize_ssl_ctx(RRDHOST *host __maybe_unused) { +#ifdef ENABLE_HTTPS + static SPINLOCK sp = NETDATA_SPINLOCK_INITIALIZER; + spinlock_lock(&sp); + + if(netdata_ssl_streaming_sender_ctx || !host) { + spinlock_unlock(&sp); + return; + } + + for(struct rrdpush_destinations *d = host->destinations; d ; d = d->next) { + if (d->ssl) { + // we need to initialize SSL + + netdata_ssl_initialize_ctx(NETDATA_SSL_STREAMING_SENDER_CTX); + ssl_security_location_for_context(netdata_ssl_streaming_sender_ctx, netdata_ssl_ca_file, netdata_ssl_ca_path); + + // stop the loop + break; + } + } + + spinlock_unlock(&sp); +#endif +} + +static bool stream_sender_log_capabilities(BUFFER *wb, void *ptr) { + struct sender_state *state = ptr; + if(!state) + return false; + + stream_capabilities_to_string(wb, state->capabilities); + return true; +} + +static bool stream_sender_log_transport(BUFFER *wb, void *ptr) { + struct sender_state *state = ptr; + if(!state) + return false; + +#ifdef ENABLE_HTTPS + buffer_strcat(wb, SSL_connection(&state->ssl) ? "https" : "http"); +#else + buffer_strcat(wb, "http"); +#endif + return true; +} + +static bool stream_sender_log_dst_ip(BUFFER *wb, void *ptr) { + struct sender_state *state = ptr; + if(!state || state->rrdpush_sender_socket == -1) + return false; + + SOCKET_PEERS peers = socket_peers(state->rrdpush_sender_socket); + buffer_strcat(wb, peers.peer.ip); + return true; +} + +static bool stream_sender_log_dst_port(BUFFER *wb, void *ptr) { + struct sender_state *state = ptr; + if(!state || state->rrdpush_sender_socket == -1) + return false; + + SOCKET_PEERS peers = socket_peers(state->rrdpush_sender_socket); + buffer_print_uint64(wb, peers.peer.port); + return true; +} + +void *rrdpush_sender_thread(void *ptr) { + struct sender_state *s = ptr; + + ND_LOG_STACK lgs[] = { + ND_LOG_FIELD_STR(NDF_NIDL_NODE, s->host->hostname), + ND_LOG_FIELD_CB(NDF_DST_IP, stream_sender_log_dst_ip, s), + ND_LOG_FIELD_CB(NDF_DST_PORT, stream_sender_log_dst_port, s), + ND_LOG_FIELD_CB(NDF_DST_TRANSPORT, stream_sender_log_transport, s), + ND_LOG_FIELD_CB(NDF_SRC_CAPABILITIES, stream_sender_log_capabilities, s), + ND_LOG_FIELD_END(), + }; + ND_LOG_STACK_PUSH(lgs); + + worker_register("STREAMSND"); + worker_register_job_name(WORKER_SENDER_JOB_CONNECT, "connect"); + worker_register_job_name(WORKER_SENDER_JOB_PIPE_READ, "pipe read"); + worker_register_job_name(WORKER_SENDER_JOB_SOCKET_RECEIVE, "receive"); + worker_register_job_name(WORKER_SENDER_JOB_EXECUTE, "execute"); + worker_register_job_name(WORKER_SENDER_JOB_SOCKET_SEND, "send"); + + // disconnection reasons + worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_TIMEOUT, "disconnect timeout"); + worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_POLL_ERROR, "disconnect poll error"); + worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_SOCKET_ERROR, "disconnect socket error"); + worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_OVERFLOW, "disconnect overflow"); + worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_SSL_ERROR, "disconnect ssl error"); + worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_PARENT_CLOSED, "disconnect parent closed"); + worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_RECEIVE_ERROR, "disconnect receive error"); + worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_SEND_ERROR, "disconnect send error"); + worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_NO_COMPRESSION, "disconnect no compression"); + worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_BAD_HANDSHAKE, "disconnect bad handshake"); + worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_CANT_UPGRADE_CONNECTION, "disconnect cant upgrade"); + + worker_register_job_name(WORKER_SENDER_JOB_REPLAY_REQUEST, "replay request"); + worker_register_job_name(WORKER_SENDER_JOB_FUNCTION_REQUEST, "function"); + + worker_register_job_custom_metric(WORKER_SENDER_JOB_BUFFER_RATIO, "used buffer ratio", "%", WORKER_METRIC_ABSOLUTE); + worker_register_job_custom_metric(WORKER_SENDER_JOB_BYTES_RECEIVED, "bytes received", "bytes/s", WORKER_METRIC_INCREMENT); + worker_register_job_custom_metric(WORKER_SENDER_JOB_BYTES_SENT, "bytes sent", "bytes/s", WORKER_METRIC_INCREMENT); + worker_register_job_custom_metric(WORKER_SENDER_JOB_BYTES_COMPRESSED, "bytes compressed", "bytes/s", WORKER_METRIC_INCREMENTAL_TOTAL); + worker_register_job_custom_metric(WORKER_SENDER_JOB_BYTES_UNCOMPRESSED, "bytes uncompressed", "bytes/s", WORKER_METRIC_INCREMENTAL_TOTAL); + worker_register_job_custom_metric(WORKER_SENDER_JOB_BYTES_COMPRESSION_RATIO, "cumulative compression savings ratio", "%", WORKER_METRIC_ABSOLUTE); + worker_register_job_custom_metric(WORKER_SENDER_JOB_REPLAY_DICT_SIZE, "replication dict entries", "entries", WORKER_METRIC_ABSOLUTE); + + if(!rrdhost_has_rrdpush_sender_enabled(s->host) || !s->host->rrdpush_send_destination || + !*s->host->rrdpush_send_destination || !s->host->rrdpush_send_api_key || + !*s->host->rrdpush_send_api_key) { + netdata_log_error("STREAM %s [send]: thread created (task id %d), but host has streaming disabled.", + rrdhost_hostname(s->host), gettid()); + return NULL; + } + + if(!rrdhost_set_sender(s->host)) { + netdata_log_error("STREAM %s [send]: thread created (task id %d), but there is another sender running for this host.", + rrdhost_hostname(s->host), gettid()); + return NULL; + } + + rrdpush_initialize_ssl_ctx(s->host); + + netdata_log_info("STREAM %s [send]: thread created (task id %d)", rrdhost_hostname(s->host), gettid()); + + s->timeout = (int)appconfig_get_number( + &stream_config, CONFIG_SECTION_STREAM, "timeout seconds", 600); + + 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 * 10); + + 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 + + s->parent_using_h2o = appconfig_get_boolean( + &stream_config, CONFIG_SECTION_STREAM, "parent using h2o", false); + + // initialize rrdpush globals + rrdhost_flag_clear(s->host, RRDHOST_FLAG_RRDPUSH_SENDER_READY_4_METRICS); + rrdhost_flag_clear(s->host, RRDHOST_FLAG_RRDPUSH_SENDER_CONNECTED); + + int pipe_buffer_size = 10 * 1024; +#ifdef F_GETPIPE_SZ + pipe_buffer_size = fcntl(s->rrdpush_sender_pipe[PIPE_READ], F_GETPIPE_SZ); +#endif + if(pipe_buffer_size < 10 * 1024) + pipe_buffer_size = 10 * 1024; + + if(!rrdpush_sender_pipe_close(s->host, s->rrdpush_sender_pipe, true)) { + netdata_log_error("STREAM %s [send]: cannot create inter-thread communication pipe. Disabling streaming.", + rrdhost_hostname(s->host)); + return NULL; + } + + struct rrdpush_sender_thread_data *thread_data = callocz(1, sizeof(struct rrdpush_sender_thread_data)); + thread_data->pipe_buffer = mallocz(pipe_buffer_size); + thread_data->host = s->host; + + netdata_thread_cleanup_push(rrdpush_sender_thread_cleanup_callback, thread_data); + + size_t iterations = 0; + time_t now_s = now_monotonic_sec(); + while(!rrdhost_sender_should_exit(s)) { + iterations++; + + // The connection attempt blocks (after which we use the socket in nonblocking) + if(unlikely(s->rrdpush_sender_socket == -1)) { + worker_is_busy(WORKER_SENDER_JOB_CONNECT); + + now_s = now_monotonic_sec(); + rrdpush_sender_cbuffer_recreate_timed(s, now_s, false, true); + + rrdhost_flag_clear(s->host, RRDHOST_FLAG_RRDPUSH_SENDER_READY_4_METRICS); + s->flags &= ~SENDER_FLAG_OVERFLOW; + s->read_len = 0; + s->buffer->read = 0; + s->buffer->write = 0; + + if(!attempt_to_connect(s)) + continue; + + if(rrdhost_sender_should_exit(s)) + break; + + now_s = s->last_traffic_seen_t = now_monotonic_sec(); + rrdpush_send_claimed_id(s->host); + rrdpush_send_host_labels(s->host); + rrdpush_send_global_functions(s->host); + rrdpush_send_dyncfg(s->host); + s->replication.oldest_request_after_t = 0; + + rrdhost_flag_set(s->host, RRDHOST_FLAG_RRDPUSH_SENDER_READY_4_METRICS); + + nd_log(NDLS_DAEMON, NDLP_DEBUG, + "STREAM %s [send to %s]: enabling metrics streaming...", + rrdhost_hostname(s->host), s->connected_to); + + continue; + } + + if(iterations % 1000 == 0) + now_s = now_monotonic_sec(); + + // If the TCP window never opened then something is wrong, restart connection + if(unlikely(now_s - s->last_traffic_seen_t > s->timeout && + !rrdpush_sender_pending_replication_requests(s) && + !rrdpush_sender_replicating_charts(s) + )) { + worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_TIMEOUT); + netdata_log_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.", rrdhost_hostname(s->host), s->connected_to, s->timeout, s->sent_bytes_on_this_connection, s->send_attempts); + rrdpush_sender_thread_close_socket(s->host); + continue; + } + + sender_lock(s); + size_t outstanding = cbuffer_next_unsafe(s->buffer, NULL); + size_t available = cbuffer_available_size_unsafe(s->buffer); + if (unlikely(!outstanding)) { + rrdpush_sender_pipe_clear_pending_data(s); + rrdpush_sender_cbuffer_recreate_timed(s, now_s, true, false); + } + + if(s->compressor.initialized) { + size_t bytes_uncompressed = s->compressor.sender_locked.total_uncompressed; + size_t bytes_compressed = s->compressor.sender_locked.total_compressed + s->compressor.sender_locked.total_compressions * sizeof(rrdpush_signature_t); + NETDATA_DOUBLE ratio = 100.0 - ((NETDATA_DOUBLE)bytes_compressed * 100.0 / (NETDATA_DOUBLE)bytes_uncompressed); + worker_set_metric(WORKER_SENDER_JOB_BYTES_UNCOMPRESSED, (NETDATA_DOUBLE)bytes_uncompressed); + worker_set_metric(WORKER_SENDER_JOB_BYTES_COMPRESSED, (NETDATA_DOUBLE)bytes_compressed); + worker_set_metric(WORKER_SENDER_JOB_BYTES_COMPRESSION_RATIO, ratio); + } + sender_unlock(s); + + worker_set_metric(WORKER_SENDER_JOB_BUFFER_RATIO, (NETDATA_DOUBLE)(s->buffer->max_size - available) * 100.0 / (NETDATA_DOUBLE)s->buffer->max_size); + + if(outstanding) + s->send_attempts++; + + if(unlikely(s->rrdpush_sender_pipe[PIPE_READ] == -1)) { + if(!rrdpush_sender_pipe_close(s->host, s->rrdpush_sender_pipe, true)) { + netdata_log_error("STREAM %s [send]: cannot create inter-thread communication pipe. Disabling streaming.", + rrdhost_hostname(s->host)); + rrdpush_sender_thread_close_socket(s->host); + break; + } + } + + worker_is_idle(); + + // Wait until buffer opens in the socket or a rrdset_done_push wakes us + enum { + Collector = 0, + Socket = 1, + }; + struct pollfd fds[2] = { + [Collector] = { + .fd = s->rrdpush_sender_pipe[PIPE_READ], + .events = POLLIN, + .revents = 0, + }, + [Socket] = { + .fd = s->rrdpush_sender_socket, + .events = POLLIN | (outstanding ? POLLOUT : 0 ), + .revents = 0, + } + }; + + int poll_rc = poll(fds, 2, 50); // timeout in milliseconds + + netdata_log_debug(D_STREAM, "STREAM: poll() finished collector=%d socket=%d (current chunk %zu bytes)...", + fds[Collector].revents, fds[Socket].revents, outstanding); + + if(unlikely(rrdhost_sender_should_exit(s))) + break; + + internal_error(fds[Collector].fd != s->rrdpush_sender_pipe[PIPE_READ], + "STREAM %s [send to %s]: pipe changed after poll().", rrdhost_hostname(s->host), s->connected_to); + + internal_error(fds[Socket].fd != s->rrdpush_sender_socket, + "STREAM %s [send to %s]: socket changed after poll().", rrdhost_hostname(s->host), s->connected_to); + + // Spurious wake-ups without error - loop again + if (poll_rc == 0 || ((poll_rc == -1) && (errno == EAGAIN || errno == EINTR))) { + netdata_thread_testcancel(); + netdata_log_debug(D_STREAM, "Spurious wakeup"); + now_s = now_monotonic_sec(); + continue; + } + + // Only errors from poll() are internal, but try restarting the connection + if(unlikely(poll_rc == -1)) { + worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_POLL_ERROR); + netdata_log_error("STREAM %s [send to %s]: failed to poll(). Closing socket.", rrdhost_hostname(s->host), s->connected_to); + rrdpush_sender_pipe_close(s->host, s->rrdpush_sender_pipe, true); + rrdpush_sender_thread_close_socket(s->host); + continue; + } + + // If we have data and have seen the TCP window open then try to close it by a transmission. + if(likely(outstanding && (fds[Socket].revents & POLLOUT))) { + worker_is_busy(WORKER_SENDER_JOB_SOCKET_SEND); + ssize_t bytes = attempt_to_send(s); + if(bytes > 0) { + s->last_traffic_seen_t = now_monotonic_sec(); + worker_set_metric(WORKER_SENDER_JOB_BYTES_SENT, (NETDATA_DOUBLE)bytes); + } + } + + // If the collector woke us up then empty the pipe to remove the signal + if (fds[Collector].revents & (POLLIN|POLLPRI)) { + worker_is_busy(WORKER_SENDER_JOB_PIPE_READ); + netdata_log_debug(D_STREAM, "STREAM: Data added to send buffer (current buffer chunk %zu bytes)...", outstanding); + + if (read(fds[Collector].fd, thread_data->pipe_buffer, pipe_buffer_size) == -1) + netdata_log_error("STREAM %s [send to %s]: cannot read from internal pipe.", rrdhost_hostname(s->host), s->connected_to); + } + + // Read as much as possible to fill the buffer, split into full lines for execution. + if (fds[Socket].revents & POLLIN) { + worker_is_busy(WORKER_SENDER_JOB_SOCKET_RECEIVE); + ssize_t bytes = attempt_read(s); + if(bytes > 0) { + s->last_traffic_seen_t = now_monotonic_sec(); + worker_set_metric(WORKER_SENDER_JOB_BYTES_RECEIVED, (NETDATA_DOUBLE)bytes); + } + } + + if(unlikely(s->read_len)) + execute_commands(s); + + if(unlikely(fds[Collector].revents & (POLLERR|POLLHUP|POLLNVAL))) { + char *error = NULL; + + if (unlikely(fds[Collector].revents & POLLERR)) + error = "pipe reports errors (POLLERR)"; + else if (unlikely(fds[Collector].revents & POLLHUP)) + error = "pipe closed (POLLHUP)"; + else if (unlikely(fds[Collector].revents & POLLNVAL)) + error = "pipe is invalid (POLLNVAL)"; + + if(error) { + rrdpush_sender_pipe_close(s->host, s->rrdpush_sender_pipe, true); + netdata_log_error("STREAM %s [send to %s]: restarting internal pipe: %s.", + rrdhost_hostname(s->host), s->connected_to, error); + } + } + + if(unlikely(fds[Socket].revents & (POLLERR|POLLHUP|POLLNVAL))) { + 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)) { + worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_SOCKET_ERROR); + netdata_log_error("STREAM %s [send to %s]: restarting connection: %s - %zu bytes transmitted.", + rrdhost_hostname(s->host), s->connected_to, error, s->sent_bytes_on_this_connection); + rrdpush_sender_thread_close_socket(s->host); + } + } + + // protection from overflow + if(unlikely(s->flags & SENDER_FLAG_OVERFLOW)) { + worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_OVERFLOW); + errno = 0; + netdata_log_error("STREAM %s [send to %s]: buffer full (allocated %zu bytes) after sending %zu bytes. Restarting connection", + rrdhost_hostname(s->host), s->connected_to, s->buffer->size, s->sent_bytes_on_this_connection); + rrdpush_sender_thread_close_socket(s->host); + } + + worker_set_metric(WORKER_SENDER_JOB_REPLAY_DICT_SIZE, (NETDATA_DOUBLE) dictionary_entries(s->replication.requests)); + } + + netdata_thread_cleanup_pop(1); + return NULL; +} |