Merging upstream version 1.45.3+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 1865 deletions

diff --git a/streaming/sender.c b/streaming/sender.c
deleted file mode 100644
index 09b67e968..000000000
--- a/streaming/sender.c
+++ /dev/null
@@ -1,1865 +0,0 @@
-// 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"
-                 "&registry_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;
-}