path: root/streaming/receiver.c

// SPDX-License-Identifier: GPL-3.0-or-later

#include "rrdpush.h"
#include "parser/parser.h"

// IMPORTANT: to add workers, you have to edit WORKER_PARSER_FIRST_JOB accordingly
#define WORKER_RECEIVER_JOB_BYTES_READ (WORKER_PARSER_FIRST_JOB - 1)
#define WORKER_RECEIVER_JOB_BYTES_UNCOMPRESSED (WORKER_PARSER_FIRST_JOB - 2)

// this has to be the same at parser.h
#define WORKER_RECEIVER_JOB_REPLICATION_COMPLETION (WORKER_PARSER_FIRST_JOB - 3)

#if WORKER_PARSER_FIRST_JOB < 1
#error The define WORKER_PARSER_FIRST_JOB needs to be at least 1
#endif

extern struct config stream_config;

void destroy_receiver_state(struct receiver_state *rpt) {
    freez(rpt->key);
    freez(rpt->hostname);
    freez(rpt->registry_hostname);
    freez(rpt->machine_guid);
    freez(rpt->os);
    freez(rpt->timezone);
    freez(rpt->abbrev_timezone);
    freez(rpt->tags);
    freez(rpt->client_ip);
    freez(rpt->client_port);
    freez(rpt->program_name);
    freez(rpt->program_version);
#ifdef ENABLE_HTTPS
    if(rpt->ssl.conn){
        SSL_free(rpt->ssl.conn);
    }
#endif
#ifdef ENABLE_COMPRESSION
    if (rpt->decompressor)
        rpt->decompressor->destroy(&rpt->decompressor);
#endif
    freez(rpt);
}

static void rrdpush_receiver_thread_cleanup(void *ptr) {
    worker_unregister();

    static __thread int executed = 0;
    if(!executed) {
        executed = 1;
        struct receiver_state *rpt = (struct receiver_state *) ptr;
        // If the shutdown sequence has started, and this receiver is still attached to the host then we cannot touch
        // the host pointer as it is unpredictable when the RRDHOST is deleted. Do the cleanup from rrdhost_free().
        if (netdata_exit && rpt->host) {
            rpt->exited = 1;
            return;
        }

        // Make sure that we detach this thread and don't kill a freshly arriving receiver
        if (!netdata_exit && rpt->host) {
            netdata_mutex_lock(&rpt->host->receiver_lock);
            if (rpt->host->receiver == rpt)
                rpt->host->receiver = NULL;
            netdata_mutex_unlock(&rpt->host->receiver_lock);
        }

        info("STREAM %s [receive from [%s]:%s]: receive thread ended (task id %d)", rpt->hostname, rpt->client_ip, rpt->client_port, gettid());
        destroy_receiver_state(rpt);
    }
}

#include "collectors/plugins.d/pluginsd_parser.h"

PARSER_RC streaming_claimed_id(char **words, size_t num_words, void *user)
{
    const char *host_uuid_str = get_word(words, num_words, 1);
    const char *claim_id_str = get_word(words, num_words, 2);

    if (!host_uuid_str || !claim_id_str) {
        error("Command CLAIMED_ID came malformed, uuid = '%s', claim_id = '%s'",
              host_uuid_str ? host_uuid_str : "[unset]",
              claim_id_str ? claim_id_str : "[unset]");
        return PARSER_RC_ERROR;
    }

    uuid_t uuid;
    RRDHOST *host = ((PARSER_USER_OBJECT *)user)->host;

    // We don't need the parsed UUID
    // just do it to check the format
    if(uuid_parse(host_uuid_str, uuid)) {
        error("1st parameter (host GUID) to CLAIMED_ID command is not valid GUID. Received: \"%s\".", host_uuid_str);
        return PARSER_RC_ERROR;
    }
    if(uuid_parse(claim_id_str, uuid) && strcmp(claim_id_str, "NULL")) {
        error("2nd parameter (Claim ID) to CLAIMED_ID command is not valid GUID. Received: \"%s\".", claim_id_str);
        return PARSER_RC_ERROR;
    }

    if(strcmp(host_uuid_str, host->machine_guid)) {
        error("Claim ID is for host \"%s\" but it came over connection for \"%s\"", host_uuid_str, host->machine_guid);
        return PARSER_RC_OK; //the message is OK problem must be somewhere else
    }

    rrdhost_aclk_state_lock(host);
    if (host->aclk_state.claimed_id)
        freez(host->aclk_state.claimed_id);
    host->aclk_state.claimed_id = strcmp(claim_id_str, "NULL") ? strdupz(claim_id_str) : NULL;

    metaqueue_store_claim_id(&host->host_uuid, host->aclk_state.claimed_id ? &uuid : NULL);

    rrdhost_aclk_state_unlock(host);

    rrdpush_claimed_id(host);

    return PARSER_RC_OK;
}

static int read_stream(struct receiver_state *r, char* buffer, size_t size) {
    if(unlikely(!size)) {
        internal_error(true, "%s() asked to read zero bytes", __FUNCTION__);
        return 0;
    }

#ifdef ENABLE_HTTPS
    if (r->ssl.conn && r->ssl.flags == NETDATA_SSL_HANDSHAKE_COMPLETE)
        return (int)netdata_ssl_read(r->ssl.conn, buffer, size);
#endif

    ssize_t bytes_read = read(r->fd, buffer, size);
    if(bytes_read == 0 && (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINPROGRESS)) {
        error("STREAM: %s(): timeout while waiting for data on socket!", __FUNCTION__);
        bytes_read = -3;
    }
    else if (bytes_read == 0) {
        error("STREAM: %s(): EOF while reading data from socket!", __FUNCTION__);
        bytes_read = -1;
    }
    else if (bytes_read < 0) {
        error("STREAM: %s() failed to read from socket!", __FUNCTION__);
        bytes_read = -2;
    }

//    do {
//        bytes_read = (int) fread(buffer, 1, size, fp);
//        if (unlikely(bytes_read <= 0)) {
//            if(feof(fp)) {
//                internal_error(true, "%s(): fread() failed with EOF", __FUNCTION__);
//                bytes_read = -2;
//            }
//            else if(ferror(fp)) {
//                internal_error(true, "%s(): fread() failed with ERROR", __FUNCTION__);
//                bytes_read = -3;
//            }
//            else bytes_read = 0;
//        }
//        else
//            worker_set_metric(WORKER_RECEIVER_JOB_BYTES_READ, bytes_read);
//    } while(bytes_read == 0);

    return (int)bytes_read;
}

static bool receiver_read_uncompressed(struct receiver_state *r) {
#ifdef NETDATA_INTERNAL_CHECKS
    if(r->read_buffer[r->read_len] != '\0')
        fatal("%s(): read_buffer does not start with zero", __FUNCTION__ );
#endif

    int bytes_read = read_stream(r, r->read_buffer + r->read_len, sizeof(r->read_buffer) - r->read_len - 1);
    if(unlikely(bytes_read <= 0))
        return false;

    worker_set_metric(WORKER_RECEIVER_JOB_BYTES_READ, (NETDATA_DOUBLE)bytes_read);
    worker_set_metric(WORKER_RECEIVER_JOB_BYTES_UNCOMPRESSED, (NETDATA_DOUBLE)bytes_read);

    r->read_len += bytes_read;
    r->read_buffer[r->read_len] = '\0';

    return true;
}

#ifdef ENABLE_COMPRESSION
static bool receiver_read_compressed(struct receiver_state *r) {

#ifdef NETDATA_INTERNAL_CHECKS
    if(r->read_buffer[r->read_len] != '\0')
        fatal("%s: read_buffer does not start with zero #2", __FUNCTION__ );
#endif

    // first use any available uncompressed data
    if (r->decompressor->decompressed_bytes_in_buffer(r->decompressor)) {
        size_t available = sizeof(r->read_buffer) - r->read_len - 1;
        if (available) {
            size_t len = r->decompressor->get(r->decompressor, r->read_buffer + r->read_len, available);
            if (!len) {
                internal_error(true, "decompressor returned zero length #1");
                return false;
            }

            r->read_len += (int)len;
            r->read_buffer[r->read_len] = '\0';
        }
        else
            internal_error(true, "The line to read is too big! Already have %d bytes in read_buffer.", r->read_len);

        return true;
    }

    // no decompressed data available
    // read the compression signature of the next block

    if(unlikely(r->read_len + r->decompressor->signature_size > sizeof(r->read_buffer) - 1)) {
        internal_error(true, "The last incomplete line does not leave enough room for the next compression header! Already have %d bytes in read_buffer.", r->read_len);
        return false;
    }

    // read the compression signature from the stream
    // we have to do a loop here, because read_stream() may return less than the data we need
    int bytes_read = 0;
    do {
        int ret = read_stream(r, r->read_buffer + r->read_len + bytes_read, r->decompressor->signature_size - bytes_read);
        if (unlikely(ret <= 0))
            return false;

        bytes_read += ret;
    } while(unlikely(bytes_read < (int)r->decompressor->signature_size));

    worker_set_metric(WORKER_RECEIVER_JOB_BYTES_READ, (NETDATA_DOUBLE)bytes_read);

    if(unlikely(bytes_read != (int)r->decompressor->signature_size))
        fatal("read %d bytes, but expected compression signature of size %zu", bytes_read, r->decompressor->signature_size);

    size_t compressed_message_size = r->decompressor->start(r->decompressor, r->read_buffer + r->read_len, bytes_read);
    if (unlikely(!compressed_message_size)) {
        internal_error(true, "multiplexed uncompressed data in compressed stream!");
        r->read_len += bytes_read;
        r->read_buffer[r->read_len] = '\0';
        return true;
    }

    if(unlikely(compressed_message_size > COMPRESSION_MAX_MSG_SIZE)) {
        error("received a compressed message of %zu bytes, which is bigger than the max compressed message size supported of %zu. Ignoring message.",
              compressed_message_size, (size_t)COMPRESSION_MAX_MSG_SIZE);
        return false;
    }

    // delete compression header from our read buffer
    r->read_buffer[r->read_len] = '\0';

    // Read the entire compressed block of compressed data
    char compressed[compressed_message_size];
    size_t compressed_bytes_read = 0;
    do {
        size_t start = compressed_bytes_read;
        size_t remaining = compressed_message_size - start;

        int last_read_bytes = read_stream(r, &compressed[start], remaining);
        if (unlikely(last_read_bytes <= 0)) {
            internal_error(true, "read_stream() failed #2, with code %d", last_read_bytes);
            return false;
        }

        compressed_bytes_read += last_read_bytes;

    } while(unlikely(compressed_message_size > compressed_bytes_read));

    worker_set_metric(WORKER_RECEIVER_JOB_BYTES_READ, (NETDATA_DOUBLE)compressed_bytes_read);

    // decompress the compressed block
    size_t bytes_to_parse = r->decompressor->decompress(r->decompressor, compressed, compressed_bytes_read);
    if (!bytes_to_parse) {
        internal_error(true, "no bytes to parse.");
        return false;
    }

    worker_set_metric(WORKER_RECEIVER_JOB_BYTES_UNCOMPRESSED, (NETDATA_DOUBLE)bytes_to_parse);

    // fill read buffer with decompressed data
    size_t len = (int)r->decompressor->get(r->decompressor, r->read_buffer + r->read_len, sizeof(r->read_buffer) - r->read_len - 1);
    if (!len) {
        internal_error(true, "decompressor returned zero length #2");
        return false;
    }
    r->read_len += (int)len;
    r->read_buffer[r->read_len] = '\0';

    return true;
}
#else // !ENABLE_COMPRESSION
static bool receiver_read_compressed(struct receiver_state *r) {
    return receiver_read_uncompressed(r);
}
#endif // ENABLE_COMPRESSION

/* Produce a full line if one exists, statefully return where we start next time.
 * When we hit the end of the buffer with a partial line move it to the beginning for the next fill.
 */
static char *receiver_next_line(struct receiver_state *r, char *buffer, size_t buffer_length, size_t *pos) {
    size_t start = *pos;

    char *ss = &r->read_buffer[start];
    char *se = &r->read_buffer[r->read_len];
    char *ds = buffer;
    char *de = &buffer[buffer_length - 2];

    if(ss >= se) {
        *ds = '\0';
        *pos = 0;
        r->read_len = 0;
        r->read_buffer[r->read_len] = '\0';
        return NULL;
    }

    // copy all bytes to buffer
    while(ss < se && ds < de && *ss != '\n')
        *ds++ = *ss++;

    // if we have a newline, return the buffer
    if(ss < se && ds < de && *ss == '\n') {
        // newline found in the r->read_buffer

        *ds++ = *ss++; // copy the newline too
        *ds = '\0';

        *pos = ss - r->read_buffer;
        return buffer;
    }

    // if the destination is full, oops!
    if(ds == de) {
        error("STREAM: received line exceeds %d bytes. Truncating it.", PLUGINSD_LINE_MAX);
        *ds = '\0';
        *pos = ss - r->read_buffer;
        return buffer;
    }

    // no newline found in the r->read_buffer
    // move everything to the beginning
    memmove(r->read_buffer, &r->read_buffer[start], r->read_len - start);
    r->read_len -= (int)start;
    r->read_buffer[r->read_len] = '\0';
    *ds = '\0';
    *pos = 0;
    return NULL;
}

static void streaming_parser_thread_cleanup(void *ptr) {
    PARSER *parser = (PARSER *)ptr;
    rrd_collector_finished();
    parser_destroy(parser);
}

static size_t streaming_parser(struct receiver_state *rpt, struct plugind *cd, int fd, void *ssl) {
    size_t result;

    PARSER_USER_OBJECT user = {
        .enabled = cd->enabled,
        .host = rpt->host,
        .opaque = rpt,
        .cd = cd,
        .trust_durations = 1
    };

    PARSER *parser = parser_init(rpt->host, &user, NULL, NULL, fd, PARSER_INPUT_SPLIT, ssl);

    rrd_collector_started();

    // this keeps the parser with its current value
    // so, parser needs to be allocated before pushing it
    netdata_thread_cleanup_push(streaming_parser_thread_cleanup, parser);

    parser_add_keyword(parser, "CLAIMED_ID", streaming_claimed_id);

    user.parser = parser;

    bool compressed_connection = false;
#ifdef ENABLE_COMPRESSION
    if(stream_has_capability(rpt, STREAM_CAP_COMPRESSION)) {
        compressed_connection = true;

        if (!rpt->decompressor)
            rpt->decompressor = create_decompressor();
        else
            rpt->decompressor->reset(rpt->decompressor);
    }
#endif

    rpt->read_buffer[0] = '\0';
    rpt->read_len = 0;

    size_t read_buffer_start = 0;
    char buffer[PLUGINSD_LINE_MAX + 2] = "";
    while(!netdata_exit) {
        if(!receiver_next_line(rpt, buffer, PLUGINSD_LINE_MAX + 2, &read_buffer_start)) {
            bool have_new_data;
            if(compressed_connection)
                have_new_data = receiver_read_compressed(rpt);
            else
                have_new_data = receiver_read_uncompressed(rpt);

            if(!have_new_data)
                break;

            rpt->last_msg_t = now_realtime_sec();
            continue;
        }

        if(unlikely(netdata_exit)) {
            internal_error(true, "exiting...");
            goto done;
        }
        if(unlikely(rpt->shutdown)) {
            internal_error(true, "parser shutdown...");
            goto done;
        }

        if (unlikely(parser_action(parser,  buffer))) {
            internal_error(true, "parser_action() failed on keyword '%s'.", buffer);
            break;
        }
    }

done:
    internal_error(true, "Streaming receiver thread stopping...");

    result = user.count;

    // free parser with the pop function
    netdata_thread_cleanup_pop(1);

    return result;
}

static void rrdpush_receiver_replication_reset(struct receiver_state *rpt) {
    RRDSET *st;
    rrdset_foreach_read(st, rpt->host) {
        rrdset_flag_clear(st, RRDSET_FLAG_RECEIVER_REPLICATION_IN_PROGRESS);
        rrdset_flag_set(st, RRDSET_FLAG_RECEIVER_REPLICATION_FINISHED);
    }
    rrdset_foreach_done(st);
    rrdhost_receiver_replicating_charts_zero(rpt->host);
}

static int rrdpush_receive(struct receiver_state *rpt)
{
    int history = default_rrd_history_entries;
    RRD_MEMORY_MODE mode = default_rrd_memory_mode;
    int health_enabled = default_health_enabled;
    int rrdpush_enabled = default_rrdpush_enabled;
    char *rrdpush_destination = default_rrdpush_destination;
    char *rrdpush_api_key = default_rrdpush_api_key;
    char *rrdpush_send_charts_matching = default_rrdpush_send_charts_matching;
    bool rrdpush_enable_replication = default_rrdpush_enable_replication;
    time_t rrdpush_seconds_to_replicate = default_rrdpush_seconds_to_replicate;
    time_t rrdpush_replication_step = default_rrdpush_replication_step;
    time_t alarms_delay = 60;

    rpt->update_every = (int)appconfig_get_number(&stream_config, rpt->machine_guid, "update every", rpt->update_every);
    if(rpt->update_every < 0) rpt->update_every = 1;

    history = (int)appconfig_get_number(&stream_config, rpt->key, "default history", history);
    history = (int)appconfig_get_number(&stream_config, rpt->machine_guid, "history", history);
    if(history < 5) history = 5;

    mode = rrd_memory_mode_id(appconfig_get(&stream_config, rpt->key, "default memory mode", rrd_memory_mode_name(mode)));
    mode = rrd_memory_mode_id(appconfig_get(&stream_config, rpt->machine_guid, "memory mode", rrd_memory_mode_name(mode)));

    if (unlikely(mode == RRD_MEMORY_MODE_DBENGINE && !dbengine_enabled)) {
        error("STREAM %s [receive from %s:%s]: dbengine is not enabled, falling back to default.", rpt->hostname, rpt->client_ip, rpt->client_port);
        mode = default_rrd_memory_mode;
    }

    health_enabled = appconfig_get_boolean_ondemand(&stream_config, rpt->key, "health enabled by default", health_enabled);
    health_enabled = appconfig_get_boolean_ondemand(&stream_config, rpt->machine_guid, "health enabled", health_enabled);

    alarms_delay = appconfig_get_number(&stream_config, rpt->key, "default postpone alarms on connect seconds", alarms_delay);
    alarms_delay = appconfig_get_number(&stream_config, rpt->machine_guid, "postpone alarms on connect seconds", alarms_delay);

    rrdpush_enabled = appconfig_get_boolean(&stream_config, rpt->key, "default proxy enabled", rrdpush_enabled);
    rrdpush_enabled = appconfig_get_boolean(&stream_config, rpt->machine_guid, "proxy enabled", rrdpush_enabled);

    rrdpush_destination = appconfig_get(&stream_config, rpt->key, "default proxy destination", rrdpush_destination);
    rrdpush_destination = appconfig_get(&stream_config, rpt->machine_guid, "proxy destination", rrdpush_destination);

    rrdpush_api_key = appconfig_get(&stream_config, rpt->key, "default proxy api key", rrdpush_api_key);
    rrdpush_api_key = appconfig_get(&stream_config, rpt->machine_guid, "proxy api key", rrdpush_api_key);

    rrdpush_send_charts_matching = appconfig_get(&stream_config, rpt->key, "default proxy send charts matching", rrdpush_send_charts_matching);
    rrdpush_send_charts_matching = appconfig_get(&stream_config, rpt->machine_guid, "proxy send charts matching", rrdpush_send_charts_matching);

    rrdpush_enable_replication = appconfig_get_boolean(&stream_config, rpt->key, "enable replication", rrdpush_enable_replication);
    rrdpush_enable_replication = appconfig_get_boolean(&stream_config, rpt->machine_guid, "enable replication", rrdpush_enable_replication);

    rrdpush_seconds_to_replicate = appconfig_get_number(&stream_config, rpt->key, "seconds to replicate", rrdpush_seconds_to_replicate);
    rrdpush_seconds_to_replicate = appconfig_get_number(&stream_config, rpt->machine_guid, "seconds to replicate", rrdpush_seconds_to_replicate);

    rrdpush_replication_step = appconfig_get_number(&stream_config, rpt->key, "seconds per replication step", rrdpush_replication_step);
    rrdpush_replication_step = appconfig_get_number(&stream_config, rpt->machine_guid, "seconds per replication step", rrdpush_replication_step);

#ifdef  ENABLE_COMPRESSION
    unsigned int rrdpush_compression = default_compression_enabled;
    rrdpush_compression = appconfig_get_boolean(&stream_config, rpt->key, "enable compression", rrdpush_compression);
    rrdpush_compression = appconfig_get_boolean(&stream_config, rpt->machine_guid, "enable compression", rrdpush_compression);
    rpt->rrdpush_compression = (rrdpush_compression && default_compression_enabled);
#endif  //ENABLE_COMPRESSION

    (void)appconfig_set_default(&stream_config, rpt->machine_guid, "host tags", (rpt->tags)?rpt->tags:"");

    if (strcmp(rpt->machine_guid, localhost->machine_guid) == 0) {
        log_stream_connection(rpt->client_ip, rpt->client_port, rpt->key, rpt->machine_guid, rpt->hostname, "DENIED - ATTEMPT TO RECEIVE METRICS FROM MACHINE_GUID IDENTICAL TO PARENT");
        error("STREAM %s [receive from %s:%s]: denied to receive metrics, machine GUID [%s] is my own. Did you copy the parent/proxy machine GUID to a child, or is this an inter-agent loop?", rpt->hostname, rpt->client_ip, rpt->client_port, rpt->machine_guid);
        char initial_response[HTTP_HEADER_SIZE + 1];
        snprintfz(initial_response, HTTP_HEADER_SIZE, "%s", START_STREAMING_ERROR_SAME_LOCALHOST);
#ifdef ENABLE_HTTPS
        if(send_timeout(&rpt->ssl, rpt->fd, initial_response, strlen(initial_response), 0, 60) != (ssize_t)strlen(initial_response)) {
#else
        if(send_timeout(rpt->fd, initial_response, strlen(initial_response), 0, 60) != strlen(initial_response)) {
#endif
            log_stream_connection(rpt->client_ip, rpt->client_port, rpt->key, rpt->host->machine_guid, rrdhost_hostname(rpt->host), "FAILED - CANNOT REPLY");
            error("STREAM %s [receive from [%s]:%s]: cannot send command.", rrdhost_hostname(rpt->host), rpt->client_ip, rpt->client_port);
            close(rpt->fd);
            return 0;
        }
        close(rpt->fd);
        return 0;
    }

    if (rpt->host==NULL) {

        rpt->host = rrdhost_find_or_create(
                rpt->hostname
                , rpt->registry_hostname
                , rpt->machine_guid
                , rpt->os
                , rpt->timezone
                , rpt->abbrev_timezone
                , rpt->utc_offset
                , rpt->tags
                , rpt->program_name
                , rpt->program_version
                , rpt->update_every
                , history
                , mode
                , (unsigned int)(health_enabled != CONFIG_BOOLEAN_NO)
                , (unsigned int)(rrdpush_enabled && rrdpush_destination && *rrdpush_destination && rrdpush_api_key && *rrdpush_api_key)
                , rrdpush_destination
                , rrdpush_api_key
                , rrdpush_send_charts_matching
                , rrdpush_enable_replication
                , rrdpush_seconds_to_replicate
                , rrdpush_replication_step
                , rpt->system_info
                , 0
        );

        if(!rpt->host) {
            close(rpt->fd);
            log_stream_connection(rpt->client_ip, rpt->client_port, rpt->key, rpt->machine_guid, rpt->hostname, "FAILED - CANNOT ACQUIRE HOST");
            error("STREAM %s [receive from [%s]:%s]: failed to find/create host structure.", rpt->hostname, rpt->client_ip, rpt->client_port);
            return 1;
        }

        netdata_mutex_lock(&rpt->host->receiver_lock);
        if (rpt->host->receiver == NULL)
            rpt->host->receiver = rpt;
        else {
            error("Multiple receivers connected for %s concurrently, cancelling this one...", rpt->machine_guid);
            netdata_mutex_unlock(&rpt->host->receiver_lock);
            close(rpt->fd);
            log_stream_connection(rpt->client_ip, rpt->client_port, rpt->key, rpt->machine_guid, rpt->hostname, "FAILED - BEATEN TO HOST CREATION");
            return 1;
        }
        netdata_mutex_unlock(&rpt->host->receiver_lock);
    }
    else {
        rrd_wrlock();
        rrdhost_update(
            rpt->host,
            rpt->hostname,
            rpt->registry_hostname,
            rpt->machine_guid,
            rpt->os,
            rpt->timezone,
            rpt->abbrev_timezone,
            rpt->utc_offset,
            rpt->tags,
            rpt->program_name,
            rpt->program_version,
            rpt->update_every,
            history,
            mode,
            (unsigned int)(health_enabled != CONFIG_BOOLEAN_NO),
            (unsigned int)(rrdpush_enabled && rrdpush_destination && *rrdpush_destination && rrdpush_api_key && *rrdpush_api_key),
            rrdpush_destination,
            rrdpush_api_key,
            rrdpush_send_charts_matching,
            rrdpush_enable_replication,
            rrdpush_seconds_to_replicate,
            rrdpush_replication_step,
            rpt->system_info);
        rrd_unlock();
    }

#ifdef NETDATA_INTERNAL_CHECKS
    int ssl = 0;
#ifdef ENABLE_HTTPS
    if (rpt->ssl.conn != NULL)
        ssl = 1;
#endif
    info("STREAM %s [receive from [%s]:%s]: client willing to stream metrics for host '%s' with machine_guid '%s': update every = %d, history = %ld, memory mode = %s, health %s,%s tags '%s'"
         , rpt->hostname
         , rpt->client_ip
         , rpt->client_port
         , rrdhost_hostname(rpt->host)
         , rpt->host->machine_guid
         , rpt->host->rrd_update_every
         , rpt->host->rrd_history_entries
         , rrd_memory_mode_name(rpt->host->rrd_memory_mode)
         , (health_enabled == CONFIG_BOOLEAN_NO)?"disabled":((health_enabled == CONFIG_BOOLEAN_YES)?"enabled":"auto")
         , ssl ? " SSL," : ""
         , rrdhost_tags(rpt->host)
    );
#endif // NETDATA_INTERNAL_CHECKS


    struct plugind cd = {
            .enabled = 1,
            .update_every = default_rrd_update_every,
            .pid = 0,
            .serial_failures = 0,
            .successful_collections = 0,
            .obsolete = 0,
            .started_t = now_realtime_sec(),
            .next = NULL,
            .capabilities = 0,
    };

    // put the client IP and port into the buffers used by plugins.d
    snprintfz(cd.id,           CONFIG_MAX_NAME,  "%s:%s", rpt->client_ip, rpt->client_port);
    snprintfz(cd.filename,     FILENAME_MAX,     "%s:%s", rpt->client_ip, rpt->client_port);
    snprintfz(cd.fullfilename, FILENAME_MAX,     "%s:%s", rpt->client_ip, rpt->client_port);
    snprintfz(cd.cmd,          PLUGINSD_CMD_MAX, "%s:%s", rpt->client_ip, rpt->client_port);

#ifdef ENABLE_COMPRESSION
    if (stream_has_capability(rpt, STREAM_CAP_COMPRESSION)) {
        if (!rpt->rrdpush_compression)
            rpt->capabilities &= ~STREAM_CAP_COMPRESSION;
    }
#endif

    info("STREAM %s [receive from [%s]:%s]: initializing communication...", rrdhost_hostname(rpt->host), rpt->client_ip, rpt->client_port);
    char initial_response[HTTP_HEADER_SIZE];
    if (stream_has_capability(rpt, STREAM_CAP_VCAPS)) {
        log_receiver_capabilities(rpt);
        sprintf(initial_response, "%s%u", START_STREAMING_PROMPT_VN, rpt->capabilities);
    }
    else if (stream_has_capability(rpt, STREAM_CAP_VN)) {
        log_receiver_capabilities(rpt);
        sprintf(initial_response, "%s%d", START_STREAMING_PROMPT_VN, stream_capabilities_to_vn(rpt->capabilities));
    } else if (stream_has_capability(rpt, STREAM_CAP_V2)) {
        log_receiver_capabilities(rpt);
        sprintf(initial_response, "%s", START_STREAMING_PROMPT_V2);
    } else { // stream_has_capability(rpt, STREAM_CAP_V1)
        log_receiver_capabilities(rpt);
        sprintf(initial_response, "%s", START_STREAMING_PROMPT_V1);
    }
    debug(D_STREAM, "Initial response to %s: %s", rpt->client_ip, initial_response);
#ifdef ENABLE_HTTPS
    if(send_timeout(&rpt->ssl, rpt->fd, initial_response, strlen(initial_response), 0, 60) != (ssize_t)strlen(initial_response)) {
#else
    if(send_timeout(rpt->fd, initial_response, strlen(initial_response), 0, 60) != strlen(initial_response)) {
#endif
        log_stream_connection(rpt->client_ip, rpt->client_port, rpt->key, rpt->host->machine_guid, rrdhost_hostname(rpt->host), "FAILED - CANNOT REPLY");
        error("STREAM %s [receive from [%s]:%s]: cannot send ready command.", rrdhost_hostname(rpt->host), rpt->client_ip, rpt->client_port);
        close(rpt->fd);
        return 0;
    }

    // remove the non-blocking flag from the socket
    if(sock_delnonblock(rpt->fd) < 0)
        error("STREAM %s [receive from [%s]:%s]: cannot remove the non-blocking flag from socket %d", rrdhost_hostname(rpt->host), rpt->client_ip, rpt->client_port, rpt->fd);

    struct timeval timeout;
    timeout.tv_sec = 600;
    timeout.tv_usec = 0;
    if (unlikely(setsockopt(rpt->fd, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof timeout) != 0))
        error("STREAM %s [receive from [%s]:%s]: cannot set timeout for socket %d", rrdhost_hostname(rpt->host), rpt->client_ip, rpt->client_port, rpt->fd);

    rrdhost_wrlock(rpt->host);
/* if(rpt->host->connected_senders > 0) {
        rrdhost_unlock(rpt->host);
        log_stream_connection(rpt->client_ip, rpt->client_port, rpt->key, rpt->host->machine_guid, rpt->host->hostname, "REJECTED - ALREADY CONNECTED");
        info("STREAM %s [receive from [%s]:%s]: multiple streaming connections for the same host detected. Rejecting new connection.", rpt->host->hostname, rpt->client_ip, rpt->client_port);
        fclose(fp);
        return 0;
    }
*/

//    rpt->host->connected_senders++;
    if(health_enabled != CONFIG_BOOLEAN_NO) {
        if(alarms_delay > 0) {
            rpt->host->health_delay_up_to = now_realtime_sec() + alarms_delay;
            log_health(
                "[%s]: Postponing health checks for %" PRId64 " seconds, because it was just connected.",
                rrdhost_hostname(rpt->host),
                (int64_t)alarms_delay);
        }
    }
    rpt->host->senders_connect_time = now_realtime_sec();
    rpt->host->senders_last_chart_command = 0;
    rpt->host->trigger_chart_obsoletion_check = 1;

    rrdhost_unlock(rpt->host);

    // call the plugins.d processor to receive the metrics
    info("STREAM %s [receive from [%s]:%s]: receiving metrics...",
         rrdhost_hostname(rpt->host), rpt->client_ip, rpt->client_port);

    log_stream_connection(rpt->client_ip, rpt->client_port,
                          rpt->key, rpt->host->machine_guid, rrdhost_hostname(rpt->host), "CONNECTED");

    cd.capabilities = rpt->capabilities;

#ifdef ENABLE_ACLK
    // in case we have cloud connection we inform cloud
    // new child connected
    if (netdata_cloud_setting)
        aclk_host_state_update(rpt->host, 1);
#endif

    rrdhost_set_is_parent_label(++localhost->senders_count);

    rrdpush_receiver_replication_reset(rpt);
    rrdcontext_host_child_connected(rpt->host);

    rrdhost_flag_clear(rpt->host, RRDHOST_FLAG_RRDPUSH_RECEIVER_DISCONNECTED);

    size_t count = streaming_parser(rpt, &cd, rpt->fd,
#ifdef ENABLE_HTTPS
                                    (rpt->ssl.conn) ? &rpt->ssl : NULL
#else
                                    NULL
#endif
                                    );

    rrdhost_flag_set(rpt->host, RRDHOST_FLAG_RRDPUSH_RECEIVER_DISCONNECTED);

    log_stream_connection(rpt->client_ip, rpt->client_port,
                          rpt->key, rpt->host->machine_guid, rpt->hostname,
                          "DISCONNECTED");

    error("STREAM %s [receive from [%s]:%s]: disconnected (completed %zu updates).",
          rpt->hostname, rpt->client_ip, rpt->client_port, count);

    rrdcontext_host_child_disconnected(rpt->host);
    rrdpush_receiver_replication_reset(rpt);

#ifdef ENABLE_ACLK
    // in case we have cloud connection we inform cloud
    // a child disconnected
    if (netdata_cloud_setting)
        aclk_host_state_update(rpt->host, 0);
#endif

    rrdhost_set_is_parent_label(--localhost->senders_count);

    // During a shutdown there is cleanup code in rrdhost that will cancel the sender thread
    if (!netdata_exit && rpt->host) {
        rrd_rdlock();
        rrdhost_wrlock(rpt->host);
        netdata_mutex_lock(&rpt->host->receiver_lock);
        if (rpt->host->receiver == rpt) {
            rpt->host->senders_connect_time = 0;
            rpt->host->trigger_chart_obsoletion_check = 0;
            rpt->host->senders_disconnected_time = now_realtime_sec();
            rrdhost_flag_set(rpt->host, RRDHOST_FLAG_ORPHAN);
            if(health_enabled == CONFIG_BOOLEAN_AUTO)
                rpt->host->health_enabled = 0;
        }
        rrdhost_unlock(rpt->host);
        if (rpt->host->receiver == rpt) {
            rrdpush_sender_thread_stop(rpt->host);
        }
        netdata_mutex_unlock(&rpt->host->receiver_lock);
        rrd_unlock();
    }

    // cleanup
    close(rpt->fd);
    return (int)count;
}

void *rrdpush_receiver_thread(void *ptr) {
    netdata_thread_cleanup_push(rrdpush_receiver_thread_cleanup, ptr);

    struct receiver_state *rpt = (struct receiver_state *)ptr;
    info("STREAM %s [%s]:%s: receive thread created (task id %d)", rpt->hostname, rpt->client_ip, rpt->client_port, gettid());

    worker_register("STREAMRCV");
    worker_register_job_custom_metric(WORKER_RECEIVER_JOB_BYTES_READ, "received bytes", "bytes/s", WORKER_METRIC_INCREMENT);
    worker_register_job_custom_metric(WORKER_RECEIVER_JOB_BYTES_UNCOMPRESSED, "uncompressed bytes", "bytes/s", WORKER_METRIC_INCREMENT);
    worker_register_job_custom_metric(WORKER_RECEIVER_JOB_REPLICATION_COMPLETION, "replication completion", "%", WORKER_METRIC_ABSOLUTE);
    rrdpush_receive(rpt);
    worker_unregister();

    netdata_thread_cleanup_pop(1);
    return NULL;
}