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netdata/streaming/receiver.c

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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rrdpush.h"
extern struct config stream_config;
static void rrdpush_receiver_thread_cleanup(void *ptr) {
static __thread int executed = 0;
if(!executed) {
executed = 1;
struct receiver_state *rpt = (struct receiver_state *) ptr;
// Make sure that we detach this thread and don't kill a freshly arriving receiver
if (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());
freez(rpt->key);
freez(rpt->hostname);
freez(rpt->registry_hostname);
freez(rpt->machine_guid);
freez(rpt->os);
freez(rpt->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
freez(rpt);
}
}
#include "../collectors/plugins.d/pluginsd_parser.h"
PARSER_RC streaming_timestamp(char **words, void *user, PLUGINSD_ACTION *plugins_action)
{
UNUSED(plugins_action);
char *remote_time_txt = words[1];
time_t remote_time = 0;
RRDHOST *host = ((PARSER_USER_OBJECT *)user)->host;
struct plugind *cd = ((PARSER_USER_OBJECT *)user)->cd;
if (cd->version < VERSION_GAP_FILLING ) {
error("STREAM %s from %s: Slave negotiated version %u but sent TIMESTAMP!", host->hostname, cd->cmd,
cd->version);
return PARSER_RC_OK; // Ignore error and continue stream
}
if (remote_time_txt && *remote_time_txt) {
remote_time = str2ull(remote_time_txt);
time_t now = now_realtime_sec(), prev = rrdhost_last_entry_t(host);
time_t gap = 0;
if (prev == 0)
info("STREAM %s from %s: Initial connection (no gap to check), remote=%ld local=%ld slew=%ld",
host->hostname, cd->cmd, remote_time, now, now-remote_time);
else {
gap = now - prev;
info("STREAM %s from %s: Checking for gaps... remote=%ld local=%ld..%ld slew=%ld %ld-sec gap",
host->hostname, cd->cmd, remote_time, prev, now, remote_time - now, gap);
}
char message[128];
sprintf(message,"REPLICATE %ld %ld\n", remote_time - gap, remote_time);
int ret;
#ifdef ENABLE_HTTPS
SSL *conn = host->stream_ssl.conn ;
if(conn && !host->stream_ssl.flags) {
ret = SSL_write(conn, message, strlen(message));
} else {
ret = send(host->receiver->fd, message, strlen(message), MSG_DONTWAIT);
}
#else
ret = send(host->receiver->fd, message, strlen(message), MSG_DONTWAIT);
#endif
if (ret != (int)strlen(message))
error("Failed to send initial timestamp - gaps may appear in charts");
return PARSER_RC_OK;
}
return PARSER_RC_ERROR;
}
/* The receiver socket is blocking, perform a single read into a buffer so that we can reassemble lines for parsing.
*/
static int receiver_read(struct receiver_state *r, FILE *fp) {
#ifdef ENABLE_HTTPS
if (r->ssl.conn && !r->ssl.flags) {
ERR_clear_error();
int desired = sizeof(r->read_buffer) - r->read_len - 1;
int ret = SSL_read(r->ssl.conn, r->read_buffer + r->read_len, desired);
if (ret > 0 ) {
r->read_len += ret;
return 0;
}
// Don't treat SSL_ERROR_WANT_READ or SSL_ERROR_WANT_WRITE differently on blocking socket
u_long err;
char buf[256];
while ((err = ERR_get_error()) != 0) {
ERR_error_string_n(err, buf, sizeof(buf));
error("STREAM %s [receive from %s] ssl error: %s", r->hostname, r->client_ip, buf);
}
return 1;
}
#endif
if (!fgets(r->read_buffer, sizeof(r->read_buffer), fp))
return 1;
r->read_len = strlen(r->read_buffer);
return 0;
}
/* 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, int *pos) {
int start = *pos, scan = *pos;
if (scan >= r->read_len) {
r->read_len = 0;
return NULL;
}
while (scan < r->read_len && r->read_buffer[scan] != '\n')
scan++;
if (scan < r->read_len && r->read_buffer[scan] == '\n') {
*pos = scan+1;
r->read_buffer[scan] = 0;
return &r->read_buffer[start];
}
memcpy(r->read_buffer, &r->read_buffer[start], r->read_len - start);
r->read_len -= start;
return NULL;
}
size_t streaming_parser(struct receiver_state *rpt, struct plugind *cd, FILE *fp) {
size_t result;
PARSER_USER_OBJECT *user = callocz(1, sizeof(*user));
user->enabled = cd->enabled;
user->host = rpt->host;
user->opaque = rpt;
user->cd = cd;
user->trust_durations = 0;
PARSER *parser = parser_init(rpt->host, user, fp, PARSER_INPUT_SPLIT);
parser_add_keyword(parser, "TIMESTAMP", streaming_timestamp);
if (unlikely(!parser)) {
error("Failed to initialize parser");
cd->serial_failures++;
freez(user);
return 0;
}
parser->plugins_action->begin_action = &pluginsd_begin_action;
parser->plugins_action->flush_action = &pluginsd_flush_action;
parser->plugins_action->end_action = &pluginsd_end_action;
parser->plugins_action->disable_action = &pluginsd_disable_action;
parser->plugins_action->variable_action = &pluginsd_variable_action;
parser->plugins_action->dimension_action = &pluginsd_dimension_action;
parser->plugins_action->label_action = &pluginsd_label_action;
parser->plugins_action->overwrite_action = &pluginsd_overwrite_action;
parser->plugins_action->chart_action = &pluginsd_chart_action;
parser->plugins_action->set_action = &pluginsd_set_action;
user->parser = parser;
do {
if (receiver_read(rpt, fp))
break;
int pos = 0;
char *line;
while ((line = receiver_next_line(rpt, &pos))) {
if (unlikely(netdata_exit || rpt->shutdown || parser_action(parser, line)))
goto done;
}
rpt->last_msg_t = now_realtime_sec();
}
while(!netdata_exit);
done:
result= user->count;
freez(user);
parser_destroy(parser);
return result;
}
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;
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)));
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);
rpt->tags = (char*)appconfig_set_default(&stream_config, rpt->machine_guid, "host tags", (rpt->tags)?rpt->tags:"");
if(rpt->tags && !*rpt->tags) rpt->tags = NULL;
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 MASTER");
error("STREAM %s [receive from %s:%s]: denied to receive metrics, machine GUID [%s] is my own. Did you copy the master/proxy machine guid to a slave?", rpt->hostname, rpt->client_ip, rpt->client_port, rpt->machine_guid);
close(rpt->fd);
return 1;
}
if (rpt->host==NULL) {
rpt->host = rrdhost_find_or_create(
rpt->hostname
, rpt->registry_hostname
, rpt->machine_guid
, rpt->os
, rpt->timezone
, rpt->tags
, program_name
, 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
, rpt->system_info
);
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 rrdhost_update(rpt->host
, rpt->hostname
, rpt->registry_hostname
, rpt->machine_guid
, rpt->os
, rpt->timezone
, rpt->tags
, program_name
, 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
, rpt->system_info);
int ssl = 0;
#ifdef ENABLE_HTTPS
if (rpt->ssl.conn != NULL)
ssl = 1;
#endif
#ifdef NETDATA_INTERNAL_CHECKS
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
, rpt->host->hostname
, 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," : ""
, rpt->host->tags?rpt->host->tags:""
);
#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,
.version = 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);
info("STREAM %s [receive from [%s]:%s]: initializing communication...", rpt->host->hostname, rpt->client_ip, rpt->client_port);
char initial_response[HTTP_HEADER_SIZE];
if (rpt->stream_version > 1) {
info("STREAM %s [receive from [%s]:%s]: Netdata is using the stream version %u.", rpt->host->hostname, rpt->client_ip, rpt->client_port, rpt->stream_version);
sprintf(initial_response, "%s%u", START_STREAMING_PROMPT_VN, rpt->stream_version);
} else if (rpt->stream_version == 1) {
info("STREAM %s [receive from [%s]:%s]: Netdata is using the stream version %u.", rpt->host->hostname, rpt->client_ip, rpt->client_port, rpt->stream_version);
sprintf(initial_response, "%s", START_STREAMING_PROMPT_V2);
} else {
info("STREAM %s [receive from [%s]:%s]: Netdata is using first stream protocol.", rpt->host->hostname, rpt->client_ip, rpt->client_port);
sprintf(initial_response, "%s", START_STREAMING_PROMPT);
}
debug(D_STREAM, "Initial response to %s: %s", rpt->client_ip, initial_response);
#ifdef ENABLE_HTTPS
rpt->host->stream_ssl.conn = rpt->ssl.conn;
rpt->host->stream_ssl.flags = rpt->ssl.flags;
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, rpt->host->hostname, "FAILED - CANNOT REPLY");
error("STREAM %s [receive from [%s]:%s]: cannot send ready command.", rpt->host->hostname, 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", rpt->host->hostname, rpt->client_ip, rpt->client_port, rpt->fd);
// convert the socket to a FILE *
FILE *fp = fdopen(rpt->fd, "r");
if(!fp) {
log_stream_connection(rpt->client_ip, rpt->client_port, rpt->key, rpt->host->machine_guid, rpt->host->hostname, "FAILED - SOCKET ERROR");
error("STREAM %s [receive from [%s]:%s]: failed to get a FILE for FD %d.", rpt->host->hostname, rpt->client_ip, rpt->client_port, rpt->fd);
close(rpt->fd);
return 0;
}
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;
}
*/
rrdhost_flag_clear(rpt->host, RRDHOST_FLAG_ORPHAN);
// rpt->host->connected_senders++;
rpt->host->senders_disconnected_time = 0;
rpt->host->labels_flag = (rpt->stream_version > 0)?LABEL_FLAG_UPDATE_STREAM:LABEL_FLAG_STOP_STREAM;
if(health_enabled != CONFIG_BOOLEAN_NO) {
if(alarms_delay > 0) {
rpt->host->health_delay_up_to = now_realtime_sec() + alarms_delay;
info("Postponing health checks for %ld seconds, on host '%s', because it was just connected."
, alarms_delay
, rpt->host->hostname
);
}
}
rrdhost_unlock(rpt->host);
// call the plugins.d processor to receive the metrics
info("STREAM %s [receive from [%s]:%s]: receiving metrics...", rpt->host->hostname, rpt->client_ip, rpt->client_port);
log_stream_connection(rpt->client_ip, rpt->client_port, rpt->key, rpt->host->machine_guid, rpt->host->hostname, "CONNECTED");
cd.version = rpt->stream_version;
size_t count = streaming_parser(rpt, &cd, fp);
//size_t count = pluginsd_process(host, &cd, fp, 1);
log_stream_connection(rpt->client_ip, rpt->client_port, rpt->key, rpt->host->machine_guid, rpt->host->hostname, "DISCONNECTED");
error("STREAM %s [receive from [%s]:%s]: disconnected (completed %zu updates).", rpt->host->hostname, rpt->client_ip, rpt->client_port, count);
netdata_mutex_lock(&rpt->host->receiver_lock);
if (rpt->host->receiver == rpt) {
rrdhost_wrlock(rpt->host);
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);
rrdpush_sender_thread_stop(rpt->host);
}
netdata_mutex_unlock(&rpt->host->receiver_lock);
// cleanup
fclose(fp);
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());
rrdpush_receive(rpt);
netdata_thread_cleanup_pop(1);
return NULL;
}
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