src/aclk/aclk.c
// SPDX-License-Identifier: GPL-3.0-or-later
#include "aclk.h"
#ifdef ENABLE_ACLK
#include "aclk_stats.h"
#include "mqtt_websockets/mqtt_wss_client.h"
#include "aclk_otp.h"
#include "aclk_tx_msgs.h"
#include "aclk_query.h"
#include "aclk_query_queue.h"
#include "aclk_util.h"
#include "aclk_rx_msgs.h"
#include "https_client.h"
#include "schema-wrappers/schema_wrappers.h"
#include "aclk_capas.h"
#include "aclk_proxy.h"
#ifdef ACLK_LOG_CONVERSATION_DIR
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#endif
#define ACLK_STABLE_TIMEOUT 3 // Minimum delay to mark AGENT as stable
#endif /* ENABLE_ACLK */
int aclk_pubacks_per_conn = 0; // How many PubAcks we got since MQTT conn est.
int aclk_rcvd_cloud_msgs = 0;
int aclk_connection_counter = 0;
int disconnect_req = 0;
int aclk_connected = 0;
int aclk_ctx_based = 0;
int aclk_disable_runtime = 0;
int aclk_stats_enabled;
int aclk_kill_link = 0;
usec_t aclk_session_us = 0;
time_t aclk_session_sec = 0;
time_t last_conn_time_mqtt = 0;
time_t last_conn_time_appl = 0;
time_t last_disconnect_time = 0;
time_t next_connection_attempt = 0;
float last_backoff_value = 0;
time_t aclk_block_until = 0;
#ifdef ENABLE_ACLK
mqtt_wss_client mqttwss_client;
netdata_mutex_t aclk_shared_state_mutex = NETDATA_MUTEX_INITIALIZER;
#define ACLK_SHARED_STATE_LOCK netdata_mutex_lock(&aclk_shared_state_mutex)
#define ACLK_SHARED_STATE_UNLOCK netdata_mutex_unlock(&aclk_shared_state_mutex)
struct aclk_shared_state aclk_shared_state = {
.mqtt_shutdown_msg_id = -1,
.mqtt_shutdown_msg_rcvd = 0
};
#ifdef MQTT_WSS_DEBUG
#include <openssl/ssl.h>
#define DEFAULT_SSKEYLOGFILE_NAME "SSLKEYLOGFILE"
const char *ssl_log_filename = NULL;
FILE *ssl_log_file = NULL;
static void aclk_ssl_keylog_cb(const SSL *ssl, const char *line)
{
(void)ssl;
if (!ssl_log_file)
ssl_log_file = fopen(ssl_log_filename, "a");
if (!ssl_log_file) {
netdata_log_error("Couldn't open ssl_log file (%s) for append.", ssl_log_filename);
return;
}
fputs(line, ssl_log_file);
putc('\n', ssl_log_file);
fflush(ssl_log_file);
}
#endif
#if OPENSSL_VERSION_NUMBER >= OPENSSL_VERSION_300
OSSL_DECODER_CTX *aclk_dctx = NULL;
EVP_PKEY *aclk_private_key = NULL;
#else
static RSA *aclk_private_key = NULL;
#endif
static int load_private_key()
{
if (aclk_private_key != NULL) {
#if OPENSSL_VERSION_NUMBER >= OPENSSL_VERSION_300
EVP_PKEY_free(aclk_private_key);
if (aclk_dctx)
OSSL_DECODER_CTX_free(aclk_dctx);
aclk_dctx = NULL;
#else
RSA_free(aclk_private_key);
#endif
}
aclk_private_key = NULL;
char filename[FILENAME_MAX + 1];
snprintfz(filename, FILENAME_MAX, "%s/cloud.d/private.pem", netdata_configured_varlib_dir);
long bytes_read;
char *private_key = read_by_filename(filename, &bytes_read);
if (!private_key) {
netdata_log_error("Claimed agent cannot establish ACLK - unable to load private key '%s' failed.", filename);
return 1;
}
netdata_log_debug(D_ACLK, "Claimed agent loaded private key len=%ld bytes", bytes_read);
BIO *key_bio = BIO_new_mem_buf(private_key, -1);
if (key_bio==NULL) {
netdata_log_error("Claimed agent cannot establish ACLK - failed to create BIO for key");
goto biofailed;
}
#if OPENSSL_VERSION_NUMBER >= OPENSSL_VERSION_300
aclk_dctx = OSSL_DECODER_CTX_new_for_pkey(&aclk_private_key, "PEM", NULL,
"RSA",
OSSL_KEYMGMT_SELECT_PRIVATE_KEY,
NULL, NULL);
if (!aclk_dctx) {
netdata_log_error("Loading private key (from claiming) failed - no OpenSSL Decoders found");
goto biofailed;
}
// this is necesseary to avoid RSA key with wrong size
if (!OSSL_DECODER_from_bio(aclk_dctx, key_bio)) {
netdata_log_error("Decoding private key (from claiming) failed - invalid format.");
goto biofailed;
}
#else
aclk_private_key = PEM_read_bio_RSAPrivateKey(key_bio, NULL, NULL, NULL);
#endif
BIO_free(key_bio);
if (aclk_private_key!=NULL)
{
freez(private_key);
return 0;
}
char err[512];
ERR_error_string_n(ERR_get_error(), err, sizeof(err));
netdata_log_error("Claimed agent cannot establish ACLK - cannot create private key: %s", err);
biofailed:
freez(private_key);
return 1;
}
static int wait_till_cloud_enabled()
{
nd_log(NDLS_DAEMON, NDLP_INFO,
"Waiting for Cloud to be enabled");
while (!netdata_cloud_enabled) {
sleep_usec(USEC_PER_SEC * 1);
if (!service_running(SERVICE_ACLK))
return 1;
}
return 0;
}
/**
* Will block until agent is claimed. Returns only if agent claimed
* or if agent needs to shutdown.
*
* @return `0` if agent has been claimed,
* `1` if interrupted due to agent shutting down
*/
static int wait_till_agent_claimed(void)
{
//TODO prevent malloc and freez
char *agent_id = get_agent_claimid();
while (likely(!agent_id)) {
sleep_usec(USEC_PER_SEC * 1);
if (!service_running(SERVICE_ACLK))
return 1;
agent_id = get_agent_claimid();
}
freez(agent_id);
return 0;
}
/**
* Checks everything is ready for connection
* agent claimed, cloud url set and private key available
*
* @param aclk_hostname points to location where string pointer to hostname will be set
* @param aclk_port port to int where port will be saved
*
* @return If non 0 returned irrecoverable error happened (or netdata_exit) and ACLK should be terminated
*/
static int wait_till_agent_claim_ready()
{
url_t url;
while (service_running(SERVICE_ACLK)) {
if (wait_till_agent_claimed())
return 1;
// The NULL return means the value was never initialised, but this value has been initialized in post_conf_load.
// We trap the impossible NULL here to keep the linter happy without using a fatal() in the code.
char *cloud_base_url = appconfig_get(&cloud_config, CONFIG_SECTION_GLOBAL, "cloud base url", NULL);
if (cloud_base_url == NULL) {
netdata_log_error("Do not move the cloud base url out of post_conf_load!!");
return 1;
}
// We just check configuration is valid here
// TODO make it without malloc/free
memset(&url, 0, sizeof(url_t));
if (url_parse(cloud_base_url, &url)) {
netdata_log_error("Agent is claimed but the URL in configuration key \"cloud base url\" is invalid, please fix");
url_t_destroy(&url);
sleep(5);
continue;
}
url_t_destroy(&url);
if (!load_private_key())
return 0;
sleep(5);
}
return 1;
}
void aclk_mqtt_wss_log_cb(mqtt_wss_log_type_t log_type, const char* str)
{
switch(log_type) {
case MQTT_WSS_LOG_ERROR:
case MQTT_WSS_LOG_FATAL:
nd_log(NDLS_DAEMON, NDLP_ERR, "%s", str);
return;
case MQTT_WSS_LOG_WARN:
nd_log(NDLS_DAEMON, NDLP_WARNING, "%s", str);
return;
case MQTT_WSS_LOG_INFO:
nd_log(NDLS_DAEMON, NDLP_INFO, "%s", str);
return;
case MQTT_WSS_LOG_DEBUG:
return;
default:
nd_log(NDLS_DAEMON, NDLP_ERR, "Unknown log type from mqtt_wss");
}
}
static void msg_callback(const char *topic, const void *msg, size_t msglen, int qos)
{
UNUSED(qos);
aclk_rcvd_cloud_msgs++;
netdata_log_debug(D_ACLK, "Got Message From Broker Topic \"%s\" QOS %d", topic, qos);
if (aclk_shared_state.mqtt_shutdown_msg_id > 0) {
netdata_log_error("Link is shutting down. Ignoring incoming message.");
return;
}
const char *msgtype = strrchr(topic, '/');
if (unlikely(!msgtype)) {
error_report("Cannot get message type from topic. Ignoring message from topic \"%s\"", topic);
return;
}
msgtype++;
if (unlikely(!*msgtype)) {
error_report("Message type empty. Ignoring message from topic \"%s\"", topic);
return;
}
#ifdef ACLK_LOG_CONVERSATION_DIR
#define FN_MAX_LEN 512
char filename[FN_MAX_LEN];
int logfd;
snprintf(filename, FN_MAX_LEN, ACLK_LOG_CONVERSATION_DIR "/%010d-rx-%s.bin", ACLK_GET_CONV_LOG_NEXT(), msgtype);
logfd = open(filename, O_CREAT | O_TRUNC | O_WRONLY, S_IRUSR | S_IWUSR );
if(logfd < 0)
netdata_log_error("Error opening ACLK Conversation logfile \"%s\" for RX message.", filename);
write(logfd, msg, msglen);
close(logfd);
#endif
aclk_handle_new_cloud_msg(msgtype, msg, msglen, topic);
}
static void puback_callback(uint16_t packet_id)
{
if (++aclk_pubacks_per_conn == ACLK_PUBACKS_CONN_STABLE) {
last_conn_time_appl = now_realtime_sec();
aclk_tbeb_reset();
}
#ifdef NETDATA_INTERNAL_CHECKS
aclk_stats_msg_puback(packet_id);
#endif
if (aclk_shared_state.mqtt_shutdown_msg_id == (int)packet_id) {
nd_log(NDLS_DAEMON, NDLP_DEBUG,
"Shutdown message has been acknowledged by the cloud. Exiting gracefully");
aclk_shared_state.mqtt_shutdown_msg_rcvd = 1;
}
}
static int read_query_thread_count()
{
int threads = MIN(get_netdata_cpus()/2, 6);
threads = MAX(threads, 2);
threads = config_get_number(CONFIG_SECTION_CLOUD, "query thread count", threads);
if(threads < 1) {
netdata_log_error("You need at least one query thread. Overriding configured setting of \"%d\"", threads);
threads = 1;
config_set_number(CONFIG_SECTION_CLOUD, "query thread count", threads);
}
return threads;
}
void aclk_graceful_disconnect(mqtt_wss_client client);
/* Keeps connection alive and handles all network communications.
* Returns on error or when netdata is shutting down.
* @param client instance of mqtt_wss_client
* @returns 0 - Netdata Exits
* >0 - Error happened. Reconnect and start over.
*/
static int handle_connection(mqtt_wss_client client)
{
time_t last_periodic_query_wakeup = now_monotonic_sec();
while (service_running(SERVICE_ACLK)) {
// timeout 1000 to check at least once a second
// for netdata_exit
if (mqtt_wss_service(client, 1000) < 0){
error_report("Connection Error or Dropped");
return 1;
}
if (disconnect_req || aclk_kill_link) {
nd_log(NDLS_DAEMON, NDLP_NOTICE,
"Going to restart connection due to disconnect_req=%s (cloud req), aclk_kill_link=%s (reclaim)",
disconnect_req ? "true" : "false",
aclk_kill_link ? "true" : "false");
disconnect_req = 0;
aclk_kill_link = 0;
aclk_graceful_disconnect(client);
aclk_queue_unlock();
aclk_shared_state.mqtt_shutdown_msg_id = -1;
aclk_shared_state.mqtt_shutdown_msg_rcvd = 0;
return 1;
}
// mqtt_wss_service will return faster than in one second
// if there is enough work to do
time_t now = now_monotonic_sec();
if (last_periodic_query_wakeup < now) {
// wake up at least one Query Thread at least
// once per second
last_periodic_query_wakeup = now;
QUERY_THREAD_WAKEUP;
}
}
return 0;
}
static inline void mqtt_connected_actions(mqtt_wss_client client)
{
char *topic = (char*)aclk_get_topic(ACLK_TOPICID_COMMAND);
if (!topic)
netdata_log_error("Unable to fetch topic for COMMAND (to subscribe)");
else
mqtt_wss_subscribe(client, topic, 1);
topic = (char*)aclk_get_topic(ACLK_TOPICID_CMD_NG_V1);
if (!topic)
netdata_log_error("Unable to fetch topic for protobuf COMMAND (to subscribe)");
else
mqtt_wss_subscribe(client, topic, 1);
aclk_stats_upd_online(1);
aclk_connected = 1;
aclk_pubacks_per_conn = 0;
aclk_rcvd_cloud_msgs = 0;
aclk_connection_counter++;
aclk_topic_cache_iter_t iter = ACLK_TOPIC_CACHE_ITER_T_INITIALIZER;
while ((topic = (char*)aclk_topic_cache_iterate(&iter)) != NULL)
mqtt_wss_set_topic_alias(client, topic);
aclk_send_agent_connection_update(client, 1);
}
void aclk_graceful_disconnect(mqtt_wss_client client)
{
nd_log(NDLS_DAEMON, NDLP_DEBUG,
"Preparing to gracefully shutdown ACLK connection");
aclk_queue_lock();
aclk_queue_flush();
aclk_shared_state.mqtt_shutdown_msg_id = aclk_send_agent_connection_update(client, 0);
time_t t = now_monotonic_sec();
while (!mqtt_wss_service(client, 100)) {
if (now_monotonic_sec() - t >= 2) {
netdata_log_error("Wasn't able to gracefully shutdown ACLK in time!");
break;
}
if (aclk_shared_state.mqtt_shutdown_msg_rcvd) {
nd_log(NDLS_DAEMON, NDLP_DEBUG,
"MQTT App Layer `disconnect` message sent successfully");
break;
}
}
nd_log(NDLS_DAEMON, NDLP_WARNING, "ACLK link is down");
nd_log(NDLS_ACCESS, NDLP_WARNING, "ACLK DISCONNECTED");
aclk_stats_upd_online(0);
last_disconnect_time = now_realtime_sec();
aclk_connected = 0;
nd_log(NDLS_DAEMON, NDLP_DEBUG,
"Attempting to gracefully shutdown the MQTT/WSS connection");
mqtt_wss_disconnect(client, 1000);
}
static unsigned long aclk_reconnect_delay() {
unsigned long recon_delay;
time_t now;
if (aclk_disable_runtime) {
aclk_tbeb_reset();
return 60 * MSEC_PER_SEC;
}
now = now_monotonic_sec();
if (aclk_block_until) {
if (now < aclk_block_until) {
recon_delay = aclk_block_until - now;
recon_delay *= MSEC_PER_SEC;
aclk_block_until = 0;
aclk_tbeb_reset();
return recon_delay;
}
aclk_block_until = 0;
}
if (!aclk_env || !aclk_env->backoff.base)
return aclk_tbeb_delay(0, 2, 0, 1024);
return aclk_tbeb_delay(0, aclk_env->backoff.base, aclk_env->backoff.min_s, aclk_env->backoff.max_s);
}
/* Block till aclk_reconnect_delay is satisfied or netdata_exit is signalled
* @return 0 - Go ahead and connect (delay expired)
* 1 - netdata_exit
*/
#define NETDATA_EXIT_POLL_MS (MSEC_PER_SEC/4)
static int aclk_block_till_recon_allowed() {
unsigned long recon_delay = aclk_reconnect_delay();
next_connection_attempt = now_realtime_sec() + (recon_delay / MSEC_PER_SEC);
last_backoff_value = (float)recon_delay / MSEC_PER_SEC;
nd_log(NDLS_DAEMON, NDLP_DEBUG,
"Wait before attempting to reconnect in %.3f seconds", recon_delay / (float)MSEC_PER_SEC);
// we want to wake up from time to time to check netdata_exit
while (recon_delay)
{
if (!service_running(SERVICE_ACLK))
return 1;
if (recon_delay > NETDATA_EXIT_POLL_MS) {
sleep_usec(NETDATA_EXIT_POLL_MS * USEC_PER_MS);
recon_delay -= NETDATA_EXIT_POLL_MS;
continue;
}
sleep_usec(recon_delay * USEC_PER_MS);
recon_delay = 0;
}
return !service_running(SERVICE_ACLK);
}
#ifndef ACLK_DISABLE_CHALLENGE
/* Cloud returns transport list ordered with highest
* priority first. This function selects highest prio
* transport that we can actually use (support)
*/
static int aclk_get_transport_idx(aclk_env_t *env) {
for (size_t i = 0; i < env->transport_count; i++) {
// currently we support only MQTT 5
// therefore select first transport that matches
if (env->transports[i]->type == ACLK_TRP_MQTT_5) {
return i;
}
}
return -1;
}
#endif
ACLK_STATUS aclk_status = ACLK_STATUS_NONE;
const char *aclk_status_to_string(void) {
switch(aclk_status) {
case ACLK_STATUS_CONNECTED:
return "connected";
case ACLK_STATUS_NONE:
return "none";
case ACLK_STATUS_DISABLED:
return "disabled";
case ACLK_STATUS_NO_CLOUD_URL:
return "no_cloud_url";
case ACLK_STATUS_INVALID_CLOUD_URL:
return "invalid_cloud_url";
case ACLK_STATUS_NOT_CLAIMED:
return "not_claimed";
case ACLK_STATUS_ENV_ENDPOINT_UNREACHABLE:
return "env_endpoint_unreachable";
case ACLK_STATUS_ENV_RESPONSE_NOT_200:
return "env_response_not_200";
case ACLK_STATUS_ENV_RESPONSE_EMPTY:
return "env_response_empty";
case ACLK_STATUS_ENV_RESPONSE_NOT_JSON:
return "env_response_not_json";
case ACLK_STATUS_ENV_FAILED:
return "env_failed";
case ACLK_STATUS_BLOCKED:
return "blocked";
case ACLK_STATUS_NO_OLD_PROTOCOL:
return "no_old_protocol";
case ACLK_STATUS_NO_PROTOCOL_CAPABILITY:
return "no_protocol_capability";
case ACLK_STATUS_INVALID_ENV_AUTH_URL:
return "invalid_env_auth_url";
case ACLK_STATUS_INVALID_ENV_TRANSPORT_IDX:
return "invalid_env_transport_idx";
case ACLK_STATUS_INVALID_ENV_TRANSPORT_URL:
return "invalid_env_transport_url";
case ACLK_STATUS_INVALID_OTP:
return "invalid_otp";
case ACLK_STATUS_NO_LWT_TOPIC:
return "no_lwt_topic";
default:
return "unknown";
}
}
const char *aclk_cloud_base_url = NULL;
/* Attempts to make a connection to MQTT broker over WSS
* @param client instance of mqtt_wss_client
* @return 0 - Successful Connection,
* <0 - Irrecoverable Error -> Kill ACLK,
* >0 - netdata_exit
*/
#define CLOUD_BASE_URL_READ_RETRY 30
#ifdef ACLK_SSL_ALLOW_SELF_SIGNED
#define ACLK_SSL_FLAGS MQTT_WSS_SSL_ALLOW_SELF_SIGNED
#else
#define ACLK_SSL_FLAGS MQTT_WSS_SSL_CERT_CHECK_FULL
#endif
static int aclk_attempt_to_connect(mqtt_wss_client client)
{
int ret;
url_t base_url;
#ifndef ACLK_DISABLE_CHALLENGE
url_t auth_url;
url_t mqtt_url;
#endif
while (service_running(SERVICE_ACLK)) {
aclk_cloud_base_url = appconfig_get(&cloud_config, CONFIG_SECTION_GLOBAL, "cloud base url", NULL);
if (aclk_cloud_base_url == NULL) {
error_report("Do not move the cloud base url out of post_conf_load!!");
aclk_status = ACLK_STATUS_NO_CLOUD_URL;
return -1;
}
if (aclk_block_till_recon_allowed()) {
aclk_status = ACLK_STATUS_BLOCKED;
return 1;
}
nd_log(NDLS_DAEMON, NDLP_DEBUG,
"Attempting connection now");
memset(&base_url, 0, sizeof(url_t));
if (url_parse(aclk_cloud_base_url, &base_url)) {
aclk_status = ACLK_STATUS_INVALID_CLOUD_URL;
error_report("ACLK base URL configuration key could not be parsed. Will retry in %d seconds.", CLOUD_BASE_URL_READ_RETRY);
sleep(CLOUD_BASE_URL_READ_RETRY);
url_t_destroy(&base_url);
continue;
}
struct mqtt_wss_proxy proxy_conf = { .host = NULL, .port = 0, .username = NULL, .password = NULL, .type = MQTT_WSS_DIRECT };
aclk_set_proxy((char**)&proxy_conf.host, &proxy_conf.port, (char**)&proxy_conf.username, (char**)&proxy_conf.password, &proxy_conf.type);
struct mqtt_connect_params mqtt_conn_params = {
.clientid = "anon",
.username = "anon",
.password = "anon",
.will_topic = "lwt",
.will_msg = NULL,
.will_flags = MQTT_WSS_PUB_QOS2,
.keep_alive = 60,
.drop_on_publish_fail = 1
};
#ifndef ACLK_DISABLE_CHALLENGE
if (aclk_env) {
aclk_env_t_destroy(aclk_env);
freez(aclk_env);
}
aclk_env = callocz(1, sizeof(aclk_env_t));
ret = aclk_get_env(aclk_env, base_url.host, base_url.port);
url_t_destroy(&base_url);
if(ret) switch(ret) {
case 1:
aclk_status = ACLK_STATUS_NOT_CLAIMED;
error_report("Failed to Get ACLK environment (agent is not claimed)");
// delay handled by aclk_block_till_recon_allowed
continue;
case 2:
aclk_status = ACLK_STATUS_ENV_ENDPOINT_UNREACHABLE;
error_report("Failed to Get ACLK environment (cannot contact ENV endpoint)");
// delay handled by aclk_block_till_recon_allowed
continue;
case 3:
aclk_status = ACLK_STATUS_ENV_RESPONSE_NOT_200;
error_report("Failed to Get ACLK environment (ENV response code is not 200)");
// delay handled by aclk_block_till_recon_allowed
continue;
case 4:
aclk_status = ACLK_STATUS_ENV_RESPONSE_EMPTY;
error_report("Failed to Get ACLK environment (ENV response is empty)");
// delay handled by aclk_block_till_recon_allowed
continue;
case 5:
aclk_status = ACLK_STATUS_ENV_RESPONSE_NOT_JSON;
error_report("Failed to Get ACLK environment (ENV response is not JSON)");
// delay handled by aclk_block_till_recon_allowed
continue;
default:
aclk_status = ACLK_STATUS_ENV_FAILED;
error_report("Failed to Get ACLK environment (unknown error)");
// delay handled by aclk_block_till_recon_allowed
continue;
}
if (!service_running(SERVICE_ACLK)) {
aclk_status = ACLK_STATUS_DISABLED;
return 1;
}
if (aclk_env->encoding != ACLK_ENC_PROTO) {
aclk_status = ACLK_STATUS_NO_OLD_PROTOCOL;
error_report("This agent can only use the new cloud protocol but cloud requested old one.");
continue;
}
if (!aclk_env_has_capa("proto")) {
aclk_status = ACLK_STATUS_NO_PROTOCOL_CAPABILITY;
error_report("Can't use encoding=proto without at least \"proto\" capability.");
continue;
}
nd_log(NDLS_DAEMON, NDLP_DEBUG,
"New ACLK protobuf protocol negotiated successfully (/env response).");
memset(&auth_url, 0, sizeof(url_t));
if (url_parse(aclk_env->auth_endpoint, &auth_url)) {
aclk_status = ACLK_STATUS_INVALID_ENV_AUTH_URL;
error_report("Parsing URL returned by env endpoint for authentication failed. \"%s\"", aclk_env->auth_endpoint);
url_t_destroy(&auth_url);
continue;
}
ret = aclk_get_mqtt_otp(aclk_private_key, (char **)&mqtt_conn_params.clientid, (char **)&mqtt_conn_params.username, (char **)&mqtt_conn_params.password, &auth_url);
url_t_destroy(&auth_url);
if (ret) {
aclk_status = ACLK_STATUS_INVALID_OTP;
error_report("Error passing Challenge/Response to get OTP");
continue;
}
// aclk_get_topic moved here as during OTP we
// generate the topic cache
mqtt_conn_params.will_topic = aclk_get_topic(ACLK_TOPICID_AGENT_CONN);
if (!mqtt_conn_params.will_topic) {
aclk_status = ACLK_STATUS_NO_LWT_TOPIC;
error_report("Couldn't get LWT topic. Will not send LWT.");
continue;
}
// Do the MQTT connection
ret = aclk_get_transport_idx(aclk_env);
if (ret < 0) {
aclk_status = ACLK_STATUS_INVALID_ENV_TRANSPORT_IDX;
error_report("Cloud /env endpoint didn't return any transport usable by this Agent.");
continue;
}
memset(&mqtt_url, 0, sizeof(url_t));
if (url_parse(aclk_env->transports[ret]->endpoint, &mqtt_url)){
aclk_status = ACLK_STATUS_INVALID_ENV_TRANSPORT_URL;
error_report("Failed to parse target URL for /env trp idx %d \"%s\"", ret, aclk_env->transports[ret]->endpoint);
url_t_destroy(&mqtt_url);
continue;
}
#endif
aclk_session_newarch = now_realtime_usec();
aclk_session_sec = aclk_session_newarch / USEC_PER_SEC;
aclk_session_us = aclk_session_newarch % USEC_PER_SEC;
mqtt_conn_params.will_msg = aclk_generate_lwt(&mqtt_conn_params.will_msg_len);
#ifdef ACLK_DISABLE_CHALLENGE
ret = mqtt_wss_connect(client, base_url.host, base_url.port, &mqtt_conn_params, ACLK_SSL_FLAGS, &proxy_conf);
url_t_destroy(&base_url);
#else
ret = mqtt_wss_connect(client, mqtt_url.host, mqtt_url.port, &mqtt_conn_params, ACLK_SSL_FLAGS, &proxy_conf);
url_t_destroy(&mqtt_url);
freez((char*)mqtt_conn_params.clientid);
freez((char*)mqtt_conn_params.password);
freez((char*)mqtt_conn_params.username);
#endif
freez((char*)mqtt_conn_params.will_msg);
freez((char*)proxy_conf.host);
freez((char*)proxy_conf.username);
freez((char*)proxy_conf.password);
if (!ret) {
last_conn_time_mqtt = now_realtime_sec();
nd_log(NDLS_DAEMON, NDLP_INFO, "ACLK connection successfully established");
aclk_status = ACLK_STATUS_CONNECTED;
nd_log(NDLS_ACCESS, NDLP_INFO, "ACLK CONNECTED");
mqtt_connected_actions(client);
return 0;
}
error_report("Connect failed");
}
aclk_status = ACLK_STATUS_DISABLED;
return 1;
}
/**
* Main agent cloud link thread
*
* This thread will simply call the main event loop that handles
* pending requests - both inbound and outbound
*
* @param ptr is a pointer to the netdata_static_thread structure.
*
* @return It always returns NULL
*/
void *aclk_main(void *ptr)
{
struct netdata_static_thread *static_thread = (struct netdata_static_thread *)ptr;
struct aclk_stats_thread *stats_thread = NULL;
struct aclk_query_threads query_threads;
query_threads.thread_list = NULL;
ACLK_PROXY_TYPE proxy_type;
aclk_get_proxy(&proxy_type);
if (proxy_type == PROXY_TYPE_SOCKS5) {
netdata_log_error("SOCKS5 proxy is not supported by ACLK-NG yet.");
static_thread->enabled = NETDATA_MAIN_THREAD_EXITED;
return NULL;
}
unsigned int proto_hdl_cnt = aclk_init_rx_msg_handlers();
#if defined( DISABLE_CLOUD ) || !defined( ENABLE_ACLK )
nd_log(NDLS_DAEMON, NDLP_INFO,
"Killing ACLK thread -> cloud functionality has been disabled");
static_thread->enabled = NETDATA_MAIN_THREAD_EXITED;
return NULL;
#endif
query_threads.count = read_query_thread_count();
if (wait_till_cloud_enabled())
goto exit;
if (wait_till_agent_claim_ready())
goto exit;
if (!(mqttwss_client = mqtt_wss_new("mqtt_wss", aclk_mqtt_wss_log_cb, msg_callback, puback_callback))) {
netdata_log_error("Couldn't initialize MQTT_WSS network library");
goto exit;
}
#ifdef MQTT_WSS_DEBUG
size_t default_ssl_log_filename_size = strlen(netdata_configured_log_dir) + strlen(DEFAULT_SSKEYLOGFILE_NAME) + 2;
char *default_ssl_log_filename = mallocz(default_ssl_log_filename_size);
snprintfz(default_ssl_log_filename, default_ssl_log_filename_size, "%s/%s", netdata_configured_log_dir, DEFAULT_SSKEYLOGFILE_NAME);
ssl_log_filename = config_get(CONFIG_SECTION_CLOUD, "aclk ssl keylog file", default_ssl_log_filename);
freez(default_ssl_log_filename);
if (ssl_log_filename) {
error_report("SSLKEYLOGFILE active (path:\"%s\")!", ssl_log_filename);
mqtt_wss_set_SSL_CTX_keylog_cb(mqttwss_client, aclk_ssl_keylog_cb);
}
#endif
// Enable MQTT buffer growth if necessary
// e.g. old cloud architecture clients with huge nodes
// that send JSON payloads of 10 MB as single messages
mqtt_wss_set_max_buf_size(mqttwss_client, 25*1024*1024);
aclk_stats_enabled = config_get_boolean(CONFIG_SECTION_CLOUD, "statistics", global_statistics_enabled);
if (aclk_stats_enabled) {
stats_thread = callocz(1, sizeof(struct aclk_stats_thread));
stats_thread->query_thread_count = query_threads.count;
stats_thread->client = mqttwss_client;
aclk_stats_thread_prepare(query_threads.count, proto_hdl_cnt);
stats_thread->thread = nd_thread_create("ACLK_STATS", NETDATA_THREAD_OPTION_JOINABLE, aclk_stats_main_thread, stats_thread);
}
// Keep reconnecting and talking until our time has come
// and the Grim Reaper (netdata_exit) calls
do {
if (aclk_attempt_to_connect(mqttwss_client))
goto exit_full;
if (unlikely(!query_threads.thread_list))
aclk_query_threads_start(&query_threads, mqttwss_client);
if (handle_connection(mqttwss_client)) {
aclk_stats_upd_online(0);
last_disconnect_time = now_realtime_sec();
aclk_connected = 0;
nd_log(NDLS_ACCESS, NDLP_WARNING, "ACLK DISCONNECTED");
}
} while (service_running(SERVICE_ACLK));
aclk_graceful_disconnect(mqttwss_client);
#ifdef MQTT_WSS_DEBUG
if (ssl_log_file)
fclose(ssl_log_file);
#endif
exit_full:
// Tear Down
QUERY_THREAD_WAKEUP_ALL;
aclk_query_threads_cleanup(&query_threads);
if (aclk_stats_enabled) {
nd_thread_join(stats_thread->thread);
aclk_stats_thread_cleanup();
freez(stats_thread);
}
free_topic_cache();
mqtt_wss_destroy(mqttwss_client);
exit:
if (aclk_env) {
aclk_env_t_destroy(aclk_env);
freez(aclk_env);
}
static_thread->enabled = NETDATA_MAIN_THREAD_EXITED;
return NULL;
}
void aclk_host_state_update(RRDHOST *host, int cmd, int queryable)
{
nd_uuid_t node_id;
int ret = 0;
if (!aclk_connected)
return;
if (host->node_id && !uuid_is_null(*host->node_id)) {
uuid_copy(node_id, *host->node_id);
}
else {
ret = get_node_id(&host->host_uuid, &node_id);
if (ret > 0) {
// this means we were not able to check if node_id already present
netdata_log_error("Unable to check for node_id. Ignoring the host state update.");
return;
}
if (ret < 0) {
// node_id not found
aclk_query_t create_query;
create_query = aclk_query_new(REGISTER_NODE);
rrdhost_aclk_state_lock(localhost);
node_instance_creation_t node_instance_creation = {
.claim_id = localhost->aclk_state.claimed_id,
.hops = host->system_info->hops,
.hostname = rrdhost_hostname(host),
.machine_guid = host->machine_guid};
create_query->data.bin_payload.payload =
generate_node_instance_creation(&create_query->data.bin_payload.size, &node_instance_creation);
rrdhost_aclk_state_unlock(localhost);
create_query->data.bin_payload.topic = ACLK_TOPICID_CREATE_NODE;
create_query->data.bin_payload.msg_name = "CreateNodeInstance";
nd_log(NDLS_DAEMON, NDLP_DEBUG,
"Registering host=%s, hops=%u", host->machine_guid, host->system_info->hops);
aclk_queue_query(create_query);
return;
}
}
aclk_query_t query = aclk_query_new(NODE_STATE_UPDATE);
node_instance_connection_t node_state_update = {
.hops = host->system_info->hops,
.live = cmd,
.queryable = queryable,
.session_id = aclk_session_newarch
};
node_state_update.node_id = mallocz(UUID_STR_LEN);
uuid_unparse_lower(node_id, (char*)node_state_update.node_id);
node_state_update.capabilities = aclk_get_agent_capas();
rrdhost_aclk_state_lock(localhost);
node_state_update.claim_id = localhost->aclk_state.claimed_id;
query->data.bin_payload.payload = generate_node_instance_connection(&query->data.bin_payload.size, &node_state_update);
rrdhost_aclk_state_unlock(localhost);
nd_log(NDLS_DAEMON, NDLP_DEBUG,
"Queuing status update for node=%s, live=%d, hops=%u, queryable=%d",
(char*)node_state_update.node_id, cmd, host->system_info->hops, queryable);
freez((void*)node_state_update.node_id);
query->data.bin_payload.msg_name = "UpdateNodeInstanceConnection";
query->data.bin_payload.topic = ACLK_TOPICID_NODE_CONN;
aclk_queue_query(query);
}
void aclk_send_node_instances()
{
struct node_instance_list *list_head = get_node_list();
struct node_instance_list *list = list_head;
if (unlikely(!list)) {
error_report("Failure to get_node_list from DB!");
return;
}
while (!uuid_is_null(list->host_id)) {
if (!uuid_is_null(list->node_id)) {
aclk_query_t query = aclk_query_new(NODE_STATE_UPDATE);
node_instance_connection_t node_state_update = {
.live = list->live,
.hops = list->hops,
.queryable = 1,
.session_id = aclk_session_newarch
};
node_state_update.node_id = mallocz(UUID_STR_LEN);
uuid_unparse_lower(list->node_id, (char*)node_state_update.node_id);
char host_id[UUID_STR_LEN];
uuid_unparse_lower(list->host_id, host_id);
RRDHOST *host = rrdhost_find_by_guid(host_id);
if (unlikely(!host)) {
freez((void*)node_state_update.node_id);
freez(query);
continue;
}
node_state_update.capabilities = aclk_get_node_instance_capas(host);
rrdhost_aclk_state_lock(localhost);
node_state_update.claim_id = localhost->aclk_state.claimed_id;
query->data.bin_payload.payload = generate_node_instance_connection(&query->data.bin_payload.size, &node_state_update);
rrdhost_aclk_state_unlock(localhost);
nd_log(NDLS_DAEMON, NDLP_DEBUG,
"Queuing status update for node=%s, live=%d, hops=%d, queryable=1",
(char*)node_state_update.node_id, list->live, list->hops);
freez((void*)node_state_update.capabilities);
freez((void*)node_state_update.node_id);
query->data.bin_payload.msg_name = "UpdateNodeInstanceConnection";
query->data.bin_payload.topic = ACLK_TOPICID_NODE_CONN;
aclk_queue_query(query);
} else {
aclk_query_t create_query;
create_query = aclk_query_new(REGISTER_NODE);
node_instance_creation_t node_instance_creation = {
.hops = list->hops,
.hostname = list->hostname,
};
node_instance_creation.machine_guid = mallocz(UUID_STR_LEN);
uuid_unparse_lower(list->host_id, (char*)node_instance_creation.machine_guid);
create_query->data.bin_payload.topic = ACLK_TOPICID_CREATE_NODE;
create_query->data.bin_payload.msg_name = "CreateNodeInstance";
rrdhost_aclk_state_lock(localhost);
node_instance_creation.claim_id = localhost->aclk_state.claimed_id,
create_query->data.bin_payload.payload = generate_node_instance_creation(&create_query->data.bin_payload.size, &node_instance_creation);
rrdhost_aclk_state_unlock(localhost);
nd_log(NDLS_DAEMON, NDLP_DEBUG,
"Queuing registration for host=%s, hops=%d",
(char*)node_instance_creation.machine_guid, list->hops);
freez((void *)node_instance_creation.machine_guid);
aclk_queue_query(create_query);
}
freez(list->hostname);
list++;
}
freez(list_head);
}
void aclk_send_bin_msg(char *msg, size_t msg_len, enum aclk_topics subtopic, const char *msgname)
{
aclk_send_bin_message_subtopic_pid(mqttwss_client, msg, msg_len, subtopic, msgname);
}
static void fill_alert_status_for_host(BUFFER *wb, RRDHOST *host)
{
struct proto_alert_status status;
memset(&status, 0, sizeof(status));
if (get_proto_alert_status(host, &status)) {
buffer_strcat(wb, "\nFailed to get alert streaming status for this host");
return;
}
buffer_sprintf(wb,
"\n\t\tUpdates: %d"
"\n\t\tPending Min Seq ID: %"PRIu64
"\n\t\tPending Max Seq ID: %"PRIu64
"\n\t\tLast Submitted Seq ID: %"PRIu64,
status.alert_updates,
status.pending_min_sequence_id,
status.pending_max_sequence_id,
status.last_submitted_sequence_id
);
}
#endif /* ENABLE_ACLK */
char *aclk_state(void)
{
#ifndef ENABLE_ACLK
return strdupz("ACLK Available: No");
#else
BUFFER *wb = buffer_create(1024, &netdata_buffers_statistics.buffers_aclk);
struct tm *tmptr, tmbuf;
char *ret;
buffer_strcat(wb,
"ACLK Available: Yes\n"
"ACLK Version: 2\n"
"Protocols Supported: Protobuf\n"
);
buffer_sprintf(wb, "Protocol Used: Protobuf\nMQTT Version: %d\nClaimed: ", 5);
char *agent_id = get_agent_claimid();
if (agent_id == NULL)
buffer_strcat(wb, "No\n");
else {
char *cloud_base_url = appconfig_get(&cloud_config, CONFIG_SECTION_GLOBAL, "cloud base url", NULL);
buffer_sprintf(wb, "Yes\nClaimed Id: %s\nCloud URL: %s\n", agent_id, cloud_base_url ? cloud_base_url : "null");
freez(agent_id);
}
buffer_sprintf(wb, "Online: %s\nReconnect count: %d\nBanned By Cloud: %s\n", aclk_connected ? "Yes" : "No", aclk_connection_counter > 0 ? (aclk_connection_counter - 1) : 0, aclk_disable_runtime ? "Yes" : "No");
if (last_conn_time_mqtt && (tmptr = localtime_r(&last_conn_time_mqtt, &tmbuf)) ) {
char timebuf[26];
strftime(timebuf, 26, "%Y-%m-%d %H:%M:%S", tmptr);
buffer_sprintf(wb, "Last Connection Time: %s\n", timebuf);
}
if (last_conn_time_appl && (tmptr = localtime_r(&last_conn_time_appl, &tmbuf)) ) {
char timebuf[26];
strftime(timebuf, 26, "%Y-%m-%d %H:%M:%S", tmptr);
buffer_sprintf(wb, "Last Connection Time + %d PUBACKs received: %s\n", ACLK_PUBACKS_CONN_STABLE, timebuf);
}
if (last_disconnect_time && (tmptr = localtime_r(&last_disconnect_time, &tmbuf)) ) {
char timebuf[26];
strftime(timebuf, 26, "%Y-%m-%d %H:%M:%S", tmptr);
buffer_sprintf(wb, "Last Disconnect Time: %s\n", timebuf);
}
if (!aclk_connected && next_connection_attempt && (tmptr = localtime_r(&next_connection_attempt, &tmbuf)) ) {
char timebuf[26];
strftime(timebuf, 26, "%Y-%m-%d %H:%M:%S", tmptr);
buffer_sprintf(wb, "Next Connection Attempt At: %s\nLast Backoff: %.3f", timebuf, last_backoff_value);
}
if (aclk_connected) {
buffer_sprintf(wb, "Received Cloud MQTT Messages: %d\nMQTT Messages Confirmed by Remote Broker (PUBACKs): %d", aclk_rcvd_cloud_msgs, aclk_pubacks_per_conn);
RRDHOST *host;
rrd_rdlock();
rrdhost_foreach_read(host) {
buffer_sprintf(wb, "\n\n> Node Instance for mGUID: \"%s\" hostname \"%s\"\n", host->machine_guid, rrdhost_hostname(host));
buffer_strcat(wb, "\tClaimed ID: ");
rrdhost_aclk_state_lock(host);
if (host->aclk_state.claimed_id)
buffer_strcat(wb, host->aclk_state.claimed_id);
else
buffer_strcat(wb, "null");
rrdhost_aclk_state_unlock(host);
if (host->node_id == NULL || uuid_is_null(*host->node_id)) {
buffer_strcat(wb, "\n\tNode ID: null\n");
} else {
char node_id[GUID_LEN + 1];
uuid_unparse_lower(*host->node_id, node_id);
buffer_sprintf(wb, "\n\tNode ID: %s\n", node_id);
}
buffer_sprintf(wb, "\tStreaming Hops: %d\n\tRelationship: %s", host->system_info->hops, host == localhost ? "self" : "child");
if (host != localhost)
buffer_sprintf(wb, "\n\tStreaming Connection Live: %s", host->receiver ? "true" : "false");
buffer_strcat(wb, "\n\tAlert Streaming Status:");
fill_alert_status_for_host(wb, host);
}
rrd_rdunlock();
}
ret = strdupz(buffer_tostring(wb));
buffer_free(wb);
return ret;
#endif /* ENABLE_ACLK */
}
#ifdef ENABLE_ACLK
static void fill_alert_status_for_host_json(json_object *obj, RRDHOST *host)
{
struct proto_alert_status status;
memset(&status, 0, sizeof(status));
if (get_proto_alert_status(host, &status))
return;
json_object *tmp = json_object_new_int(status.alert_updates);
json_object_object_add(obj, "updates", tmp);
tmp = json_object_new_int(status.pending_min_sequence_id);
json_object_object_add(obj, "pending-min-seq-id", tmp);
tmp = json_object_new_int(status.pending_max_sequence_id);
json_object_object_add(obj, "pending-max-seq-id", tmp);
tmp = json_object_new_int(status.last_submitted_sequence_id);
json_object_object_add(obj, "last-submitted-seq-id", tmp);
}
static json_object *timestamp_to_json(const time_t *t)
{
struct tm *tmptr, tmbuf;
if (*t && (tmptr = gmtime_r(t, &tmbuf)) ) {
char timebuf[26];
strftime(timebuf, 26, "%Y-%m-%d %H:%M:%S", tmptr);
return json_object_new_string(timebuf);
}
return NULL;
}
#endif /* ENABLE_ACLK */
char *aclk_state_json(void)
{
#ifndef ENABLE_ACLK
return strdupz("{\"aclk-available\":false}");
#else
json_object *tmp, *grp, *msg = json_object_new_object();
tmp = json_object_new_boolean(1);
json_object_object_add(msg, "aclk-available", tmp);
tmp = json_object_new_int(2);
json_object_object_add(msg, "aclk-version", tmp);
grp = json_object_new_array();
tmp = json_object_new_string("Protobuf");
json_object_array_add(grp, tmp);
json_object_object_add(msg, "protocols-supported", grp);
char *agent_id = get_agent_claimid();
tmp = json_object_new_boolean(agent_id != NULL);
json_object_object_add(msg, "agent-claimed", tmp);
if (agent_id) {
tmp = json_object_new_string(agent_id);
freez(agent_id);
} else
tmp = NULL;
json_object_object_add(msg, "claimed-id", tmp);
char *cloud_base_url = appconfig_get(&cloud_config, CONFIG_SECTION_GLOBAL, "cloud base url", NULL);
tmp = cloud_base_url ? json_object_new_string(cloud_base_url) : NULL;
json_object_object_add(msg, "cloud-url", tmp);
tmp = json_object_new_boolean(aclk_connected);
json_object_object_add(msg, "online", tmp);
tmp = json_object_new_string("Protobuf");
json_object_object_add(msg, "used-cloud-protocol", tmp);
tmp = json_object_new_int(5);
json_object_object_add(msg, "mqtt-version", tmp);
tmp = json_object_new_int(aclk_rcvd_cloud_msgs);
json_object_object_add(msg, "received-app-layer-msgs", tmp);
tmp = json_object_new_int(aclk_pubacks_per_conn);
json_object_object_add(msg, "received-mqtt-pubacks", tmp);
tmp = json_object_new_int(aclk_connection_counter > 0 ? (aclk_connection_counter - 1) : 0);
json_object_object_add(msg, "reconnect-count", tmp);
json_object_object_add(msg, "last-connect-time-utc", timestamp_to_json(&last_conn_time_mqtt));
json_object_object_add(msg, "last-connect-time-puback-utc", timestamp_to_json(&last_conn_time_appl));
json_object_object_add(msg, "last-disconnect-time-utc", timestamp_to_json(&last_disconnect_time));
json_object_object_add(msg, "next-connection-attempt-utc", !aclk_connected ? timestamp_to_json(&next_connection_attempt) : NULL);
tmp = NULL;
if (!aclk_connected && last_backoff_value)
tmp = json_object_new_double(last_backoff_value);
json_object_object_add(msg, "last-backoff-value", tmp);
tmp = json_object_new_boolean(aclk_disable_runtime);
json_object_object_add(msg, "banned-by-cloud", tmp);
grp = json_object_new_array();
RRDHOST *host;
rrd_rdlock();
rrdhost_foreach_read(host) {
json_object *nodeinstance = json_object_new_object();
tmp = json_object_new_string(rrdhost_hostname(host));
json_object_object_add(nodeinstance, "hostname", tmp);
tmp = json_object_new_string(host->machine_guid);
json_object_object_add(nodeinstance, "mguid", tmp);
rrdhost_aclk_state_lock(host);
if (host->aclk_state.claimed_id) {
tmp = json_object_new_string(host->aclk_state.claimed_id);
json_object_object_add(nodeinstance, "claimed_id", tmp);
} else
json_object_object_add(nodeinstance, "claimed_id", NULL);
rrdhost_aclk_state_unlock(host);
if (host->node_id == NULL || uuid_is_null(*host->node_id)) {
json_object_object_add(nodeinstance, "node-id", NULL);
} else {
char node_id[GUID_LEN + 1];
uuid_unparse_lower(*host->node_id, node_id);
tmp = json_object_new_string(node_id);
json_object_object_add(nodeinstance, "node-id", tmp);
}
tmp = json_object_new_int(host->system_info->hops);
json_object_object_add(nodeinstance, "streaming-hops", tmp);
tmp = json_object_new_string(host == localhost ? "self" : "child");
json_object_object_add(nodeinstance, "relationship", tmp);
tmp = json_object_new_boolean((host->receiver || host == localhost));
json_object_object_add(nodeinstance, "streaming-online", tmp);
tmp = json_object_new_object();
fill_alert_status_for_host_json(tmp, host);
json_object_object_add(nodeinstance, "alert-sync-status", tmp);
json_object_array_add(grp, nodeinstance);
}
rrd_rdunlock();
json_object_object_add(msg, "node-instances", grp);
char *str = strdupz(json_object_to_json_string_ext(msg, JSON_C_TO_STRING_PLAIN));
json_object_put(msg);
return str;
#endif /* ENABLE_ACLK */
}
void add_aclk_host_labels(void) {
RRDLABELS *labels = localhost->rrdlabels;
#ifdef ENABLE_ACLK
rrdlabels_add(labels, "_aclk_available", "true", RRDLABEL_SRC_AUTO|RRDLABEL_SRC_ACLK);
ACLK_PROXY_TYPE aclk_proxy;
char *proxy_str;
aclk_get_proxy(&aclk_proxy);
switch(aclk_proxy) {
case PROXY_TYPE_SOCKS5:
proxy_str = "SOCKS5";
break;
case PROXY_TYPE_HTTP:
proxy_str = "HTTP";
break;
default:
proxy_str = "none";
break;
}
rrdlabels_add(labels, "_mqtt_version", "5", RRDLABEL_SRC_AUTO);
rrdlabels_add(labels, "_aclk_proxy", proxy_str, RRDLABEL_SRC_AUTO);
rrdlabels_add(labels, "_aclk_ng_new_cloud_protocol", "true", RRDLABEL_SRC_AUTO|RRDLABEL_SRC_ACLK);
#else
rrdlabels_add(labels, "_aclk_available", "false", RRDLABEL_SRC_AUTO|RRDLABEL_SRC_ACLK);
#endif
}
void aclk_queue_node_info(RRDHOST *host, bool immediate)
{
struct aclk_sync_cfg_t *wc = host->aclk_config;
if (likely(wc))
wc->node_info_send_time = (host == localhost || immediate) ? 1 : now_realtime_sec();
}