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// SPDX-License-Identifier: GPL-3.0-or-later
#include "watcher.h"
watcher_step_t *watcher_steps;
static struct completion shutdown_begin_completion;
static struct completion shutdown_end_completion;
static ND_THREAD *watcher_thread;
void watcher_shutdown_begin(void) {
completion_mark_complete(&shutdown_begin_completion);
}
void watcher_shutdown_end(void) {
completion_mark_complete(&shutdown_end_completion);
}
void watcher_step_complete(watcher_step_id_t step_id) {
completion_mark_complete(&watcher_steps[step_id].p);
}
static void watcher_wait_for_step(const watcher_step_id_t step_id)
{
unsigned timeout = 90;
usec_t step_start_time = now_monotonic_usec();
#ifdef ENABLE_SENTRY
// Wait with a timeout
bool ok = completion_timedwait_for(&watcher_steps[step_id].p, timeout);
#else
// Wait indefinitely
bool ok = true;
completion_wait_for(&watcher_steps[step_id].p);
#endif
usec_t step_duration = now_monotonic_usec() - step_start_time;
if (ok) {
netdata_log_info("shutdown step: [%d/%d] - '%s' finished in %llu milliseconds",
(int)step_id + 1, (int)WATCHER_STEP_ID_MAX,
watcher_steps[step_id].msg, step_duration / USEC_PER_MS);
} else {
// Do not call fatal() because it will try to execute the exit
// sequence twice.
netdata_log_error("shutdown step: [%d/%d] - '%s' took more than %u seconds (ie. %llu milliseconds)",
(int)step_id + 1, (int)WATCHER_STEP_ID_MAX, watcher_steps[step_id].msg,
timeout, step_duration / USEC_PER_MS);
abort();
}
}
void *watcher_main(void *arg)
{
UNUSED(arg);
netdata_log_debug(D_SYSTEM, "Watcher thread started");
// wait until the agent starts the shutdown process
completion_wait_for(&shutdown_begin_completion);
netdata_log_error("Shutdown process started");
usec_t shutdown_start_time = now_monotonic_usec();
watcher_wait_for_step(WATCHER_STEP_ID_CREATE_SHUTDOWN_FILE);
watcher_wait_for_step(WATCHER_STEP_ID_DBENGINE_EXIT_MODE);
watcher_wait_for_step(WATCHER_STEP_ID_CLOSE_WEBRTC_CONNECTIONS);
watcher_wait_for_step(WATCHER_STEP_ID_DISABLE_MAINTENANCE_NEW_QUERIES_NEW_WEB_REQUESTS_NEW_STREAMING_CONNECTIONS_AND_ACLK);
watcher_wait_for_step(WATCHER_STEP_ID_STOP_MAINTENANCE_THREAD);
watcher_wait_for_step(WATCHER_STEP_ID_STOP_EXPORTERS_HEALTH_AND_WEB_SERVERS_THREADS);
watcher_wait_for_step(WATCHER_STEP_ID_STOP_COLLECTORS_AND_STREAMING_THREADS);
watcher_wait_for_step(WATCHER_STEP_ID_STOP_REPLICATION_THREADS);
watcher_wait_for_step(WATCHER_STEP_ID_PREPARE_METASYNC_SHUTDOWN);
watcher_wait_for_step(WATCHER_STEP_ID_DISABLE_ML_DETECTION_AND_TRAINING_THREADS);
watcher_wait_for_step(WATCHER_STEP_ID_STOP_CONTEXT_THREAD);
watcher_wait_for_step(WATCHER_STEP_ID_CLEAR_WEB_CLIENT_CACHE);
watcher_wait_for_step(WATCHER_STEP_ID_STOP_ACLK_THREADS);
watcher_wait_for_step(WATCHER_STEP_ID_STOP_ALL_REMAINING_WORKER_THREADS);
watcher_wait_for_step(WATCHER_STEP_ID_CANCEL_MAIN_THREADS);
watcher_wait_for_step(WATCHER_STEP_ID_FLUSH_DBENGINE_TIERS);
watcher_wait_for_step(WATCHER_STEP_ID_STOP_COLLECTION_FOR_ALL_HOSTS);
watcher_wait_for_step(WATCHER_STEP_ID_STOP_METASYNC_THREADS);
watcher_wait_for_step(WATCHER_STEP_ID_WAIT_FOR_DBENGINE_COLLECTORS_TO_FINISH);
watcher_wait_for_step(WATCHER_STEP_ID_WAIT_FOR_DBENGINE_MAIN_CACHE_TO_FINISH_FLUSHING);
watcher_wait_for_step(WATCHER_STEP_ID_STOP_DBENGINE_TIERS);
watcher_wait_for_step(WATCHER_STEP_ID_CLOSE_SQL_DATABASES);
watcher_wait_for_step(WATCHER_STEP_ID_REMOVE_PID_FILE);
watcher_wait_for_step(WATCHER_STEP_ID_FREE_OPENSSL_STRUCTURES);
watcher_wait_for_step(WATCHER_STEP_ID_REMOVE_INCOMPLETE_SHUTDOWN_FILE);
completion_wait_for(&shutdown_end_completion);
usec_t shutdown_end_time = now_monotonic_usec();
usec_t shutdown_duration = shutdown_end_time - shutdown_start_time;
netdata_log_error("Shutdown process ended in %llu milliseconds",
shutdown_duration / USEC_PER_MS);
return NULL;
}
void watcher_thread_start() {
watcher_steps = callocz(WATCHER_STEP_ID_MAX, sizeof(watcher_step_t));
watcher_steps[WATCHER_STEP_ID_CREATE_SHUTDOWN_FILE].msg =
"create shutdown file";
watcher_steps[WATCHER_STEP_ID_DBENGINE_EXIT_MODE].msg =
"dbengine exit mode";
watcher_steps[WATCHER_STEP_ID_CLOSE_WEBRTC_CONNECTIONS].msg =
"close webrtc connections";
watcher_steps[WATCHER_STEP_ID_DISABLE_MAINTENANCE_NEW_QUERIES_NEW_WEB_REQUESTS_NEW_STREAMING_CONNECTIONS_AND_ACLK].msg =
"disable maintenance, new queries, new web requests, new streaming connections and aclk";
watcher_steps[WATCHER_STEP_ID_STOP_MAINTENANCE_THREAD].msg =
"stop maintenance thread";
watcher_steps[WATCHER_STEP_ID_STOP_EXPORTERS_HEALTH_AND_WEB_SERVERS_THREADS].msg =
"stop exporters, health and web servers threads";
watcher_steps[WATCHER_STEP_ID_STOP_COLLECTORS_AND_STREAMING_THREADS].msg =
"stop collectors and streaming threads";
watcher_steps[WATCHER_STEP_ID_STOP_REPLICATION_THREADS].msg =
"stop replication threads";
watcher_steps[WATCHER_STEP_ID_PREPARE_METASYNC_SHUTDOWN].msg =
"prepare metasync shutdown";
watcher_steps[WATCHER_STEP_ID_DISABLE_ML_DETECTION_AND_TRAINING_THREADS].msg =
"disable ML detection and training threads";
watcher_steps[WATCHER_STEP_ID_STOP_CONTEXT_THREAD].msg =
"stop context thread";
watcher_steps[WATCHER_STEP_ID_CLEAR_WEB_CLIENT_CACHE].msg =
"clear web client cache";
watcher_steps[WATCHER_STEP_ID_STOP_ACLK_THREADS].msg =
"stop aclk threads";
watcher_steps[WATCHER_STEP_ID_STOP_ALL_REMAINING_WORKER_THREADS].msg =
"stop all remaining worker threads";
watcher_steps[WATCHER_STEP_ID_CANCEL_MAIN_THREADS].msg =
"cancel main threads";
watcher_steps[WATCHER_STEP_ID_FLUSH_DBENGINE_TIERS].msg =
"flush dbengine tiers";
watcher_steps[WATCHER_STEP_ID_STOP_COLLECTION_FOR_ALL_HOSTS].msg =
"stop collection for all hosts";
watcher_steps[WATCHER_STEP_ID_STOP_METASYNC_THREADS].msg =
"stop metasync threads";
watcher_steps[WATCHER_STEP_ID_WAIT_FOR_DBENGINE_COLLECTORS_TO_FINISH].msg =
"wait for dbengine collectors to finish";
watcher_steps[WATCHER_STEP_ID_WAIT_FOR_DBENGINE_MAIN_CACHE_TO_FINISH_FLUSHING].msg =
"wait for dbengine main cache to finish flushing";
watcher_steps[WATCHER_STEP_ID_STOP_DBENGINE_TIERS].msg =
"stop dbengine tiers";
watcher_steps[WATCHER_STEP_ID_CLOSE_SQL_DATABASES].msg =
"close SQL databases";
watcher_steps[WATCHER_STEP_ID_REMOVE_PID_FILE].msg =
"remove pid file";
watcher_steps[WATCHER_STEP_ID_FREE_OPENSSL_STRUCTURES].msg =
"free openssl structures";
watcher_steps[WATCHER_STEP_ID_REMOVE_INCOMPLETE_SHUTDOWN_FILE].msg =
"remove incomplete shutdown file";
for (size_t i = 0; i != WATCHER_STEP_ID_MAX; i++) {
completion_init(&watcher_steps[i].p);
}
completion_init(&shutdown_begin_completion);
completion_init(&shutdown_end_completion);
watcher_thread = nd_thread_create("P[WATCHER]", NETDATA_THREAD_OPTION_JOINABLE, watcher_main, NULL);
}
void watcher_thread_stop() {
nd_thread_join(watcher_thread);
for (size_t i = 0; i != WATCHER_STEP_ID_MAX; i++) {
completion_destroy(&watcher_steps[i].p);
}
completion_destroy(&shutdown_begin_completion);
completion_destroy(&shutdown_end_completion);
freez(watcher_steps);
}
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