16725696051

Committed 04 Aug 2025 02:17PM UTC coverage: 92.176%. Remained the same

Build # 16725696051

Build Type

push

github

Committed by

steve-chavez

Commit Message

test: avoid sleeping in truncate test to flakiness

We only need to ensure the truncate succeeds fast, not necessary to
sleep.

Also adjust sleep time of test_http_responses_will_delete_despite_restart.

Coverage Stats

483 of 524 relevant lines covered (92.18%)

207.21 hits per line

Source File
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94.63

/src/worker.c

#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <inttypes.h>

#define PG_PRELUDE_IMPL
#include "pg_prelude.h"
#include "curl_prelude.h"
#include "util.h"
#include "errors.h"
#include "core.h"
#include "event.h"

#define MIN_LIBCURL_VERSION_NUM 0x075300 // This is the 7.83.0 version in hex as defined in curl/curlver.h
#define REQUIRED_LIBCURL_ERR_MSG "libcurl >= 7.83.0 is required, we use the curl_easy_nextheader() function added in this version"
_Static_assert(LIBCURL_VERSION_NUM, REQUIRED_LIBCURL_ERR_MSG); // test for older libcurl versions that don't even have LIBCURL_VERSION_NUM defined (e.g. libcurl 6.5).
_Static_assert(LIBCURL_VERSION_NUM >= MIN_LIBCURL_VERSION_NUM, REQUIRED_LIBCURL_ERR_MSG);

PG_MODULE_MAGIC;

typedef enum {
  WORKER_WAIT_NO_TIMEOUT,
  WORKER_WAIT_ONE_SECOND,
} WorkerWait;

static WorkerState *worker_state = NULL;

static const int                curl_handle_event_timeout_ms = 1000;
static const int                net_worker_restart_time_sec = 1;
static const long               no_timeout = -1L;
static bool                     wake_commit_cb_active = false;
static bool                     worker_should_restart = false;
static const size_t             total_extension_tables = 2;

static char*                    guc_ttl;
static int                      guc_batch_size;
static char*                    guc_database_name;
static char*                    guc_username;
static MemoryContext            CurlMemContext = NULL;
static shmem_startup_hook_type  prev_shmem_startup_hook = NULL;
static volatile sig_atomic_t    got_sighup = false;

void _PG_init(void);

#if PG_VERSION_NUM >= 180000
  PGDLLEXPORT pg_noreturn void pg_net_worker(Datum main_arg);
#else
  PGDLLEXPORT void pg_net_worker(Datum main_arg) pg_attribute_noreturn();
#endif

PG_FUNCTION_INFO_V1(worker_restart);
Datum worker_restart(__attribute__ ((unused)) PG_FUNCTION_ARGS) {
  bool result = DatumGetBool(DirectFunctionCall1(pg_reload_conf, (Datum) NULL)); // reload the config
  pg_atomic_write_u32(&worker_state->got_restart, 1);
  pg_write_barrier();
  if(worker_state->shared_latch)
    SetLatch(worker_state->shared_latch);
  PG_RETURN_BOOL(result); // TODO is not necessary to return a bool here, but we do it to maintain backward compatibility
}

static void wait_until_state(WorkerState *ws, WorkerStatus expected_status){
  if (pg_atomic_read_u32(&ws->status) == expected_status) // fast return without sleeping, in case condition is fulfilled
    return;

  ConditionVariablePrepareToSleep(&ws->cv);
  while (pg_atomic_read_u32(&ws->status) != expected_status) {
    ConditionVariableSleep(&ws->cv, PG_WAIT_EXTENSION);
  }
  ConditionVariableCancelSleep();
}

PG_FUNCTION_INFO_V1(wait_until_running);
Datum wait_until_running(__attribute__ ((unused)) PG_FUNCTION_ARGS){
  wait_until_state(worker_state, WS_RUNNING);

  PG_RETURN_VOID();
}

// only wake at commit time to prevent excessive and unnecessary wakes.
// e.g only one wake when doing `select net.http_get('http://localhost:8080/pathological?status=200') from generate_series(1,100000);`
static void wake_at_commit(XactEvent event, __attribute__ ((unused)) void *arg){
  elog(DEBUG2, "pg_net xact callback received: %s", xact_event_name(event));

  switch(event){
    case XACT_EVENT_COMMIT:
    case XACT_EVENT_PARALLEL_COMMIT:
      if(wake_commit_cb_active){
        uint32 expected = 0;
        bool success = pg_atomic_compare_exchange_u32(&worker_state->should_wake, &expected, 1);
        pg_write_barrier();

        if (success) // only wake the worker on first put, so if many concurrent wakes come we only wake once
          SetLatch(worker_state->shared_latch);

        wake_commit_cb_active = false;
      }
      break;
    // TODO: `PREPARE TRANSACTION 'xx';` and `COMMIT PREPARED TRANSACTION 'xx';` do not wake the worker automatically, they require a manual `net.wake()`
    // These are disabled by default and rarely used, see `max_prepared_transactions` https://www.postgresql.org/docs/17/runtime-config-resource.html#GUC-MAX-PREPARED-TRANSACTIONS
    case XACT_EVENT_PREPARE:
    // abort the callback on rollback
    case XACT_EVENT_ABORT:
    case XACT_EVENT_PARALLEL_ABORT:
      wake_commit_cb_active = false;
      break;
    default:
      break;
  }
}

PG_FUNCTION_INFO_V1(wake);
Datum wake(__attribute__ ((unused)) PG_FUNCTION_ARGS) {
  if (!wake_commit_cb_active) { // register only one callback per transaction
    RegisterXactCallback(wake_at_commit, NULL);
    wake_commit_cb_active = true;
  }

  PG_RETURN_VOID();
}

static void
handle_sigterm(__attribute__ ((unused)) SIGNAL_ARGS)
{
  int save_errno = errno;
  pg_atomic_write_u32(&worker_state->got_restart, 1);
  pg_write_barrier();
  if(worker_state->shared_latch)
    SetLatch(worker_state->shared_latch);
  errno = save_errno;
}

static void
handle_sighup(__attribute__ ((unused)) SIGNAL_ARGS)
{
  int     save_errno = errno;
  got_sighup = true;
  if(worker_state->shared_latch)
    SetLatch(worker_state->shared_latch);
  errno = save_errno;
}

/*
 *We have to handle sigusr1 explicitly because the default
 *procsignal_sigusr1_handler doesn't `SetLatch`, this would prevent
 *DROP DATATABASE from finishing since our worker would be sleeping and not reach
 *CHECK_FOR_INTERRUPTS()
 */
static void
handle_sigusr1(SIGNAL_ARGS)
{
  int     save_errno = errno;
  if(worker_state->shared_latch)
    SetLatch(worker_state->shared_latch);
  errno = save_errno;
  procsignal_sigusr1_handler(postgres_signal_arg);
}

static void publish_state(WorkerStatus s) {
  pg_atomic_write_u32(&worker_state->status, (uint32)s);
  pg_write_barrier();
  ConditionVariableBroadcast(&worker_state->cv);
}

static void
net_on_exit(__attribute__ ((unused)) int code, __attribute__ ((unused)) Datum arg){
  worker_should_restart = false;
  pg_atomic_write_u32(&worker_state->should_wake, 1); // ensure the remaining work will continue since we'll restart

  worker_state->shared_latch = NULL;

  ev_monitor_close(worker_state);

  curl_multi_cleanup(worker_state->curl_mhandle);
  curl_global_cleanup();
}

// wait according to the wait type while ensuring interrupts are processed while waiting
static void wait_while_processing_interrupts(WorkerWait ww, bool *should_restart){
  switch(ww){
    case WORKER_WAIT_NO_TIMEOUT:
      WaitLatch(worker_state->shared_latch,
                WL_LATCH_SET | WL_EXIT_ON_PM_DEATH,
                no_timeout,
                PG_WAIT_EXTENSION);
      ResetLatch(worker_state->shared_latch);
      break;
    case WORKER_WAIT_ONE_SECOND:
      WaitLatch(worker_state->shared_latch, WL_LATCH_SET | WL_TIMEOUT | WL_EXIT_ON_PM_DEATH, 1000, PG_WAIT_EXTENSION);
      ResetLatch(worker_state->shared_latch);
      break;
  }

  CHECK_FOR_INTERRUPTS();

  if (got_sighup) {
    got_sighup = false;
    ProcessConfigFile(PGC_SIGHUP);
  }

  if (pg_atomic_exchange_u32(&worker_state->got_restart, 0)){
    *should_restart = true;
  }
}

static bool is_extension_locked(Oid ext_table_oids[static total_extension_tables]){
  Oid net_oid = get_namespace_oid("net", true);

  if(!OidIsValid(net_oid)){
    return false;
  }

  Oid queue_oid = get_relname_relid("http_request_queue", net_oid);
  Oid resp_oid = get_relname_relid("_http_response", net_oid);

  bool is_locked = ConditionalLockRelationOid(queue_oid, AccessShareLock) && ConditionalLockRelationOid(resp_oid, AccessShareLock);

  if (is_locked) {
    ext_table_oids[0] = queue_oid;
    ext_table_oids[1] = resp_oid;
  }

  return is_locked;
}

static void unlock_extension(Oid ext_table_oids[static total_extension_tables]){
  UnlockRelationOid(ext_table_oids[0], AccessShareLock);
  UnlockRelationOid(ext_table_oids[1], AccessShareLock);
}

void pg_net_worker(__attribute__ ((unused)) Datum main_arg) {
  worker_state->shared_latch = &MyProc->procLatch;
  on_proc_exit(net_on_exit, 0);

  BackgroundWorkerUnblockSignals();
  pqsignal(SIGTERM, handle_sigterm);
  pqsignal(SIGHUP, handle_sighup);
  pqsignal(SIGUSR1, handle_sigusr1);

  BackgroundWorkerInitializeConnection(guc_database_name, guc_username, 0);
  pgstat_report_appname("pg_net " EXTVERSION); // set appname for pg_stat_activity

  elog(INFO, "pg_net worker started with a config of: pg_net.ttl=%s, pg_net.batch_size=%d, pg_net.username=%s, pg_net.database_name=%s", guc_ttl, guc_batch_size, guc_username, guc_database_name);

  int curl_ret = curl_global_init(CURL_GLOBAL_ALL);
  if(curl_ret != CURLE_OK)
    ereport(ERROR, errmsg("curl_global_init() returned %s\n", curl_easy_strerror(curl_ret)));

  worker_state->epfd = event_monitor();

  if (worker_state->epfd < 0) {
    ereport(ERROR, errmsg("Failed to create event monitor file descriptor"));
  }

  worker_state->curl_mhandle = curl_multi_init();
  if(!worker_state->curl_mhandle)
    ereport(ERROR, errmsg("curl_multi_init()"));

  set_curl_mhandle(worker_state);

  publish_state(WS_RUNNING);

  do {

    uint32 expected = 1;
    if (!pg_atomic_compare_exchange_u32(&worker_state->should_wake, &expected, 0)){
      elog(DEBUG1, "pg_net worker waiting for wake");
      wait_while_processing_interrupts(WORKER_WAIT_NO_TIMEOUT, &worker_should_restart);
      continue;
    }

    uint64 requests_consumed = 0;
    uint64 expired_responses = 0;

    do {
      SetCurrentStatementStartTimestamp();
      StartTransactionCommand();
      PushActiveSnapshot(GetTransactionSnapshot());

      Oid ext_table_oids[total_extension_tables];

      if(!is_extension_locked(ext_table_oids)){
        elog(DEBUG1, "pg_net extension not loaded");
        PopActiveSnapshot();
        AbortCurrentTransaction();
        break;
      }

      expired_responses = delete_expired_responses(guc_ttl, guc_batch_size);

      elog(DEBUG1, "Deleted "UINT64_FORMAT" expired rows", expired_responses);

      requests_consumed = consume_request_queue(worker_state->curl_mhandle, guc_batch_size, CurlMemContext);

      elog(DEBUG1, "Consumed "UINT64_FORMAT" request rows", requests_consumed);

      if(requests_consumed > 0){
        int running_handles = 0;
        int maxevents = guc_batch_size + 1; // 1 extra for the timer
        event events[maxevents];

        do {
          int nfds = wait_event(worker_state->epfd, events, maxevents, curl_handle_event_timeout_ms);
          if (nfds < 0) {
            int save_errno = errno;
            if(save_errno == EINTR) { // can happen when the wait is interrupted, for example when running under GDB. Just continue in this case.
              elog(DEBUG1, "wait_event() got %s, continuing", strerror(save_errno));
              continue;
            }
            else {
              ereport(ERROR, errmsg("wait_event() failed: %s", strerror(save_errno)));
              break;
            }
          }

          for (int i = 0; i < nfds; i++) {
            if (is_timer(events[i])) {
              EREPORT_MULTI(
                curl_multi_socket_action(worker_state->curl_mhandle, CURL_SOCKET_TIMEOUT, 0, &running_handles)
              );
            } else {
              int curl_event = get_curl_event(events[i]);
              int sockfd = get_socket_fd(events[i]);

              EREPORT_MULTI(
                curl_multi_socket_action(
                  worker_state->curl_mhandle,
                  sockfd,
                  curl_event,
                  &running_handles)
              );
            }

            insert_curl_responses(worker_state, CurlMemContext);
          }

          elog(DEBUG1, "Pending curl running_handles: %d", running_handles);
        } while (running_handles > 0); // run while there are curl handles, some won't finish in a single iteration since they could be slow and waiting for a timeout
      }

      unlock_extension(ext_table_oids);

      PopActiveSnapshot();
      CommitTransactionCommand();

      MemoryContextReset(CurlMemContext);

      // slow down queue processing to avoid using too much CPU
      wait_while_processing_interrupts(WORKER_WAIT_ONE_SECOND, &worker_should_restart);

    } while (!worker_should_restart && (requests_consumed > 0 || expired_responses > 0));

  } while (!worker_should_restart);

  publish_state(WS_EXITED);

  // causing a failure on exit will make the postmaster process restart the bg worker
  proc_exit(EXIT_FAILURE);
}

static void net_shmem_startup(void) {
  if (prev_shmem_startup_hook)
    prev_shmem_startup_hook();

  bool found;

  worker_state = ShmemInitStruct("pg_net worker state", sizeof(WorkerState), &found);

  if (!found) {
    pg_atomic_init_u32(&worker_state->got_restart, 0);
    pg_atomic_init_u32(&worker_state->status, WS_NOT_YET);
    pg_atomic_init_u32(&worker_state->should_wake, 1);
    worker_state->shared_latch = NULL;

    ConditionVariableInit(&worker_state->cv);
    worker_state->epfd = 0;
    worker_state->curl_mhandle = NULL;
  }
}

void _PG_init(void) {
  if (IsBinaryUpgrade) {
      return;
  }

  if (!process_shared_preload_libraries_in_progress) {
      ereport(ERROR, errmsg("pg_net is not in shared_preload_libraries"),
              errhint("Add pg_net to the shared_preload_libraries "
                      "configuration variable in postgresql.conf."));
  }

  RegisterBackgroundWorker(&(BackgroundWorker){
    .bgw_flags = BGWORKER_SHMEM_ACCESS | BGWORKER_BACKEND_DATABASE_CONNECTION,
    .bgw_start_time = BgWorkerStart_RecoveryFinished,
    .bgw_library_name = "pg_net",
    .bgw_function_name = "pg_net_worker",
    .bgw_name = "pg_net " EXTVERSION " worker",
    .bgw_restart_time = net_worker_restart_time_sec,
  });

  prev_shmem_startup_hook = shmem_startup_hook;
  shmem_startup_hook = net_shmem_startup;

  CurlMemContext = AllocSetContextCreate(TopMemoryContext,
                       "pg_net curl context",
                       ALLOCSET_DEFAULT_MINSIZE,
                       ALLOCSET_DEFAULT_INITSIZE,
                       ALLOCSET_DEFAULT_MAXSIZE);

  DefineCustomStringVariable("pg_net.ttl",
                 "time to live for request/response rows",
                 "should be a valid interval type",
                 &guc_ttl,
                 "6 hours",
                 PGC_SIGHUP, 0,
                 NULL, NULL, NULL);

  DefineCustomIntVariable("pg_net.batch_size",
                 "number of requests executed in one iteration of the background worker",
                 NULL,
                 &guc_batch_size,
                 200,
                 0, PG_INT16_MAX,
                 PGC_SIGHUP, 0,
                 NULL, NULL, NULL);

  DefineCustomStringVariable("pg_net.database_name",
                "Database where the worker will connect to",
                NULL,
                &guc_database_name,
                "postgres",
                PGC_SU_BACKEND, 0,
                NULL, NULL, NULL);

  DefineCustomStringVariable("pg_net.username",
                "Connection user for the worker",
                NULL,
                &guc_username,
                NULL,
                PGC_SU_BACKEND, 0,
                NULL, NULL, NULL);
}

1	#include <unistd.h>
2	#include <errno.h>
3	#include <string.h>
4	#include <inttypes.h>
5
6	#define PG_PRELUDE_IMPL
7	#include "pg_prelude.h"
8	#include "curl_prelude.h"
9	#include "util.h"
10	#include "errors.h"
11	#include "core.h"
12	#include "event.h"
13
14	#define MIN_LIBCURL_VERSION_NUM 0x075300 // This is the 7.83.0 version in hex as defined in curl/curlver.h
15	#define REQUIRED_LIBCURL_ERR_MSG "libcurl >= 7.83.0 is required, we use the curl_easy_nextheader() function added in this version"
16	_Static_assert(LIBCURL_VERSION_NUM, REQUIRED_LIBCURL_ERR_MSG); // test for older libcurl versions that don't even have LIBCURL_VERSION_NUM defined (e.g. libcurl 6.5).
17	_Static_assert(LIBCURL_VERSION_NUM >= MIN_LIBCURL_VERSION_NUM, REQUIRED_LIBCURL_ERR_MSG);
18
19	PG_MODULE_MAGIC;	95✔
20
21	typedef enum {
22	WORKER_WAIT_NO_TIMEOUT,
23	WORKER_WAIT_ONE_SECOND,
24	} WorkerWait;
25
26	static WorkerState *worker_state = NULL;
27
28	static const int curl_handle_event_timeout_ms = 1000;
29	static const int net_worker_restart_time_sec = 1;
30	static const long no_timeout = -1L;
31	static bool wake_commit_cb_active = false;
32	static bool worker_should_restart = false;
33	static const size_t total_extension_tables = 2;
34
35	static char* guc_ttl;
36	static int guc_batch_size;
37	static char* guc_database_name;
38	static char* guc_username;
39	static MemoryContext CurlMemContext = NULL;
40	static shmem_startup_hook_type prev_shmem_startup_hook = NULL;
41	static volatile sig_atomic_t got_sighup = false;
42
43	void _PG_init(void);
44
45	#if PG_VERSION_NUM >= 180000
46	PGDLLEXPORT pg_noreturn void pg_net_worker(Datum main_arg);
47	#else
48	PGDLLEXPORT void pg_net_worker(Datum main_arg) pg_attribute_noreturn();
49	#endif
50
51	PG_FUNCTION_INFO_V1(worker_restart);	66✔
52	Datum worker_restart(__attribute__ ((unused)) PG_FUNCTION_ARGS) {	17✔
53	bool result = DatumGetBool(DirectFunctionCall1(pg_reload_conf, (Datum) NULL)); // reload the config	17✔
54	pg_atomic_write_u32(&worker_state->got_restart, 1);	17✔
55	pg_write_barrier();	17✔
56	if(worker_state->shared_latch)	17✔
57	SetLatch(worker_state->shared_latch);	16✔
58	PG_RETURN_BOOL(result); // TODO is not necessary to return a bool here, but we do it to maintain backward compatibility	17✔
59	}
60
61	static void wait_until_state(WorkerState *ws, WorkerStatus expected_status){	18✔
62	if (pg_atomic_read_u32(&ws->status) == expected_status) // fast return without sleeping, in case condition is fulfilled	18✔
63	return;
64
65	ConditionVariablePrepareToSleep(&ws->cv);	16✔
66	while (pg_atomic_read_u32(&ws->status) != expected_status) {	32✔
67	ConditionVariableSleep(&ws->cv, PG_WAIT_EXTENSION);	16✔
68	}
69	ConditionVariableCancelSleep();	16✔
70	}
71
72	PG_FUNCTION_INFO_V1(wait_until_running);	67✔
73	Datum wait_until_running(__attribute__ ((unused)) PG_FUNCTION_ARGS){	18✔
74	wait_until_state(worker_state, WS_RUNNING);	18✔
75
76	PG_RETURN_VOID();	18✔
77	}
78
79	// only wake at commit time to prevent excessive and unnecessary wakes.
80	// e.g only one wake when doing `select net.http_get('http://localhost:8080/pathological?status=200') from generate_series(1,100000);`
81	static void wake_at_commit(XactEvent event, __attribute__ ((unused)) void *arg){	292✔
82	elog(DEBUG2, "pg_net xact callback received: %s", xact_event_name(event));	292✔
83
84	switch(event){	292✔
85	case XACT_EVENT_COMMIT:	120✔
86	case XACT_EVENT_PARALLEL_COMMIT:
87	if(wake_commit_cb_active){	120✔
88	uint32 expected = 0;	48✔
89	bool success = pg_atomic_compare_exchange_u32(&worker_state->should_wake, &expected, 1);	48✔
90	pg_write_barrier();	48✔
91
92	if (success) // only wake the worker on first put, so if many concurrent wakes come we only wake once	48✔
93	SetLatch(worker_state->shared_latch);	22✔
94
95	wake_commit_cb_active = false;	48✔
96	}
97	break;
98	// TODO: `PREPARE TRANSACTION 'xx';` and `COMMIT PREPARED TRANSACTION 'xx';` do not wake the worker automatically, they require a manual `net.wake()`
99	// These are disabled by default and rarely used, see `max_prepared_transactions` https://www.postgresql.org/docs/17/runtime-config-resource.html#GUC-MAX-PREPARED-TRANSACTIONS
100	case XACT_EVENT_PREPARE:	52✔
101	// abort the callback on rollback
102	case XACT_EVENT_ABORT:
103	case XACT_EVENT_PARALLEL_ABORT:
104	wake_commit_cb_active = false;	52✔
105	break;	52✔
106	default:
107	break;
108	}
109	}	292✔
110
111	PG_FUNCTION_INFO_V1(wake);	100✔
112	Datum wake(__attribute__ ((unused)) PG_FUNCTION_ARGS) {	433✔
113	if (!wake_commit_cb_active) { // register only one callback per transaction	433✔
114	RegisterXactCallback(wake_at_commit, NULL);	54✔
115	wake_commit_cb_active = true;	54✔
116	}
117
118	PG_RETURN_VOID();	433✔
119	}
120
121	static void
122	handle_sigterm(__attribute__ ((unused)) SIGNAL_ARGS)	2✔
123	{
124	int save_errno = errno;	2✔
125	pg_atomic_write_u32(&worker_state->got_restart, 1);	2✔
126	pg_write_barrier();	2✔
127	if(worker_state->shared_latch)	2✔
128	SetLatch(worker_state->shared_latch);	2✔
129	errno = save_errno;	2✔
130	}	2✔
131
132	static void
133	handle_sighup(__attribute__ ((unused)) SIGNAL_ARGS)	18✔
134	{
135	int save_errno = errno;	18✔
136	got_sighup = true;	18✔
137	if(worker_state->shared_latch)	18✔
138	SetLatch(worker_state->shared_latch);	3✔
139	errno = save_errno;	18✔
140	}	18✔
141
142	/*
143	*We have to handle sigusr1 explicitly because the default
144	*procsignal_sigusr1_handler doesn't `SetLatch`, this would prevent
145	*DROP DATATABASE from finishing since our worker would be sleeping and not reach
146	*CHECK_FOR_INTERRUPTS()
147	*/
148	static void
149	handle_sigusr1(SIGNAL_ARGS)	4✔
150	{
151	int save_errno = errno;	4✔
152	if(worker_state->shared_latch)	4✔
153	SetLatch(worker_state->shared_latch);	4✔
154	errno = save_errno;	4✔
155	procsignal_sigusr1_handler(postgres_signal_arg);	4✔
156	}	4✔
157
158	static void publish_state(WorkerStatus s) {	38✔
159	pg_atomic_write_u32(&worker_state->status, (uint32)s);	38✔
160	pg_write_barrier();	38✔
161	ConditionVariableBroadcast(&worker_state->cv);	38✔
162	}	38✔
163
164	static void
165	net_on_exit(__attribute__ ((unused)) int code, __attribute__ ((unused)) Datum arg){	19✔
166	worker_should_restart = false;	19✔
167	pg_atomic_write_u32(&worker_state->should_wake, 1); // ensure the remaining work will continue since we'll restart	19✔
168
169	worker_state->shared_latch = NULL;	19✔
170
171	ev_monitor_close(worker_state);	19✔
172
173	curl_multi_cleanup(worker_state->curl_mhandle);	19✔
174	curl_global_cleanup();	19✔
175	}	19✔
176
177	// wait according to the wait type while ensuring interrupts are processed while waiting
178	static void wait_while_processing_interrupts(WorkerWait ww, bool *should_restart){	108✔
179	switch(ww){	108✔
180	case WORKER_WAIT_NO_TIMEOUT:	28✔
181	WaitLatch(worker_state->shared_latch,	28✔
182	WL_LATCH_SET \| WL_EXIT_ON_PM_DEATH,
183	no_timeout,
184	PG_WAIT_EXTENSION);
185	ResetLatch(worker_state->shared_latch);	28✔
186	break;	28✔
187	case WORKER_WAIT_ONE_SECOND:	80✔
188	WaitLatch(worker_state->shared_latch, WL_LATCH_SET \| WL_TIMEOUT \| WL_EXIT_ON_PM_DEATH, 1000, PG_WAIT_EXTENSION);	80✔
189	ResetLatch(worker_state->shared_latch);	80✔
190	break;	80✔
191	}
192
193	CHECK_FOR_INTERRUPTS();	108✔
194
195	if (got_sighup) {	108✔
196	got_sighup = false;	3✔
197	ProcessConfigFile(PGC_SIGHUP);	3✔
198	}
199
200	if (pg_atomic_exchange_u32(&worker_state->got_restart, 0)){	108✔
201	*should_restart = true;	19✔
202	}
203	}	108✔
204
205	static bool is_extension_locked(Oid ext_table_oids[static total_extension_tables]){	84✔
206	Oid net_oid = get_namespace_oid("net", true);	84✔
207
208	if(!OidIsValid(net_oid)){	84✔
209	return false;
210	}
211
212	Oid queue_oid = get_relname_relid("http_request_queue", net_oid);	81✔
213	Oid resp_oid = get_relname_relid("_http_response", net_oid);	81✔
214
215	bool is_locked = ConditionalLockRelationOid(queue_oid, AccessShareLock) && ConditionalLockRelationOid(resp_oid, AccessShareLock);	81✔
216
217	if (is_locked) {	80✔
218	ext_table_oids[0] = queue_oid;	80✔
219	ext_table_oids[1] = resp_oid;	80✔
220	}
221
222	return is_locked;
223	}
224
225	static void unlock_extension(Oid ext_table_oids[static total_extension_tables]){	80✔
226	UnlockRelationOid(ext_table_oids[0], AccessShareLock);	80✔
227	UnlockRelationOid(ext_table_oids[1], AccessShareLock);	80✔
228	}	80✔
229
230	void pg_net_worker(__attribute__ ((unused)) Datum main_arg) {	19✔
231	worker_state->shared_latch = &MyProc->procLatch;	19✔
232	on_proc_exit(net_on_exit, 0);	19✔
233
234	BackgroundWorkerUnblockSignals();	19✔
235	pqsignal(SIGTERM, handle_sigterm);	19✔
236	pqsignal(SIGHUP, handle_sighup);	19✔
237	pqsignal(SIGUSR1, handle_sigusr1);	19✔
238
239	BackgroundWorkerInitializeConnection(guc_database_name, guc_username, 0);	19✔
240	pgstat_report_appname("pg_net " EXTVERSION); // set appname for pg_stat_activity	19✔
241
242	elog(INFO, "pg_net worker started with a config of: pg_net.ttl=%s, pg_net.batch_size=%d, pg_net.username=%s, pg_net.database_name=%s", guc_ttl, guc_batch_size, guc_username, guc_database_name);	19✔
243
244	int curl_ret = curl_global_init(CURL_GLOBAL_ALL);	19✔
245	if(curl_ret != CURLE_OK)	19✔
246	ereport(ERROR, errmsg("curl_global_init() returned %s\n", curl_easy_strerror(curl_ret)));	×
247
248	worker_state->epfd = event_monitor();	19✔
249
250	if (worker_state->epfd < 0) {	19✔
251	ereport(ERROR, errmsg("Failed to create event monitor file descriptor"));	×
252	}
253
254	worker_state->curl_mhandle = curl_multi_init();	19✔
255	if(!worker_state->curl_mhandle)	19✔
256	ereport(ERROR, errmsg("curl_multi_init()"));	×
257
258	set_curl_mhandle(worker_state);	19✔
259
260	publish_state(WS_RUNNING);	19✔
261
262	do {	65✔
263
264	uint32 expected = 1;	65✔
265	if (!pg_atomic_compare_exchange_u32(&worker_state->should_wake, &expected, 0)){	65✔
266	elog(DEBUG1, "pg_net worker waiting for wake");	28✔
267	wait_while_processing_interrupts(WORKER_WAIT_NO_TIMEOUT, &worker_should_restart);	28✔
268	continue;	28✔
269	}
270
271	uint64 requests_consumed = 0;	84✔
272	uint64 expired_responses = 0;	84✔
273
274	do {	84✔
275	SetCurrentStatementStartTimestamp();	84✔
276	StartTransactionCommand();	84✔
277	PushActiveSnapshot(GetTransactionSnapshot());	84✔
278
279	Oid ext_table_oids[total_extension_tables];	84✔
280
281	if(!is_extension_locked(ext_table_oids)){	84✔
282	elog(DEBUG1, "pg_net extension not loaded");	4✔
283	PopActiveSnapshot();	4✔
284	AbortCurrentTransaction();	4✔
285	break;	4✔
286	}
287
288	expired_responses = delete_expired_responses(guc_ttl, guc_batch_size);	80✔
289
290	elog(DEBUG1, "Deleted "UINT64_FORMAT" expired rows", expired_responses);	80✔
291
292	requests_consumed = consume_request_queue(worker_state->curl_mhandle, guc_batch_size, CurlMemContext);	80✔
293
294	elog(DEBUG1, "Consumed "UINT64_FORMAT" request rows", requests_consumed);	80✔
295
296	if(requests_consumed > 0){	80✔
297	int running_handles = 0;	51✔
298	int maxevents = guc_batch_size + 1; // 1 extra for the timer	51✔
299	event events[maxevents];	51✔
300
301	do {	169✔
302	int nfds = wait_event(worker_state->epfd, events, maxevents, curl_handle_event_timeout_ms);	169✔
303	if (nfds < 0) {	169✔
304	int save_errno = errno;	×
305	if(save_errno == EINTR) { // can happen when the wait is interrupted, for example when running under GDB. Just continue in this case.	×
306	elog(DEBUG1, "wait_event() got %s, continuing", strerror(save_errno));	×
307	continue;	×
308	}
309	else {
310	ereport(ERROR, errmsg("wait_event() failed: %s", strerror(save_errno)));	×
311	break;
312	}
313	}
314
315	for (int i = 0; i < nfds; i++) {	1,027✔
316	if (is_timer(events[i])) {	858✔
317	EREPORT_MULTI(	62✔
318	curl_multi_socket_action(worker_state->curl_mhandle, CURL_SOCKET_TIMEOUT, 0, &running_handles)
319	);
320	} else {
321	int curl_event = get_curl_event(events[i]);	796✔
322	int sockfd = get_socket_fd(events[i]);	796✔
323
324	EREPORT_MULTI(	796✔
325	curl_multi_socket_action(
326	worker_state->curl_mhandle,
327	sockfd,
328	curl_event,
329	&running_handles)
330	);
331	}
332
333	insert_curl_responses(worker_state, CurlMemContext);	858✔
334	}
335
336	elog(DEBUG1, "Pending curl running_handles: %d", running_handles);	169✔
337	} while (running_handles > 0); // run while there are curl handles, some won't finish in a single iteration since they could be slow and waiting for a timeout	169✔
338	}
339
340	unlock_extension(ext_table_oids);	80✔
341
342	PopActiveSnapshot();	80✔
343	CommitTransactionCommand();	80✔
344
345	MemoryContextReset(CurlMemContext);	80✔
346
347	// slow down queue processing to avoid using too much CPU
348	wait_while_processing_interrupts(WORKER_WAIT_ONE_SECOND, &worker_should_restart);	80✔
349
350	} while (!worker_should_restart && (requests_consumed > 0 \|\| expired_responses > 0));	80✔
351
352	} while (!worker_should_restart);	65✔
353
354	publish_state(WS_EXITED);	19✔
355
356	// causing a failure on exit will make the postmaster process restart the bg worker
357	proc_exit(EXIT_FAILURE);	19✔
358	}
359
360	static void net_shmem_startup(void) {	95✔
361	if (prev_shmem_startup_hook)	95✔
362	prev_shmem_startup_hook();	×
363
364	bool found;	95✔
365
366	worker_state = ShmemInitStruct("pg_net worker state", sizeof(WorkerState), &found);	95✔
367
368	if (!found) {	95✔
369	pg_atomic_init_u32(&worker_state->got_restart, 0);	95✔
370	pg_atomic_init_u32(&worker_state->status, WS_NOT_YET);	95✔
371	pg_atomic_init_u32(&worker_state->should_wake, 1);	95✔
372	worker_state->shared_latch = NULL;	95✔
373
374	ConditionVariableInit(&worker_state->cv);	95✔
375	worker_state->epfd = 0;	95✔
376	worker_state->curl_mhandle = NULL;	95✔
377	}
378	}	95✔
379
380	void _PG_init(void) {	95✔
381	if (IsBinaryUpgrade) {	95✔
382	return;	×
383	}
384
385	if (!process_shared_preload_libraries_in_progress) {	95✔
386	ereport(ERROR, errmsg("pg_net is not in shared_preload_libraries"),	×
387	errhint("Add pg_net to the shared_preload_libraries "
388	"configuration variable in postgresql.conf."));
389	}
390
391	RegisterBackgroundWorker(&(BackgroundWorker){	95✔
392	.bgw_flags = BGWORKER_SHMEM_ACCESS \| BGWORKER_BACKEND_DATABASE_CONNECTION,
393	.bgw_start_time = BgWorkerStart_RecoveryFinished,
394	.bgw_library_name = "pg_net",
395	.bgw_function_name = "pg_net_worker",
396	.bgw_name = "pg_net " EXTVERSION " worker",
397	.bgw_restart_time = net_worker_restart_time_sec,
398	});
399
400	prev_shmem_startup_hook = shmem_startup_hook;	95✔
401	shmem_startup_hook = net_shmem_startup;	95✔
402
403	CurlMemContext = AllocSetContextCreate(TopMemoryContext,	95✔
404	"pg_net curl context",
405	ALLOCSET_DEFAULT_MINSIZE,
406	ALLOCSET_DEFAULT_INITSIZE,
407	ALLOCSET_DEFAULT_MAXSIZE);
408
409	DefineCustomStringVariable("pg_net.ttl",	95✔
410	"time to live for request/response rows",
411	"should be a valid interval type",
412	&guc_ttl,
413	"6 hours",
414	PGC_SIGHUP, 0,
415	NULL, NULL, NULL);
416
417	DefineCustomIntVariable("pg_net.batch_size",	95✔
418	"number of requests executed in one iteration of the background worker",
419	NULL,
420	&guc_batch_size,
421	200,
422	0, PG_INT16_MAX,
423	PGC_SIGHUP, 0,
424	NULL, NULL, NULL);
425
426	DefineCustomStringVariable("pg_net.database_name",	95✔
427	"Database where the worker will connect to",
428	NULL,
429	&guc_database_name,
430	"postgres",
431	PGC_SU_BACKEND, 0,
432	NULL, NULL, NULL);
433
434	DefineCustomStringVariable("pg_net.username",	95✔
435	"Connection user for the worker",
436	NULL,
437	&guc_username,
438	NULL,
439	PGC_SU_BACKEND, 0,
440	NULL, NULL, NULL);
441	}

supabase / pg_net / 16725696051

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