void HTTPRequest::_notification(int p_what) {
if (p_what==NOTIFICATION_PROCESS) {
bool done = _update_connection();
if (done) {
set_process(false);
cancel_request();
}
}
}
void HTTPRequest::_notification(int p_what) {
if (p_what == NOTIFICATION_INTERNAL_PROCESS) {
if (use_threads)
return;
bool done = _update_connection();
if (done) {
set_process_internal(false);
//cancel_request(); called from _request done now
}
}
if (p_what == NOTIFICATION_EXIT_TREE) {
if (requesting) {
cancel_request();
}
}
}
/*
* Send extended query and wait for response
* send_type:
* -1: do not send this node_id
* 0: send to all nodes
* >0: send to this node_id
*/
POOL_STATUS pool_extended_send_and_wait(POOL_QUERY_CONTEXT *query_context,
char *kind, int len, char *contents,
int send_type, int node_id)
{
POOL_SESSION_CONTEXT *session_context;
POOL_CONNECTION *frontend;
POOL_CONNECTION_POOL *backend;
bool is_commit;
bool is_begin_read_write;
int i;
int str_len;
int rewritten_len;
char *str;
char *rewritten_begin;
session_context = pool_get_session_context();
frontend = session_context->frontend;
backend = session_context->backend;
is_commit = is_commit_or_rollback_query(query_context->parse_tree);
is_begin_read_write = false;
str_len = 0;
rewritten_len = 0;
str = NULL;
rewritten_begin = NULL;
/*
* If the query is BEGIN READ WRITE or
* BEGIN ... SERIALIZABLE in master/slave mode,
* we send BEGIN to slaves/standbys instead.
* original_query which is BEGIN READ WRITE is sent to primary.
* rewritten_query which is BEGIN is sent to standbys.
*/
if (pool_need_to_treat_as_if_default_transaction(query_context))
{
is_begin_read_write = true;
if (*kind == 'P')
{
rewritten_begin = remove_read_write(len, contents, &rewritten_len);
if (rewritten_begin == NULL)
return POOL_END;
}
}
if (!rewritten_begin)
{
str_len = len;
str = contents;
}
/* Send query */
for (i=0;i<NUM_BACKENDS;i++)
{
if (!VALID_BACKEND(i))
continue;
else if (send_type < 0 && i == node_id)
continue;
else if (send_type > 0 && i != node_id)
continue;
/*
* If in reset context, we send COMMIT/ABORT to nodes those
* are not in I(idle) state. This will ensure that
* transactions are closed.
*/
if (is_commit && session_context->reset_context && TSTATE(backend, i) == 'I')
{
pool_unset_node_to_be_sent(query_context, i);
continue;
}
if (rewritten_begin)
{
if (REAL_PRIMARY_NODE_ID == i)
{
str = contents;
str_len = len;
}
else
{
str = rewritten_begin;
str_len = rewritten_len;
}
}
if (pool_config->log_per_node_statement)
{
char msgbuf[QUERY_STRING_BUFFER_LEN];
char *stmt;
if (*kind == 'P' || *kind == 'E')
{
if (query_context->rewritten_query)
{
if (is_begin_read_write)
{
if (REAL_PRIMARY_NODE_ID == i)
stmt = query_context->original_query;
else
stmt = query_context->rewritten_query;
}
else
{
stmt = query_context->rewritten_query;
}
}
else
{
stmt = query_context->original_query;
}
if (*kind == 'P')
snprintf(msgbuf, sizeof(msgbuf), "Parse: %s", stmt);
else
snprintf(msgbuf, sizeof(msgbuf), "Execute: %s", stmt);
}
else
{
snprintf(msgbuf, sizeof(msgbuf), "%c message", *kind);
}
per_node_statement_log(backend, i, msgbuf);
}
if (send_extended_protocol_message(backend, i, kind, str_len, str) != POOL_CONTINUE)
{
free(rewritten_begin);
return POOL_END;
}
}
if (!is_begin_read_write)
{
if (query_context->rewritten_query)
str = query_context->rewritten_query;
else
str = query_context->original_query;
}
/* Wait for response */
for (i=0;i<NUM_BACKENDS;i++)
{
if (!VALID_BACKEND(i))
continue;
else if (send_type < 0 && i == node_id)
continue;
else if (send_type > 0 && i != node_id)
continue;
/*
* If in master/slave mode, we do not send COMMIT/ABORT to
* slaves/standbys if it's in I(idle) state.
*/
if (is_commit && MASTER_SLAVE && !IS_MASTER_NODE_ID(i) && TSTATE(backend, i) == 'I')
{
continue;
}
if (is_begin_read_write)
{
if (REAL_PRIMARY_NODE_ID == i)
str = query_context->original_query;
else
str = query_context->rewritten_query;
}
if (wait_for_query_response(frontend, CONNECTION(backend, i), MAJOR(backend)) != POOL_CONTINUE)
{
/* Cancel current transaction */
CancelPacket cancel_packet;
cancel_packet.protoVersion = htonl(PROTO_CANCEL);
cancel_packet.pid = MASTER_CONNECTION(backend)->pid;
cancel_packet.key= MASTER_CONNECTION(backend)->key;
cancel_request(&cancel_packet);
free(rewritten_begin);
return POOL_END;
}
/*
* Check if some error detected. If so, emit
* log. This is usefull when invalid encoding error
* occurs. In this case, PostgreSQL does not report
* what statement caused that error and make users
* confused.
*/
per_node_error_log(backend, i, str, "pool_send_and_wait: Error or notice message from backend: ", true);
}
free(rewritten_begin);
return POOL_CONTINUE;
}
/*
* Send simple query and wait for response
* send_type:
* -1: do not send this node_id
* 0: send to all nodes
* >0: send to this node_id
*/
POOL_STATUS pool_send_and_wait(POOL_QUERY_CONTEXT *query_context,
int send_type, int node_id)
{
POOL_SESSION_CONTEXT *session_context;
POOL_CONNECTION *frontend;
POOL_CONNECTION_POOL *backend;
bool is_commit;
bool is_begin_read_write;
int i;
int len;
char *string;
session_context = pool_get_session_context();
frontend = session_context->frontend;
backend = session_context->backend;
is_commit = is_commit_or_rollback_query(query_context->parse_tree);
is_begin_read_write = false;
len = 0;
string = NULL;
/*
* If the query is BEGIN READ WRITE or
* BEGIN ... SERIALIZABLE in master/slave mode,
* we send BEGIN to slaves/standbys instead.
* original_query which is BEGIN READ WRITE is sent to primary.
* rewritten_query which is BEGIN is sent to standbys.
*/
if (pool_need_to_treat_as_if_default_transaction(query_context))
{
is_begin_read_write = true;
}
else
{
if (query_context->rewritten_query)
{
len = query_context->rewritten_length;
string = query_context->rewritten_query;
}
else
{
len = query_context->original_length;
string = query_context->original_query;
}
}
/* Send query */
for (i=0;i<NUM_BACKENDS;i++)
{
if (!VALID_BACKEND(i))
continue;
else if (send_type < 0 && i == node_id)
continue;
else if (send_type > 0 && i != node_id)
continue;
/*
* If in master/slave mode, we do not send COMMIT/ABORT to
* slaves/standbys if it's in I(idle) state.
*/
if (is_commit && MASTER_SLAVE && !IS_MASTER_NODE_ID(i) && TSTATE(backend, i) == 'I')
{
pool_unset_node_to_be_sent(query_context, i);
continue;
}
/*
* If in reset context, we send COMMIT/ABORT to nodes those
* are not in I(idle) state. This will ensure that
* transactions are closed.
*/
if (is_commit && session_context->reset_context && TSTATE(backend, i) == 'I')
{
pool_unset_node_to_be_sent(query_context, i);
continue;
}
if (is_begin_read_write)
{
if (REAL_PRIMARY_NODE_ID == i)
{
len = query_context->original_length;
string = query_context->original_query;
}
else
{
len = query_context->rewritten_length;
string = query_context->rewritten_query;
}
}
per_node_statement_log(backend, i, string);
if (send_simplequery_message(CONNECTION(backend, i), len, string, MAJOR(backend)) != POOL_CONTINUE)
{
return POOL_END;
}
}
/* Wait for response */
for (i=0;i<NUM_BACKENDS;i++)
{
if (!VALID_BACKEND(i))
continue;
else if (send_type < 0 && i == node_id)
continue;
else if (send_type > 0 && i != node_id)
continue;
#ifdef NOT_USED
/*
* If in master/slave mode, we do not send COMMIT/ABORT to
* slaves/standbys if it's in I(idle) state.
*/
if (is_commit && MASTER_SLAVE && !IS_MASTER_NODE_ID(i) && TSTATE(backend, i) == 'I')
{
continue;
}
#endif
if (is_begin_read_write)
{
if(REAL_PRIMARY_NODE_ID == i)
string = query_context->original_query;
else
string = query_context->rewritten_query;
}
if (wait_for_query_response(frontend, CONNECTION(backend, i), MAJOR(backend)) != POOL_CONTINUE)
{
/* Cancel current transaction */
CancelPacket cancel_packet;
cancel_packet.protoVersion = htonl(PROTO_CANCEL);
cancel_packet.pid = MASTER_CONNECTION(backend)->pid;
cancel_packet.key= MASTER_CONNECTION(backend)->key;
cancel_request(&cancel_packet);
return POOL_END;
}
/*
* Check if some error detected. If so, emit
* log. This is usefull when invalid encoding error
* occurs. In this case, PostgreSQL does not report
* what statement caused that error and make users
* confused.
*/
per_node_error_log(backend, i, string, "pool_send_and_wait: Error or notice message from backend: ", true);
}
return POOL_CONTINUE;
}
/*
* child main loop
*/
void do_child(int unix_fd, int inet_fd)
{
POOL_CONNECTION *frontend;
POOL_CONNECTION_POOL *backend;
struct timeval now;
struct timezone tz;
struct timeval timeout;
static int connected; /* non 0 if has been accepted connections from frontend */
int connections_count = 0; /* used if child_max_connections > 0 */
int found;
char psbuf[NI_MAXHOST + 128];
pool_debug("I am %d", getpid());
/* Identify myself via ps */
init_ps_display("", "", "", "");
/* set up signal handlers */
signal(SIGALRM, SIG_DFL);
signal(SIGTERM, die);
signal(SIGINT, die);
signal(SIGHUP, reload_config_handler);
signal(SIGQUIT, die);
signal(SIGCHLD, SIG_DFL);
signal(SIGUSR1, close_idle_connection);
signal(SIGUSR2, wakeup_handler);
signal(SIGPIPE, SIG_IGN);
#ifdef NONE_BLOCK
/* set listen fds to none-blocking */
pool_set_nonblock(unix_fd);
if (inet_fd)
{
pool_set_nonblock(inet_fd);
}
#endif
/* Initialize my backend status */
pool_initialize_private_backend_status();
/* Initialize per process context */
pool_init_process_context();
/* initialize random seed */
gettimeofday(&now, &tz);
#if defined(sun) || defined(__sun)
srand((unsigned int) now.tv_usec);
#else
srandom((unsigned int) now.tv_usec);
#endif
/* initialize system db connection */
init_system_db_connection();
/* initialize connection pool */
if (pool_init_cp())
{
child_exit(1);
}
/*
* Open pool_passwd in child process. This is necessary to avoid the
* file descriptor race condition reported in [pgpool-general: 1141].
*/
if (strcmp("", pool_config->pool_passwd))
{
pool_reopen_passwd_file();
}
timeout.tv_sec = pool_config->child_life_time;
timeout.tv_usec = 0;
for (;;)
{
StartupPacket *sp;
idle = 1;
/* pgpool stop request already sent? */
check_stop_request();
/* Check if restart request is set because of failback event
* happend. If so, exit myself with exit code 1 to be
* restarted by pgpool parent.
*/
if (pool_get_my_process_info()->need_to_restart)
{
pool_log("do_child: failback event found. restart myself.");
pool_get_my_process_info()->need_to_restart = 0;
child_exit(1);
}
accepted = 0;
/* perform accept() */
frontend = do_accept(unix_fd, inet_fd, &timeout);
if (frontend == NULL) /* connection request from frontend timed out */
{
/* check select() timeout */
if (connected && pool_config->child_life_time > 0 &&
timeout.tv_sec == 0 && timeout.tv_usec == 0)
{
pool_debug("child life %d seconds expired", pool_config->child_life_time);
/*
* Doesn't need to call this. child_exit() calls it.
* send_frontend_exits();
*/
child_exit(2);
}
continue;
}
/* set frontend fd to blocking */
pool_unset_nonblock(frontend->fd);
/* reset busy flag */
idle = 0;
/* check backend timer is expired */
if (backend_timer_expired)
{
pool_backend_timer();
backend_timer_expired = 0;
}
/* read the startup packet */
retry_startup:
sp = read_startup_packet(frontend);
if (sp == NULL)
{
/* failed to read the startup packet. return to the accept() loop */
pool_close(frontend);
connection_count_down();
continue;
}
/* cancel request? */
if (sp->major == 1234 && sp->minor == 5678)
{
cancel_request((CancelPacket *)sp->startup_packet);
pool_close(frontend);
pool_free_startup_packet(sp);
connection_count_down();
continue;
}
/* SSL? */
if (sp->major == 1234 && sp->minor == 5679 && !frontend->ssl_active)
{
pool_debug("SSLRequest from client");
pool_ssl_negotiate_serverclient(frontend);
goto retry_startup;
}
if (pool_config->enable_pool_hba)
{
/*
* do client authentication.
* Note that ClientAuthentication does not return if frontend
* was rejected; it simply terminates this process.
*/
frontend->protoVersion = sp->major;
frontend->database = strdup(sp->database);
if (frontend->database == NULL)
{
pool_error("do_child: strdup failed: %s\n", strerror(errno));
child_exit(1);
}
frontend->username = strdup(sp->user);
if (frontend->username == NULL)
{
pool_error("do_child: strdup failed: %s\n", strerror(errno));
child_exit(1);
}
ClientAuthentication(frontend);
}
/*
* Ok, negotiation with frontend has been done. Let's go to the
* next step. Connect to backend if there's no existing
* connection which can be reused by this frontend.
* Authentication is also done in this step.
*/
/* Check if restart request is set because of failback event
* happend. If so, close idle connections to backend and make
* a new copy of backend status.
*/
if (pool_get_my_process_info()->need_to_restart)
{
pool_log("do_child: failback event found. discard existing connections");
pool_get_my_process_info()->need_to_restart = 0;
close_idle_connection(0);
pool_initialize_private_backend_status();
}
/*
* if there's no connection associated with user and database,
* we need to connect to the backend and send the startup packet.
*/
/* look for existing connection */
found = 0;
backend = pool_get_cp(sp->user, sp->database, sp->major, 1);
if (backend != NULL)
{
found = 1;
/* existing connection associated with same user/database/major found.
* however we should make sure that the startup packet contents are identical.
* OPTION data and others might be different.
*/
if (sp->len != MASTER_CONNECTION(backend)->sp->len)
{
pool_debug("do_child: connection exists but startup packet length is not identical");
found = 0;
}
else if(memcmp(sp->startup_packet, MASTER_CONNECTION(backend)->sp->startup_packet, sp->len) != 0)
{
pool_debug("do_child: connection exists but startup packet contents is not identical");
found = 0;
}
if (found == 0)
{
/* we need to discard existing connection since startup packet is different */
pool_discard_cp(sp->user, sp->database, sp->major);
backend = NULL;
}
}
if (backend == NULL)
{
/* create a new connection to backend */
if ((backend = connect_backend(sp, frontend)) == NULL)
{
connection_count_down();
continue;
}
}
else
{
/* reuse existing connection */
if (!connect_using_existing_connection(frontend, backend, sp))
continue;
}
connected = 1;
/* show ps status */
sp = MASTER_CONNECTION(backend)->sp;
snprintf(psbuf, sizeof(psbuf), "%s %s %s idle",
sp->user, sp->database, remote_ps_data);
set_ps_display(psbuf, false);
/*
* Initialize per session context
*/
pool_init_session_context(frontend, backend);
/* Mark this connection pool is connected from frontend */
pool_coninfo_set_frontend_connected(pool_get_process_context()->proc_id, pool_pool_index());
/* query process loop */
for (;;)
{
POOL_STATUS status;
status = pool_process_query(frontend, backend, 0);
sp = MASTER_CONNECTION(backend)->sp;
switch (status)
{
/* client exits */
case POOL_END:
/*
* do not cache connection if:
* pool_config->connection_cahe == 0 or
* database name is template0, template1, postgres or regression
*/
if (pool_config->connection_cache == 0 ||
!strcmp(sp->database, "template0") ||
!strcmp(sp->database, "template1") ||
!strcmp(sp->database, "postgres") ||
!strcmp(sp->database, "regression"))
{
reset_connection();
pool_close(frontend);
pool_send_frontend_exits(backend);
pool_discard_cp(sp->user, sp->database, sp->major);
}
else
{
POOL_STATUS status1;
/* send reset request to backend */
status1 = pool_process_query(frontend, backend, 1);
pool_close(frontend);
/* if we detect errors on resetting connection, we need to discard
* this connection since it might be in unknown status
*/
if (status1 != POOL_CONTINUE)
{
pool_debug("error in resetting connections. discarding connection pools...");
pool_send_frontend_exits(backend);
pool_discard_cp(sp->user, sp->database, sp->major);
}
else
pool_connection_pool_timer(backend);
}
break;
/* error occurred. discard backend connection pool
and disconnect connection to the frontend */
case POOL_ERROR:
pool_log("do_child: exits with status 1 due to error");
child_exit(1);
break;
/* fatal error occurred. just exit myself... */
case POOL_FATAL:
notice_backend_error(1);
child_exit(1);
break;
/* not implemented yet */
case POOL_IDLE:
do_accept(unix_fd, inet_fd, &timeout);
pool_debug("accept while idle");
break;
default:
break;
}
if (status != POOL_CONTINUE)
break;
}
/* Destroy session context */
pool_session_context_destroy();
/* Mark this connection pool is not connected from frontend */
pool_coninfo_unset_frontend_connected(pool_get_process_context()->proc_id, pool_pool_index());
accepted = 0;
connection_count_down();
timeout.tv_sec = pool_config->child_life_time;
timeout.tv_usec = 0;
/* increment queries counter if necessary */
if ( pool_config->child_max_connections > 0 )
connections_count++;
/* check if maximum connections count for this child reached */
if ( ( pool_config->child_max_connections > 0 ) &&
( connections_count >= pool_config->child_max_connections ) )
{
pool_log("child exiting, %d connections reached", pool_config->child_max_connections);
send_frontend_exits();
child_exit(2);
}
}
child_exit(0);
}
void HTTPRequest::_request_done(int p_status, int p_code, const PoolStringArray &headers, const PoolByteArray &p_data) {
cancel_request();
emit_signal("request_completed", p_status, p_code, headers, p_data);
}
