pid_t wd_hb_receiver(int fork_wait_time, WdHbIf hb_if)
{
int sock;
pid_t pid = 0;
WdHbPacket pkt;
struct timeval tv;
char from[WD_MAX_HOST_NAMELEN];
char buf[(MD5_PASSWD_LEN+1)*2];
char pack_str[WD_MAX_PACKET_STRING];
int pack_str_len;
WdInfo * p;
pid = fork();
if (pid != 0)
{
if (pid == -1)
pool_error("wd_hb_receiver: fork() failed.");
return pid;
}
if (fork_wait_time > 0)
{
sleep(fork_wait_time);
}
myargv = save_ps_display_args(myargc, myargv);
POOL_SETMASK(&UnBlockSig);
signal(SIGTERM, hb_receiver_exit);
signal(SIGINT, hb_receiver_exit);
signal(SIGQUIT, hb_receiver_exit);
signal(SIGCHLD, SIG_IGN);
signal(SIGHUP, SIG_IGN);
signal(SIGUSR1, SIG_IGN);
signal(SIGUSR2, SIG_IGN);
signal(SIGPIPE, SIG_IGN);
signal(SIGALRM, SIG_IGN);
init_ps_display("", "", "", "");
if ( (sock = wd_create_hb_recv_socket(hb_if)) < 0)
{
pool_error("wd_hb_receiver: socket create failed");
hb_receiver_exit(SIGTERM);
}
set_ps_display("heartbeat receiver", false);
for(;;)
{
if (wd_hb_recv(sock, &pkt) == WD_OK)
{
/* authentication */
if (strlen(pool_config->wd_authkey))
{
/* calculate hash from packet */
pack_str_len = packet_to_string_hb(pkt, pack_str, sizeof(pack_str));
wd_calc_hash(pack_str, pack_str_len, buf);
if (strcmp(pkt.hash, buf))
{
pool_log("wd_hb_receiver: authentication failed");
continue;
}
}
/* get current time */
gettimeofday(&tv, NULL);
/* who send this packet? */
strlcpy(from, pkt.from, sizeof(from));
p = WD_List;
while (p->status != WD_END)
{
if (!strcmp(p->hostname, from))
{
/* this is the first packet or the latest packet */
if (!WD_TIME_ISSET(p->hb_send_time) ||
WD_TIME_BEFORE(p->hb_send_time, pkt.send_time))
{
pool_debug("wd_hb_receiver: received heartbeat signal from %s", from);
p->hb_send_time = pkt.send_time;
p->hb_last_recv_time = tv;
}
break;
}
p++;
}
}
}
return pid;
}
/* fork heartbeat receiver child */
pid_t
wd_hb_receiver(int fork_wait_time, WdHbIf *hb_if)
{
int sock;
pid_t pid = 0;
WdHbPacket pkt;
struct timeval tv;
char from[WD_MAX_HOST_NAMELEN];
int from_pgpool_port;
char buf[(MD5_PASSWD_LEN+1)*2];
char pack_str[WD_MAX_PACKET_STRING];
int pack_str_len;
sigjmp_buf local_sigjmp_buf;
WdInfo * p;
pid = fork();
if (pid != 0)
{
if (pid == -1)
ereport(PANIC,
(errmsg("failed to fork a heartbeat receiver child")));
return pid;
}
on_exit_reset();
processType = PT_HB_RECEIVER;
if (fork_wait_time > 0)
{
sleep(fork_wait_time);
}
POOL_SETMASK(&UnBlockSig);
signal(SIGTERM, hb_receiver_exit);
signal(SIGINT, hb_receiver_exit);
signal(SIGQUIT, hb_receiver_exit);
signal(SIGCHLD, SIG_IGN);
signal(SIGHUP, SIG_IGN);
signal(SIGUSR1, SIG_IGN);
signal(SIGUSR2, SIG_IGN);
signal(SIGPIPE, SIG_IGN);
signal(SIGALRM, SIG_IGN);
init_ps_display("", "", "", "");
/* Create per loop iteration memory context */
ProcessLoopContext = AllocSetContextCreate(TopMemoryContext,
"wdhb_hb_receiver",
ALLOCSET_DEFAULT_MINSIZE,
ALLOCSET_DEFAULT_INITSIZE,
ALLOCSET_DEFAULT_MAXSIZE);
MemoryContextSwitchTo(TopMemoryContext);
sock = wd_create_hb_recv_socket(hb_if);
set_ps_display("heartbeat receiver", false);
if (sigsetjmp(local_sigjmp_buf, 1) != 0)
{
/* Since not using PG_TRY, must reset error stack by hand */
error_context_stack = NULL;
EmitErrorReport();
MemoryContextSwitchTo(TopMemoryContext);
FlushErrorState();
}
/* We can now handle ereport(ERROR) */
PG_exception_stack = &local_sigjmp_buf;
for(;;)
{
MemoryContextSwitchTo(ProcessLoopContext);
MemoryContextResetAndDeleteChildren(ProcessLoopContext);
/* receive heartbeat signal */
wd_hb_recv(sock, &pkt);
/* authentication */
if (strlen(pool_config->wd_authkey))
{
/* calculate hash from packet */
pack_str_len = packet_to_string_hb(&pkt, pack_str, sizeof(pack_str));
wd_calc_hash(pack_str, pack_str_len, buf);
if (strcmp(pkt.hash, buf))
ereport(ERROR,
(errmsg("watchdog heartbeat receive"),
errdetail("authentication failed")));
}
/* get current time */
gettimeofday(&tv, NULL);
/* who send this packet? */
strlcpy(from, pkt.from, sizeof(from));
from_pgpool_port = pkt.from_pgpool_port;
p = WD_List;
while (p->status != WD_END)
{
if (!strcmp(p->hostname, from) && p->pgpool_port == from_pgpool_port)
{
/* ignore the packet from down pgpool */
if (pkt.status == WD_DOWN)
{
ereport(DEBUG1,
(errmsg("watchdog heartbeat: received heartbeat signal from \"%s:%d\" whose status is down. ignored",
from, from_pgpool_port)));
break;
}
/* this is the first packet or the latest packet */
if (!WD_TIME_ISSET(p->hb_send_time) ||
WD_TIME_BEFORE(p->hb_send_time, pkt.send_time))
{
ereport(DEBUG1,
(errmsg("watchdog heartbeat: received heartbeat signal from \"%s:%d\"",
from, from_pgpool_port)));
p->hb_send_time = pkt.send_time;
p->hb_last_recv_time = tv;
}
else
{
ereport(DEBUG1,
(errmsg("watchdog heartbeat: received heartbeat signal is older than the latest, ignored")));
}
break;
}
p++;
}
}
return pid;
}
