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Use a non blocking connect with a 1 second select timeout when initiating stratum to allow us to iterate over all IPs returned by getaddrinfo in round robin DNS pools.

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This commit is contained in:
Con Kolivas 2013-10-31 15:07:26 +11:00
parent 774061e3f2
commit eaaf34a19d
1 changed files with 65 additions and 1 deletions
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66
util.c
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@ -2045,6 +2045,40 @@ static bool socks4_negotiate(struct pool *pool, int sockd, bool socks4a)
return true;
}
static void noblock_socket(SOCKETTYPE fd)
{
#ifndef WIN32
int flags = fcntl(fd, F_GETFL, 0);
fcntl(fd, F_SETFL, O_NONBLOCK | flags);
#else
u_long flags = 1;
ioctlsocket(fd, FIONBIO, &flags);
#endif
}
static void block_socket(SOCKETTYPE fd)
{
#ifndef WIN32
int flags = fcntl(fd, F_GETFL, 0);
fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
#else
u_long flags = 0;
ioctlsocket(fd, FIONBIO, &flags);
#endif
}
static bool sock_connecting(void)
{
#ifndef WIN32
return errno == EINPROGRESS;
#else
return WSAGetLastError() == WSAEWOULDBLOCK;
#endif
}
static bool setup_stratum_socket(struct pool *pool)
{
struct addrinfo servinfobase, *servinfo, *hints, *p;
@ -2096,11 +2130,41 @@ static bool setup_stratum_socket(struct pool *pool)
continue;
}
/* Iterate non blocking over entries returned by getaddrinfo
* to cope with round robin DNS entries, finding the first one
* we can connect to quickly. */
noblock_socket(sockd);
if (connect(sockd, p->ai_addr, p->ai_addrlen) == -1) {
struct timeval tv_timeout = {1, 0};
int selret;
fd_set rw;
if (!sock_connecting()) {
CLOSESOCKET(sockd);
applog(LOG_DEBUG, "Failed connect");
applog(LOG_DEBUG, "Failed sock connect");
continue;
}
FD_ZERO(&rw);
FD_SET(sockd, &rw);
selret = select(sockd + 1, NULL, &rw, NULL, &tv_timeout);
if (selret > 0 && FD_ISSET(sockd, &rw)) {
socklen_t len;
int err, n;
len = sizeof(err);
n = getsockopt(sockd, SOL_SOCKET, SO_ERROR, (void *)&err, &len);
if (!n && !err) {
applog(LOG_DEBUG, "Succeeded delayed connect");
block_socket(sockd);
break;
}
}
CLOSESOCKET(sockd);
applog(LOG_DEBUG, "Select timeout/failed connect");
continue;
}
applog(LOG_WARNING, "Succeeded immediate connect");
block_socket(sockd);
break;
}