Merge branch 'master' of https://bitbucket.org/ckolivas/ckpool

src/ckpool.c

@@ -527,7 +527,7 @@ rewait:
 		ret = 0;
 		goto out;
 	}
-	ret = wait_read_select(cs->fd, eom ? 0 : *timeout);
+	ret = wait_recv_select(cs->fd, eom ? 0 : *timeout);
 	if (ret < 1) {
 		if (!ret) {
 			if (eom)

src/ckpool.h

@@ -111,6 +111,7 @@ struct server_instance {
 	char *auth;
 	char *pass;
 	bool notify;
+	bool alive;
 	connsock_t cs;
 
 	void *data; // Private data

src/generator.c

@@ -147,6 +147,7 @@ static bool server_alive(ckpool_t *ckp, server_instance_t *si, bool pinging)
 	/* Has this server already been reconnected? */
 	if (cs->fd > 0)
 		return true;
+	si->alive = false;
 	if (!extract_sockaddr(si->url, &cs->url, &cs->port)) {
 		LOGWARNING("Failed to extract address from %s", si->url);
 		return ret;
@@ -189,6 +190,7 @@ out:
 		/* Close and invalidate the file handle */
 		Close(cs->fd);
 	} else {
+		si->alive = true;
 		LOGNOTICE("Server alive: %s:%s", cs->url, cs->port);
 		keep_sockalive(cs->fd);
 	}
@@ -207,19 +209,31 @@ retry:
 	if (!ping_main(ckp))
 		goto out;
 
+	/* First find a server that is already flagged alive if possible
+	 * without blocking on server_alive() */
+	for (i = 0; i < ckp->btcds; i++) {
+		server_instance_t *si = ckp->servers[i];
+		cs = &si->cs;
+
+		if (si->alive && cs->fd > 0) {
+			alive = si;
+			goto living;
+		}
+	}
+
+	/* No servers flagged alive, try to connect to them blocking */
 	for (i = 0; i < ckp->btcds; i++) {
 		server_instance_t *si = ckp->servers[i];
 
 		if (server_alive(ckp, si, false)) {
 			alive = si;
-			break;
+			goto living;
 		}
 	}
-	if (!alive) {
 	LOGWARNING("CRITICAL: No bitcoinds active!");
 	sleep(5);
 	goto retry;
-	}
+living:
 	cs = &alive->cs;
 	LOGINFO("Connected to live server %s:%s", cs->url, cs->port);
 out:
@@ -276,7 +290,7 @@ retry:
 	ckmsgq_add(gdata->srvchk, si);
 
 	do {
-		selret = wait_read_select(us->sockd, 5);
+		selret = wait_recv_select(us->sockd, 5);
 		if (!selret && !ping_main(ckp)) {
 			LOGEMERG("Generator failed to ping main process, exiting");
 			ret = 1;
@@ -1618,7 +1632,7 @@ retry:
 	ckmsgq_add(gdata->srvchk, proxi->si);
 
 	do {
-		selret = wait_read_select(us->sockd, 5);
+		selret = wait_recv_select(us->sockd, 5);
 		if (!selret && !ping_main(ckp)) {
 			LOGEMERG("Generator failed to ping main process, exiting");
 			ret = 1;

src/libckpool.c

@@ -758,17 +758,15 @@ out:
 
 void empty_socket(int fd)
 {
+	char buf[PAGESIZE];
 	int ret;
 
 	if (fd < 1)
 		return;
 
 	do {
-		char buf[PAGESIZE];
-
-		ret = wait_read_select(fd, 0);
+		ret = recv(fd, buf, PAGESIZE - 1, MSG_DONTWAIT);
 		if (ret > 0) {
-			ret = recv(fd, buf, PAGESIZE - 1, 0);
 			buf[ret] = 0;
 			LOGDEBUG("Discarding: %s", buf);
 		}
@@ -907,21 +905,39 @@ int wait_close(int sockd, int timeout)
 	return sfd.revents & (POLLHUP | POLLRDHUP | POLLERR);
 }
 
-/* Emulate a select read wait for high fds that select doesn't support */
-int wait_read_select(int sockd, float timeout)
+/* Emulate a select read wait for high fds that select doesn't support.
+ * wait_read_select is for unix sockets and _wait_recv_select for regular
+ * sockets. */
+int _wait_read_select(int *sockd, float timeout)
 {
 	struct pollfd sfd;
 	int ret = -1;
 
-	if (unlikely(sockd < 0))
+	if (unlikely(*sockd < 0))
 		goto out;
-	sfd.fd = sockd;
+	sfd.fd = *sockd;
 	sfd.events = POLLIN | POLLRDHUP;
-	sfd.revents = 0;
 	timeout *= 1000;
 	ret = poll(&sfd, 1, timeout);
-	if (ret && !(sfd.revents & POLLIN))
-		ret = -1;
+	if (ret > 0 && sfd.revents & (POLLERR))
+		_Close(sockd);
+out:
+	return ret;
+}
+
+int _wait_recv_select(int *sockd, float timeout)
+{
+	struct pollfd sfd;
+	int ret = -1;
+
+	if (unlikely(*sockd < 0))
+		goto out;
+	sfd.fd = *sockd;
+	sfd.events = POLLIN | POLLRDHUP;
+	timeout *= 1000;
+	ret = poll(&sfd, 1, timeout);
+	if (ret > 0 && sfd.revents & (POLLHUP | POLLRDHUP | POLLERR))
+		_Close(sockd);
 out:
 	return ret;
 }

src/libckpool.h

@@ -496,7 +496,10 @@ int _open_unix_server(const char *server_path, const char *file, const char *fun
 int _open_unix_client(const char *server_path, const char *file, const char *func, const int line);
 #define open_unix_client(server_path) _open_unix_client(server_path, __FILE__, __func__, __LINE__)
 int wait_close(int sockd, int timeout);
-int wait_read_select(int sockd, float timeout);
+int _wait_read_select(int *sockd, float timeout);
+#define wait_read_select(SOCKD, TIMEOUT) _wait_read_select(&(SOCKD), TIMEOUT)
+int _wait_recv_select(int *sockd, float timeout);
+#define wait_recv_select(SOCKD, TIMEOUT) _wait_recv_select(&(SOCKD), TIMEOUT)
 int read_length(int sockd, void *buf, int len);
 char *_recv_unix_msg(int sockd, int timeout1, int timeout2, const char *file, const char *func, const int line);
 #define RECV_UNIX_TIMEOUT1 30