+/* LibMemcached
+ * Copyright (C) 2006-2010 Brian Aker
+ * All rights reserved.
+ *
+ * Use and distribution licensed under the BSD license. See
+ * the COPYING file in the parent directory for full text.
+ *
+ * Summary: Server IO, Not public!
+ *
+ */
+
#include "common.h"
#include <netdb.h>
#include <poll.h>
#include <sys/time.h>
+#include <time.h>
+
+static memcached_return_t connect_poll(memcached_server_st *ptr)
+{
+ struct pollfd fds[1];
+ fds[0].fd = ptr->fd;
+ fds[0].events = POLLOUT;
+
+ int timeout= ptr->root->connect_timeout;
+ if (ptr->root->flags.no_block == true)
+ timeout= -1;
+
+ int error;
+ size_t loop_max= 5;
+
+ while (--loop_max) // Should only loop on cases of ERESTART or EINTR
+ {
+ error= poll(fds, 1, timeout);
+
+ switch (error)
+ {
+ case 1:
+ {
+ int err;
+ socklen_t len= sizeof (err);
+ (void)getsockopt(ptr->fd, SOL_SOCKET, SO_ERROR, &err, &len);
+
+ // We check the value to see what happened wth the socket.
+ if (err == 0)
+ {
+ return MEMCACHED_SUCCESS;
+ }
+ else
+ {
+ ptr->cached_errno= errno;
+
+ return MEMCACHED_ERRNO;
+ }
+ }
+ case 0:
+ return MEMCACHED_TIMEOUT;
+ default: // A real error occurred and we need to completely bail
+ WATCHPOINT_ERRNO(errno);
+ switch (errno)
+ {
+#ifdef TARGET_OS_LINUX
+ case ERESTART:
+#endif
+ case EINTR:
+ continue;
+ default:
+ if (fds[0].revents & POLLERR)
+ {
+ int err;
+ socklen_t len= sizeof (err);
+ (void)getsockopt(ptr->fd, SOL_SOCKET, SO_ERROR, &err, &len);
+ ptr->cached_errno= (err == 0) ? errno : err;
+ }
+ else
+ {
+ ptr->cached_errno= errno;
+ }
+
+ (void)close(ptr->fd);
+ ptr->fd= -1;
+
+ return MEMCACHED_ERRNO;
+ }
+ }
+ WATCHPOINT_ASSERT(0); // Programming error
+ }
+
+ // This should only be possible from ERESTART or EINTR;
+ ptr->cached_errno= errno;
+
+ return MEMCACHED_ERRNO;
+}
static memcached_return_t set_hostinfo(memcached_server_st *server)
{
struct addrinfo *ai;
struct addrinfo hints;
- int e;
char str_port[NI_MAXSERV];
+ uint32_t counter= 5;
snprintf(str_port, NI_MAXSERV, "%u", (uint32_t)server->port);
hints.ai_protocol= IPPROTO_TCP;
}
- e= getaddrinfo(server->hostname, str_port, &hints, &ai);
- if (e != 0)
+ while (--counter)
{
- WATCHPOINT_STRING(server->hostname);
- WATCHPOINT_STRING(gai_strerror(e));
- return MEMCACHED_HOST_LOOKUP_FAILURE;
+ int e= getaddrinfo(server->hostname, str_port, &hints, &ai);
+
+ if (e == 0)
+ {
+ break;
+ }
+ else if (e == EAI_AGAIN)
+ {
+ struct timespec dream, rem;
+
+ dream.tv_nsec= 1000;
+ dream.tv_sec= 0;
+
+ nanosleep(&dream, &rem);
+
+ continue;
+ }
+ else
+ {
+ WATCHPOINT_STRING(server->hostname);
+ WATCHPOINT_STRING(gai_strerror(e));
+ return MEMCACHED_HOST_LOOKUP_FAILURE;
+ }
}
if (server->address_info)
}
#endif
+
+#if defined(__MACH__) && defined(__APPLE__) || defined(__FreeBSD__)
+ {
+ int set = 1;
+ int error= setsockopt(ptr->fd, SOL_SOCKET, SO_NOSIGPIPE, (void *)&set, sizeof(int));
+
+ // This is not considered a fatal error
+ if (error == -1)
+ {
+ WATCHPOINT_ERRNO(errno);
+ perror("setsockopt(SO_NOSIGPIPE)");
+ }
+ }
+#endif
+
if (ptr->root->flags.no_block)
{
int error;
}
WATCHPOINT_ASSERT(ptr->fd != -1);
+
return MEMCACHED_SUCCESS;
}
static memcached_return_t network_connect(memcached_server_st *ptr)
{
+ bool timeout_error_occured= false;
+
if (ptr->fd == -1)
{
struct addrinfo *use;
(void)set_socket_options(ptr);
/* connect to server */
- while (ptr->fd != -1 &&
- connect(ptr->fd, use->ai_addr, use->ai_addrlen) < 0)
+ if ((connect(ptr->fd, use->ai_addr, use->ai_addrlen) > -1))
{
- ptr->cached_errno= errno;
- if (errno == EINPROGRESS || /* nonblocking mode - first return, */
- errno == EALREADY) /* nonblocking mode - subsequent returns */
- {
- struct pollfd fds[1];
- fds[0].fd = ptr->fd;
- fds[0].events = POLLOUT;
- int error= poll(fds, 1, ptr->root->connect_timeout);
-
- if (error != 1 || fds[0].revents & POLLERR)
- {
- if (fds[0].revents & POLLERR)
- {
- int err;
- socklen_t len = sizeof (err);
- (void)getsockopt(ptr->fd, SOL_SOCKET, SO_ERROR, &err, &len);
- ptr->cached_errno= (err == 0) ? errno : err;
- }
-
- (void)close(ptr->fd);
- ptr->fd= -1;
- }
- }
- else if (errno == EISCONN) /* we are connected :-) */
- {
- break;
- }
- else if (errno != EINTR)
- {
- (void)close(ptr->fd);
- ptr->fd= -1;
- break;
- }
+ break; // Success
}
- if (ptr->fd != -1)
+ /* An error occurred */
+ ptr->cached_errno= errno;
+ if (errno == EINPROGRESS || /* nonblocking mode - first return, */
+ errno == EALREADY) /* nonblocking mode - subsequent returns */
{
- ptr->server_failure_counter= 0;
- return MEMCACHED_SUCCESS;
+ memcached_return_t rc;
+ rc= connect_poll(ptr);
+
+ if (rc == MEMCACHED_TIMEOUT)
+ timeout_error_occured= true;
+
+ if (rc == MEMCACHED_SUCCESS)
+ break;
}
- use = use->ai_next;
+ else if (errno == EISCONN) /* we are connected :-) */
+ {
+ break;
+ }
+ else if (errno == EINTR) // Special case, we retry ai_addr
+ {
+ (void)close(ptr->fd);
+ ptr->fd= -1;
+ continue;
+ }
+
+ (void)close(ptr->fd);
+ ptr->fd= -1;
+ use= use->ai_next;
}
}
if (ptr->fd == -1)
{
+ WATCHPOINT_STRING("Never got a good file descriptor");
+
/* Failed to connect. schedule next retry */
if (ptr->root->retry_timeout)
{
if (gettimeofday(&next_time, NULL) == 0)
ptr->next_retry= next_time.tv_sec + ptr->root->retry_timeout;
}
- ptr->server_failure_counter++;
- if (ptr->cached_errno == 0)
+
+ if (timeout_error_occured)
return MEMCACHED_TIMEOUT;
return MEMCACHED_ERRNO; /* The last error should be from connect() */
}
- ptr->server_failure_counter= 0;
return MEMCACHED_SUCCESS; /* The last error should be from connect() */
}
+void set_last_disconnected_host(memcached_server_write_instance_st ptr)
+{
+ // const_cast
+ memcached_st *root= (memcached_st *)ptr->root;
+
+#if 0
+ WATCHPOINT_STRING(ptr->hostname);
+ WATCHPOINT_NUMBER(ptr->port);
+ WATCHPOINT_ERRNO(ptr->cached_errno);
+#endif
+ if (root->last_disconnected_server)
+ memcached_server_free(root->last_disconnected_server);
+ root->last_disconnected_server= memcached_server_clone(NULL, ptr);
+}
memcached_return_t memcached_connect(memcached_server_write_instance_st ptr)
{
/* both retry_timeout and server_failure_limit must be set in order to delay retrying a server on error. */
WATCHPOINT_ASSERT(ptr->root);
- if (ptr->root->retry_timeout && ptr->root->server_failure_limit)
+ if (ptr->root->retry_timeout && ptr->next_retry)
{
struct timeval curr_time;
gettimeofday(&curr_time, NULL);
- /* if we've had too many consecutive errors on this server, mark it dead. */
- if (ptr->server_failure_counter >= ptr->root->server_failure_limit)
+ // We should optimize this to remove the allocation if the server was
+ // the last server to die
+ if (ptr->next_retry > curr_time.tv_sec)
{
- ptr->next_retry= curr_time.tv_sec + ptr->root->retry_timeout;
- ptr->server_failure_counter= 0;
- }
+ set_last_disconnected_host(ptr);
- if (curr_time.tv_sec < ptr->next_retry)
- {
- memcached_st *root= (memcached_st *)ptr->root;
- // @todo fix this by fixing behavior to no longer make use of
- // memcached_st
- if (memcached_behavior_get(root, MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS))
- {
- run_distribution(root);
- }
+ return MEMCACHED_SERVER_MARKED_DEAD;
+ }
+ }
- root->last_disconnected_server = ptr;
+ // If we are over the counter failure, we just fail. Reject host only
+ // works if you have a set number of failures.
+ if (ptr->root->server_failure_limit && ptr->server_failure_counter >= ptr->root->server_failure_limit)
+ {
+ set_last_disconnected_host(ptr);
- return MEMCACHED_SERVER_MARKED_DEAD;
+ // @todo fix this by fixing behavior to no longer make use of
+ // memcached_st
+ if (_is_auto_eject_host(ptr->root))
+ {
+ run_distribution((memcached_st *)ptr->root);
}
+
+ return MEMCACHED_SERVER_MARKED_DEAD;
}
/* We need to clean up the multi startup piece */
case MEMCACHED_CONNECTION_UDP:
case MEMCACHED_CONNECTION_TCP:
rc= network_connect(ptr);
+#ifdef LIBMEMCACHED_WITH_SASL_SUPPORT
+ if (ptr->fd != -1 && ptr->root->sasl && ptr->root->sasl->callbacks)
+ {
+ rc= memcached_sasl_authenticate_connection(ptr);
+ if (rc != MEMCACHED_SUCCESS)
+ {
+ (void)close(ptr->fd);
+ ptr->fd= -1;
+ }
+ }
+#endif
break;
case MEMCACHED_CONNECTION_UNIX_SOCKET:
rc= unix_socket_connect(ptr);
WATCHPOINT_ASSERT(0);
}
- unlikely ( rc != MEMCACHED_SUCCESS)
+ if (rc == MEMCACHED_SUCCESS)
+ {
+ ptr->server_failure_counter= 0;
+ ptr->next_retry= 0;
+ }
+ else
{
- //@todo create interface around last_discontected_server
- memcached_st *root= (memcached_st *)ptr->root;
- root->last_disconnected_server = ptr;
+ ptr->server_failure_counter++;
+
+ set_last_disconnected_host(ptr);
}
LIBMEMCACHED_MEMCACHED_CONNECT_END();
projects / m6w6 / libmemcached / blobdiff