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diff --git a/src/frontend/sock.c b/src/frontend/sock.c
index 3662a2650cc41d313ea5c6e8613c59810825fd50..0c4829e2efc4d3737fb9cf4a5f21cf3df5fa59b5 100644 (file)
--- a/src/frontend/sock.c
+++ b/src/frontend/sock.c
*/
#include "sysdb.h"
-#include "core/error.h"
#include "core/object.h"
+#include "frontend/connection-private.h"
#include "frontend/sock.h"
#include "utils/channel.h"
+#include "utils/error.h"
#include "utils/llist.h"
+#include "utils/strbuf.h"
#include <assert.h>
-
#include <errno.h>
#include <stdio.h>
#include <pthread.h>
-/* name of connection objects */
-#define CONN_FD_PREFIX "conn#"
-#define CONN_FD_PLACEHOLDER "XXXXXXX"
-
/*
* private data types
*/
-typedef struct {
- int fd;
- struct sockaddr_storage client_addr;
- socklen_t client_addr_len;
-} connection_t;
-
-typedef struct {
- sdb_object_t super;
- connection_t conn;
-} connection_obj_t;
-#define CONN(obj) ((connection_obj_t *)(obj))
-
typedef struct {
char *address;
int type;
const char *prefix;
int (*opener)(listener_t *);
+ void (*closer)(listener_t *);
} fe_listener_impl_t;
struct sdb_fe_socket {
size_t listeners_num;
sdb_llist_t *open_connections;
+
+ /* channel used for communication between main
+ * and connection handler threads */
+ sdb_channel_t *chan;
};
/*
strncpy(sa.sun_path, listener->address + strlen("unix:"),
sizeof(sa.sun_path));
+ if (unlink(listener->address + strlen("unix:")) && (errno != ENOENT)) {
+ char errbuf[1024];
+ sdb_log(SDB_LOG_WARNING, "frontend: Failed to remove stale UNIX "
+ "socket %s: %s", listener->address + strlen("unix:"),
+ sdb_strerror(errno, errbuf, sizeof(errbuf)));
+ }
+
status = bind(listener->sock_fd, (struct sockaddr *)&sa, sizeof(sa));
if (status) {
char buf[1024];
return 0;
} /* open_unix_sock */
+static void
+close_unix_sock(listener_t *listener)
+{
+ assert(listener);
+ if (! listener->address)
+ return;
+
+ if (listener->sock_fd >= 0)
+ close(listener->sock_fd);
+ listener->sock_fd = -1;
+
+ unlink(listener->address + strlen("unix:"));
+} /* close_unix_sock */
+
/*
* private variables
*/
LISTENER_UNIXSOCK = 0,
};
static fe_listener_impl_t listener_impls[] = {
- { LISTENER_UNIXSOCK, "unix", open_unix_sock },
+ { LISTENER_UNIXSOCK, "unix", open_unix_sock, close_unix_sock },
};
/*
* private helper functions
*/
+static int
+listener_listen(listener_t *listener)
+{
+ assert(listener);
+
+ /* try to reopen */
+ if (listener->sock_fd < 0)
+ if (listener_impls[listener->type].opener(listener))
+ return -1;
+ assert(listener->sock_fd >= 0);
+
+ if (listen(listener->sock_fd, /* backlog = */ 32)) {
+ char buf[1024];
+ sdb_log(SDB_LOG_ERR, "frontend: Failed to listen on socket %s: %s",
+ listener->address, sdb_strerror(errno, buf, sizeof(buf)));
+ return -1;
+ }
+ return 0;
+} /* listener_listen */
+
+static void
+listener_close(listener_t *listener)
+{
+ assert(listener);
+
+ if (listener_impls[listener->type].closer)
+ listener_impls[listener->type].closer(listener);
+
+ if (listener->sock_fd >= 0)
+ close(listener->sock_fd);
+ listener->sock_fd = -1;
+} /* listener_close */
+
static int
get_type(const char *address)
{
if (! listener)
return;
- if (listener->sock_fd >= 0)
- close(listener->sock_fd);
+ listener_close(listener);
if (listener->address)
free(listener->address);
+ listener->address = NULL;
} /* listener_destroy */
static listener_t *
return listener;
} /* listener_create */
-/*
- * private data types
- */
-
-static int
-connection_init(sdb_object_t *obj, va_list ap)
-{
- connection_t *conn;
- int sock_fd;
-
- assert(obj);
- conn = &CONN(obj)->conn;
-
- sock_fd = va_arg(ap, int);
-
- conn->client_addr_len = sizeof(conn->client_addr);
- conn->fd = accept(sock_fd, (struct sockaddr *)&conn->client_addr,
- &conn->client_addr_len);
-
- if (conn->fd < 0) {
- char buf[1024];
- sdb_log(SDB_LOG_ERR, "frontend: Failed to accept remote "
- "connection: %s", sdb_strerror(errno,
- buf, sizeof(buf)));
- return -1;
- }
-
- if (conn->client_addr.ss_family != AF_UNIX) {
- sdb_log(SDB_LOG_ERR, "frontend: Accepted connection using "
- "unexpected family type %d", conn->client_addr.ss_family);
- return -1;
- }
-
- sdb_log(SDB_LOG_DEBUG, "frontend: Accepted connection on fd=%i\n",
- conn->fd);
-
- /* update the object name */
- snprintf(obj->name + strlen(CONN_FD_PREFIX),
- strlen(CONN_FD_PLACEHOLDER), "%i", conn->fd);
- return 0;
-} /* connection_init */
-
static void
-connection_destroy(sdb_object_t *obj)
+socket_close(sdb_fe_socket_t *sock)
{
- connection_t *conn;
-
- assert(obj);
- conn = &CONN(obj)->conn;
-
- close(conn->fd);
- conn->fd = -1;
-} /* connection_destroy */
+ size_t i;
-static sdb_type_t connection_type = {
- /* size = */ sizeof(connection_obj_t),
- /* init = */ connection_init,
- /* destroy = */ connection_destroy,
-};
+ assert(sock);
+ for (i = 0; i < sock->listeners_num; ++i)
+ listener_close(sock->listeners + i);
+} /* socket_close */
/*
* connection handler functions
static void *
connection_handler(void *data)
{
- sdb_channel_t *chan = data;
+ sdb_fe_socket_t *sock = data;
- assert(chan);
+ assert(sock);
while (42) {
struct timespec timeout = { 0, 500000000 }; /* .5 seconds */
- connection_obj_t *conn;
+ sdb_conn_t *conn;
int status;
errno = 0;
- status = sdb_channel_select(chan, NULL, &conn, NULL, NULL, &timeout);
+ status = sdb_channel_select(sock->chan, /* read */ NULL, &conn,
+ /* write */ NULL, NULL, &timeout);
if (status) {
char buf[1024];
continue;
}
- /* XXX */
- sdb_log(SDB_LOG_INFO, "frontend: Data available on connection fd=%i\n",
- conn->conn.fd);
+ status = (int)sdb_connection_read(conn);
+ if (status <= 0) {
+ /* error or EOF -> close connection */
+ sdb_object_deref(SDB_OBJ(conn));
+ continue;
+ }
+
+ /* return the connection to the main loop */
+ if (sdb_llist_append(sock->open_connections, SDB_OBJ(conn))) {
+ sdb_log(SDB_LOG_ERR, "frontend: Failed to re-append "
+ "connection %s to list of open connections",
+ SDB_OBJ(conn)->name);
+ }
+
+ /* pass ownership back to list; or destroy in case of an error */
+ sdb_object_deref(SDB_OBJ(conn));
}
return NULL;
} /* connection_handler */
static int
-accept_connection(sdb_fe_socket_t *sock, listener_t *listener)
+connection_accept(sdb_fe_socket_t *sock, listener_t *listener)
{
sdb_object_t *obj;
+ int status;
- /* the X's will be replaced with the accepted file descriptor
- * when initializing the object */
- obj = sdb_object_create(CONN_FD_PREFIX CONN_FD_PLACEHOLDER,
- connection_type, listener->sock_fd);
+ obj = SDB_OBJ(sdb_connection_accept(listener->sock_fd));
if (! obj)
return -1;
- if (sdb_llist_append(sock->open_connections, obj)) {
+ status = sdb_llist_append(sock->open_connections, obj);
+ if (status)
sdb_log(SDB_LOG_ERR, "frontend: Failed to append "
"connection %s to list of open connections",
obj->name);
- sdb_object_deref(obj);
+
+ /* hand ownership over to the list; or destroy in case of an error */
+ sdb_object_deref(obj);
+ return status;
+} /* connection_accept */
+
+static int
+socket_handle_incoming(sdb_fe_socket_t *sock,
+ fd_set *ready, fd_set *exceptions)
+{
+ sdb_llist_iter_t *iter;
+ size_t i;
+
+ for (i = 0; i < sock->listeners_num; ++i) {
+ listener_t *listener = sock->listeners + i;
+ if (FD_ISSET(listener->sock_fd, ready))
+ if (connection_accept(sock, listener))
+ continue;
+ }
+
+ iter = sdb_llist_get_iter(sock->open_connections);
+ if (! iter) {
+ sdb_log(SDB_LOG_ERR, "frontend: Failed to acquire iterator "
+ "for open connections");
return -1;
}
- /* hand ownership over to the list */
- sdb_object_deref(obj);
+ while (sdb_llist_iter_has_next(iter)) {
+ sdb_object_t *obj = sdb_llist_iter_get_next(iter);
+
+ if (FD_ISSET(CONN(obj)->fd, exceptions))
+ sdb_log(SDB_LOG_INFO, "Exception on fd %d",
+ CONN(obj)->fd);
+
+ if (FD_ISSET(CONN(obj)->fd, ready)) {
+ sdb_llist_iter_remove_current(iter);
+ sdb_channel_write(sock->chan, &obj);
+ }
+ }
+ sdb_llist_iter_destroy(iter);
return 0;
-} /* accept_connection */
+} /* socket_handle_incoming */
/*
* public API
int
sdb_fe_sock_listen_and_serve(sdb_fe_socket_t *sock, sdb_fe_loop_t *loop)
{
- sdb_channel_t *chan;
fd_set sockets;
int max_listen_fd = 0;
size_t i;
- /* XXX: make the number of threads configurable */
- pthread_t handler_threads[5];
+ pthread_t handler_threads[loop->num_threads];
+ size_t num_threads;
- if ((! sock) || (! sock->listeners_num) || (! loop))
+ if ((! sock) || (! sock->listeners_num) || sock->chan
+ || (! loop) || (loop->num_threads <= 0))
return -1;
- FD_ZERO(&sockets);
+ if (! loop->do_loop)
+ return 0;
+ FD_ZERO(&sockets);
for (i = 0; i < sock->listeners_num; ++i) {
listener_t *listener = sock->listeners + i;
- if (listen(listener->sock_fd, /* backlog = */ 32)) {
- char buf[1024];
- sdb_log(SDB_LOG_ERR, "frontend: Failed to listen on socket %s: %s",
- listener->address, sdb_strerror(errno, buf, sizeof(buf)));
+ if (listener_listen(listener)) {
+ socket_close(sock);
return -1;
}
max_listen_fd = listener->sock_fd;
}
- chan = sdb_channel_create(1024, sizeof(connection_obj_t *));
- if (! chan)
+ sock->chan = sdb_channel_create(1024, sizeof(sdb_conn_t *));
+ if (! sock->chan) {
+ socket_close(sock);
return -1;
+ }
+ sdb_log(SDB_LOG_INFO, "frontend: Starting %d connection "
+ "handler thread%s managing %d listener%s",
+ loop->num_threads, loop->num_threads == 1 ? "" : "s",
+ sock->listeners_num, sock->listeners_num == 1 ? "" : "s");
+
+ num_threads = loop->num_threads;
memset(&handler_threads, 0, sizeof(handler_threads));
- /* XXX: error handling */
- for (i = 0; i < SDB_STATIC_ARRAY_LEN(handler_threads); ++i)
- pthread_create(&handler_threads[i], /* attr = */ NULL,
- connection_handler, /* arg = */ chan);
+ for (i = 0; i < num_threads; ++i) {
+ errno = 0;
+ if (pthread_create(&handler_threads[i], /* attr = */ NULL,
+ connection_handler, /* arg = */ sock)) {
+ char errbuf[1024];
+ sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
+ "connection handler thread: %s",
+ sdb_strerror(errno, errbuf, sizeof(errbuf)));
+ num_threads = i;
+ break;
+ }
+ }
+
+ while (loop->do_loop && num_threads) {
+ struct timeval timeout = { 1, 0 }; /* one second */
+ sdb_llist_iter_t *iter;
- while (loop->do_loop) {
+ int max_fd = max_listen_fd;
fd_set ready;
fd_set exceptions;
- int max_fd;
int n;
- struct timeval timeout = { 1, 0 }; /* one second */
- sdb_llist_iter_t *iter;
-
FD_ZERO(&ready);
FD_ZERO(&exceptions);
ready = sockets;
- max_fd = max_listen_fd;
-
iter = sdb_llist_get_iter(sock->open_connections);
if (! iter) {
sdb_log(SDB_LOG_ERR, "frontend: Failed to acquire iterator "
"for open connections");
- return -1;
+ break;
}
while (sdb_llist_iter_has_next(iter)) {
sdb_object_t *obj = sdb_llist_iter_get_next(iter);
- FD_SET(CONN(obj)->conn.fd, &ready);
- FD_SET(CONN(obj)->conn.fd, &exceptions);
+ FD_SET(CONN(obj)->fd, &ready);
+ FD_SET(CONN(obj)->fd, &exceptions);
- if (CONN(obj)->conn.fd > max_fd)
- max_fd = CONN(obj)->conn.fd;
+ if (CONN(obj)->fd > max_fd)
+ max_fd = CONN(obj)->fd;
}
sdb_llist_iter_destroy(iter);
sdb_log(SDB_LOG_ERR, "frontend: Failed to monitor sockets: %s",
sdb_strerror(errno, buf, sizeof(buf)));
- return -1;
+ break;
}
-
- if (! n)
+ else if (! n)
continue;
- for (i = 0; i < sock->listeners_num; ++i) {
- listener_t *listener = sock->listeners + i;
- if (FD_ISSET(listener->sock_fd, &ready))
- if (accept_connection(sock, listener))
- continue;
- }
-
- iter = sdb_llist_get_iter(sock->open_connections);
- if (! iter) {
- sdb_log(SDB_LOG_ERR, "frontend: Failed to acquire iterator "
- "for open connections");
- return -1;
- }
-
- while (sdb_llist_iter_has_next(iter)) {
- sdb_object_t *obj = sdb_llist_iter_get_next(iter);
-
- if (FD_ISSET(CONN(obj)->conn.fd, &exceptions))
- sdb_log(SDB_LOG_INFO, "Exception on fd %d",
- CONN(obj)->conn.fd);
-
- if (FD_ISSET(CONN(obj)->conn.fd, &ready)) {
- sdb_log(SDB_LOG_INFO, "Data on fd %d", CONN(obj)->conn.fd);
- sdb_llist_iter_remove_current(iter);
- sdb_channel_write(chan, &obj);
- }
- }
- sdb_llist_iter_destroy(iter);
+ /* handle new and open connections */
+ if (socket_handle_incoming(sock, &ready, &exceptions))
+ break;
}
+ socket_close(sock);
+
sdb_log(SDB_LOG_INFO, "frontend: Waiting for connection handler threads "
"to terminate");
- if (! sdb_channel_shutdown(chan))
- for (i = 0; i < SDB_STATIC_ARRAY_LEN(handler_threads); ++i)
+ if (! sdb_channel_shutdown(sock->chan))
+ for (i = 0; i < num_threads; ++i)
pthread_join(handler_threads[i], NULL);
/* else: we tried our best; let the operating system clean up */
+
+ sdb_channel_destroy(sock->chan);
+ sock->chan = NULL;
+
+ if (! num_threads)
+ return -1;
return 0;
} /* sdb_fe_sock_listen_and_server */