/*
- * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
- * David Goulet <dgoulet@efficios.com>
+ * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com>
+ * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
+ * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License, version 2 only, as
- * published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0-only
*
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 51
- * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#define _GNU_SOURCE
+#define _LGPL_SOURCE
#include <common/common.h>
+#include <urcu/rculist.h>
#include "connection.h"
#include "stream.h"
+#include "viewer-session.h"
-static void rcu_free_connection(struct rcu_head *head)
+bool connection_get(struct relay_connection *conn)
{
- struct relay_connection *conn =
- caa_container_of(head, struct relay_connection, rcu_node);
-
- lttcomm_destroy_sock(conn->sock);
- free(conn);
+ return urcu_ref_get_unless_zero(&conn->ref);
}
-struct relay_connection *connection_find_by_sock(struct lttng_ht *ht, int sock)
+struct relay_connection *connection_get_by_sock(struct lttng_ht *relay_connections_ht,
+ int sock)
{
struct lttng_ht_node_ulong *node;
struct lttng_ht_iter iter;
struct relay_connection *conn = NULL;
- assert(ht);
assert(sock >= 0);
- lttng_ht_lookup(ht, (void *)((unsigned long) sock), &iter);
+ rcu_read_lock();
+ lttng_ht_lookup(relay_connections_ht, (void *)((unsigned long) sock),
+ &iter);
node = lttng_ht_iter_get_node_ulong(&iter);
if (!node) {
DBG2("Relay connection by sock %d not found", sock);
goto end;
}
conn = caa_container_of(node, struct relay_connection, sock_n);
-
+ if (!connection_get(conn)) {
+ conn = NULL;
+ }
end:
+ rcu_read_unlock();
return conn;
}
-void connection_delete(struct lttng_ht *ht, struct relay_connection *conn)
+int connection_reset_protocol_state(struct relay_connection *connection)
{
- int ret;
- struct lttng_ht_iter iter;
+ int ret = 0;
+
+ switch (connection->type) {
+ case RELAY_DATA:
+ connection->protocol.data.state_id =
+ DATA_CONNECTION_STATE_RECEIVE_HEADER;
+ memset(&connection->protocol.data.state.receive_header,
+ 0,
+ sizeof(connection->protocol.data.state.receive_header));
+ connection->protocol.data.state.receive_header.left_to_receive =
+ sizeof(struct lttcomm_relayd_data_hdr);
+ break;
+ case RELAY_CONTROL:
+ connection->protocol.ctrl.state_id =
+ CTRL_CONNECTION_STATE_RECEIVE_HEADER;
+ memset(&connection->protocol.ctrl.state.receive_header,
+ 0,
+ sizeof(connection->protocol.ctrl.state.receive_header));
+ connection->protocol.data.state.receive_header.left_to_receive =
+ sizeof(struct lttcomm_relayd_hdr);
+ ret = lttng_dynamic_buffer_set_size(
+ &connection->protocol.ctrl.reception_buffer,
+ sizeof(struct lttcomm_relayd_hdr));
+ if (ret) {
+ ERR("Failed to reinitialize control connection reception buffer size to %zu bytes.", sizeof(struct lttcomm_relayd_hdr));
+ goto end;
+ }
+ break;
+ default:
+ goto end;
+ }
+ DBG("Reset communication state of relay connection (fd = %i)",
+ connection->sock->fd);
+end:
+ return ret;
+}
- assert(ht);
- assert(conn);
+struct relay_connection *connection_create(struct lttcomm_sock *sock,
+ enum connection_type type)
+{
+ struct relay_connection *conn;
- iter.iter.node = &conn->sock_n.node;
- ret = lttng_ht_del(ht, &iter);
- assert(!ret);
+ conn = zmalloc(sizeof(*conn));
+ if (!conn) {
+ PERROR("zmalloc relay connection");
+ goto end;
+ }
+ urcu_ref_init(&conn->ref);
+ conn->type = type;
+ conn->sock = sock;
+ lttng_ht_node_init_ulong(&conn->sock_n, (unsigned long) conn->sock->fd);
+ if (conn->type == RELAY_CONTROL) {
+ lttng_dynamic_buffer_init(&conn->protocol.ctrl.reception_buffer);
+ }
+ connection_reset_protocol_state(conn);
+end:
+ return conn;
}
-void connection_destroy(struct relay_connection *conn)
+static void rcu_free_connection(struct rcu_head *head)
{
- struct relay_stream *stream, *tmp_stream;
-
- assert(conn);
+ struct relay_connection *conn =
+ caa_container_of(head, struct relay_connection, rcu_node);
- /* Clean up recv list of this connection if any. */
- cds_list_for_each_entry_safe(stream, tmp_stream, &conn->recv_head,
- recv_list) {
- cds_list_del(&stream->recv_list);
+ lttcomm_destroy_sock(conn->sock);
+ if (conn->viewer_session) {
+ viewer_session_destroy(conn->viewer_session);
+ conn->viewer_session = NULL;
+ }
+ if (conn->type == RELAY_CONTROL) {
+ lttng_dynamic_buffer_reset(
+ &conn->protocol.ctrl.reception_buffer);
}
+ free(conn);
+}
+static void destroy_connection(struct relay_connection *conn)
+{
call_rcu(&conn->rcu_node, rcu_free_connection);
}
-struct relay_connection *connection_create(void)
+static void connection_release(struct urcu_ref *ref)
{
- struct relay_connection *conn;
+ struct relay_connection *conn =
+ caa_container_of(ref, struct relay_connection, ref);
- conn = zmalloc(sizeof(*conn));
- if (!conn) {
- PERROR("zmalloc relay connection");
- goto error;
+ if (conn->in_socket_ht) {
+ struct lttng_ht_iter iter;
+ int ret;
+
+ iter.iter.node = &conn->sock_n.node;
+ ret = lttng_ht_del(conn->socket_ht, &iter);
+ assert(!ret);
}
-error:
- return conn;
+ if (conn->session) {
+ if (session_close(conn->session)) {
+ ERR("session_close");
+ }
+ conn->session = NULL;
+ }
+ if (conn->viewer_session) {
+ viewer_session_close(conn->viewer_session);
+ }
+ destroy_connection(conn);
}
-void connection_init(struct relay_connection *conn)
+void connection_put(struct relay_connection *conn)
{
- assert(conn);
- assert(conn->sock);
+ rcu_read_lock();
+ urcu_ref_put(&conn->ref, connection_release);
+ rcu_read_unlock();
+}
- CDS_INIT_LIST_HEAD(&conn->recv_head);
- lttng_ht_node_init_ulong(&conn->sock_n, (unsigned long) conn->sock->fd);
+void connection_ht_add(struct lttng_ht *relay_connections_ht,
+ struct relay_connection *conn)
+{
+ assert(!conn->in_socket_ht);
+ lttng_ht_add_unique_ulong(relay_connections_ht, &conn->sock_n);
+ conn->in_socket_ht = 1;
+ conn->socket_ht = relay_connections_ht;
}
-void connection_free(struct relay_connection *conn)
+int connection_set_session(struct relay_connection *conn,
+ struct relay_session *session)
{
- assert(conn);
+ int ret = 0;
- free(conn);
+ assert(conn);
+ assert(session);
+ assert(!conn->session);
+
+ if (connection_get(conn)) {
+ if (session_get(session)) {
+ conn->session = session;
+ } else {
+ ERR("Failed to get session reference in connection_set_session()");
+ ret = -1;
+ }
+ connection_put(conn);
+ } else {
+ ERR("Failed to get connection reference in connection_set_session()");
+ ret = -1;
+ }
+ return ret;
}
projects / lttng-tools.git / blobdiff