+#ifndef _CONNECTION_H
+#define _CONNECTION_H
+
/*
- * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
- * David Goulet <dgoulet@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.
+ * 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 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.
+ * SPDX-License-Identifier: GPL-2.0-only
*
- * 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.
*/
-#ifndef _CONNECTION_H
-#define _CONNECTION_H
-
#include <limits.h>
#include <inttypes.h>
#include <pthread.h>
#include <urcu.h>
+#include <urcu/wfcqueue.h>
#include <urcu/list.h>
#include <common/hashtable/hashtable.h>
#include <common/sessiond-comm/sessiond-comm.h>
+#include <common/sessiond-comm/relayd.h>
+#include <common/dynamic-buffer.h>
#include "session.h"
enum connection_type {
+ RELAY_CONNECTION_UNKNOWN = 0,
RELAY_DATA = 1,
RELAY_CONTROL = 2,
RELAY_VIEWER_COMMAND = 3,
RELAY_VIEWER_NOTIFICATION = 4,
};
+enum data_connection_state {
+ DATA_CONNECTION_STATE_RECEIVE_HEADER = 0,
+ DATA_CONNECTION_STATE_RECEIVE_PAYLOAD = 1,
+};
+
+enum ctrl_connection_state {
+ CTRL_CONNECTION_STATE_RECEIVE_HEADER = 0,
+ CTRL_CONNECTION_STATE_RECEIVE_PAYLOAD = 1,
+};
+
+struct data_connection_state_receive_header {
+ uint64_t received, left_to_receive;
+ char header_reception_buffer[sizeof(struct lttcomm_relayd_data_hdr)];
+};
+
+struct data_connection_state_receive_payload {
+ uint64_t received, left_to_receive;
+ struct lttcomm_relayd_data_hdr header;
+ bool rotate_index;
+};
+
+struct ctrl_connection_state_receive_header {
+ uint64_t received, left_to_receive;
+};
+
+struct ctrl_connection_state_receive_payload {
+ uint64_t received, left_to_receive;
+ struct lttcomm_relayd_hdr header;
+};
+
/*
* Internal structure to map a socket with the corresponding session.
* A hashtable indexed on the socket FD is used for the lookups.
+ *
+ * Connections are assumed to be accessed from a single thread. Live
+ * connections between the relay and a live client are only accessed
+ * from the live worker thread.
+ *
+ * The connections between the consumerd/sessiond and the relayd are only
+ * handled by the "main" worker thread (as in, the worker thread in main.c).
+ *
+ * This is why there are no back references to connections from the
+ * sessions and session list.
*/
struct relay_connection {
struct lttcomm_sock *sock;
+ struct cds_wfcq_node qnode;
+
+ enum connection_type type;
+ /*
+ * session is only ever set for RELAY_CONTROL connection type.
+ */
struct relay_session *session;
+ /*
+ * viewer_session is only ever set for RELAY_VIEWER_COMMAND
+ * connection type.
+ */
struct relay_viewer_session *viewer_session;
- struct cds_wfq_node qnode;
- struct lttng_ht_node_ulong sock_n;
- struct rcu_head rcu_node;
- enum connection_type type;
- /* Protocol version to use for this connection. */
+
+ /*
+ * Protocol version to use for this connection. Only valid for
+ * RELAY_CONTROL connection type.
+ */
uint32_t major;
uint32_t minor;
- uint64_t session_id;
- struct cds_list_head recv_head;
- unsigned int version_check_done:1;
- /* Pointer to the sessions HT that this connection can use. */
- struct lttng_ht *sessions_ht;
+ struct urcu_ref ref;
+
+ bool version_check_done;
+
+ /*
+ * Node member of connection within global socket hash table.
+ */
+ struct lttng_ht_node_ulong sock_n;
+ bool in_socket_ht;
+ struct lttng_ht *socket_ht; /* HACK: Contained within this hash table. */
+ struct rcu_head rcu_node; /* For call_rcu teardown. */
+
+ union {
+ struct {
+ enum data_connection_state state_id;
+ union {
+ struct data_connection_state_receive_header receive_header;
+ struct data_connection_state_receive_payload receive_payload;
+ } state;
+ } data;
+ struct {
+ enum ctrl_connection_state state_id;
+ union {
+ struct ctrl_connection_state_receive_header receive_header;
+ struct ctrl_connection_state_receive_payload receive_payload;
+ } state;
+ struct lttng_dynamic_buffer reception_buffer;
+ } ctrl;
+ } protocol;
};
-struct relay_connection *connection_find_by_sock(struct lttng_ht *ht,
+struct relay_connection *connection_create(struct lttcomm_sock *sock,
+ enum connection_type type);
+struct relay_connection *connection_get_by_sock(struct lttng_ht *relay_connections_ht,
int sock);
-struct relay_connection *connection_create(void);
-void connection_init(struct relay_connection *conn);
-void connection_delete(struct lttng_ht *ht, struct relay_connection *conn);
-void connection_destroy(struct relay_connection *conn);
-void connection_free(struct relay_connection *conn);
+int connection_reset_protocol_state(struct relay_connection *connection);
+bool connection_get(struct relay_connection *connection);
+void connection_put(struct relay_connection *connection);
+void connection_ht_add(struct lttng_ht *relay_connections_ht,
+ struct relay_connection *conn);
+int connection_set_session(struct relay_connection *conn,
+ struct relay_session *session);
#endif /* _CONNECTION_H */
projects / lttng-tools.git / blobdiff