X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fbin%2Flttng-relayd%2Fconnection.cpp;fp=src%2Fbin%2Flttng-relayd%2Fconnection.cpp;h=98ffad29f986de121db5b607c9a9cfd7b0918abb;hb=ac497a37018f3c253d2e50397294f58d33f7f24f;hp=0000000000000000000000000000000000000000;hpb=7966af5763c4aaca39df9bbfa9277ff15715c720;p=lttng-tools.git

diff --git a/src/bin/lttng-relayd/connection.cpp b/src/bin/lttng-relayd/connection.cpp
new file mode 100644
index 000000000..98ffad29f
--- /dev/null
+++ b/src/bin/lttng-relayd/connection.cpp
@@ -0,0 +1,196 @@
+/*
+ * 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>
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ */
+
+#define _LGPL_SOURCE
+#include <common/common.h>
+#include <urcu/rculist.h>
+
+#include "connection.h"
+#include "stream.h"
+#include "viewer-session.h"
+
+bool connection_get(struct relay_connection *conn)
+{
+	return urcu_ref_get_unless_zero(&conn->ref);
+}
+
+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;
+
+	LTTNG_ASSERT(sock >= 0);
+
+	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;
+}
+
+int connection_reset_protocol_state(struct relay_connection *connection)
+{
+	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;
+}
+
+struct relay_connection *connection_create(struct lttcomm_sock *sock,
+		enum connection_type type)
+{
+	struct relay_connection *conn;
+
+	conn = (relay_connection *) 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;
+}
+
+static void rcu_free_connection(struct rcu_head *head)
+{
+	struct relay_connection *conn =
+		caa_container_of(head, struct relay_connection, rcu_node);
+
+	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);
+}
+
+static void connection_release(struct urcu_ref *ref)
+{
+	struct relay_connection *conn =
+		caa_container_of(ref, struct relay_connection, ref);
+
+	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);
+		LTTNG_ASSERT(!ret);
+	}
+
+	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_put(struct relay_connection *conn)
+{
+	rcu_read_lock();
+	urcu_ref_put(&conn->ref, connection_release);
+	rcu_read_unlock();
+}
+
+void connection_ht_add(struct lttng_ht *relay_connections_ht,
+		struct relay_connection *conn)
+{
+	LTTNG_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;
+}
+
+int connection_set_session(struct relay_connection *conn,
+		struct relay_session *session)
+{
+	int ret = 0;
+
+	LTTNG_ASSERT(conn);
+	LTTNG_ASSERT(session);
+	LTTNG_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;
+}