bin: compile lttng-relayd as a C++

[lttng-tools.git] / src / bin / lttng-relayd / connection.cpp

diff --git a/src/bin/lttng-relayd/connection.cpp b/src/bin/lttng-relayd/connection.cpp
new file mode 100644 (file)
index 0000000..98ffad2
--- /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;
+}