Rename C++ header files to .hpp

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

diff --git a/src/bin/lttng-relayd/connection.hpp b/src/bin/lttng-relayd/connection.hpp
new file mode 100644 (file)
index 0000000..de25255
--- /dev/null
+++ b/src/bin/lttng-relayd/connection.hpp
@@ -0,0 +1,144 @@
+#ifndef _CONNECTION_H
+#define _CONNECTION_H
+
+/*
+ * 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
+ *
+ */
+
+#include <limits.h>
+#include <inttypes.h>
+#include <pthread.h>
+#include <urcu.h>
+#include <urcu/wfcqueue.h>
+#include <urcu/list.h>
+
+#include <common/hashtable/hashtable.hpp>
+#include <common/sessiond-comm/sessiond-comm.hpp>
+#include <common/sessiond-comm/relayd.hpp>
+#include <common/dynamic-buffer.hpp>
+
+#include "session.hpp"
+
+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;
+
+       /*
+        * Protocol version to use for this connection. Only valid for
+        * RELAY_CONTROL connection type.
+        */
+       uint32_t major;
+       uint32_t minor;
+
+       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_create(struct lttcomm_sock *sock,
+               enum connection_type type);
+struct relay_connection *connection_get_by_sock(struct lttng_ht *relay_connections_ht,
+               int sock);
+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 */