+#ifndef LTTNG_RELAYD_H
+#define LTTNG_RELAYD_H
+
/*
* Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com>
* David Goulet <dgoulet@efficios.com>
+ * 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,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#ifndef LTTNG_RELAYD_H
-#define LTTNG_RELAYD_H
-
-#define _LGPL_SOURCE
#include <limits.h>
#include <urcu.h>
-#include <urcu/wfqueue.h>
+#include <urcu/wfcqueue.h>
#include <common/hashtable/hashtable.h>
-#include <common/index/lttng-index.h>
-#include "ctf-trace.h"
+struct sessiond_trace_chunk_registry;
/*
* Queue used to enqueue relay requests
*/
-struct relay_cmd_queue {
- struct cds_wfq_queue queue;
+struct relay_conn_queue {
+ struct cds_wfcq_head head;
+ struct cds_wfcq_tail tail;
int32_t futex;
};
-enum connection_type {
- RELAY_DATA = 1,
- RELAY_CONTROL = 2,
- RELAY_VIEWER_COMMAND = 3,
- RELAY_VIEWER_NOTIFICATION = 4,
-};
-
/*
- * Represents a session for the relay point of view
+ * Contains stream indexed by ID. This is important since many commands lookup
+ * streams only by ID thus also keeping them in this hash table makes the
+ * search O(1).
*/
-struct relay_session {
- /*
- * This session id is used to identify a set of stream to a tracing session
- * but also make sure we have a unique session id associated with a session
- * daemon which can provide multiple data source.
- */
- uint64_t id;
- struct lttcomm_sock *sock;
- char session_name[NAME_MAX];
- char hostname[HOST_NAME_MAX];
- uint32_t live_timer;
- struct lttng_ht_node_ulong session_n;
- struct rcu_head rcu_node;
- uint32_t viewer_attached;
- uint32_t stream_count;
- /* Tell if this session is for a snapshot or not. */
- unsigned int snapshot:1;
-
- /*
- * Indicate version protocol for this session. This is especially useful
- * for the data thread that has no idea which version it operates on since
- * linking control/data sockets is non trivial.
- */
- uint64_t minor;
- uint64_t major;
-};
-
-/*
- * Represents a stream in the relay
- */
-struct relay_stream {
- uint64_t stream_handle;
- uint64_t prev_seq; /* previous data sequence number encountered */
- struct lttng_ht_node_ulong stream_n;
- struct relay_session *session;
- struct rcu_head rcu_node;
- int fd;
- /* FD on which to write the index data. */
- int index_fd;
- /* FD on which to read the index data for the viewer. */
- int read_index_fd;
-
- char *path_name;
- char *channel_name;
- /* on-disk circular buffer of tracefiles */
- uint64_t tracefile_size;
- uint64_t tracefile_size_current;
- uint64_t tracefile_count;
- uint64_t tracefile_count_current;
-
- uint64_t total_index_received;
- struct relay_viewer_stream *viewer_stream;
- uint64_t last_net_seq_num;
- struct lttng_ht_node_str ctf_trace_node;
-
- /*
- * To protect from concurrent read/update between the
- * streaming-side and the viewer-side.
- * This lock must be held, we reading/updating the
- * ctf_trace pointer.
- */
- pthread_mutex_t lock;
-
- struct ctf_trace *ctf_trace;
- /*
- * If the stream is inactive, this field is updated with the live beacon
- * timestamp end, when it is active, this field == -1ULL.
- */
- uint64_t beacon_ts_end;
-
- /* Information telling us when to close the stream */
- unsigned int close_flag:1;
- /* Indicate if the stream was initialized for a data pending command. */
- unsigned int data_pending_check_done:1;
- unsigned int metadata_flag:1;
-};
-
-/*
- * Shadow copy of the relay_stream structure for the viewer side. The only
- * fields updated by the writer (streaming side) after allocation are :
- * total_index_received and close_flag. Everything else is updated by the
- * reader (viewer side).
- */
-struct relay_viewer_stream {
- uint64_t stream_handle;
- uint64_t session_id;
- int read_fd;
- int index_read_fd;
- char *path_name;
- char *channel_name;
- uint64_t last_sent_index;
- uint64_t total_index_received;
- uint64_t tracefile_size;
- uint64_t tracefile_size_current;
- uint64_t tracefile_count;
- uint64_t tracefile_count_current;
- struct lttng_ht_node_u64 stream_n;
- struct rcu_head rcu_node;
- struct ctf_trace *ctf_trace;
- /* Information telling us if the stream is a metadata stream. */
- unsigned int metadata_flag:1;
-};
-
-/*
- * Internal structure to map a socket with the corresponding session.
- * A hashtable indexed on the socket FD is used for the lookups.
- */
-struct relay_command {
- struct lttcomm_sock *sock;
- struct relay_session *session;
- struct cds_wfq_node node;
- struct lttng_ht_node_ulong sock_n;
- struct rcu_head rcu_node;
- enum connection_type type;
- unsigned int version_check_done:1;
- /* protocol version to use for this session */
- uint32_t major;
- uint32_t minor;
- struct lttng_ht *ctf_traces_ht; /* indexed by path name */
- uint64_t session_id;
-};
-
-struct relay_local_data {
- struct lttng_ht *sessions_ht;
-};
+extern struct lttng_ht *sessions_ht;
+extern struct lttng_ht *relay_streams_ht;
+extern struct lttng_ht *viewer_streams_ht;
+extern struct sessiond_trace_chunk_registry *sessiond_trace_chunk_registry;
extern char *opt_output_path;
+extern const char *tracing_group_name;
+extern const char * const config_section_name;
-extern struct lttng_ht *relay_streams_ht;
-extern struct lttng_ht *viewer_streams_ht;
-extern struct lttng_ht *indexes_ht;
+extern int thread_quit_pipe[2];
-struct relay_stream *relay_stream_find_by_id(uint64_t stream_id);
+void lttng_relay_notify_ready(void);
+int lttng_relay_stop_threads(void);
#endif /* LTTNG_RELAYD_H */