+++ /dev/null
-/*
- * Copyright (C) 2012 - 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.
- *
- * 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.
- *
- * 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 LTTNG_RELAYD_H
-#define LTTNG_RELAYD_H
-
-#define _LGPL_SOURCE
-#include <limits.h>
-#include <urcu.h>
-#include <urcu/wfqueue.h>
-
-#include <common/hashtable/hashtable.h>
-#include <common/index/lttng-index.h>
-
-#include "ctf-trace.h"
-
-/*
- * Queue used to enqueue relay requests
- */
-struct relay_cmd_queue {
- struct cds_wfq_queue queue;
- 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
- */
-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;
- /* To inform the viewer up to where it can go back in time. */
- uint64_t oldest_tracefile_id;
-
- uint64_t total_index_received;
- struct relay_viewer_stream *viewer_stream;
- uint64_t last_net_seq_num;
-
- /*
- * This node is added to the *control* connection hash table and the
- * pointer is copied in here so we can access it when deleting this object.
- * When deleting this, the ctf trace ht MUST NOT be destroyed. This happens
- * at connection deletion.
- */
- struct lttng_ht_node_str ctf_trace_node;
- struct lttng_ht *ctf_traces_ht;
-
- /*
- * 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;
- /*
- * To protect the update of the close_write_flag and the checks of
- * the tracefile_count_current.
- * It is taken before checking whenever we need to know if the
- * writer and reader are working in the same tracefile.
- */
- pthread_mutex_t viewer_stream_rotation_lock;
-
- /* 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;
- /*
- * To detect when we start overwriting old data, it is used to
- * update the oldest_tracefile_id.
- */
- unsigned int tracefile_overwrite: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_count;
- uint64_t tracefile_count_current;
- struct lttng_ht_node_u64 stream_n;
- struct rcu_head rcu_node;
- struct ctf_trace *ctf_trace;
- /*
- * This lock blocks only when the writer is about to start overwriting
- * a file currently read by the reader.
- */
- pthread_mutex_t overwrite_lock;
- /* Information telling us if the stream is a metadata stream. */
- unsigned int metadata_flag:1;
- /*
- * Information telling us that the stream is closed in write, so
- * we don't expect new indexes and we can read up to EOF.
- */
- unsigned int close_write_flag:1;
- /*
- * If the streaming side closes a FD in use in the viewer side,
- * it sets this flag to inform that it is a normal error.
- */
- unsigned int abort_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 char *opt_output_path;
-
-extern struct lttng_ht *relay_streams_ht;
-extern struct lttng_ht *viewer_streams_ht;
-extern struct lttng_ht *indexes_ht;
-
-extern const char *tracing_group_name;
-
-struct relay_stream *relay_stream_find_by_id(uint64_t stream_id);
-
-#endif /* LTTNG_RELAYD_H */
projects / lttng-tools.git / blobdiff