+++ /dev/null
-/*
- * Copyright (C) 2013 - 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, 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.
- */
-
-#define _GNU_SOURCE
-#define _LGPL_SOURCE
-#include <common/common.h>
-#include <common/index/index.h>
-
-#include "lttng-relayd.h"
-#include "viewer-stream.h"
-
-static void viewer_stream_destroy(struct relay_viewer_stream *vstream)
-{
- free(vstream->path_name);
- free(vstream->channel_name);
- free(vstream);
-}
-
-static void viewer_stream_destroy_rcu(struct rcu_head *head)
-{
- struct relay_viewer_stream *vstream =
- caa_container_of(head, struct relay_viewer_stream, rcu_node);
-
- viewer_stream_destroy(vstream);
-}
-
-struct relay_viewer_stream *viewer_stream_create(struct relay_stream *stream,
- enum lttng_viewer_seek seek_t)
-{
- struct relay_viewer_stream *vstream;
-
- vstream = zmalloc(sizeof(*vstream));
- if (!vstream) {
- PERROR("relay viewer stream zmalloc");
- goto error;
- }
-
- vstream->path_name = strndup(stream->path_name, LTTNG_VIEWER_PATH_MAX);
- if (vstream->path_name == NULL) {
- PERROR("relay viewer path_name alloc");
- goto error;
- }
- vstream->channel_name = strndup(stream->channel_name,
- LTTNG_VIEWER_NAME_MAX);
- if (vstream->channel_name == NULL) {
- PERROR("relay viewer channel_name alloc");
- goto error;
- }
-
- switch (seek_t) {
- case LTTNG_VIEWER_SEEK_BEGINNING:
- vstream->current_tracefile_id = stream->oldest_tracefile_id;
- break;
- case LTTNG_VIEWER_SEEK_LAST:
- vstream->current_tracefile_id = stream->current_tracefile_id;
- break;
- default:
- goto error;
- }
- if (!stream_get(stream)) {
- ERR("Cannot get stream");
- goto error;
- }
- vstream->stream = stream;
-
- pthread_mutex_lock(&stream->lock);
- /*
- * If we never received an index for the current stream, delay the opening
- * of the index, otherwise open it right now.
- */
- if (vstream->current_tracefile_id == stream->current_tracefile_id
- && stream->total_index_received == 0) {
- vstream->index_fd = NULL;
- } else {
- int read_fd;
-
- read_fd = index_open(vstream->path_name, vstream->channel_name,
- stream->tracefile_count,
- vstream->current_tracefile_id);
- if (read_fd < 0) {
- goto error_unlock;
- }
- vstream->index_fd = stream_fd_create(read_fd);
- if (!vstream->index_fd) {
- if (close(read_fd)) {
- PERROR("close");
- }
- goto error_unlock;
- }
- }
-
- if (seek_t == LTTNG_VIEWER_SEEK_LAST && vstream->index_fd) {
- off_t lseek_ret;
-
- lseek_ret = lseek(vstream->index_fd->fd, 0, SEEK_END);
- if (lseek_ret < 0) {
- goto error_unlock;
- }
- vstream->last_sent_index = stream->total_index_received;
- }
- pthread_mutex_unlock(&stream->lock);
-
- if (stream->is_metadata) {
- rcu_assign_pointer(stream->trace->viewer_metadata_stream,
- vstream);
- }
-
- /* Globally visible after the add unique. */
- lttng_ht_node_init_u64(&vstream->stream_n, stream->stream_handle);
- lttng_ht_add_unique_u64(viewer_streams_ht, &vstream->stream_n);
-
- pthread_mutex_init(&vstream->reflock, NULL);
- urcu_ref_init(&vstream->ref);
-
- return vstream;
-
-error_unlock:
- pthread_mutex_unlock(&stream->lock);
-error:
- if (vstream) {
- viewer_stream_destroy(vstream);
- }
- return NULL;
-}
-
-static void viewer_stream_unpublish(struct relay_viewer_stream *vstream)
-{
- int ret;
- struct lttng_ht_iter iter;
-
- iter.iter.node = &vstream->stream_n.node;
- ret = lttng_ht_del(viewer_streams_ht, &iter);
- assert(!ret);
-}
-
-static void viewer_stream_release(struct urcu_ref *ref)
-{
- struct relay_viewer_stream *vstream = caa_container_of(ref,
- struct relay_viewer_stream, ref);
-
- if (vstream->stream->is_metadata) {
- rcu_assign_pointer(vstream->stream->trace->viewer_metadata_stream, NULL);
- }
-
- viewer_stream_unpublish(vstream);
-
- if (vstream->stream_fd) {
- stream_fd_put(vstream->stream_fd);
- vstream->stream_fd = NULL;
- }
- if (vstream->index_fd) {
- stream_fd_put(vstream->index_fd);
- vstream->index_fd = NULL;
- }
- if (vstream->stream) {
- stream_put(vstream->stream);
- vstream->stream = NULL;
- }
- call_rcu(&vstream->rcu_node, viewer_stream_destroy_rcu);
-}
-
-/* Must be called with RCU read-side lock held. */
-bool viewer_stream_get(struct relay_viewer_stream *vstream)
-{
- bool has_ref = false;
-
- pthread_mutex_lock(&vstream->reflock);
- if (vstream->ref.refcount != 0) {
- has_ref = true;
- urcu_ref_get(&vstream->ref);
- }
- pthread_mutex_unlock(&vstream->reflock);
-
- return has_ref;
-}
-
-/*
- * Get viewer stream by id.
- *
- * Return viewer stream if found else NULL.
- */
-struct relay_viewer_stream *viewer_stream_get_by_id(uint64_t id)
-{
- struct lttng_ht_node_u64 *node;
- struct lttng_ht_iter iter;
- struct relay_viewer_stream *vstream = NULL;
-
- rcu_read_lock();
- lttng_ht_lookup(viewer_streams_ht, &id, &iter);
- node = lttng_ht_iter_get_node_u64(&iter);
- if (!node) {
- DBG("Relay viewer stream %" PRIu64 " not found", id);
- goto end;
- }
- vstream = caa_container_of(node, struct relay_viewer_stream, stream_n);
- if (!viewer_stream_get(vstream)) {
- vstream = NULL;
- }
-end:
- rcu_read_unlock();
- return vstream;
-}
-
-void viewer_stream_put(struct relay_viewer_stream *vstream)
-{
- rcu_read_lock();
- pthread_mutex_lock(&vstream->reflock);
- urcu_ref_put(&vstream->ref, viewer_stream_release);
- pthread_mutex_unlock(&vstream->reflock);
- rcu_read_unlock();
-}
-
-/*
- * Returns whether the current tracefile is readable. If not, it has
- * been overwritten.
- * Must be called with rstream lock held.
- */
-bool viewer_stream_is_tracefile_seq_readable(struct relay_viewer_stream *vstream,
- uint64_t seq)
-{
- struct relay_stream *stream = vstream->stream;
-
- if (seq >= stream->oldest_tracefile_seq
- && seq <= stream->current_tracefile_seq) {
- /* seq is a readable file. */
- return true;
- } else {
- /* seq is not readable. */
- return false;
- }
-}
-
-/*
- * Rotate a stream to the next tracefile.
- *
- * Must be called with the rstream lock held.
- * Returns 0 on success, 1 on EOF, a negative value on error.
- */
-int viewer_stream_rotate(struct relay_viewer_stream *vstream)
-{
- int ret;
- struct relay_stream *stream = vstream->stream;
-
- /* Detect the last tracefile to open. */
- if (stream->total_index_received == vstream->last_sent_index
- && stream->trace->session->connection_closed) {
- ret = 1;
- goto end;
- }
-
- if (stream->tracefile_count == 0) {
- /* Ignore rotation, there is none to do. */
- ret = 0;
- goto end;
- }
-
- if (!viewer_stream_is_tracefile_seq_readable(vstream,
- vstream->current_tracefile_seq + 1)) {
- vstream->current_tracefile_id =
- stream->oldest_tracefile_id;
- vstream->current_tracefile_seq =
- stream->oldest_tracefile_seq;
- } else {
- vstream->current_tracefile_id =
- (vstream->current_tracefile_id + 1)
- % stream->tracefile_count;
- vstream->current_tracefile_seq++;
- }
-
- if (vstream->index_fd) {
- stream_fd_put(vstream->index_fd);
- vstream->index_fd = NULL;
- }
- if (vstream->stream_fd) {
- stream_fd_put(vstream->stream_fd);
- vstream->stream_fd = NULL;
- }
-
- ret = index_open(vstream->path_name, vstream->channel_name,
- stream->tracefile_count,
- vstream->current_tracefile_id);
- if (ret < 0) {
- goto end;
- }
- vstream->index_fd = stream_fd_create(ret);
- if (vstream->index_fd) {
- ret = 0;
- } else {
- if (close(ret)) {
- PERROR("close");
- }
- ret = -1;
- }
-end:
- return ret;
-}
-
-void print_viewer_streams(void)
-{
- struct lttng_ht_iter iter;
- struct relay_viewer_stream *vstream;
-
- rcu_read_lock();
- cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream,
- stream_n.node) {
- if (!viewer_stream_get(vstream)) {
- continue;
- }
- DBG("vstream %p refcount %ld stream %" PRIu64 " trace %" PRIu64
- " session %" PRIu64,
- vstream,
- vstream->ref.refcount,
- vstream->stream->stream_handle,
- vstream->stream->trace->id,
- vstream->stream->trace->session->id);
- viewer_stream_put(vstream);
- }
- rcu_read_unlock();
-}
projects / lttng-tools.git / blobdiff