X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-relayd%2Fstream.c;h=1eaca14ec934e27c6a36f3c986bce70d09340a85;hp=6650700838fc27596e8c8f086cc7815c8a14a098;hb=HEAD;hpb=348a81dcf7b6944b10a813d93dcaf86fdb5194f6 diff --git a/src/bin/lttng-relayd/stream.c b/src/bin/lttng-relayd/stream.c deleted file mode 100644 index 665070083..000000000 --- a/src/bin/lttng-relayd/stream.c +++ /dev/null @@ -1,528 +0,0 @@ -/* - * Copyright (C) 2013 - Julien Desfossez - * David Goulet - * 2015 - Mathieu Desnoyers - * - * 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 _LGPL_SOURCE -#include -#include -#include -#include -#include - -#include "lttng-relayd.h" -#include "index.h" -#include "stream.h" -#include "viewer-stream.h" - -#include -#include - -/* Should be called with RCU read-side lock held. */ -bool stream_get(struct relay_stream *stream) -{ - return urcu_ref_get_unless_zero(&stream->ref); -} - -/* - * Get stream from stream id from the streams hash table. Return stream - * if found else NULL. A stream reference is taken when a stream is - * returned. stream_put() must be called on that stream. - */ -struct relay_stream *stream_get_by_id(uint64_t stream_id) -{ - struct lttng_ht_node_u64 *node; - struct lttng_ht_iter iter; - struct relay_stream *stream = NULL; - - rcu_read_lock(); - lttng_ht_lookup(relay_streams_ht, &stream_id, &iter); - node = lttng_ht_iter_get_node_u64(&iter); - if (!node) { - DBG("Relay stream %" PRIu64 " not found", stream_id); - goto end; - } - stream = caa_container_of(node, struct relay_stream, node); - if (!stream_get(stream)) { - stream = NULL; - } -end: - rcu_read_unlock(); - return stream; -} - -static int stream_create_data_output_file(struct relay_stream *stream) -{ - int ret, fd; - enum lttng_trace_chunk_status status; - const int flags = O_RDWR | O_CREAT | O_TRUNC; - const mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP; - char stream_path[LTTNG_PATH_MAX]; - - ASSERT_LOCKED(stream->lock); - assert(stream->trace_chunk); - - if (stream->stream_fd) { - stream_fd_put(stream->stream_fd); - stream->stream_fd = NULL; - } - - ret = utils_stream_file_path(stream->path_name, stream->channel_name, - stream->tracefile_size, stream->tracefile_count, NULL, - stream_path, sizeof(stream_path)); - if (ret < 0) { - goto end; - } - - DBG("Opening stream output file \"%s\"", stream_path); - status = lttng_trace_chunk_open_file( - stream->trace_chunk, stream_path, flags, mode, &fd); - if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { - ERR("Failed to open stream file \"%s\"", stream->channel_name); - ret = -1; - goto end; - } - - stream->stream_fd = stream_fd_create(fd); - if (!stream->stream_fd) { - if (close(ret)) { - PERROR("Error closing stream file descriptor %d", ret); - } - ret = -1; - goto end; - } -end: - return ret; -} - -static int stream_set_trace_chunk(struct relay_stream *stream, - struct lttng_trace_chunk *chunk) -{ - int ret = 0; - enum lttng_trace_chunk_status status; - bool acquired_reference; - - pthread_mutex_lock(&stream->lock); - status = lttng_trace_chunk_create_subdirectory(chunk, - stream->path_name); - if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { - ret = -1; - goto end; - } - - lttng_trace_chunk_put(stream->trace_chunk); - acquired_reference = lttng_trace_chunk_get(chunk); - assert(acquired_reference); - stream->trace_chunk = chunk; - ret = stream_create_data_output_file(stream); -end: - pthread_mutex_unlock(&stream->lock); - return ret; -} - -/* - * We keep ownership of path_name and channel_name. - */ -struct relay_stream *stream_create(struct ctf_trace *trace, - uint64_t stream_handle, char *path_name, - char *channel_name, uint64_t tracefile_size, - uint64_t tracefile_count) -{ - int ret; - struct relay_stream *stream = NULL; - struct relay_session *session = trace->session; - bool acquired_reference = false; - struct lttng_trace_chunk *current_trace_chunk; - - stream = zmalloc(sizeof(struct relay_stream)); - if (stream == NULL) { - PERROR("relay stream zmalloc"); - goto error_no_alloc; - } - - stream->stream_handle = stream_handle; - stream->prev_data_seq = -1ULL; - stream->prev_index_seq = -1ULL; - stream->last_net_seq_num = -1ULL; - stream->ctf_stream_id = -1ULL; - stream->tracefile_size = tracefile_size; - stream->tracefile_count = tracefile_count; - stream->path_name = path_name; - stream->prev_path_name = NULL; - stream->channel_name = channel_name; - stream->rotate_at_seq_num = -1ULL; - stream->beacon_ts_end = -1ULL; - lttng_ht_node_init_u64(&stream->node, stream->stream_handle); - pthread_mutex_init(&stream->lock, NULL); - urcu_ref_init(&stream->ref); - ctf_trace_get(trace); - stream->trace = trace; - - pthread_mutex_lock(&trace->session->lock); - current_trace_chunk = trace->session->current_trace_chunk; - if (current_trace_chunk) { - acquired_reference = lttng_trace_chunk_get(current_trace_chunk); - } - pthread_mutex_unlock(&trace->session->lock); - if (!acquired_reference) { - ERR("Cannot create stream for channel \"%s\" as a reference to the session's current trace chunk could not be acquired", - channel_name); - ret = -1; - goto end; - } - - stream->indexes_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); - if (!stream->indexes_ht) { - ERR("Cannot created indexes_ht"); - ret = -1; - goto end; - } - - ret = stream_set_trace_chunk(stream, current_trace_chunk); - if (ret) { - ERR("Failed to set the current trace chunk of session \"%s\" on newly created stream of channel \"%s\"", - trace->session->session_name, - stream->channel_name); - ret = -1; - goto end; - } - stream->tfa = tracefile_array_create(stream->tracefile_count); - if (!stream->tfa) { - ret = -1; - goto end; - } - - stream->is_metadata = !strcmp(stream->channel_name, - DEFAULT_METADATA_NAME); - stream->in_recv_list = true; - - /* - * Add the stream in the recv list of the session. Once the end stream - * message is received, all session streams are published. - */ - pthread_mutex_lock(&session->recv_list_lock); - cds_list_add_rcu(&stream->recv_node, &session->recv_list); - session->stream_count++; - pthread_mutex_unlock(&session->recv_list_lock); - - /* - * Both in the ctf_trace object and the global stream ht since the data - * side of the relayd does not have the concept of session. - */ - lttng_ht_add_unique_u64(relay_streams_ht, &stream->node); - stream->in_stream_ht = true; - - DBG("Relay new stream added %s with ID %" PRIu64, stream->channel_name, - stream->stream_handle); - ret = 0; - -end: - if (ret) { - if (stream->stream_fd) { - stream_fd_put(stream->stream_fd); - stream->stream_fd = NULL; - } - stream_put(stream); - stream = NULL; - } - lttng_trace_chunk_put(current_trace_chunk); - return stream; - -error_no_alloc: - /* - * path_name and channel_name need to be freed explicitly here - * because we cannot rely on stream_put(). - */ - free(path_name); - free(channel_name); - return NULL; -} - -/* - * Called with the session lock held. - */ -void stream_publish(struct relay_stream *stream) -{ - struct relay_session *session; - - pthread_mutex_lock(&stream->lock); - if (stream->published) { - goto unlock; - } - - session = stream->trace->session; - - pthread_mutex_lock(&session->recv_list_lock); - if (stream->in_recv_list) { - cds_list_del_rcu(&stream->recv_node); - stream->in_recv_list = false; - } - pthread_mutex_unlock(&session->recv_list_lock); - - pthread_mutex_lock(&stream->trace->stream_list_lock); - cds_list_add_rcu(&stream->stream_node, &stream->trace->stream_list); - pthread_mutex_unlock(&stream->trace->stream_list_lock); - - stream->published = true; -unlock: - pthread_mutex_unlock(&stream->lock); -} - -/* - * Stream must be protected by holding the stream lock or by virtue of being - * called from stream_destroy. - */ -static void stream_unpublish(struct relay_stream *stream) -{ - if (stream->in_stream_ht) { - struct lttng_ht_iter iter; - int ret; - - iter.iter.node = &stream->node.node; - ret = lttng_ht_del(relay_streams_ht, &iter); - assert(!ret); - stream->in_stream_ht = false; - } - if (stream->published) { - pthread_mutex_lock(&stream->trace->stream_list_lock); - cds_list_del_rcu(&stream->stream_node); - pthread_mutex_unlock(&stream->trace->stream_list_lock); - stream->published = false; - } -} - -static void stream_destroy(struct relay_stream *stream) -{ - if (stream->indexes_ht) { - /* - * Calling lttng_ht_destroy in call_rcu worker thread so - * we don't hold the RCU read-side lock while calling - * it. - */ - lttng_ht_destroy(stream->indexes_ht); - } - if (stream->tfa) { - tracefile_array_destroy(stream->tfa); - } - free(stream->path_name); - free(stream->prev_path_name); - free(stream->channel_name); - free(stream); -} - -static void stream_destroy_rcu(struct rcu_head *rcu_head) -{ - struct relay_stream *stream = - caa_container_of(rcu_head, struct relay_stream, rcu_node); - - stream_destroy(stream); -} - -/* - * No need to take stream->lock since this is only called on the final - * stream_put which ensures that a single thread may act on the stream. - */ -static void stream_release(struct urcu_ref *ref) -{ - struct relay_stream *stream = - caa_container_of(ref, struct relay_stream, ref); - struct relay_session *session; - - session = stream->trace->session; - - DBG("Releasing stream id %" PRIu64, stream->stream_handle); - - pthread_mutex_lock(&session->recv_list_lock); - session->stream_count--; - if (stream->in_recv_list) { - cds_list_del_rcu(&stream->recv_node); - stream->in_recv_list = false; - } - pthread_mutex_unlock(&session->recv_list_lock); - - stream_unpublish(stream); - - if (stream->stream_fd) { - stream_fd_put(stream->stream_fd); - stream->stream_fd = NULL; - } - if (stream->index_file) { - lttng_index_file_put(stream->index_file); - stream->index_file = NULL; - } - if (stream->trace) { - ctf_trace_put(stream->trace); - stream->trace = NULL; - } - lttng_trace_chunk_put(stream->trace_chunk); - stream->trace_chunk = NULL; - - call_rcu(&stream->rcu_node, stream_destroy_rcu); -} - -void stream_put(struct relay_stream *stream) -{ - DBG("stream put for stream id %" PRIu64, stream->stream_handle); - rcu_read_lock(); - assert(stream->ref.refcount != 0); - /* - * Wait until we have processed all the stream packets before - * actually putting our last stream reference. - */ - DBG("stream put stream id %" PRIu64 " refcount %d", - stream->stream_handle, - (int) stream->ref.refcount); - urcu_ref_put(&stream->ref, stream_release); - rcu_read_unlock(); -} - -void try_stream_close(struct relay_stream *stream) -{ - bool session_aborted; - struct relay_session *session = stream->trace->session; - - DBG("Trying to close stream %" PRIu64, stream->stream_handle); - - pthread_mutex_lock(&session->lock); - session_aborted = session->aborted; - pthread_mutex_unlock(&session->lock); - - pthread_mutex_lock(&stream->lock); - /* - * Can be called concurently by connection close and reception of last - * pending data. - */ - if (stream->closed) { - pthread_mutex_unlock(&stream->lock); - DBG("closing stream %" PRIu64 " aborted since it is already marked as closed", stream->stream_handle); - return; - } - - stream->close_requested = true; - - if (stream->last_net_seq_num == -1ULL) { - /* - * Handle connection close without explicit stream close - * command. - * - * We can be clever about indexes partially received in - * cases where we received the data socket part, but not - * the control socket part: since we're currently closing - * the stream on behalf of the control socket, we *know* - * there won't be any more control information for this - * socket. Therefore, we can destroy all indexes for - * which we have received only the file descriptor (from - * data socket). This takes care of consumerd crashes - * between sending the data and control information for - * a packet. Since those are sent in that order, we take - * care of consumerd crashes. - */ - DBG("relay_index_close_partial_fd"); - relay_index_close_partial_fd(stream); - /* - * Use the highest net_seq_num we currently have pending - * As end of stream indicator. Leave last_net_seq_num - * at -1ULL if we cannot find any index. - */ - stream->last_net_seq_num = relay_index_find_last(stream); - DBG("Updating stream->last_net_seq_num to %" PRIu64, stream->last_net_seq_num); - /* Fall-through into the next check. */ - } - - if (stream->last_net_seq_num != -1ULL && - ((int64_t) (stream->prev_data_seq - stream->last_net_seq_num)) < 0 - && !session_aborted) { - /* - * Don't close since we still have data pending. This - * handles cases where an explicit close command has - * been received for this stream, and cases where the - * connection has been closed, and we are awaiting for - * index information from the data socket. It is - * therefore expected that all the index fd information - * we need has already been received on the control - * socket. Matching index information from data socket - * should be Expected Soon(TM). - * - * TODO: We should implement a timer to garbage collect - * streams after a timeout to be resilient against a - * consumerd implementation that would not match this - * expected behavior. - */ - pthread_mutex_unlock(&stream->lock); - DBG("closing stream %" PRIu64 " aborted since it still has data pending", stream->stream_handle); - return; - } - /* - * We received all the indexes we can expect. - */ - stream_unpublish(stream); - stream->closed = true; - /* Relay indexes are only used by the "consumer/sessiond" end. */ - relay_index_close_all(stream); - pthread_mutex_unlock(&stream->lock); - DBG("Succeeded in closing stream %" PRIu64, stream->stream_handle); - stream_put(stream); -} - -static void print_stream_indexes(struct relay_stream *stream) -{ - struct lttng_ht_iter iter; - struct relay_index *index; - - rcu_read_lock(); - cds_lfht_for_each_entry(stream->indexes_ht->ht, &iter.iter, index, - index_n.node) { - DBG("index %p net_seq_num %" PRIu64 " refcount %ld" - " stream %" PRIu64 " trace %" PRIu64 - " session %" PRIu64, - index, - index->index_n.key, - stream->ref.refcount, - index->stream->stream_handle, - index->stream->trace->id, - index->stream->trace->session->id); - } - rcu_read_unlock(); -} - -void print_relay_streams(void) -{ - struct lttng_ht_iter iter; - struct relay_stream *stream; - - if (!relay_streams_ht) { - return; - } - - rcu_read_lock(); - cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream, - node.node) { - if (!stream_get(stream)) { - continue; - } - DBG("stream %p refcount %ld stream %" PRIu64 " trace %" PRIu64 - " session %" PRIu64, - stream, - stream->ref.refcount, - stream->stream_handle, - stream->trace->id, - stream->trace->session->id); - print_stream_indexes(stream); - stream_put(stream); - } - rcu_read_unlock(); -}