+++ /dev/null
-/*
- * 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
- *
- */
-
-#define _LGPL_SOURCE
-#include <common/common.h>
-#include <common/index/index.h>
-#include <common/compat/string.h>
-#include <common/utils.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-
-#include "lttng-relayd.h"
-#include "viewer-stream.h"
-
-static void viewer_stream_destroy(struct relay_viewer_stream *vstream)
-{
- lttng_trace_chunk_put(vstream->stream_file.trace_chunk);
- 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);
-}
-
-/* Relay stream's lock must be held by the caller. */
-struct relay_viewer_stream *viewer_stream_create(struct relay_stream *stream,
- struct lttng_trace_chunk *trace_chunk,
- enum lttng_viewer_seek seek_t)
-{
- struct relay_viewer_stream *vstream = NULL;
-
- ASSERT_LOCKED(stream->lock);
-
- vstream = zmalloc(sizeof(*vstream));
- if (!vstream) {
- PERROR("relay viewer stream zmalloc");
- goto error;
- }
-
- if (trace_chunk) {
- const bool acquired_reference = lttng_trace_chunk_get(
- trace_chunk);
-
- LTTNG_ASSERT(acquired_reference);
- }
-
- vstream->stream_file.trace_chunk = trace_chunk;
- vstream->path_name = lttng_strndup(stream->path_name, LTTNG_VIEWER_PATH_MAX);
- if (vstream->path_name == NULL) {
- PERROR("relay viewer path_name alloc");
- goto error;
- }
- vstream->channel_name = lttng_strndup(stream->channel_name,
- LTTNG_VIEWER_NAME_MAX);
- if (vstream->channel_name == NULL) {
- PERROR("relay viewer channel_name alloc");
- goto error;
- }
-
- if (!stream_get(stream)) {
- ERR("Cannot get stream");
- goto error;
- }
- vstream->stream = stream;
-
- if (stream->is_metadata && stream->trace->viewer_metadata_stream) {
- ERR("Cannot attach viewer metadata stream to trace (busy).");
- goto error;
- }
-
- switch (seek_t) {
- case LTTNG_VIEWER_SEEK_BEGINNING:
- {
- uint64_t seq_tail = tracefile_array_get_seq_tail(stream->tfa);
-
- if (seq_tail == -1ULL) {
- /*
- * Tail may not be initialized yet. Nonetheless, we know
- * we want to send the first index once it becomes
- * available.
- */
- seq_tail = 0;
- }
- vstream->current_tracefile_id =
- tracefile_array_get_file_index_tail(stream->tfa);
- vstream->index_sent_seqcount = seq_tail;
- break;
- }
- case LTTNG_VIEWER_SEEK_LAST:
- vstream->current_tracefile_id =
- tracefile_array_get_read_file_index_head(stream->tfa);
- /*
- * We seek at the very end of each stream, awaiting for
- * a future packet to eventually come in.
- *
- * We don't need to check the head position for -1ULL since the
- * increment will set it to 0.
- */
- vstream->index_sent_seqcount =
- tracefile_array_get_seq_head(stream->tfa) + 1;
- break;
- default:
- goto error;
- }
-
- /*
- * If we never received an index for the current stream, delay
- * the opening of the index, otherwise open it right now.
- */
- if (stream->index_file == NULL) {
- vstream->index_file = NULL;
- } else if (vstream->stream_file.trace_chunk) {
- const uint32_t connection_major = stream->trace->session->major;
- const uint32_t connection_minor = stream->trace->session->minor;
- enum lttng_trace_chunk_status chunk_status;
-
- chunk_status = lttng_index_file_create_from_trace_chunk_read_only(
- vstream->stream_file.trace_chunk,
- stream->path_name,
- stream->channel_name, stream->tracefile_size,
- vstream->current_tracefile_id,
- lttng_to_index_major(connection_major,
- connection_minor),
- lttng_to_index_minor(connection_major,
- connection_minor),
- true, &vstream->index_file);
- if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
- if (chunk_status == LTTNG_TRACE_CHUNK_STATUS_NO_FILE) {
- vstream->index_file = NULL;
- } else {
- goto error;
- }
- }
- }
-
- /*
- * If we never received a data file for the current stream, delay the
- * opening, otherwise open it right now.
- */
- if (stream->file && vstream->stream_file.trace_chunk) {
- int ret;
- char file_path[LTTNG_PATH_MAX];
- enum lttng_trace_chunk_status status;
-
- ret = utils_stream_file_path(stream->path_name,
- stream->channel_name, stream->tracefile_size,
- vstream->current_tracefile_id, NULL, file_path,
- sizeof(file_path));
- if (ret < 0) {
- goto error;
- }
-
- status = lttng_trace_chunk_open_fs_handle(
- vstream->stream_file.trace_chunk, file_path,
- O_RDONLY, 0, &vstream->stream_file.handle,
- true);
- if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
- goto error;
- }
- }
-
- if (seek_t == LTTNG_VIEWER_SEEK_LAST && vstream->index_file) {
- off_t lseek_ret;
-
- lseek_ret = fs_handle_seek(
- vstream->index_file->file, 0, SEEK_END);
- if (lseek_ret < 0) {
- goto error;
- }
- }
- if (stream->is_metadata) {
- rcu_assign_pointer(stream->trace->viewer_metadata_stream,
- vstream);
- }
-
- vstream->last_seen_rotation_count = stream->completed_rotation_count;
-
- /* Globally visible after the add unique. */
- lttng_ht_node_init_u64(&vstream->stream_n, stream->stream_handle);
- urcu_ref_init(&vstream->ref);
- lttng_ht_add_unique_u64(viewer_streams_ht, &vstream->stream_n);
-
- return vstream;
-
-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);
- LTTNG_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_file.handle) {
- fs_handle_close(vstream->stream_file.handle);
- vstream->stream_file.handle = NULL;
- }
- if (vstream->index_file) {
- lttng_index_file_put(vstream->index_file);
- vstream->index_file = NULL;
- }
- if (vstream->stream) {
- stream_put(vstream->stream);
- vstream->stream = NULL;
- }
- lttng_trace_chunk_put(vstream->stream_file.trace_chunk);
- vstream->stream_file.trace_chunk = 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)
-{
- return urcu_ref_get_unless_zero(&vstream->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();
- urcu_ref_put(&vstream->ref, viewer_stream_release);
- rcu_read_unlock();
-}
-
-void viewer_stream_close_files(struct relay_viewer_stream *vstream)
-{
- if (vstream->index_file) {
- lttng_index_file_put(vstream->index_file);
- vstream->index_file = NULL;
- }
- if (vstream->stream_file.handle) {
- fs_handle_close(vstream->stream_file.handle);
- vstream->stream_file.handle = NULL;
- }
-}
-
-void viewer_stream_sync_tracefile_array_tail(struct relay_viewer_stream *vstream)
-{
- const struct relay_stream *stream = vstream->stream;
- uint64_t seq_tail;
-
- vstream->current_tracefile_id = tracefile_array_get_file_index_tail(stream->tfa);
- seq_tail = tracefile_array_get_seq_tail(stream->tfa);
- if (seq_tail == -1ULL) {
- seq_tail = 0;
- }
- vstream->index_sent_seqcount = seq_tail;
-}
-
-/*
- * Rotate a stream to the next tracefile.
- *
- * Must be called with the rstream lock held.
- * Returns 0 on success, 1 on EOF.
- */
-int viewer_stream_rotate(struct relay_viewer_stream *vstream)
-{
- int ret;
- uint64_t new_id;
- const struct relay_stream *stream = vstream->stream;
-
- /* Detect the last tracefile to open. */
- if (stream->index_received_seqcount
- == vstream->index_sent_seqcount
- && 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;
- }
-
- /*
- * Try to move to the next file.
- */
- new_id = (vstream->current_tracefile_id + 1)
- % stream->tracefile_count;
- if (tracefile_array_seq_in_file(stream->tfa, new_id,
- vstream->index_sent_seqcount)) {
- vstream->current_tracefile_id = new_id;
- } else {
- uint64_t seq_tail = tracefile_array_get_seq_tail(stream->tfa);
-
- /*
- * This can only be reached on overwrite, which implies there
- * has been data written at some point, which will have set the
- * tail.
- */
- LTTNG_ASSERT(seq_tail != -1ULL);
- /*
- * We need to resync because we lag behind tail.
- */
- vstream->current_tracefile_id =
- tracefile_array_get_file_index_tail(stream->tfa);
- vstream->index_sent_seqcount = seq_tail;
- }
- viewer_stream_close_files(vstream);
- ret = 0;
-end:
- return ret;
-}
-
-void print_viewer_streams(void)
-{
- struct lttng_ht_iter iter;
- struct relay_viewer_stream *vstream;
-
- if (!viewer_streams_ht) {
- return;
- }
-
- 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