From: Julien Desfossez <jdesfossez@efficios.com>
Date: Mon, 14 Jul 2014 18:05:48 +0000 (-0400)
Subject: Fix: get the stream_id when generating live beacons
X-Git-Tag: v2.5.0~12
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=bb8cf449d87e8df3513925acfac31b694b87cc71;p=lttng-tools.git

Fix: get the stream_id when generating live beacons

When we send an empty index (beacon), we need to extract the stream_id
to avoid stalling the client on inactive streams on startup.
Since the live clients need to know this feature is implemented, we had
to bump the lttng-live protocol version.

This fix should be backported to stable-2.4 as well.

Refs: #811

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
---

diff --git a/src/bin/lttng-relayd/live.c b/src/bin/lttng-relayd/live.c
index d8517d2f6..8c716dbde 100644
--- a/src/bin/lttng-relayd/live.c
+++ b/src/bin/lttng-relayd/live.c
@@ -1206,6 +1206,7 @@ static int check_index_status(struct relay_viewer_stream *vstream,
 				 */
 				index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE);
 				index->timestamp_end = htobe64(rstream->beacon_ts_end);
+				index->stream_id = htobe64(rstream->ctf_stream_id);
 				goto index_ready;
 			} else if (rstream->total_index_received <= vstream->last_sent_index
 					&& !vstream->close_write_flag) {
diff --git a/src/bin/lttng-relayd/main.c b/src/bin/lttng-relayd/main.c
index ac03cf846..3a6bebaf7 100644
--- a/src/bin/lttng-relayd/main.c
+++ b/src/bin/lttng-relayd/main.c
@@ -1205,6 +1205,7 @@ int relay_add_stream(struct lttcomm_relayd_hdr *recv_hdr,
 	stream->session_id = session->id;
 	stream->index_fd = -1;
 	stream->read_index_fd = -1;
+	stream->ctf_stream_id = -1ULL;
 	lttng_ht_node_init_u64(&stream->node, stream->stream_handle);
 	pthread_mutex_init(&stream->lock, NULL);
 
@@ -1963,6 +1964,9 @@ int relay_recv_index(struct lttcomm_relayd_hdr *recv_hdr,
 	}
 
 	copy_index_control_data(index, &index_info);
+	if (stream->ctf_stream_id == -1ULL) {
+		stream->ctf_stream_id = be64toh(index_info.stream_id);
+	}
 
 	if (index_created) {
 		/*
diff --git a/src/bin/lttng-relayd/stream.h b/src/bin/lttng-relayd/stream.h
index c6bdb307e..5aca693cc 100644
--- a/src/bin/lttng-relayd/stream.h
+++ b/src/bin/lttng-relayd/stream.h
@@ -76,6 +76,10 @@ struct relay_stream {
 	 * timestamp end, when it is active, this field == -1ULL.
 	 */
 	uint64_t beacon_ts_end;
+	/*
+	 * CTF stream ID, -1ULL when unset.
+	 */
+	uint64_t ctf_stream_id;
 	/*
 	 * To protect the update of the close_write_flag and the checks of
 	 * the tracefile_count_current.
diff --git a/src/common/consumer-timer.c b/src/common/consumer-timer.c
index c659bf633..d36e2bccf 100644
--- a/src/common/consumer-timer.c
+++ b/src/common/consumer-timer.c
@@ -27,6 +27,7 @@
 #include <common/kernel-ctl/kernel-ctl.h>
 #include <common/kernel-consumer/kernel-consumer.h>
 #include <common/consumer-stream.h>
+#include <lttng/ust-ctl.h>
 
 #include "consumer-timer.h"
 #include "consumer-testpoint.h"
@@ -114,12 +115,14 @@ static void metadata_switch_timer(struct lttng_consumer_local_data *ctx,
 	}
 }
 
-static int send_empty_index(struct lttng_consumer_stream *stream, uint64_t ts)
+static int send_empty_index(struct lttng_consumer_stream *stream, uint64_t ts,
+		uint64_t stream_id)
 {
 	int ret;
 	struct ctf_packet_index index;
 
 	memset(&index, 0, sizeof(index));
+	index.stream_id = htobe64(stream_id);
 	index.timestamp_end = htobe64(ts);
 	ret = consumer_stream_write_index(stream, &index);
 	if (ret < 0) {
@@ -132,7 +135,7 @@ error:
 
 static int check_kernel_stream(struct lttng_consumer_stream *stream)
 {
-	uint64_t ts;
+	uint64_t ts, stream_id;
 	int ret;
 
 	/*
@@ -160,8 +163,13 @@ static int check_kernel_stream(struct lttng_consumer_stream *stream)
 			ret = -1;
 			goto error_unlock;
 		}
+		ret = kernctl_get_stream_id(stream->wait_fd, &stream_id);
+		if (ret < 0) {
+			PERROR("kernctl_get_stream_id");
+			goto error_unlock;
+		}
 		DBG("Stream %" PRIu64 " empty, sending beacon", stream->key);
-		ret = send_empty_index(stream, ts);
+		ret = send_empty_index(stream, ts, stream_id);
 		if (ret < 0) {
 			goto error_unlock;
 		}
@@ -175,7 +183,7 @@ error_unlock:
 
 static int check_ust_stream(struct lttng_consumer_stream *stream)
 {
-	uint64_t ts;
+	uint64_t ts, stream_id;
 	int ret;
 
 	assert(stream);
@@ -206,8 +214,13 @@ static int check_ust_stream(struct lttng_consumer_stream *stream)
 			ret = -1;
 			goto error_unlock;
 		}
+		ret = ustctl_get_stream_id(stream->ustream, &stream_id);
+		if (ret < 0) {
+			PERROR("ustctl_get_stream_id");
+			goto error_unlock;
+		}
 		DBG("Stream %" PRIu64 " empty, sending beacon", stream->key);
-		ret = send_empty_index(stream, ts);
+		ret = send_empty_index(stream, ts, stream_id);
 		if (ret < 0) {
 			goto error_unlock;
 		}