X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-relayd%2Fviewer-stream.hpp;fp=src%2Fbin%2Flttng-relayd%2Fviewer-stream.hpp;h=42bdc1e208be4ac2a06bdc80ce6bd5b6f2ef4f96;hp=0000000000000000000000000000000000000000;hb=c9e313bc594f40a86eed237dce222c0fc99c957f;hpb=4878de5c7deb512bbdac4fdfc498907efa06fb7c

diff --git a/src/bin/lttng-relayd/viewer-stream.hpp b/src/bin/lttng-relayd/viewer-stream.hpp
new file mode 100644
index 000000000..42bdc1e20
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+++ b/src/bin/lttng-relayd/viewer-stream.hpp
@@ -0,0 +1,94 @@
+#ifndef _VIEWER_STREAM_H
+#define _VIEWER_STREAM_H
+
+/*
+ * 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
+ *
+ */
+
+#include <limits.h>
+#include <inttypes.h>
+#include <pthread.h>
+
+#include <common/hashtable/hashtable.hpp>
+
+#include "ctf-trace.hpp"
+#include "lttng-viewer-abi.hpp"
+#include "stream.hpp"
+
+struct relay_stream;
+
+/*
+ * The viewer stream's lifetime is the intersection of their viewer connection's
+ * lifetime and the duration during which at least:
+ * a) their input source is still active
+ * b) they still have data left to send to the client.
+ *
+ * This means that both the sessiond/consumerd connection or the viewer
+ * connection may tear down (and unpublish) a relay_viewer_stream.
+ *
+ * Viewer stream updates are protected by their associated stream's lock.
+ */
+struct relay_viewer_stream {
+	struct urcu_ref ref;
+
+	/* Back ref to stream. */
+	struct relay_stream *stream;
+
+	struct {
+		struct fs_handle *handle;
+		struct lttng_trace_chunk *trace_chunk;
+	} stream_file;
+	/* index file from which to read the index data. */
+	struct lttng_index_file *index_file;
+	/*
+	 * Last seen rotation count in stream.
+	 *
+	 * Sampled on every change to the viewer stream trace chunk,
+	 * this allows the live server to determine if it saw the latest
+	 * rotation that occurred on the receiving end.
+	 */
+	uint64_t last_seen_rotation_count;
+
+	char *path_name;
+	char *channel_name;
+
+	uint64_t current_tracefile_id;
+
+	/*
+	 * Counts the number of sent indexes. The "tag" associated
+	 * with an index to send is the current index_received_seqcount,
+	 * because we increment index_received_seqcount after sending
+	 * each index. This index_received_seqcount counter can also be
+	 * updated when catching up with the producer.
+	 */
+	uint64_t index_sent_seqcount;
+
+	/* Indicates if this stream has been sent to a viewer client. */
+	bool sent_flag;
+	/* For metadata stream, how much metadata has been sent. */
+	uint64_t metadata_sent;
+
+	struct lttng_ht_node_u64 stream_n;
+	struct rcu_head rcu_node;
+};
+
+struct relay_viewer_stream *viewer_stream_create(struct relay_stream *stream,
+		struct lttng_trace_chunk *viewer_trace_chunk,
+		enum lttng_viewer_seek seek_t);
+
+struct relay_viewer_stream *viewer_stream_get_by_id(uint64_t id);
+bool viewer_stream_get(struct relay_viewer_stream *vstream);
+void viewer_stream_put(struct relay_viewer_stream *vstream);
+int viewer_stream_rotate(struct relay_viewer_stream *vstream);
+bool viewer_stream_is_tracefile_seq_readable(struct relay_viewer_stream *vstream,
+		uint64_t seq);
+void print_viewer_streams(void);
+void viewer_stream_close_files(struct relay_viewer_stream *vstream);
+void viewer_stream_sync_tracefile_array_tail(struct relay_viewer_stream *vstream);
+
+#endif /* _VIEWER_STREAM_H */