Implement the relayd live features

[lttng-tools.git] / src / bin / lttng-relayd / lttng-relayd.h

diff --git a/src/bin/lttng-relayd/lttng-relayd.h b/src/bin/lttng-relayd/lttng-relayd.h
index 8bbc279c3a61f993f322988935b1847976e9ccf0..638ecbbea2b6d0f8863e27a52c4dad45b846d1e6 100644 (file)
--- a/src/bin/lttng-relayd/lttng-relayd.h
+++ b/src/bin/lttng-relayd/lttng-relayd.h
@@ -20,9 +20,15 @@
 #define LTTNG_RELAYD_H
 
 #define _LGPL_SOURCE
+#include <limits.h>
 #include <urcu.h>
 #include <urcu/wfqueue.h>
 
+#include <common/hashtable/hashtable.h>
+#include <common/index/lttng-index.h>
+
+#include "ctf-trace.h"
+
 /*
  * Queue used to enqueue relay requests
  */
@@ -34,15 +40,28 @@ struct relay_cmd_queue {
 enum connection_type {
        RELAY_DATA,
        RELAY_CONTROL,
+       RELAY_VIEWER_COMMAND,
+       RELAY_VIEWER_NOTIFICATION,
 };
 
 /*
  * Represents a session for the relay point of view
  */
 struct relay_session {
+       /*
+        * This session id is used to identify a set of stream to a tracing session
+        * but also make sure we have a unique session id associated with a session
+        * daemon which can provide multiple data source.
+        */
        uint64_t id;
        struct lttcomm_sock *sock;
-       unsigned int version_check_done:1;
+       char session_name[NAME_MAX];
+       char hostname[HOST_NAME_MAX];
+       uint32_t live_timer;
+       struct lttng_ht_node_ulong session_n;
+       struct rcu_head rcu_node;
+       uint32_t viewer_attached;
+       uint32_t stream_count;
 };
 
 /*
@@ -50,10 +69,75 @@ struct relay_session {
  */
 struct relay_stream {
        uint64_t stream_handle;
-       uint64_t seq;
+       uint64_t prev_seq;      /* previous data sequence number encountered */
        struct lttng_ht_node_ulong stream_n;
        struct relay_session *session;
+       struct rcu_head rcu_node;
        int fd;
+       /* FD on which to write the index data. */
+       int index_fd;
+       /* FD on which to read the index data for the viewer. */
+       int read_index_fd;
+
+       char *path_name;
+       char *channel_name;
+       /* on-disk circular buffer of tracefiles */
+       uint64_t tracefile_size;
+       uint64_t tracefile_size_current;
+       uint64_t tracefile_count;
+       uint64_t tracefile_count_current;
+
+       uint64_t total_index_received;
+       struct relay_viewer_stream *viewer_stream;
+       uint64_t last_net_seq_num;
+       struct lttng_ht_node_str ctf_trace_node;
+
+       /*
+        * To protect from concurrent read/update between the
+        * streaming-side and the viewer-side.
+        * This lock must be held, we reading/updating the
+        * ctf_trace pointer.
+        */
+       pthread_mutex_t lock;
+
+       struct ctf_trace *ctf_trace;
+       /*
+        * If the stream is inactive, this field is updated with the live beacon
+        * timestamp end, when it is active, this field == -1ULL.
+        */
+       uint64_t beacon_ts_end;
+
+       /* Information telling us when to close the stream  */
+       unsigned int close_flag:1;
+       /* Indicate if the stream was initialized for a data pending command. */
+       unsigned int data_pending_check_done:1;
+       unsigned int metadata_flag:1;
+};
+
+/*
+ * Shadow copy of the relay_stream structure for the viewer side.  The only
+ * fields updated by the writer (streaming side) after allocation are :
+ * total_index_received and close_flag. Everything else is updated by the
+ * reader (viewer side).
+ */
+struct relay_viewer_stream {
+       uint64_t stream_handle;
+       uint64_t session_id;
+       int read_fd;
+       int index_read_fd;
+       char *path_name;
+       char *channel_name;
+       uint64_t last_sent_index;
+       uint64_t total_index_received;
+       uint64_t tracefile_size;
+       uint64_t tracefile_size_current;
+       uint64_t tracefile_count;
+       uint64_t tracefile_count_current;
+       struct lttng_ht_node_u64 stream_n;
+       struct rcu_head rcu_node;
+       struct ctf_trace *ctf_trace;
+       /* Information telling us if the stream is a metadata stream. */
+       unsigned int metadata_flag:1;
 };
 
 /*
@@ -65,7 +149,24 @@ struct relay_command {
        struct relay_session *session;
        struct cds_wfq_node node;
        struct lttng_ht_node_ulong sock_n;
+       struct rcu_head rcu_node;
        enum connection_type type;
+       unsigned int version_check_done:1;
+       /* protocol version to use for this session */
+       uint32_t major;
+       uint32_t minor;
+       struct lttng_ht *ctf_traces_ht; /* indexed by path name */
 };
 
+struct relay_local_data {
+       struct lttng_ht *sessions_ht;
+       struct lttng_ht *viewer_streams_ht;
+};
+
+extern char *opt_output_path;
+
+extern struct lttng_ht *relay_streams_ht;
+
+struct relay_stream *relay_stream_find_by_id(uint64_t stream_id);
+
 #endif /* LTTNG_RELAYD_H */