#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
*/
};
enum connection_type {
- RELAY_DATA,
- RELAY_CONTROL,
+ RELAY_DATA = 1,
+ RELAY_CONTROL = 2,
+ RELAY_VIEWER_COMMAND = 3,
+ RELAY_VIEWER_NOTIFICATION = 4,
};
/*
* 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;
+ /* Tell if this session is for a snapshot or not. */
+ unsigned int snapshot:1;
+
+ /*
+ * Indicate version protocol for this session. This is especially useful
+ * for the data thread that has no idea which version it operates on since
+ * linking control/data sockets is non trivial.
+ */
+ uint64_t minor;
+ uint64_t major;
};
/*
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;
+ /* To inform the viewer up to where it can go back in time. */
+ uint64_t oldest_tracefile_id;
+
+ uint64_t total_index_received;
+ struct relay_viewer_stream *viewer_stream;
+ uint64_t last_net_seq_num;
+
+ /*
+ * This node is added to the *control* connection hash table and the
+ * pointer is copied in here so we can access it when deleting this object.
+ * When deleting this, the ctf trace ht MUST NOT be destroyed. This happens
+ * at connection deletion.
+ */
+ struct lttng_ht_node_str ctf_trace_node;
+ struct lttng_ht *ctf_traces_ht;
+
+ /*
+ * 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;
+ /*
+ * To protect the update of the close_write_flag and the checks of
+ * the tracefile_count_current.
+ * It is taken before checking whenever we need to know if the
+ * writer and reader are working in the same tracefile.
+ */
+ pthread_mutex_t viewer_stream_rotation_lock;
/* Information telling us when to close the stream */
unsigned int close_flag:1;
- uint64_t last_net_seq_num;
+ /* Indicate if the stream was initialized for a data pending command. */
+ unsigned int data_pending_check_done:1;
+ unsigned int metadata_flag:1;
+ /*
+ * To detect when we start overwriting old data, it is used to
+ * update the oldest_tracefile_id.
+ */
+ unsigned int tracefile_overwrite: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_count;
+ uint64_t tracefile_count_current;
+ struct lttng_ht_node_u64 stream_n;
+ struct rcu_head rcu_node;
+ struct ctf_trace *ctf_trace;
+ /*
+ * This lock blocks only when the writer is about to start overwriting
+ * a file currently read by the reader.
+ */
+ pthread_mutex_t overwrite_lock;
+ /* Information telling us if the stream is a metadata stream. */
+ unsigned int metadata_flag:1;
+ /*
+ * Information telling us that the stream is closed in write, so
+ * we don't expect new indexes and we can read up to EOF.
+ */
+ unsigned int close_write_flag:1;
+ /*
+ * If the streaming side closes a FD in use in the viewer side,
+ * it sets this flag to inform that it is a normal error.
+ */
+ unsigned int abort_flag:1;
};
/*
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 */
+ uint64_t session_id;
};
+struct relay_local_data {
+ struct lttng_ht *sessions_ht;
+};
+
+extern char *opt_output_path;
+
+extern struct lttng_ht *relay_streams_ht;
+extern struct lttng_ht *viewer_streams_ht;
+extern struct lttng_ht *indexes_ht;
+
+extern const char *tracing_group_name;
+
+struct relay_stream *relay_stream_find_by_id(uint64_t stream_id);
+
#endif /* LTTNG_RELAYD_H */
projects / lttng-tools.git / blobdiff