src/bin/lttng-relayd/stream.hpp

   1 #ifndef _STREAM_H
   2 #define _STREAM_H
   3
   4 /*
   5  * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com>
   6  * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
   7  * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * SPDX-License-Identifier: GPL-2.0-only
  10  *
  11  */
  12
  13 #include "session.hpp"
  14 #include "tracefile-array.hpp"
  15
  16 #include <common/buffer-view.hpp>
  17 #include <common/hashtable/hashtable.hpp>
  18 #include <common/optional.hpp>
  19 #include <common/trace-chunk.hpp>
  20
  21 #include <inttypes.h>
  22 #include <limits.h>
  23 #include <pthread.h>
  24 #include <urcu/list.h>
  25
  26 struct lttcomm_relayd_index;
  27
  28 struct relay_stream_rotation {
  29         /*
  30          * Indicates if the stream's data and index have been rotated. A
  31          * rotation is considered completed when both rotations have occurred.
  32          */
  33         bool data_rotated;
  34         bool index_rotated;
  35         /*
  36          * Packet sequence number of the first packet of the new trace chunk to
  37          * which the stream is rotating.
  38          */
  39         uint64_t packet_seq_num;
  40         /*
  41          * Monotonically increasing previous network sequence number of first
  42          * data packet of the new trace chunk to which the stream is rotating.
  43          */
  44         uint64_t prev_data_net_seq;
  45         struct lttng_trace_chunk *next_trace_chunk;
  46 };
  47
  48 /*
  49  * Represents a stream in the relay
  50  */
  51 struct relay_stream {
  52         uint64_t stream_handle;
  53
  54         struct urcu_ref ref;
  55         /* Back reference to trace. Protected by refcount on trace object. */
  56         struct ctf_trace *trace;
  57
  58         /*
  59          * To protect from concurrent read/update.The stream lock nests
  60          * inside the ctf_trace lock.
  61          */
  62         pthread_mutex_t lock;
  63         /* previous data sequence number written to disk. */
  64         uint64_t prev_data_seq;
  65         /* previous index sequence number written to disk. */
  66         uint64_t prev_index_seq;
  67         /* seq num to encounter before closing. */
  68         uint64_t last_net_seq_num;
  69
  70         struct fs_handle *file;
  71         /* index file on which to write the index data. */
  72         struct lttng_index_file *index_file;
  73
  74         char *path_name;
  75         char *channel_name;
  76
  77         /* On-disk circular buffer of tracefiles. */
  78         uint64_t tracefile_size;
  79         uint64_t tracefile_size_current;
  80         /* Max number of trace files for this stream. */
  81         uint64_t tracefile_count;
  82         /*
  83          * Index of the currently active file for this stream's on-disk
  84          * ring buffer.
  85          */
  86         uint64_t tracefile_current_index;
  87         /*
  88          * Indicates that the on-disk buffer has wrapped around. Stream
  89          * files shall be unlinked before being opened after this has occurred.
  90          */
  91         bool tracefile_wrapped_around;
  92
  93         /*
  94          * Position in the tracefile where we have the full index also on disk.
  95          */
  96         uint64_t pos_after_last_complete_data_index;
  97
  98         /*
  99          * Counts the number of received indexes. The "tag" associated
 100          * with an index is taken before incrementing this seqcount.
 101          * Therefore, the sequence tag associated with the last index
 102          * received is always index_received_seqcount - 1.
 103          */
 104         uint64_t index_received_seqcount;
 105
 106         /*
 107          * Packet sequence number of the last received packet index.
 108          * Only populated when interacting with CTF_INDEX 1.1+.
 109          */
 110         LTTNG_OPTIONAL(uint64_t) received_packet_seq_num;
 111
 112         /*
 113          * Tracefile array is an index of the stream trace files,
 114          * indexed by position. It allows keeping track of the oldest
 115          * available indexes when overwriting trace files in tracefile
 116          * rotation.
 117          */
 118         struct tracefile_array *tfa;
 119
 120         bool closed; /* Stream is closed. */
 121         bool close_requested; /* Close command has been received. */
 122
 123         /*
 124          * Counts number of indexes in indexes_ht. Redundant info.
 125          * Protected by stream lock.
 126          */
 127         int indexes_in_flight;
 128         struct lttng_ht *indexes_ht;
 129
 130         /*
 131          * If the stream is inactive, this field is updated with the
 132          * live beacon timestamp end, when it is active, this
 133          * field == -1ULL.
 134          */
 135         uint64_t beacon_ts_end;
 136
 137         /* CTF stream ID, -1ULL when unset (first packet not received yet). */
 138         uint64_t ctf_stream_id;
 139
 140         /* Indicate if the stream was initialized for a data pending command. */
 141         bool data_pending_check_done;
 142
 143         /* Is this stream a metadata stream ? */
 144         bool is_metadata;
 145         /* Amount of metadata received (bytes). */
 146         uint64_t metadata_received;
 147
 148         /*
 149          * Member of the stream list in struct ctf_trace.
 150          * Updates are protected by the stream_list_lock.
 151          * Traversals are protected by RCU.
 152          */
 153         struct cds_list_head stream_node;
 154         /*
 155          * Temporary list belonging to the connection until all streams
 156          * are received for that connection.
 157          * Member of the stream recv list in the connection.
 158          * Updates are protected by the stream_recv_list_lock.
 159          * Traversals are protected by RCU.
 160          */
 161         bool in_recv_list;
 162         struct cds_list_head recv_node;
 163         /* Protected by session lock. */
 164         bool published;
 165         /* Notified viewer that no new metadata is available. */
 166         bool no_new_metadata_notified;
 167         /*
 168          * Node of stream within global stream hash table.
 169          */
 170         struct lttng_ht_node_u64 node;
 171         bool in_stream_ht; /* is stream in stream hash table. */
 172         struct rcu_head rcu_node; /* For call_rcu teardown. */
 173         /*
 174          * The trace chunk to which the file currently being produced (if any)
 175          * belongs.
 176          *
 177          * Note that a relay stream can have no output trace chunk. For
 178          * instance, after a session stop followed by a session clear,
 179          * streams will not have an output trace chunk until the session
 180          * is resumed.
 181          */
 182         struct lttng_trace_chunk *trace_chunk;
 183         LTTNG_OPTIONAL(struct relay_stream_rotation) ongoing_rotation;
 184         uint64_t completed_rotation_count;
 185 };
 186
 187 struct relay_stream *stream_create(struct ctf_trace *trace,
 188                                    uint64_t stream_handle,
 189                                    char *path_name,
 190                                    char *channel_name,
 191                                    uint64_t tracefile_size,
 192                                    uint64_t tracefile_count);
 193
 194 struct relay_stream *stream_get_by_id(uint64_t stream_id);
 195 bool stream_get(struct relay_stream *stream);
 196 void stream_put(struct relay_stream *stream);
 197 int stream_rotate_output_files(struct relay_session *session, struct relay_stream *stream);
 198 int stream_set_pending_rotation(struct relay_stream *stream,
 199                                 struct lttng_trace_chunk *next_trace_chunk,
 200                                 uint64_t rotation_sequence_number);
 201 void try_stream_close(struct relay_stream *stream);
 202 void stream_publish(struct relay_stream *stream);
 203 int stream_init_packet(struct relay_stream *stream, size_t packet_size, bool *file_rotated);
 204 int stream_write(struct relay_stream *stream,
 205                  const struct lttng_buffer_view *packet,
 206                  size_t padding_len);
 207 /* Called after the reception of a complete data packet. */
 208 int stream_update_index(struct relay_stream *stream,
 209                         uint64_t net_seq_num,
 210                         bool rotate_index,
 211                         bool *flushed,
 212                         uint64_t total_size);
 213 int stream_complete_packet(struct relay_stream *stream,
 214                            size_t packet_total_size,
 215                            uint64_t sequence_number,
 216                            bool index_flushed);
 217 /* Index info is in host endianness. */
 218 int stream_add_index(struct relay_stream *stream, const struct lttcomm_relayd_index *index_info);
 219 int stream_reset_file(struct relay_stream *stream);
 220
 221 void print_relay_streams(void);
 222
 223 #endif /* _STREAM_H */