src/plugins/ctf/fs-src/data-stream-file.hpp

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright (C) 2016 Philippe Proulx <pproulx@efficios.com>
   5  */
   6
   7 #ifndef CTF_FS_DS_FILE_H
   8 #define CTF_FS_DS_FILE_H
   9
  10 #include <memory>
  11 #include <string>
  12 #include <vector>
  13
  14 #include <glib.h>
  15 #include <stdio.h>
  16
  17 #include <babeltrace2/babeltrace.h>
  18
  19 #include "cpp-common/bt2c/data-len.hpp"
  20 #include "cpp-common/bt2c/logging.hpp"
  21
  22 #include "../common/src/msg-iter/msg-iter.hpp"
  23
  24 struct ctf_fs_ds_file_info
  25 {
  26     using UP = std::unique_ptr<ctf_fs_ds_file_info>;
  27
  28     std::string path;
  29
  30     /* Guaranteed to be set, as opposed to the index. */
  31     int64_t begin_ns = 0;
  32 };
  33
  34 struct ctf_fs_ds_file
  35 {
  36     explicit ctf_fs_ds_file(const bt2c::Logger& parentLogger) :
  37         logger {parentLogger, "PLUGIN/SRC.CTF.FS/DS"}
  38     {
  39     }
  40
  41     bt2c::Logger logger;
  42
  43     /* Weak */
  44     struct ctf_fs_metadata *metadata = nullptr;
  45
  46     /* Owned by this */
  47     struct ctf_fs_file *file = nullptr;
  48
  49     /* Owned by this */
  50     bt_stream *stream = nullptr;
  51
  52     void *mmap_addr = nullptr;
  53
  54     /*
  55      * Max length of chunk to mmap() when updating the current mapping.
  56      * This value must be page-aligned.
  57      */
  58     size_t mmap_max_len = 0;
  59
  60     /* Length of the current mapping. Never exceeds the file's length. */
  61     size_t mmap_len = 0;
  62
  63     /* Offset in the file where the current mapping starts. */
  64     off_t mmap_offset_in_file = 0;
  65
  66     /*
  67      * Offset, in the current mapping, of the address to return on the next
  68      * request.
  69      */
  70     off_t request_offset_in_mapping = 0;
  71 };
  72
  73 struct ctf_fs_ds_index_entry
  74 {
  75     using UP = std::unique_ptr<ctf_fs_ds_index_entry>;
  76
  77     explicit ctf_fs_ds_index_entry(const bt2c::DataLen offsetParam,
  78                                    const bt2c::DataLen packetSizeParam) noexcept :
  79         offset(offsetParam),
  80         packetSize(packetSizeParam)
  81     {
  82     }
  83
  84     /* Weak, belongs to ctf_fs_ds_file_info. */
  85     const char *path = nullptr;
  86
  87     /* Position of the packet from the beginning of the file. */
  88     bt2c::DataLen offset;
  89
  90     /* Size of the packet. */
  91     bt2c::DataLen packetSize;
  92
  93     /*
  94      * Extracted from the packet context, relative to the respective fields'
  95      * mapped clock classes (in cycles).
  96      */
  97     uint64_t timestamp_begin = 0, timestamp_end = 0;
  98
  99     /*
 100      * Converted from the packet context, relative to the trace's EPOCH
 101      * (in ns since EPOCH).
 102      */
 103     int64_t timestamp_begin_ns = 0, timestamp_end_ns = 0;
 104
 105     /*
 106      * Packet sequence number, or UINT64_MAX if not present in the index.
 107      */
 108     uint64_t packet_seq_num = 0;
 109 };
 110
 111 struct ctf_fs_ds_index_deleter
 112 {
 113     void operator()(struct ctf_fs_ds_index *index) noexcept;
 114 };
 115
 116 struct ctf_fs_ds_index
 117 {
 118     using UP = std::unique_ptr<ctf_fs_ds_index, ctf_fs_ds_index_deleter>;
 119
 120     std::vector<ctf_fs_ds_index_entry::UP> entries;
 121 };
 122
 123 struct ctf_fs_ds_file_group_deleter
 124 {
 125     void operator()(struct ctf_fs_ds_file_group *group) noexcept;
 126 };
 127
 128 struct ctf_fs_ds_file_group
 129 {
 130     using UP = std::unique_ptr<ctf_fs_ds_file_group, ctf_fs_ds_file_group_deleter>;
 131
 132     /*
 133      * This is an _ordered_ array of data stream file infos which
 134      * belong to this group (a single stream instance).
 135      *
 136      * You can call ctf_fs_ds_file_create() with one of those paths
 137      * and the trace IR stream below.
 138      */
 139     std::vector<ctf_fs_ds_file_info::UP> ds_file_infos;
 140
 141     /* Owned by this */
 142     struct ctf_stream_class *sc = nullptr;
 143
 144     /* Owned by this */
 145     bt_stream *stream = nullptr;
 146
 147     /* Stream (instance) ID; -1ULL means none */
 148     uint64_t stream_id = 0;
 149
 150     /* Weak, belongs to component */
 151     struct ctf_fs_trace *ctf_fs_trace = nullptr;
 152
 153     ctf_fs_ds_index::UP index;
 154 };
 155
 156 struct ctf_fs_ds_file *ctf_fs_ds_file_create(struct ctf_fs_trace *ctf_fs_trace, bt_stream *stream,
 157                                              const char *path, const bt2c::Logger& logger);
 158
 159 void ctf_fs_ds_file_destroy(struct ctf_fs_ds_file *stream);
 160
 161 ctf_fs_ds_index::UP ctf_fs_ds_file_build_index(struct ctf_fs_ds_file *ds_file,
 162                                                struct ctf_fs_ds_file_info *ds_file_info,
 163                                                struct ctf_msg_iter *msg_iter);
 164
 165 ctf_fs_ds_index::UP ctf_fs_ds_index_create();
 166
 167 void ctf_fs_ds_index_destroy(struct ctf_fs_ds_index *index);
 168
 169 ctf_fs_ds_file_info::UP ctf_fs_ds_file_info_create(const char *path, int64_t begin_ns);
 170
 171 ctf_fs_ds_file_group::UP ctf_fs_ds_file_group_create(struct ctf_fs_trace *ctf_fs_trace,
 172                                                      struct ctf_stream_class *sc,
 173                                                      uint64_t stream_instance_id,
 174                                                      ctf_fs_ds_index::UP index);
 175
 176 /*
 177  * Medium operations to iterate on a single ctf_fs_ds_file.
 178  *
 179  * The data pointer when using this must be a pointer to the ctf_fs_ds_file.
 180  */
 181 extern struct ctf_msg_iter_medium_ops ctf_fs_ds_file_medops;
 182
 183 /*
 184  * Medium operations to iterate on the packet of a ctf_fs_ds_group.
 185  *
 186  * The iteration is done based on the index of the group.
 187  *
 188  * The data pointer when using these medops must be a pointer to a ctf_fs_ds
 189  * group_medops_data structure.
 190  */
 191 extern struct ctf_msg_iter_medium_ops ctf_fs_ds_group_medops;
 192
 193 enum ctf_msg_iter_medium_status ctf_fs_ds_group_medops_data_create(
 194     struct ctf_fs_ds_file_group *ds_file_group, bt_self_message_iterator *self_msg_iter,
 195     const bt2c::Logger& logger, struct ctf_fs_ds_group_medops_data **out);
 196
 197 void ctf_fs_ds_group_medops_data_reset(struct ctf_fs_ds_group_medops_data *data);
 198
 199 void ctf_fs_ds_group_medops_data_destroy(struct ctf_fs_ds_group_medops_data *data);
 200
 201 #endif /* CTF_FS_DS_FILE_H */