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     explicit ctf_fs_ds_index_entry(const bt2c::DataLen offsetParam,
  76                                    const bt2c::DataLen packetSizeParam) noexcept :
  77         offset(offsetParam),
  78         packetSize(packetSizeParam)
  79     {
  80     }
  81
  82     /* Weak, belongs to ctf_fs_ds_file_info. */
  83     const char *path = nullptr;
  84
  85     /* Position of the packet from the beginning of the file. */
  86     bt2c::DataLen offset;
  87
  88     /* Size of the packet. */
  89     bt2c::DataLen packetSize;
  90
  91     /*
  92      * Extracted from the packet context, relative to the respective fields'
  93      * mapped clock classes (in cycles).
  94      */
  95     uint64_t timestamp_begin = 0, timestamp_end = 0;
  96
  97     /*
  98      * Converted from the packet context, relative to the trace's EPOCH
  99      * (in ns since EPOCH).
 100      */
 101     int64_t timestamp_begin_ns = 0, timestamp_end_ns = 0;
 102
 103     /*
 104      * Packet sequence number, or UINT64_MAX if not present in the index.
 105      */
 106     uint64_t packet_seq_num = 0;
 107 };
 108
 109 struct ctf_fs_ds_index
 110 {
 111     /* Array of pointer to struct ctf_fs_ds_index_entry. */
 112     GPtrArray *entries = nullptr;
 113 };
 114
 115 struct ctf_fs_ds_file_group_deleter
 116 {
 117     void operator()(struct ctf_fs_ds_file_group *group) noexcept;
 118 };
 119
 120 struct ctf_fs_ds_file_group
 121 {
 122     using UP = std::unique_ptr<ctf_fs_ds_file_group, ctf_fs_ds_file_group_deleter>;
 123
 124     /*
 125      * This is an _ordered_ array of data stream file infos which
 126      * belong to this group (a single stream instance).
 127      *
 128      * You can call ctf_fs_ds_file_create() with one of those paths
 129      * and the trace IR stream below.
 130      */
 131     std::vector<ctf_fs_ds_file_info::UP> ds_file_infos;
 132
 133     /* Owned by this */
 134     struct ctf_stream_class *sc = nullptr;
 135
 136     /* Owned by this */
 137     bt_stream *stream = nullptr;
 138
 139     /* Stream (instance) ID; -1ULL means none */
 140     uint64_t stream_id = 0;
 141
 142     /* Weak, belongs to component */
 143     struct ctf_fs_trace *ctf_fs_trace = nullptr;
 144
 145     /*
 146      * Owned by this.
 147      */
 148     struct ctf_fs_ds_index *index = nullptr;
 149 };
 150
 151 struct ctf_fs_ds_file *ctf_fs_ds_file_create(struct ctf_fs_trace *ctf_fs_trace, bt_stream *stream,
 152                                              const char *path, const bt2c::Logger& logger);
 153
 154 void ctf_fs_ds_file_destroy(struct ctf_fs_ds_file *stream);
 155
 156 struct ctf_fs_ds_index *ctf_fs_ds_file_build_index(struct ctf_fs_ds_file *ds_file,
 157                                                    struct ctf_fs_ds_file_info *ds_file_info,
 158                                                    struct ctf_msg_iter *msg_iter);
 159
 160 struct ctf_fs_ds_index *ctf_fs_ds_index_create(const bt2c::Logger& logger);
 161
 162 void ctf_fs_ds_index_destroy(struct ctf_fs_ds_index *index);
 163
 164 ctf_fs_ds_file_info::UP ctf_fs_ds_file_info_create(const char *path, int64_t begin_ns);
 165
 166 ctf_fs_ds_file_group::UP ctf_fs_ds_file_group_create(struct ctf_fs_trace *ctf_fs_trace,
 167                                                      struct ctf_stream_class *sc,
 168                                                      uint64_t stream_instance_id,
 169                                                      struct ctf_fs_ds_index *index);
 170
 171 /*
 172  * Medium operations to iterate on a single ctf_fs_ds_file.
 173  *
 174  * The data pointer when using this must be a pointer to the ctf_fs_ds_file.
 175  */
 176 extern struct ctf_msg_iter_medium_ops ctf_fs_ds_file_medops;
 177
 178 /*
 179  * Medium operations to iterate on the packet of a ctf_fs_ds_group.
 180  *
 181  * The iteration is done based on the index of the group.
 182  *
 183  * The data pointer when using these medops must be a pointer to a ctf_fs_ds
 184  * group_medops_data structure.
 185  */
 186 extern struct ctf_msg_iter_medium_ops ctf_fs_ds_group_medops;
 187
 188 enum ctf_msg_iter_medium_status ctf_fs_ds_group_medops_data_create(
 189     struct ctf_fs_ds_file_group *ds_file_group, bt_self_message_iterator *self_msg_iter,
 190     const bt2c::Logger& logger, struct ctf_fs_ds_group_medops_data **out);
 191
 192 void ctf_fs_ds_group_medops_data_reset(struct ctf_fs_ds_group_medops_data *data);
 193
 194 void ctf_fs_ds_group_medops_data_destroy(struct ctf_fs_ds_group_medops_data *data);
 195
 196 #endif /* CTF_FS_DS_FILE_H */