plugins/ctf/fs/metadata.c

   1 /*
   2  * Copyright 2016 - Philippe Proulx <pproulx@efficios.com>
   3  * Copyright 2010-2011 - EfficiOS Inc. and Linux Foundation
   4  *
   5  * Some functions are based on older functions written by Mathieu Desnoyers.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  */
  25
  26 #include <stdio.h>
  27 #include <stdint.h>
  28 #include <stdlib.h>
  29 #include <stdbool.h>
  30 #include <assert.h>
  31 #include <glib.h>
  32 #include <babeltrace/compat/uuid.h>
  33 #include <babeltrace/compat/memstream.h>
  34
  35 #define PRINT_ERR_STREAM        ctf_fs->error_fp
  36 #define PRINT_PREFIX            "ctf-fs-metadata"
  37 #include "print.h"
  38
  39 #include "fs.h"
  40 #include "file.h"
  41 #include "metadata.h"
  42 #include "../common/metadata/decoder.h"
  43
  44 #define NSEC_PER_SEC 1000000000LL
  45
  46 BT_HIDDEN
  47 FILE *ctf_fs_metadata_open_file(const char *trace_path)
  48 {
  49         GString *metadata_path = g_string_new(trace_path);
  50         FILE *fp = NULL;
  51
  52         if (!metadata_path) {
  53                 goto error;
  54         }
  55
  56         g_string_append(metadata_path, "/" CTF_FS_METADATA_FILENAME);
  57         fp = fopen(metadata_path->str, "rb");
  58         if (!fp) {
  59                 goto error;
  60         }
  61
  62         goto end;
  63
  64 error:
  65         if (fp) {
  66                 fclose(fp);
  67                 fp = NULL;
  68         }
  69
  70 end:
  71         g_string_free(metadata_path, TRUE);
  72         return fp;
  73 }
  74
  75 static struct ctf_fs_file *get_file(struct ctf_fs_component *ctf_fs,
  76                 const char *trace_path)
  77 {
  78         struct ctf_fs_file *file = ctf_fs_file_create(ctf_fs);
  79
  80         if (!file) {
  81                 goto error;
  82         }
  83
  84         g_string_append(file->path, trace_path);
  85         g_string_append(file->path, "/" CTF_FS_METADATA_FILENAME);
  86
  87         if (ctf_fs_file_open(ctf_fs, file, "rb")) {
  88                 goto error;
  89         }
  90
  91         goto end;
  92
  93 error:
  94         if (file) {
  95                 ctf_fs_file_destroy(file);
  96                 file = NULL;
  97         }
  98
  99 end:
 100         return file;
 101 }
 102
 103 int ctf_fs_metadata_set_trace(struct ctf_fs_component *ctf_fs)
 104 {
 105         int ret = 0;
 106         struct ctf_fs_file *file = NULL;
 107         struct ctf_metadata_decoder *metadata_decoder = NULL;
 108
 109         file = get_file(ctf_fs, ctf_fs->trace_path->str);
 110         if (!file) {
 111                 PERR("Cannot create metadata file object\n");
 112                 goto end;
 113         }
 114
 115         metadata_decoder = ctf_metadata_decoder_create(ctf_fs->error_fp,
 116                 ctf_fs->options.clock_offset * NSEC_PER_SEC +
 117                 ctf_fs->options.clock_offset_ns);
 118         if (!metadata_decoder) {
 119                 PERR("Cannot create metadata decoder object\n");
 120                 goto end;
 121         }
 122
 123         ret = ctf_metadata_decoder_decode(metadata_decoder, file->fp);
 124         if (ret) {
 125                 PERR("Cannot decode metadata file\n");
 126                 goto end;
 127         }
 128
 129         ctf_fs->metadata->trace = ctf_metadata_decoder_get_trace(
 130                 metadata_decoder);
 131         assert(ctf_fs->metadata->trace);
 132         ret = -1;
 133
 134 end:
 135         ctf_fs_file_destroy(file);
 136         ctf_metadata_decoder_destroy(metadata_decoder);
 137         return ret;
 138 }
 139
 140 int ctf_fs_metadata_init(struct ctf_fs_metadata *metadata)
 141 {
 142         /* Nothing to initialize for the moment. */
 143         return 0;
 144 }
 145
 146 void ctf_fs_metadata_fini(struct ctf_fs_metadata *metadata)
 147 {
 148         if (metadata->text) {
 149                 free(metadata->text);
 150         }
 151
 152         if (metadata->trace) {
 153                 BT_PUT(metadata->trace);
 154         }
 155 }