content/browser/indexed_db/indexed_db_index_writer.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/indexed_db/indexed_db_index_writer.h"
   6
   7 #include "base/logging.h"
   8 #include "base/strings/utf_string_conversions.h"
   9 #include "content/browser/indexed_db/indexed_db_backing_store.h"
  10 #include "content/browser/indexed_db/indexed_db_tracing.h"
  11 #include "content/browser/indexed_db/indexed_db_transaction.h"
  12 #include "content/common/indexed_db/indexed_db_key.h"
  13 #include "content/common/indexed_db/indexed_db_key_path.h"
  14 #include "content/common/indexed_db/indexed_db_key_range.h"
  15
  16 using base::ASCIIToUTF16;
  17
  18 namespace content {
  19
  20 IndexWriter::IndexWriter(
  21     const IndexedDBIndexMetadata& index_metadata)
  22     : index_metadata_(index_metadata) {}
  23
  24 IndexWriter::IndexWriter(
  25     const IndexedDBIndexMetadata& index_metadata,
  26     const IndexedDBDatabase::IndexKeys& index_keys)
  27     : index_metadata_(index_metadata), index_keys_(index_keys) {}
  28
  29 IndexWriter::~IndexWriter() {}
  30
  31 bool IndexWriter::VerifyIndexKeys(
  32     IndexedDBBackingStore* backing_store,
  33     IndexedDBBackingStore::Transaction* transaction,
  34     int64 database_id,
  35     int64 object_store_id,
  36     int64 index_id,
  37     bool* can_add_keys,
  38     const IndexedDBKey& primary_key,
  39     base::string16* error_message) const {
  40   *can_add_keys = false;
  41   DCHECK_EQ(index_id, index_keys_.first);
  42   for (size_t i = 0; i < index_keys_.second.size(); ++i) {
  43     bool ok = AddingKeyAllowed(backing_store,
  44                                transaction,
  45                                database_id,
  46                                object_store_id,
  47                                index_id,
  48                                (index_keys_.second)[i],
  49                                primary_key,
  50                                can_add_keys);
  51     if (!ok)
  52       return false;
  53     if (!*can_add_keys) {
  54       if (error_message) {
  55         *error_message = ASCIIToUTF16("Unable to add key to index '") +
  56                          index_metadata_.name +
  57                          ASCIIToUTF16("': at least one key does not satisfy "
  58                                       "the uniqueness requirements.");
  59       }
  60       return true;
  61     }
  62   }
  63   *can_add_keys = true;
  64   return true;
  65 }
  66
  67 void IndexWriter::WriteIndexKeys(
  68     const IndexedDBBackingStore::RecordIdentifier& record_identifier,
  69     IndexedDBBackingStore* backing_store,
  70     IndexedDBBackingStore::Transaction* transaction,
  71     int64 database_id,
  72     int64 object_store_id) const {
  73   int64 index_id = index_metadata_.id;
  74   DCHECK_EQ(index_id, index_keys_.first);
  75   for (size_t i = 0; i < index_keys_.second.size(); ++i) {
  76     leveldb::Status s =
  77         backing_store->PutIndexDataForRecord(transaction,
  78                                              database_id,
  79                                              object_store_id,
  80                                              index_id,
  81                                              index_keys_.second[i],
  82                                              record_identifier);
  83     // This should have already been verified as a valid write during
  84     // verify_index_keys.
  85     DCHECK(s.ok());
  86   }
  87 }
  88
  89 bool IndexWriter::AddingKeyAllowed(
  90     IndexedDBBackingStore* backing_store,
  91     IndexedDBBackingStore::Transaction* transaction,
  92     int64 database_id,
  93     int64 object_store_id,
  94     int64 index_id,
  95     const IndexedDBKey& index_key,
  96     const IndexedDBKey& primary_key,
  97     bool* allowed) const {
  98   *allowed = false;
  99   if (!index_metadata_.unique) {
 100     *allowed = true;
 101     return true;
 102   }
 103
 104   scoped_ptr<IndexedDBKey> found_primary_key;
 105   bool found = false;
 106   leveldb::Status s = backing_store->KeyExistsInIndex(transaction,
 107                                                       database_id,
 108                                                       object_store_id,
 109                                                       index_id,
 110                                                       index_key,
 111                                                       &found_primary_key,
 112                                                       &found);
 113   if (!s.ok())
 114     return false;
 115   if (!found ||
 116       (primary_key.IsValid() && found_primary_key->Equals(primary_key)))
 117     *allowed = true;
 118   return true;
 119 }
 120
 121 bool MakeIndexWriters(
 122     IndexedDBTransaction* transaction,
 123     IndexedDBBackingStore* backing_store,
 124     int64 database_id,
 125     const IndexedDBObjectStoreMetadata& object_store,
 126     const IndexedDBKey& primary_key,  // makes a copy
 127     bool key_was_generated,
 128     const std::vector<IndexedDBDatabase::IndexKeys>& index_keys,
 129     ScopedVector<IndexWriter>* index_writers,
 130     base::string16* error_message,
 131     bool* completed) {
 132   *completed = false;
 133
 134   for (const auto& it : index_keys) {
 135     IndexedDBObjectStoreMetadata::IndexMap::const_iterator found =
 136         object_store.indexes.find(it.first);
 137     if (found == object_store.indexes.end())
 138       continue;
 139     const IndexedDBIndexMetadata& index = found->second;
 140     IndexedDBDatabase::IndexKeys keys = it;
 141
 142     // If the object_store is using auto_increment, then any indexes with an
 143     // identical key_path need to also use the primary (generated) key as a key.
 144     if (key_was_generated && (index.key_path == object_store.key_path))
 145       keys.second.push_back(primary_key);
 146
 147     scoped_ptr<IndexWriter> index_writer(new IndexWriter(index, keys));
 148     bool can_add_keys = false;
 149     bool backing_store_success =
 150         index_writer->VerifyIndexKeys(backing_store,
 151                                       transaction->BackingStoreTransaction(),
 152                                       database_id,
 153                                       object_store.id,
 154                                       index.id,
 155                                       &can_add_keys,
 156                                       primary_key,
 157                                       error_message);
 158     if (!backing_store_success)
 159       return false;
 160     if (!can_add_keys)
 161       return true;
 162
 163     index_writers->push_back(index_writer.Pass());
 164   }
 165
 166   *completed = true;
 167   return true;
 168 }
 169
 170 }  // namespace content