1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/indexed_db/blob_reader.h"
#include <limits>
#include <memory>
#include <utility>
#include <vector>
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/strings/utf_string_conversions.h"
#include "base/uuid.h"
#include "content/browser/indexed_db/file_stream_reader_to_data_pipe.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "net/base/net_errors.h"
namespace content::indexed_db {
void BlobReader::Clone(mojo::PendingReceiver<blink::mojom::Blob> receiver) {
receivers_.Add(this, std::move(receiver));
}
void BlobReader::AsDataPipeGetter(
mojo::PendingReceiver<network::mojom::DataPipeGetter> receiver) {
data_pipe_getter_receivers_.Add(this, std::move(receiver));
}
void BlobReader::ReadRange(
uint64_t offset,
uint64_t length,
mojo::ScopedDataPipeProducerHandle handle,
mojo::PendingRemote<blink::mojom::BlobReaderClient> client) {
OpenFileAndReadIntoPipe(file_path_, blob_length_, offset, length,
std::move(handle), std::move(client));
}
void BlobReader::ReadAll(
mojo::ScopedDataPipeProducerHandle handle,
mojo::PendingRemote<blink::mojom::BlobReaderClient> client) {
ReadRange(0, std::numeric_limits<uint64_t>::max(), std::move(handle),
std::move(client));
}
void BlobReader::Load(
mojo::PendingReceiver<network::mojom::URLLoader> loader,
const std::string& method,
const net::HttpRequestHeaders& headers,
mojo::PendingRemote<network::mojom::URLLoaderClient> client) {
// Bounce back to the registry so that we can avoid reimplementing
// `BlobUrlLoader`. This is used for Object URLs. It's not clear how often
// this is used or how important it is to make it super efficient.
registry_blob_->Load(std::move(loader), method, headers, std::move(client));
}
void BlobReader::ReadSideData(
blink::mojom::Blob::ReadSideDataCallback callback) {
std::move(callback).Run(std::nullopt);
}
void BlobReader::CaptureSnapshot(CaptureSnapshotCallback callback) {
// This method is used for the File API. Technically IDB can store Files, but
// when it does so, the size and last modification date should always be known
// and propagated to the renderer through IndexedDBExternalObject's metadata.
// This path is likely only reached when the file modification date and/or
// size is somehow unknown, but reproducing this scenario has proven
// difficult. See crbug.com/390586616
// Note that we don't stat the underlying file because it's just a copy of
// whatever the original File was, and hence would have the wrong modification
// date.
std::move(callback).Run(blob_length_, std::nullopt);
}
void BlobReader::GetInternalUUID(GetInternalUUIDCallback callback) {
std::move(callback).Run(uuid_);
}
void BlobReader::Clone(
mojo::PendingReceiver<network::mojom::DataPipeGetter> receiver) {
data_pipe_getter_receivers_.Add(this, std::move(receiver));
}
void BlobReader::Read(mojo::ScopedDataPipeProducerHandle pipe,
network::mojom::DataPipeGetter::ReadCallback callback) {
std::move(callback).Run(net::OK, blob_length_);
Read(0, std::numeric_limits<uint64_t>::max(), std::move(pipe),
base::DoNothing());
}
void BlobReader::Read(
uint64_t offset,
uint64_t length,
mojo::ScopedDataPipeProducerHandle pipe,
storage::mojom::BlobDataItemReader::ReadCallback callback) {
OpenFileAndReadIntoPipe(file_path_, offset, length, std::move(pipe),
std::move(callback));
}
void BlobReader::ReadSideData(
storage::mojom::BlobDataItemReader::ReadSideDataCallback callback) {
// This type should never have side data.
std::move(callback).Run(net::ERR_NOT_IMPLEMENTED, mojo_base::BigBuffer());
}
BlobReader::BlobReader(const IndexedDBExternalObject& blob_info,
base::OnceClosure on_last_receiver_disconnected)
: uuid_(base::Uuid::GenerateRandomV4().AsLowercaseString()),
blob_length_(blob_info.size()),
content_type_(base::UTF16ToUTF8(blob_info.type())),
file_path_(blob_info.indexed_db_file_path()),
on_last_receiver_disconnected_(std::move(on_last_receiver_disconnected)) {
receivers_.set_disconnect_handler(base::BindRepeating(
&BlobReader::OnMojoDisconnect, base::Unretained(this)));
data_pipe_getter_receivers_.set_disconnect_handler(base::BindRepeating(
&BlobReader::OnMojoDisconnect, base::Unretained(this)));
readers_.set_disconnect_handler(base::BindRepeating(
&BlobReader::OnMojoDisconnect, base::Unretained(this)));
}
BlobReader::~BlobReader() = default;
void BlobReader::BindRegistryBlob(
storage::mojom::BlobStorageContext& blob_registry) {
CHECK(!registry_blob_.is_bound());
auto element = storage::mojom::BlobDataItem::New();
element->size = blob_length_;
element->side_data_size = 0;
element->content_type = content_type_;
element->type = storage::mojom::BlobDataItemType::kIndexedDB;
readers_.Add(this, element->reader.InitWithNewPipeAndPassReceiver());
blob_registry.RegisterFromDataItem(
registry_blob_.BindNewPipeAndPassReceiver(), uuid_, std::move(element));
}
void BlobReader::AddReceiver(
mojo::PendingReceiver<blink::mojom::Blob> receiver,
storage::mojom::BlobStorageContext& blob_registry) {
if (!registry_blob_.is_bound()) {
CHECK(receivers_.empty());
BindRegistryBlob(blob_registry);
}
Clone(std::move(receiver));
}
void BlobReader::OnMojoDisconnect() {
if (!receivers_.empty() || !data_pipe_getter_receivers_.empty()) {
return;
}
// Unregistering the blob will drop its reference to the `BlobDataItem`
// associated with `this` as a `BlobDataItemReader`, which will often lead to
// `readers_` receiving a disconnect. But there may still be other references
// to the `BlobDataItem`, such as another blob, which means that `this` can go
// on living indefinitely. See crbug.com/392376370
registry_blob_.reset();
if (readers_.empty()) {
std::move(on_last_receiver_disconnected_).Run();
// `this` is deleted.
}
}
} // namespace content::indexed_db
|
