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| 1 // Copyright 2015 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 "config.h" | |
| 6 #include "modules/fetch/ReadableStreamDataConsumerHandle.h" | |
| 7 | |
| 8 #include "bindings/core/v8/ExceptionState.h" | |
| 9 #include "bindings/core/v8/ReadableStreamOperations.h" | |
| 10 #include "bindings/core/v8/ScriptFunction.h" | |
| 11 #include "bindings/core/v8/ScriptState.h" | |
| 12 #include "bindings/core/v8/ScriptValue.h" | |
| 13 #include "bindings/core/v8/V8BindingMacros.h" | |
| 14 #include "bindings/core/v8/V8IteratorResultValue.h" | |
| 15 #include "bindings/core/v8/V8RecursionScope.h" | |
| 16 #include "bindings/core/v8/V8Uint8Array.h" | |
| 17 #include "core/dom/DOMTypedArray.h" | |
| 18 #include "public/platform/Platform.h" | |
| 19 #include "public/platform/WebTaskRunner.h" | |
| 20 #include "public/platform/WebThread.h" | |
| 21 #include "public/platform/WebTraceLocation.h" | |
| 22 #include "wtf/Assertions.h" | |
| 23 #include "wtf/Functional.h" | |
| 24 #include "wtf/RefCounted.h" | |
| 25 #include <algorithm> | |
| 26 #include <string.h> | |
| 27 #include <v8.h> | |
| 28 | |
| 29 namespace blink { | |
| 30 | |
| 31 using Result = WebDataConsumerHandle::Result; | |
| 32 using Flags = WebDataConsumerHandle::Flags; | |
| 33 | |
| 34 // This context is not yet thread-safe. | |
| 35 class ReadableStreamDataConsumerHandle::ReadingContext final : public RefCounted
<ReadingContext> { | |
| 36 WTF_MAKE_NONCOPYABLE(ReadingContext); | |
| 37 public: | |
| 38 class OnFulfilled final : public ScriptFunction { | |
| 39 public: | |
| 40 static v8::Local<v8::Function> createFunction(ScriptState* scriptState,
PassRefPtr<ReadingContext> context) | |
| 41 { | |
| 42 return (new OnFulfilled(scriptState, context))->bindToV8Function(); | |
| 43 } | |
| 44 | |
| 45 ScriptValue call(ScriptValue v) override | |
| 46 { | |
| 47 bool done; | |
| 48 v8::Local<v8::Value> item = v.v8Value(); | |
| 49 ASSERT(item->IsObject()); | |
| 50 v8::Local<v8::Value> value = v8CallOrCrash(v8UnpackIteratorResult(v.
scriptState(), item.As<v8::Object>(), &done)); | |
| 51 if (done) { | |
| 52 m_readingContext->onReadDone(); | |
| 53 return v; | |
| 54 } | |
| 55 if (!V8Uint8Array::hasInstance(value, v.isolate())) { | |
| 56 m_readingContext->onRejected(); | |
| 57 return ScriptValue(); | |
| 58 } | |
| 59 m_readingContext->onRead(V8Uint8Array::toImpl(value.As<v8::Object>()
)); | |
| 60 return v; | |
| 61 } | |
| 62 | |
| 63 private: | |
| 64 OnFulfilled(ScriptState* scriptState, PassRefPtr<ReadingContext> context
) | |
| 65 : ScriptFunction(scriptState), m_readingContext(context) {} | |
| 66 | |
| 67 RefPtr<ReadingContext> m_readingContext; | |
| 68 }; | |
| 69 | |
| 70 class OnRejected final : public ScriptFunction { | |
| 71 public: | |
| 72 static v8::Local<v8::Function> createFunction(ScriptState* scriptState,
PassRefPtr<ReadingContext> context) | |
| 73 { | |
| 74 return (new OnRejected(scriptState, context))->bindToV8Function(); | |
| 75 } | |
| 76 | |
| 77 ScriptValue call(ScriptValue v) override | |
| 78 { | |
| 79 m_readingContext->onRejected(); | |
| 80 return v; | |
| 81 } | |
| 82 | |
| 83 private: | |
| 84 OnRejected(ScriptState* scriptState, PassRefPtr<ReadingContext> context) | |
| 85 : ScriptFunction(scriptState), m_readingContext(context) {} | |
| 86 | |
| 87 RefPtr<ReadingContext> m_readingContext; | |
| 88 }; | |
| 89 | |
| 90 class ReaderImpl final : public FetchDataConsumerHandle::Reader { | |
| 91 public: | |
| 92 ReaderImpl(PassRefPtr<ReadingContext> context, Client* client) | |
| 93 : m_readingContext(context) | |
| 94 { | |
| 95 m_readingContext->attachReader(client); | |
| 96 } | |
| 97 ~ReaderImpl() override | |
| 98 { | |
| 99 m_readingContext->detachReader(); | |
| 100 } | |
| 101 | |
| 102 Result read(void* buffer, size_t size, Flags flags, size_t* readSize) ov
erride | |
| 103 { | |
| 104 *readSize = 0; | |
| 105 const void* src = nullptr; | |
| 106 size_t available; | |
| 107 Result r = beginRead(&src, flags, &available); | |
| 108 if (r != WebDataConsumerHandle::Ok) | |
| 109 return r; | |
| 110 *readSize = std::min(available, size); | |
| 111 memcpy(buffer, src, *readSize); | |
| 112 return endRead(*readSize); | |
| 113 } | |
| 114 | |
| 115 Result beginRead(const void** buffer, Flags, size_t* available) override | |
| 116 { | |
| 117 return m_readingContext->beginRead(buffer, available); | |
| 118 } | |
| 119 | |
| 120 Result endRead(size_t readSize) override | |
| 121 { | |
| 122 return m_readingContext->endRead(readSize); | |
| 123 } | |
| 124 | |
| 125 private: | |
| 126 RefPtr<ReadingContext> m_readingContext; | |
| 127 }; | |
| 128 | |
| 129 static PassRefPtr<ReadingContext> create(ScriptState* scriptState, v8::Local
<v8::Value> stream) | |
| 130 { | |
| 131 return adoptRef(new ReadingContext(scriptState, stream)); | |
| 132 } | |
| 133 | |
| 134 void attachReader(WebDataConsumerHandle::Client* client) | |
| 135 { | |
| 136 m_client = client; | |
| 137 notifyLater(); | |
| 138 } | |
| 139 | |
| 140 void detachReader() | |
| 141 { | |
| 142 m_client = nullptr; | |
| 143 } | |
| 144 | |
| 145 Result beginRead(const void** buffer, size_t* available) | |
| 146 { | |
| 147 *buffer = nullptr; | |
| 148 *available = 0; | |
| 149 if (m_hasError) | |
| 150 return WebDataConsumerHandle::UnexpectedError; | |
| 151 if (m_isDone) | |
| 152 return WebDataConsumerHandle::Done; | |
| 153 | |
| 154 if (m_pendingBuffer) { | |
| 155 ASSERT(m_pendingOffset < m_pendingBuffer->length()); | |
| 156 *buffer = m_pendingBuffer->data() + m_pendingOffset; | |
| 157 *available = m_pendingBuffer->length() - m_pendingOffset; | |
| 158 return WebDataConsumerHandle::Ok; | |
| 159 } | |
| 160 ASSERT(!m_reader.isEmpty()); | |
| 161 m_isInRecursion = true; | |
| 162 if (!m_isReading) { | |
| 163 m_isReading = true; | |
| 164 ScriptState::Scope scope(m_reader.scriptState()); | |
| 165 V8RecursionScope recursionScope(m_reader.isolate()); | |
| 166 ReadableStreamOperations::read(m_reader.scriptState(), m_reader.v8Va
lue()).then( | |
| 167 OnFulfilled::createFunction(m_reader.scriptState(), this), | |
| 168 OnRejected::createFunction(m_reader.scriptState(), this)); | |
| 169 // Note: Microtasks may run here. | |
| 170 } | |
| 171 m_isInRecursion = false; | |
| 172 return WebDataConsumerHandle::ShouldWait; | |
| 173 } | |
| 174 | |
| 175 Result endRead(size_t readSize) | |
| 176 { | |
| 177 ASSERT(m_pendingBuffer); | |
| 178 ASSERT(m_pendingOffset + readSize <= m_pendingBuffer->length()); | |
| 179 m_pendingOffset += readSize; | |
| 180 if (m_pendingOffset == m_pendingBuffer->length()) { | |
| 181 m_pendingBuffer = nullptr; | |
| 182 m_pendingOffset = 0; | |
| 183 } | |
| 184 return WebDataConsumerHandle::Ok; | |
| 185 } | |
| 186 | |
| 187 void onRead(DOMUint8Array* buffer) | |
| 188 { | |
| 189 ASSERT(m_isReading); | |
| 190 ASSERT(buffer); | |
| 191 ASSERT(!m_pendingBuffer); | |
| 192 ASSERT(!m_pendingOffset); | |
| 193 m_isReading = false; | |
| 194 m_pendingBuffer = buffer; | |
| 195 notify(); | |
| 196 } | |
| 197 | |
| 198 void onReadDone() | |
| 199 { | |
| 200 ASSERT(m_isReading); | |
| 201 ASSERT(!m_pendingBuffer); | |
| 202 m_isReading = false; | |
| 203 m_isDone = true; | |
| 204 m_reader.clear(); | |
| 205 notify(); | |
| 206 } | |
| 207 | |
| 208 void onRejected() | |
| 209 { | |
| 210 ASSERT(m_isReading); | |
| 211 ASSERT(!m_pendingBuffer); | |
| 212 m_hasError = true; | |
| 213 m_isReading = false; | |
| 214 m_reader.clear(); | |
| 215 notify(); | |
| 216 } | |
| 217 | |
| 218 void notify() | |
| 219 { | |
| 220 if (!m_client) | |
| 221 return; | |
| 222 if (m_isInRecursion) { | |
| 223 notifyLater(); | |
| 224 return; | |
| 225 } | |
| 226 m_client->didGetReadable(); | |
| 227 } | |
| 228 | |
| 229 void notifyLater() | |
| 230 { | |
| 231 ASSERT(m_client); | |
| 232 Platform::current()->currentThread()->taskRunner()->postTask(BLINK_FROM_
HERE, bind(&ReadingContext::notify, this)); | |
| 233 } | |
| 234 | |
| 235 private: | |
| 236 ReadingContext(ScriptState* scriptState, v8::Local<v8::Value> stream) | |
| 237 : m_client(nullptr) | |
| 238 , m_pendingOffset(0) | |
| 239 , m_isReading(false) | |
| 240 , m_isDone(false) | |
| 241 , m_hasError(false) | |
| 242 , m_isInRecursion(false) | |
| 243 { | |
| 244 if (!ReadableStreamOperations::isLocked(scriptState, stream)) { | |
| 245 // Here the stream implementation must not throw an exception. | |
| 246 NonThrowableExceptionState es; | |
| 247 m_reader = ReadableStreamOperations::getReader(scriptState, stream,
es); | |
| 248 } | |
| 249 m_hasError = m_reader.isEmpty(); | |
| 250 } | |
| 251 | |
| 252 // This ScriptValue is leaky because it stores a strong reference to a | |
| 253 // JavaScript object. | |
| 254 // TODO(yhirano): Fix it. | |
| 255 // | |
| 256 // Holding a ScriptValue here is safe in terms of cross-world wrapper | |
| 257 // leakage because we read only Uint8Array chunks from the reader. | |
| 258 ScriptValue m_reader; | |
| 259 WebDataConsumerHandle::Client* m_client; | |
| 260 RefPtr<DOMUint8Array> m_pendingBuffer; | |
| 261 size_t m_pendingOffset; | |
| 262 bool m_isReading; | |
| 263 bool m_isDone; | |
| 264 bool m_hasError; | |
| 265 bool m_isInRecursion; | |
| 266 }; | |
| 267 | |
| 268 ReadableStreamDataConsumerHandle::ReadableStreamDataConsumerHandle(ScriptState*
scriptState, v8::Local<v8::Value> stream) | |
| 269 : m_readingContext(ReadingContext::create(scriptState, stream)) | |
| 270 { | |
| 271 } | |
| 272 ReadableStreamDataConsumerHandle::~ReadableStreamDataConsumerHandle() = default; | |
| 273 | |
| 274 FetchDataConsumerHandle::Reader* ReadableStreamDataConsumerHandle::obtainReaderI
nternal(Client* client) | |
| 275 { | |
| 276 return new ReadingContext::ReaderImpl(m_readingContext, client); | |
| 277 } | |
| 278 | |
| 279 } // namespace blink | |
| 280 | |
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Chromium Code Reviews
Issue 1527493002:
Revert of Response construction with a ReadableStream (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master