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| 1 // Copyright 2014 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 "mojo/bindings/js/drain_data.h" | |
| 6 | |
| 7 #include "gin/array_buffer.h" | |
| 8 #include "gin/converter.h" | |
| 9 #include "gin/dictionary.h" | |
| 10 #include "gin/per_context_data.h" | |
| 11 #include "gin/per_isolate_data.h" | |
| 12 #include "mojo/public/cpp/environment/environment.h" | |
| 13 #include "mojo/public/cpp/system/core.h" | |
| 14 | |
| 15 namespace mojo { | |
| 16 namespace js { | |
| 17 | |
| 18 DrainData::DrainData(v8::Isolate* isolate, mojo::Handle handle) | |
| 19 : isolate_(isolate), | |
| 20 handle_(DataPipeConsumerHandle(handle.value())), | |
| 21 wait_id_(0) { | |
| 22 | |
| 23 v8::Handle<v8::Context> context(isolate_->GetCurrentContext()); | |
| 24 runner_ = gin::PerContextData::From(context)->runner()->GetWeakPtr(); | |
| 25 | |
| 26 WaitForData(); | |
| 27 } | |
| 28 | |
| 29 v8::Handle<v8::Value> DrainData::GetPromise() { | |
| 30 CHECK(resolver_.IsEmpty()); | |
| 31 v8::Handle<v8::Promise::Resolver> resolver( | |
| 32 v8::Promise::Resolver::New(isolate_)); | |
| 33 resolver_.Reset(isolate_, resolver); | |
| 34 return resolver->GetPromise(); | |
| 35 } | |
| 36 | |
| 37 DrainData::~DrainData() { | |
| 38 if (wait_id_) | |
| 39 Environment::GetDefaultAsyncWaiter()->CancelWait(wait_id_); | |
| 40 resolver_.Reset(); | |
| 41 } | |
| 42 | |
| 43 void DrainData::WaitForData() { | |
| 44 wait_id_ = Environment::GetDefaultAsyncWaiter()->AsyncWait( | |
| 45 handle_.get().value(), | |
| 46 MOJO_HANDLE_SIGNAL_READABLE, | |
| 47 MOJO_DEADLINE_INDEFINITE, | |
| 48 &DrainData::WaitCompleted, | |
| 49 this); | |
| 50 } | |
| 51 | |
| 52 void DrainData::DataReady(MojoResult result) { | |
| 53 wait_id_ = 0; | |
| 54 if (result != MOJO_RESULT_OK) { | |
| 55 DeliverData(result); | |
| 56 return; | |
| 57 } | |
| 58 while (result == MOJO_RESULT_OK) { | |
| 59 result = ReadData(); | |
| 60 if (result == MOJO_RESULT_SHOULD_WAIT) | |
| 61 WaitForData(); | |
| 62 else if (result != MOJO_RESULT_OK) | |
| 63 DeliverData(result); | |
| 64 } | |
| 65 } | |
| 66 | |
| 67 MojoResult DrainData::ReadData() { | |
| 68 const void* buffer; | |
| 69 uint32_t num_bytes = 0; | |
| 70 MojoResult result = BeginReadDataRaw( | |
| 71 handle_.get(), &buffer, &num_bytes, MOJO_READ_DATA_FLAG_NONE); | |
| 72 if (result != MOJO_RESULT_OK) | |
| 73 return result; | |
| 74 const char* p = static_cast<const char*>(buffer); | |
| 75 DataBuffer* data_buffer = new DataBuffer(p, p + num_bytes); | |
| 76 data_buffers_.push_back(data_buffer); | |
| 77 return EndReadDataRaw(handle_.get(), num_bytes); | |
| 78 } | |
| 79 | |
| 80 void DrainData::DeliverData(MojoResult result) { | |
| 81 if (!runner_) { | |
| 82 delete this; | |
| 83 return; | |
| 84 } | |
| 85 | |
| 86 size_t total_bytes = 0; | |
| 87 for (unsigned i = 0; i < data_buffers_.size(); i++) | |
| 88 total_bytes += data_buffers_[i]->size(); | |
| 89 | |
| 90 // Create a total_bytes length ArrayBuffer return value. | |
| 91 gin::Runner::Scope scope(runner_.get()); | |
| 92 v8::Handle<v8::ArrayBuffer> array_buffer = | |
| 93 v8::ArrayBuffer::New(isolate_, total_bytes); | |
| 94 gin::ArrayBuffer buffer; | |
| 95 ConvertFromV8(isolate_, array_buffer, &buffer); | |
| 96 CHECK_EQ(total_bytes, buffer.num_bytes()); | |
| 97 | |
| 98 // Copy the data_buffers into the ArrayBuffer. | |
| 99 char* array_buffer_ptr = static_cast<char*>(buffer.bytes()); | |
| 100 size_t offset = 0; | |
| 101 for (size_t i = 0; i < data_buffers_.size(); i++) { | |
| 102 size_t num_bytes = data_buffers_[i]->size(); | |
| 103 if (num_bytes == 0) | |
| 104 continue; | |
| 105 const char* data_buffer_ptr = &((*data_buffers_[i])[0]); | |
| 106 memcpy(array_buffer_ptr + offset, data_buffer_ptr, num_bytes); | |
| 107 offset += num_bytes; | |
| 108 } | |
| 109 | |
| 110 // The "settled" value of the promise always includes all of the data | |
| 111 // that was read before either an error occurred or the remote pipe handle | |
| 112 // was closed. The latter is indicated by MOJO_RESULT_FAILED_PRECONDITION. | |
| 113 | |
| 114 v8::Handle<v8::Promise::Resolver> resolver( | |
| 115 v8::Local<v8::Promise::Resolver>::New(isolate_, resolver_)); | |
| 116 | |
| 117 gin::Dictionary dictionary = gin::Dictionary::CreateEmpty(isolate_); | |
| 118 dictionary.Set("result", result); | |
| 119 dictionary.Set("buffer", array_buffer); | |
| 120 v8::Handle<v8::Value> settled_value(ConvertToV8(isolate_, dictionary)); | |
| 121 | |
| 122 if (result == MOJO_RESULT_FAILED_PRECONDITION) | |
| 123 resolver->Resolve(settled_value); | |
| 124 else | |
| 125 resolver->Reject(settled_value); | |
| 126 | |
| 127 delete this; | |
| 128 } | |
| 129 | |
| 130 } // namespace js | |
| 131 } // namespace mojo | |
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Chromium Code Reviews
Issue 703273002:
Update mojo sdk to rev 04a510fb37db10642e156957f9b2c11c2f6442ac (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master