127 lines
3.7 KiB
C++
127 lines
3.7 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
#include "mojo/edk/js/drain_data.h"
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
#include "base/bind.h"
|
|
#include "gin/array_buffer.h"
|
|
#include "gin/converter.h"
|
|
#include "gin/dictionary.h"
|
|
#include "gin/per_context_data.h"
|
|
#include "gin/per_isolate_data.h"
|
|
#include "mojo/public/cpp/system/core.h"
|
|
|
|
namespace mojo {
|
|
namespace edk {
|
|
namespace js {
|
|
|
|
DrainData::DrainData(v8::Isolate* isolate, mojo::Handle handle)
|
|
: isolate_(isolate), handle_(DataPipeConsumerHandle(handle.value())) {
|
|
v8::Handle<v8::Context> context(isolate_->GetCurrentContext());
|
|
runner_ = gin::PerContextData::From(context)->runner()->GetWeakPtr();
|
|
|
|
WaitForData();
|
|
}
|
|
|
|
v8::Handle<v8::Value> DrainData::GetPromise() {
|
|
CHECK(resolver_.IsEmpty());
|
|
v8::Handle<v8::Promise::Resolver> resolver(
|
|
v8::Promise::Resolver::New(isolate_));
|
|
resolver_.Reset(isolate_, resolver);
|
|
return resolver->GetPromise();
|
|
}
|
|
|
|
DrainData::~DrainData() {
|
|
resolver_.Reset();
|
|
}
|
|
|
|
void DrainData::WaitForData() {
|
|
handle_watcher_.Start(
|
|
handle_.get(), MOJO_HANDLE_SIGNAL_READABLE,
|
|
base::Bind(&DrainData::DataReady, base::Unretained(this)));
|
|
}
|
|
|
|
void DrainData::DataReady(MojoResult result) {
|
|
if (result != MOJO_RESULT_OK) {
|
|
DeliverData(result);
|
|
return;
|
|
}
|
|
while (result == MOJO_RESULT_OK) {
|
|
result = ReadData();
|
|
if (result == MOJO_RESULT_SHOULD_WAIT)
|
|
WaitForData();
|
|
else if (result != MOJO_RESULT_OK)
|
|
DeliverData(result);
|
|
}
|
|
}
|
|
|
|
MojoResult DrainData::ReadData() {
|
|
const void* buffer;
|
|
uint32_t num_bytes = 0;
|
|
MojoResult result = BeginReadDataRaw(
|
|
handle_.get(), &buffer, &num_bytes, MOJO_READ_DATA_FLAG_NONE);
|
|
if (result != MOJO_RESULT_OK)
|
|
return result;
|
|
const char* p = static_cast<const char*>(buffer);
|
|
DataBuffer* data_buffer = new DataBuffer(p, p + num_bytes);
|
|
data_buffers_.push_back(data_buffer);
|
|
return EndReadDataRaw(handle_.get(), num_bytes);
|
|
}
|
|
|
|
void DrainData::DeliverData(MojoResult result) {
|
|
if (!runner_) {
|
|
delete this;
|
|
return;
|
|
}
|
|
|
|
size_t total_bytes = 0;
|
|
for (unsigned i = 0; i < data_buffers_.size(); i++)
|
|
total_bytes += data_buffers_[i]->size();
|
|
|
|
// Create a total_bytes length ArrayBuffer return value.
|
|
gin::Runner::Scope scope(runner_.get());
|
|
v8::Handle<v8::ArrayBuffer> array_buffer =
|
|
v8::ArrayBuffer::New(isolate_, total_bytes);
|
|
gin::ArrayBuffer buffer;
|
|
ConvertFromV8(isolate_, array_buffer, &buffer);
|
|
CHECK_EQ(total_bytes, buffer.num_bytes());
|
|
|
|
// Copy the data_buffers into the ArrayBuffer.
|
|
char* array_buffer_ptr = static_cast<char*>(buffer.bytes());
|
|
size_t offset = 0;
|
|
for (size_t i = 0; i < data_buffers_.size(); i++) {
|
|
size_t num_bytes = data_buffers_[i]->size();
|
|
if (num_bytes == 0)
|
|
continue;
|
|
const char* data_buffer_ptr = &((*data_buffers_[i])[0]);
|
|
memcpy(array_buffer_ptr + offset, data_buffer_ptr, num_bytes);
|
|
offset += num_bytes;
|
|
}
|
|
|
|
// The "settled" value of the promise always includes all of the data
|
|
// that was read before either an error occurred or the remote pipe handle
|
|
// was closed. The latter is indicated by MOJO_RESULT_FAILED_PRECONDITION.
|
|
|
|
v8::Handle<v8::Promise::Resolver> resolver(
|
|
v8::Local<v8::Promise::Resolver>::New(isolate_, resolver_));
|
|
|
|
gin::Dictionary dictionary = gin::Dictionary::CreateEmpty(isolate_);
|
|
dictionary.Set("result", result);
|
|
dictionary.Set("buffer", array_buffer);
|
|
v8::Handle<v8::Value> settled_value(ConvertToV8(isolate_, dictionary));
|
|
|
|
if (result == MOJO_RESULT_FAILED_PRECONDITION)
|
|
resolver->Resolve(settled_value);
|
|
else
|
|
resolver->Reject(settled_value);
|
|
|
|
delete this;
|
|
}
|
|
|
|
} // namespace js
|
|
} // namespace edk
|
|
} // namespace mojo
|