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// 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, MOJO_DEADLINE_INDEFINITE,
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
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