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/public/cpp/system/data_pipe_drainer.h"
6
7 #include <stdint.h>
8
9 #include <utility>
10
11 #include "base/bind.h"
12
13 namespace mojo {
14
DataPipeDrainer(Client * client,mojo::ScopedDataPipeConsumerHandle source)15 DataPipeDrainer::DataPipeDrainer(Client* client,
16 mojo::ScopedDataPipeConsumerHandle source)
17 : client_(client),
18 source_(std::move(source)),
19 handle_watcher_(FROM_HERE,
20 SimpleWatcher::ArmingPolicy::AUTOMATIC,
21 base::SequencedTaskRunnerHandle::Get()),
22 weak_factory_(this) {
23 DCHECK(client_);
24 handle_watcher_.Watch(
25 source_.get(), MOJO_HANDLE_SIGNAL_READABLE,
26 base::Bind(&DataPipeDrainer::WaitComplete, weak_factory_.GetWeakPtr()));
27 }
28
~DataPipeDrainer()29 DataPipeDrainer::~DataPipeDrainer() {}
30
ReadData()31 void DataPipeDrainer::ReadData() {
32 const void* buffer = nullptr;
33 uint32_t num_bytes = 0;
34 MojoResult rv =
35 source_->BeginReadData(&buffer, &num_bytes, MOJO_READ_DATA_FLAG_NONE);
36 if (rv == MOJO_RESULT_OK) {
37 client_->OnDataAvailable(buffer, num_bytes);
38 source_->EndReadData(num_bytes);
39 } else if (rv == MOJO_RESULT_FAILED_PRECONDITION) {
40 client_->OnDataComplete();
41 } else if (rv != MOJO_RESULT_SHOULD_WAIT) {
42 DCHECK(false) << "Unhandled MojoResult: " << rv;
43 }
44 }
45
WaitComplete(MojoResult result)46 void DataPipeDrainer::WaitComplete(MojoResult result) {
47 ReadData();
48 }
49
50 } // namespace mojo
51