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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 "ipc/mojo/ipc_message_pipe_reader.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/message_loop/message_loop_proxy.h"
#include "mojo/public/cpp/environment/environment.h"
namespace IPC {
namespace internal {
MessagePipeReader::MessagePipeReader(mojo::ScopedMessagePipeHandle handle)
: pipe_wait_id_(0),
pipe_(handle.Pass()) {
StartWaiting();
}
MessagePipeReader::~MessagePipeReader() {
CHECK(!IsValid());
}
void MessagePipeReader::Close() {
StopWaiting();
pipe_.reset();
OnPipeClosed();
}
void MessagePipeReader::CloseWithError(MojoResult error) {
OnPipeError(error);
Close();
}
// static
void MessagePipeReader::InvokePipeIsReady(void* closure, MojoResult result) {
reinterpret_cast<MessagePipeReader*>(closure)->PipeIsReady(result);
}
void MessagePipeReader::StartWaiting() {
DCHECK(pipe_.is_valid());
DCHECK(!pipe_wait_id_);
// Not using MOJO_HANDLE_SIGNAL_WRITABLE here, expecting buffer in
// MessagePipe.
//
// TODO(morrita): Should we re-set the signal when we get new
// message to send?
pipe_wait_id_ = mojo::Environment::GetDefaultAsyncWaiter()->AsyncWait(
pipe_.get().value(),
MOJO_HANDLE_SIGNAL_READABLE,
MOJO_DEADLINE_INDEFINITE,
&InvokePipeIsReady,
this);
}
void MessagePipeReader::StopWaiting() {
if (!pipe_wait_id_)
return;
mojo::Environment::GetDefaultAsyncWaiter()->CancelWait(pipe_wait_id_);
pipe_wait_id_ = 0;
}
void MessagePipeReader::PipeIsReady(MojoResult wait_result) {
pipe_wait_id_ = 0;
if (wait_result != MOJO_RESULT_OK) {
if (wait_result != MOJO_RESULT_ABORTED) {
// FAILED_PRECONDITION happens every time the peer is dead so
// it isn't worth polluting the log message.
DLOG_IF(WARNING, wait_result != MOJO_RESULT_FAILED_PRECONDITION)
<< "Pipe got error from the waiter. Closing: "
<< wait_result;
OnPipeError(wait_result);
}
Close();
return;
}
while (pipe_.is_valid()) {
MojoResult read_result = ReadMessageBytes();
if (read_result == MOJO_RESULT_SHOULD_WAIT)
break;
if (read_result != MOJO_RESULT_OK) {
// FAILED_PRECONDITION means that all the received messages
// got consumed and the peer is already closed.
if (read_result != MOJO_RESULT_FAILED_PRECONDITION) {
DLOG(WARNING)
<< "Pipe got error from ReadMessage(). Closing: " << read_result;
OnPipeError(read_result);
}
Close();
break;
}
OnMessageReceived();
}
if (pipe_.is_valid())
StartWaiting();
}
MojoResult MessagePipeReader::ReadMessageBytes() {
DCHECK(handle_buffer_.empty());
uint32_t num_bytes = static_cast<uint32_t>(data_buffer_.size());
uint32_t num_handles = 0;
MojoResult result = MojoReadMessage(pipe_.get().value(),
num_bytes ? &data_buffer_[0] : NULL,
&num_bytes,
NULL,
&num_handles,
MOJO_READ_MESSAGE_FLAG_NONE);
data_buffer_.resize(num_bytes);
handle_buffer_.resize(num_handles);
if (result == MOJO_RESULT_RESOURCE_EXHAUSTED) {
// MOJO_RESULT_RESOURCE_EXHAUSTED was asking the caller that
// it needs more bufer. So we re-read it with resized buffers.
result = MojoReadMessage(pipe_.get().value(),
num_bytes ? &data_buffer_[0] : NULL,
&num_bytes,
num_handles ? &handle_buffer_[0] : NULL,
&num_handles,
MOJO_READ_MESSAGE_FLAG_NONE);
}
DCHECK(0 == num_bytes || data_buffer_.size() == num_bytes);
DCHECK(0 == num_handles || handle_buffer_.size() == num_handles);
return result;
}
void MessagePipeReader::DelayedDeleter::operator()(
MessagePipeReader* ptr) const {
ptr->Close();
base::MessageLoopProxy::current()->PostTask(
FROM_HERE, base::Bind(&DeleteNow, ptr));
}
} // namespace internal
} // namespace IPC
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