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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 <stdint.h>
#include <utility>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/single_thread_task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "ipc/mojo/ipc_channel_mojo.h"
#include "mojo/public/cpp/bindings/message.h"
namespace IPC {
namespace internal {
namespace {
// Used by Send() to capture a serialized Channel::Receive message.
class MessageSerializer : public mojo::MessageReceiverWithResponder {
public:
MessageSerializer() {}
~MessageSerializer() override {}
mojo::Message* message() { return &message_; }
private:
// mojo::MessageReceiverWithResponder
bool Accept(mojo::Message* message) override {
message->MoveTo(&message_);
return true;
}
bool AcceptWithResponder(mojo::Message* message,
mojo::MessageReceiver* responder) override {
NOTREACHED();
return false;
}
mojo::Message message_;
DISALLOW_COPY_AND_ASSIGN(MessageSerializer);
};
} // namespace
MessagePipeReader::MessagePipeReader(
mojo::MessagePipeHandle pipe,
mojom::ChannelAssociatedPtr sender,
mojo::AssociatedInterfaceRequest<mojom::Channel> receiver,
base::ProcessId peer_pid,
MessagePipeReader::Delegate* delegate)
: delegate_(delegate),
peer_pid_(peer_pid),
sender_(std::move(sender)),
binding_(this, std::move(receiver)),
sender_interface_id_(sender_.interface_id()),
sender_pipe_(pipe) {
sender_.set_connection_error_handler(
base::Bind(&MessagePipeReader::OnPipeError, base::Unretained(this),
MOJO_RESULT_FAILED_PRECONDITION));
binding_.set_connection_error_handler(
base::Bind(&MessagePipeReader::OnPipeError, base::Unretained(this),
MOJO_RESULT_FAILED_PRECONDITION));
}
MessagePipeReader::~MessagePipeReader() {
DCHECK(thread_checker_.CalledOnValidThread());
// The pipe should be closed before deletion.
}
void MessagePipeReader::Close() {
DCHECK(thread_checker_.CalledOnValidThread());
sender_.reset();
if (binding_.is_bound())
binding_.Close();
}
bool MessagePipeReader::Send(scoped_ptr<Message> message) {
TRACE_EVENT_WITH_FLOW0(TRACE_DISABLED_BY_DEFAULT("ipc.flow"),
"MessagePipeReader::Send",
message->flags(),
TRACE_EVENT_FLAG_FLOW_OUT);
mojo::Array<mojom::SerializedHandlePtr> handles(nullptr);
MojoResult result = MOJO_RESULT_OK;
result = ChannelMojo::ReadFromMessageAttachmentSet(message.get(), &handles);
if (result != MOJO_RESULT_OK)
return false;
mojo::Array<uint8_t> data(message->size());
std::copy(reinterpret_cast<const uint8_t*>(message->data()),
reinterpret_cast<const uint8_t*>(message->data()) + message->size(),
&data[0]);
MessageSerializer serializer;
mojom::ChannelProxy proxy(&serializer);
proxy.Receive(std::move(data), std::move(handles));
mojo::Message* mojo_message = serializer.message();
size_t num_handles = mojo_message->handles()->size();
DCHECK_LE(num_handles, std::numeric_limits<uint32_t>::max());
mojo_message->set_interface_id(sender_interface_id_);
result = mojo::WriteMessageRaw(
sender_pipe_, mojo_message->data(), mojo_message->data_num_bytes(),
reinterpret_cast<const MojoHandle*>(mojo_message->handles()->data()),
static_cast<uint32_t>(num_handles), MOJO_WRITE_MESSAGE_FLAG_NONE);
// If the write was successful, the handles have been transferred and they
// should not be closed when the message is destroyed.
if (result == MOJO_RESULT_OK)
mojo_message->mutable_handles()->clear();
DVLOG(4) << "Send " << message->type() << ": " << message->size();
return result == MOJO_RESULT_OK;
}
void MessagePipeReader::Receive(
mojo::Array<uint8_t> data,
mojo::Array<mojom::SerializedHandlePtr> handles) {
Message message(
data.size() == 0 ? "" : reinterpret_cast<const char*>(&data[0]),
static_cast<uint32_t>(data.size()));
message.set_sender_pid(peer_pid_);
DVLOG(4) << "Receive " << message.type() << ": " << message.size();
MojoResult write_result =
ChannelMojo::WriteToMessageAttachmentSet(std::move(handles), &message);
if (write_result != MOJO_RESULT_OK) {
OnPipeError(write_result);
return;
}
TRACE_EVENT_WITH_FLOW0(TRACE_DISABLED_BY_DEFAULT("ipc.flow"),
"MessagePipeReader::Receive",
message.flags(),
TRACE_EVENT_FLAG_FLOW_IN);
delegate_->OnMessageReceived(message);
}
void MessagePipeReader::OnPipeError(MojoResult error) {
DCHECK(thread_checker_.CalledOnValidThread());
if (delegate_)
delegate_->OnPipeError();
Close();
}
void MessagePipeReader::DelayedDeleter::operator()(
MessagePipeReader* ptr) const {
ptr->Close();
base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
base::Bind(&DeleteNow, ptr));
}
} // namespace internal
} // namespace IPC
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