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// Copyright (c) 2012 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 "chrome/browser/extensions/api/messaging/native_message_port.h"
#include <utility>
#include "base/bind.h"
#include "base/single_thread_task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "chrome/browser/extensions/api/messaging/native_message_process_host.h"
#include "content/public/browser/browser_thread.h"
namespace extensions {
// Handles jumping between the |host_task_runner| and the
// |message_service_task_runner|.
// All methods on the host interface should be called on |host_task_runner|.
// All methods on |port| (that calls into MessageServices) should be called
// on |message_service_task_runner|.
class NativeMessagePort::Core : public NativeMessageHost::Client {
public:
Core(
scoped_ptr<NativeMessageHost> host,
base::WeakPtr<NativeMessagePort> port,
scoped_refptr<base::SingleThreadTaskRunner> message_service_task_runner_);
~Core() override;
void OnMessageFromChrome(const std::string& message);
// NativeMessageHost::Client implementation.
void PostMessageFromNativeHost(const std::string& message) override;
void CloseChannel(const std::string& error_message) override;
private:
scoped_ptr<NativeMessageHost> host_;
base::WeakPtr<NativeMessagePort> port_;
scoped_refptr<base::SingleThreadTaskRunner> message_service_task_runner_;
scoped_refptr<base::SingleThreadTaskRunner> host_task_runner_;
};
NativeMessagePort::Core::Core(
scoped_ptr<NativeMessageHost> host,
base::WeakPtr<NativeMessagePort> port,
scoped_refptr<base::SingleThreadTaskRunner> message_service_task_runner)
: host_(std::move(host)),
port_(port),
message_service_task_runner_(message_service_task_runner),
host_task_runner_(host_->task_runner()) {
DCHECK(message_service_task_runner_->BelongsToCurrentThread());
host_task_runner_->PostTask(FROM_HERE,
base::Bind(&NativeMessageHost::Start,
base::Unretained(host_.get()),
base::Unretained(this)));
}
NativeMessagePort::Core::~Core() {
DCHECK(host_task_runner_->BelongsToCurrentThread());
}
void NativeMessagePort::Core::OnMessageFromChrome(const std::string& message) {
DCHECK(message_service_task_runner_->BelongsToCurrentThread());
host_task_runner_->PostTask(FROM_HERE,
base::Bind(&NativeMessageHost::OnMessage,
base::Unretained(host_.get()),
message));
}
void NativeMessagePort::Core::PostMessageFromNativeHost(
const std::string& message) {
DCHECK(host_task_runner_->BelongsToCurrentThread());
message_service_task_runner_->PostTask(
FROM_HERE,
base::Bind(
&NativeMessagePort::PostMessageFromNativeHost, port_, message));
}
void NativeMessagePort::Core::CloseChannel(const std::string& error_message) {
DCHECK(host_task_runner_->BelongsToCurrentThread());
message_service_task_runner_->PostTask(
FROM_HERE,
base::Bind(&NativeMessagePort::CloseChannel, port_, error_message));
}
NativeMessagePort::NativeMessagePort(
base::WeakPtr<MessageService> message_service,
int port_id,
scoped_ptr<NativeMessageHost> native_message_host)
: weak_message_service_(message_service),
host_task_runner_(native_message_host->task_runner()),
port_id_(port_id),
weak_factory_(this) {
core_.reset(new Core(std::move(native_message_host),
weak_factory_.GetWeakPtr(),
base::ThreadTaskRunnerHandle::Get()));
}
NativeMessagePort::~NativeMessagePort() {
DCHECK(thread_checker_.CalledOnValidThread());
host_task_runner_->DeleteSoon(FROM_HERE, core_.release());
}
bool NativeMessagePort::IsValidPort() {
// The native message port is immediately connected after construction, so it
// is not possible to invalidate the port between construction and connection.
// The return value doesn't matter since native messaging follows a code path
// where IsValidPort() is never called.
NOTREACHED();
return true;
}
void NativeMessagePort::DispatchOnMessage(const Message& message) {
DCHECK(thread_checker_.CalledOnValidThread());
core_->OnMessageFromChrome(message.data);
}
void NativeMessagePort::PostMessageFromNativeHost(const std::string& message) {
DCHECK(thread_checker_.CalledOnValidThread());
if (weak_message_service_) {
weak_message_service_->PostMessage(
port_id_, Message(message, false /* user_gesture */));
}
}
void NativeMessagePort::CloseChannel(const std::string& error_message) {
DCHECK(thread_checker_.CalledOnValidThread());
if (weak_message_service_) {
weak_message_service_->CloseChannel(port_id_, error_message);
}
}
} // namespace extensions
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