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// Copyright 2016 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/shell/background/background_shell.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/synchronization/waitable_event.h"
#include "base/threading/simple_thread.h"
#include "mojo/message_pump/message_pump_mojo.h"
#include "mojo/shell/application_loader.h"
#include "mojo/shell/application_manager.h"
#include "mojo/shell/capability_filter.h"
#include "mojo/shell/connect_to_application_params.h"
#include "mojo/shell/public/cpp/shell_client.h"
#include "mojo/shell/public/cpp/shell_connection.h"
#include "mojo/shell/standalone/context.h"
#include "url/gurl.h"
namespace mojo {
namespace shell {
namespace {
scoped_ptr<base::MessagePump> CreateMessagePumpMojo() {
return make_scoped_ptr(new common::MessagePumpMojo);
}
// Used to obtain the InterfaceRequest for an application.
class BackgroundApplicationLoader : public ApplicationLoader {
public:
BackgroundApplicationLoader() {}
~BackgroundApplicationLoader() override {}
bool got_request() const { return got_request_; }
InterfaceRequest<mojom::ShellClient> TakeApplicationRequest() {
return std::move(request_);
}
// ApplicationLoader:
void Load(const GURL& url,
InterfaceRequest<mojom::ShellClient> request) override {
got_request_ = true;
request_ = std::move(request);
}
private:
bool got_request_ = false;
InterfaceRequest<mojom::ShellClient> request_;
DISALLOW_COPY_AND_ASSIGN(BackgroundApplicationLoader);
};
class MojoMessageLoop : public base::MessageLoop {
public:
MojoMessageLoop()
: base::MessageLoop(base::MessageLoop::TYPE_CUSTOM,
base::Bind(&CreateMessagePumpMojo)) {}
~MojoMessageLoop() override {}
void BindToCurrentThread() { base::MessageLoop::BindToCurrentThread(); }
private:
DISALLOW_COPY_AND_ASSIGN(MojoMessageLoop);
};
} // namespace
// Manages the thread to startup mojo.
class BackgroundShell::MojoThread : public base::SimpleThread {
public:
MojoThread() : SimpleThread("mojo-background-shell") {}
~MojoThread() override {}
void CreateShellClientRequest(base::WaitableEvent* signal,
scoped_ptr<ConnectToApplicationParams> params,
InterfaceRequest<mojom::ShellClient>* request) {
// Only valid to call this on the background thread.
DCHECK_EQ(message_loop_, base::MessageLoop::current());
// Ownership of |loader| passes to ApplicationManager.
BackgroundApplicationLoader* loader = new BackgroundApplicationLoader;
const GURL url = params->target().url();
context_->application_manager()->SetLoaderForURL(make_scoped_ptr(loader),
url);
context_->application_manager()->ConnectToApplication(std::move(params));
DCHECK(loader->got_request());
*request = loader->TakeApplicationRequest();
// Trigger destruction of the loader.
context_->application_manager()->SetLoaderForURL(nullptr, url);
signal->Signal();
}
base::MessageLoop* message_loop() { return message_loop_; }
// Stops the background thread.
void Stop() {
DCHECK_NE(message_loop_, base::MessageLoop::current());
message_loop_->task_runner()->PostTask(
FROM_HERE, base::MessageLoop::QuitWhenIdleClosure());
Join();
}
// base::SimpleThread:
void Start() override {
DCHECK(!message_loop_);
message_loop_ = new MojoMessageLoop;
base::SimpleThread::Start();
}
void Run() override {
// The construction/destruction order is very finicky and has to be done
// in the order here.
scoped_ptr<base::MessageLoop> message_loop(message_loop_);
Context::EnsureEmbedderIsInitialized();
message_loop_->BindToCurrentThread();
base::FilePath shell_dir;
PathService::Get(base::DIR_MODULE, &shell_dir);
scoped_ptr<Context> context(new Context);
context_ = context.get();
context_->Init(shell_dir);
message_loop_->Run();
// Has to happen after run, but while messageloop still valid.
context_->Shutdown();
// Context has to be destroyed after the MessageLoop has been destroyed.
message_loop.reset();
context_ = nullptr;
}
private:
// We own this. It's created on the main thread, but destroyed on the
// background thread.
MojoMessageLoop* message_loop_ = nullptr;
// Created in Run() on the background thread.
Context* context_ = nullptr;
DISALLOW_COPY_AND_ASSIGN(MojoThread);
};
BackgroundShell::BackgroundShell() {}
BackgroundShell::~BackgroundShell() {
thread_->Stop();
}
void BackgroundShell::Init() {
DCHECK(!thread_);
thread_.reset(new MojoThread);
thread_->Start();
}
InterfaceRequest<mojom::ShellClient> BackgroundShell::CreateShellClientRequest(
const GURL& url) {
scoped_ptr<ConnectToApplicationParams> params(new ConnectToApplicationParams);
params->SetTarget(
Identity(url, std::string(), GetPermissiveCapabilityFilter()));
InterfaceRequest<mojom::ShellClient> request;
base::WaitableEvent signal(true, false);
thread_->message_loop()->task_runner()->PostTask(
FROM_HERE, base::Bind(&MojoThread::CreateShellClientRequest,
base::Unretained(thread_.get()), &signal,
base::Passed(¶ms), &request));
signal.Wait();
return request;
}
} // namespace shell
} // namespace mojo
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