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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/services/package_manager/package_manager.h"
#include "mojo/shell/application_loader.h"
#include "mojo/shell/application_manager.h"
#include "mojo/shell/capability_filter.h"
#include "mojo/shell/connect_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 ShellClientRequest for an application. When
// ApplicationLoader::Load() is called a callback is run with the
// ShellClientRequest.
class BackgroundApplicationLoader : public ApplicationLoader {
public:
using Callback = base::Callback<void(mojom::ShellClientRequest)>;
explicit BackgroundApplicationLoader(const Callback& callback)
: callback_(callback) {}
~BackgroundApplicationLoader() override {}
// ApplicationLoader:
void Load(const GURL& url, mojom::ShellClientRequest request) override {
DCHECK(!callback_.is_null()); // Callback should only be run once.
Callback callback = callback_;
callback_.Reset();
callback.Run(std::move(request));
}
private:
Callback callback_;
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:
explicit MojoThread(scoped_ptr<BackgroundShell::InitParams> init_params)
: SimpleThread("mojo-background-shell"),
init_params_(std::move(init_params)) {}
~MojoThread() override {}
void CreateShellClientRequest(base::WaitableEvent* signal,
scoped_ptr<ConnectParams> params,
mojom::ShellClientRequest* request) {
// Only valid to call this on the background thread.
DCHECK_EQ(message_loop_, base::MessageLoop::current());
// Ownership of |loader| passes to ApplicationManager.
const GURL url = params->target().url();
BackgroundApplicationLoader* loader = new BackgroundApplicationLoader(
base::Bind(&MojoThread::OnGotApplicationRequest, base::Unretained(this),
url, signal, request));
context_->application_manager()->SetLoaderForURL(make_scoped_ptr(loader),
url);
context_->application_manager()->Connect(std::move(params));
// The request is asynchronously processed. When processed
// OnGotApplicationRequest() is called and we'll 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();
scoped_ptr<Context> context(new Context);
context_ = context.get();
scoped_ptr<mojo::shell::Context::InitParams> context_init_params(
new mojo::shell::Context::InitParams);
context_init_params->app_catalog = std::move(init_params_->app_catalog);
context_init_params->native_runner_delegate =
init_params_->native_runner_delegate;
context_->Init(std::move(context_init_params));
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:
void OnGotApplicationRequest(const GURL& url,
base::WaitableEvent* signal,
mojom::ShellClientRequest* request_result,
mojom::ShellClientRequest actual_request) {
*request_result = std::move(actual_request);
// Trigger destruction of the loader.
context_->application_manager()->SetLoaderForURL(nullptr, url);
signal->Signal();
}
// 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;
scoped_ptr<BackgroundShell::InitParams> init_params_;
DISALLOW_COPY_AND_ASSIGN(MojoThread);
};
BackgroundShell::InitParams::InitParams() {}
BackgroundShell::InitParams::~InitParams() {}
BackgroundShell::BackgroundShell() {}
BackgroundShell::~BackgroundShell() {
thread_->Stop();
}
void BackgroundShell::Init(scoped_ptr<InitParams> init_params) {
DCHECK(!thread_);
thread_.reset(new MojoThread(std::move(init_params)));
thread_->Start();
}
mojom::ShellClientRequest BackgroundShell::CreateShellClientRequest(
const GURL& url) {
scoped_ptr<ConnectParams> params(new ConnectParams);
params->set_target(Identity(url, std::string(), mojom::Connector::kUserRoot));
mojom::ShellClientRequest 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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