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1 // Copyright 2016 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "services/shell/background/background_shell.h" | |
6 | |
7 #include "base/bind.h" | |
8 #include "base/bind_helpers.h" | |
9 #include "base/command_line.h" | |
10 #include "base/logging.h" | |
11 #include "base/memory/ptr_util.h" | |
12 #include "base/message_loop/message_pump_default.h" | |
13 #include "base/path_service.h" | |
14 #include "base/run_loop.h" | |
15 #include "base/single_thread_task_runner.h" | |
16 #include "base/synchronization/waitable_event.h" | |
17 #include "base/threading/simple_thread.h" | |
18 #include "services/catalog/store.h" | |
19 #include "services/shell/connect_params.h" | |
20 #include "services/shell/public/cpp/service.h" | |
21 #include "services/shell/public/cpp/service_context.h" | |
22 #include "services/shell/service_manager.h" | |
23 #include "services/shell/standalone/context.h" | |
24 | |
25 namespace shell { | |
26 | |
27 namespace { | |
28 | |
29 std::unique_ptr<base::MessagePump> CreateDefaultMessagePump() { | |
30 return base::WrapUnique(new base::MessagePumpDefault); | |
31 } | |
32 | |
33 class MojoMessageLoop : public base::MessageLoop { | |
34 public: | |
35 MojoMessageLoop() | |
36 : base::MessageLoop(base::MessageLoop::TYPE_CUSTOM, | |
37 base::Bind(&CreateDefaultMessagePump)) {} | |
38 ~MojoMessageLoop() override {} | |
39 | |
40 void BindToCurrentThread() { base::MessageLoop::BindToCurrentThread(); } | |
41 | |
42 private: | |
43 DISALLOW_COPY_AND_ASSIGN(MojoMessageLoop); | |
44 }; | |
45 | |
46 } // namespace | |
47 | |
48 // Manages the thread to startup mojo. | |
49 class BackgroundShell::MojoThread : public base::SimpleThread { | |
50 public: | |
51 explicit MojoThread(std::unique_ptr<BackgroundShell::InitParams> init_params) | |
52 : SimpleThread("mojo-background-shell"), | |
53 init_params_(std::move(init_params)) {} | |
54 ~MojoThread() override {} | |
55 | |
56 void CreateServiceRequest(base::WaitableEvent* signal, | |
57 const std::string& name, | |
58 mojom::ServiceRequest* request) { | |
59 // Only valid to call this on the background thread. | |
60 DCHECK(message_loop_->task_runner()->BelongsToCurrentThread()); | |
61 *request = context_->service_manager()->StartEmbedderService(name); | |
62 signal->Signal(); | |
63 } | |
64 | |
65 void Connect(std::unique_ptr<ConnectParams> params) { | |
66 context_->service_manager()->Connect(std::move(params)); | |
67 } | |
68 | |
69 base::MessageLoop* message_loop() { return message_loop_; } | |
70 | |
71 // Stops the background thread. | |
72 void Stop() { | |
73 DCHECK_NE(message_loop_, base::MessageLoop::current()); | |
74 message_loop_->task_runner()->PostTask( | |
75 FROM_HERE, base::MessageLoop::QuitWhenIdleClosure()); | |
76 Join(); | |
77 } | |
78 | |
79 void RunServiceManagerCallback( | |
80 const BackgroundShell::ServiceManagerThreadCallback& callback) { | |
81 DCHECK(message_loop_->task_runner()->BelongsToCurrentThread()); | |
82 callback.Run(context_->service_manager()); | |
83 } | |
84 | |
85 // base::SimpleThread: | |
86 void Start() override { | |
87 DCHECK(!message_loop_); | |
88 message_loop_ = new MojoMessageLoop; | |
89 base::SimpleThread::Start(); | |
90 } | |
91 void Run() override { | |
92 // The construction/destruction order is very finicky and has to be done | |
93 // in the order here. | |
94 std::unique_ptr<base::MessageLoop> message_loop(message_loop_); | |
95 | |
96 std::unique_ptr<Context::InitParams> context_init_params( | |
97 new Context::InitParams); | |
98 if (init_params_) { | |
99 context_init_params->catalog_store = | |
100 std::move(init_params_->catalog_store); | |
101 context_init_params->native_runner_delegate = | |
102 init_params_->native_runner_delegate; | |
103 context_init_params->init_edk = init_params_->init_edk; | |
104 } | |
105 if (context_init_params->init_edk) | |
106 Context::EnsureEmbedderIsInitialized(); | |
107 | |
108 message_loop_->BindToCurrentThread(); | |
109 | |
110 std::unique_ptr<Context> context(new Context); | |
111 context_ = context.get(); | |
112 context_->Init(std::move(context_init_params)); | |
113 | |
114 base::RunLoop().Run(); | |
115 | |
116 // Has to happen after run, but while messageloop still valid. | |
117 context_->Shutdown(); | |
118 | |
119 // Context has to be destroyed after the MessageLoop has been destroyed. | |
120 message_loop.reset(); | |
121 context_ = nullptr; | |
122 } | |
123 | |
124 private: | |
125 // We own this. It's created on the main thread, but destroyed on the | |
126 // background thread. | |
127 MojoMessageLoop* message_loop_ = nullptr; | |
128 // Created in Run() on the background thread. | |
129 Context* context_ = nullptr; | |
130 | |
131 std::unique_ptr<BackgroundShell::InitParams> init_params_; | |
132 | |
133 DISALLOW_COPY_AND_ASSIGN(MojoThread); | |
134 }; | |
135 | |
136 BackgroundShell::InitParams::InitParams() {} | |
137 BackgroundShell::InitParams::~InitParams() {} | |
138 | |
139 BackgroundShell::BackgroundShell() {} | |
140 | |
141 BackgroundShell::~BackgroundShell() { | |
142 thread_->Stop(); | |
143 } | |
144 | |
145 void BackgroundShell::Init(std::unique_ptr<InitParams> init_params) { | |
146 DCHECK(!thread_); | |
147 thread_.reset(new MojoThread(std::move(init_params))); | |
148 thread_->Start(); | |
149 } | |
150 | |
151 mojom::ServiceRequest BackgroundShell::CreateServiceRequest( | |
152 const std::string& name) { | |
153 std::unique_ptr<ConnectParams> params(new ConnectParams); | |
154 params->set_source(CreateServiceManagerIdentity()); | |
155 params->set_target(Identity(name, mojom::kRootUserID)); | |
156 mojom::ServiceRequest request; | |
157 base::WaitableEvent signal(base::WaitableEvent::ResetPolicy::MANUAL, | |
158 base::WaitableEvent::InitialState::NOT_SIGNALED); | |
159 thread_->message_loop()->task_runner()->PostTask( | |
160 FROM_HERE, | |
161 base::Bind(&MojoThread::CreateServiceRequest, | |
162 base::Unretained(thread_.get()), &signal, name, &request)); | |
163 signal.Wait(); | |
164 thread_->message_loop()->task_runner()->PostTask( | |
165 FROM_HERE, | |
166 base::Bind(&MojoThread::Connect, base::Unretained(thread_.get()), | |
167 base::Passed(¶ms))); | |
168 return request; | |
169 } | |
170 | |
171 void BackgroundShell::ExecuteOnServiceManagerThread( | |
172 const ServiceManagerThreadCallback& callback) { | |
173 thread_->message_loop()->task_runner()->PostTask( | |
174 FROM_HERE, base::Bind(&MojoThread::RunServiceManagerCallback, | |
175 base::Unretained(thread_.get()), callback)); | |
176 } | |
177 | |
178 } // namespace shell | |
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