James Robinson | 646469d | 2014-10-03 15:33:28 -0700 | [diff] [blame] | 1 | // Copyright (c) 2012 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 | #ifndef TOOLS_ANDROID_FORWARDER2_DAEMON_H_ |
| 6 | #define TOOLS_ANDROID_FORWARDER2_DAEMON_H_ |
| 7 | |
| 8 | #include <string> |
| 9 | |
| 10 | #include "base/basictypes.h" |
| 11 | #include "base/memory/scoped_ptr.h" |
| 12 | |
| 13 | namespace forwarder2 { |
| 14 | |
| 15 | class Socket; |
| 16 | |
| 17 | // Provides a way to spawn a daemon and communicate with it. |
| 18 | class Daemon { |
| 19 | public: |
| 20 | // Callback used by the daemon to shutdown properly. See pipe_notifier.h for |
| 21 | // more details. |
| 22 | typedef int (*GetExitNotifierFDCallback)(); |
| 23 | |
| 24 | class ClientDelegate { |
| 25 | public: |
| 26 | virtual ~ClientDelegate() {} |
| 27 | |
| 28 | // Called after the daemon is ready to receive commands. |
| 29 | virtual void OnDaemonReady(Socket* daemon_socket) = 0; |
| 30 | }; |
| 31 | |
| 32 | class ServerDelegate { |
| 33 | public: |
| 34 | virtual ~ServerDelegate() {} |
| 35 | |
| 36 | // Called after the daemon bound its Unix Domain Socket. This can be used to |
| 37 | // setup signal handlers or perform global initialization. |
| 38 | virtual void Init() = 0; |
| 39 | |
| 40 | virtual void OnClientConnected(scoped_ptr<Socket> client_socket) = 0; |
| 41 | }; |
| 42 | |
| 43 | // |identifier| should be a unique string identifier. It is used to |
| 44 | // bind/connect the underlying Unix Domain Socket. |
| 45 | // Note that this class does not take ownership of |client_delegate| and |
| 46 | // |server_delegate|. |
| 47 | Daemon(const std::string& log_file_path, |
| 48 | const std::string& identifier, |
| 49 | ClientDelegate* client_delegate, |
| 50 | ServerDelegate* server_delegate, |
| 51 | GetExitNotifierFDCallback get_exit_fd_callback); |
| 52 | |
| 53 | ~Daemon(); |
| 54 | |
| 55 | // Returns whether the daemon was successfully spawned. Note that this does |
| 56 | // not necessarily mean that the current process was forked in case the daemon |
| 57 | // is already running. |
| 58 | bool SpawnIfNeeded(); |
| 59 | |
| 60 | // Kills the daemon and blocks until it exited. Returns whether it succeeded. |
| 61 | bool Kill(); |
| 62 | |
| 63 | private: |
| 64 | const std::string log_file_path_; |
| 65 | const std::string identifier_; |
| 66 | ClientDelegate* const client_delegate_; |
| 67 | ServerDelegate* const server_delegate_; |
| 68 | const GetExitNotifierFDCallback get_exit_fd_callback_; |
| 69 | |
| 70 | DISALLOW_COPY_AND_ASSIGN(Daemon); |
| 71 | }; |
| 72 | |
| 73 | } // namespace forwarder2 |
| 74 | |
| 75 | #endif // TOOLS_ANDROID_FORWARDER2_DAEMON_H_ |