Introduce RegistrationServer.

handler/win/registration_pipe_state.h

Index: handler/win/registration_pipe_state.h
diff --git a/handler/win/registration_pipe_state.h b/handler/win/registration_pipe_state.h
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+++ b/handler/win/registration_pipe_state.h
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+// Copyright 2015 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_HANDLER_WIN_REGISTRATION_PIPE_STATE_H_
+#define CRASHPAD_HANDLER_WIN_REGISTRATION_PIPE_STATE_H_
+
+#include <windows.h>
+
+#include "base/basictypes.h"
+#include "client/registration_protocol_win.h"
+#include "handler/win/registration_server.h"
+#include "util/win/scoped_handle.h"
+
+namespace crashpad {
+
+//! \brief Implements the state and state transitions of a single named pipe for
+//!     the Crashpad client registration protocol for Windows. Each pipe
+//!     instance may handle a single client connection at a time. After each
+//!     connection completes, whether successfully or otherwise, the instance
+//!     will attempt to return to a listening state, ready for a new client
+//!     connection.
+class RegistrationPipeState {
+ public:
+  //! \brief Initializes the state for a single pipe instance. The client must
+  //!     call Initialize() before clients may connect to this pipe.
+  //! \param[in] pipe The named pipe to listen on.
+  //! \param[in] delegate The delegate that will be used to handle requests.
+  RegistrationPipeState(ScopedFileHANDLE pipe,
+                        RegistrationServer::Delegate* delegate);
+  ~RegistrationPipeState();
+
+  //! \brief Places the pipe in the running state, ready to receive and process
+  //!     client connections. Before destroying a running RegistrationPipeState
+  //!     instance you must invoke Stop() and then wait for completion_event()
+  //!     to be signaled one last time.
+  //! \return Returns true if successful, in which case the client must observe
+  //!     completion_event() and invoke OnCompletion() whenever it is signaled.
+  bool Initialize();
+
+  //! \brief Cancels any pending asynchronous operations. After invoking this
+  //!     method you must wait for completion_event() to be signaled before
+  //!     destroying the instance.
+  void Stop();
+
+  //! \brief Returns an event handle that will be signaled whenever an
+  //!     asynchronous operation associated with this instance completes.
+  HANDLE completion_event() { return event_.get(); }
+
+  //! \brief Must be called by the client whenever completion_event() is
+  //!     signaled.
+  //! \return Returns true if the pipe is still in the running state. Otherwise,
+  //!     a permanent failure has occurred and the instance may be immediately
+  //!     destroyed.
+  bool OnCompletion();
+
+ private:
+  using AsyncCompletionHandler =
+      bool (RegistrationPipeState::*)(DWORD bytes_transferred);
+
+  // State transition handlers. Return true if the pipe is still valid.
+
+  bool OnConnectComplete(DWORD /* bytes_transferred */);
+  bool OnReadComplete(DWORD bytes_transferred);
+  bool OnWriteComplete(DWORD bytes_transferred);
+  bool OnWaitForClientCloseComplete(DWORD bytes_transferred);
+
+  // Pipe operations. Return true if the pipe is still valid.
+
+  // Prepares the pipe to accept a new client connecion.
+  bool IssueConnect();
+  // Reads into |request_|.
+  bool IssueRead();
+  // Writes from |response_|.
+  bool IssueWrite();
+  // Issues a final ReadFile() that is expected to be terminated when the client
+  // closes the pipe.
+  bool IssueWaitForClientClose();
+  // Processes |request_| using |delegate_| and stores the result in
+  // |response_|.
+  bool HandleRequest();
+  // Closes the active connection and invokes IssueConnect().
+  bool ResetConnection();
+
+  RegistrationRequest request_;
+  RegistrationResponse response_;
+  // The state transition handler to be invoked when the active asynchronous
+  // operation completes.
+  AsyncCompletionHandler completion_handler_;
+  OVERLAPPED overlapped_;
+  ScopedKernelHANDLE event_;
+  ScopedFileHANDLE pipe_;
+  bool waiting_for_close_;
+  RegistrationServer::Delegate* delegate_;
+  decltype(GetNamedPipeClientProcessId)* get_named_pipe_client_process_id_proc_;
+
+  DISALLOW_COPY_AND_ASSIGN(RegistrationPipeState);
+};
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_HANDLER_WIN_REGISTRATION_PIPE_STATE_H_