Imported existing code

indra/llplugin/llpluginmessagepipe.h

@@ -0,0 +1,92 @@
+/** 
+ * @file llpluginmessagepipe.h
+ * @brief Classes that implement connections from the plugin system to pipes/pumps.
+ *
+ * $LicenseInfo:firstyear=2008&license=viewergpl$
+ * 
+ * Copyright (c) 2008-2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLPLUGINMESSAGEPIPE_H
+#define LL_LLPLUGINMESSAGEPIPE_H
+
+#include "lliosocket.h"
+
+class LLPluginMessagePipe;
+
+// Inherit from this to be able to receive messages from the LLPluginMessagePipe
+class LLPluginMessagePipeOwner
+{
+	LOG_CLASS(LLPluginMessagePipeOwner);
+public:
+	LLPluginMessagePipeOwner();
+	virtual ~LLPluginMessagePipeOwner();
+	// called with incoming messages
+	virtual void receiveMessageRaw(const std::string &message) = 0;
+	// called when the socket has an error
+	virtual apr_status_t socketError(apr_status_t error);
+
+	// called from LLPluginMessagePipe to manage the connection with LLPluginMessagePipeOwner -- do not use!
+	virtual void setMessagePipe(LLPluginMessagePipe *message_pipe) ;
+
+protected:
+	// returns false if writeMessageRaw() would drop the message
+	bool canSendMessage(void);
+	// call this to send a message over the pipe
+	bool writeMessageRaw(const std::string &message);
+	// call this to close the pipe
+	void killMessagePipe(void);
+	
+	LLPluginMessagePipe *mMessagePipe;
+	apr_status_t mSocketError;
+};
+
+class LLPluginMessagePipe
+{
+	LOG_CLASS(LLPluginMessagePipe);
+public:
+	LLPluginMessagePipe(LLPluginMessagePipeOwner *owner, LLSocket::ptr_t socket);
+	virtual ~LLPluginMessagePipe();
+	
+	bool addMessage(const std::string &message);
+	void clearOwner(void);
+	
+	bool pump(F64 timeout = 0.0f);
+	
+protected:	
+	void processInput(void);
+
+	// used internally by pump()
+	void setSocketTimeout(apr_interval_time_t timeout_usec);
+	
+	std::string mInput;
+	std::string mOutput;
+
+	LLPluginMessagePipeOwner *mOwner;
+	LLSocket::ptr_t mSocket;
+};
+
+#endif // LL_LLPLUGINMESSAGE_H