6 files changed, 785 insertions, 13 deletions

diff --git a/indra/llmessage/CMakeLists.txt b/indra/llmessage/CMakeLists.txt
index 8bd134dc84..08edf1e5fe 100755
--- a/indra/llmessage/CMakeLists.txt
+++ b/indra/llmessage/CMakeLists.txt
@@ -39,6 +39,7 @@ set(llmessage_SOURCE_FILES
     llcurl.cpp
     lldatapacker.cpp
     lldispatcher.cpp
+    llexperiencecache.cpp
     llfiltersd2xmlrpc.cpp
     llhost.cpp
     llhttpassetstorage.cpp
@@ -129,6 +130,7 @@ set(llmessage_HEADER_FILES
     lldbstrings.h
     lldispatcher.h
     lleventflags.h
+    llexperiencecache.h
     llextendedstatus.h
     llfiltersd2xmlrpc.h
     llfollowcamparams.h
diff --git a/indra/llmessage/llexperiencecache.cpp b/indra/llmessage/llexperiencecache.cpp
new file mode 100644
index 0000000000..1fb77c4391
--- /dev/null
+++ b/indra/llmessage/llexperiencecache.cpp
@@ -0,0 +1,641 @@
+/** 
+ * @file llexperiencecache.cpp
+ * @brief llexperiencecache and related class definitions
+ *
+ * $LicenseInfo:firstyear=2012&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2012, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+#include "llexperiencecache.h"
+
+#include "llavatarname.h"
+#include "llframetimer.h"
+#include "llhttpclient.h"
+#include "llsdserialize.h"
+#include <set>
+#include <map>
+#include "boost/tokenizer.hpp"
+
+
+namespace LLExperienceCache
+{
+
+    typedef std::map<LLUUID, LLUUID> KeyMap;
+    KeyMap privateToPublicKeyMap;
+
+    void mapKeys(const LLSD& legacyKeys);
+
+	std::string sLookupURL;
+
+	typedef std::map<LLUUID, std::string> ask_queue_t;
+	ask_queue_t sAskQueue;
+
+	typedef std::map<LLUUID, F64> pending_queue_t;
+	pending_queue_t sPendingQueue;
+
+	cache_t sCache;
+	int sMaximumLookups = 10;
+
+	LLFrameTimer sRequestTimer;
+
+	// Periodically clean out expired entries from the cache
+	LLFrameTimer sEraseExpiredTimer;
+
+	// May have multiple callbacks for a single ID, which are
+	// represented as multiple slots bound to the signal.
+	// Avoid copying signals via pointers.
+	typedef std::map<LLUUID, callback_signal_t*> signal_map_t;
+	signal_map_t sSignalMap;
+
+
+
+	bool max_age_from_cache_control(const std::string& cache_control, S32 *max_age);
+	void eraseExpired();
+
+	void processExperience( const LLUUID& public_key, const LLSD& experience ) 
+	{
+		sCache[public_key]=experience;
+		LLSD & row = sCache[public_key];
+
+		if(row.has(EXPIRES))
+		{
+			row[EXPIRES] = row[EXPIRES].asReal() + LLFrameTimer::getTotalSeconds();
+		}
+
+		if(row.has(EXPERIENCE_ID))
+		{
+			sPendingQueue.erase(row[EXPERIENCE_ID].asUUID());
+		}
+
+		//signal
+		signal_map_t::iterator sig_it =	sSignalMap.find(public_key);
+		if (sig_it != sSignalMap.end())
+		{
+			callback_signal_t* signal = sig_it->second;
+			(*signal)(experience);
+
+			sSignalMap.erase(public_key);
+
+			delete signal;
+		}
+	}
+
+	void initClass( )
+	{
+	}
+
+	const cache_t& getCached()
+	{
+		return sCache;
+	}
+
+	void setMaximumLookups( int maximumLookups)
+	{
+		sMaximumLookups = maximumLookups;
+	}
+
+	void bootstrap(const LLSD& legacyKeys, int initialExpiration)
+	{
+        mapKeys(legacyKeys);
+		LLSD::array_const_iterator it = legacyKeys.beginArray();
+		for(/**/; it != legacyKeys.endArray(); ++it)
+		{
+			LLSD experience = *it;
+			if(experience.has(EXPERIENCE_ID))
+			{
+				if(!experience.has(EXPIRES))
+				{
+					experience[EXPIRES] = initialExpiration;
+				}
+				processExperience(experience[EXPERIENCE_ID].asUUID(), experience);
+			}
+			else
+			{
+				LL_WARNS("ExperienceCache") 
+					<< "Skipping bootstrap entry which is missing " << EXPERIENCE_ID 
+					<< LL_ENDL;
+			}
+		}		
+	}
+
+
+
+	bool expirationFromCacheControl(LLSD headers, F64 *expires)
+	{
+		// Allow the header to override the default
+		LLSD cache_control_header = headers["cache-control"];
+		if (cache_control_header.isDefined())
+		{
+			S32 max_age = 0;
+			std::string cache_control = cache_control_header.asString();
+			if (max_age_from_cache_control(cache_control, &max_age))
+			{
+				LL_WARNS("ExperienceCache") 
+					<< "got EXPIRES from headers, max_age " << max_age 
+					<< LL_ENDL;
+				F64 now = LLFrameTimer::getTotalSeconds();
+				*expires = now + (F64)max_age;
+				return true;
+			}
+		}
+		return false;
+	}
+
+
+	static const std::string MAX_AGE("max-age");
+	static const boost::char_separator<char> EQUALS_SEPARATOR("=");
+	static const boost::char_separator<char> COMMA_SEPARATOR(",");
+
+	bool max_age_from_cache_control(const std::string& cache_control, S32 *max_age)
+	{
+		// Split the string on "," to get a list of directives
+		typedef boost::tokenizer<boost::char_separator<char> > tokenizer;
+		tokenizer directives(cache_control, COMMA_SEPARATOR);
+
+		tokenizer::iterator token_it = directives.begin();
+		for ( ; token_it != directives.end(); ++token_it)
+		{
+			// Tokens may have leading or trailing whitespace
+			std::string token = *token_it;
+			LLStringUtil::trim(token);
+
+			if (token.compare(0, MAX_AGE.size(), MAX_AGE) == 0)
+			{
+				// ...this token starts with max-age, so let's chop it up by "="
+				tokenizer subtokens(token, EQUALS_SEPARATOR);
+				tokenizer::iterator subtoken_it = subtokens.begin();
+
+				// Must have a token
+				if (subtoken_it == subtokens.end()) return false;
+				std::string subtoken = *subtoken_it;
+
+				// Must exactly equal "max-age"
+				LLStringUtil::trim(subtoken);
+				if (subtoken != MAX_AGE) return false;
+
+				// Must have another token
+				++subtoken_it;
+				if (subtoken_it == subtokens.end()) return false;
+				subtoken = *subtoken_it;
+
+				// Must be a valid integer
+				// *NOTE: atoi() returns 0 for invalid values, so we have to
+				// check the string first.
+				// *TODO: Do servers ever send "0000" for zero?  We don't handle it
+				LLStringUtil::trim(subtoken);
+				if (subtoken == "0")
+				{
+					*max_age = 0;
+					return true;
+				}
+				S32 val = atoi( subtoken.c_str() );
+				if (val > 0 && val < S32_MAX)
+				{
+					*max_age = val;
+					return true;
+				}
+				return false;
+			}
+		}
+		return false;
+	}
+
+
+	void importFile(std::istream& istr)
+	{
+		LLSD data;
+		S32 parse_count = LLSDSerialize::fromXMLDocument(data, istr);
+		if(parse_count < 1) return;
+
+		LLSD experiences = data["experiences"];
+
+		LLUUID public_key;
+		LLSD::map_const_iterator it = experiences.beginMap();
+		for(; it != experiences.endMap() ; ++it)
+		{
+			public_key.set(it->first);
+			sCache[public_key]=it->second;
+		}
+
+		LL_DEBUGS("ExperienceCache") << "importFile() loaded " << sCache.size() << LL_ENDL;
+	}
+
+	void exportFile(std::ostream& ostr)
+	{
+		LLSD experiences;
+
+		cache_t::const_iterator it =sCache.begin();
+		for( ; it != sCache.end() ; ++it)
+		{
+			if(!it->second.has(EXPERIENCE_ID) || it->second[EXPERIENCE_ID].asUUID().isNull() ||
+				it->second.has("DoesNotExist") || (it->second.has(PROPERTIES) && it->second[PROPERTIES].asInteger() & PROPERTY_INVALID))
+				continue;
+
+			experiences[it->first.asString()] = it->second;
+		}
+
+		LLSD data;
+		data["experiences"] = experiences;
+
+		LLSDSerialize::toPrettyXML(data, ostr);
+	}
+
+	class LLExperienceResponder : public LLCurl::Responder
+	{
+	public:
+		LLExperienceResponder(const ask_queue_t& keys)
+			:mKeys(keys)
+		{
+
+		}
+
+		/*virtual*/ void httpSuccess()
+		{
+			LLSD experiences = getContent()["experience_keys"];
+			LLSD::array_const_iterator it = experiences.beginArray();
+			for( /**/ ; it != experiences.endArray(); ++it)
+			{
+				const LLSD& row = *it;
+				LLUUID public_key = row[EXPERIENCE_ID].asUUID();
+
+
+				LL_DEBUGS("ExperienceCache") << "Received result for " << public_key 
+					<< " display '" << row[LLExperienceCache::NAME].asString() << "'" << LL_ENDL ;
+
+				processExperience(public_key, row);
+			}
+
+			LLSD error_ids = getContent()["error_ids"];
+			LLSD::array_const_iterator errIt = error_ids.beginArray();
+			for( /**/ ; errIt != error_ids.endArray() ; ++errIt )
+			{
+				LLUUID id = errIt->asUUID();		
+				LLSD exp;
+				exp[EXPIRES]=DEFAULT_EXPIRATION;
+				exp[EXPERIENCE_ID] = id;
+				exp[PROPERTIES]=PROPERTY_INVALID;
+				exp[MISSING]=true;
+                exp[QUOTA] = DEFAULT_QUOTA;
+
+				processExperience(id, exp);
+				LL_WARNS("ExperienceCache") << "LLExperienceResponder::result() error result for " << id << LL_ENDL ;
+			}
+
+			LL_DEBUGS("ExperienceCache") << sCache.size() << " cached experiences" << LL_ENDL;
+		}
+
+		/*virtual*/ void httpFailure()
+		{
+ 			LL_WARNS("ExperienceCache") << "Request failed "<<getStatus()<<" "<<getReason()<< LL_ENDL;
+ 			// We're going to construct a dummy record and cache it for a while,
+ 			// either briefly for a 503 Service Unavailable, or longer for other
+ 			// errors.
+ 			F64 retry_timestamp = errorRetryTimestamp(getStatus());
+ 
+ 
+ 			// Add dummy records for all agent IDs in this request
+ 			ask_queue_t::const_iterator it = mKeys.begin();
+ 			for ( ; it != mKeys.end(); ++it)
+			{
+
+				LLSD exp = get(it->first);
+                //leave the properties alone if we already have a cache entry for this xp
+                if(exp.isUndefined())
+                {
+                    exp[PROPERTIES]=PROPERTY_INVALID;
+                }
+				exp[EXPIRES]=retry_timestamp;
+				exp[EXPERIENCE_ID] = it->first;
+				exp["key_type"] = it->second;
+				exp["uuid"] = it->first;
+				exp["error"] = (LLSD::Integer)getStatus();
+                exp[QUOTA] = DEFAULT_QUOTA;
+
+ 				LLExperienceCache::processExperience(it->first, exp);
+ 			}
+
+		}
+
+		// Return time to retry a request that generated an error, based on
+		// error type and headers.  Return value is seconds-since-epoch.
+		F64 errorRetryTimestamp(S32 status)
+		{
+
+			// Retry-After takes priority
+			LLSD retry_after = getResponseHeaders()["retry-after"];
+			if (retry_after.isDefined())
+			{
+				// We only support the delta-seconds type
+				S32 delta_seconds = retry_after.asInteger();
+				if (delta_seconds > 0)
+				{
+					// ...valid delta-seconds
+					return F64(delta_seconds);
+				}
+			}
+
+			// If no Retry-After, look for Cache-Control max-age
+			F64 expires = 0.0;
+			if (LLExperienceCache::expirationFromCacheControl(getResponseHeaders(), &expires))
+			{
+				return expires;
+			}
+
+			// No information in header, make a guess
+			if (status == 503)
+			{
+				// ...service unavailable, retry soon
+				const F64 SERVICE_UNAVAILABLE_DELAY = 600.0; // 10 min
+				return SERVICE_UNAVAILABLE_DELAY;
+			}
+			else if (status == 499)
+			{
+				// ...we were probably too busy, retry quickly
+				const F64 BUSY_DELAY = 10.0; // 10 seconds
+				return BUSY_DELAY;
+
+			}
+			else
+			{
+				// ...other unexpected error
+				const F64 DEFAULT_DELAY = 3600.0; // 1 hour
+				return DEFAULT_DELAY;
+			}
+		}
+
+	private:
+		ask_queue_t mKeys;
+	};
+
+	void requestExperiences() 
+	{
+		if(sAskQueue.empty() || sLookupURL.empty())
+			return;
+
+		F64 now = LLFrameTimer::getTotalSeconds();
+
+		const U32 EXP_URL_SEND_THRESHOLD = 3000;
+		const U32 PAGE_SIZE = EXP_URL_SEND_THRESHOLD/UUID_STR_LENGTH;
+
+		std::ostringstream ostr;
+
+		ask_queue_t keys;
+
+		ostr << sLookupURL << "?page_size=" << PAGE_SIZE;
+
+
+		int request_count = 0;
+		while(!sAskQueue.empty() && request_count < sMaximumLookups)
+		{
+			ask_queue_t::iterator it = sAskQueue.begin();
+			const LLUUID& key = it->first;
+			const std::string& key_type = it->second;
+
+			ostr << '&' << key_type << '=' << key.asString() ;
+		
+			keys[key]=key_type;
+			request_count++;
+
+			sPendingQueue[key] = now;
+			
+			if(ostr.tellp() > EXP_URL_SEND_THRESHOLD)
+			{
+				LL_DEBUGS("ExperienceCache") <<  "requestExperiences() query: " << ostr.str() << LL_ENDL;
+				LLHTTPClient::get(ostr.str(), new LLExperienceResponder(keys));
+				ostr.clear();
+				ostr.str(sLookupURL);
+				ostr << "?page_size=" << PAGE_SIZE;
+				keys.clear();
+			}
+			sAskQueue.erase(it);
+		}
+
+		if(ostr.tellp() > sLookupURL.size())
+		{
+			LL_DEBUGS("ExperienceCache") <<  "requestExperiences() query 2: " << ostr.str() << LL_ENDL;
+			LLHTTPClient::get(ostr.str(), new LLExperienceResponder(keys));
+		}
+	}
+
+	bool isRequestPending(const LLUUID& public_key)
+	{
+		bool isPending = false;
+		const F64 PENDING_TIMEOUT_SECS = 5.0 * 60.0;
+
+		pending_queue_t::const_iterator it = sPendingQueue.find(public_key);
+
+		if(it != sPendingQueue.end())
+		{
+			F64 expire_time = LLFrameTimer::getTotalSeconds() - PENDING_TIMEOUT_SECS;
+			isPending = (it->second > expire_time);
+		}
+
+		return isPending;
+	}
+
+
+	void setLookupURL( const std::string& lookup_url )
+	{
+		sLookupURL = lookup_url;
+		if(!sLookupURL.empty())
+		{
+			sLookupURL += "id/";
+		}
+	}
+
+	bool hasLookupURL()
+	{
+		return !sLookupURL.empty();
+	}
+
+	void idle()
+	{
+
+		const F32 SECS_BETWEEN_REQUESTS = 0.1f;
+		if (!sRequestTimer.checkExpirationAndReset(SECS_BETWEEN_REQUESTS))
+		{
+			return;
+		}
+
+		// Must be large relative to above
+		const F32 ERASE_EXPIRED_TIMEOUT = 60.f; // seconds
+		if (sEraseExpiredTimer.checkExpirationAndReset(ERASE_EXPIRED_TIMEOUT))
+		{
+			eraseExpired();
+		}
+
+
+		if(!sAskQueue.empty())
+		{
+			requestExperiences();
+		}
+	}
+
+	void erase( const LLUUID& key )
+	{
+		cache_t::iterator it = sCache.find(key);
+				
+		if(it != sCache.end())
+		{
+			sCache.erase(it);
+		}
+	}
+
+	void eraseExpired()
+	{
+		F64 now = LLFrameTimer::getTotalSeconds();
+		cache_t::iterator it = sCache.begin();
+		while (it != sCache.end())
+		{
+			cache_t::iterator cur = it;
+			LLSD& exp = cur->second;
+			++it;
+
+			if(exp.has(EXPIRES) && exp[EXPIRES].asReal() < now)
+			{
+                if(!exp.has(EXPERIENCE_ID))
+				{
+                    LL_WARNS("ExperienceCache") << "Removing experience with no id " << LL_ENDL ;
+                    sCache.erase(cur);
+					}
+                else
+                {
+                    LLUUID id = exp[EXPERIENCE_ID].asUUID();
+                    LLUUID private_key = exp.has(LLExperienceCache::PRIVATE_KEY) ? exp[LLExperienceCache::PRIVATE_KEY].asUUID():LLUUID::null;
+                    if(private_key.notNull() || !exp.has("DoesNotExist"))
+					{
+						fetch(id, true);
+					}
+					else
+					{
+                        LL_WARNS("ExperienceCache") << "Removing invalid experience " << id << LL_ENDL ;
+						sCache.erase(cur);
+					}
+				}
+			}
+		}
+	}
+
+	
+	bool fetch( const LLUUID& key, bool refresh/* = true*/ ) 
+	{
+		if(!key.isNull() && !isRequestPending(key) && (refresh || sCache.find(key)==sCache.end()))
+		{
+			LL_DEBUGS("ExperienceCache") << " queue request for " << EXPERIENCE_ID << " " << key << LL_ENDL ;
+			sAskQueue[key]=EXPERIENCE_ID;
+
+			return true;
+		}
+		return false;
+	}
+
+	void insert(const LLSD& experience_data )
+	{
+		if(experience_data.has(EXPERIENCE_ID))
+		{
+            processExperience(experience_data[EXPERIENCE_ID].asUUID(), experience_data);
+		}
+		else
+		{
+			LL_WARNS("ExperienceCache") << ": Ignoring cache insert of experience which is missing " << EXPERIENCE_ID << LL_ENDL;
+		}
+	}
+	static LLSD empty;
+	const LLSD& get(const LLUUID& key)
+	{
+		if(key.isNull()) return empty;
+		cache_t::const_iterator it = sCache.find(key);
+
+		if (it != sCache.end())
+		{
+			return it->second;
+		}
+
+		fetch(key);
+
+		return empty;
+	}
+	void get( const LLUUID& key, callback_slot_t slot )
+	{
+		if(key.isNull()) return;
+
+		cache_t::const_iterator it = sCache.find(key);
+		if (it != sCache.end())
+		{
+			// ...name already exists in cache, fire callback now
+			callback_signal_t signal;
+			signal.connect(slot);
+			
+			signal(it->second);
+			return;
+		}
+
+		fetch(key);
+
+		// always store additional callback, even if request is pending
+		signal_map_t::iterator sig_it = sSignalMap.find(key);
+		if (sig_it == sSignalMap.end())
+		{
+			// ...new callback for this id
+			callback_signal_t* signal = new callback_signal_t();
+			signal->connect(slot);
+			sSignalMap[key] = signal;
+		}
+		else
+		{
+			// ...existing callback, bind additional slot
+			callback_signal_t* signal = sig_it->second;
+			signal->connect(slot);
+		}
+	}
+
+}
+
+
+void LLExperienceCache::mapKeys( const LLSD& legacyKeys )
+{
+	LLSD::array_const_iterator exp = legacyKeys.beginArray();
+	for(/**/ ; exp != legacyKeys.endArray() ; ++exp)
+	{
+		if(exp->has(LLExperienceCache::EXPERIENCE_ID) && exp->has(LLExperienceCache::PRIVATE_KEY))
+		{
+            privateToPublicKeyMap[(*exp)[LLExperienceCache::PRIVATE_KEY].asUUID()]=(*exp)[LLExperienceCache::EXPERIENCE_ID].asUUID();
+		}
+	}
+}
+
+
+LLUUID LLExperienceCache::getExperienceId(const LLUUID& private_key, bool null_if_not_found)
+{
+	if (private_key.isNull())
+		return LLUUID::null;
+
+    KeyMap::const_iterator it=privateToPublicKeyMap.find(private_key);
+    if(it == privateToPublicKeyMap.end())
+	{
+		if(null_if_not_found)
+		{
+			return LLUUID::null;
+		}
+		return private_key;
+	}
+	LL_WARNS("LLExperience") << "converted private key " << private_key << " to experience_id " << it->second << LL_ENDL;
+	return it->second;
+}
diff --git a/indra/llmessage/llexperiencecache.h b/indra/llmessage/llexperiencecache.h
new file mode 100644
index 0000000000..e669ee888e
--- /dev/null
+++ b/indra/llmessage/llexperiencecache.h
@@ -0,0 +1,104 @@
+/** 
+ * @file llexperiencecache.h
+ * @brief Caches information relating to experience keys
+ *
+ * $LicenseInfo:firstyear=2012&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2012, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+
+
+#ifndef LL_LLEXPERIENCECACHE_H
+#define LL_LLEXPERIENCECACHE_H
+
+#include "linden_common.h"
+#include <boost/signals2.hpp>
+
+class LLSD;
+class LLUUID;
+
+
+
+namespace LLExperienceCache
+{
+	const std::string PRIVATE_KEY	= "private_id";
+    const std::string MISSING       = "DoesNotExist";
+
+    const std::string AGENT_ID      = "agent_id";
+    const std::string GROUP_ID      = "group_id";
+	const std::string EXPERIENCE_ID	= "public_id";
+	const std::string NAME			= "name";
+	const std::string PROPERTIES	= "properties";
+	const std::string EXPIRES		= "expiration";  
+    const std::string DESCRIPTION	= "description";
+    const std::string QUOTA         = "quota";
+    const std::string MATURITY      = "maturity";
+    const std::string METADATA      = "extended_metadata";
+    const std::string SLURL         = "slurl";
+
+
+	// should be in sync with experience-api/experiences/models.py
+	const int PROPERTY_INVALID		= 1 << 0;
+	const int PROPERTY_PRIVILEGED	= 1 << 3;
+	const int PROPERTY_GRID			= 1 << 4;
+	const int PROPERTY_PRIVATE		= 1 << 5;
+	const int PROPERTY_DISABLED		= 1 << 6;  
+	const int PROPERTY_SUSPENDED	    = 1 << 7;
+
+
+	// default values
+	const static F64 DEFAULT_EXPIRATION = 600.0;
+	const static S32 DEFAULT_QUOTA = 128; // this is megabytes
+
+	// Callback types for get() below
+	typedef boost::signals2::signal<void (const LLSD& experience)>
+		callback_signal_t;
+	typedef callback_signal_t::slot_type callback_slot_t;
+	typedef std::map<LLUUID, LLSD> cache_t;
+
+
+	void setLookupURL(const std::string& lookup_url);
+	bool hasLookupURL();
+
+	void setMaximumLookups(int maximumLookups);
+
+	void idle();
+	void exportFile(std::ostream& ostr);
+	void importFile(std::istream& istr);
+	void initClass();
+	void bootstrap(const LLSD& legacyKeys, int initialExpiration);
+	
+	void erase(const LLUUID& key);
+	bool fetch(const LLUUID& key, bool refresh=false);
+	void insert(const LLSD& experience_data);
+	const LLSD& get(const LLUUID& key);
+
+	// If name information is in cache, callback will be called immediately.
+	void get(const LLUUID& key, callback_slot_t slot);
+
+	const cache_t& getCached();
+
+	// maps an experience private key to the experience id
+	LLUUID getExperienceId(const LLUUID& private_key, bool null_if_not_found=false);
+
+};
+
+#endif // LL_LLEXPERIENCECACHE_H
diff --git a/indra/llmessage/llregionflags.h b/indra/llmessage/llregionflags.h
index 40d7b04a90..eb0c4e6d1e 100755
--- a/indra/llmessage/llregionflags.h
+++ b/indra/llmessage/llregionflags.h
@@ -148,19 +148,20 @@ const U32 ESTATE_ACCESS_ALL = ESTATE_ACCESS_ALLOWED_AGENTS
 							  | ESTATE_ACCESS_BANNED_AGENTS
 							  | ESTATE_ACCESS_MANAGERS;
 
-// for EstateOwnerRequest, estateaccessdelta message
-const U32 ESTATE_ACCESS_APPLY_TO_ALL_ESTATES		= 1 << 0;
-const U32 ESTATE_ACCESS_APPLY_TO_MANAGED_ESTATES	= 1 << 1;
-
-const U32 ESTATE_ACCESS_ALLOWED_AGENT_ADD			= 1 << 2;
-const U32 ESTATE_ACCESS_ALLOWED_AGENT_REMOVE		= 1 << 3;
-const U32 ESTATE_ACCESS_ALLOWED_GROUP_ADD			= 1 << 4;
-const U32 ESTATE_ACCESS_ALLOWED_GROUP_REMOVE		= 1 << 5;
-const U32 ESTATE_ACCESS_BANNED_AGENT_ADD			= 1 << 6;
-const U32 ESTATE_ACCESS_BANNED_AGENT_REMOVE			= 1 << 7;
-const U32 ESTATE_ACCESS_MANAGER_ADD					= 1 << 8;
-const U32 ESTATE_ACCESS_MANAGER_REMOVE				= 1 << 9;
-const U32 ESTATE_ACCESS_NO_REPLY                                  = 1 << 10;
+// for EstateOwnerRequest, estateaccessdelta, estateexperiencedelta messages
+const U32 ESTATE_ACCESS_APPLY_TO_ALL_ESTATES		= 1U << 0;
+const U32 ESTATE_ACCESS_APPLY_TO_MANAGED_ESTATES	= 1U << 1;
+
+const U32 ESTATE_ACCESS_ALLOWED_AGENT_ADD			= 1U << 2;
+const U32 ESTATE_ACCESS_ALLOWED_AGENT_REMOVE			= 1U << 3;
+const U32 ESTATE_ACCESS_ALLOWED_GROUP_ADD			= 1U << 4;
+const U32 ESTATE_ACCESS_ALLOWED_GROUP_REMOVE			= 1U << 5;
+const U32 ESTATE_ACCESS_BANNED_AGENT_ADD				= 1U << 6;
+const U32 ESTATE_ACCESS_BANNED_AGENT_REMOVE			= 1U << 7;
+const U32 ESTATE_ACCESS_MANAGER_ADD					= 1U << 8;
+const U32 ESTATE_ACCESS_MANAGER_REMOVE				= 1U << 9;
+const U32 ESTATE_ACCESS_NO_REPLY						= 1U << 10;
+const U32 ESTATE_ACCESS_FAILED_BAN_ESTATE_MANAGER	= 1U << 11;
 
 const S32 ESTATE_MAX_MANAGERS = 10;
 const S32 ESTATE_MAX_ACCESS_IDS = 500;	// max for access, banned
@@ -171,6 +172,26 @@ const U32 SWD_OTHERS_LAND_ONLY		= (1 << 0);
 const U32 SWD_ALWAYS_RETURN_OBJECTS = (1 << 1);
 const U32 SWD_SCRIPTED_ONLY			= (1 << 2);
 
+// Controls experience key validity in the estate
+const U32 EXPERIENCE_KEY_TYPE_NONE		= 0;
+const U32 EXPERIENCE_KEY_TYPE_BLOCKED	= 1;
+const U32 EXPERIENCE_KEY_TYPE_ALLOWED	= 2;
+const U32 EXPERIENCE_KEY_TYPE_TRUSTED	= 3;
+
+const U32 EXPERIENCE_KEY_TYPE_FIRST		= EXPERIENCE_KEY_TYPE_BLOCKED;
+const U32 EXPERIENCE_KEY_TYPE_LAST		= EXPERIENCE_KEY_TYPE_TRUSTED;
+
+//
+const U32 ESTATE_EXPERIENCE_TRUSTED_ADD		= 1U << 2;
+const U32 ESTATE_EXPERIENCE_TRUSTED_REMOVE	= 1U << 3;
+const U32 ESTATE_EXPERIENCE_ALLOWED_ADD		= 1U << 4;
+const U32 ESTATE_EXPERIENCE_ALLOWED_REMOVE	= 1U << 5;
+const U32 ESTATE_EXPERIENCE_BLOCKED_ADD		= 1U << 6;
+const U32 ESTATE_EXPERIENCE_BLOCKED_REMOVE	= 1U << 7;
+
+const S32 ESTATE_MAX_EXPERIENCE_IDS = 8;
+
+
 #endif
 
 
diff --git a/indra/llmessage/message_prehash.cpp b/indra/llmessage/message_prehash.cpp
index 39cfb6019e..e0f69dc2d3 100755
--- a/indra/llmessage/message_prehash.cpp
+++ b/indra/llmessage/message_prehash.cpp
@@ -1383,3 +1383,5 @@ char const* const _PREHASH_GroupAVSounds = LLMessageStringTable::getInstance()->
 char const* const _PREHASH_AppearanceData = LLMessageStringTable::getInstance()->getString("AppearanceData");
 char const* const _PREHASH_AppearanceVersion = LLMessageStringTable::getInstance()->getString("AppearanceVersion");
 char const* const _PREHASH_CofVersion = LLMessageStringTable::getInstance()->getString("CofVersion");
+char const* const _PREHASH_Experience = LLMessageStringTable::getInstance()->getString("Experience");
+char const* const _PREHASH_ExperienceID = LLMessageStringTable::getInstance()->getString("ExperienceID");
diff --git a/indra/llmessage/message_prehash.h b/indra/llmessage/message_prehash.h
index 573e10dc0b..fb8dcc17fb 100755
--- a/indra/llmessage/message_prehash.h
+++ b/indra/llmessage/message_prehash.h
@@ -1383,4 +1383,6 @@ extern char const* const _PREHASH_GroupAVSounds;
 extern char const* const _PREHASH_AppearanceData;
 extern char const* const _PREHASH_AppearanceVersion;
 extern char const* const _PREHASH_CofVersion;
+extern char const* const _PREHASH_Experience;
+extern char const* const _PREHASH_ExperienceID;
 #endif