Dataserver

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! Event: dataserver( key queryid, string data ){ ; }

24	Event ID
	Delay

Triggered when task receives asynchronous data

• key	queryid	–	matches the return of the requesting function
• string	data	–	the requested data (cast as a string as necessary).

Function	Input		Decode	Description
llGetNotecardLine			string	The line in the requested notecard, limited to 255 bytes. If EOF the line requested is past the end of the notecard.
llGetNumberOfNotecardLines			(integer)	The number of lines in the notecard requested.
llRequestAgentData	DATA_ONLINE	1	(integer) boolean	If the requested agent is online
	DATA_NAME	2	string	The requested agent's legacy name
	DATA_BORN	3	string	The account creation/"born on" date as a string in an ISO 8601 format of YYYY-MM-DD.
	DATA_RATING	4	llCSV2List()	Deprecated: Returns [0, 0, 0, 0, 0, 0] Used to return: [pos_behavior, neg_behavior, pos_appearance, neg_appearance, pos_building, neg_building]
	DATA_PAYINFO	8	(integer) mask	Flag			Description
				PAYMENT_INFO_ON_FILE		0x1	If payment info is on file.
				PAYMENT_INFO_USED		0x2	If payment info has been used.
llRequestDisplayName			(string)	The agent's display name
llRequestUsername			(string)	The agent's username (legacy format: "first.last")
llRequestInventoryData	Landmark		(vector)	The vector data received by dataserver is a global position as an offset from the current region's origin (<0,0,0>). To obtain the absolute global position of a landmark, add llGetRegionCorner() to the vector.
llRequestSimulatorData	DATA_SIM_POS	5	(vector)	The regions global position.
	DATA_SIM_STATUS	6	string	Value	Description
				"up"	region currently up and running
				"down"	region currently down
				"starting"	region currently starting
				"stopping"	region currently stopping
				"crashed"	region has crashed
				"unknown"	region status unknown or unknown region
	DATA_SIM_RATING	7	string	Value	Maturity rating
				"PG"	General
				"MATURE"	Moderate
				"ADULT"	Adult
				"UNKNOWN"	rating or region unknown

Caveats

Dataserver requests will trigger dataserver events in all scripts within the same prim where the request was made.
- If there are multiple scripts with dataserver events in the same prim, always use the queryid key to determine which answer is being received.
- dataserver events will not be triggered in scripts contained in other prims in the same linked object.
When dealing with multiple dataserver queries it is possible to receive the responses in any order, if you receive a response at all. It is good practise to maintain variables (or a list) with keys of all data server events you are waiting for, then use queryid
- When using if (dKey == queryid), or similar, in your dataserver events it is important to remember that changes to dKey will cause your script to ignore any requests that were made earlier that have not yet arrived; consider using more than one variable (or a list) if such cases may cause desired events to be ignored.
- When using a list to track events, it is important to periodically check the list for requests that have taken too long and either resend them, or remove them (see examples), as it is possible for any dataserver request to fail, usually due to high traffic or the script receiving too many other events.

Examples

<lsl> // Example script handling sequential data server events (notecard reading)

string notecardNameOrKey = "name or key of the notecard goes here"; key notecardQueryId; integer notecardLine;// first notecard line is 0, so we don't have to set notecardLine = 1 here

default {

   state_entry()
   {
   //  PUBLIC_CHANNEL has the integer value 0
       llSay(PUBLIC_CHANNEL, "Reading notecard...");

       notecardQueryId = llGetNotecardLine(notecardNameOrKey, notecardLine);
   }

   dataserver(key query_id, string data)
   {
       if (query_id == notecardQueryId)
       {
           if (data == EOF)//  we have reached the EOF (end of file)
           {
               llSay(PUBLIC_CHANNEL, "No more lines in notecard, read " + (string)(notecardLine + 1) + " lines.");
           }
           else
           {
               llSay(PUBLIC_CHANNEL, "Line " + (string)(notecardLine + 1) + ": " + data);

           //  increment line index first, then read the line
               notecardQueryId = llGetNotecardLine(notecardNameOrKey, ++notecardLine);
           }
       }
   }

} </lsl> <lsl> // Example script handling multiple data server events

list events; integer stride = 3;

disable_timer() {

   llSetTimerEvent((float)FALSE);

}

default {

   touch_start(integer num_detected)
   {
       key id = llDetectedKey(0);
       events += [llRequestDisplayName(id), id, llGetUnixTime()];

       if ((events != []) && (events != []))

// {

           llSetTimerEvent(35.0);

// }

   dataserver(key request_id, string data)
   {
       integer index = llListFindList(events, [request_id]);

       if (~index & !(index % stride))
       { // index should be a key in the first stride/column
           key id = llList2Key(events, index + 1);
           llRegionSayTo(id, PUBLIC_CHANNEL, "Hello " + data + "!");

           events = llDeleteSubList((events = []) + events, index, index + (stride - 1));

           if (events == [])

// {

               disable_timer();

// }

       }
   }

   timer()
   {
       integer length = (events != []);

       if (length)
       {
           // Loop until we find a valid entry (as all entries after will be valid too)
           while(length && (llList2Integer(events, 2) < (llGetUnixTime() - 30)))
           {
               events = llDeleteSubList((events = []) + events, 0, stride - 1);
               length -= stride;
           }
       }

       if (events == [])

// {

               disable_timer();

// }

} </lsl>

Notes

Requesting data from within the dataserver event is quite valid. However, be aware that further dataserver events cannot be received until the event that sent the request has been completed.

Deep Notes

Issues

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~ Search JIRA for related Issues

		SVC-6831	A		llRequestAgentData with DATA_ONLINE parameter has a delay of up to 10 minutes in reporting offline status
		SVC-2596	A		Script dataserver events become permanently blocked until sim restart

Signature
event void dataserver( key queryid, string data );

Dataserver

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