LSL HTTP server/examples
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Hello World!
Classic example, the smallest http_request script possible. <lsl> default {
state_entry()
{
llRequestURL();
}
http_request(key id, string method, string body)
{
if (method == URL_REQUEST_GRANTED)
{
llSay(0,"URL: " + body);
}
else if (method == "GET")
{
llHTTPResponse(id,200,"Hello World!");
}
}
} </lsl> A slightly more robust version: <lsl> default {
state_entry()
{
llRequestURL();
}
http_request(key id, string method, string body)
{
if (method == URL_REQUEST_GRANTED)
{
llSay(0,"URL: " + body);
}
else if (method == URL_REQUEST_DENIED)
{
llSay(0, "Something went wrong, no url. " + body);
}
else if (method == "GET")
{
llHTTPResponse(id,200,"Hello World!");
}
else
{
llHTTPResponse(id,405,"Unsupported Method");
}
}
} </lsl>
Visitor List
A list of residents within sensor range of the server.
Notes:
- This includes a method for handling multiple requests while waiting for asynchronous data requests to come back.
<lsl>integer scanning = FALSE;
list requests;
send_response(string body) {
integer j;
for (j = 0; j < llGetListLength(requests); ++j)
{
llHTTPResponse(llList2Key(requests,j), 200, body);
}
requests = [];
}
default {
state_entry()
{
llRequestURL();
}
http_request(key id, string method, string body)
{
if (method == URL_REQUEST_GRANTED)
{
llSay(0,"URL: " + body);
}
else if (method == URL_REQUEST_DENIED)
{
llSay(0, "Something went wrong, no url. " + body);
}
else if (method == "GET")
{
if (!scanning)
{
llSensor("",NULL_KEY,AGENT,96,PI);
scanning = TRUE;
}
requests += [id];
}
else
{
llHTTPResponse(id,405,"Unsupported method.");
}
}
no_sensor()
{
send_response("There is no one here.");
scanning = FALSE;
}
sensor(integer n)
{
string output;
if (n < 16) output = "There are " + (string)n + " avatars nearby:";
else output = "There are at least 16 avatars nearby:";
integer i;
for (i = 0;i<n;++i)
{
output += "\n\t" + llDetectedName(i);
}
send_response(output);
scanning = FALSE; }
} </lsl>
Url Persistence / Visitor Counter
A more complete 'hello world', always has an url and keeps a visitor counter. <lsl> string url; integer hits;
setup() {
llSetObjectName("HTTP Server");
url = "";
llRequestURL();
hits = (integer)llGetObjectDesc();
llSetText((string)hits + " visitors.",<1,1,0>,1);
}
default {
state_entry() { setup(); }
on_rez(integer n) { setup(); }
changed(integer c)
{
if (c & (CHANGED_REGION | CHANGED_REGION_START | CHANGED_TELEPORT) )
{
setup();
}
}
touch_start(integer n)
{
llSay(0,"My url is: " + url);
}
http_request(key id, string method, string body)
{
if (method == URL_REQUEST_GRANTED)
{
url = body;
}
else if (method == URL_REQUEST_DENIED)
{
llSay(0, "Something went wrong, no url. " + body);
}
else if (method == "GET")
{
++hits;
llSetObjectDesc((string)hits);
llSetText((string)hits + " visitors.",<1,1,0>,1);
llHTTPResponse(id,200,"Hello! You are visitor " + (string)hits + ".");
}
else
{
llHTTPResponse(id,405,"Method unsupported");
}
}
} </lsl>
Perl Example Using POST
Here are a pair of scripts to provide another example. The first script is the LSL code to receive the information on the grid. The second script is a PERL script that is used on the outside server to contact the code on the grid. <lsl>
key requestURL;
default {
state_entry() {
requestURL = llRequestURL(); // Request that an URL be assigned to me.
}
http_request(key id, string method, string body) {
if ((method == URL_REQUEST_GRANTED) && (id == requestURL) ){
// An URL has been assigned to me.
llOwnerSay("Obtained URL: " + body);
requestURL = NULL_KEY;
}
else if ((method == URL_REQUEST_DENIED) && (id == requestURL)) {
// I could not obtain a URL
llOwnerSay("There was a problem, and an URL was not assigned: " + body);
requestURL = NULL_KEY;
}
else if (method == "POST") {
// An incoming message was received.
llOwnerSay("Received information from the outside: " + body);
llHTTPResponse(id,200,"Thank you for calling. All of our operators are busy.");
}
else {
// An incoming message has come in using a method that has not been anticipated.
llHTTPResponse(id,405,"Unsupported Method");
}
}
}
</lsl>
<lsl>
- !/usr/bin/perl
- Routine to contact a script on the SL Grid using http server
use URI; use LWP; require HTTP::Request; use strict;
- Set the URL manually....
my $url = 'http://sim3015.aditi.lindenlab.com:12046/cap/2e83b2ce-65aa-9c44-5d1c-e64f48a222e2';
- #################################################
- Routine to send the information to the prim
- submitInformation($url,$information)
sub submitInformation{
# First get the arguments. my $url = shift; my $information = shift;
# Create the objects to be used to send out the HTTP request my $browser = LWP::UserAgent->new; my $request = HTTP::Request->new(POST => $url);
# Set the encoding method and specify the information to be sent.
$request->content_type('application/x-www-form-urlencoded');
$request->content($information);
# Send the request. my $response = $browser->request($request);
# Return the information sent back return($response->content);
}
my $info = submitInformation
($url,'id=244195d6-c9b7-4fd6-9229-c3a8b2e60e81&name=M Linden');
print $info,"\n";
</lsl>