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Last Post:
13-Oct-2008 20:03
by: stuartOS
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Posts:
32
Registered:
31/01/08
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How to detect daily tile quota exceeded
Posted:
03-Mar-2008 20:32
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I would like my site to offer an apology when its daily tile quota has been exceeded rather than just render maps with "Sorry! This map tile cannot be served at the moment" Is there any way of detecting exceeded quota or the presence of 'Sorry' tiles with script ? The tile URLs are no different to normal.
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Posts:
169
Registered:
31/01/08
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Re: How to detect daily tile quota exceeded
Posted:
11-Mar-2008 17:47
in response to: billChadwick
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Hi Bill,
There is a support service which has a function that you can call to get the current tile count and limit. This count may be a cached value, but is likely to be accurate to within a few minutes. Probably best called when the page is first loaded to check if there are any tiles left and then display some form of error message.
The callback function takes two integer parameters.
...
var supportService = new OpenSpace.SupportService();
supportService.getTileCount(tileCountResults);
...
function tileCountResults(tilesUsed, maxTiles)
{
var s = "Tiles Used: " + tilesUsed + " of " + maxTiles;
}
Regards,
Andy.
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Posts:
28
Registered:
04/02/08
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Re: How to detect daily tile quota exceeded
Posted:
12-Mar-2008 12:41
in response to: OS OpenSpace Team
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I can't work out from the example given how to use this SupportService. Anyone got it working?
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Posts:
32
Registered:
31/01/08
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Re: How to detect daily tile quota exceeded
Posted:
16-Mar-2008 16:50
in response to: hillbagging
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I have used the following code (and a bargraph) on http://wheresthepath.googlepages.com/wheresthepath.htm
supportService = new OpenSpace.SupportService();
supportService.getTileCount(function tileCountResults(tilesUsed, maxTiles)
{
if(parseFloat(tilesUsed) >= parseFloat(maxTiles)){
alert("I'm sorry, but this site will not be able to display any more OS maps today (due to an OS imposed limit of " + maxTiles + " map tile fetches per day). Please try visiting again tomorrow.");
}
});
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Posts:
28
Registered:
04/02/08
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Re: How to detect daily tile quota exceeded
Posted:
17-Mar-2008 09:48
in response to: billChadwick
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Excellent. Thanks very much Bill.
Simon
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Posts:
149
Registered:
07/02/08
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Re: How to detect daily tile quota exceeded
Posted:
31-Mar-2008 19:06
in response to: hillbagging
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Seems I am getting tilesUsed > maxTiles this PM
I've made my wheresthepath bargraph go full house blue for 'Cool' if this happens!
Has something in the Ts&Cs changed today ?
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Posts:
17
Registered:
13/03/08
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Re: How to detect daily tile quota exceeded
Posted:
02-Apr-2008 02:02
in response to: OS OpenSpace Team
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Andy, can you add something similar for the Gazetteer to the wish list, please?
Perhaps something like:
supportService.getGazetteerCount(gazSearchCount)
function gazSearchCount(gazSearchesUsed, gazMaxSearches){ }
Regds,
Bob
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Posts:
8
Registered:
15/02/08
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Re: How to detect daily tile quota exceeded
Posted:
12-Apr-2008 05:25
in response to: billChadwick
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I finally joined the "Over Quota" club this week too, and so I also have a feature request.
Is it possible to check the tiles used by source IP?
It would be nice to have a "per user, per site" quotaing system to prevent individual usage hogs from denial-of-servicing a site.
.. Gavin
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Posts:
149
Registered:
07/02/08
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Re: How to detect daily tile quota exceeded
Posted:
13-Apr-2008 20:32
in response to: brockgr
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Did you get 'Sorry' tiles ? Or did the stats just go over the top but the OS still serve you good tiles?
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Posts:
8
Registered:
15/02/08
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Posts:
149
Registered:
07/02/08
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Re: How to detect daily tile quota exceeded
Posted:
15-Apr-2008 15:51
in response to: brockgr
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Now are our quotas beeing exceeded because we have made popular sites or because someone is using our credentials (easily copied from the source of our web pages) to hoover up maptiles from OpenSpace for offline use ?
I agree with your suggestion about limiting tiles by IP Address as well as root url.
I suspect too that the OS tile server could detect obvious systematic bulk download (linearly iterating x, y coords for example).
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Posts:
4
Registered:
21/02/08
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Re: How to detect daily tile quota exceeded
Posted:
19-May-2008 16:31
in response to: billChadwick
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I can't seem to get this function to work at all on my maps. Am I missing something or getting the wrong end of the stick?
I've entered the following code
...
var supportService = new OpenSpace.SupportService();
supportService.getTileCount(tileCountResults);
...
function tileCountResults(tilesUsed, maxTiles)
{
var s = "Tiles Used: " + tilesUsed + " of " + maxTiles;
}
But it just does not work.
Any help greatly appreciated.
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Posts:
169
Registered:
31/01/08
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Re: How to detect daily tile quota exceeded
Posted:
20-May-2008 18:28
in response to: mdthomas
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It looks OK to me, what sort of error is it throwing, does the function get called at all?
Regards,
Andy.
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Posts:
4
Registered:
21/02/08
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Re: How to detect daily tile quota exceeded
Posted:
21-May-2008 20:45
in response to: OS OpenSpace Team
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When I add the script it does not show how many tiles I have left.
The below is a copy of the complete script I'm using (I've shortened the number of points on the route overlay).
<script type="text/javascript">
var osMap;
function init()
{
// Creates the map centered on OSHQ
osMap = new OpenSpace.Map('map');
osMap.setCenter(new OpenSpace.MapPoint(335999, 514699), 7);
var vectorLayer = new OpenLayers.Layer.Vector("Vector Layer");
osMap.addLayer(vectorLayer);
/*
* Define the line style
*/
var style_green =
{
strokeColor: "#66CCCC",
strokeOpacity: 0.7,
strokeWidth: 6,
pointRadius: 6,
pointerEvents: "visiblePainted"
};
// Define the line
var p1 = new OpenLayers.Geometry.Point (338138,516875);
var p2 = new OpenLayers.Geometry.Point (338208,516865);
var points = [];
points.push (p1);
points.push (p2);
// create a line feature from a list of points
var lineString = new OpenLayers.Geometry.LineString(points);
var lineFeature = new OpenLayers.Feature.Vector(lineString, null, style_green);
vectorLayer.addFeatures([lineFeature]);
}
// Call up the tiles used
var supportService = new OpenSpace.SupportService();
supportService.getTileCount(tileCountResults);
function tileCountResults(tilesUsed, maxTiles)
{
var s = "Tiles Used: " + tilesUsed + " of " + maxTiles;
}
</script>
Message was edited by: mdthomas
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Posts:
149
Registered:
07/02/08
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Re: How to detect daily tile quota exceeded
Posted:
21-May-2008 22:48
in response to: mdthomas
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Perhaps the question is very basic ...
Are you actually doing anything with the string variable s ?
You need to set it as the text on an html text element e.g
document.getElementById('myQuotaTextId').value = s;
or use
alert(s);
to issue a prompt.
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