[Tilecache] locating bad tiles...

[Tim Schaub]

John Cole wrote:
> I have a few tiles that apparently have bad image files behind them (TC
> returns very slowly, and the tiles show up white instead of pink). It would
> be nice to be able to set an option in the config file to overlay the
> filename of the tile somehow so I can find the few, seemingly random tiles
> and remove them, without deleting the entire zoom level.

See attached (quick hack) TileUtil.py.

If you can right-click a tile to get the URL, you can

TileUtil.forceRefresh(url)

to trash the bad one and request a new one.

Tim


> 
> With the addition of the watermarking feature, could it also do this?
> 
> Thanks,
> 
> John
> 
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-------------- next part --------------
import TileCache
import cgi
import os

def getServiceLayerTileBounds(url):
    """Return layer, tile, and bounds given the url."""
    
    bounds = None
    if url.find('?') != -1:
        queryDict = cgi.parse_qs(url.split('?')[1])
        queryDict = dict([(k.upper(), v) for (k, v) in queryDict.iteritems()])
        bounds = [float(i) for i in queryDict['BBOX'][0].split(',')]
        layerName = queryDict['LAYERS'][0]

    cfgfiles = TileCache.cfgfiles
    service = TileCache.Service.load(*cfgfiles)
    layer = service.layers[layerName]
    tile = layer.getTile(bounds)
    return service, layer, tile, bounds
    
def getTilePath(url):
    """Return the disk based tile path for the tile represented by the url."""
    
    service, layer, tile, bounds = getServiceLayerTileBounds(url)
    return service.cache.getKey(tile)

def forceRefresh(url):
    """Delete the disk based tile and request another one given the url."""
    
    service, layer, tile, bounds = getServiceLayerTileBounds(url)
    path = service.cache.getKey(tile)
    os.unlink(path)
    data = layer.render(tile)
    service.cache.set(tile, data)