[mapserver-users] MapCache: returning blank tiles when outside restricted extents?

[thomas bonfort]

If your <tileset> does not contain a <source> element, then it is
considered read only and the caches will never be updated. In that
sense you would have a slightly different mapcache.xml file for your
seeder than for your webserver.
As for returning blank tiles, you have the <errors> directive that
does that (set it to empty_img)

--
thomas

On Tue, Feb 7, 2012 at 08:55, John Taranu
<jtaranu at firstbasesolutions.com> wrote:
> We're having some problems with MapCache with a fully-seeded cache covering
> a small geographic extent.
>
> If the tileset definition doesn't have a restricted_extent, then any
> requests outside the cache extents are supposed to return blank tiles, and
> those blank tiles are being saved to the cache directory structure as
> symlinks.  I want to avoid that, for two reasons:
>   1. There will be lots of requests outside the cache extent, and I want to
> avoid creating hundreds of thousands of symlinks (and empty directories)
>   2. The cache was originally seeded as user "root", but the MapCache web
> service runs as another user (either "apache" or the nginx user), and that
> user cannot write to the cache directory.
>
> If instead I set the grid (inside the tileset definition) to have a
> restricted_extent,  then any requests outside the cache extents throw an
> error.
>
> Is there some way force MapCache to return a blank tile for requests outside
> the restricted_extent, without saving that tile into the cache?
>
> ---------------------------------------
> John Taranu
> Senior Web Developer
> First Base Solutions Inc
> email: jtaranu at firstbasesolutions.com
> web: firstbasesolutions.com
>
>
>
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