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TileCache Caches
================
TileCache offers access to a number of different caches. These caches are used
to store tiles.
Disk
----
Example Configuration::
[cache]
type=Disk
base=/var/lib/tilecache
umask=002
sendfile=yes
expire=3600
Dependencies: None
The sendfile=yes option instructs TileCache to send an X-SendFile header to
the web server rather than the contents of the image.
See http://blog.lighttpd.net/articles/2006/07/02/x-sendfile and
http://tn123.ath.cx/mod_xsendfile/
GoogleDisk
----
Example Configuration::
[cache]
type=GoogleDisk
base=/var/lib/tilecache
Dependencies: None
Note: A simple subclass of the Disk cache, this switches the Y tile ordering
on the disk, so Google Maps users can easily access tiles directly (e.g.
bypassing tilecache.py, if all tiles have been pre-rendered) with a simple
CustomTileUrl function.
Memcached
---------
Example configuration::
[cache]
type=Memcached
servers=127.0.0.1:11211
Dependencies:
* memcache Python module must be installed on your system path.
http://code.sixapart.com/svn/memcached/trunk/api/python/memcache.py
Amazon S3
---------
Example configuration::
[cache]
type=AWSS3
access_key=833833ABC88838
secret_access_key=8234abyi3kdjby8so8idu
use_tms_paths=true
The use_tms_paths will make the files more accessible to other clients,
though at this time, ACLs are not set on the TMS structure to make them
available publicly.
The use_tms_paths can also be set to "flipped": if so, it will result in
'flipped' TMS, with typical paths like:
/1.0.0/9/82/63.png
But with 0 starting at the top of the map, instead of the bottom.
This cache can use one of two libraries:
Boto
____
Available from http://code.google.com/p/boto/, boto is a package that
wraps the Amazon APIs in a Pythonic wrapper. This is installable on
recent Debian-based distributions as python-boto. It can be installed
via easy_install from setuptools as well: simply easy_install boto.
The boto library is more complete, and is more likely to properly
handle error conditions than the Amazon Example Library.
Amazon Example Library
______________________
Amazon provides an example Python library. This library provides a simple
wrapper around the Amazon web services. The code is available from
http://developer.amazonwebservices.com/connect/entry.jspa?externalID=134&categoryID=47
You must download, unpack, and place the s3-example-libraries/python/S3.py
file on your PYTHONPATH/sys.path. The source distribution of TileCache
includes this file in the TileCache/Caches/S3.py file. (Packagers are
encouraged to remove this file from distributions and instead depend
on the boto library described above.)
MBTiles
-------
Simple read-only format for MBTiles sqlite databases. Name each database
according to the name of the layer, and place it inside your cache directory,
and provide an extension to your cache.
[cache]
type=MBTiles
base=./tiles
ext=db
For layer basic, this will attempt to open a sqlite3 database at
./tiles/basic.db .
See http://mapbox.com/tools/mbtiles for more details.
All Caches
----------
All Caches support the expire option.
The expire=n option instructs TileCache to send an Expires header, with the
date set 'n' seconds into the future.
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