Prefix based router support

[tschellenbach]

Routes based on the configured prefixes

Example config:

'redis': {
    'engine': 'nydus.db.backends.redis.Redis',
    'router': 'django_redis.nydus_router.PrefixPartitionRouter',
    'hosts': {
        'default': {'db': 0, 'host': 'default.redis.goteam.be', 'port': 6379},
        'user:loves:': {'db': 1, 'host': 'default.redis.goteam.be', 'port': 6379},
        'loves:': {'db': 2, 'host': 'default.redis.goteam.be', 'port': 6379},
        'hash:entity:': {'db': 0, 'host': 'entities.redis.goteam.be', 'port': 6379},
    }
}

We route to one and only one redis.
Use a seperate config if you want hashing based partitioning.

[dcramer]

This path needs updated, right?

[dcramer]

I wonder if this would be a good time to add some kind of router options to the configuration.

That could help a lot if we wanted to address #11 by not requiring the dict config approach

[Fluxx]

Perhaps I missed something, but is there a default host in your example docstring?

[Fluxx]

Nice work. Can you also add a couple more tests to test the code paths in PrefixPartitionRouter.route() that raise exceptions?

[tschellenbach]

Awesome, thanks for the very thorough feedback. Good to see such traction behind the project.

We've forked Nydus for 2 reasons.

• PrefixPartition support
• Silent failures when using redis as a cache.

Both features are unit tested and included in the pull request.
Hope you guys like the suggestions.