using postgresql 9 replication but want to balance to servers online only

Hi,

I've got a master and slave database setup working using Postgresql 9
Replication. I followed this guide quite strongly
http://brandonkonkle.com/blog/2010/oct/20/postgres-9-streaming-replication-and-django-balanc/

When the master is updated then the slave replicates the changes. The
requests are being balanced randomly using django-balancer.

The problem I'm having now is that I want to check if the database
server is online before it's eligible to be used. If I take down my
master the requests should still be pushed to the slave machine always
until the master is back online, even if it's only in read-only.

Any ideas or suggestions greatly appreciated.

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