Hi,
I have an app using AR that is threaded, and accesses multiple
databases.
Sometimes I get MySQL server has gone away errors if a connection
timed out due to a long period of inactivity.
So I would wish to verify the connections before using them.
Using verify_active_connections! is not possible, it is not thread
safe. (In particular for Mysql it sends a stat request to every
connection, which resets affected_rows, thus breaking optimistic
locking which checks this.)
The problem is, there is not really an API for verify the current
connections that a thread has.
The best I can do is this ugly line:
ActiveRecord::Base.connection_handler.connection_pools.each_value {|
pool| pool.connection.verify!}
But this isn't ideal as this code will checkout a connection for
*every* database in use, rather than just verify the ones that a
particular thread is using (the ones that it already has checked out).
I suppose we could just check in all the thread's connections with
clear_active_connections! so that they are verified on checkout then
next time they are used. This seems clumsy though.
Could there be added a new method that does what I want? I could
provide a patch if needed.
eg.
ActiveRecord::Base.verify_current_connections!
- Stephen
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