// Returns a client back to the pool. If the pool is full the client is closed
// instead. If the client is already closed (due to connection failure or
// what-have-you) it should not be put back in the pool. The pool will create
// more connections as needed.
func (p *Pool) Put(conn *redis.Client) {
select {
case p.pool <- conn:
default:
conn.Close()
}
}
// Removes and calls Close() on all the connections currently in the pool.
// Assuming there are no other connections waiting to be Put back this method
// effectively closes and cleans up the pool.
func (p *Pool) Empty() {
var conn *redis.Client
for {
select {
case conn = <-p.pool:
conn.Close()
default:
return
}
}
}
// A useful helper method which acts as a wrapper around Put. It will only
// actually Put the conn back if potentialErr is not an error or is a
// redis.CmdError. It would be used like the following:
//
// func doSomeThings(p *Pool) error {
// conn, redisErr := p.Get()
// if redisErr != nil {
// return redisErr
// }
// defer p.CarefullyPut(conn, &redisErr)
//
// var i int
// i, redisErr = conn.Cmd("GET", "foo").Int()
// if redisErr != nil {
// return redisErr
// }
//
// redisErr = conn.Cmd("SET", "foo", i * 3).Err
// return redisErr
// }
//
// If we were just using the normal Put we wouldn't be able to defer it because
// we don't want to Put back a connection which is broken. This method takes
// care of doing that check so we can still use the convenient defer
func (p *Pool) CarefullyPut(conn *redis.Client, potentialErr *error) {
if potentialErr != nil && *potentialErr != nil {
// We don't care about command errors, they don't indicate anything
// about the connection integrity
if _, ok := (*potentialErr).(*redis.CmdError); !ok {
conn.Close()
return
}
}
p.Put(conn)
}
