Fix withdraw increment - Githubissues

Summary

Make sure that increment is called sync for the same withdraw link.

The checking logic has been extracted to _check_withdraw_link. The _check_withdraw_link_safe function makes sure that for one particular withdraw link the check&increment is not atomic.

The NamedLock class holds a dictionary of CounterLocks. When there is now waiter for a lock then the entry is removed from the dictionary.

Note:

do not make an HTTP call to the LNbits own API while inside Lock.acquire(). It can lead to a deadlock.

lnbits / withdraw

Fix withdraw increment #26

Summary