@dom96 Thanks. The code seems works, but it doesn't. db.close() seems executed
before the code 'block', this is the error message:
asyncdispatch.nim(1492) waitFor
asyncdispatch.nim(1496) poll
asyncdispatch.nim(292) runOnce
Error: unhandled exception: No handles or timers registered in dispatcher.
[ValueError]
So I must use the following code:
template withDb(body: untyped) =
let dbFut = open(...)
yield dbFut
let db = dbFut.read()
block:
body
close(db)
But the code above cannot deal with the exception raised from 'body', the code
'body' raise a exception, close(db) will not be executed. I cannot use
try...finally either, the compiler will not pass.
So there is a really big problem, how to close the resource reliablely within a
async proc?
