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pyln-testing: improve wait_for a bit

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This 'fixes' the `wait_for` helper by removing a pointless final
`time.sleep()`, thus potentially making the method return quicker.

The old code could have had three final states:
 - success() := True
 - Timeout and success() := True
 - Timeout and success() := False

The new code has just two final state:
 - success() := True
 - Timeout and success() := False

It ensures the final `time.sleep()` is just the right amount before timeout.
And more importantly making it more readable :-)

Changelog-None
This commit is contained in:
Michael Schmoock 2021-02-03 12:14:38 +01:00 committed by Rusty Russell
parent 9da191e034
commit d76ca6ed35
1 changed files with 5 additions and 4 deletions
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9
contrib/pyln-testing/pyln/testing/utils.py
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@ -84,13 +84,14 @@ TIMEOUT = int(env("TIMEOUT", 180 if SLOW_MACHINE else 60))
def wait_for(success, timeout=TIMEOUT):
start_time = time.time()
interval = 0.25
while not success() and time.time() < start_time + timeout:
time.sleep(interval)
while not success():
time_left = start_time + timeout - time.time()
if time_left <= 0:
raise ValueError("Timeout while waiting for {}", success)
time.sleep(min(interval, time_left))
interval *= 2
if interval > 5:
interval = 5
if time.time() > start_time + timeout:
raise ValueError("Error waiting for {}", success)
def write_config(filename, opts, regtest_opts=None, section_name='regtest'):