mirror of
https://github.com/status-im/nim-chronos.git
synced 2025-01-20 16:29:12 +00:00
4abd7a5645
* exception tracking This PR adds minimal exception tracking to chronos, moving the goalpost one step further. In particular, it becomes invalid to raise exceptions from `callSoon` callbacks: this is critical for writing correct error handling because there's no reasonable way that a user of chronos can possibly _reason_ about exceptions coming out of there: the event loop will be in an indeterminite state when the loop is executing an _random_ callback. As expected, there are several issues in the error handling of chronos: in particular, it will end up in an inconsistent internal state whenever the selector loop operations fail, because the internal state update functions are not written in an exception-safe way. This PR turns this into a Defect, which probably is not the optimal way of handling things - expect more work to be done here. Some API have no way of reporting back errors to callers - for example, when something fails in the accept loop, there's not much it can do, and no way to report it back to the user of the API - this has been fixed with the new accept flow - the old one should be deprecated. Finally, there is information loss in the API: in composite operations like `poll` and `waitFor` there's no way to differentiate internal errors from user-level errors originating from callbacks. * store `CatchableError` in future * annotate proc's with correct raises information * `selectors2` to avoid non-CatchableError IOSelectorsException * `$` should never raise * remove unnecessary gcsafe annotations * fix exceptions leaking out of timer waits * fix some imports * functions must signal raising the union of all exceptions across all platforms to enable cross-platform code * switch to unittest2 * add `selectors2` which supercedes the std library version and fixes several exception handling issues in there * fixes * docs, platform-independent eh specifiers for some functions * add feature flag for strict exception mode also bump version to 3.0.0 - _most_ existing code should be compatible with this version of exception handling but some things might need fixing - callbacks, existing raises specifications etc. * fix AsyncCheck for non-void T
83 lines
1.9 KiB
Nim
83 lines
1.9 KiB
Nim
# Chronos Test Suite
|
|
# (c) Copyright 2018-Present
|
|
# Status Research & Development GmbH
|
|
#
|
|
# Licensed under either of
|
|
# Apache License, version 2.0, (LICENSE-APACHEv2)
|
|
# MIT license (LICENSE-MIT)
|
|
import unittest2
|
|
import ../chronos
|
|
|
|
when defined(nimHasUsed): {.used.}
|
|
|
|
proc asyncRetValue(n: int): Future[int] {.async.} =
|
|
await sleepAsync(n.milliseconds)
|
|
result = n * 10
|
|
|
|
proc asyncRetVoid(n: int) {.async.} =
|
|
await sleepAsync(n.milliseconds)
|
|
|
|
proc asyncRetExceptionValue(n: int): Future[int] {.async.} =
|
|
await sleepAsync(n.milliseconds)
|
|
result = n * 10
|
|
if true:
|
|
raise newException(ValueError, "Test exception")
|
|
|
|
proc asyncRetExceptionVoid(n: int) {.async.} =
|
|
await sleepAsync(n.milliseconds)
|
|
if true:
|
|
raise newException(ValueError, "Test exception")
|
|
|
|
proc testAwait(): Future[bool] {.async.} =
|
|
var res: int
|
|
await asyncRetVoid(100)
|
|
res = await asyncRetValue(100)
|
|
if res != 1000:
|
|
return false
|
|
if (await asyncRetValue(100)) != 1000:
|
|
return false
|
|
try:
|
|
await asyncRetExceptionVoid(100)
|
|
return false
|
|
except ValueError:
|
|
discard
|
|
res = 0
|
|
try:
|
|
discard await asyncRetExceptionValue(100)
|
|
return false
|
|
except ValueError:
|
|
discard
|
|
if res != 0:
|
|
return false
|
|
return true
|
|
|
|
proc testAwaitne(): Future[bool] {.async.} =
|
|
var res1: Future[void]
|
|
var res2: Future[int]
|
|
|
|
res1 = awaitne asyncRetVoid(100)
|
|
res2 = awaitne asyncRetValue(100)
|
|
if res1.failed():
|
|
return false
|
|
if res2.read() != 1000:
|
|
return false
|
|
|
|
res1 = awaitne asyncRetExceptionVoid(100)
|
|
if not(res1.failed()):
|
|
return false
|
|
|
|
res2 = awaitne asyncRetExceptionValue(100)
|
|
try:
|
|
discard res2.read()
|
|
return false
|
|
except ValueError:
|
|
discard
|
|
|
|
return true
|
|
|
|
suite "Macro transformations test suite":
|
|
test "`await` command test":
|
|
check waitFor(testAwait()) == true
|
|
test "`awaitne` command test":
|
|
check waitFor(testAwaitne()) == true
|