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https://github.com/status-im/nim-chronos.git
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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
87 lines
2.1 KiB
Nim
87 lines
2.1 KiB
Nim
# Chronos Test Suite
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# (c) Copyright 2020-Present
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# Status Research & Development GmbH
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#
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# Licensed under either of
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# Apache License, version 2.0, (LICENSE-APACHEv2)
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# MIT license (LICENSE-MIT)
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import unittest2
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import ../chronos
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when defined(nimHasUsed): {.used.}
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suite "Asynchronous utilities test suite":
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when defined(chronosFutureTracking):
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proc getCount(): int =
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# This procedure counts number of Future[T] in double-linked list via list
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# iteration.
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result = 0
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for item in pendingFutures():
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inc(result)
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test "Future clean and leaks test":
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when defined(chronosFutureTracking):
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if pendingFuturesCount(WithoutFinished) == 0:
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if pendingFuturesCount(OnlyFinished) > 0:
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poll()
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check pendingFuturesCount() == 0
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else:
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echo dumpPendingFutures()
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check false
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else:
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skip()
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test "FutureList basics test":
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when defined(chronosFutureTracking):
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var fut1 = newFuture[void]()
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check:
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getCount() == 1
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pendingFuturesCount() == 1
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var fut2 = newFuture[void]()
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check:
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getCount() == 2
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pendingFuturesCount() == 2
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var fut3 = newFuture[void]()
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check:
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getCount() == 3
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pendingFuturesCount() == 3
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fut1.complete()
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poll()
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check:
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getCount() == 2
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pendingFuturesCount() == 2
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fut2.fail(newException(ValueError, ""))
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poll()
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check:
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getCount() == 1
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pendingFuturesCount() == 1
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fut3.cancel()
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poll()
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check:
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getCount() == 0
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pendingFuturesCount() == 0
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else:
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skip()
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test "FutureList async procedure test":
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when defined(chronosFutureTracking):
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proc simpleProc() {.async.} =
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await sleepAsync(10.milliseconds)
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var fut = simpleProc()
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check:
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getCount() == 2
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pendingFuturesCount() == 2
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waitFor fut
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check:
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getCount() == 1
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pendingFuturesCount() == 1
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poll()
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check:
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getCount() == 0
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pendingFuturesCount() == 0
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else:
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skip()
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