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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
89 lines
2.6 KiB
Nim
89 lines
2.6 KiB
Nim
# Chronos Test Suite
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# (c) Copyright 2018-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 std/os
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import unittest2
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import ../chronos, ../chronos/timer
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when defined(nimHasUsed): {.used.}
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suite "Asynchronous timers & steps test suite":
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const TimersCount = 10
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proc timeWorker(time: Duration): Future[Duration] {.async.} =
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var st = Moment.now()
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await sleepAsync(time)
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var et = Moment.now()
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result = et - st
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proc waitAll[T](futs: seq[Future[T]]): Future[void] =
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var counter = len(futs)
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var retFuture = newFuture[void]("waitAll")
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proc cb(udata: pointer) =
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dec(counter)
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if counter == 0:
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retFuture.complete()
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for fut in futs:
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fut.addCallback(cb)
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return retFuture
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proc test(timeout: Duration): Future[Duration] {.async.} =
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var workers = newSeq[Future[Duration]](TimersCount)
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for i in 0..<TimersCount:
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workers[i] = timeWorker(timeout)
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await waitAll(workers)
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var sum: Duration
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for i in 0..<TimersCount:
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var time = workers[i].read()
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sum = sum + time
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result = sum div 10'i64
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proc testTimer(): bool =
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let a = Moment.now()
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waitFor(sleepAsync(1000.milliseconds))
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let b = Moment.now()
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let d = b - a
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result = (d >= 1000.milliseconds) and (d <= 3000.milliseconds)
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if not result:
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echo d
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test "Timer reliability test [" & asyncTimer & "]":
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check testTimer() == true
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test $TimersCount & " timers with 10ms timeout":
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var res = waitFor(test(10.milliseconds))
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check (res >= 10.milliseconds) and (res <= 100.milliseconds)
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test $TimersCount & " timers with 100ms timeout":
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var res = waitFor(test(100.milliseconds))
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check (res >= 100.milliseconds) and (res <= 1000.milliseconds)
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test $TimersCount & " timers with 1000ms timeout":
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var res = waitFor(test(1000.milliseconds))
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check (res >= 1000.milliseconds) and (res <= 5000.milliseconds)
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test "Asynchronous steps test":
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var futn1 = stepsAsync(-1)
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var fut0 = stepsAsync(0)
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var fut1 = stepsAsync(1)
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var fut2 = stepsAsync(2)
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var fut3 = stepsAsync(3)
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check:
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futn1.completed() == true
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fut0.completed() == true
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fut1.completed() == false
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fut2.completed() == false
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fut3.completed() == false
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poll()
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check:
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fut1.completed() == true
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fut2.completed() == false
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fut3.completed() == false
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poll()
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check:
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fut2.completed() == true
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fut3.completed() == false
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poll()
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check:
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fut3.completed() == true
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