mirror of
https://github.com/logos-storage/logos-storage-nim.git
synced 2026-01-02 21:43:11 +00:00
748830570a
* checked exceptions in stores
* makes asynciter as much exception safe as it gets
* introduce "SafeAsyncIter" that uses Results and limits exceptions to cancellations
* adds {.push raises: [].} to errors
* uses SafeAsyncIter in "listBlocks" and in "getBlockExpirations"
* simplifies safeasynciter (magic of auto)
* gets rid of ugly casts
* tiny fix in hte way we create raising futures in tests of safeasynciter
* Removes two more casts caused by using checked exceptions
* adds an extended explanation of one more complex SafeAsyncIter test
* adds missing "finishOnErr" param in slice constructor of SafeAsyncIter
* better fix for "Error: Exception can raise an unlisted exception: Exception" error.
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Co-authored-by: Dmitriy Ryajov <dryajov@gmail.com>
54 lines
1.5 KiB
Nim
54 lines
1.5 KiB
Nim
## Nim-Codex
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## Copyright (c) 2023 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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## Timer
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## Used to execute a callback in a loop
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{.push raises: [].}
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import pkg/chronos
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import ../logutils
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type
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TimerCallback* = proc(): Future[void] {.gcsafe, async: (raises: []).}
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Timer* = ref object of RootObj
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callback: TimerCallback
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interval: Duration
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name: string
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loopFuture: Future[void]
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proc new*(T: type Timer, timerName = "Unnamed Timer"): Timer =
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## Create a new Timer intance with the given name
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Timer(name: timerName)
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proc timerLoop(timer: Timer) {.async: (raises: []).} =
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try:
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while true:
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await timer.callback()
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await sleepAsync(timer.interval)
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except CancelledError:
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discard # do not propagate as timerLoop is asyncSpawned
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method start*(
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timer: Timer, callback: TimerCallback, interval: Duration
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) {.gcsafe, base.} =
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if timer.loopFuture != nil:
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return
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trace "Timer starting: ", name = timer.name
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timer.callback = callback
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timer.interval = interval
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timer.loopFuture = timerLoop(timer)
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method stop*(timer: Timer) {.base, async: (raises: []).} =
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if timer.loopFuture != nil and not timer.loopFuture.finished:
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trace "Timer stopping: ", name = timer.name
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await timer.loopFuture.cancelAndWait()
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timer.loopFuture = nil
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