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47 lines
1016 B
Nim
47 lines
1016 B
Nim
import std/tables
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import pkg/chronos
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import ../logutils
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{.push raises: [].}
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type TrackedFutures* = ref object
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futures: Table[uint, FutureBase]
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cancelling: bool
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logScope:
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topics = "trackable futures"
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proc len*(self: TrackedFutures): int =
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self.futures.len
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proc removeFuture(self: TrackedFutures, future: FutureBase) =
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if not self.cancelling and not future.isNil:
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self.futures.del(future.id)
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proc track*[T](self: TrackedFutures, fut: Future[T]) =
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if self.cancelling:
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return
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self.futures[fut.id] = FutureBase(fut)
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proc cb(udata: pointer) =
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self.removeFuture(fut)
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fut.addCallback(cb)
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proc cancelTracked*(self: TrackedFutures) {.async: (raises: []).} =
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self.cancelling = true
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trace "cancelling tracked futures"
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var cancellations: seq[FutureBase]
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for future in self.futures.values:
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if not future.isNil and not future.finished:
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cancellations.add future.cancelAndWait()
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await noCancel allFutures cancellations
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self.futures.clear()
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self.cancelling = false
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