mirror of
https://github.com/status-im/nim-codex.git
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da234d503b
- removes usage of `then`, simplifying the logic, and allowing `then` to be removed completely - updates annotations to reflect that all procs (sync and async) raise no exceptions
55 lines
1.3 KiB
Nim
55 lines
1.3 KiB
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
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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 = 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]): Future[T] =
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if self.cancelling:
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return fut
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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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return fut
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proc track*[T, U](future: Future[T], self: U): Future[T] =
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## Convenience method that allows chaining future, eg:
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## `await someFut().track(sales)`, where `sales` has declared a
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## `trackedFutures` property.
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self.trackedFutures.track(future)
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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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