refactor(then): removes then util (#1047)
- removes then util as it is no longer being used in the codebase
This commit is contained in:
Eric
GitHub
parent
bef1160799
commit
f0f04ddf1d
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@ -2,7 +2,6 @@ import std/sugar
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import pkg/questionable
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import pkg/chronos
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import ../logutils
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import ./then
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import ./trackedfutures
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{.push raises:[].}
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@ -1,207 +0,0 @@
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import pkg/chronos
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import pkg/questionable
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import pkg/questionable/results
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import pkg/upraises
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# Similar to JavaScript's Promise API, `.then` and `.catch` can be used to
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# handle results and errors of async `Futures` within a synchronous closure.
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# They can be used as an alternative to `asyncSpawn` which does not return a
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# value and will raise a `FutureDefect` if there are unhandled errors
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# encountered. Both `.then` and `.catch` act as callbacks that do not block the
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# synchronous closure's flow.
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# `.then` is called when the `Future` is successfully completed and can be
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# chained as many times as desired, calling each `.then` callback in order. When
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# the `Future` returns `Result[T, ref CatchableError]` (or `?!T`), the value
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# called in the `.then` callback will be unpacked from the `Result` as a
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# convenience. In other words, for `Future[?!T]`, the `.then` callback will take
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# a single parameter `T`. See `tests/utils/testthen.nim` for more examples. To
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# allow for chaining, `.then` returns its future. If the future is already
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# complete, the `.then` callback will be executed immediately.
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# `.catch` is called when the `Future` fails. In the case when the `Future`
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# returns a `Result[T, ref CatchableError` (or `?!T`), `.catch` will be called
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# if the `Result` contains an error. If the `Future` is already failed (or
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# `Future[?!T]` contains an error), the `.catch` callback will be executed
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# immediately.
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# `.cancelled` is called when the `Future` is cancelled. If the `Future` is
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# already cancelled, the `.cancelled` callback will be executed immediately.
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# More info on JavaScript's Promise API can be found at:
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# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise
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runnableExamples:
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proc asyncProc(): Future[int] {.async.} =
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await sleepAsync(1.millis)
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return 1
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asyncProc()
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.then(proc(i: int) = echo "returned ", i)
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.catch(proc(e: ref CatchableError) = doAssert false, "will not be triggered")
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# outputs "returned 1"
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proc asyncProcWithError(): Future[int] {.async.} =
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await sleepAsync(1.millis)
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raise newException(ValueError, "some error")
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asyncProcWithError()
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.then(proc(i: int) = doAssert false, "will not be triggered")
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.catch(proc(e: ref CatchableError) = echo "errored: ", e.msg)
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# outputs "errored: some error"
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type
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OnSuccess*[T] = proc(val: T) {.gcsafe, upraises: [].}
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OnError* = proc(err: ref CatchableError) {.gcsafe, upraises: [].}
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OnCancelled* = proc() {.gcsafe, upraises: [].}
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proc ignoreError(err: ref CatchableError) = discard
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proc ignoreCancelled() = discard
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template handleFinished(future: FutureBase,
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onError: OnError,
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onCancelled: OnCancelled) =
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if not future.finished:
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return
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if future.cancelled:
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onCancelled()
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return
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if future.failed:
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onError(future.error)
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return
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proc then*(future: Future[void], onSuccess: OnSuccess[void]): Future[void] =
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proc cb(udata: pointer) =
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future.handleFinished(ignoreError, ignoreCancelled)
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onSuccess()
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proc cancellation(udata: pointer) =
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if not future.finished():
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future.removeCallback(cb)
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future.addCallback(cb)
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future.cancelCallback = cancellation
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return future
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proc then*[T](future: Future[T], onSuccess: OnSuccess[T]): Future[T] =
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proc cb(udata: pointer) =
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future.handleFinished(ignoreError, ignoreCancelled)
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if val =? future.read.catch:
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onSuccess(val)
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proc cancellation(udata: pointer) =
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if not future.finished():
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future.removeCallback(cb)
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future.addCallback(cb)
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future.cancelCallback = cancellation
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return future
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proc then*[T](future: Future[?!T], onSuccess: OnSuccess[T]): Future[?!T] =
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proc cb(udata: pointer) =
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future.handleFinished(ignoreError, ignoreCancelled)
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try:
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if val =? future.read:
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onSuccess(val)
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except CatchableError as e:
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ignoreError(e)
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proc cancellation(udata: pointer) =
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if not future.finished():
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future.removeCallback(cb)
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future.addCallback(cb)
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future.cancelCallback = cancellation
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return future
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proc then*(future: Future[?!void], onSuccess: OnSuccess[void]): Future[?!void] =
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proc cb(udata: pointer) =
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future.handleFinished(ignoreError, ignoreCancelled)
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try:
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if future.read.isOk:
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onSuccess()
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except CatchableError as e:
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ignoreError(e)
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return
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proc cancellation(udata: pointer) =
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if not future.finished():
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future.removeCallback(cb)
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future.addCallback(cb)
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future.cancelCallback = cancellation
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return future
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proc catch*[T](future: Future[T], onError: OnError) =
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if future.isNil: return
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proc cb(udata: pointer) =
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future.handleFinished(onError, ignoreCancelled)
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proc cancellation(udata: pointer) =
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if not future.finished():
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future.removeCallback(cb)
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future.addCallback(cb)
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future.cancelCallback = cancellation
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proc catch*[T](future: Future[?!T], onError: OnError) =
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if future.isNil: return
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proc cb(udata: pointer) =
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future.handleFinished(onError, ignoreCancelled)
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try:
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if err =? future.read.errorOption:
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onError(err)
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except CatchableError as e:
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onError(e)
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proc cancellation(udata: pointer) =
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if not future.finished():
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future.removeCallback(cb)
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future.addCallback(cb)
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future.cancelCallback = cancellation
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proc cancelled*[T](future: Future[T], onCancelled: OnCancelled): Future[T] =
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proc cb(udata: pointer) =
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future.handleFinished(ignoreError, onCancelled)
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proc cancellation(udata: pointer) =
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if not future.finished():
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future.removeCallback(cb)
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onCancelled()
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future.addCallback(cb)
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future.cancelCallback = cancellation
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return future
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proc cancelled*[T](future: Future[?!T], onCancelled: OnCancelled): Future[?!T] =
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proc cb(udata: pointer) =
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future.handleFinished(ignoreError, onCancelled)
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proc cancellation(udata: pointer) =
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if not future.finished():
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future.removeCallback(cb)
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onCancelled()
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future.addCallback(cb)
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future.cancelCallback = cancellation
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return future
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@ -3,7 +3,6 @@ import ./utils/testkeyutils
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import ./utils/testasyncstatemachine
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import ./utils/testasynciter
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import ./utils/testtimer
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import ./utils/testthen
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import ./utils/testtrackedfutures
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{.warning[UnusedImport]: off.}
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@ -1,414 +0,0 @@
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import pkg/chronos
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import pkg/questionable
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import pkg/questionable/results
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import codex/utils/then
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import ../../asynctest
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import ../helpers
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proc newError(): ref CatchableError =
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(ref CatchableError)(msg: "some error")
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asyncchecksuite "then - Future[void]":
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var error = newError()
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var future: Future[void]
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setup:
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future = newFuture[void]("test void")
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teardown:
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if not future.finished:
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raiseAssert "test should finish future"
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test "then callback is fired when future is already finished":
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var firedImmediately = false
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future.complete()
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discard future.then(proc() = firedImmediately = true)
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check eventually firedImmediately
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test "then callback is fired after future is finished":
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var fired = false
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discard future.then(proc() = fired = true)
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future.complete()
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check eventually fired
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test "catch callback is fired when future is already failed":
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var actual: ref CatchableError
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future.fail(error)
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future.catch(proc(err: ref CatchableError) = actual = err)
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check eventually actual == error
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test "catch callback is fired after future is failed":
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var actual: ref CatchableError
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future.catch(proc(err: ref CatchableError) = actual = err)
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future.fail(error)
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check eventually actual == error
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test "cancelled callback is fired when future is already cancelled":
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var fired = false
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await future.cancelAndWait()
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discard future.cancelled(proc() = fired = true)
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check eventually fired
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test "cancelled callback is fired after future is cancelled":
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var fired = false
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discard future.cancelled(proc() = fired = true)
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await future.cancelAndWait()
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check eventually fired
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test "does not fire other callbacks when successful":
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var onSuccessCalled = false
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var onCancelledCalled = false
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var onCatchCalled = false
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future
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.then(proc() = onSuccessCalled = true)
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.cancelled(proc() = onCancelledCalled = true)
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.catch(proc(e: ref CatchableError) = onCatchCalled = true)
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future.complete()
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check eventually onSuccessCalled
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check always (not onCancelledCalled and not onCatchCalled)
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test "does not fire other callbacks when fails":
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var onSuccessCalled = false
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var onCancelledCalled = false
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var onCatchCalled = false
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future
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.then(proc() = onSuccessCalled = true)
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.cancelled(proc() = onCancelledCalled = true)
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.catch(proc(e: ref CatchableError) = onCatchCalled = true)
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future.fail(error)
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check eventually onCatchCalled
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check always (not onCancelledCalled and not onSuccessCalled)
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test "does not fire other callbacks when cancelled":
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var onSuccessCalled = false
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var onCancelledCalled = false
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var onCatchCalled = false
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future
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.then(proc() = onSuccessCalled = true)
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.cancelled(proc() = onCancelledCalled = true)
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.catch(proc(e: ref CatchableError) = onCatchCalled = true)
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await future.cancelAndWait()
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check eventually onCancelledCalled
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check always (not onSuccessCalled and not onCatchCalled)
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test "can chain onSuccess when future completes":
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var onSuccessCalledTimes = 0
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discard future
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.then(proc() = inc onSuccessCalledTimes)
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.then(proc() = inc onSuccessCalledTimes)
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.then(proc() = inc onSuccessCalledTimes)
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future.complete()
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check eventually onSuccessCalledTimes == 3
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asyncchecksuite "then - Future[T]":
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var error = newError()
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var future: Future[int]
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setup:
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future = newFuture[int]("test void")
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teardown:
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if not future.finished:
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raiseAssert "test should finish future"
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test "then callback is fired when future is already finished":
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var cbVal = 0
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future.complete(1)
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discard future.then(proc(val: int) = cbVal = val)
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check eventually cbVal == 1
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test "then callback is fired after future is finished":
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var cbVal = 0
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discard future.then(proc(val: int) = cbVal = val)
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future.complete(1)
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check eventually cbVal == 1
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test "catch callback is fired when future is already failed":
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var actual: ref CatchableError
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future.fail(error)
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future.catch(proc(err: ref CatchableError) = actual = err)
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check eventually actual == error
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test "catch callback is fired after future is failed":
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var actual: ref CatchableError
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future.catch(proc(err: ref CatchableError) = actual = err)
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future.fail(error)
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check eventually actual == error
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test "cancelled callback is fired when future is already cancelled":
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var fired = false
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await future.cancelAndWait()
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discard future.cancelled(proc() = fired = true)
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check eventually fired
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test "cancelled callback is fired after future is cancelled":
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var fired = false
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discard future.cancelled(proc() = fired = true)
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await future.cancelAndWait()
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check eventually fired
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test "does not fire other callbacks when successful":
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var onSuccessCalled = false
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var onCancelledCalled = false
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var onCatchCalled = false
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future
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.then(proc(val: int) = onSuccessCalled = true)
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.cancelled(proc() = onCancelledCalled = true)
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.catch(proc(e: ref CatchableError) = onCatchCalled = true)
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future.complete(1)
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check eventually onSuccessCalled
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check always (not onCancelledCalled and not onCatchCalled)
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test "does not fire other callbacks when fails":
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var onSuccessCalled = false
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var onCancelledCalled = false
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var onCatchCalled = false
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future
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.then(proc(val: int) = onSuccessCalled = true)
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.cancelled(proc() = onCancelledCalled = true)
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.catch(proc(e: ref CatchableError) = onCatchCalled = true)
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future.fail(error)
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check eventually onCatchCalled
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check always (not onCancelledCalled and not onSuccessCalled)
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test "does not fire other callbacks when cancelled":
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var onSuccessCalled = false
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var onCancelledCalled = false
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var onCatchCalled = false
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future
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.then(proc(val: int) = onSuccessCalled = true)
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.cancelled(proc() = onCancelledCalled = true)
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.catch(proc(e: ref CatchableError) = onCatchCalled = true)
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await future.cancelAndWait()
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check eventually onCancelledCalled
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check always (not onSuccessCalled and not onCatchCalled)
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test "can chain onSuccess when future completes":
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var onSuccessCalledTimes = 0
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discard future
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.then(proc(val: int) = inc onSuccessCalledTimes)
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.then(proc(val: int) = inc onSuccessCalledTimes)
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.then(proc(val: int) = inc onSuccessCalledTimes)
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future.complete(1)
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check eventually onSuccessCalledTimes == 3
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asyncchecksuite "then - Future[?!void]":
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var error = newError()
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var future: Future[?!void]
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setup:
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future = newFuture[?!void]("test void")
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teardown:
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if not future.finished:
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raiseAssert "test should finish future"
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test "then callback is fired when future is already finished":
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var firedImmediately = false
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future.complete(success())
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discard future.then(proc() = firedImmediately = true)
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check eventually firedImmediately
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test "then callback is fired after future is finished":
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var fired = false
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discard future.then(proc() = fired = true)
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future.complete(success())
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check eventually fired
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test "catch callback is fired when future is already failed":
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var actual: ref CatchableError
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future.fail(error)
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future.catch(proc(err: ref CatchableError) = actual = err)
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check eventually actual == error
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test "catch callback is fired after future is failed":
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var actual: ref CatchableError
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future.catch(proc(err: ref CatchableError) = actual = err)
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future.fail(error)
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check eventually actual == error
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test "cancelled callback is fired when future is already cancelled":
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var fired = false
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await future.cancelAndWait()
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discard future.cancelled(proc() = fired = true)
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check eventually fired
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test "cancelled callback is fired after future is cancelled":
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var fired = false
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discard future.cancelled(proc() = fired = true)
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await future.cancelAndWait()
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check eventually fired
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||||
|
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test "does not fire other callbacks when successful":
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||||
var onSuccessCalled = false
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||||
var onCancelledCalled = false
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||||
var onCatchCalled = false
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||||
|
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future
|
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.then(proc() = onSuccessCalled = true)
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.cancelled(proc() = onCancelledCalled = true)
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.catch(proc(e: ref CatchableError) = onCatchCalled = true)
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||||
|
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future.complete(success())
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||||
|
||||
check eventually onSuccessCalled
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||||
check always (not onCancelledCalled and not onCatchCalled)
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||||
|
||||
test "does not fire other callbacks when fails":
|
||||
var onSuccessCalled = false
|
||||
var onCancelledCalled = false
|
||||
var onCatchCalled = false
|
||||
|
||||
future
|
||||
.then(proc() = onSuccessCalled = true)
|
||||
.cancelled(proc() = onCancelledCalled = true)
|
||||
.catch(proc(e: ref CatchableError) = onCatchCalled = true)
|
||||
|
||||
future.fail(error)
|
||||
|
||||
check eventually onCatchCalled
|
||||
check always (not onCancelledCalled and not onSuccessCalled)
|
||||
|
||||
test "does not fire other callbacks when cancelled":
|
||||
var onSuccessCalled = false
|
||||
var onCancelledCalled = false
|
||||
var onCatchCalled = false
|
||||
|
||||
future
|
||||
.then(proc() = onSuccessCalled = true)
|
||||
.cancelled(proc() = onCancelledCalled = true)
|
||||
.catch(proc(e: ref CatchableError) = onCatchCalled = true)
|
||||
|
||||
await future.cancelAndWait()
|
||||
|
||||
check eventually onCancelledCalled
|
||||
check always (not onSuccessCalled and not onCatchCalled)
|
||||
|
||||
test "can chain onSuccess when future completes":
|
||||
var onSuccessCalledTimes = 0
|
||||
discard future
|
||||
.then(proc() = inc onSuccessCalledTimes)
|
||||
.then(proc() = inc onSuccessCalledTimes)
|
||||
.then(proc() = inc onSuccessCalledTimes)
|
||||
future.complete(success())
|
||||
check eventually onSuccessCalledTimes == 3
|
||||
|
||||
asyncchecksuite "then - Future[?!T]":
|
||||
var error = newError()
|
||||
var future: Future[?!int]
|
||||
|
||||
setup:
|
||||
future = newFuture[?!int]("test void")
|
||||
|
||||
teardown:
|
||||
if not future.finished:
|
||||
raiseAssert "test should finish future"
|
||||
|
||||
test "then callback is fired when future is already finished":
|
||||
var cbVal = 0
|
||||
future.complete(success(1))
|
||||
discard future.then(proc(val: int) = cbVal = val)
|
||||
check eventually cbVal == 1
|
||||
|
||||
test "then callback is fired after future is finished":
|
||||
var cbVal = 0
|
||||
discard future.then(proc(val: int) = cbVal = val)
|
||||
future.complete(success(1))
|
||||
check eventually cbVal == 1
|
||||
|
||||
test "catch callback is fired when future is already failed":
|
||||
var actual: ref CatchableError
|
||||
future.fail(error)
|
||||
future.catch(proc(err: ref CatchableError) = actual = err)
|
||||
check eventually actual == error
|
||||
|
||||
test "catch callback is fired after future is failed":
|
||||
var actual: ref CatchableError
|
||||
future.catch(proc(err: ref CatchableError) = actual = err)
|
||||
future.fail(error)
|
||||
check eventually actual == error
|
||||
|
||||
test "cancelled callback is fired when future is already cancelled":
|
||||
var fired = false
|
||||
await future.cancelAndWait()
|
||||
discard future.cancelled(proc() = fired = true)
|
||||
check eventually fired
|
||||
|
||||
test "cancelled callback is fired after future is cancelled":
|
||||
var fired = false
|
||||
discard future.cancelled(proc() = fired = true)
|
||||
await future.cancelAndWait()
|
||||
check eventually fired
|
||||
|
||||
test "does not fire other callbacks when successful":
|
||||
var onSuccessCalled = false
|
||||
var onCancelledCalled = false
|
||||
var onCatchCalled = false
|
||||
|
||||
future
|
||||
.then(proc(val: int) = onSuccessCalled = true)
|
||||
.cancelled(proc() = onCancelledCalled = true)
|
||||
.catch(proc(e: ref CatchableError) = onCatchCalled = true)
|
||||
|
||||
future.complete(success(1))
|
||||
|
||||
check eventually onSuccessCalled
|
||||
check always (not onCancelledCalled and not onCatchCalled)
|
||||
|
||||
test "does not fire other callbacks when fails":
|
||||
var onSuccessCalled = false
|
||||
var onCancelledCalled = false
|
||||
var onCatchCalled = false
|
||||
|
||||
future
|
||||
.then(proc(val: int) = onSuccessCalled = true)
|
||||
.cancelled(proc() = onCancelledCalled = true)
|
||||
.catch(proc(e: ref CatchableError) = onCatchCalled = true)
|
||||
|
||||
future.fail(error)
|
||||
|
||||
check eventually onCatchCalled
|
||||
check always (not onCancelledCalled and not onSuccessCalled)
|
||||
|
||||
test "does not fire other callbacks when cancelled":
|
||||
var onSuccessCalled = false
|
||||
var onCancelledCalled = false
|
||||
var onCatchCalled = false
|
||||
|
||||
future
|
||||
.then(proc(val: int) = onSuccessCalled = true)
|
||||
.cancelled(proc() = onCancelledCalled = true)
|
||||
.catch(proc(e: ref CatchableError) = onCatchCalled = true)
|
||||
|
||||
await future.cancelAndWait()
|
||||
|
||||
check eventually onCancelledCalled
|
||||
check always (not onSuccessCalled and not onCatchCalled)
|
||||
|
||||
test "can chain onSuccess when future completes":
|
||||
var onSuccessCalledTimes = 0
|
||||
discard future
|
||||
.then(proc(val: int) = inc onSuccessCalledTimes)
|
||||
.then(proc(val: int) = inc onSuccessCalledTimes)
|
||||
.then(proc(val: int) = inc onSuccessCalledTimes)
|
||||
future.complete(success(1))
|
||||
check eventually onSuccessCalledTimes == 3
|
||||
Loading…
Reference in New Issue