134 lines
3.8 KiB
Nim
134 lines
3.8 KiB
Nim
import pkg/asynctest
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import pkg/questionable
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import pkg/chronos
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import pkg/upraises
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import codex/utils/asyncstatemachine
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import ../helpers/eventually
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type
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State1 = ref object of State
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State2 = ref object of State
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State3 = ref object of State
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State4 = ref object of State
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var runs, cancellations, errors = [0, 0, 0, 0]
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method `$`(state: State1): string = "State1"
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method `$`(state: State2): string = "State2"
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method `$`(state: State3): string = "State3"
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method `$`(state: State4): string = "State4"
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method run(state: State1, machine: Machine): Future[?State] {.async.} =
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inc runs[0]
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return some State(State2.new())
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method run(state: State2, machine: Machine): Future[?State] {.async.} =
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inc runs[1]
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try:
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await sleepAsync(1.hours)
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except CancelledError:
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inc cancellations[1]
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raise
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method run(state: State3, machine: Machine): Future[?State] {.async.} =
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inc runs[2]
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method run(state: State4, machine: Machine): Future[?State] {.async.} =
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inc runs[3]
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raise newException(ValueError, "failed")
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method onMoveToNextStateEvent*(state: State): ?State {.base, upraises:[].} =
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discard
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method onMoveToNextStateEvent(state: State2): ?State =
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some State(State3.new())
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method onMoveToNextStateEvent(state: State3): ?State =
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some State(State1.new())
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method onError(state: State1, error: ref CatchableError): ?State =
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inc errors[0]
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method onError(state: State2, error: ref CatchableError): ?State =
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inc errors[1]
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method onError(state: State3, error: ref CatchableError): ?State =
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inc errors[2]
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method onError(state: State4, error: ref CatchableError): ?State =
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inc errors[3]
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some State(State2.new())
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suite "async state machines":
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var machine: Machine
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proc moveToNextStateEvent(state: State): ?State =
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state.onMoveToNextStateEvent()
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setup:
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runs = [0, 0, 0, 0]
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cancellations = [0, 0, 0, 0]
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errors = [0, 0, 0, 0]
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machine = Machine.new()
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test "should call run on start state":
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machine.start(State1.new())
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check eventually runs[0] == 1
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test "moves to next state when run completes":
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machine.start(State1.new())
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check eventually runs == [1, 1, 0, 0]
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test "state2 moves to state3 on event":
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machine.start(State2.new())
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machine.schedule(moveToNextStateEvent)
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check eventually runs == [0, 1, 1, 0]
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test "state transition will cancel the running state":
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machine.start(State2.new())
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machine.schedule(moveToNextStateEvent)
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check eventually cancellations == [0, 1, 0, 0]
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test "scheduled events are handled one after the other":
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machine.start(State2.new())
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machine.schedule(moveToNextStateEvent)
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machine.schedule(moveToNextStateEvent)
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check eventually runs == [1, 2, 1, 0]
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test "stops scheduling and current state":
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machine.start(State2.new())
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await sleepAsync(1.millis)
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machine.stop()
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machine.schedule(moveToNextStateEvent)
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await sleepAsync(1.millis)
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check runs == [0, 1, 0, 0]
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check cancellations == [0, 1, 0, 0]
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test "forwards errors to error handler":
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machine.start(State4.new())
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check eventually errors == [0, 0, 0, 1] and runs == [0, 1, 0, 1]
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test "error handler ignores CancelledError":
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machine.start(State2.new())
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machine.schedule(moveToNextStateEvent)
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check eventually cancellations == [0, 1, 0, 0]
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check errors == [0, 0, 0, 0]
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test "queries properties of the current state":
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proc description(state: State): string =
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$state
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machine.start(State2.new())
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check eventually machine.query(description) == some "State2"
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machine.schedule(moveToNextStateEvent)
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check eventually machine.query(description) == some "State3"
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test "stops handling queries when stopped":
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proc description(state: State): string =
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$state
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machine.start(State2.new())
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check eventually machine.query(description).isSome
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machine.stop()
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check machine.query(description).isNone
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