114 lines
3.4 KiB
Nim
114 lines
3.4 KiB
Nim
import std/algorithm
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import chronicles
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import common, api
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const
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ServiceName = "fork_service"
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logScope: service = ServiceName
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proc validateForkSchedule(forks: openArray[Fork]): bool {.raises: [Defect].} =
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# Check if `forks` list is linked list.
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var current_version = forks[0].current_version
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for index, item in forks:
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if index > 0:
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if item.previous_version != current_version:
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return false
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else:
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if item.previous_version != item.current_version:
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return false
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current_version = item.current_version
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true
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proc sortForks(forks: openArray[Fork]): Result[seq[Fork], cstring] {.
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raises: [Defect].} =
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proc cmp(x, y: Fork): int {.closure.} =
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if uint64(x.epoch) == uint64(y.epoch): return 0
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if uint64(x.epoch) < uint64(y.epoch): return -1
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return 1
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if len(forks) == 0:
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return err("Empty fork schedule")
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let sortedForks = sorted(forks, cmp)
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if not(validateForkSchedule(sortedForks)):
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return err("Invalid fork schedule")
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ok(sortedForks)
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proc pollForFork(vc: ValidatorClientRef) {.async.} =
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let sres = vc.getCurrentSlot()
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if sres.isSome():
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let
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currentSlot = sres.get()
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currentEpoch = currentSlot.epoch()
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let forks =
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try:
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await vc.getForkSchedule()
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except ValidatorApiError as exc:
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error "Unable to retrieve fork schedule", reason = exc.msg
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return
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except CancelledError as exc:
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debug "Fork retrieval process was interrupted"
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raise exc
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except CatchableError as exc:
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error "Unexpected error occured while getting fork information",
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err_name = exc.name, err_msg = exc.msg
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return
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let sortedForks =
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block:
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let res = sortForks(forks)
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if res.isErr():
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error "Invalid fork schedule received", reason = res.error()
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return
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res.get()
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if (len(vc.forks) == 0) or (vc.forks != sortedForks):
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vc.forks = sortedForks
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notice "Fork schedule updated", fork_schedule = sortedForks
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vc.forksAvailable.fire()
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proc waitForNextEpoch(service: ForkServiceRef) {.async.} =
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let vc = service.client
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let sleepTime = vc.beaconClock.durationToNextEpoch() + TIME_DELAY_FROM_SLOT
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debug "Sleeping until next epoch", sleep_time = sleepTime
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await sleepAsync(sleepTime)
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proc mainLoop(service: ForkServiceRef) {.async.} =
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let vc = service.client
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service.state = ServiceState.Running
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debug "Service started"
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while true:
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# This loop could look much more nicer/better, when
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# https://github.com/nim-lang/Nim/issues/19911 will be fixed, so it could
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# become safe to combine loops, breaks and exception handlers.
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let breakLoop =
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try:
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await vc.pollForFork()
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await service.waitForNextEpoch()
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false
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except CancelledError:
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debug "Service interrupted"
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true
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except CatchableError as exc:
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warn "Service crashed with unexpected error", err_name = exc.name,
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err_msg = exc.msg
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true
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if breakLoop:
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break
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proc init*(t: typedesc[ForkServiceRef],
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vc: ValidatorClientRef): Future[ForkServiceRef] {.async.} =
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logScope: service = ServiceName
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let res = ForkServiceRef(name: ServiceName,
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client: vc, state: ServiceState.Initialized)
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debug "Initializing service"
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await vc.pollForFork()
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return res
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proc start*(service: ForkServiceRef) =
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service.lifeFut = mainLoop(service)
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