72 lines
2.0 KiB
Nim
72 lines
2.0 KiB
Nim
import std/times
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import pkg/ethers
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import pkg/chronos
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import pkg/stint
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import ../clock
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import ../conf
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export clock
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logScope:
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topics = "contracts clock"
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type
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OnChainClock* = ref object of Clock
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provider: Provider
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subscription: Subscription
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offset: times.Duration
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blockNumber: UInt256
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started: bool
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newBlock: AsyncEvent
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proc new*(_: type OnChainClock, provider: Provider): OnChainClock =
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OnChainClock(provider: provider, newBlock: newAsyncEvent())
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proc update(clock: OnChainClock, blck: Block) =
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if number =? blck.number and number > clock.blockNumber:
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let blockTime = initTime(blck.timestamp.truncate(int64), 0)
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let computerTime = getTime()
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clock.offset = blockTime - computerTime
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clock.blockNumber = number
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trace "updated clock", blockTime=blck.timestamp, blockNumber=number, offset=clock.offset
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clock.newBlock.fire()
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proc update(clock: OnChainClock) {.async.} =
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try:
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if latest =? (await clock.provider.getBlock(BlockTag.latest)):
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clock.update(latest)
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except CancelledError as error:
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raise error
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except CatchableError as error:
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debug "error updating clock: ", error=error.msg
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discard
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method start*(clock: OnChainClock) {.async.} =
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if clock.started:
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return
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proc onBlock(_: ?!Block) =
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# ignore block parameter; hardhat may call this with pending blocks
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asyncSpawn clock.update()
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await clock.update()
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clock.subscription = await clock.provider.subscribe(onBlock)
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clock.started = true
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method stop*(clock: OnChainClock) {.async.} =
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if not clock.started:
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return
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await clock.subscription.unsubscribe()
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clock.started = false
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method now*(clock: OnChainClock): SecondsSince1970 =
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doAssert clock.started, "clock should be started before calling now()"
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return toUnix(getTime() + clock.offset)
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method waitUntil*(clock: OnChainClock, time: SecondsSince1970) {.async.} =
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while (let difference = time - clock.now(); difference > 0):
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clock.newBlock.clear()
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discard await clock.newBlock.wait().withTimeout(chronos.seconds(difference))
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