41 lines
998 B
Nim
41 lines
998 B
Nim
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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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type
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Clock* = ref object
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provider: Provider
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subscription: Subscription
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offset: int64
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started: bool
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SecondsSince1970* = int64
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proc new*(_: type Clock, provider: Provider): Clock =
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Clock(provider: provider)
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proc start*(clock: Clock) {.async.} =
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if clock.started:
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return
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clock.started = true
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proc onBlock(blck: Block) {.gcsafe, upraises:[].} =
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let blockTime = blck.timestamp.truncate(int64)
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let computerTime = getTime().toUnix
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clock.offset = blockTime - computerTime
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onBlock(!await clock.provider.getBlock(BlockTag.latest))
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clock.subscription = await clock.provider.subscribe(onBlock)
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proc stop*(clock: Clock) {.async.} =
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if not clock.started:
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return
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clock.started = false
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await clock.subscription.unsubscribe()
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proc now*(clock: Clock): SecondsSince1970 =
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doAssert clock.started, "clock should be started before calling now()"
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getTime().toUnix + clock.offset
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