nim-codex/codex/proving.nim

80 lines
2.5 KiB
Nim

import std/sets
import pkg/upraises
import pkg/questionable
import pkg/chronicles
import ./por/timing/proofs
import ./clock
export sets
export proofs
type
Proving* = ref object
proofs: Proofs
clock: Clock
loop: ?Future[void]
contracts*: HashSet[ContractId]
onProofRequired: ?OnProofRequired
OnProofRequired* = proc (id: ContractId) {.gcsafe, upraises:[].}
func new*(_: type Proving, proofs: Proofs, clock: Clock): Proving =
Proving(proofs: proofs, clock: clock)
proc `onProofRequired=`*(proving: Proving, callback: OnProofRequired) =
proving.onProofRequired = some callback
func add*(proving: Proving, id: ContractId) =
proving.contracts.incl(id)
proc getCurrentPeriod(proving: Proving): Future[Period] {.async.} =
let periodicity = await proving.proofs.periodicity()
return periodicity.periodOf(proving.clock.now().u256)
proc waitUntilPeriod(proving: Proving, period: Period) {.async.} =
let periodicity = await proving.proofs.periodicity()
await proving.clock.waitUntil(periodicity.periodStart(period).truncate(int64))
proc removeEndedContracts(proving: Proving) {.async.} =
let now = proving.clock.now().u256
var ended: HashSet[ContractId]
for id in proving.contracts:
if now >= (await proving.proofs.getProofEnd(id)):
ended.incl(id)
proving.contracts.excl(ended)
proc run(proving: Proving) {.async.} =
try:
while true:
let currentPeriod = await proving.getCurrentPeriod()
await proving.removeEndedContracts()
for id in proving.contracts:
if (await proving.proofs.isProofRequired(id)) or
(await proving.proofs.willProofBeRequired(id)):
if callback =? proving.onProofRequired:
callback(id)
await proving.waitUntilPeriod(currentPeriod + 1)
except CancelledError:
discard
except CatchableError as e:
error "Proving failed", msg = e.msg
proc start*(proving: Proving) {.async.} =
if proving.loop.isSome:
return
proving.loop = some proving.run()
proc stop*(proving: Proving) {.async.} =
if loop =? proving.loop:
proving.loop = Future[void].none
if not loop.finished:
await loop.cancelAndWait()
proc submitProof*(proving: Proving, id: ContractId, proof: seq[byte]) {.async.} =
await proving.proofs.submitProof(id, proof)
proc subscribeProofSubmission*(proving: Proving,
callback: OnProofSubmitted):
Future[Subscription] =
proving.proofs.subscribeProofSubmission(callback)