132 lines
3.8 KiB
Nim
132 lines
3.8 KiB
Nim
import pkg/chronos
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import pkg/chronicles
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import pkg/questionable
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import pkg/questionable/results
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import pkg/stint
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import pkg/upraises
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import ../contracts/requests
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import ../errors
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import ./statemachine
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import ./salescontext
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import ./salesdata
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import ./reservations
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export reservations
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logScope:
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topics = "marketplace sales"
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type
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SalesAgent* = ref object of Machine
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context*: SalesContext
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data*: SalesData
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subscribed: bool
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# Slot-level callbacks.
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onCleanUp*: OnCleanUp
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onFilled*: ?OnFilled
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OnCleanUp* = proc: Future[void] {.gcsafe, upraises: [].}
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OnFilled* = proc(request: StorageRequest,
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slotIndex: UInt256) {.gcsafe, upraises: [].}
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SalesAgentError = object of CodexError
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AllSlotsFilledError* = object of SalesAgentError
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func `==`*(a, b: SalesAgent): bool =
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a.data.requestId == b.data.requestId and
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a.data.slotIndex == b.data.slotIndex
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proc newSalesAgent*(context: SalesContext,
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requestId: RequestId,
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slotIndex: UInt256,
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request: ?StorageRequest): SalesAgent =
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var agent = SalesAgent.new()
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agent.context = context
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agent.data = SalesData(
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requestId: requestId,
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slotIndex: slotIndex,
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request: request)
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return agent
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proc retrieveRequest*(agent: SalesAgent) {.async.} =
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let data = agent.data
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let market = agent.context.market
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if data.request.isNone:
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data.request = await market.getRequest(data.requestId)
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proc retrieveRequestState*(agent: SalesAgent): Future[?RequestState] {.async.} =
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let data = agent.data
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let market = agent.context.market
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return await market.requestState(data.requestId)
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func state*(agent: SalesAgent): ?string =
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proc description(state: State): string =
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$state
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agent.query(description)
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proc subscribeCancellation(agent: SalesAgent) {.async.} =
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let data = agent.data
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let clock = agent.context.clock
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proc onCancelled() {.async.} =
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without request =? data.request:
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return
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while true:
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let deadline = max(clock.now, request.expiry.truncate(int64)) + 1
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trace "Waiting for request to be cancelled", now=clock.now, expiry=deadline
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await clock.waitUntil(deadline)
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without state =? await agent.retrieveRequestState():
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error "Uknown request", requestId = data.requestId
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return
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if state == RequestState.Cancelled:
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agent.schedule(cancelledEvent(request))
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break
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debug "The request is not yet canceled, even though it should be. Waiting for some more time.", currentState = state, now=clock.now
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data.cancelled = onCancelled()
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method onFulfilled*(agent: SalesAgent, requestId: RequestId) {.base, gcsafe, upraises: [].} =
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if agent.data.requestId == requestId and
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not agent.data.cancelled.isNil:
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agent.data.cancelled.cancel()
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method onFailed*(agent: SalesAgent, requestId: RequestId) {.base, gcsafe, upraises: [].} =
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without request =? agent.data.request:
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return
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if agent.data.requestId == requestId:
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agent.schedule(failedEvent(request))
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method onSlotFilled*(agent: SalesAgent,
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requestId: RequestId,
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slotIndex: UInt256) {.base, gcsafe, upraises: [].} =
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if agent.data.requestId == requestId and
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agent.data.slotIndex == slotIndex:
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agent.schedule(slotFilledEvent(requestId, slotIndex))
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proc subscribe*(agent: SalesAgent) {.async.} =
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if agent.subscribed:
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return
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await agent.subscribeCancellation()
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agent.subscribed = true
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proc unsubscribe*(agent: SalesAgent) {.async.} =
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if not agent.subscribed:
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return
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let data = agent.data
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if not data.cancelled.isNil and not data.cancelled.finished:
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await data.cancelled.cancelAndWait()
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data.cancelled = nil
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agent.subscribed = false
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proc stop*(agent: SalesAgent) {.async.} =
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await Machine(agent).stop()
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await agent.unsubscribe()
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