99 lines
3.3 KiB
Nim
99 lines
3.3 KiB
Nim
import pkg/questionable
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import pkg/questionable/results
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import pkg/metrics
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import ../../logutils
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import ../../market
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import ../salesagent
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import ../statemachine
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import ./errorhandling
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import ./cancelled
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import ./failed
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import ./filled
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import ./ignored
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import ./slotreserving
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import ./errored
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declareCounter(codex_reservations_availability_mismatch, "codex reservations availability_mismatch")
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type
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SalePreparing* = ref object of ErrorHandlingState
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logScope:
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topics = "marketplace sales preparing"
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method `$`*(state: SalePreparing): string = "SalePreparing"
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method onCancelled*(state: SalePreparing, request: StorageRequest): ?State =
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return some State(SaleCancelled())
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method onFailed*(state: SalePreparing, request: StorageRequest): ?State =
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return some State(SaleFailed())
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method onSlotFilled*(state: SalePreparing, requestId: RequestId,
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slotIndex: UInt256): ?State =
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return some State(SaleFilled())
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method run*(state: SalePreparing, machine: Machine): Future[?State] {.async.} =
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let agent = SalesAgent(machine)
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let data = agent.data
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let context = agent.context
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let market = context.market
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let reservations = context.reservations
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await agent.retrieveRequest()
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await agent.subscribe()
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without request =? data.request:
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raiseAssert "no sale request"
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let slotId = slotId(data.requestId, data.slotIndex)
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let state = await market.slotState(slotId)
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if state != SlotState.Free:
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return some State(SaleIgnored(reprocessSlot: false, returnBytes: false))
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# TODO: Once implemented, check to ensure the host is allowed to fill the slot,
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# due to the [sliding window mechanism](https://github.com/codex-storage/codex-research/blob/master/design/marketplace.md#dispersal)
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logScope:
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slotIndex = data.slotIndex
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slotSize = request.ask.slotSize
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duration = request.ask.duration
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pricePerSlot = request.ask.pricePerSlot
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# availability was checked for this slot when it entered the queue, however
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# check to the ensure that there is still availability as they may have
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# changed since being added (other slots may have been processed in that time)
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without availability =? await reservations.findAvailability(
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request.ask.slotSize,
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request.ask.duration,
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request.ask.pricePerSlot,
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request.ask.collateral):
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debug "No availability found for request, ignoring"
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return some State(SaleIgnored(reprocessSlot: true))
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info "Availability found for request, creating reservation"
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without reservation =? await reservations.createReservation(
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availability.id,
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request.ask.slotSize,
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request.id,
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data.slotIndex
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), error:
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trace "Creation of reservation failed"
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# Race condition:
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# reservations.findAvailability (line 64) is no guarantee. You can never know for certain that the reservation can be created until after you have it.
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# Should createReservation fail because there's no space, we proceed to SaleIgnored.
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if error of BytesOutOfBoundsError:
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# Lets monitor how often this happen and if it is often we can make it more inteligent to handle it
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codex_reservations_availability_mismatch.inc()
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return some State(SaleIgnored(reprocessSlot: true))
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return some State(SaleErrored(error: error))
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trace "Reservation created succesfully"
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data.reservation = some reservation
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return some State(SaleSlotReserving())
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