fix: createReservation lock (#825)
* fix: createReservation lock * fix: additional locking places * fix: acquire lock * chore: feedback Co-authored-by: markspanbroek <mark@spanbroek.net> Signed-off-by: Adam Uhlíř <adam@uhlir.dev> * feat: withLock template and fixed tests * fix: use proc for MockReservations constructor * chore: feedback Co-authored-by: Eric <5089238+emizzle@users.noreply.github.com> Signed-off-by: Adam Uhlíř <adam@uhlir.dev> * chore: feedback implementation --------- Signed-off-by: Adam Uhlíř <adam@uhlir.dev> Co-authored-by: markspanbroek <mark@spanbroek.net> Co-authored-by: Eric <5089238+emizzle@users.noreply.github.com>
This commit is contained in:
parent
6e9bdf1d7e
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1a57341b7d
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@ -53,6 +53,7 @@ export logutils
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logScope:
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topics = "sales reservations"
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type
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AvailabilityId* = distinct array[32, byte]
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ReservationId* = distinct array[32, byte]
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@ -71,7 +72,8 @@ type
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size* {.serialize.}: UInt256
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requestId* {.serialize.}: RequestId
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slotIndex* {.serialize.}: UInt256
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Reservations* = ref object
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Reservations* = ref object of RootObj
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availabilityLock: AsyncLock # Lock for protecting assertions of availability's sizes when searching for matching availability
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repo: RepoStore
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onAvailabilityAdded: ?OnAvailabilityAdded
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GetNext* = proc(): Future[?seq[byte]] {.upraises: [], gcsafe, closure.}
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@ -95,12 +97,22 @@ const
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SalesKey = (CodexMetaKey / "sales").tryGet # TODO: move to sales module
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ReservationsKey = (SalesKey / "reservations").tryGet
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proc hash*(x: AvailabilityId): Hash {.borrow.}
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proc all*(self: Reservations, T: type SomeStorableObject): Future[?!seq[T]] {.async.}
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template withLock(lock, body) =
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try:
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await lock.acquire()
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body
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finally:
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if lock.locked:
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lock.release()
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proc new*(T: type Reservations,
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repo: RepoStore): Reservations =
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T(repo: repo)
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T(availabilityLock: newAsyncLock(),repo: repo)
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proc init*(
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_: type Availability,
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@ -221,20 +233,19 @@ proc updateImpl(
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return success()
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proc update*(
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self: Reservations,
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obj: Reservation): Future[?!void] {.async.} =
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return await self.updateImpl(obj)
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proc update*(
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proc updateAvailability(
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self: Reservations,
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obj: Availability): Future[?!void] {.async.} =
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logScope:
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availabilityId = obj.id
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without key =? obj.key, error:
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return failure(error)
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without oldAvailability =? await self.get(key, Availability), err:
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if err of NotExistsError:
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trace "Creating new Availability"
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let res = await self.updateImpl(obj)
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# inform subscribers that Availability has been added
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if onAvailabilityAdded =? self.onAvailabilityAdded:
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@ -248,14 +259,14 @@ proc update*(
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except CatchableError as e:
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# we don't have any insight into types of exceptions that
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# `onAvailabilityAdded` can raise because it is caller-defined
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warn "Unknown error during 'onAvailabilityAdded' callback",
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availabilityId = obj.id, error = e.msg
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warn "Unknown error during 'onAvailabilityAdded' callback", error = e.msg
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return res
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else:
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return failure(err)
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# Sizing of the availability changed, we need to adjust the repo reservation accordingly
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if oldAvailability.totalSize != obj.totalSize:
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trace "totalSize changed, updating repo reservation"
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if oldAvailability.totalSize < obj.totalSize: # storage added
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if reserveErr =? (await self.repo.reserve((obj.totalSize - oldAvailability.totalSize).truncate(uint))).errorOption:
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return failure(reserveErr.toErr(ReserveFailedError))
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@ -280,11 +291,21 @@ proc update*(
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except CatchableError as e:
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# we don't have any insight into types of exceptions that
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# `onAvailabilityAdded` can raise because it is caller-defined
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warn "Unknown error during 'onAvailabilityAdded' callback",
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availabilityId = obj.id, error = e.msg
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warn "Unknown error during 'onAvailabilityAdded' callback", error = e.msg
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return res
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proc update*(
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self: Reservations,
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obj: Reservation): Future[?!void] {.async.} =
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return await self.updateImpl(obj)
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proc update*(
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self: Reservations,
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obj: Availability): Future[?!void] {.async.} =
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withLock(self.availabilityLock):
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return await self.updateAvailability(obj)
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proc delete(
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self: Reservations,
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key: Key): Future[?!void] {.async.} =
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@ -312,31 +333,32 @@ proc deleteReservation*(
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without key =? key(reservationId, availabilityId), error:
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return failure(error)
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without reservation =? (await self.get(key, Reservation)), error:
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if error of NotExistsError:
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return success()
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else:
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return failure(error)
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withLock(self.availabilityLock):
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without reservation =? (await self.get(key, Reservation)), error:
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if error of NotExistsError:
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return success()
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else:
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return failure(error)
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if reservation.size > 0.u256:
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trace "returning remaining reservation bytes to availability",
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size = reservation.size
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if reservation.size > 0.u256:
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trace "returning remaining reservation bytes to availability",
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size = reservation.size
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without availabilityKey =? availabilityId.key, error:
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return failure(error)
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without availabilityKey =? availabilityId.key, error:
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return failure(error)
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without var availability =? await self.get(availabilityKey, Availability), error:
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return failure(error)
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without var availability =? await self.get(availabilityKey, Availability), error:
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return failure(error)
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availability.freeSize += reservation.size
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availability.freeSize += reservation.size
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if updateErr =? (await self.update(availability)).errorOption:
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return failure(updateErr)
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if updateErr =? (await self.updateAvailability(availability)).errorOption:
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return failure(updateErr)
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if err =? (await self.repo.metaDs.delete(key)).errorOption:
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return failure(err.toErr(DeleteFailedError))
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if err =? (await self.repo.metaDs.delete(key)).errorOption:
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return failure(err.toErr(DeleteFailedError))
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return success()
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return success()
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# TODO: add support for deleting availabilities
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# To delete, must not have any active sales.
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@ -370,54 +392,57 @@ proc createAvailability*(
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return success(availability)
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proc createReservation*(
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method createReservation*(
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self: Reservations,
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availabilityId: AvailabilityId,
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slotSize: UInt256,
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requestId: RequestId,
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slotIndex: UInt256
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): Future[?!Reservation] {.async.} =
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): Future[?!Reservation] {.async, base.} =
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trace "creating reservation", availabilityId, slotSize, requestId, slotIndex
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withLock(self.availabilityLock):
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without availabilityKey =? availabilityId.key, error:
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return failure(error)
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let reservation = Reservation.init(availabilityId, slotSize, requestId, slotIndex)
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without availability =? await self.get(availabilityKey, Availability), error:
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return failure(error)
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without availabilityKey =? availabilityId.key, error:
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return failure(error)
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# Check that the found availability has enough free space after the lock has been acquired, to prevent asynchronous Availiability modifications
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if availability.freeSize < slotSize:
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let error = newException(
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BytesOutOfBoundsError,
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"trying to reserve an amount of bytes that is greater than the total size of the Availability")
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return failure(error)
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without var availability =? await self.get(availabilityKey, Availability), error:
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return failure(error)
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trace "Creating reservation", availabilityId, slotSize, requestId, slotIndex
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if availability.freeSize < slotSize:
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let error = newException(
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BytesOutOfBoundsError,
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"trying to reserve an amount of bytes that is greater than the total size of the Availability")
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return failure(error)
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let reservation = Reservation.init(availabilityId, slotSize, requestId, slotIndex)
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if createResErr =? (await self.update(reservation)).errorOption:
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return failure(createResErr)
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if createResErr =? (await self.update(reservation)).errorOption:
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return failure(createResErr)
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# reduce availability freeSize by the slot size, which is now accounted for in
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# the newly created Reservation
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availability.freeSize -= slotSize
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# reduce availability freeSize by the slot size, which is now accounted for in
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# the newly created Reservation
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availability.freeSize -= slotSize
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# update availability with reduced size
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if updateErr =? (await self.update(availability)).errorOption:
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# update availability with reduced size
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trace "Updating availability with reduced size"
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if updateErr =? (await self.updateAvailability(availability)).errorOption:
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trace "Updating availability failed, rolling back reservation creation"
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trace "rolling back reservation creation"
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without key =? reservation.key, keyError:
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keyError.parent = updateErr
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return failure(keyError)
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without key =? reservation.key, keyError:
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keyError.parent = updateErr
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return failure(keyError)
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# rollback the reservation creation
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if rollbackErr =? (await self.delete(key)).errorOption:
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rollbackErr.parent = updateErr
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return failure(rollbackErr)
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# rollback the reservation creation
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if rollbackErr =? (await self.delete(key)).errorOption:
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rollbackErr.parent = updateErr
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return failure(rollbackErr)
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return failure(updateErr)
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return failure(updateErr)
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return success(reservation)
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trace "Reservation succesfully created"
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return success(reservation)
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proc returnBytesToAvailability*(
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self: Reservations,
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@ -429,48 +454,48 @@ proc returnBytesToAvailability*(
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reservationId
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availabilityId
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withLock(self.availabilityLock):
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without key =? key(reservationId, availabilityId), error:
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return failure(error)
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without key =? key(reservationId, availabilityId), error:
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return failure(error)
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without var reservation =? (await self.get(key, Reservation)), error:
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return failure(error)
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without var reservation =? (await self.get(key, Reservation)), error:
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return failure(error)
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# We are ignoring bytes that are still present in the Reservation because
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# they will be returned to Availability through `deleteReservation`.
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let bytesToBeReturned = bytes - reservation.size
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# We are ignoring bytes that are still present in the Reservation because
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# they will be returned to Availability through `deleteReservation`.
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let bytesToBeReturned = bytes - reservation.size
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if bytesToBeReturned == 0:
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trace "No bytes are returned", requestSizeBytes = bytes, returningBytes = bytesToBeReturned
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return success()
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trace "Returning bytes", requestSizeBytes = bytes, returningBytes = bytesToBeReturned
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# First lets see if we can re-reserve the bytes, if the Repo's quota
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# is depleted then we will fail-fast as there is nothing to be done atm.
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if reserveErr =? (await self.repo.reserve(bytesToBeReturned.truncate(uint))).errorOption:
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return failure(reserveErr.toErr(ReserveFailedError))
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without availabilityKey =? availabilityId.key, error:
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return failure(error)
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without var availability =? await self.get(availabilityKey, Availability), error:
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return failure(error)
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availability.freeSize += bytesToBeReturned
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# Update availability with returned size
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if updateErr =? (await self.updateAvailability(availability)).errorOption:
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trace "Rolling back returning bytes"
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if rollbackErr =? (await self.repo.release(bytesToBeReturned.truncate(uint))).errorOption:
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rollbackErr.parent = updateErr
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return failure(rollbackErr)
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return failure(updateErr)
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if bytesToBeReturned == 0:
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trace "No bytes are returned", requestSizeBytes = bytes, returningBytes = bytesToBeReturned
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return success()
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trace "Returning bytes", requestSizeBytes = bytes, returningBytes = bytesToBeReturned
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# First lets see if we can re-reserve the bytes, if the Repo's quota
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# is depleted then we will fail-fast as there is nothing to be done atm.
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if reserveErr =? (await self.repo.reserve(bytesToBeReturned.truncate(uint))).errorOption:
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return failure(reserveErr.toErr(ReserveFailedError))
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without availabilityKey =? availabilityId.key, error:
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return failure(error)
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without var availability =? await self.get(availabilityKey, Availability), error:
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return failure(error)
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availability.freeSize += bytesToBeReturned
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# Update availability with returned size
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if updateErr =? (await self.update(availability)).errorOption:
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trace "Rolling back returning bytes"
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if rollbackErr =? (await self.repo.release(bytesToBeReturned.truncate(uint))).errorOption:
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rollbackErr.parent = updateErr
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return failure(rollbackErr)
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return failure(updateErr)
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return success()
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proc release*(
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self: Reservations,
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reservationId: ReservationId,
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@ -621,6 +646,7 @@ proc findAvailability*(
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minPrice >= availability.minPrice:
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trace "availability matched",
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id = availability.id,
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size, availFreeSize = availability.freeSize,
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duration, availDuration = availability.duration,
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minPrice, availMinPrice = availability.minPrice,
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@ -635,6 +661,7 @@ proc findAvailability*(
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return some availability
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trace "availability did not match",
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id = availability.id,
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size, availFreeSize = availability.freeSize,
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duration, availDuration = availability.duration,
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minPrice, availMinPrice = availability.minPrice,
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@ -1,5 +1,6 @@
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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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@ -13,6 +14,8 @@ import ./ignored
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import ./downloading
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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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@ -78,7 +81,18 @@ method run*(state: SalePreparing, machine: Machine): Future[?State] {.async.} =
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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())
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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(SaleDownloading())
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@ -0,0 +1,33 @@
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import pkg/chronos
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import pkg/codex/sales
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import pkg/codex/stores
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import pkg/questionable/results
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type
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MockReservations* = ref object of Reservations
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createReservationThrowBytesOutOfBoundsError: bool
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proc new*(
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T: type MockReservations,
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repo: RepoStore
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): MockReservations =
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## Create a mock clock instance
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MockReservations(availabilityLock: newAsyncLock(), repo: repo)
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proc setCreateReservationThrowBytesOutOfBoundsError*(self: MockReservations, flag: bool) =
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self.createReservationThrowBytesOutOfBoundsError = flag
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method createReservation*(
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self: MockReservations,
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availabilityId: AvailabilityId,
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slotSize: UInt256,
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requestId: RequestId,
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slotIndex: UInt256): Future[?!Reservation] {.async.} =
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if self.createReservationThrowBytesOutOfBoundsError:
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let error = newException(
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BytesOutOfBoundsError,
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"trying to reserve an amount of bytes that is greater than the total size of the Availability")
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return failure(error)
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return await procCall createReservation(Reservations(self), availabilityId, slotSize, requestId, slotIndex)
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@ -1,20 +1,66 @@
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import std/unittest
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import pkg/chronos
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import pkg/questionable
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import pkg/datastore
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import pkg/stew/byteutils
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import pkg/codex/contracts/requests
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import pkg/codex/sales/states/preparing
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import pkg/codex/sales/states/downloading
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import pkg/codex/sales/states/cancelled
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import pkg/codex/sales/states/failed
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import pkg/codex/sales/states/filled
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import pkg/codex/sales/states/ignored
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import pkg/codex/sales/states/errored
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import pkg/codex/sales/salesagent
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import pkg/codex/sales/salescontext
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import pkg/codex/sales/reservations
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import pkg/codex/stores/repostore
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import ../../../asynctest
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import ../../helpers
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import ../../examples
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import ../../helpers/mockmarket
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import ../../helpers/mockreservations
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import ../../helpers/mockclock
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suite "sales state 'preparing'":
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asyncchecksuite "sales state 'preparing'":
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let request = StorageRequest.example
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let slotIndex = (request.ask.slots div 2).u256
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let market = MockMarket.new()
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let clock = MockClock.new()
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var agent: SalesAgent
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var state: SalePreparing
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var repo: RepoStore
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var availability: Availability
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var context: SalesContext
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var reservations: MockReservations
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setup:
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availability = Availability(
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totalSize: request.ask.slotSize + 100.u256,
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freeSize: request.ask.slotSize + 100.u256,
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duration: request.ask.duration + 60.u256,
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minPrice: request.ask.pricePerSlot - 10.u256,
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maxCollateral: request.ask.collateral + 400.u256
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)
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||||
let repoDs = SQLiteDatastore.new(Memory).tryGet()
|
||||
let metaDs = SQLiteDatastore.new(Memory).tryGet()
|
||||
repo = RepoStore.new(repoDs, metaDs)
|
||||
await repo.start()
|
||||
|
||||
state = SalePreparing.new()
|
||||
context = SalesContext(
|
||||
market: market,
|
||||
clock: clock
|
||||
)
|
||||
|
||||
reservations = MockReservations.new(repo)
|
||||
context.reservations = reservations
|
||||
agent = newSalesAgent(context,
|
||||
request.id,
|
||||
slotIndex,
|
||||
request.some)
|
||||
|
||||
teardown:
|
||||
await repo.stop()
|
||||
|
||||
test "switches to cancelled state when request expires":
|
||||
let next = state.onCancelled(request)
|
||||
|
@ -27,3 +73,28 @@ suite "sales state 'preparing'":
|
|||
test "switches to filled state when slot is filled":
|
||||
let next = state.onSlotFilled(request.id, slotIndex)
|
||||
check !next of SaleFilled
|
||||
|
||||
proc createAvailability() {.async.} =
|
||||
let a = await reservations.createAvailability(
|
||||
availability.totalSize,
|
||||
availability.duration,
|
||||
availability.minPrice,
|
||||
availability.maxCollateral
|
||||
)
|
||||
availability = a.get
|
||||
|
||||
test "run switches to ignored when no availability":
|
||||
let next = await state.run(agent)
|
||||
check !next of SaleIgnored
|
||||
|
||||
test "run switches to downloading when reserved":
|
||||
await createAvailability()
|
||||
let next = await state.run(agent)
|
||||
check !next of SaleDownloading
|
||||
|
||||
test "run switches to ignored when reserve fails with BytesOutOfBounds":
|
||||
await createAvailability()
|
||||
reservations.setCreateReservationThrowBytesOutOfBoundsError(true)
|
||||
|
||||
let next = await state.run(agent)
|
||||
check !next of SaleIgnored
|
||||
|
|
|
@ -1,4 +1,5 @@
|
|||
import std/random
|
||||
import std/sequtils
|
||||
|
||||
import pkg/questionable
|
||||
import pkg/questionable/results
|
||||
|
@ -6,6 +7,7 @@ import pkg/chronos
|
|||
import pkg/datastore
|
||||
|
||||
import pkg/codex/stores
|
||||
import pkg/codex/errors
|
||||
import pkg/codex/sales
|
||||
import pkg/codex/utils/json
|
||||
|
||||
|
@ -13,6 +15,8 @@ import ../../asynctest
|
|||
import ../examples
|
||||
import ../helpers
|
||||
|
||||
const CONCURRENCY_TESTS_COUNT = 1000
|
||||
|
||||
asyncchecksuite "Reservations module":
|
||||
var
|
||||
repo: RepoStore
|
||||
|
@ -148,6 +152,39 @@ asyncchecksuite "Reservations module":
|
|||
check created.isErr
|
||||
check created.error of BytesOutOfBoundsError
|
||||
|
||||
test "cannot create reservation larger than availability size - concurrency test":
|
||||
proc concurrencyTest(): Future[void] {.async.} =
|
||||
let availability = createAvailability()
|
||||
let one = reservations.createReservation(
|
||||
availability.id,
|
||||
availability.totalSize - 1,
|
||||
RequestId.example,
|
||||
UInt256.example
|
||||
)
|
||||
|
||||
let two = reservations.createReservation(
|
||||
availability.id,
|
||||
availability.totalSize,
|
||||
RequestId.example,
|
||||
UInt256.example
|
||||
)
|
||||
|
||||
let oneResult = await one
|
||||
let twoResult = await two
|
||||
|
||||
check oneResult.isErr or twoResult.isErr
|
||||
if oneResult.isErr:
|
||||
check oneResult.error of BytesOutOfBoundsError
|
||||
if twoResult.isErr:
|
||||
check twoResult.error of BytesOutOfBoundsError
|
||||
|
||||
var futures: seq[Future[void]]
|
||||
for _ in 1..CONCURRENCY_TESTS_COUNT:
|
||||
futures.add(concurrencyTest())
|
||||
|
||||
await allFuturesThrowing(futures)
|
||||
|
||||
|
||||
test "creating reservation reduces availability size":
|
||||
let availability = createAvailability()
|
||||
let orig = availability.freeSize
|
||||
|
|
|
@ -6,5 +6,9 @@ import ./states/testinitialproving
|
|||
import ./states/testfilled
|
||||
import ./states/testproving
|
||||
import ./states/testsimulatedproving
|
||||
import ./states/testcancelled
|
||||
import ./states/testerrored
|
||||
import ./states/testignored
|
||||
import ./states/testpreparing
|
||||
|
||||
{.warning[UnusedImport]: off.}
|
||||
|
|
Loading…
Reference in New Issue