-
Notifications
You must be signed in to change notification settings - Fork 29
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
add property-based test for multipaxos
- Loading branch information
Showing
3 changed files
with
187 additions
and
18 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| import org.scalacheck.Arbitrary.arbitrary | ||
| import org.scalacheck.Prop.propBoolean | ||
| import org.scalacheck.{Arbitrary, Gen, Prop} | ||
| import rdts.base.{Lattice, LocalUid} | ||
| import rdts.datatypes.experiments.protocols.{MultiPaxos, Participants} | ||
|
|
||
| import scala.util.Try | ||
|
|
||
| extension [A](s1: Seq[A]) | ||
| def isPrefix(s2: Seq[A]): Boolean = s1.indexOfSlice(s2) == 0 | ||
|
|
||
| class MultiPaxosSuite extends munit.ScalaCheckSuite { | ||
| // override def scalaCheckInitialSeed = "6Y9lv63LraBdJTHwHFLm3ItFEF7sm6Ok2D3S22VQcTO=" | ||
|
|
||
| override def scalaCheckTestParameters = | ||
| super.scalaCheckTestParameters | ||
| .withMinSuccessfulTests(1000) | ||
| .withMinSize(30) | ||
| .withMaxSize(500) | ||
|
|
||
| property("Multipaxos")(MultiPaxosSpec[Int]( | ||
| logging = false, | ||
| minDevices = 3, | ||
| maxDevices = 5, | ||
| proposeFreq = 5, | ||
| startElectionFreq = 1, | ||
| mergeFreq = 80 | ||
| ).property()) | ||
| } | ||
|
|
||
| class MultiPaxosSpec[A: Arbitrary]( | ||
| logging: Boolean = false, | ||
| minDevices: Int, | ||
| maxDevices: Int, | ||
| proposeFreq: Int, | ||
| startElectionFreq: Int, | ||
| mergeFreq: Int | ||
| ) extends CommandsARDTs[MultiPaxos[A]] { | ||
|
|
||
| override def genInitialState: Gen[State] = | ||
| for | ||
| numDevices <- Gen.choose(minDevices, maxDevices) | ||
| ids = Range(0, numDevices).map(_ => LocalUid.gen()).toList | ||
| yield ids.map(id => (id, MultiPaxos())).toMap | ||
|
|
||
| override def genCommand(state: State): Gen[Command] = | ||
| Gen.frequency( | ||
| (mergeFreq, genMerge(state)), | ||
| (proposeFreq, genPropose(state)), | ||
| (startElectionFreq, genStartElection(state)) | ||
| ) | ||
|
|
||
| def genPropose(state: State): Gen[Propose] = | ||
| for | ||
| id <- genId(state) | ||
| value <- arbitrary[A] | ||
| yield Propose(id, value) | ||
|
|
||
| def genStartElection(state: State): Gen[StartElection] = genId(state).map(StartElection(_)) | ||
|
|
||
| def genMerge(state: State): Gen[Merge] = | ||
| for | ||
| (left, right) <- genId2(state) | ||
| yield Merge(left, right) | ||
|
|
||
| // commands: (merge), upkeep, write, addMember, removeMember | ||
| case class Merge(left: LocalUid, right: LocalUid) extends ACommand(left): | ||
| override def nextLocalState(states: Map[LocalUid, MultiPaxos[A]]): MultiPaxos[A] = | ||
| given Participants(states.keySet.map(_.uid)) | ||
| val merged = states(left).merge(states(right)) | ||
| val result = merged.merge(merged.upkeep(using left)) | ||
|
|
||
| if logging then | ||
| if result.read.length > 1 then | ||
| println(result) | ||
| result | ||
|
|
||
| override def postCondition(state: State, result: Try[Result]): Prop = | ||
| given Participants(state.keySet.map(_.uid)) | ||
| val res: Map[LocalUid, MultiPaxos[A]] = result.get | ||
| Prop.forAll(genId2(res)) { | ||
| (index1, index2) => | ||
| (state(index1), state(index2), res(index1), res(index2)) match | ||
| case (oldMultipaxos1, oldMultipaxos2, multipaxos1, multipaxos2) => | ||
| val (log1, log2) = (multipaxos1.read, multipaxos2.read) | ||
| val (oldLog1, oldLog2) = (oldMultipaxos1.read, oldMultipaxos2.read) | ||
| (log1.isPrefix(log2) || log2.isPrefix( | ||
| log1 | ||
| )) :| s"every log is a prefix of another log or vice versa, but we had:\n${multipaxos1.rounds.counter}${multipaxos1.read}\n${multipaxos2.rounds.counter}${multipaxos2.read}" && | ||
| // ((multipaxos1.rounds.counter != multipaxos2.rounds.counter) || multipaxos1.leader.isEmpty || multipaxos2.leader.isEmpty || (multipaxos1.leader == multipaxos2.leader)) :| s"There can only ever be one leader for a given epoch but we got:\n${multipaxos1.leader}\n${multipaxos2.leader}" && | ||
| (log1.isPrefix(oldLog1) && log2.isPrefix(oldLog2)) :| s"logs never shrink" | ||
| } | ||
|
|
||
| case class Propose(proposer: LocalUid, value: A) extends ACommand(proposer): | ||
| override def nextLocalState(states: Map[LocalUid, MultiPaxos[A]]): MultiPaxos[A] = | ||
| given Participants(states.keySet.map(_.uid)) | ||
| val delta = states(proposer).proposeIfLeader(value)(using proposer) | ||
| val proposed = Lattice.merge(states(proposer), delta) | ||
| Lattice.merge(proposed, proposed.upkeep(using proposer)) | ||
|
|
||
| case class StartElection(initiator: LocalUid) extends ACommand(initiator): | ||
| override def nextLocalState(states: Map[LocalUid, MultiPaxos[A]]): MultiPaxos[A] = | ||
| given Participants(states.keySet.map(_.uid)) | ||
| val delta = states(initiator).startLeaderElection(using initiator) | ||
| val merged = Lattice.merge(states(initiator), delta) | ||
| Lattice.merge(merged, merged.upkeep(using initiator)) | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters