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PeerSelection.hs
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PeerSelection.hs
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{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE CPP #-}
{-# LANGUAGE DeriveFunctor #-}
{-# LANGUAGE DerivingStrategies #-}
{-# LANGUAGE DerivingVia #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE GeneralisedNewtypeDeriving #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE NumericUnderscores #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE TypeApplications #-}
{-# OPTIONS_GHC -Wno-orphans #-}
-- TODO: remove it once #3601 is fixed
{-# OPTIONS_GHC -Wno-unused-top-binds #-}
{-# OPTIONS_GHC -Wno-incomplete-uni-patterns #-}
#if __GLASGOW_HASKELL__ >= 908
{-# OPTIONS_GHC -Wno-x-partial #-}
#endif
module Test.Ouroboros.Network.PeerSelection
( tests
, unfHydra
, takeBigLedgerPeers
, dropBigLedgerPeers
) where
import Control.Concurrent.Class.MonadSTM.Strict
import Control.Exception (AssertionFailed (..), catch, evaluate)
import Control.Monad.Class.MonadTime.SI
import Control.Monad.Class.MonadTimer.SI
import Control.Tracer (Tracer (..))
import Data.Bifoldable (bitraverse_)
import Data.ByteString.Char8 qualified as BS
import Data.Foldable (traverse_)
import Data.Function (on)
import Data.IP qualified as IP
import Data.List (foldl', groupBy, intercalate)
import Data.List.Trace qualified as Trace
import Data.Map.Strict (Map)
import Data.Map.Strict qualified as Map
import Data.Maybe (fromMaybe, isNothing, listToMaybe)
import Data.OrdPSQ qualified as PSQ
import Data.Set (Set)
import Data.Set qualified as Set
import Data.Void (Void)
import System.Random (mkStdGen)
import Network.DNS qualified as DNS (defaultResolvConf)
import Network.Socket (SockAddr)
import Ouroboros.Network.ConnectionManager.Test.Timeouts (AllProperty (..))
import Ouroboros.Network.ExitPolicy (RepromoteDelay (..))
import Ouroboros.Network.PeerSelection.Bootstrap (UseBootstrapPeers (..),
requiresBootstrapPeers)
import Ouroboros.Network.PeerSelection.Governor hiding (PeerSelectionState (..),
peerSharing)
import Ouroboros.Network.PeerSelection.Governor qualified as Governor
import Ouroboros.Network.PeerSelection.LedgerPeers
import Ouroboros.Network.PeerSelection.PeerAdvertise
import Ouroboros.Network.PeerSelection.PeerSharing (PeerSharing (..))
import Ouroboros.Network.PeerSelection.PeerTrustable (PeerTrustable (..))
import Ouroboros.Network.PeerSelection.PublicRootPeers (PublicRootPeers)
import Ouroboros.Network.PeerSelection.PublicRootPeers qualified as PublicRootPeers
import Ouroboros.Network.PeerSelection.RootPeersDNS.DNSActions
import Ouroboros.Network.PeerSelection.RootPeersDNS.DNSSemaphore
import Ouroboros.Network.PeerSelection.RootPeersDNS.PublicRootPeers
import Ouroboros.Network.PeerSelection.State.EstablishedPeers qualified as EstablishedPeers
import Ouroboros.Network.PeerSelection.State.KnownPeers qualified as KnownPeers
import Ouroboros.Network.PeerSelection.State.LocalRootPeers (HotValency (..),
LocalRootPeers (..), WarmValency (..))
import Ouroboros.Network.PeerSelection.State.LocalRootPeers qualified as LocalRootPeers
import Ouroboros.Network.Protocol.PeerSharing.Type (PeerSharingResult (..))
import Ouroboros.Network.Testing.Data.Script
import Ouroboros.Network.Testing.Data.Signal (E (E), Events, Signal, TS (TS),
signalProperty)
import Ouroboros.Network.Testing.Data.Signal qualified as Signal
import Ouroboros.Network.Testing.Utils (disjointSetsProperty, isSubsetProperty,
nightlyTest)
import Test.Ouroboros.Network.PeerSelection.Instances
import Test.Ouroboros.Network.PeerSelection.MockEnvironment hiding (tests)
import Test.Ouroboros.Network.PeerSelection.PeerGraph
import Control.Monad.IOSim
import Test.QuickCheck
import Test.Tasty
import Test.Tasty.QuickCheck
import Text.Pretty.Simple
-- Exactly as named.
unfHydra :: Int
unfHydra = 1
tests :: TestTree
tests =
testGroup "Ouroboros.Network.PeerSelection"
[ testGroup "PeerSelectionView"
[ testProperty "sizes" prop_peerSelectionView_sizes
]
, testGroup "basic"
[ testProperty "has output" prop_governor_hasoutput
, testProperty "no failure" prop_governor_nofail
, testProperty "no livelock" prop_governor_nolivelock
]
-- The no livelock property is needed to ensure other tests terminate
, after AllSucceed "Ouroboros.Network.PeerSelection.basic" $
testGroup "safety"
[ testProperty "no excess busyness" prop_governor_nobusyness
, testProperty "event coverage" prop_governor_trace_coverage
, testProperty "connection status" prop_governor_connstatus
, testProperty "event number coverage" prop_governor_events_coverage
]
-- The no livelock property is needed to ensure other tests terminate
, after AllSucceed "Ouroboros.Network.PeerSelection.basic" $
testGroup "progress"
[ testGroup "ledger peers"
[ testProperty "progresses towards known target (from below)"
prop_governor_target_known_below
, testProperty "progresses towards known target (from above)"
prop_governor_target_known_above
, testProperty "progresses towards established target (from below)"
prop_governor_target_established_below
, testProperty "progresses towards established target (from above)"
prop_governor_target_established_above
, testProperty "progresses towards active target (from below)"
prop_governor_target_active_below
, testProperty "progresses towards active target (from above)"
prop_governor_target_active_above
]
, testGroup "public root peers"
[ testProperty "progresses towards target (from below)"
prop_governor_target_root_below
, testProperty "progresses towards established peers"
prop_governor_target_established_public
, testProperty "progresses towards active peers"
prop_governor_target_active_public
]
, testGroup "local root peers"
[ testProperty "progresses towards established target"
prop_governor_target_established_local
, testProperty "progresses towards active target (from below)"
prop_governor_target_active_local_below
, testProperty "progresses towards active target (from above)"
prop_governor_target_active_local_above
]
, testGroup "big ledger peers"
[ testProperty "progresses towards known target (from below)"
prop_governor_target_known_big_ledger_peers_below
, testProperty "progresses towards known target (from above)"
prop_governor_target_known_big_ledger_peers_above
, testProperty "progresses towards established target"
prop_governor_target_established_big_ledger_peers
, testProperty "progresses towards established target (from below)"
prop_governor_target_established_big_ledger_peers_below
, testProperty "progresses towards established target (from above)"
prop_governor_target_established_big_ledger_peers_above
, testProperty "progresses towards active target (from below)"
prop_governor_target_active_big_ledger_peers_below
, testProperty "progresses towards active target (from above)"
prop_governor_target_active_big_ledger_peers_above
]
, testGroup "bootstrap peers"
[ testProperty "progress towards only bootstrap peers after changing to fallback state"
prop_governor_only_bootstrap_peers_in_fallback_state
, testProperty "node does not learn about non trustable peers when in fallback state"
prop_governor_no_non_trustable_peers_before_caught_up_state
, testProperty "node only use bootstrap peers if in sensitive state"
prop_governor_stops_using_bootstrap_peers
, testProperty "node never uses non-trustable peers after clean state"
prop_governor_only_bootstrap_peers_after_clean_state
, testProperty "node uses ledger peers in non-sensitive mode"
prop_governor_uses_ledger_peers
]
]
, testGroup "issues"
[ testProperty "3233" prop_issue_3233
, testProperty "3494" prop_issue_3494
, testProperty "3515" prop_issue_3515
, testProperty "3550" prop_issue_3550
]
, testProperty "governor repromote delay with fuzz" prop_governor_repromote_delay
, testProperty "governor peer share reachable in 1hr" prop_governor_peershare_1hr
, testProperty "governor connection status" prop_governor_connstatus
, testProperty "governor no livelock" prop_governor_nolivelock
, testGroup "races"
[ nightlyTest $ testProperty "governor no livelock" $ prop_explore_governor_nolivelock
, nightlyTest $ testProperty "governor connection status" $ prop_explore_governor_connstatus
]
]
--TODO: We should add separate properties to check that we do not overshoot
-- our targets: known peers from below can overshoot, but all the others
-- should be precise and not overshoot. The public root target from below
-- is a one-sided target and we can and will overshoot, but we should not
-- overshoot by too much.
--
-- QuickCheck properties
--
prop_peerSelectionView_sizes :: GovernorMockEnvironment -> Property
prop_peerSelectionView_sizes env =
let trace = runGovernorInMockEnvironment env
evs = selectGovernorStateEvents
$ selectPeerSelectionTraceEventsUntil (Time (10 * 3600)) trace
in getAllProperty $
foldMap (\(_, TraceGovernorState _ _ st) ->
AllProperty $
let view = peerSelectionStateToView st in
viewInvariant (fst <$> view)
.&&. viewSizeInvariant view)
evs
where
viewInvariant :: PeerSelectionView (Set PeerAddr)
-> Property
viewInvariant PeerSelectionView {..} =
isSubsetProperty "viewActivePeersDemotions" viewActivePeersDemotions viewActivePeers
.&&. isSubsetProperty "viewActivePeers" viewActivePeers viewEstablishedPeers
.&&. isSubsetProperty "viewEstablishedPeers" viewEstablishedPeers viewKnownPeers
.&&. isSubsetProperty "viewColdPeersPromotions" viewColdPeersPromotions viewKnownPeers
.&&. isSubsetProperty "viewAvailableToConnectPeers" viewAvailableToConnectPeers viewKnownPeers
.&&. isSubsetProperty "viewWarmPeersDemotions" viewWarmPeersDemotions (viewEstablishedPeers Set.\\ viewActivePeers)
.&&. isSubsetProperty "viewWarmPeersPromotions" viewWarmPeersPromotions (viewEstablishedPeers Set.\\ viewActivePeers)
.&&. isSubsetProperty "viewActiveBigLedgerPeersDemotions" viewActiveBigLedgerPeersDemotions viewActiveBigLedgerPeers
.&&. isSubsetProperty "viewActiveBigLedgerPeers" viewActiveBigLedgerPeers viewEstablishedBigLedgerPeers
.&&. isSubsetProperty "viewEstablishedBigLedgerPeers" viewEstablishedBigLedgerPeers viewKnownBigLedgerPeers
.&&. isSubsetProperty "viewColdBigLedgerPeersPromotions" viewColdBigLedgerPeersPromotions viewKnownBigLedgerPeers
.&&. isSubsetProperty "viewAvailableToConnectBigLedgerPeers" viewAvailableToConnectBigLedgerPeers viewKnownBigLedgerPeers
.&&. isSubsetProperty "viewWarmBigLedgerPeersDemotions" viewWarmBigLedgerPeersDemotions (viewEstablishedBigLedgerPeers Set.\\ viewActiveBigLedgerPeers)
.&&. isSubsetProperty "viewWarmBigLedgerPeersPromotions" viewWarmBigLedgerPeersPromotions (viewEstablishedBigLedgerPeers Set.\\ viewActiveBigLedgerPeers)
.&&. isSubsetProperty "viewActiveLocalRootPeersDemotions" viewActiveLocalRootPeersDemotions viewActiveLocalRootPeers
.&&. isSubsetProperty "viewActiveLocalRootPeers" viewActiveLocalRootPeers viewEstablishedLocalRootPeers
.&&. isSubsetProperty "viewEstablishedLocalRootPeers" viewEstablishedLocalRootPeers viewKnownLocalRootPeers
.&&. isSubsetProperty "viewColdLocalRootPeersPromotions" viewColdLocalRootPeersPromotions viewKnownLocalRootPeers
.&&. isSubsetProperty "viewAvailableToConnectLocalRootPeers" viewAvailableToConnectLocalRootPeers viewKnownLocalRootPeers
.&&. isSubsetProperty "viewWarmLocalRootPeersPromotions" viewWarmLocalRootPeersPromotions (viewEstablishedLocalRootPeers Set.\\ viewActiveLocalRootPeers)
.&&. isSubsetProperty "viewActiveSharedPeersDemotions" viewActiveSharedPeersDemotions viewActiveSharedPeers
.&&. isSubsetProperty "viewActiveSharedPeers" viewActiveSharedPeers viewEstablishedSharedPeers
.&&. isSubsetProperty "viewEstablishedSharedPeers" viewEstablishedSharedPeers viewKnownSharedPeers
.&&. isSubsetProperty "viewColdSharedPeersPromotions" viewColdSharedPeersPromotions viewKnownSharedPeers
.&&. isSubsetProperty "viewWarmSharedPeersPromotions" viewWarmSharedPeersPromotions (viewEstablishedSharedPeers Set.\\ viewActiveSharedPeers)
.&&. isSubsetProperty "viewWarmSharedPeersDemotions" viewWarmSharedPeersDemotions (viewEstablishedSharedPeers Set.\\ viewActiveSharedPeers)
.&&. isSubsetProperty "viewActiveBootstrapPeersDemotions" viewActiveBootstrapPeersDemotions viewActiveBootstrapPeers
.&&. isSubsetProperty "viewActiveBootstrapPeers" viewActiveBootstrapPeers viewEstablishedBootstrapPeers
.&&. isSubsetProperty "viewEstablishedBootstrapPeers" viewEstablishedBootstrapPeers viewKnownBootstrapPeers
.&&. isSubsetProperty "viewColdBootstrapPeersPromotions" viewColdBootstrapPeersPromotions viewKnownBootstrapPeers
.&&. isSubsetProperty "viewWarmBootstrapPeersPromotions" viewWarmBootstrapPeersPromotions (viewEstablishedBootstrapPeers Set.\\ viewActiveBootstrapPeers)
.&&. isSubsetProperty "viewWarmBootstrapPeersDemotions" viewWarmBootstrapPeersDemotions (viewEstablishedBootstrapPeers Set.\\ viewActiveBootstrapPeers)
.&&. disjointSetsProperty "viewKnownPeers viewKnownBigLedgerPeers" viewKnownPeers viewKnownBigLedgerPeers
.&&. isSubsetProperty "viewKnownLocalRootPeers" viewKnownLocalRootPeers viewKnownPeers
.&&. isSubsetProperty "viewKnownSharedPeers" viewKnownSharedPeers viewKnownPeers
.&&. isSubsetProperty "viewKnownBootstrapPeers" viewKnownBootstrapPeers viewKnownPeers
.&&. disjointSetsProperty "viewKnownLocalRootPeers-viewKnownBigLedgerPeers" viewKnownLocalRootPeers viewKnownBigLedgerPeers
.&&. disjointSetsProperty "viewKnownLocalRootPeers-viewKnownSharedPeers" viewKnownLocalRootPeers viewKnownSharedPeers
.&&. disjointSetsProperty "viewKnownLocalRootPeers-viewKnownBootstrapPeers" viewKnownLocalRootPeers viewKnownBootstrapPeers
.&&. disjointSetsProperty "viewKnownSharedPeers-viewKnownBigLedgerPeers" viewKnownSharedPeers viewKnownBigLedgerPeers
.&&. disjointSetsProperty "viewKnownBootstrapPeers-viewKnownBigLedgerPeers" viewKnownBootstrapPeers viewKnownBigLedgerPeers
viewSizeInvariant :: PeerSelectionSetsWithSizes PeerAddr
-> Property
viewSizeInvariant PeerSelectionView {..} =
counterexample "viewRootPeers"
(Set.size (fst viewRootPeers) === snd viewRootPeers)
.&&. counterexample "viewKnownPeers"
(Set.size (fst viewKnownPeers) === snd viewKnownPeers)
.&&. counterexample "viewAvailableToConnectPeers"
(Set.size (fst viewAvailableToConnectPeers) === snd viewAvailableToConnectPeers)
.&&. counterexample "viewColdPeersPromotions"
(Set.size (fst viewColdPeersPromotions) === snd viewColdPeersPromotions)
.&&. counterexample "viewEstablishedPeers"
(Set.size (fst viewEstablishedPeers) === snd viewEstablishedPeers)
.&&. counterexample "viewWarmPeersDemotions"
(Set.size (fst viewWarmPeersDemotions) === snd viewWarmPeersDemotions)
.&&. counterexample "viewWarmPeersPromotions"
(Set.size (fst viewWarmPeersPromotions) === snd viewWarmPeersPromotions)
.&&. counterexample "viewActivePeers"
(Set.size (fst viewActivePeers) === snd viewActivePeers)
.&&. counterexample "viewActivePeersDemotions"
(Set.size (fst viewActivePeersDemotions) === snd viewActivePeersDemotions)
.&&. counterexample "viewKnownBigLedgerPeers"
(Set.size (fst viewKnownBigLedgerPeers) === snd viewKnownBigLedgerPeers)
.&&. counterexample "viewAvailableToConnectBigLedgerPeers"
(Set.size (fst viewAvailableToConnectBigLedgerPeers) === snd viewAvailableToConnectBigLedgerPeers)
.&&. counterexample "viewColdBigLedgerPeersPromotions"
(Set.size (fst viewColdBigLedgerPeersPromotions) === snd viewColdBigLedgerPeersPromotions)
.&&. counterexample "viewEstablishedBigLedgerPeers"
(Set.size (fst viewEstablishedBigLedgerPeers) === snd viewEstablishedBigLedgerPeers)
.&&. counterexample "viewWarmBigLedgerPeersDemotions"
(Set.size (fst viewWarmBigLedgerPeersDemotions) === snd viewWarmBigLedgerPeersDemotions)
.&&. counterexample "viewWarmBigLedgerPeersPromotions"
(Set.size (fst viewWarmBigLedgerPeersPromotions) === snd viewWarmBigLedgerPeersPromotions)
.&&. counterexample "viewActiveBigLedgerPeers"
(Set.size (fst viewActiveBigLedgerPeers) === snd viewActiveBigLedgerPeers)
.&&. counterexample "viewActiveBigLedgerPeersDemotions"
(Set.size (fst viewActiveBigLedgerPeersDemotions) === snd viewActiveBigLedgerPeersDemotions)
.&&. counterexample "viewKnownLocalRootPeers"
(Set.size (fst viewKnownLocalRootPeers) === snd viewKnownLocalRootPeers)
.&&. counterexample "viewAvailableToConnectLocalRootPeers"
(Set.size (fst viewAvailableToConnectLocalRootPeers) === snd viewAvailableToConnectLocalRootPeers)
.&&. counterexample "viewColdLocalRootPeersPromotions"
(Set.size (fst viewColdLocalRootPeersPromotions) === snd viewColdLocalRootPeersPromotions)
.&&. counterexample "viewEstablishedLocalRootPeers"
(Set.size (fst viewEstablishedLocalRootPeers) === snd viewEstablishedLocalRootPeers)
.&&. counterexample "viewWarmLocalRootPeersPromotions"
(Set.size (fst viewWarmLocalRootPeersPromotions) === snd viewWarmLocalRootPeersPromotions)
.&&. counterexample "viewActiveLocalRootPeers"
(Set.size (fst viewActiveLocalRootPeers) === snd viewActiveLocalRootPeers)
.&&. counterexample "viewActiveLocalRootPeersDemotions"
(Set.size (fst viewActiveLocalRootPeersDemotions) === snd viewActiveLocalRootPeersDemotions)
.&&. counterexample "viewKnownSharedPeers"
(Set.size (fst viewKnownSharedPeers) === snd viewKnownSharedPeers)
.&&. counterexample "viewColdSharedPeersPromotions"
(Set.size (fst viewColdSharedPeersPromotions) === snd viewColdSharedPeersPromotions)
.&&. counterexample "viewEstablishedSharedPeers"
(Set.size (fst viewEstablishedSharedPeers) === snd viewEstablishedSharedPeers)
.&&. counterexample "viewWarmSharedPeersDemotions"
(Set.size (fst viewWarmSharedPeersDemotions) === snd viewWarmSharedPeersDemotions)
.&&. counterexample "viewWarmSharedPeersPromotions"
(Set.size (fst viewWarmSharedPeersPromotions) === snd viewWarmSharedPeersPromotions)
.&&. counterexample "viewActiveSharedPeers"
(Set.size (fst viewActiveSharedPeers) === snd viewActiveSharedPeers)
.&&. counterexample "viewActiveSharedPeersDemotions"
(Set.size (fst viewActiveSharedPeersDemotions) === snd viewActiveSharedPeersDemotions)
.&&. counterexample "viewKnownBootstrapPeers"
(Set.size (fst viewKnownBootstrapPeers) === snd viewKnownBootstrapPeers)
.&&. counterexample "viewColdBootstrapPeersPromotions"
(Set.size (fst viewColdBootstrapPeersPromotions) === snd viewColdBootstrapPeersPromotions)
.&&. counterexample "viewEstablishedBootstrapPeers"
(Set.size (fst viewEstablishedBootstrapPeers) === snd viewEstablishedBootstrapPeers)
.&&. counterexample "viewWarmBootstrapPeersDemotions"
(Set.size (fst viewWarmBootstrapPeersDemotions) === snd viewWarmBootstrapPeersDemotions)
.&&. counterexample "viewWarmBootstrapPeersPromotions"
(Set.size (fst viewWarmBootstrapPeersPromotions) === snd viewWarmBootstrapPeersPromotions)
.&&. counterexample "viewActiveBootstrapPeers"
(Set.size (fst viewActiveBootstrapPeers) === snd viewActiveBootstrapPeers)
.&&. counterexample "viewActiveBootstrapPeersDemotions"
(Set.size (fst viewActiveBootstrapPeersDemotions) === snd viewActiveBootstrapPeersDemotions)
-- We start with basic properties in the style of "never does bad things"
-- and progress to properties that check that it "eventually does good things".
--
-- In the "never does bad things" category we have:
--
-- * A basic state space exploration property that checks we don't encounter
-- internal errors. This includes some limited checking that we get adequate
-- coverage of the different actions, by looking for coverage of all the
-- trace events. The coverage checks here are useful to give us confidence
-- about coverage for some of the other properties.
--
-- * A no-livelock property. This checks that the governor does not get stuck
-- doing too many steps at a single moment in (virtual) time. It's quite easy
-- to write bugs that don't cause the governor to fail, but cause it to go
-- into a busy cycle. See also the "no excessive busyness" property for a
-- more advanced version.
--
-- * A "no excessive busyness" property. This checks that the governor does not
-- remain too busy for too long. It's quite easy to write bugs that don't
-- cause the governor to fail, but cause it to go into fairly-busy cycles.
--
-- * A state consistency property that the governor's view of part of the state
-- and the "true" state of the mock environment are maintained in an
-- appropriate correspondence.
--
-- In the "eventually does good things" category we have:
--
-- * A basic property to check the governor does produce non-trivial traces.
--
-- * A cold peer peer sharing "reachable" property: that the governor either hits
-- its target for the number of cold peers, or finds all the reachable peers.
--
-- * A known peer target progress property: that the governor makes progress
-- within a bounded time towards its known peers target, from below and above.
--
-- * An established peer target property: the same as above but for established
-- peers.
--
-- * An active peer target property: the same as above but for active peers.
--
-- Properties that we would like to have:
--
-- * A public root peers target property: that the governor hits its target for
-- for the number of public root peers (or as near as possible), and does
-- not "grossly" overshoot. Since the public roots is a one sided target, but
-- we don't want to overshoot excessively.
--
-- * A local root peers target property: that the governor hits its target for
-- getting all its local root peers into the established state, and a target
-- number of them into the active state (or as near as possible).
--
-- Other properties we might like to think about
--
-- * time to find new nodes after a graph change is ok
-- * targets or root peer set dynamic
-- | As the most basic property we run the governor and check that it produces
-- any trace output at all. It should elicit some activity, unless the test
-- environment is actually empty.
--
prop_governor_hasoutput :: GovernorMockEnvironment -> Property
prop_governor_hasoutput env =
let trace = runGovernorInMockEnvironment env
evs = selectPeerSelectionTraceEvents trace
in counterexample (unlines ["\nSIM TRACE", ppTrace trace])
$ counterexample (unlines . ("EVENTS" :) . map show $ evs)
$ hasOutput env (selectGovernorEvents evs)
hasOutput :: GovernorMockEnvironment
-> [(Time, TracePeerSelection PeerAddr)]
-> Bool
hasOutput _ (_:_) = True
hasOutput env [] = isEmptyEnv env
isEmptyEnv :: GovernorMockEnvironment -> Bool
isEmptyEnv GovernorMockEnvironment {
localRootPeers,
publicRootPeers,
targets
} =
(LocalRootPeers.null localRootPeers
|| all (\(t,_) -> targetNumberOfKnownPeers t == 0) targets)
&& (PublicRootPeers.null publicRootPeers
|| all (\(t,_) -> targetNumberOfRootPeers t == 0) targets)
-- | As a basic property we run the governor to explore its state space a bit
-- and check it does not throw any exceptions (assertions such as invariant
-- violations).
--
-- We do /not/ assume freedom from livelock for this property, so we run the
-- governor for a maximum number of trace events rather than for a fixed
-- simulated time.
--
prop_governor_nofail :: GovernorMockEnvironment -> Property
prop_governor_nofail env =
let ioSimTrace = runGovernorInMockEnvironment env
trace = take 5000
. selectPeerSelectionTraceEvents
$ ioSimTrace
-- run in `IO` so we can catch the pure 'AssertionFailed' exception
in ioProperty $ do
r <-
evaluate ( foldl' (flip seq) True
$ [ assertPeerSelectionState st ()
| (_, GovernorDebug (TraceGovernorState _ _ st)) <- trace ]
)
`catch` \(AssertionFailed _) -> return False
case r of
True -> return $ property True
False -> do
bitraverse_ (putStrLn . show)
(putStrLn . ppSimEvent 20 20 20)
ioSimTrace
-- the ioSimTrace is infinite, but it will terminate with `AssertionFailed`
error "impossible!"
-- | It is relatively easy to write bugs where the governor is stuck in a tight
-- cycle of continuous activity. Due to the way the I\/O simulator manages
-- virtual time, these bugs exhibits themselves by infinite trace activity
-- without time advancing.
--
-- It is important to catch these bugs early in the set of tests, since it is
-- hard to write many of the other more interesting properties if there are
-- these kinds of livelock bugs. Or to put it another way, the other properties
-- can be expressed more simply if they can assume within event traces that the
-- time always advances after some finite number of events.
--
prop_governor_nolivelock :: GovernorMockEnvironment -> Property
prop_governor_nolivelock env =
check_governor_nolivelock 5000 $ runGovernorInMockEnvironment env
prop_explore_governor_nolivelock :: GovernorMockEnvironment -> Property
prop_explore_governor_nolivelock =
-- Simulation steps take longer and longer as simulated time
-- advances; running time for this property is quadratic in the
-- number of events explored. We limit the test to 500 governor
-- events to avoid unreasonably slow tests. This may be because
-- the governor becomes slower over time with priority-based
-- scheduling, or because IOSimPOR's data structures grow.
-- This test currently fails, because of a broken assertion in
-- Ouroboros.Network.PeerSelection.Governor.ActivePeers, which
-- checks that a newly promoted warm peer is a member of the set
-- of established peers. This may not be true if the promotion is
-- delayed by a race condition.
prop'_explore_governor_nolivelock id 500
prop'_explore_governor_nolivelock :: ExplorationSpec -> Int -> GovernorMockEnvironment -> Property
prop'_explore_governor_nolivelock spec len env =
exploreGovernorInMockEnvironment spec env $ \_ trace ->
-- counterexample (showTrace trace) $
-- whenfail (pPrint env) $
check_governor_nolivelock len trace
check_governor_nolivelock :: Int -> SimTrace a -> Property
check_governor_nolivelock n trace0 =
let trace = take n .
selectGovernorEvents .
selectPeerSelectionTraceEvents $
trace0
in case tooManyEventsBeforeTimeAdvances 1000 trace of
Nothing -> property True
Just (t, es) ->
counterexample
("over 1000 events at time: " ++ show t ++ "\n" ++
"first 50 events: " ++ (unlines . map show . take 50 $ es)) $
property False
{-
showTrace = break . show
where break s | "(Trace " `isPrefixOf` s = "\n" ++ breaks
| otherwise = breaks
where breaks | null s = []
| otherwise = head s : break (tail s)
-}
-- | Scan the trace and return any occurrence where we have at least threshold
-- events before virtual time moves on. Return the tail of the trace from that
-- point on.
--
tooManyEventsBeforeTimeAdvances :: Int -> [(Time, e)] -> Maybe (Time, [e])
tooManyEventsBeforeTimeAdvances _ [] = Nothing
tooManyEventsBeforeTimeAdvances threshold trace0 =
go [ (t, diffTime t' t, e)
| ((t, e), (t', _)) <- zip trace0 (tail trace0) ]
where
go [] = Nothing
go trace@((t,_,_):_) = case countdown threshold trace of
Just es' -> go es'
Nothing -> Just (t, trace')
where
trace' = take threshold [ e | (_,_,e) <- trace ]
countdown 0 _ = Nothing
countdown _ [] = Just []
countdown n ((_t,dt,_e):es)
| dt == 0 = countdown (n-1) es
| otherwise = Just es
-- | It is easy to get bugs where the governor is stuck in a cycle, working but
-- not making progress. This kind of bug would result in the governor thread
-- being excessively busy, so it might not be easily noticed.
--
-- This is more subtle and general than a simple livelock test that just checks
-- we don't get completely stuck. This property is about the possibility that
-- the governor is excessively busy over some period of time. This includes
-- "slow" livelocks where time advances during some of the steps in the cycle.
-- More interestingly this is also about a failure to converge and return to
-- being idle sufficiently quickly.
--
-- For example the governor could gets stuck in a cycle promoting and demoting
-- a peer once a second. In such a failure mode it will have a continuous level
-- of activity and will not return to being idle (perhaps ever or perhaps for
-- an extended period until some other environment perturbation gets us out of
-- the cycle).
--
-- The approach we take is based on the observation that the governor can
-- (quite reasonably) start with a big burst of activity (e.g. as it peer shares
-- to discover a big graph) but that in the long term it settles down and only
-- has small bursts of activity in reaction to perturbations in the environment
-- such as failures or changes in targets.
--
-- The approach we take is to look at spans of busy activity followed by
-- periods of idleness. If the spans of busy activity are too long then we
-- fail. So this counts the time of busyness not the number of events. We
-- account for activity in the environment that the governor needs to respond
-- to by counting \"perturbation credits"\: more credits means we allow longer
-- spans of busyness.
--
-- More specifically: we look at runs of events where the time between events
-- is less than a threshold. This implies there follows a threshold level of
-- idleness. Starting or within that run of events there can be environment
-- events. These are the perturbations from the environment that we expect to
-- trigger a series of responses from the governor. So we expect longer periods
-- of business for bigger perturbations. We sum all the perturbations credits
-- included in a run of events. We use a formula that relates the credits to
-- the permitted time span of the run. If the run is within the permitted time
-- span then it is ok, otherwise it is a failure (and the run is the
-- counterexample).
--
-- TODO: This test uses static root peers, but we should move to dynamic root
-- peers.
--
prop_governor_nobusyness :: GovernorMockEnvironment -> Property
prop_governor_nobusyness env =
let trace = selectPeerSelectionTraceEvents $
runGovernorInMockEnvironment env
in case tooBusyForTooLong (takeFirstNHours 10 trace) of
Nothing -> property True
Just (busyStartTime, busyEndTime, credits, trace') ->
counterexample
("busy span too long\n" ++
"start time: " ++ show busyStartTime ++ "\n" ++
"end time: " ++ show busyEndTime ++ "\n" ++
"span credits: " ++ show credits ++ "\n" ++
"first 50 events:\n" ++
(unlines . map show . take 50 $ trace')) $
property False
--
tooBusyForTooLong :: [(Time, TestTraceEvent)]
-> Maybe (Time, Time, DiffTime,
[(Time, TestTraceEvent)])
tooBusyForTooLong trace0 =
-- Pass in each timed event, with the diff-time to the next event
idle [ (t, diffTime t' t, e)
| ((t, e), (t', _)) <- zip trace0 (tail trace0) ]
where
-- How long between events before we say it's the end of a busy span
sameSpanThreshold :: DiffTime
sameSpanThreshold = 45
-- Starting credits for a busy span, even if there are no triggering
-- environment events. The value chosen here takes account of the normal
-- exponential backoff is 2+4+8+16+32 = 62, before a gap of 64 that's
-- bigger than the sameSpanThreshold of 45.
initialEventCredits :: DiffTime
initialEventCredits = 65
-- We process the event trace linearly, flipping between two states: idle
-- and busy. In the idle state, the next (non-debug) event flips us into
-- the busy state, starting with some minimal initial credits.
idle :: [(Time, DiffTime, TestTraceEvent)]
-> Maybe (Time, Time, DiffTime, [(Time, TestTraceEvent)])
idle [] = Nothing
idle ((_, _, GovernorDebug{}):trace') = idle trace'
idle trace@((busyStartTime,_,_):_) =
case busy busyStartTime initialEventCredits trace of
Right trace' -> idle trace'
Left (busyEndTime, credits) ->
Just (busyStartTime, busyEndTime, credits, trace')
where
trace' = [ (t, e)
| (t,_dt, e) <-
takeWhile (\(t,_,_) -> t <= busyEndTime) trace
, case e of
GovernorDebug{} -> False
_ -> True
]
busy :: Time -> DiffTime -> [(Time, DiffTime, TestTraceEvent)]
-> Either (Time, DiffTime) [(Time, DiffTime, TestTraceEvent)]
-- For normal governor events we check if the length of the busy time span
-- is now too big (adjusted for any perturbation credits). If so we've
-- found a violation.
busy !busyStartTime !credits ((busyEndTime, _dt, GovernorEvent{}) : _trace')
| busySpanLength > credits = Left (busyEndTime, credits)
where
busySpanLength = diffTime busyEndTime busyStartTime
-- We also look at how long it is to the next event to see if this is the
-- last event in the busy span, and if so we return to idle.
busy !_busyStartTime !_credits ((_t, dt, _event) : trace')
| dt > sameSpanThreshold = Right trace'
-- For environment events we calculate the perturbation credits this
-- contributes and add it to our running total.
busy !busyStartTime !credits ((_, _, MockEnvEvent e) : trace') =
busy busyStartTime (credits + fromIntegral (envEventCredits e)) trace'
-- Otherwise we move on to the next event, updating the length of this busy
-- time span.
busy !busyStartTime !credits (_ : trace') =
busy busyStartTime credits trace'
-- running out of events before we find a violation is ok
busy !_ !_ [] = Right []
envEventCredits :: TraceMockEnv -> Int
envEventCredits (TraceEnvAddPeers peerGraph) = 80 * 5 + length adjacency * 5
where
PeerGraph adjacency = peerGraph
envEventCredits (TraceEnvSetLocalRoots peers) = LocalRootPeers.size peers
envEventCredits (TraceEnvSetPublicRoots peers) = PublicRootPeers.size peers
envEventCredits TraceEnvRequestPublicRootPeers = 0
envEventCredits TraceEnvRequestBigLedgerPeers = 0
envEventCredits TraceEnvPublicRootTTL = 60
envEventCredits TraceEnvBigLedgerPeersTTL = 60
envEventCredits (TraceEnvSetTargets PeerSelectionTargets {
targetNumberOfRootPeers = _,
targetNumberOfKnownPeers,
targetNumberOfEstablishedPeers,
targetNumberOfActivePeers
}) = 80
+ 10 * (targetNumberOfKnownPeers
+ targetNumberOfEstablishedPeers
+ targetNumberOfActivePeers)
envEventCredits (TraceEnvPeersDemote Noop _) = 10
envEventCredits (TraceEnvPeersDemote ToWarm _) = 30
envEventCredits (TraceEnvPeersDemote ToCooling _) = 30
envEventCredits (TraceEnvPeersDemote ToCold _) = 30
envEventCredits TraceEnvPeersStatus{} = 0
-- These events can return emty results which will actually result in the governor
-- to issue more since it wasn't able to make progress towards the target.
-- However, the governor won't be making infinite requests, and ending up on a
-- livelock. Given this, in the case it doesn't manage to make
-- progress we give it a little bit of credits in order to account for the
-- next request.
--
envEventCredits TraceEnvPeerShareResult{} = 10
envEventCredits TraceEnvRootsResult{} = 10
envEventCredits TraceEnvBigLedgerPeersResult{} = 10
-- These events are visible in the environment but are the result of actions
-- initiated by the governor, hence they get no credit.
envEventCredits TraceEnvPeerShareRequest{} = 0
envEventCredits TraceEnvPeerShareTTL {} = 0
envEventCredits TraceEnvEstablishConn {} = 0
envEventCredits TraceEnvActivatePeer {} = 0
envEventCredits TraceEnvDeactivatePeer {} = 0
envEventCredits TraceEnvCloseConn {} = 0
envEventCredits TraceEnvSetLedgerStateJudgement {} = 30
envEventCredits TraceEnvSetUseBootstrapPeers {} = 30
-- | A coverage property that checks how many events are analysed when taking
-- up to 10h of execution time.
--
prop_governor_events_coverage :: GovernorMockEnvironment -> Property
prop_governor_events_coverage env =
let trace = Signal.eventsToList
. Signal.eventsFromListUpToTime (Time (10 * 60 * 60))
. selectPeerSelectionTraceEvents
. runGovernorInMockEnvironment
$ env
printLength x
| x < 10 = "# events < 10"
| x >= 10 && x < 100 = "# events >= 10 && < 100"
| x >= 100 && x < 1000 = "# events >= 100 && < 1000"
| x >= 1000 && x < 10000 = "# events >= 1000 && < 10000"
| x >= 10000 && x < 100000 = "# events >= 10000 && < 100000"
| x >= 100000 && x < 1000000 = "# events >= 100000 && < 1000000"
| otherwise = "# events >= 1000000"
in tabulate "# events" [printLength (length trace)]
True
-- | A coverage property, much like 'prop_governor_nofail' but we look to see
-- that we get adequate coverage of the state space. We look for all the trace
-- events that the governor can produce, and tabules which ones we see.
--
prop_governor_trace_coverage :: GovernorMockEnvironment -> Property
prop_governor_trace_coverage env =
let trace = take 5000 .
selectPeerSelectionTraceEvents $
runGovernorInMockEnvironment env
traceNumsSeen = collectTraces trace
traceNamesSeen = allTraceNames `Map.restrictKeys` traceNumsSeen
in coverTable "trace events" [ (n, 1) | n <- Map.elems allTraceNames ] $
tabulate "trace events" (Map.elems traceNamesSeen)
True
--TODO: use cover to check we do indeed get them all. There are a few
-- cases we do not cover yet. These should be fixed first.
collectTraces :: [(Time, TestTraceEvent)] -> Set Int
collectTraces trace =
Set.fromList [ traceNum e | (_, GovernorEvent e) <- trace ]
traceNum :: TracePeerSelection peeraddr -> Int
traceNum TraceLocalRootPeersChanged{} = 00
traceNum TraceTargetsChanged{} = 01
traceNum TracePublicRootsRequest{} = 02
traceNum TracePublicRootsResults{} = 03
traceNum TracePublicRootsFailure{} = 04
traceNum TracePeerShareRequests{} = 05
traceNum TracePeerShareResults{} = 06
traceNum TracePeerShareResultsFiltered{} = 07
traceNum TraceForgetColdPeers{} = 08
traceNum TracePromoteColdPeers{} = 09
traceNum TracePromoteColdLocalPeers{} = 10
traceNum TracePromoteColdFailed{} = 11
traceNum TracePromoteColdDone{} = 12
traceNum TracePromoteWarmPeers{} = 13
traceNum TracePromoteWarmLocalPeers{} = 14
traceNum TracePromoteWarmFailed{} = 15
traceNum TracePromoteWarmDone{} = 16
traceNum TraceDemoteWarmPeers{} = 17
traceNum TraceDemoteWarmFailed{} = 18
traceNum TraceDemoteWarmDone{} = 19
traceNum TraceDemoteHotPeers{} = 20
traceNum TraceDemoteLocalHotPeers{} = 21
traceNum TraceDemoteHotFailed{} = 22
traceNum TraceDemoteHotDone{} = 23
traceNum TraceDemoteAsynchronous{} = 24
traceNum TraceGovernorWakeup{} = 25
traceNum TraceChurnWait{} = 26
traceNum TraceChurnMode{} = 27
traceNum TracePromoteWarmAborted{} = 28
traceNum TraceDemoteLocalAsynchronous{} = 29
traceNum TraceBigLedgerPeersRequest{} = 30
traceNum TraceBigLedgerPeersResults{} = 31
traceNum TraceBigLedgerPeersFailure{} = 32
traceNum TraceForgetBigLedgerPeers{} = 33
traceNum TracePromoteColdBigLedgerPeers{} = 34
traceNum TracePromoteColdBigLedgerPeerFailed{} = 35
traceNum TracePromoteColdBigLedgerPeerDone{} = 36
traceNum TracePromoteWarmBigLedgerPeers{} = 37
traceNum TracePromoteWarmBigLedgerPeerFailed{} = 38
traceNum TracePromoteWarmBigLedgerPeerDone{} = 39
traceNum TracePromoteWarmBigLedgerPeerAborted{} = 40
traceNum TraceDemoteWarmBigLedgerPeers{} = 41
traceNum TraceDemoteWarmBigLedgerPeerFailed{} = 42
traceNum TraceDemoteWarmBigLedgerPeerDone{} = 43
traceNum TraceDemoteHotBigLedgerPeers{} = 44
traceNum TraceDemoteHotBigLedgerPeerFailed{} = 45
traceNum TraceDemoteHotBigLedgerPeerDone{} = 46
traceNum TraceKnownInboundConnection{} = 47
traceNum TraceDemoteBigLedgerPeersAsynchronous{} = 48
traceNum TraceLedgerStateJudgementChanged{} = 49
traceNum TraceOnlyBootstrapPeers{} = 50
traceNum TraceBootstrapPeersFlagChangedWhilstInSensitiveState = 51
traceNum TraceUseBootstrapPeersChanged {} = 52
traceNum TraceOutboundGovernorCriticalFailure {} = 53
traceNum TraceDebugState {} = 54
traceNum TraceChurnAction {} = 55
traceNum TraceChurnTimeout {} = 56
allTraceNames :: Map Int String
allTraceNames =
Map.fromList
[ (00, "TraceLocalRootPeersChanged")
, (01, "TraceTargetsChanged")
, (02, "TracePublicRootsRequest")
, (03, "TracePublicRootsResults")
, (04, "TracePublicRootsFailure")
, (05, "TracePeerShareRequests")
, (06, "TracePeerShareResults")
, (07, "TracePeerShareResultsFiltered")
, (08, "TraceForgetColdPeers")
, (09, "TracePromoteColdPeers")
, (10, "TracePromoteColdLocalPeers")
, (11, "TracePromoteColdFailed")
, (12, "TracePromoteColdDone")
, (13, "TracePromoteWarmPeers")
, (14, "TracePromoteWarmLocalPeers")
, (15, "TracePromoteWarmFailed")
, (16, "TracePromoteWarmDone")
, (17, "TraceDemoteWarmPeers")
, (18, "TraceDemoteWarmFailed")
, (19, "TraceDemoteWarmDone")
, (20, "TraceDemoteHotPeers")
, (21, "TraceDemoteLocalHotPeers")
, (22, "TraceDemoteHotFailed")
, (23, "TraceDemoteHotDone")
, (24, "TraceDemoteAsynchronous")
, (25, "TraceGovernorWakeup")
, (26, "TraceChurnWait")
, (27, "TraceChurnMode")
, (28, "TracePromoteWarmAborted")
, (29, "TraceDemoteAsynchronous")
, (30, "TraceBigLedgerPeersRequest")
, (31, "TraceBigLedgerPeersResults")
, (32, "TraceBigLedgerPeersFailure")
, (33, "TraceForgetBigLedgerPeers")
, (34, "TracePromoteColdBigLedgerPeers")
, (35, "TracePromoteColdBigLedgerPeerFailed")
, (36, "TracePromoteColdBigLedgerPeerDone")
, (37, "TracePromoteWarmBigLedgerPeers")
, (38, "TracePromoteWarmBigLedgerPeerFailed")
, (39, "TracePromoteWarmBigLedgerPeerDone")
, (40, "TracePromoteWarmBigLedgerPeerAborted")
, (41, "TraceDemoteWarmBigLedgerPeers")
, (42, "TraceDemoteWarmBigLedgerPeerFailed")
, (43, "TraceDemoteWarmBigLedgerPeerDone")
, (44, "TraceDemoteHotBigLedgerPeers")
, (45, "TraceDemoteHotBigLedgerPeerFailed")
, (46, "TraceDemoteHotBigLedgerPeerDone")
, (47, "TraceKnownInboundConnection")
, (48, "TraceDemoteBigLedgerPeersAsynchronous")
, (49, "TraceLedgerStateJudgementChanged")
, (50, "TraceOnlyBootstrapPeers")
, (51, "TraceBootstrapPeersFlagChangedWhilstInSensitiveState")
, (52, "TraceUseBootstrapPeersChanged")
, (53, "TraceOutboundGovernorCriticalFailure")
, (54, "TraceDebugState")
, (55, "TraceChurnAction")
, (56, "TraceChurnTimeout")
]
-- | Run the governor for up to 1 hour (simulated obviously) and look at the
-- set of known peers it has selected. This uses static targets and root peers.
--
-- As a basic correctness property, the peers the governor selects must be a
-- subset of those that are in principle reachable in the mock network
-- environment.
--
-- More interestingly, we expect the governor to find enough peers. However,
-- one can not test that it will find all reachable addresses, since we only
-- peer share with established peers and the mock environment might never promote
-- the peer that would allow us to reach every other peer.
--
prop_governor_peershare_1hr :: GovernorMockEnvironment -> Property
prop_governor_peershare_1hr env@GovernorMockEnvironment {
peerGraph,
localRootPeers,
publicRootPeers,
targets
} =
let ioSimTrace = runGovernorInMockEnvironment env {
targets = singletonScript (targets', NoDelay)
}
trace = selectPeerSelectionTraceEvents ioSimTrace
Just found = knownPeersAfter1Hour trace
reachable = peerShareReachablePeers peerGraph
(LocalRootPeers.keysSet localRootPeers <> PublicRootPeers.toSet publicRootPeers)
in counterexample ( intercalate "\n"
. map (ppSimEvent 20 20 20)
. takeWhile (\e -> seTime e <= Time (60*60))
. Trace.toList
$ ioSimTrace) $
subsetProperty found reachable
where
-- This test is only about testing peer sharing,
-- so do not try to establish connections:
targets' :: PeerSelectionTargets
targets' = fst (scriptHead targets)
knownPeersAfter1Hour :: [(Time, TestTraceEvent)] -> Maybe (Set PeerAddr)
knownPeersAfter1Hour trace =
listToMaybe
[ KnownPeers.toSet (Governor.knownPeers st)
| (_, GovernorDebug (TraceGovernorState _ _ st))
<- reverse (takeFirstNHours 1 trace)
]
-- The ones we find should be a subset of the ones possible to find
subsetProperty found reachable =
counterexample ("reachable: " ++ show reachable ++ "\n" ++
"found: " ++ show found) $
property (found `Set.isSubsetOf` reachable)
-- | Check the governor's view of connection status does not lag behind reality
-- by too much.
--
prop_governor_connstatus :: GovernorMockEnvironment -> Property
prop_governor_connstatus env =
check_governor_connstatus Nothing (runGovernorInMockEnvironment env)
-- The explore version of this property fails, I think because the
-- assumption made in the check that status events appear in the trace
-- in the correct order is broken by a race.
prop_explore_governor_connstatus :: GovernorMockEnvironment -> Property
prop_explore_governor_connstatus = prop'_explore_governor_connstatus id