github.com/onflow/flow-go@v0.35.7-crescendo-preview.23-atree-inlining/engine/consensus/message_hub/message_hub_test.go

package message_hub

import (
	"context"
	"sync"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/mock"
	"github.com/stretchr/testify/require"
	"github.com/stretchr/testify/suite"

	"github.com/onflow/flow-go/consensus/hotstuff/helper"
	hotstuff "github.com/onflow/flow-go/consensus/hotstuff/mocks"
	"github.com/onflow/flow-go/consensus/hotstuff/model"
	mockconsensus "github.com/onflow/flow-go/engine/consensus/mock"
	"github.com/onflow/flow-go/model/flow"
	"github.com/onflow/flow-go/model/messages"
	"github.com/onflow/flow-go/module/irrecoverable"
	"github.com/onflow/flow-go/module/metrics"
	module "github.com/onflow/flow-go/module/mock"
	"github.com/onflow/flow-go/module/util"
	netint "github.com/onflow/flow-go/network"
	"github.com/onflow/flow-go/network/channels"
	"github.com/onflow/flow-go/network/mocknetwork"
	protint "github.com/onflow/flow-go/state/protocol"
	protocol "github.com/onflow/flow-go/state/protocol/mock"
	storerr "github.com/onflow/flow-go/storage"
	storage "github.com/onflow/flow-go/storage/mock"
	"github.com/onflow/flow-go/utils/unittest"
)

func TestMessageHub(t *testing.T) {
	suite.Run(t, new(MessageHubSuite))
}

// MessageHubSuite tests the consensus message hub. Holds mocked dependencies that are used by different test scenarios.
type MessageHubSuite struct {
	suite.Suite

	// parameters
	participants flow.IdentityList
	myID         flow.Identifier
	head         *flow.Header

	// mocked dependencies
	payloads          *storage.Payloads
	me                *module.Local
	state             *protocol.State
	net               *mocknetwork.Network
	con               *mocknetwork.Conduit
	pushBlocksCon     *mocknetwork.Conduit
	hotstuff          *module.HotStuff
	voteAggregator    *hotstuff.VoteAggregator
	timeoutAggregator *hotstuff.TimeoutAggregator
	compliance        *mockconsensus.Compliance
	snapshot          *protocol.Snapshot

	ctx    irrecoverable.SignalerContext
	cancel context.CancelFunc
	errs   <-chan error
	hub    *MessageHub
}

func (s *MessageHubSuite) SetupTest() {
	// initialize the paramaters
	s.participants = unittest.IdentityListFixture(3,
		unittest.WithRole(flow.RoleConsensus),
		unittest.WithInitialWeight(1000),
	)
	s.myID = s.participants[0].NodeID
	block := unittest.BlockFixture()
	s.head = block.Header

	s.payloads = storage.NewPayloads(s.T())
	s.me = module.NewLocal(s.T())
	s.state = protocol.NewState(s.T())
	s.net = mocknetwork.NewNetwork(s.T())
	s.con = mocknetwork.NewConduit(s.T())
	s.pushBlocksCon = mocknetwork.NewConduit(s.T())
	s.hotstuff = module.NewHotStuff(s.T())
	s.voteAggregator = hotstuff.NewVoteAggregator(s.T())
	s.timeoutAggregator = hotstuff.NewTimeoutAggregator(s.T())
	s.compliance = mockconsensus.NewCompliance(s.T())

	// set up protocol state mock
	s.state.On("Final").Return(
		func() protint.Snapshot {
			return s.snapshot
		},
	).Maybe()
	s.state.On("AtBlockID", mock.Anything).Return(
		func(blockID flow.Identifier) protint.Snapshot {
			return s.snapshot
		},
	).Maybe()

	// set up local module mock
	s.me.On("NodeID").Return(
		func() flow.Identifier {
			return s.myID
		},
	).Maybe()

	// set up network module mock
	s.net.On("Register", mock.Anything, mock.Anything).Return(
		func(channel channels.Channel, engine netint.MessageProcessor) netint.Conduit {
			if channel == channels.ConsensusCommittee {
				return s.con
			} else if channel == channels.PushBlocks {
				return s.pushBlocksCon
			} else {
				s.T().Fail()
			}
			return nil
		},
		nil,
	)

	// set up protocol snapshot mock
	s.snapshot = &protocol.Snapshot{}
	s.snapshot.On("Identities", mock.Anything).Return(
		func(filter flow.IdentityFilter[flow.Identity]) flow.IdentityList {
			return s.participants.Filter(filter)
		},
		nil,
	)
	s.snapshot.On("Head").Return(
		func() *flow.Header {
			return s.head
		},
		nil,
	)

	engineMetrics := metrics.NewNoopCollector()
	hub, err := NewMessageHub(
		unittest.Logger(),
		engineMetrics,
		s.net,
		s.me,
		s.compliance,
		s.hotstuff,
		s.voteAggregator,
		s.timeoutAggregator,
		s.state,
		s.payloads,
	)
	require.NoError(s.T(), err)
	s.hub = hub

	s.ctx, s.cancel, s.errs = irrecoverable.WithSignallerAndCancel(context.Background())
	s.hub.Start(s.ctx)

	unittest.AssertClosesBefore(s.T(), s.hub.Ready(), time.Second)
}

// TearDownTest stops the hub and checks there are no errors thrown to the SignallerContext.
func (s *MessageHubSuite) TearDownTest() {
	s.cancel()
	unittest.RequireCloseBefore(s.T(), s.hub.Done(), time.Second, "hub failed to stop")
	select {
	case err := <-s.errs:
		assert.NoError(s.T(), err)
	default:
	}
}

// TestProcessIncomingMessages tests processing of incoming messages, MessageHub matches messages by type
// and sends them to other modules which execute business logic.
func (s *MessageHubSuite) TestProcessIncomingMessages() {
	var channel channels.Channel
	originID := unittest.IdentifierFixture()
	s.Run("to-compliance-engine", func() {
		block := unittest.BlockFixture()

		blockProposalMsg := messages.NewBlockProposal(&block)
		expectedComplianceMsg := flow.Slashable[*messages.BlockProposal]{
			OriginID: originID,
			Message:  blockProposalMsg,
		}
		s.compliance.On("OnBlockProposal", expectedComplianceMsg).Return(nil).Once()
		err := s.hub.Process(channel, originID, blockProposalMsg)
		require.NoError(s.T(), err)
	})
	s.Run("to-vote-aggregator", func() {
		expectedVote := unittest.VoteFixture(unittest.WithVoteSignerID(originID))
		msg := &messages.BlockVote{
			View:    expectedVote.View,
			BlockID: expectedVote.BlockID,
			SigData: expectedVote.SigData,
		}
		s.voteAggregator.On("AddVote", expectedVote)
		err := s.hub.Process(channel, originID, msg)
		require.NoError(s.T(), err)
	})
	s.Run("to-timeout-aggregator", func() {
		expectedTimeout := helper.TimeoutObjectFixture(helper.WithTimeoutObjectSignerID(originID))
		msg := &messages.TimeoutObject{
			View:       expectedTimeout.View,
			NewestQC:   expectedTimeout.NewestQC,
			LastViewTC: expectedTimeout.LastViewTC,
			SigData:    expectedTimeout.SigData,
		}
		s.timeoutAggregator.On("AddTimeout", expectedTimeout)
		err := s.hub.Process(channel, originID, msg)
		require.NoError(s.T(), err)
	})
	s.Run("unsupported-msg-type", func() {
		err := s.hub.Process(channel, originID, struct{}{})
		require.NoError(s.T(), err)
	})
}

// TestOnOwnProposal tests broadcasting proposals with different inputs
func (s *MessageHubSuite) TestOnOwnProposal() {
	// add execution node to participants to make sure we exclude them from broadcast
	s.participants = append(s.participants, unittest.IdentityFixture(unittest.WithRole(flow.RoleExecution)))

	// generate a parent with height and chain ID set
	parent := unittest.BlockHeaderFixture()
	parent.ChainID = "test"
	parent.Height = 10

	// create a block with the parent and store the payload with correct ID
	block := unittest.BlockWithParentFixture(parent)
	block.Header.ProposerID = s.myID

	s.payloads.On("ByBlockID", block.Header.ID()).Return(block.Payload, nil)
	s.payloads.On("ByBlockID", mock.Anything).Return(nil, storerr.ErrNotFound)

	s.Run("should fail with wrong proposer", func() {
		header := *block.Header
		header.ProposerID = unittest.IdentifierFixture()
		err := s.hub.sendOwnProposal(&header)
		require.Error(s.T(), err, "should fail with wrong proposer")
		header.ProposerID = s.myID
	})

	// should fail with wrong block ID (payload unavailable)
	s.Run("should fail with wrong block ID", func() {
		header := *block.Header
		header.View++
		err := s.hub.sendOwnProposal(&header)
		require.Error(s.T(), err, "should fail with missing payload")
		header.View--
	})

	s.Run("should broadcast proposal and pass to HotStuff for valid proposals", func() {
		expectedBroadcastMsg := messages.NewBlockProposal(block)

		submitted := make(chan struct{}) // closed when proposal is submitted to hotstuff
		hotstuffProposal := model.ProposalFromFlow(block.Header)
		s.voteAggregator.On("AddBlock", hotstuffProposal).Once()
		s.hotstuff.On("SubmitProposal", hotstuffProposal).
			Run(func(args mock.Arguments) { close(submitted) }).
			Once()

		broadcast := make(chan struct{}) // closed when proposal is broadcast
		s.con.On("Publish", expectedBroadcastMsg, s.participants[1].NodeID, s.participants[2].NodeID).
			Run(func(_ mock.Arguments) { close(broadcast) }).
			Return(nil).
			Once()

		s.pushBlocksCon.On("Publish", expectedBroadcastMsg, s.participants[3].NodeID).Return(nil)

		// submit to broadcast proposal
		s.hub.OnOwnProposal(block.Header, time.Now())

		unittest.AssertClosesBefore(s.T(), util.AllClosed(broadcast, submitted), time.Second)
	})
}

// TestProcessMultipleMessagesHappyPath tests submitting all types of messages through full processing pipeline and
// asserting that expected message transmissions happened as expected.
func (s *MessageHubSuite) TestProcessMultipleMessagesHappyPath() {
	var wg sync.WaitGroup

	// add execution node to participants to make sure we exclude them from broadcast
	s.participants = append(s.participants, unittest.IdentityFixture(unittest.WithRole(flow.RoleExecution)))

	s.Run("vote", func() {
		wg.Add(1)
		// prepare vote fixture
		vote := unittest.VoteFixture()
		recipientID := unittest.IdentifierFixture()
		s.con.On("Unicast", mock.Anything, recipientID).Run(func(_ mock.Arguments) {
			wg.Done()
		}).Return(nil)

		// submit vote
		s.hub.OnOwnVote(vote.BlockID, vote.View, vote.SigData, recipientID)
	})
	s.Run("timeout", func() {
		wg.Add(1)
		// prepare timeout fixture
		timeout := helper.TimeoutObjectFixture()
		expectedBroadcastMsg := &messages.TimeoutObject{
			View:       timeout.View,
			NewestQC:   timeout.NewestQC,
			LastViewTC: timeout.LastViewTC,
			SigData:    timeout.SigData,
		}
		s.con.On("Publish", expectedBroadcastMsg, s.participants[1].NodeID, s.participants[2].NodeID).
			Run(func(_ mock.Arguments) { wg.Done() }).
			Return(nil)
		s.timeoutAggregator.On("AddTimeout", timeout).Once()
		// submit timeout
		s.hub.OnOwnTimeout(timeout)
	})
	s.Run("proposal", func() {
		wg.Add(1)
		// prepare proposal fixture
		proposal := unittest.BlockWithParentAndProposerFixture(s.T(), s.head, s.myID)
		s.payloads.On("ByBlockID", proposal.Header.ID()).Return(proposal.Payload, nil)

		// unset chain and height to make sure they are correctly reconstructed
		hotstuffProposal := model.ProposalFromFlow(proposal.Header)
		s.voteAggregator.On("AddBlock", hotstuffProposal).Once()
		s.hotstuff.On("SubmitProposal", hotstuffProposal)
		expectedBroadcastMsg := messages.NewBlockProposal(&proposal)
		s.con.On("Publish", expectedBroadcastMsg, s.participants[1].NodeID, s.participants[2].NodeID).
			Run(func(_ mock.Arguments) { wg.Done() }).
			Return(nil)
		s.pushBlocksCon.On("Publish", expectedBroadcastMsg, s.participants[3].NodeID).Return(nil)

		// submit proposal
		s.hub.OnOwnProposal(proposal.Header, time.Now())
	})

	unittest.RequireReturnsBefore(s.T(), func() {
		wg.Wait()
	}, time.Second, "expect to process messages before timeout")
}