module

package
v0.29.17-consensus-fix Latest Latest
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 Go to latest Published: Apr 21, 2023 License: AGPL-3.0 Imports: 22 Imported by: 64

Documentation

Index

Constants

View Source 
const (
	ConsumeProgressVerificationBlockHeight = "ConsumeProgressVerificationBlockHeight"
	ConsumeProgressVerificationChunkIndex  = "ConsumeProgressVerificationChunkIndex"

	ConsumeProgressExecutionDataRequesterBlockHeight  = "ConsumeProgressExecutionDataRequesterBlockHeight"
	ConsumeProgressExecutionDataRequesterNotification = "ConsumeProgressExecutionDataRequesterNotification"
)

Variables

View Source 
var (
	// DKGFailError indicates that the node has completed DKG, but failed to genereate private key
	// in the given epoch
	DKGFailError = errors.New("dkg failed, no DKG private key generated")
)
View Source 
var ErrMultipleStartup = errors.New("component may only be started once")

Functions

This section is empty.

Types

type AccessMetrics added in v0.26.16 

type AccessMetrics interface {
	// TotalConnectionsInPool updates the number connections to collection/execution nodes stored in the pool, and the size of the pool
	TotalConnectionsInPool(connectionCount uint, connectionPoolSize uint)

	// ConnectionFromPoolReused tracks the number of times a connection to a collection/execution node is reused from the connection pool
	ConnectionFromPoolReused()

	// ConnectionAddedToPool tracks the number of times a collection/execution node is added to the connection pool
	ConnectionAddedToPool()

	// NewConnectionEstablished tracks the number of times a new grpc connection is established
	NewConnectionEstablished()

	// ConnectionFromPoolInvalidated tracks the number of times a cached grpc connection is invalidated and closed
	ConnectionFromPoolInvalidated()

	// ConnectionFromPoolUpdated tracks the number of times a cached connection is updated
	ConnectionFromPoolUpdated()

	// ConnectionFromPoolEvicted tracks the number of times a cached connection is evicted from the cache
	ConnectionFromPoolEvicted()
}

type BackendScriptsMetrics added in v0.26.1 

type BackendScriptsMetrics interface {
	// Record the round trip time while executing a script
	ScriptExecuted(dur time.Duration, size int)
}

type BitswapMetrics added in v0.27.3 

type BitswapMetrics interface {
	Peers(prefix string, n int)
	Wantlist(prefix string, n int)
	BlobsReceived(prefix string, n uint64)
	DataReceived(prefix string, n uint64)
	BlobsSent(prefix string, n uint64)
	DataSent(prefix string, n uint64)
	DupBlobsReceived(prefix string, n uint64)
	DupDataReceived(prefix string, n uint64)
	MessagesReceived(prefix string, n uint64)
}

type BlockRequester 

type BlockRequester interface {

	// RequestBlock indicates that the given block should be queued for retrieval.
	RequestBlock(blockID flow.Identifier, height uint64)

	// RequestHeight indicates that the given block height should be queued for retrieval.
	RequestHeight(height uint64)

	// Manually Prune requests
	Prune(final *flow.Header)
}

BlockRequester enables components to request particular blocks by ID from synchronization system.

type Builder 

type Builder interface {

	// BuildOn generates a new payload that is valid with respect to the parent
	// being built upon, with the view being provided by the consensus algorithm.
	// The builder stores the block and validates it against the protocol state
	// before returning it.
	//
	// NOTE: Since the block is stored within Builder, HotStuff MUST propose the
	// block once BuildOn succcessfully returns.
	BuildOn(parentID flow.Identifier, setter func(*flow.Header) error) (*flow.Header, error)
}

Builder represents an abstracted block construction module that can be used in more than one consensus algorithm. The resulting block is consistent within itself and can be wrapped with additional consensus information such as QCs.

type CacheMetrics 

type CacheMetrics interface {
	// CacheEntries report the total number of cached items
	CacheEntries(resource string, entries uint)
	// CacheHit report the number of times the queried item is found in the cache
	CacheHit(resource string)
	// CacheNotFound records the number of times the queried item was not found in either cache or database.
	CacheNotFound(resource string)
	// CacheMiss report the number of times the queried item is not found in the cache, but found in the database.
	CacheMiss(resource string)
}

type ChainSyncMetrics added in v0.27.0 

type ChainSyncMetrics interface {
	// record pruned blocks. requested and received times might be zero values
	PrunedBlockById(status *chainsync.Status)

	PrunedBlockByHeight(status *chainsync.Status)

	// totalByHeight and totalById are the number of blocks pruned for blocks requested by height and by id
	// storedByHeight and storedById are the number of blocks still stored by height and id
	PrunedBlocks(totalByHeight, totalById, storedByHeight, storedById int)

	RangeRequested(ran chainsync.Range)

	BatchRequested(batch chainsync.Batch)
}

type ChunkAssigner 

type ChunkAssigner interface {
	// Assign generates the assignment
	// error returns:
	//  * NoValidChildBlockError indicates that no valid child block is known
	//    (which contains the block's source of randomness)
	//  * unexpected errors should be considered symptoms of internal bugs
	Assign(result *flow.ExecutionResult, blockID flow.Identifier) (*chmodels.Assignment, error)
}

ChunkAssigner presents an interface for assigning chunks to the verifier nodes

type ChunkVerifier 

type ChunkVerifier interface {
	// Verify verifies the given VerifiableChunk by executing it and checking the final state commitment
	// It returns a Spock Secret as a byte array, verification fault of the chunk, and an error.
	// Note: Verify should only be executed on non-system chunks. It returns an error if it is invoked on
	// system chunk.
	// TODO return challenges plus errors
	Verify(ch *verification.VerifiableChunkData) ([]byte, chmodels.ChunkFault, error)

	// SystemChunkVerify verifies a given VerifiableChunk corresponding to a system chunk.
	// by executing it and checking the final state commitment
	// It returns a Spock Secret as a byte array, verification fault of the chunk, and an error.
	// Note: Verify should only be executed on system chunks. It returns an error if it is invoked on
	// non-system chunks.
	SystemChunkVerify(ch *verification.VerifiableChunkData) ([]byte, chmodels.ChunkFault, error)
}

ChunkVerifier provides functionality to verify chunks

type CleanerMetrics 

type CleanerMetrics interface {
	RanGC(took time.Duration)
}

type ClusterRootQCVoter 

type ClusterRootQCVoter interface {

	// Vote handles the full procedure of generating a vote, submitting it to the epoch
	// smart contract, and verifying submission. It is safe to run Vote multiple
	// times within a single setup phase.
	// Error returns:
	//   - epochs.ClusterQCNoVoteError if we fail to vote for a benign reason
	//   - generic error in case of critical unexpected failure
	Vote(context.Context, protocol.Epoch) error
}

ClusterRootQCVoter is responsible for submitting a vote to the cluster QC contract to coordinate generation of a valid root quorum certificate for the next epoch.

type CollectionMetrics 

type CollectionMetrics interface {
	// TransactionIngested is called when a new transaction is ingested by the
	// node. It increments the total count of ingested transactions and starts
	// a tx->col span for the transaction.
	TransactionIngested(txID flow.Identifier)

	// ClusterBlockProposed is called when a new collection is proposed by us or
	// any other node in the cluster.
	ClusterBlockProposed(block *cluster.Block)

	// ClusterBlockFinalized is called when a collection is finalized.
	ClusterBlockFinalized(block *cluster.Block)
}

type ComplianceMetrics 

type ComplianceMetrics interface {
	FinalizedHeight(height uint64)
	CommittedEpochFinalView(view uint64)
	SealedHeight(height uint64)
	BlockFinalized(*flow.Block)
	BlockSealed(*flow.Block)
	CurrentEpochCounter(counter uint64)
	CurrentEpochPhase(phase flow.EpochPhase)
	CurrentEpochFinalView(view uint64)
	CurrentDKGPhase1FinalView(view uint64)
	CurrentDKGPhase2FinalView(view uint64)
	CurrentDKGPhase3FinalView(view uint64)
	EpochEmergencyFallbackTriggered()
}

type ConsensusMetrics 

type ConsensusMetrics interface {
	// StartCollectionToFinalized reports Metrics C1: Collection Received by CCL→ Collection Included in Finalized Block
	StartCollectionToFinalized(collectionID flow.Identifier)

	// FinishCollectionToFinalized reports Metrics C1: Collection Received by CCL→ Collection Included in Finalized Block
	FinishCollectionToFinalized(collectionID flow.Identifier)

	// StartBlockToSeal reports Metrics C4: Block Received by CCL → Block Seal in finalized block
	StartBlockToSeal(blockID flow.Identifier)

	// FinishBlockToSeal reports Metrics C4: Block Received by CCL → Block Seal in finalized block
	FinishBlockToSeal(blockID flow.Identifier)

	// EmergencySeal increments the number of seals that were created in emergency mode
	EmergencySeal()

	// OnReceiptProcessingDuration records the number of seconds spent processing a receipt
	OnReceiptProcessingDuration(duration time.Duration)

	// OnApprovalProcessingDuration records the number of seconds spent processing an approval
	OnApprovalProcessingDuration(duration time.Duration)

	// CheckSealingDuration records absolute time for the full sealing check by the consensus match engine
	CheckSealingDuration(duration time.Duration)
}

type DHTMetrics added in v0.26.11 

type DHTMetrics interface {
	RoutingTablePeerAdded()
	RoutingTablePeerRemoved()
}

type DKGContractClient added in v0.22.4 

type DKGContractClient interface {

	// Broadcast broadcasts a message to all other nodes participating in the
	// DKG. The message is broadcast by submitting a transaction to the DKG
	// smart contract. An error is returned if the transaction has failed has
	// failed.
	// TBD: retry logic
	Broadcast(msg messages.BroadcastDKGMessage) error

	// ReadBroadcast reads the broadcast messages from the smart contract.
	// Messages are returned in the order in which they were broadcast (received
	// and stored in the smart contract). The parameters are:
	//
	// * fromIndex: return messages with index >= fromIndex
	// * referenceBlock: a marker for the state against which the query should
	//   be executed
	//
	// DKG nodes should call ReadBroadcast one final time once they have
	// observed the phase deadline trigger to guarantee they receive all
	// messages for that phase.
	ReadBroadcast(fromIndex uint, referenceBlock flow.Identifier) ([]messages.BroadcastDKGMessage, error)

	// SubmitResult submits the final public result of the DKG protocol. This
	// represents the group public key and the node's local computation of the
	// public keys for each DKG participant.
	//
	// SubmitResult must be called strictly after the final phase has ended.
	SubmitResult(crypto.PublicKey, []crypto.PublicKey) error
}

DKGContractClient enables interacting with the DKG smart contract. This contract is deployed to the service account as part of a collection of smart contracts that facilitate and manage epoch transitions.

type DKGController added in v0.22.4 

type DKGController interface {

	// Run starts the DKG controller and starts phase 1. It is a blocking call
	// that blocks until the controller is shutdown or until an error is
	// encountered in one of the protocol phases.
	Run() error

	// EndPhase1 notifies the controller to end phase 1, and start phase 2.
	EndPhase1() error

	// EndPhase2 notifies the controller to end phase 2, and start phase 3.
	EndPhase2() error

	// End terminates the DKG state machine and records the artifacts.
	End() error

	// Shutdown stops the controller regardless of the current state.
	Shutdown()

	// Poll instructs the controller to actively fetch broadcast messages (ex.
	// read from DKG smart contract). The method does not return until all
	// received messages are processed.
	Poll(blockReference flow.Identifier) error

	// GetArtifacts returns our node's private key share, the group public key,
	// and the list of all nodes' public keys (including ours), as computed by
	// the DKG.
	GetArtifacts() (crypto.PrivateKey, crypto.PublicKey, []crypto.PublicKey)

	// GetIndex returns the index of this node in the DKG committee list.
	GetIndex() int

	// SubmitResult instructs the broker to publish the results of the DKG run
	// (ex. publish to DKG smart contract).
	SubmitResult() error
}

DKGController controls the execution of a Joint Feldman DKG instance.

type DKGControllerFactory added in v0.22.4 

type DKGControllerFactory interface {

	// Create instantiates a new DKGController.
	Create(dkgInstanceID string, participants flow.IdentityList, seed []byte) (DKGController, error)
}

DKGControllerFactory is a factory to create instances of DKGController.

type EngineMetrics 

type EngineMetrics interface {
	// MessageSent reports that the engine transmitted the message over the network.
	// Unicasts, broadcasts, and multicasts are all reported once.
	MessageSent(engine string, message string)
	// MessageReceived reports that the engine received the message over the network.
	MessageReceived(engine string, message string)
	// MessageHandled reports that the engine has finished processing the message.
	// Both invalid and valid messages should be reported.
	// A message must be reported as either handled or dropped, not both.
	MessageHandled(engine string, messages string)
	// InboundMessageDropped reports that the engine has dropped inbound message without processing it.
	// Inbound messages must be reported as either handled or dropped, not both.
	InboundMessageDropped(engine string, messages string)
	// OutboundMessageDropped reports that the engine has dropped outbound message without processing it.
	// Outbound messages must be reported as either sent or dropped, not both.
	OutboundMessageDropped(engine string, messages string)
}

EngineMetrics is a generic metrics consumer for node-internal data processing components (aka engines). Implementations must be non-blocking and concurrency safe.

type EntriesFunc added in v0.14.6 

type EntriesFunc func() uint

type EpochLookup added in v0.20.0 

type EpochLookup interface {

	// EpochForViewWithFallback returns the counter of the epoch that the input view belongs to.
	// If epoch fallback has been triggered, returns the last committed epoch counter
	// in perpetuity for any inputs beyond the last committed epoch view range.
	// For example, if we trigger epoch fallback during epoch 10, and reach the final
	// view of epoch 10 before epoch 11 has finished being setup, this function will
	// return 10 even for input views beyond the final view of epoch 10.
	//
	// Returns model.ErrViewForUnknownEpoch if the input does not fall within the range of a known epoch.
	EpochForViewWithFallback(view uint64) (epochCounter uint64, err error)
}

EpochLookup enables looking up epochs by view.

type ExecutionDataProviderMetrics added in v0.27.2 

type ExecutionDataProviderMetrics interface {
	RootIDComputed(duration time.Duration, numberOfChunks int)
	AddBlobsSucceeded(duration time.Duration, totalSize uint64)
	AddBlobsFailed()
}

type ExecutionDataPrunerMetrics added in v0.27.2 

type ExecutionDataPrunerMetrics interface {
	Pruned(height uint64, duration time.Duration)
}

type ExecutionDataRequesterMetrics added in v0.26.2 

type ExecutionDataRequesterMetrics interface {
	// ExecutionDataFetchStarted records an in-progress download
	ExecutionDataFetchStarted()

	// ExecutionDataFetchFinished records a completed download
	ExecutionDataFetchFinished(duration time.Duration, success bool, height uint64)

	// NotificationSent reports that ExecutionData received notifications were sent for a block height
	NotificationSent(height uint64)

	// FetchRetried reports that a download retry was processed
	FetchRetried()
}

type ExecutionDataRequesterV2Metrics added in v0.27.2 

type ExecutionDataRequesterV2Metrics interface {
	FulfilledHeight(blockHeight uint64)
	ReceiptSkipped()
	RequestSucceeded(blockHeight uint64, duration time.Duration, totalSize uint64, numberOfAttempts int)
	RequestFailed(duration time.Duration, retryable bool)
	RequestCanceled()
	ResponseDropped()
}

type ExecutionMetrics 

type ExecutionMetrics interface {
	LedgerMetrics
	RuntimeMetrics
	ProviderMetrics
	WALMetrics

	// StartBlockReceivedToExecuted starts a span to trace the duration of a block
	// from being received for execution to execution being finished
	StartBlockReceivedToExecuted(blockID flow.Identifier)

	// FinishBlockReceivedToExecuted finishes a span to trace the duration of a block
	// from being received for execution to execution being finished
	FinishBlockReceivedToExecuted(blockID flow.Identifier)

	// ExecutionStorageStateCommitment reports the storage size of a state commitment in bytes
	ExecutionStorageStateCommitment(bytes int64)

	// ExecutionLastExecutedBlockHeight reports last executed block height
	ExecutionLastExecutedBlockHeight(height uint64)

	// ExecutionBlockExecuted reports the total time and computation spent on executing a block
	ExecutionBlockExecuted(dur time.Duration, stats ExecutionResultStats)

	// ExecutionBlockExecutionEffortVectorComponent reports the unweighted effort of given ComputationKind at block level
	ExecutionBlockExecutionEffortVectorComponent(string, uint)

	// ExecutionBlockCachedPrograms reports the number of cached programs at the end of a block
	ExecutionBlockCachedPrograms(programs int)

	// ExecutionCollectionExecuted reports the total time and computation spent on executing a collection
	ExecutionCollectionExecuted(dur time.Duration, stats ExecutionResultStats)

	// ExecutionTransactionExecuted reports stats on executing a single transaction
	ExecutionTransactionExecuted(dur time.Duration,
		compUsed, memoryUsed, actualMemoryUsed uint64,
		eventCounts, eventSize int,
		failed bool)

	// ExecutionChunkDataPackGenerated reports stats on chunk data pack generation
	ExecutionChunkDataPackGenerated(proofSize, numberOfTransactions int)

	// ExecutionScriptExecuted reports the time and memory spent on executing an script
	ExecutionScriptExecuted(dur time.Duration, compUsed, memoryUsed, memoryEstimate uint64)

	// ExecutionCollectionRequestSent reports when a request for a collection is sent to a collection node
	ExecutionCollectionRequestSent()

	// Unused
	ExecutionCollectionRequestRetried()

	// ExecutionSync reports when the state syncing is triggered or stopped.
	ExecutionSync(syncing bool)

	// Upload metrics
	ExecutionBlockDataUploadStarted()
	ExecutionBlockDataUploadFinished(dur time.Duration)
	ExecutionComputationResultUploaded()
	ExecutionComputationResultUploadRetried()

	UpdateCollectionMaxHeight(height uint64)
}

type ExecutionResultStats added in v0.29.0 

type ExecutionResultStats struct {
	ComputationUsed                 uint64
	MemoryUsed                      uint64
	EventCounts                     int
	EventSize                       int
	NumberOfRegistersTouched        int
	NumberOfBytesWrittenToRegisters int
	NumberOfCollections             int
	NumberOfTransactions            int
}

func (*ExecutionResultStats) Merge added in v0.29.0 

func (stats *ExecutionResultStats) Merge(other ExecutionResultStats)

type Finalizer 

type Finalizer interface {

	// MakeFinal will declare a block and all of its ancestors as finalized, which
	// makes it an immutable part of the blockchain. Returning an error indicates
	// some fatal condition and will cause the finalization logic to terminate.
	MakeFinal(blockID flow.Identifier) error
}

Finalizer is used by the consensus algorithm to inform other components for (such as the protocol state) about finalization of blocks.

Since we have two different protocol states: one for the main consensus, the other for the collection cluster consensus, the Finalizer interface allows the two different protocol states to provide different implementations for updating its state when a block has been finalized.

Updating the protocol state should always succeed when the data is consistent. However, in case the protocol state is corrupted, error should be returned and the consensus algorithm should halt. So the error returned from MakeFinal is for the protocol state to report exceptions.

type GossipSubRouterMetrics added in v0.29.0 

type GossipSubRouterMetrics interface {
	// OnIncomingRpcAcceptedFully tracks the number of RPC messages received by the node that are fully accepted.
	// An RPC may contain any number of control messages, i.e., IHAVE, IWANT, GRAFT, PRUNE, as well as the actual messages.
	// A fully accepted RPC means that all the control messages are accepted and all the messages are accepted.
	OnIncomingRpcAcceptedFully()

	// OnIncomingRpcAcceptedOnlyForControlMessages tracks the number of RPC messages received by the node that are accepted
	// only for the control messages, i.e., only for the included IHAVE, IWANT, GRAFT, PRUNE. However, the actual messages
	// included in the RPC are not accepted.
	// This happens mostly when the validation pipeline of GossipSub is throttled, and cannot accept more actual messages for
	// validation.
	OnIncomingRpcAcceptedOnlyForControlMessages()

	// OnIncomingRpcRejected tracks the number of RPC messages received by the node that are rejected.
	// This happens mostly when the RPC is coming from a low-scored peer based on the peer scoring module of GossipSub.
	OnIncomingRpcRejected()

	// OnIWantReceived tracks the number of IWANT messages received by the node from other nodes over an RPC message.
	// iWant is a control message that is sent by a node to request a message that it has seen advertised in an iHAVE message.
	OnIWantReceived(count int)

	// OnIHaveReceived tracks the number of IHAVE messages received by the node from other nodes over an RPC message.
	// iHave is a control message that is sent by a node to another node to indicate that it has a new gossiped message.
	OnIHaveReceived(count int)

	// OnGraftReceived tracks the number of GRAFT messages received by the node from other nodes over an RPC message.
	// GRAFT is a control message of GossipSub protocol that connects two nodes over a topic directly as gossip partners.
	OnGraftReceived(count int)

	// OnPruneReceived tracks the number of PRUNE messages received by the node from other nodes over an RPC message.
	// PRUNE is a control message of GossipSub protocol that disconnects two nodes over a topic.
	OnPruneReceived(count int)

	// OnPublishedGossipMessagesReceived tracks the number of gossip messages received by the node from other nodes over an
	// RPC message.
	OnPublishedGossipMessagesReceived(count int)
}

GossipSubRouterMetrics encapsulates the metrics collectors for GossipSubRouter module of the networking layer. It mostly collects the metrics related to the control message exchange between nodes over the GossipSub protocol.

type HeroCacheMetrics added in v0.25.2 

type HeroCacheMetrics interface {
	// BucketAvailableSlots keeps track of number of available slots in buckets of cache.
	BucketAvailableSlots(uint64, uint64)

	// OnKeyPutAttempt is called whenever a new (key, value) pair is attempted to be put in cache.
	// It does not reflect whether the put was successful or not.
	// A (key, value) pair put attempt may fail if the cache is full, or the key already exists.
	OnKeyPutAttempt(size uint32)

	// OnKeyPutSuccess is called whenever a new (key, entity) pair is successfully added to the cache.
	OnKeyPutSuccess(size uint32)

	// OnKeyPutDrop is called whenever a new (key, entity) pair is dropped from the cache due to full cache.
	OnKeyPutDrop()

	// OnKeyPutDeduplicated is tracking the total number of unsuccessful writes caused by adding a duplicate key to the cache.
	// A duplicate key is dropped by the cache when it is written to the cache.
	// Note: in context of HeroCache, the key corresponds to the identifier of its entity. Hence, a duplicate key corresponds to
	// a duplicate entity.
	OnKeyPutDeduplicated()

	// OnKeyRemoved is called whenever a (key, entity) pair is removed from the cache.
	OnKeyRemoved(size uint32)

	// OnKeyGetSuccess tracks total number of successful read queries.
	// A read query is successful if the entity corresponding to its key is available in the cache.
	// Note: in context of HeroCache, the key corresponds to the identifier of its entity.
	OnKeyGetSuccess()

	// OnKeyGetFailure tracks total number of unsuccessful read queries.
	// A read query is unsuccessful if the entity corresponding to its key is not available in the cache.
	// Note: in context of HeroCache, the key corresponds to the identifier of its entity.
	OnKeyGetFailure()

	// OnEntityEjectionDueToFullCapacity is called whenever adding a new (key, entity) to the cache results in ejection of another (key', entity') pair.
	// This normally happens -- and is expected -- when the cache is full.
	// Note: in context of HeroCache, the key corresponds to the identifier of its entity.
	OnEntityEjectionDueToFullCapacity()

	// OnEntityEjectionDueToEmergency is called whenever a bucket is found full and all of its keys are valid, i.e.,
	// each key belongs to an existing (key, entity) pair.
	// Hence, adding a new key to that bucket will replace the oldest valid key inside that bucket.
	// Note: in context of HeroCache, the key corresponds to the identifier of its entity.
	OnEntityEjectionDueToEmergency()
}

type HotStuff 

type HotStuff interface {
	ReadyDoneAware
	Startable

	// SubmitProposal submits a new block proposal to the HotStuff event loop.
	// This method blocks until the proposal is accepted to the event queue.
	//
	// Block proposals must be submitted in order and only if they extend a
	// block already known to HotStuff core.
	SubmitProposal(proposal *model.Proposal)
}

HotStuff defines the interface to the core HotStuff algorithm. It includes a method to start the event loop, and utilities to submit block proposals received from other replicas.

type HotStuffFollower 

type HotStuffFollower interface {
	ReadyDoneAware
	Startable

	// SubmitProposal feeds a new block proposal into the HotStuffFollower.
	// This method blocks until the proposal is accepted to the event queue.
	//
	// Block proposals must be submitted in order, i.e. a proposal's parent must
	// have been previously processed by the HotStuffFollower.
	SubmitProposal(proposal *model.Proposal)
}

HotStuffFollower is run by non-consensus nodes to observe the block chain and make local determination about block finalization. While the process of reaching consensus (while guaranteeing its safety and liveness) is very intricate, the criteria to confirm that consensus has been reached are relatively straight forward. Each non-consensus node can simply observe the blockchain and determine locally which blocks have been finalized without requiring additional information from the consensus nodes.

Specifically, the HotStuffFollower informs other components within the node about finalization of blocks. It consumes block proposals broadcasted by the consensus node, verifies the block header and locally evaluates the finalization rules.

Notes:

  • HotStuffFollower does not handle disconnected blocks. Each block's parent must have been previously processed by the HotStuffFollower.
  • HotStuffFollower internally prunes blocks below the last finalized view. When receiving a block proposal, it might not have the proposal's parent anymore. Nevertheless, HotStuffFollower needs the parent's view, which must be supplied in addition to the proposal.

type HotstuffMetrics 

type HotstuffMetrics interface {
	// HotStuffBusyDuration reports Metrics C6 HotStuff Busy Duration
	HotStuffBusyDuration(duration time.Duration, event string)

	// HotStuffIdleDuration reports Metrics C6 HotStuff Idle Duration
	HotStuffIdleDuration(duration time.Duration)

	// HotStuffWaitDuration reports Metrics C6 HotStuff Idle Duration - the time between receiving and
	// enqueueing a message to beginning to process that message.
	HotStuffWaitDuration(duration time.Duration, event string)

	// SetCurView reports Metrics C8: Current View maintained by Pacemaker.
	SetCurView(view uint64)

	// SetQCView reports Metrics C9: View of the newest QC known to Pacemaker.
	SetQCView(view uint64)

	// SetTCView reports last TC known to Pacemaker.
	SetTCView(view uint64)

	// CountSkipped counts the number of skips we did.
	CountSkipped()

	// CountTimeout tracks the number of views that this replica left due to observing a TC.
	CountTimeout()

	// SetTimeout sets the current timeout duration
	SetTimeout(duration time.Duration)

	// BlockProcessingDuration measures the time which the compliance engine
	// spends to process one block proposal.
	BlockProcessingDuration(duration time.Duration)

	// VoteProcessingDuration measures the time which the hotstuff.VoteAggregator
	// spends to process one vote.
	VoteProcessingDuration(duration time.Duration)

	// TimeoutObjectProcessingDuration measures the time which the hotstuff.TimeoutAggregator
	// spends to process one timeout object.
	TimeoutObjectProcessingDuration(duration time.Duration)

	// CommitteeProcessingDuration measures the time which the HotStuff's core logic
	// spends in the hotstuff.Replicas component, i.e. the time determining consensus
	// committee relations.
	CommitteeProcessingDuration(duration time.Duration)

	// SignerProcessingDuration measures the time which the HotStuff's core logic
	// spends in the hotstuff.Signer component, i.e. the with crypto-related operations.
	SignerProcessingDuration(duration time.Duration)

	// ValidatorProcessingDuration measures the time which the HotStuff's core logic
	// spends in the hotstuff.Validator component, i.e. the with verifying
	// consensus messages.
	ValidatorProcessingDuration(duration time.Duration)

	// PayloadProductionDuration measures the time which the HotStuff's core logic
	// spends in the module.Builder component, i.e. the with generating block payloads.
	PayloadProductionDuration(duration time.Duration)
}

type IdentifierProvider added in v0.28.0 

type IdentifierProvider interface {
	Identifiers() flow.IdentifierList
}

IdentifierProvider provides an interface to get a list of Identifiers representing a specific set of nodes in the network.

type IdentityProvider added in v0.28.0 

type IdentityProvider interface {
	// Identities returns the full identities of _all_ nodes currently known to the
	// protocol that pass the provided filter. Caution, this includes ejected nodes.
	// Please check the `Ejected` flag in the identities (or provide a filter for
	// removing ejected nodes).
	Identities(flow.IdentityFilter) flow.IdentityList

	// ByNodeID returns the full identity for the node with the given Identifier,
	// where Identifier is the way the protocol refers to the node. The function
	// has the same semantics as a map lookup, where the boolean return value is
	// true if and only if Identity has been found, i.e. `Identity` is not nil.
	// Caution: function returns include ejected nodes. Please check the `Ejected`
	// flag in the identity.
	ByNodeID(flow.Identifier) (*flow.Identity, bool)

	// ByPeerID returns the full identity for the node with the given peer ID,
	// where ID is the way the libP2P refers to the node. The function
	// has the same semantics as a map lookup, where the boolean return value is
	// true if and only if Identity has been found, i.e. `Identity` is not nil.
	// Caution: function returns include ejected nodes. Please check the `Ejected`
	// flag in the identity.
	ByPeerID(peer.ID) (*flow.Identity, bool)
}

IdentityProvider provides an interface to get a list of Identities representing the set of participants in the Flow protocol. CAUTION: return values will include ejected nodes, so callers must check the `Identity.Ejected` flag.

type Job added in v0.15.0 

type Job interface {
	// each job has a unique ID for deduplication
	ID() JobID
}

type JobConsumer added in v0.15.0 

type JobConsumer interface {
	NewJobListener

	// Start starts processing jobs from a job queue. If this is the first time, a processed index
	// will be initialized in the storage. If it fails to initialize, an error will be returned
	Start(defaultIndex uint64) error

	// Stop gracefully stops the consumer from reading new jobs from the job queue. It does not stop
	// the existing worker finishing their jobs
	// It blocks until the existing worker finish processing the job
	Stop()

	// LastProcessedIndex returns the last processed job index
	LastProcessedIndex() uint64

	// NotifyJobIsDone let the consumer know a job has been finished, so that consumer will take
	// the next job from the job queue if there are workers available. It returns the last processed job index.
	NotifyJobIsDone(JobID) uint64

	// Size returns the number of processing jobs in consumer.
	Size() uint
}

JobConsumer consumes jobs from a job queue, and it remembers which job it has processed, and is able to resume processing from the next.

type JobID added in v0.15.0 

type JobID string

JobID is a unique ID of the job.

type JobQueue added in v0.15.0 

type JobQueue interface {
	// Add a job to the job queue
	Add(job Job) error
}

type Jobs added in v0.15.0 

type Jobs interface {
	// AtIndex returns the job at the given index.
	// Error returns:
	//   * storage.ErrNotFound if a job at the provided index is not available
	AtIndex(index uint64) (Job, error)

	// Head returns the index of the last job
	Head() (uint64, error)
}

Jobs is the reader for an ordered job queue. Job can be fetched by the index, which start from 0

type LedgerMetrics 

type LedgerMetrics interface {
	// ForestApproxMemorySize records approximate memory usage of forest (all in-memory trees)
	ForestApproxMemorySize(bytes uint64)

	// ForestNumberOfTrees current number of trees in a forest (in memory)
	ForestNumberOfTrees(number uint64)

	// LatestTrieRegCount records the number of unique register allocated (the latest created trie)
	LatestTrieRegCount(number uint64)

	// LatestTrieRegCountDiff records the difference between the number of unique register allocated of the latest created trie and parent trie
	LatestTrieRegCountDiff(number int64)

	// LatestTrieRegSize records the size of unique register allocated (the latest created trie)
	LatestTrieRegSize(size uint64)

	// LatestTrieRegSizeDiff records the difference between the size of unique register allocated of the latest created trie and parent trie
	LatestTrieRegSizeDiff(size int64)

	// LatestTrieMaxDepthTouched records the maximum depth touched of the lastest created trie
	LatestTrieMaxDepthTouched(maxDepth uint16)

	// UpdateCount increase a counter of performed updates
	UpdateCount()

	// ProofSize records a proof size
	ProofSize(bytes uint32)

	// UpdateValuesNumber accumulates number of updated values
	UpdateValuesNumber(number uint64)

	// UpdateValuesSize total size (in bytes) of updates values
	UpdateValuesSize(byte uint64)

	// UpdateDuration records absolute time for the update of a trie
	UpdateDuration(duration time.Duration)

	// UpdateDurationPerItem records update time for single value (total duration / number of updated values)
	UpdateDurationPerItem(duration time.Duration)

	// ReadValuesNumber accumulates number of read values
	ReadValuesNumber(number uint64)

	// ReadValuesSize total size (in bytes) of read values
	ReadValuesSize(byte uint64)

	// ReadDuration records absolute time for the read from a trie
	ReadDuration(duration time.Duration)

	// ReadDurationPerItem records read time for single value (total duration / number of read values)
	ReadDurationPerItem(duration time.Duration)
}

LedgerMetrics provides an interface to record Ledger Storage metrics. Ledger storage is non-linear (fork-aware) so certain metrics are averaged and computed before emitting for better visibility

type LibP2PConnectionMetrics added in v0.29.1 

type LibP2PConnectionMetrics interface {
	// OutboundConnections updates the metric tracking the number of outbound connections of this node
	OutboundConnections(connectionCount uint)

	// InboundConnections updates the metric tracking the number of inbound connections of this node
	InboundConnections(connectionCount uint)
}

LibP2PConnectionMetrics encapsulates the metrics collectors for the connection manager of the libp2p node.

type LibP2PMetrics added in v0.29.0 

type LibP2PMetrics interface {
	GossipSubRouterMetrics
	ResolverMetrics
	DHTMetrics
	rcmgr.MetricsReporter
	LibP2PConnectionMetrics
}

type Local 

type Local interface {

	// NodeID returns the node ID of the local node.
	NodeID() flow.Identifier

	// Address returns the (listen) address of the local node.
	Address() string

	// Sign provides a signature oracle that given a message and hasher, it
	// generates and returns a signature over the message using the node's private key
	// as well as the input hasher
	Sign([]byte, hash.Hasher) (crypto.Signature, error)

	// NotMeFilter returns handy not-me filter for searching identity
	NotMeFilter() flow.IdentityFilter

	// SignFunc provides a signature oracle that given a message, a hasher, and a signing function, it
	// generates and returns a signature over the message using the node's private key
	// as well as the input hasher by invoking the given signing function. The overall idea of this function
	// is to not expose the private key to the caller.
	SignFunc([]byte, hash.Hasher, func(crypto.PrivateKey, []byte, hash.Hasher) (crypto.Signature,
		error)) (crypto.Signature, error)
}

Local encapsulates the stable local node information.

type MempoolMetrics 

type MempoolMetrics interface {
	MempoolEntries(resource string, entries uint)
	Register(resource string, entriesFunc EntriesFunc) error
}

type NetworkCoreMetrics added in v0.29.1 

type NetworkCoreMetrics interface {
	NetworkInboundQueueMetrics
	// OutboundMessageSent collects metrics related to a message sent by the node.
	OutboundMessageSent(sizeBytes int, topic string, protocol string, messageType string)
	// InboundMessageReceived collects metrics related to a message received by the node.
	InboundMessageReceived(sizeBytes int, topic string, protocol string, messageType string)
	// DuplicateInboundMessagesDropped increments the metric tracking the number of duplicate messages dropped by the node.
	DuplicateInboundMessagesDropped(topic string, protocol string, messageType string)
	// UnicastMessageSendingStarted increments the metric tracking the number of unicast messages sent by the node.
	UnicastMessageSendingStarted(topic string)
	// UnicastMessageSendingCompleted decrements the metric tracking the number of unicast messages sent by the node.
	UnicastMessageSendingCompleted(topic string)
	// MessageProcessingStarted increments the metric tracking the number of messages being processed by the node.
	MessageProcessingStarted(topic string)
	// MessageProcessingFinished tracks the time spent by the node to process a message and decrements the metric tracking
	// the number of messages being processed by the node.
	MessageProcessingFinished(topic string, duration time.Duration)
}

NetworkCoreMetrics encapsulates the metrics collectors for the core networking layer functionality.

type NetworkInboundQueueMetrics added in v0.29.1 

type NetworkInboundQueueMetrics interface {
	// MessageAdded increments the metric tracking the number of messages in the queue with the given priority
	MessageAdded(priority int)

	// MessageRemoved decrements the metric tracking the number of messages in the queue with the given priority
	MessageRemoved(priority int)

	// QueueDuration tracks the time spent by a message with the given priority in the queue
	QueueDuration(duration time.Duration, priority int)
}

NetworkInboundQueueMetrics encapsulates the metrics collectors for the inbound queue of the networking layer.

type NetworkMetrics 

type NetworkMetrics interface {
	LibP2PMetrics
	NetworkSecurityMetrics
	NetworkCoreMetrics
}

NetworkMetrics is the blanket abstraction that encapsulates the metrics collectors for the networking layer.

type NetworkSecurityMetrics added in v0.28.0 

type NetworkSecurityMetrics interface {
	// OnUnauthorizedMessage tracks the number of unauthorized messages seen on the network.
	OnUnauthorizedMessage(role, msgType, topic, offense string)

	// OnRateLimitedUnicastMessage tracks the number of rate limited messages seen on the network.
	OnRateLimitedUnicastMessage(role, msgType, topic, reason string)
}

NetworkSecurityMetrics metrics related to network protection.

type NewJobListener added in v0.15.0 

type NewJobListener interface {
	// Check let the producer notify the consumer that a new job has been added, so that the consumer
	// can check if there is worker available to process that job.
	Check()
}

type NoopReadyDoneAware added in v0.23.9 

type NoopReadyDoneAware struct{}

NoopReadyDoneAware is a ReadyDoneAware implementation whose ready/done channels close immediately

func (*NoopReadyDoneAware) Done added in v0.23.9 

func (n *NoopReadyDoneAware) Done() <-chan struct{}

func (*NoopReadyDoneAware) Ready added in v0.23.9 

func (n *NoopReadyDoneAware) Ready() <-chan struct{}

type PendingBlockBuffer 

type PendingBlockBuffer interface {
	Add(originID flow.Identifier, block *flow.Block) bool

	ByID(blockID flow.Identifier) (flow.Slashable[flow.Block], bool)

	ByParentID(parentID flow.Identifier) ([]flow.Slashable[flow.Block], bool)

	DropForParent(parentID flow.Identifier)

	// PruneByView prunes any pending blocks with views less or equal to the given view.
	PruneByView(view uint64)

	Size() uint
}

PendingBlockBuffer defines an interface for a cache of pending blocks that cannot yet be processed because they do not connect to the rest of the chain state. They are indexed by parent ID to enable processing all of a parent's children once the parent is received. Safe for concurrent use.

type PendingClusterBlockBuffer 

type PendingClusterBlockBuffer interface {
	Add(originID flow.Identifier, block *cluster.Block) bool

	ByID(blockID flow.Identifier) (flow.Slashable[cluster.Block], bool)

	ByParentID(parentID flow.Identifier) ([]flow.Slashable[cluster.Block], bool)

	DropForParent(parentID flow.Identifier)

	// PruneByView prunes any pending cluster blocks with views less or equal to the given view.
	PruneByView(view uint64)

	Size() uint
}

PendingClusterBlockBuffer is the same thing as PendingBlockBuffer, but for collection node cluster consensus. Safe for concurrent use.

type PingMetrics 

type PingMetrics interface {
	// NodeReachable tracks the round trip time in milliseconds taken to ping a node
	// The nodeInfo provides additional information about the node such as the name of the node operator
	NodeReachable(node *flow.Identity, nodeInfo string, rtt time.Duration)

	// NodeInfo tracks the software version, sealed height and hotstuff view of a node
	NodeInfo(node *flow.Identity, nodeInfo string, version string, sealedHeight uint64, hotstuffCurView uint64)
}

type ProcessingNotifier added in v0.15.0 

type ProcessingNotifier interface {
	Notify(entityID flow.Identifier)
}

ProcessingNotifier is for the worker's underneath engine to report an entity has been processed without knowing the job queue. It is a callback so that the worker can convert the entity id into a job id, and notify the consumer about a finished job.

At the current version, entities used in this interface are chunks and blocks ids.

type ProviderMetrics 

type ProviderMetrics interface {
	// ChunkDataPackRequestProcessed is executed every time a chunk data pack request is picked up for processing at execution node.
	// It increases the request processed counter by one.
	ChunkDataPackRequestProcessed()
}

type ProxiedReadyDoneAware added in v0.28.0 

type ProxiedReadyDoneAware struct {
	// contains filtered or unexported fields
}

ProxiedReadyDoneAware is a ReadyDoneAware implementation that proxies the ReadyDoneAware interface from another implementation. This allows for usecases where the Ready/Done methods are needed before the proxied object is initialized.

func NewProxiedReadyDoneAware added in v0.28.0 

func NewProxiedReadyDoneAware() *ProxiedReadyDoneAware

NewProxiedReadyDoneAware returns a new ProxiedReadyDoneAware instance

func (*ProxiedReadyDoneAware) Done added in v0.28.0 

func (n *ProxiedReadyDoneAware) Done() <-chan struct{}

func (*ProxiedReadyDoneAware) Init added in v0.28.0 

func (n *ProxiedReadyDoneAware) Init(rda ReadyDoneAware)

Init adds the proxied ReadyDoneAware implementation and sets up the ready/done channels to close when the respective channel on the proxied object closes. Init can only be called once.

IMPORTANT: the proxied ReadyDoneAware implementation must be idempotent since the Ready and Done methods will be called immediately when calling Init.

func (*ProxiedReadyDoneAware) Ready added in v0.28.0 

func (n *ProxiedReadyDoneAware) Ready() <-chan struct{}

type QCContractClient 

type QCContractClient interface {

	// SubmitVote submits the given vote to the cluster QC aggregator smart
	// contract. This function returns only once the transaction has been
	// processed by the network. An error is returned if the transaction has
	// failed and should be re-submitted.
	// Error returns:
	//   - network.TransientError for any errors from the underlying client, if the retry period has been exceeded
	//   - errTransactionExpired if the transaction has expired
	//   - errTransactionReverted if the transaction execution reverted
	//   - generic error in case of unexpected critical failure
	SubmitVote(ctx context.Context, vote *model.Vote) error

	// Voted returns true if we have successfully submitted a vote to the
	// cluster QC aggregator smart contract for the current epoch.
	// Error returns:
	//   - network.TransientError for any errors from the underlying Flow client
	//   - generic error in case of unexpected critical failures
	Voted(ctx context.Context) (bool, error)
}

QCContractClient enables interacting with the cluster QC aggregator smart contract. This contract is deployed to the service account as part of a collection of smart contracts that facilitate and manage epoch transitions.

type RandomBeaconKeyStore added in v0.23.9 

type RandomBeaconKeyStore interface {
	// ByView returns the consensus node's _private_ random beacon key share for
	// signing blocks at the given view. Possible returns:
	//  - (signer, nil) if the node has beacon keys in the epoch of the view
	//  - (nil, DKGFailError) if the node doesn't have beacon keys in the epoch of the view
	//  - (nil, error) if there is any exception
	ByView(view uint64) (crypto.PrivateKey, error)
}

RandomBeaconKeyStore returns the random beacon private key for the given view,

type RateLimitedBlockstoreMetrics added in v0.28.0 

type RateLimitedBlockstoreMetrics interface {
	BytesRead(int)
}

type ReadyDoneAware 

type ReadyDoneAware interface {
	// Ready commences startup of the module, and returns a ready channel that is closed once
	// startup has completed. Note that the ready channel may never close if errors are
	// encountered during startup.
	// If shutdown has already commenced before this method is called for the first time,
	// startup will not be performed and the returned channel will also never close.
	// This should be an idempotent method.
	Ready() <-chan struct{}

	// Done commences shutdown of the module, and returns a done channel that is closed once
	// shutdown has completed. Note that the done channel should be closed even if errors are
	// encountered during shutdown.
	// This should be an idempotent method.
	Done() <-chan struct{}
}

WARNING: The semantics of this interface will be changing in the near future, with startup / shutdown capabilities being delegated to the Startable interface instead. For more details, see https://github.com/onflow/flow-go/pull/1167

ReadyDoneAware provides an easy interface to wait for module startup and shutdown. Modules that implement this interface only support a single start-stop cycle, and will not restart if Ready() is called again after shutdown has already commenced.

type ReceiptValidator added in v0.14.0 

type ReceiptValidator interface {

	// Validate verifies that the ExecutionReceipt satisfies
	// the following conditions:
	// 	* is from Execution node with positive weight
	//	* has valid signature
	//	* chunks are in correct format
	// 	* execution result has a valid parent and satisfies the subgraph check
	// Returns nil if all checks passed successfully.
	// Expected errors during normal operations:
	// * engine.InvalidInputError
	//   if receipt violates protocol condition
	// * engine.UnverifiableInputError
	//   if receipt's parent result is unknown
	Validate(receipts *flow.ExecutionReceipt) error

	// ValidatePayload verifies the ExecutionReceipts and ExecutionResults
	// in the payload for compliance with the protocol:
	// Receipts:
	// 	* are from Execution node with positive weight
	//	* have valid signature
	//	* chunks are in correct format
	//  * no duplicates in fork
	// Results:
	// 	* have valid parents and satisfy the subgraph check
	//  * extend the execution tree, where the tree root is the latest
	//    finalized block and only results from this fork are included
	//  * no duplicates in fork
	// Expected errors during normal operations:
	// * engine.InvalidInputError
	//   if some receipts in the candidate block violate protocol condition
	// * engine.UnverifiableInputError
	//   if for some of the receipts, their respective parent result is unknown
	ValidatePayload(candidate *flow.Block) error
}

ReceiptValidator is an interface which is used for validating receipts with respect to current protocol state.

type Requester 

type Requester interface {
	// EntityByID will request an entity through the request engine backing
	// the interface. The additional selector will be applied to the subset
	// of valid providers for the entity and allows finer-grained control
	// over which providers to request a given entity from. Use `filter.Any`
	// if no additional restrictions are required. Data integrity of response
	// will be checked upon arrival. This function should be used for requesting
	// entites by their IDs.
	EntityByID(entityID flow.Identifier, selector flow.IdentityFilter)

	// Query will request data through the request engine backing the interface.
	// The additional selector will be applied to the subset
	// of valid providers for the data and allows finer-grained control
	// over which providers to request data from. Doesn't perform integrity check
	// can be used to get entities without knowing their ID.
	Query(key flow.Identifier, selector flow.IdentityFilter)

	// Force will force the dispatcher to send all possible batches immediately.
	// It can be used in cases where responsiveness is of utmost importance, at
	// the cost of additional network messages.
	Force()
}

type ResolverMetrics added in v0.21.0 

type ResolverMetrics interface {
	// DNSLookupDuration tracks the time spent to resolve a DNS address.
	DNSLookupDuration(duration time.Duration)

	// OnDNSCacheMiss tracks the total number of dns requests resolved through looking up the network.
	OnDNSCacheMiss()

	// OnDNSCacheHit tracks the total number of dns requests resolved through the cache without
	// looking up the network.
	OnDNSCacheHit()

	// OnDNSCacheInvalidated is called whenever dns cache is invalidated for an entry
	OnDNSCacheInvalidated()

	// OnDNSLookupRequestDropped tracks the number of dns lookup requests that are dropped due to a full queue
	OnDNSLookupRequestDropped()
}

ResolverMetrics encapsulates the metrics collectors for dns resolver module of the networking layer.

type RuntimeMetrics 

type RuntimeMetrics interface {
	// RuntimeTransactionParsed reports the time spent parsing a single transaction
	RuntimeTransactionParsed(dur time.Duration)

	// RuntimeTransactionChecked reports the time spent checking a single transaction
	RuntimeTransactionChecked(dur time.Duration)

	// RuntimeTransactionInterpreted reports the time spent interpreting a single transaction
	RuntimeTransactionInterpreted(dur time.Duration)

	// RuntimeSetNumberOfAccounts Sets the total number of accounts on the network
	RuntimeSetNumberOfAccounts(count uint64)

	// RuntimeTransactionProgramsCacheMiss reports a programs cache miss
	// during transaction execution
	RuntimeTransactionProgramsCacheMiss()

	// RuntimeTransactionProgramsCacheHit reports a programs cache hit
	// during transaction execution
	RuntimeTransactionProgramsCacheHit()
}

type SDKClientWrapper added in v0.20.0 

type SDKClientWrapper interface {
	GetAccount(context.Context, sdk.Address) (*sdk.Account, error)
	GetAccountAtLatestBlock(context.Context, sdk.Address) (*sdk.Account, error)
	SendTransaction(context.Context, sdk.Transaction) error
	GetLatestBlock(context.Context, bool) (*sdk.Block, error)
	GetTransactionResult(context.Context, sdk.Identifier) (*sdk.TransactionResult, error)
	ExecuteScriptAtLatestBlock(context.Context, []byte, []cadence.Value) (cadence.Value, error)
	ExecuteScriptAtBlockID(context.Context, sdk.Identifier, []byte, []cadence.Value) (cadence.Value, error)
}

SDKClientWrapper is a temporary solution to mocking the `sdk.Client` interface from `flow-go-sdk`

type SealValidator added in v0.14.0 

type SealValidator interface {
	Validate(candidate *flow.Block) (*flow.Seal, error)
}

SealValidator checks seals with respect to current protocol state. Accepts `candidate` block with seals that needs to be verified for protocol state validity. Returns the following values: * last seal in `candidate` block - in case of success * engine.InvalidInputError - in case if `candidate` block violates protocol state. * exception in case of any other error, usually this is not expected. PREREQUISITE: The SealValidator can only process blocks which are attached to the main chain (without any missing ancestors). This is the case because:

  • the Seal validator walks the chain backwards and requires the relevant ancestors to be known and validated
  • the storage.Seals only holds seals for block that are attached to the main chain.

type SealingConfigsGetter added in v0.26.13 

type SealingConfigsGetter interface {
	// updatable fields
	RequireApprovalsForSealConstructionDynamicValue() uint

	// not-updatable fields
	ChunkAlphaConst() uint
	RequireApprovalsForSealVerificationConst() uint
	EmergencySealingActiveConst() bool
	ApprovalRequestsThresholdConst() uint64
}

SealingConfigsGetter is an interface for the actual updatable configs module. but only exposes its getter methods to return the config values without exposing its setter methods. SealingConfigs contains three configs: - RequireApprovalsForSealingConstruction (updatable) - RequireApprovalsForSealingVerification (not-updatable) - ChunkAlpha (not-updatable) - EmergencySealingActive (not-updatable) - ApprovalRequestsThreshold (not-updatable)

type SealingConfigsSetter added in v0.26.13 

type SealingConfigsSetter interface {
	SealingConfigsGetter
	// SetRequiredApprovalsForSealingConstruction takes a new config value and updates the config
	// if the new value is valid.
	// Returns ValidationError if the new value results in an invalid sealing config.
	SetRequiredApprovalsForSealingConstruction(newVal uint) error
}

SealingConfigsSetter is an interface that allows the caller to update updatable configs

type Startable added in v0.22.4 

type Startable interface {
	// Start starts the component. Any irrecoverable errors encountered while the component is running
	// should be thrown with the given SignalerContext.
	// This method should only be called once, and subsequent calls should panic with ErrMultipleStartup.
	Start(irrecoverable.SignalerContext)
}

Startable provides an interface to start a component. Once started, the component can be stopped by cancelling the given context.

type SyncCore 

type SyncCore interface {

	// HandleBlock handles receiving a new block. It returns true if the block
	// should be passed along to the rest of the system for processing, or false
	// if it should be discarded.
	HandleBlock(header *flow.Header) bool

	// HandleHeight handles receiving a new highest finalized height from another node.
	HandleHeight(final *flow.Header, height uint64)

	// ScanPending scans all pending block statuses for blocks that should be
	// requested. It apportions requestable items into range and batch requests
	// according to configured maximums, giving precedence to range requests.
	ScanPending(final *flow.Header) ([]chainsync.Range, []chainsync.Batch)

	// WithinTolerance returns whether or not the given height is within configured
	// height tolerance, wrt the given local finalized header.
	WithinTolerance(final *flow.Header, height uint64) bool

	// RangeRequested updates sync state after a range is requested.
	RangeRequested(ran chainsync.Range)

	// BatchRequested updates sync state after a batch is requested.
	BatchRequested(batch chainsync.Batch)
}

SyncCore represents state management for chain state synchronization.

type Tracer 

type Tracer interface {
	ReadyDoneAware

	// StartBlockSpan starts an span for a block, built as a child of rootSpan
	// it also returns the context including this span which can be used for nested calls.
	// and also a boolean reporting if this span is sampled (is used for avoiding unncessary computation for tags)
	StartBlockSpan(
		ctx context.Context,
		blockID flow.Identifier,
		spanName trace.SpanName,
		opts ...otelTrace.SpanStartOption,
	) (otelTrace.Span, context.Context, bool)

	// StartCollectionSpan starts an span for a collection, built as a child of rootSpan
	// it also returns the context including this span which can be used for nested calls.
	// and also a boolean reporting if this span is sampled (is used for avoiding unncessary computation for tags)
	StartCollectionSpan(
		ctx context.Context,
		collectionID flow.Identifier,
		spanName trace.SpanName,
		opts ...otelTrace.SpanStartOption,
	) (otelTrace.Span, context.Context, bool)

	// StartTransactionSpan starts an span for a transaction, built as a child of rootSpan
	// it also returns the context including this span which can be used for nested calls.
	// and also a boolean reporting if this span is sampled (is used for avoiding unncessary computation for tags)
	StartTransactionSpan(
		ctx context.Context,
		transactionID flow.Identifier,
		spanName trace.SpanName,
		opts ...otelTrace.SpanStartOption,
	) (otelTrace.Span, context.Context, bool)

	StartSpanFromContext(
		ctx context.Context,
		operationName trace.SpanName,
		opts ...otelTrace.SpanStartOption,
	) (otelTrace.Span, context.Context)

	StartSpanFromParent(
		parentSpan otelTrace.Span,
		operationName trace.SpanName,
		opts ...otelTrace.SpanStartOption,
	) otelTrace.Span

	// RecordSpanFromParent records an span at finish time
	// start time will be computed by reducing time.Now() - duration
	RecordSpanFromParent(
		parentSpan otelTrace.Span,
		operationName trace.SpanName,
		duration time.Duration,
		attrs []attribute.KeyValue,
		opts ...otelTrace.SpanStartOption,
	)

	// WithSpanFromContext encapsulates executing a function within an span, i.e., it starts a span with the specified SpanName from the context,
	// executes the function f, and finishes the span once the function returns.
	WithSpanFromContext(
		ctx context.Context,
		operationName trace.SpanName,
		f func(),
		opts ...otelTrace.SpanStartOption,
	)
}

Tracer interface for tracers in flow. Uses open tracing span definitions

type TransactionMetrics 

type TransactionMetrics interface {
	BackendScriptsMetrics

	// Record the round trip time while getting a transaction result
	TransactionResultFetched(dur time.Duration, size int)

	// TransactionReceived starts tracking of transaction execution/finalization/sealing
	TransactionReceived(txID flow.Identifier, when time.Time)

	// TransactionFinalized reports the time spent between the transaction being received and finalized. Reporting only
	// works if the transaction was earlier added as received.
	TransactionFinalized(txID flow.Identifier, when time.Time)

	// TransactionExecuted reports the time spent between the transaction being received and executed. Reporting only
	// works if the transaction was earlier added as received.
	TransactionExecuted(txID flow.Identifier, when time.Time)

	// TransactionExpired tracks number of expired transactions
	TransactionExpired(txID flow.Identifier)

	// TransactionSubmissionFailed should be called whenever we try to submit a transaction and it fails
	TransactionSubmissionFailed()

	// UpdateExecutionReceiptMaxHeight is called whenever we store an execution receipt from a block from a newer height
	UpdateExecutionReceiptMaxHeight(height uint64)
}

type VerificationMetrics 

type VerificationMetrics interface {
	// OnBlockConsumerJobDone is invoked by block consumer whenever it is notified a job is done by a worker. It
	// sets the last processed block job index.
	OnBlockConsumerJobDone(uint64)
	// OnChunkConsumerJobDone is invoked by chunk consumer whenever it is notified a job is done by a worker. It
	// sets the last processed chunk job index.
	OnChunkConsumerJobDone(uint64)
	// OnExecutionResultReceivedAtAssignerEngine is called whenever a new execution result arrives
	// at Assigner engine. It increments total number of received execution results.
	OnExecutionResultReceivedAtAssignerEngine()

	// OnVerifiableChunkReceivedAtVerifierEngine increments a counter that keeps track of number of verifiable chunks received at
	// verifier engine from fetcher engine.
	OnVerifiableChunkReceivedAtVerifierEngine()

	// OnFinalizedBlockArrivedAtAssigner sets a gauge that keeps track of number of the latest block height arrives
	// at assigner engine. Note that it assumes blocks are coming to assigner engine in strictly increasing order of their height.
	OnFinalizedBlockArrivedAtAssigner(height uint64)

	// OnChunksAssignmentDoneAtAssigner increments a counter that keeps track of the total number of assigned chunks to
	// the verification node.
	OnChunksAssignmentDoneAtAssigner(chunks int)

	// OnAssignedChunkProcessedAtAssigner increments a counter that keeps track of the total number of assigned chunks pushed by
	// assigner engine to the fetcher engine.
	OnAssignedChunkProcessedAtAssigner()

	// OnAssignedChunkReceivedAtFetcher increments a counter that keeps track of number of assigned chunks arrive at fetcher engine.
	OnAssignedChunkReceivedAtFetcher()

	// OnChunkDataPackRequestSentByFetcher increments a counter that keeps track of number of chunk data pack requests that fetcher engine
	// sends to requester engine.
	OnChunkDataPackRequestSentByFetcher()

	// OnChunkDataPackRequestReceivedByRequester increments a counter that keeps track of number of chunk data pack requests
	// arrive at the requester engine from the fetcher engine.
	OnChunkDataPackRequestReceivedByRequester()

	// OnChunkDataPackRequestDispatchedInNetwork increments a counter that keeps track of number of chunk data pack requests that the
	// requester engine dispatches in the network (to the execution nodes).
	OnChunkDataPackRequestDispatchedInNetworkByRequester()

	// OnChunkDataPackResponseReceivedFromNetwork increments a counter that keeps track of number of chunk data pack responses that the
	// requester engine receives from execution nodes (through network).
	OnChunkDataPackResponseReceivedFromNetworkByRequester()

	// SetMaxChunkDataPackAttemptsForNextUnsealedHeightAtRequester is invoked when a cycle of requesting chunk data packs is done by requester engine.
	// It updates the maximum number of attempts made by requester engine for requesting the chunk data packs of the next unsealed height.
	// The maximum is taken over the history of all chunk data packs requested during that cycle that belong to the next unsealed height.
	SetMaxChunkDataPackAttemptsForNextUnsealedHeightAtRequester(attempts uint64)

	// OnChunkDataPackSentToFetcher increments a counter that keeps track of number of chunk data packs sent to the fetcher engine from
	// requester engine.
	OnChunkDataPackSentToFetcher()

	// OnChunkDataPackArrivedAtFetcher increments a counter that keeps track of number of chunk data packs arrived at fetcher engine from
	// requester engine.
	OnChunkDataPackArrivedAtFetcher()

	// OnVerifiableChunkSentToVerifier increments a counter that keeps track of number of verifiable chunks fetcher engine sent to verifier engine.
	OnVerifiableChunkSentToVerifier()

	// OnResultApprovalDispatchedInNetwork increments a counter that keeps track of number of result approvals dispatched in the network
	// by verifier engine.
	OnResultApprovalDispatchedInNetworkByVerifier()
}

type WALMetrics added in v0.15.4 

type WALMetrics interface {
}

Source Files

View all Source files

Directories

Path Synopsis
builder
collection
consensus
mock
Package dkg implements a controller that manages the lifecycle of a Joint Feldman DKG node, as well as a broker that enables the controller to communicate with other nodes
 Package dkg implements a controller that manages the lifecycle of a Joint Feldman DKG node, as well as a broker that enables the controller to communicate with other nodes
executiondatasync
execution_data
execution_data/mock
provider
pruner
tracker
tracker/mock
finalizer
collection
consensus
mock
(c) 2019 Dapper Labs - ALL RIGHTS RESERVED
 (c) 2019 Dapper Labs - ALL RIGHTS RESERVED
consensus
consensus/mock
entity
epochs
herocache
herocache/backdata
herocache/backdata/heropool
mock
model
queue
queue/internal
stdmap
(c) 2019 Dapper Labs - ALL RIGHTS RESERVED
 (c) 2019 Dapper Labs - ALL RIGHTS RESERVED
stdmap/backdata
example
example/collection
example/consensus
example/execution
example/verification
hotstuff
unstaked
Package mocks is a generated GoMock package.
 Package mocks is a generated GoMock package.
mock
requester
requester/jobs
requester/unittest
validation

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