etcdraft

package
v0.0.0-...-e295948 Latest Latest
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 Go to latest Published: Oct 26, 2020 License: Apache-2.0 Imports: 41 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	BYTE = 1 << (10 * iota)
	KILOBYTE
	MEGABYTE
	GIGABYTE
	TERABYTE
)
View Source 
const (
	// DefaultSnapshotCatchUpEntries is the default number of entries
	// to preserve in memory when a snapshot is taken. This is for
	// slow followers to catch up.
	DefaultSnapshotCatchUpEntries = uint64(4)

	// DefaultSnapshotIntervalSize is the default snapshot interval. It is
	// used if SnapshotIntervalSize is not provided in channel config options.
	// It is needed to enforce snapshot being set.
	DefaultSnapshotIntervalSize = 16 * MEGABYTE

	// DefaultEvictionSuspicion is the threshold that a node will start
	// suspecting its own eviction if it has been leaderless for this
	// period of time.
	DefaultEvictionSuspicion = time.Minute * 10

	// DefaultLeaderlessCheckInterval is the interval that a chain checks
	// its own leadership status.
	DefaultLeaderlessCheckInterval = time.Second * 10
)

Variables

View Source 
var (
	ActiveNodesOpts = metrics.GaugeOpts{
		Namespace:    "consensus",
		Subsystem:    "etcdraft",
		Name:         "active_nodes",
		Help:         "Number of active nodes in this channel.",
		LabelNames:   []string{"channel"},
		StatsdFormat: "%{#fqname}.%{channel}",
	}
)
View Source 
var MaxSnapshotFiles = 4

MaxSnapshotFiles defines max number of etcd/raft snapshot files to retain on filesystem. Snapshot files are read from newest to oldest, until first intact file is found. The more snapshot files we keep around, the more we mitigate the impact of a corrupted snapshots. This is exported for testing purpose. This MUST be greater equal than 1.

Functions

func CheckConfigMetadata 

func CheckConfigMetadata(metadata *etcdraft.ConfigMetadata) error

CheckConfigMetadata validates Raft config metadata

func ConfChange 

func ConfChange(blockMetadata *etcdraft.BlockMetadata, confState *raftpb.ConfState) *raftpb.ConfChange

ConfChange computes Raft configuration changes based on current Raft configuration state and consenters IDs stored in RaftMetadata.

func ConfigChannelHeader 

func ConfigChannelHeader(block *common.Block) (hdr *common.ChannelHeader, err error)

ConfigChannelHeader expects a config block and returns the header type of the config envelope wrapped in it, e.g. HeaderType_ORDERER_TRANSACTION

func ConfigEnvelopeFromBlock 

func ConfigEnvelopeFromBlock(block *common.Block) (*common.Envelope, error)

ConfigEnvelopeFromBlock extracts configuration envelope from the block based on the config type, i.e. HeaderType_ORDERER_TRANSACTION or HeaderType_CONFIG

func ConsensusMetadataFromConfigBlock 

func ConsensusMetadataFromConfigBlock(block *common.Block) (*etcdraft.ConfigMetadata, error)

ConsensusMetadataFromConfigBlock reads consensus metadata updates from the configuration block

func ConsentersToMap 

func ConsentersToMap(consenters []*etcdraft.Consenter) map[string]struct{}

ConsentersToMap maps consenters into set where key is client TLS certificate

func CreateConsentersMap 

func CreateConsentersMap(blockMetadata *etcdraft.BlockMetadata, configMetadata *etcdraft.ConfigMetadata) map[uint64]*etcdraft.Consenter

CreateConsentersMap creates a map of Raft Node IDs to Consenter given the block metadata and the config metadata.

func EndpointconfigFromSupport 

func EndpointconfigFromSupport(support consensus.ConsenterSupport, bccsp bccsp.BCCSP) ([]cluster.EndpointCriteria, error)

EndpointconfigFromSupport extracts TLS CA certificates and endpoints from the ConsenterSupport

func ListSnapshots 

func ListSnapshots(logger *flogging.FabricLogger, snapDir string) []uint64

ListSnapshots returns a list of RaftIndex of snapshots stored on disk. If a file is corrupted, rename the file.

func MembershipByCert 

func MembershipByCert(consenters map[uint64]*etcdraft.Consenter) map[string]uint64

MembershipByCert convert consenters map into set encapsulated by map where key is client TLS certificate

func MetadataFromConfigUpdate 

func MetadataFromConfigUpdate(update *common.ConfigUpdate) (*etcdraft.ConfigMetadata, error)

MetadataFromConfigUpdate extracts consensus metadata from config update

func MetadataFromConfigValue 

func MetadataFromConfigValue(configValue *common.ConfigValue) (*etcdraft.ConfigMetadata, error)

MetadataFromConfigValue reads and translates configuration updates from config value into raft metadata

func MetadataHasDuplication 

func MetadataHasDuplication(md *etcdraft.ConfigMetadata) error

MetadataHasDuplication returns an error if the metadata has duplication of consenters. A duplication is defined by having a server or a client TLS certificate that is found in two different consenters, regardless of the type of certificate (client/server).

func NodeExists 

func NodeExists(id uint64, nodes []uint64) bool

NodeExists returns trues if node id exists in the slice and false otherwise

func RaftPeers 

func RaftPeers(consenterIDs []uint64) []raft.Peer

RaftPeers maps consenters to slice of raft.Peer

func ReadBlockMetadata 

func ReadBlockMetadata(blockMetadata *common.Metadata, configMetadata *etcdraft.ConfigMetadata) (*etcdraft.BlockMetadata, error)

ReadBlockMetadata attempts to read raft metadata from block metadata, if available. otherwise, it reads raft metadata from config metadata supplied.

Types

type BlockPuller 

type BlockPuller interface {
	PullBlock(seq uint64) *common.Block
	HeightsByEndpoints() (map[string]uint64, error)
	Close()
}

BlockPuller is used to pull blocks from other OSN

func NewBlockPuller 

func NewBlockPuller(support consensus.ConsenterSupport,
	baseDialer *cluster.PredicateDialer,
	clusterConfig localconfig.Cluster,
	bccsp bccsp.BCCSP,
) (BlockPuller, error)

NewBlockPuller creates a new block puller

type Chain 

type Chain struct {
	ActiveNodes atomic.Value

	// this is exported so that test can use `Node.Status()` to get raft node status.
	Node *node

	Metrics *Metrics

	// BCCSP instane
	CryptoProvider bccsp.BCCSP
	// contains filtered or unexported fields
}

Chain implements consensus.Chain interface.

func NewChain 

func NewChain(
	support consensus.ConsenterSupport,
	opts Options,
	conf Configurator,
	rpc RPC,
	cryptoProvider bccsp.BCCSP,
	f CreateBlockPuller,
	haltCallback func(),
	observeC chan<- raft.SoftState,
) (*Chain, error)

NewChain constructs a chain object.

func (*Chain) Configure 

func (c *Chain) Configure(env *common.Envelope, configSeq uint64) error

Configure submits config type transactions for ordering.

func (*Chain) Consensus 

func (c *Chain) Consensus(req *orderer.ConsensusRequest, sender uint64) error

Consensus passes the given ConsensusRequest message to the raft.Node instance

func (*Chain) Errored 

func (c *Chain) Errored() <-chan struct{}

Errored returns a channel that closes when the chain stops.

func (*Chain) Halt 

func (c *Chain) Halt()

Halt stops the chain.

func (*Chain) Order 

func (c *Chain) Order(env *common.Envelope, configSeq uint64) error

Order submits normal type transactions for ordering.

func (*Chain) Start 

func (c *Chain) Start()

Start instructs the orderer to begin serving the chain and keep it current.

func (*Chain) Submit 

func (c *Chain) Submit(req *orderer.SubmitRequest, sender uint64) error

Submit forwards the incoming request to: - the local run goroutine if this is leader - the actual leader via the transport mechanism The call fails if there's no leader elected yet.

func (*Chain) ValidateConsensusMetadata 

func (c *Chain) ValidateConsensusMetadata(oldMetadataBytes, newMetadataBytes []byte, newChannel bool) error

ValidateConsensusMetadata determines the validity of a ConsensusMetadata update during config updates on the channel.

func (*Chain) WaitReady 

func (c *Chain) WaitReady() error

WaitReady blocks when the chain: - is catching up with other nodes using snapshot

In any other case, it returns right away.

type ChainGetter 

type ChainGetter interface {
	// GetChain obtains the ChainSupport for the given channel.
	// Returns nil, false when the ChainSupport for the given channel
	// isn't found.
	GetChain(chainID string) *multichannel.ChainSupport
}

ChainGetter obtains instances of ChainSupport for the given channel

type Config 

type Config struct {
	WALDir            string // WAL data of <my-channel> is stored in WALDir/<my-channel>
	SnapDir           string // Snapshots of <my-channel> are stored in SnapDir/<my-channel>
	EvictionSuspicion string // Duration threshold that the node samples in order to suspect its eviction from the channel.
}

Config contains etcdraft configurations

type Configurator 

type Configurator interface {
	Configure(channel string, newNodes []cluster.RemoteNode)
}

Configurator is used to configure the communication layer when the chain starts.

type Consenter 

type Consenter struct {
	CreateChain           func(chainName string)
	InactiveChainRegistry InactiveChainRegistry
	Dialer                *cluster.PredicateDialer
	Communication         cluster.Communicator
	*Dispatcher
	Chains         ChainGetter
	Logger         *flogging.FabricLogger
	EtcdRaftConfig Config
	OrdererConfig  localconfig.TopLevel
	Cert           []byte
	Metrics        *Metrics
	BCCSP          bccsp.BCCSP
}

Consenter implements etcdraft consenter

func New 

func New(
	clusterDialer *cluster.PredicateDialer,
	conf *localconfig.TopLevel,
	srvConf comm.ServerConfig,
	srv *comm.GRPCServer,
	r *multichannel.Registrar,
	icr InactiveChainRegistry,
	metricsProvider metrics.Provider,
	bccsp bccsp.BCCSP,
) *Consenter

New creates a etcdraft Consenter

func (*Consenter) HandleChain 

func (c *Consenter) HandleChain(support consensus.ConsenterSupport, metadata *common.Metadata) (consensus.Chain, error)

HandleChain returns a new Chain instance or an error upon failure

func (*Consenter) ReceiverByChain 

func (c *Consenter) ReceiverByChain(channelID string) MessageReceiver

ReceiverByChain returns the MessageReceiver for the given channelID or nil if not found.

func (*Consenter) TargetChannel 

func (c *Consenter) TargetChannel(message proto.Message) string

TargetChannel extracts the channel from the given proto.Message. Returns an empty string on failure.

type ConsenterCertificate 

type ConsenterCertificate struct {
	ConsenterCertificate []byte
	CryptoProvider       bccsp.BCCSP
}

ConsenterCertificate denotes a TLS certificate of a consenter

func (ConsenterCertificate) IsConsenterOfChannel 

func (conCert ConsenterCertificate) IsConsenterOfChannel(configBlock *common.Block) error

IsConsenterOfChannel returns whether the caller is a consenter of a channel by inspecting the given configuration block. It returns nil if true, else returns an error.

type CreateBlockPuller 

type CreateBlockPuller func() (BlockPuller, error)

CreateBlockPuller is a function to create BlockPuller on demand. It is passed into chain initializer so that tests could mock this.

type Dispatcher 

type Dispatcher struct {
	Logger        *flogging.FabricLogger
	ChainSelector ReceiverGetter
}

Dispatcher dispatches Submit and Step requests to the designated per chain instances

func (*Dispatcher) OnConsensus 

func (d *Dispatcher) OnConsensus(channel string, sender uint64, request *orderer.ConsensusRequest) error

OnConsensus notifies the Dispatcher for a reception of a StepRequest from a given sender on a given channel

func (*Dispatcher) OnSubmit 

func (d *Dispatcher) OnSubmit(channel string, sender uint64, request *orderer.SubmitRequest) error

OnSubmit notifies the Dispatcher for a reception of a SubmitRequest from a given sender on a given channel

type Disseminator 

type Disseminator struct {
	RPC
	// contains filtered or unexported fields
}

Disseminator piggybacks cluster metadata, if any, to egress messages.

func (*Disseminator) SendConsensus 

func (d *Disseminator) SendConsensus(dest uint64, msg *orderer.ConsensusRequest) error

func (*Disseminator) UpdateMetadata 

func (d *Disseminator) UpdateMetadata(m []byte)

type InactiveChainRegistry 

type InactiveChainRegistry interface {
	// TrackChain tracks a chain with the given name, and calls the given callback
	// when this chain should be created.
	TrackChain(chainName string, genesisBlock *common.Block, createChain func())
}

InactiveChainRegistry registers chains that are inactive

type LedgerBlockPuller 

type LedgerBlockPuller struct {
	BlockPuller
	BlockRetriever cluster.BlockRetriever
	Height         func() uint64
}

LedgerBlockPuller pulls blocks upon demand, or fetches them from the ledger

func (*LedgerBlockPuller) PullBlock 

func (lp *LedgerBlockPuller) PullBlock(seq uint64) *common.Block

type MembershipChanges 

type MembershipChanges struct {
	NewBlockMetadata *etcdraft.BlockMetadata
	NewConsenters    map[uint64]*etcdraft.Consenter
	AddedNodes       []*etcdraft.Consenter
	RemovedNodes     []*etcdraft.Consenter
	ConfChange       *raftpb.ConfChange
	RotatedNode      uint64
}

MembershipChanges keeps information about membership changes introduced during configuration update

func ComputeMembershipChanges 

func ComputeMembershipChanges(oldMetadata *etcdraft.BlockMetadata, oldConsenters map[uint64]*etcdraft.Consenter, newConsenters []*etcdraft.Consenter, ordererConfig channelconfig.Orderer) (mc *MembershipChanges, err error)

ComputeMembershipChanges computes membership update based on information about new consenters, returns two slices: a slice of added consenters and a slice of consenters to be removed

func (*MembershipChanges) Changed 

func (mc *MembershipChanges) Changed() bool

Changed indicates whether these changes actually do anything

func (*MembershipChanges) Rotated 

func (mc *MembershipChanges) Rotated() bool

Rotated indicates whether the change was a rotation

func (*MembershipChanges) String 

func (mc *MembershipChanges) String() string

Stringer implements fmt.Stringer interface

func (*MembershipChanges) UnacceptableQuorumLoss 

func (mc *MembershipChanges) UnacceptableQuorumLoss(active []uint64) bool

UnacceptableQuorumLoss returns true if membership change will result in avoidable quorum loss, given current number of active nodes in cluster. Avoidable means that more nodes can be started to prevent quorum loss. Sometimes, quorum loss is inevitable, for example expanding 1-node cluster.

type MemoryStorage 

type MemoryStorage interface {
	raft.Storage
	Append(entries []raftpb.Entry) error
	SetHardState(st raftpb.HardState) error
	CreateSnapshot(i uint64, cs *raftpb.ConfState, data []byte) (raftpb.Snapshot, error)
	Compact(compactIndex uint64) error
	ApplySnapshot(snap raftpb.Snapshot) error
}

MemoryStorage is currently backed by etcd/raft.MemoryStorage. This interface is defined to expose dependencies of fsm so that it may be swapped in the future. TODO(jay) Add other necessary methods to this interface once we need them in implementation, e.g. ApplySnapshot.

type MessageReceiver 

type MessageReceiver interface {
	// Consensus passes the given ConsensusRequest message to the MessageReceiver
	Consensus(req *orderer.ConsensusRequest, sender uint64) error

	// Submit passes the given SubmitRequest message to the MessageReceiver
	Submit(req *orderer.SubmitRequest, sender uint64) error
}

MessageReceiver receives messages

type Metrics 

type Metrics struct {
	ClusterSize             metrics.Gauge
	IsLeader                metrics.Gauge
	ActiveNodes             metrics.Gauge
	CommittedBlockNumber    metrics.Gauge
	SnapshotBlockNumber     metrics.Gauge
	LeaderChanges           metrics.Counter
	ProposalFailures        metrics.Counter
	DataPersistDuration     metrics.Histogram
	NormalProposalsReceived metrics.Counter
	ConfigProposalsReceived metrics.Counter
}

func NewMetrics 

func NewMetrics(p metrics.Provider) *Metrics

type Options 

type Options struct {
	RaftID uint64

	Clock clock.Clock

	WALDir               string
	SnapDir              string
	SnapshotIntervalSize uint32

	// This is configurable mainly for testing purpose. Users are not
	// expected to alter this. Instead, DefaultSnapshotCatchUpEntries is used.
	SnapshotCatchUpEntries uint64

	MemoryStorage MemoryStorage
	Logger        *flogging.FabricLogger

	TickInterval      time.Duration
	ElectionTick      int
	HeartbeatTick     int
	MaxSizePerMsg     uint64
	MaxInflightBlocks int

	// BlockMetdata and Consenters should only be modified while under lock
	// of raftMetadataLock
	BlockMetadata *etcdraft.BlockMetadata
	Consenters    map[uint64]*etcdraft.Consenter

	// MigrationInit is set when the node starts right after consensus-type migration
	MigrationInit bool

	Metrics *Metrics
	Cert    []byte

	EvictionSuspicion   time.Duration
	LeaderCheckInterval time.Duration
}

Options contains all the configurations relevant to the chain.

type PeriodicCheck 

type PeriodicCheck struct {
	Logger        *flogging.FabricLogger
	CheckInterval time.Duration
	Condition     func() bool
	Report        func(cumulativePeriod time.Duration)
	// contains filtered or unexported fields
}

PeriodicCheck checks periodically a condition, and reports the cumulative consecutive period the condition was fulfilled.

func (*PeriodicCheck) Run 

func (pc *PeriodicCheck) Run()

Run runs the PeriodicCheck

func (*PeriodicCheck) Stop 

func (pc *PeriodicCheck) Stop()

Stop stops the periodic checks

type RPC 

type RPC interface {
	SendConsensus(dest uint64, msg *orderer.ConsensusRequest) error
	SendSubmit(dest uint64, request *orderer.SubmitRequest) error
}

RPC is used to mock the transport layer in tests.

type RaftStorage 

type RaftStorage struct {
	SnapshotCatchUpEntries uint64
	// contains filtered or unexported fields
}

RaftStorage encapsulates storages needed for etcd/raft data, i.e. memory, wal

func CreateStorage 

func CreateStorage(
	lg *flogging.FabricLogger,
	walDir string,
	snapDir string,
	ram MemoryStorage,
) (*RaftStorage, error)

CreateStorage attempts to create a storage to persist etcd/raft data. If data presents in specified disk, they are loaded to reconstruct storage state.

func (*RaftStorage) ApplySnapshot 

func (rs *RaftStorage) ApplySnapshot(snap raftpb.Snapshot)

ApplySnapshot applies snapshot to local memory storage

func (*RaftStorage) Close 

func (rs *RaftStorage) Close() error

Close closes storage

func (*RaftStorage) Snapshot 

func (rs *RaftStorage) Snapshot() raftpb.Snapshot

Snapshot returns the latest snapshot stored in memory

func (*RaftStorage) Store 

func (rs *RaftStorage) Store(entries []raftpb.Entry, hardstate raftpb.HardState, snapshot raftpb.Snapshot) error

Store persists etcd/raft data

func (*RaftStorage) TakeSnapshot 

func (rs *RaftStorage) TakeSnapshot(i uint64, cs raftpb.ConfState, data []byte) error

TakeSnapshot takes a snapshot at index i from MemoryStorage, and persists it to wal and disk.

type ReceiverGetter 

type ReceiverGetter interface {
	// ReceiverByChain returns the MessageReceiver if it exists, or nil if it doesn't
	ReceiverByChain(channelID string) MessageReceiver
}

ReceiverGetter obtains instances of MessageReceiver given a channel ID

type Tracker 

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

Tracker periodically poll Raft Status, and update disseminator so that status is populated to followers.

func (*Tracker) Check 

func (t *Tracker) Check(status *raft.Status)

Source Files

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Directories

Path Synopsis
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