sharding

package
v1.0.126 Latest Latest
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 Go to latest Published: Jun 5, 2020 License: GPL-3.0 Imports: 22 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

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var ErrCouldNotParseAddress = errors.New("could not parse node's address")

ErrCouldNotParseAddress signals that a given address could not be parsed

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var ErrCouldNotParsePubKey = errors.New("could not parse node's public key")

ErrCouldNotParsePubKey signals that a given public key could not be parsed

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var ErrEpochNodesConfigDoesNotExist = errors.New("epoch nodes configuration does not exist")

ErrEpochNodesConfigDoesNotExist signals that the epoch nodes configuration is missing

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var ErrInvalidConsensusGroupSize = errors.New("invalid consensus group size")

ErrInvalidConsensusGroupSize signals that the consensus size is invalid (e.g. value is negative)

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var ErrInvalidNumberOfShards = errors.New("the number of shards must be greater than zero")

ErrInvalidNumberOfShards signals that an invalid number of shards was passed to the sharding registry

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var ErrInvalidNumberPubKeys = errors.New("invalid number of public keys")

ErrInvalidNumberPubKeys signals that an invalid number of public keys was used

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var ErrInvalidSampleSize = errors.New("invalid sample size")

ErrInvalidSampleSize signals that an invalid sample size was provided

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var ErrInvalidShardId = errors.New("shard id must be smaller than the total number of shards")

ErrInvalidShardId signals that an invalid shard is was passed

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var ErrInvalidWeight = errors.New("invalid weight")

ErrInvalidWeight signals an invalid weight was provided

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var ErrMapSizeZero = errors.New("map size zero")

ErrMapSizeZero signals that there are no elements in the map

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var ErrMinNodesPerShardSmallerThanConsensusSize = errors.New("minimum nodes per shard is smaller than consensus group size")

ErrMinNodesPerShardSmallerThanConsensusSize signals that an invalid min nodes per shard has been provided

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var ErrNegativeOrZeroConsensusGroupSize = errors.New("negative or zero consensus group size")

ErrNegativeOrZeroConsensusGroupSize signals that an invalid consensus group size has been provided

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var ErrNilBlockBody = errors.New("nil block body")

ErrNilBlockBody signals that block body is nil

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var ErrNilBootStorer = errors.New("nil boot storer provided")

ErrNilBootStorer signals that a nil boot storer was provided

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var ErrNilCacher = errors.New("nil cacher")

ErrNilCacher signals that a nil cacher has been provided

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var ErrNilChanceComputer = errors.New("nil chance computer")

ErrNilChanceComputer signals that a nil chance computer was provided

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var ErrNilEndOfProcessingHandler = errors.New("nil end of processing handler")

ErrNilEndOfProcessingHandler signals that a nil end of processing handler has been provided

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var ErrNilHasher = errors.New("nil hasher")

ErrNilHasher signals that a nil hasher has been provided

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var ErrNilInputNodesMap = errors.New("nil input nodes map")

ErrNilInputNodesMap signals that a nil nodes map was provided

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var ErrNilMarshalizer = errors.New("nil marshalizer")

ErrNilMarshalizer signals that the marshalizer is nil

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var ErrNilNodesCoordinator = errors.New("nil nodesCoordinator")

ErrNilNodesCoordinator signals that the nodesCoordinator is nil

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var ErrNilOrEmptyDestinationForDistribute = errors.New("nil or empty destination list for distributeNodes")

ErrNilOrEmptyDestinationForDistribute signals that a nil or empty value was provided for destination of distributedNodes

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var ErrNilOwnPublicKey = errors.New("nil own public key")

ErrNilOwnPublicKey signals that a nil own public key has been provided

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var ErrNilPubKey = errors.New("nil public key")

ErrNilPubKey signals that the public key is nil

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var ErrNilPubkeyConverter = errors.New("trying to set nil pubkey converter")

ErrNilPubkeyConverter signals that a nil public key converter has been provided

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var ErrNilRandomSelector = errors.New("nil selector")

ErrNilRandomSelector signals that a nil selector was provided

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var ErrNilRandomness = errors.New("nil randomness source")

ErrNilRandomness signals that a nil randomness source has been provided

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var ErrNilShardCoordinator = errors.New("trying to set nil shard coordinator")

ErrNilShardCoordinator signals that a nil shard coordinator has been provided

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var ErrNilShuffledOutHandler = errors.New("nil shuffled out handler")

ErrNilShuffledOutHandler signals that a nil shuffled out handler has been provided

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var ErrNilShuffler = errors.New("nil nodes shuffler provided")

ErrNilShuffler signals that a nil shuffler was provided

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var ErrNilWeights = errors.New("nil weights")

ErrNilWeights signals that nil weights list was provided

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var ErrNoPubKeys = errors.New("no public keys defined")

ErrNoPubKeys signals an error when public keys are missing

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var ErrNodesSizeSmallerThanMinNoOfNodes = errors.New("length of nodes defined is smaller than min nodes per shard required")

ErrNodesSizeSmallerThanMinNoOfNodes signals that there are not enough nodes defined in genesis file

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var ErrNotImplemented = errors.New("feature not implemented")

ErrNotImplemented signals a call of a non implemented functionality

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var ErrPublicKeyNotFoundInGenesis = errors.New("public key is not valid, it is missing from genesis file")

ErrPublicKeyNotFoundInGenesis signals an error when the public key is not in genesis file

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var ErrShardIdOutOfRange = errors.New("shard id out of range")

ErrShardIdOutOfRange signals an error when shard id is out of range

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var ErrSmallMetachainEligibleListSize = errors.New("small metachain eligible list size")

ErrSmallMetachainEligibleListSize signals that the eligible validators list's size is less than the consensus size

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var ErrSmallShardEligibleListSize = errors.New("small shard eligible list size")

ErrSmallShardEligibleListSize signals that the eligible validators list's size is less than the consensus size

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var ErrValidatorNotFound = errors.New("validator not found")

ErrValidatorNotFound signals that the validator has not been found

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var ErrWrongTypeAssertion = errors.New("wrong type assertion")

ErrWrongTypeAssertion signals wrong type assertion error

Functions

func NewIndexHashedNodesCoordinator 

func NewIndexHashedNodesCoordinator(arguments ArgNodesCoordinator) (*indexHashedNodesCoordinator, error)

NewIndexHashedNodesCoordinator creates a new index hashed group selector

func NewIndexHashedNodesCoordinatorWithRater 

func NewIndexHashedNodesCoordinatorWithRater(
	indexNodesCoordinator *indexHashedNodesCoordinator,
	chanceComputer ChanceComputer,
) (*indexHashedNodesCoordinatorWithRater, error)

NewIndexHashedNodesCoordinatorWithRater creates a new index hashed group selector

func NewMultiShardCoordinator 

func NewMultiShardCoordinator(numberOfShards, selfId uint32) (*multiShardCoordinator, error)

NewMultiShardCoordinator returns a new multiShardCoordinator and initializes the masks

func NewSelectorExpandedList added in v0.0.5 

func NewSelectorExpandedList(weightList []uint32, hasher hashing.Hasher) (*selectorExpandedList, error)

NewSelectorExpandedList creates a new selector initializing selection set to the given lists of validators and expanding it according to each validator weight.

func NewSelectorWRS added in v0.0.5 

func NewSelectorWRS(weightList []uint32, hasher hashing.Hasher) (*selectorWRS, error)

NewSelectorWRS creates a new selector initializing selection set to the given lists of weights

func NewShuffledOutTrigger added in v1.0.103 

func NewShuffledOutTrigger(
	ownPubKey []byte,
	currentShardID uint32,
	endProcessHandler func(argument endProcess.ArgEndProcess) error,
) (*shuffledOutTrigger, error)

NewShuffledOutTrigger returns a new instance of shuffledOutTrigger

func NewValidator 

func NewValidator(pubKey []byte, chances uint32, index uint32) (*validator, error)

NewValidator creates a new instance of a validator

func NewXorValidatorsShuffler 

func NewXorValidatorsShuffler(
	nodesShard uint32,
	nodesMeta uint32,
	hysteresis float32,
	adaptivity bool,
	shuffleBetweenShards bool,
) *randXORShuffler

NewXorValidatorsShuffler creates a validator shuffler that uses a XOR between validator key and a given random number to do the shuffling

func NodesInfoToValidators added in v1.0.102 

func NodesInfoToValidators(nodesInfo map[uint32][]GenesisNodeInfoHandler) (map[uint32][]Validator, error)

NodesInfoToValidators maps nodeInfo to validator interface

func SerializableValidatorsToValidators added in v1.0.111 

func SerializableValidatorsToValidators(nodeRegistryValidators map[string][]*SerializableValidator) (map[uint32][]Validator, error)

Types

type ArgNodesCoordinator 

type ArgNodesCoordinator struct {
	ShardConsensusGroupSize int
	MetaConsensusGroupSize  int
	Marshalizer             marshal.Marshalizer
	Hasher                  hashing.Hasher
	Shuffler                NodesShuffler
	EpochStartNotifier      EpochStartEventNotifier
	BootStorer              storage.Storer
	ShardIDAsObserver       uint32
	NbShards                uint32
	EligibleNodes           map[uint32][]Validator
	WaitingNodes            map[uint32][]Validator
	SelfPublicKey           []byte
	Epoch                   uint32
	ConsensusGroupCache     Cacher
	ShuffledOutHandler      ShuffledOutHandler
}

ArgNodesCoordinator holds all dependencies required by the nodes coordinator in order to create new instances

type ArgsUpdateNodes 

type ArgsUpdateNodes struct {
	Eligible          map[uint32][]Validator
	Waiting           map[uint32][]Validator
	NewNodes          []Validator
	UnStakeLeaving    []Validator
	AdditionalLeaving []Validator
	Rand              []byte
	NbShards          uint32
}

ArgsUpdateNodes holds the parameters required by the shuffler to generate a new nodes configuration

type Cacher 

type Cacher interface {
	// Clear is used to completely clear the cache.
	Clear()
	// Put adds a value to the cache.  Returns true if an eviction occurred.
	Put(key []byte, value interface{}, sizeInBytes int) (evicted bool)
	// Get looks up a key's value from the cache.
	Get(key []byte) (value interface{}, ok bool)
}

Cacher provides the capabilities needed to store and retrieve information needed in the NodesCoordinator

type ChanceComputer 

type ChanceComputer interface {
	//GetChance returns the chances for the the rating
	GetChance(uint32) uint32
	//IsInterfaceNil verifies if the interface is nil
	IsInterfaceNil() bool
}

ChanceComputer provides chance computation capabilities based on a rating

type Coordinator 

type Coordinator interface {
	NumberOfShards() uint32
	ComputeId(address []byte) uint32
	SelfId() uint32
	SameShard(firstAddress, secondAddress []byte) bool
	CommunicationIdentifier(destShardID uint32) string
	IsInterfaceNil() bool
}

Coordinator defines what a shard state coordinator should hold

type CrossShardValidatorDistributor added in v1.0.115 

type CrossShardValidatorDistributor struct{}

CrossShardValidatorDistributor - distributes validators from source to destination cross shards

func (*CrossShardValidatorDistributor) DistributeValidators added in v1.0.115 

func (vd *CrossShardValidatorDistributor) DistributeValidators(
	destination map[uint32][]Validator,
	source map[uint32][]Validator,
	rand []byte,
) error

func (*CrossShardValidatorDistributor) IsInterfaceNil added in v1.0.115 

func (vd *CrossShardValidatorDistributor) IsInterfaceNil() bool

IsInterfaceNil - verifies if the interface is nil

type EpochHandler 

type EpochHandler interface {
	MetaEpoch() uint32
	IsInterfaceNil() bool
}

EpochHandler defines what a component which handles current epoch should be able to do

type EpochStartActionHandler added in v1.0.102 

type EpochStartActionHandler interface {
	EpochStartAction(hdr data.HeaderHandler)
	EpochStartPrepare(metaHdr data.HeaderHandler, body data.BodyHandler)
	NotifyOrder() uint32
}

EpochStartActionHandler defines the action taken on epoch start event

type EpochStartEventNotifier added in v1.0.102 

type EpochStartEventNotifier interface {
	RegisterHandler(handler epochStart.ActionHandler)
	UnregisterHandler(handler epochStart.ActionHandler)
	IsInterfaceNil() bool
}

EpochStartEventNotifier provides Register and Unregister functionality for the end of epoch events

type EpochValidators 

type EpochValidators struct {
	EligibleValidators map[string][]*SerializableValidator `json:"eligibleValidators"`
	WaitingValidators  map[string][]*SerializableValidator `json:"waitingValidators"`
	LeavingValidators  map[string][]*SerializableValidator `json:"leavingValidators"`
}

EpochValidators holds one epoch configuration for a nodes coordinator

type GenesisNodeInfoHandler added in v1.0.102 

type GenesisNodeInfoHandler interface {
	AssignedShard() uint32
	AddressBytes() []byte
	PubKeyBytes() []byte
	IsInterfaceNil() bool
}

GenesisNodeInfoHandler defines the public methods for the genesis nodes info

type GenesisNodesSetupHandler added in v1.0.102 

type GenesisNodesSetupHandler interface {
	InitialNodesInfoForShard(shardId uint32) ([]GenesisNodeInfoHandler, []GenesisNodeInfoHandler, error)
	InitialNodesInfo() (map[uint32][]GenesisNodeInfoHandler, map[uint32][]GenesisNodeInfoHandler)
	GetStartTime() int64
	GetRoundDuration() uint64
	GetChainId() string
	GetShardConsensusGroupSize() uint32
	GetMetaConsensusGroupSize() uint32
	NumberOfShards() uint32
	MinNumberOfNodes() uint32
	IsInterfaceNil() bool
}

GenesisNodesSetupHandler returns the genesis nodes info

type InitialNode 

type InitialNode struct {
	PubKey  string `json:"pubkey"`
	Address string `json:"address"`
	NodeInfo
}

InitialNode holds data from json

type IntraShardValidatorDistributor added in v1.0.115 

type IntraShardValidatorDistributor struct{}

IntraShardValidatorDistributor - distributes validators from source to destination inside the same shard

func (*IntraShardValidatorDistributor) DistributeValidators added in v1.0.115 

func (vd *IntraShardValidatorDistributor) DistributeValidators(
	destination map[uint32][]Validator,
	source map[uint32][]Validator,
	_ []byte,
) error

func (*IntraShardValidatorDistributor) IsInterfaceNil added in v1.0.115 

func (vd *IntraShardValidatorDistributor) IsInterfaceNil() bool

IsInterfaceNil - verifies if the interface is nil

type NodeInfo 

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

NodeInfo holds node info

func (*NodeInfo) AddressBytes added in v1.0.115 

func (ni *NodeInfo) AddressBytes() []byte

AddressBytes gets the node address as bytes

func (*NodeInfo) AssignedShard 

func (ni *NodeInfo) AssignedShard() uint32

AssignedShard gets the node assigned shard

func (*NodeInfo) IsInterfaceNil added in v1.0.102 

func (ni *NodeInfo) IsInterfaceNil() bool

IsInterfaceNil returns true if underlying object is nil

func (*NodeInfo) PubKeyBytes added in v1.0.115 

func (ni *NodeInfo) PubKeyBytes() []byte

PubKeyBytes gets the node public key as bytes

type NodesCoordinator 

type NodesCoordinator interface {
	NodesCoordinatorHelper
	PublicKeysSelector
	ComputeConsensusGroup(randomness []byte, round uint64, shardId uint32, epoch uint32) (validatorsGroup []Validator, err error)
	GetValidatorWithPublicKey(publicKey []byte, epoch uint32) (validator Validator, shardId uint32, err error)
	LoadState(key []byte) error
	GetSavedStateKey() []byte
	ShardIdForEpoch(epoch uint32) (uint32, error)
	ShuffleOutForEpoch(_ uint32)
	GetConsensusWhitelistedNodes(epoch uint32) (map[string]struct{}, error)
	ConsensusGroupSize(uint32) int
	GetNumTotalEligible() uint64
	IsInterfaceNil() bool
}

NodesCoordinator defines the behaviour of a struct able to do validator group selection

type NodesCoordinatorHelper added in v0.0.5 

type NodesCoordinatorHelper interface {
	ValidatorsWeights(validators []Validator) ([]uint32, error)
	ComputeAdditionalLeaving(allValidators []*state.ShardValidatorInfo) (map[uint32][]Validator, error)
	GetChance(uint32) uint32
}

NodesCoordinatorHelper provides polymorphism functionality for nodesCoordinator

type NodesCoordinatorRegistry 

type NodesCoordinatorRegistry struct {
	EpochsConfig map[string]*EpochValidators `json:"epochConfigs"`
	CurrentEpoch uint32                      `json:"currentEpoch"`
}

NodesCoordinatorRegistry holds the data that can be used to initialize a nodes coordinator

type NodesSetup 

type NodesSetup struct {
	StartTime          int64  `json:"startTime"`
	RoundDuration      uint64 `json:"roundDuration"`
	ConsensusGroupSize uint32 `json:"consensusGroupSize"`
	MinNodesPerShard   uint32 `json:"minNodesPerShard"`
	ChainID            string `json:"chainID"`

	MetaChainConsensusGroupSize uint32  `json:"metaChainConsensusGroupSize"`
	MetaChainMinNodes           uint32  `json:"metaChainMinNodes"`
	Hysteresis                  float32 `json:"hysteresis"`
	Adaptivity                  bool    `json:"adaptivity"`

	InitialNodes []*InitialNode `json:"initialNodes"`
	// contains filtered or unexported fields
}

NodesSetup hold data for decoded data from json file

func NewNodesSetup 

func NewNodesSetup(
	nodesFilePath string,
	addressPubkeyConverter core.PubkeyConverter,
	validatorPubkeyConverter core.PubkeyConverter,
) (*NodesSetup, error)

NewNodesSetup creates a new decoded nodes structure from json config file

func (*NodesSetup) AllInitialNodes added in v1.0.115 

func (ns *NodesSetup) AllInitialNodes() []GenesisNodeInfoHandler

AllInitialNodes returns all initial nodes loaded

func (*NodesSetup) GetChainId added in v1.0.102 

func (ns *NodesSetup) GetChainId() string

GetChainId returns the chain ID

func (*NodesSetup) GetMetaConsensusGroupSize added in v1.0.102 

func (ns *NodesSetup) GetMetaConsensusGroupSize() uint32

GetMetaConsensusGroupSize returns the metachain consensus group size

func (*NodesSetup) GetRoundDuration added in v1.0.102 

func (ns *NodesSetup) GetRoundDuration() uint64

GetRoundDuration returns the round duration

func (*NodesSetup) GetShardConsensusGroupSize added in v1.0.102 

func (ns *NodesSetup) GetShardConsensusGroupSize() uint32

GetShardConsensusGroupSize returns the shard consensus group size

func (*NodesSetup) GetShardIDForPubKey 

func (ns *NodesSetup) GetShardIDForPubKey(pubKey []byte) (uint32, error)

GetShardIDForPubKey returns the allocated shard ID from public key

func (*NodesSetup) GetStartTime added in v1.0.102 

func (ns *NodesSetup) GetStartTime() int64

GetStartTime returns the start time

func (*NodesSetup) InitialEligibleNodesPubKeysForShard 

func (ns *NodesSetup) InitialEligibleNodesPubKeysForShard(shardId uint32) ([]string, error)

InitialEligibleNodesPubKeysForShard - gets initial nodes public keys for shard

func (*NodesSetup) InitialNodesInfo 

func (ns *NodesSetup) InitialNodesInfo() (map[uint32][]GenesisNodeInfoHandler, map[uint32][]GenesisNodeInfoHandler)

InitialNodesInfo - gets initial nodes info

func (*NodesSetup) InitialNodesInfoForShard 

func (ns *NodesSetup) InitialNodesInfoForShard(shardId uint32) ([]GenesisNodeInfoHandler, []GenesisNodeInfoHandler, error)

InitialNodesInfoForShard - gets initial nodes info for shard

func (*NodesSetup) InitialNodesPubKeys 

func (ns *NodesSetup) InitialNodesPubKeys() map[uint32][]string

InitialNodesPubKeys - gets initial nodes public keys

func (*NodesSetup) IsInterfaceNil added in v1.0.102 

func (ns *NodesSetup) IsInterfaceNil() bool

IsInterfaceNil returns true if underlying object is nil

func (*NodesSetup) MinNumberOfNodes added in v1.0.110 

func (ns *NodesSetup) MinNumberOfNodes() uint32

MinNumberOfNodes returns the minimum number of nodes

func (*NodesSetup) NumberOfShards 

func (ns *NodesSetup) NumberOfShards() uint32

NumberOfShards returns the calculated number of shards

type NodesShuffler 

type NodesShuffler interface {
	UpdateParams(numNodesShard uint32, numNodesMeta uint32, hysteresis float32, adaptivity bool)
	UpdateNodeLists(args ArgsUpdateNodes) (*ResUpdateNodes, error)
	IsInterfaceNil() bool
}

NodesShuffler provides shuffling functionality for nodes

type OneShardCoordinator 

type OneShardCoordinator struct{}

OneShardCoordinator creates a shard coordinator object

func (*OneShardCoordinator) CommunicationIdentifier 

func (osc *OneShardCoordinator) CommunicationIdentifier(destShardID uint32) string

CommunicationIdentifier returns the identifier between current shard ID and destination shard ID for this implementation, it will always return "_0" as there is a single shard

func (*OneShardCoordinator) ComputeId 

func (osc *OneShardCoordinator) ComputeId(_ []byte) uint32

ComputeId gets shard for the given address

func (*OneShardCoordinator) IsInterfaceNil 

func (osc *OneShardCoordinator) IsInterfaceNil() bool

IsInterfaceNil returns true if there is no value under the interface

func (*OneShardCoordinator) NumberOfShards 

func (osc *OneShardCoordinator) NumberOfShards() uint32

NumberOfShards gets number of shards

func (*OneShardCoordinator) SameShard 

func (osc *OneShardCoordinator) SameShard(_, _ []byte) bool

SameShard returns weather two addresses belong to the same shard

func (*OneShardCoordinator) SelfId 

func (osc *OneShardCoordinator) SelfId() uint32

SelfId gets shard of the current node

type PeerAccountListAndRatingHandler added in v1.0.102 

type PeerAccountListAndRatingHandler interface {
	//GetChance returns the chances for the the rating
	GetChance(uint32) uint32
	//GetStartRating gets the start rating values
	GetStartRating() uint32
	//GetSignedBlocksThreshold gets the threshold for the minimum signed blocks
	GetSignedBlocksThreshold() float32
	//ComputeIncreaseProposer computes the new rating for the increaseLeader
	ComputeIncreaseProposer(shardId uint32, currentRating uint32) uint32
	//ComputeDecreaseProposer computes the new rating for the decreaseLeader
	ComputeDecreaseProposer(shardId uint32, currentRating uint32, consecutiveMisses uint32) uint32
	//RevertIncreaseValidator computes the new rating if a revert for increaseProposer should be done
	RevertIncreaseValidator(shardId uint32, currentRating uint32, nrReverts uint32) uint32
	//ComputeIncreaseValidator computes the new rating for the increaseValidator
	ComputeIncreaseValidator(shardId uint32, currentRating uint32) uint32
	//ComputeDecreaseValidator computes the new rating for the decreaseValidator
	ComputeDecreaseValidator(shardId uint32, currentRating uint32) uint32
	IsInterfaceNil() bool
}

PeerAccountListAndRatingHandler provides Rating Computation Capabilites for the Nodes Coordinator and ValidatorStatistics

type PublicKeysSelector 

type PublicKeysSelector interface {
	GetValidatorsIndexes(publicKeys []string, epoch uint32) ([]uint64, error)
	GetAllEligibleValidatorsPublicKeys(epoch uint32) (map[uint32][][]byte, error)
	GetAllWaitingValidatorsPublicKeys(epoch uint32) (map[uint32][][]byte, error)
	GetAllLeavingValidatorsPublicKeys(epoch uint32) (map[uint32][][]byte, error)
	GetConsensusValidatorsPublicKeys(randomness []byte, round uint64, shardId uint32, epoch uint32) ([]string, error)
	GetOwnPublicKey() []byte
}

PublicKeysSelector allows retrieval of eligible validators public keys

type RandomSelector added in v0.0.5 

type RandomSelector interface {
	Select(randSeed []byte, sampleSize uint32) ([]uint32, error)
	IsInterfaceNil() bool
}

RandomSelector selects randomly a subset of elements from a set of data

type ResUpdateNodes added in v1.0.110 

type ResUpdateNodes struct {
	Eligible       map[uint32][]Validator
	Waiting        map[uint32][]Validator
	Leaving        []Validator
	StillRemaining []Validator
}

ResUpdateNodes holds the result of the UpdateNodes method

type SelectionBasedProvider 

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

SelectionBasedProvider will handle the returning of the consensus group by simulating a reslicing of the expanded eligible list. A comparison between a real reslicing and this can be found in common_test.go

func NewSelectionBasedProvider 

func NewSelectionBasedProvider(hasher hashing.Hasher, maxSize uint32) *SelectionBasedProvider

NewSelectionBasedProvider will return a new instance of SelectionBasedProvider

func (*SelectionBasedProvider) Get 

func (sbp *SelectionBasedProvider) Get(randomness []byte, numValidators int64, expandedEligibleList []uint32) ([]uint32, error)

Get will return the consensus group based on the randomness. After an item is chosen, it is added to the slice so it won't be selected again so next time a new item is needed, the index is recalculated until the validator doesn't exist in that slice

type SerializableValidator 

type SerializableValidator struct {
	PubKey  []byte `json:"pubKey"`
	Chances uint32 `json:"chances"`
	Index   uint32 `json:"index"`
}

SerializableValidator holds the minimal data required for marshalling and un-marshalling a validator

func ValidatorArrayToSerializableValidatorArray added in v1.0.102 

func ValidatorArrayToSerializableValidatorArray(validators []Validator) []*SerializableValidator

ValidatorArrayToSerializableValidatorArray -

type ShuffledOutHandler added in v1.0.103 

type ShuffledOutHandler interface {
	Process(newShardID uint32) error
	RegisterHandler(handler func(newShardID uint32))
	CurrentShardID() uint32
	IsInterfaceNil() bool
}

ShuffledOutHandler defines the methods needed for the computation of a shuffled out event

type Validator 

type Validator interface {
	PubKey() []byte
	Chances() uint32
	Index() uint32
	Size() int
}

Validator defines a node that can be allocated to a shard for participation in a consensus group as validator or block proposer

func SerializableShardValidatorListToValidatorList added in v1.0.111 

func SerializableShardValidatorListToValidatorList(shardValidators []*SerializableValidator) ([]Validator, error)

type ValidatorsDistributor added in v1.0.115 

type ValidatorsDistributor interface {
	DistributeValidators(destination map[uint32][]Validator, source map[uint32][]Validator, rand []byte) error
	IsInterfaceNil() bool
}

ValidatorsDistributor distributes validators across shards

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