les

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Version: v2.2.26+incompatible Latest Latest
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Published: Jan 22, 2019 License: GPL-3.0 Imports: 53 Imported by: 0

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Overview

Package les implements the Light GoChain Subprotocol.

Package light implements on-demand retrieval capable state and chain objects for the Ethereum Light Client.

Package les implements the Light Ethereum Subprotocol.

Package les implements the Light Ethereum Subprotocol.

Package light implements on-demand retrieval capable state and chain objects for the Ethereum Light Client.

Package les implements the Light GoChain Subprotocol.

Package les implements the Light Ethereum Subprotocol.

Package les implements the Light Ethereum Subprotocol.

Package light implements on-demand retrieval capable state and chain objects for the Ethereum Light Client.

Package les implements the Light GoChain Subprotocol.

Package les implements the Light Ethereum Subprotocol.

Index

Constants

View Source
const (
	MaxHeaderFetch           = 192 // Amount of block headers to be fetched per retrieval request
	MaxBodyFetch             = 32  // Amount of block bodies to be fetched per retrieval request
	MaxReceiptFetch          = 128 // Amount of transaction receipts to allow fetching per request
	MaxCodeFetch             = 64  // Amount of contract codes to allow fetching per request
	MaxProofsFetch           = 64  // Amount of merkle proofs to be fetched per retrieval request
	MaxHelperTrieProofsFetch = 64  // Amount of merkle proofs to be fetched per retrieval request
	MaxTxSend                = 64  // Amount of transactions to be send per request
	MaxTxStatus              = 256 // Amount of transactions to queried per request

)
View Source
const (
	MsgBlockBodies = iota
	MsgCode
	MsgReceipts
	MsgProofsV1
	MsgProofsV2
	MsgHeaderProofs
	MsgHelperTrieProofs
)
View Source
const (
	NetworkId          = 1
	ProtocolMaxMsgSize = 10 * 1024 * 1024 // Maximum cap on the size of a protocol message
)
View Source
const (
	// Protocol messages belonging to LPV1
	StatusMsg          = 0x00
	AnnounceMsg        = 0x01
	GetBlockHeadersMsg = 0x02
	BlockHeadersMsg    = 0x03
	GetBlockBodiesMsg  = 0x04
	BlockBodiesMsg     = 0x05
	GetReceiptsMsg     = 0x06
	ReceiptsMsg        = 0x07
	GetProofsV1Msg     = 0x08
	ProofsV1Msg        = 0x09
	GetCodeMsg         = 0x0a
	CodeMsg            = 0x0b
	SendTxMsg          = 0x0c
	GetHeaderProofsMsg = 0x0d
	HeaderProofsMsg    = 0x0e
	// Protocol messages belonging to LPV2
	GetProofsV2Msg         = 0x0f
	ProofsV2Msg            = 0x10
	GetHelperTrieProofsMsg = 0x11
	HelperTrieProofsMsg    = 0x12
	SendTxV2Msg            = 0x13
	GetTxStatusMsg         = 0x14
	TxStatusMsg            = 0x15
)

les protocol message codes

View Source
const (
	ErrMsgTooLarge = iota
	ErrDecode
	ErrInvalidMsgCode
	ErrProtocolVersionMismatch
	ErrNetworkIdMismatch
	ErrGenesisBlockMismatch
	ErrNoStatusMsg
	ErrExtraStatusMsg
	ErrSuspendedPeer
	ErrUselessPeer
	ErrRequestRejected
	ErrUnexpectedResponse
	ErrInvalidResponse
	ErrTooManyTimeouts
	ErrMissingKey
)

Variables

View Source
var (
	ClientProtocolVersions    = []uint{lpv2, lpv1}
	ServerProtocolVersions    = []uint{lpv2, lpv1}
	AdvertiseProtocolVersions = []uint{lpv2} // clients are searching for the first advertised protocol in the list
)

Supported versions of the les protocol (first is primary)

View Source
var ErrNoPeers = errors.New("no suitable peers available")

ErrNoPeers is returned if no peers capable of serving a queued request are available

View Source
var ProtocolLengths = map[uint]uint64{/* contains filtered or unexported fields */}

Number of implemented message corresponding to different protocol versions.

Functions

This section is empty.

Types

type BlockChain

type BlockChain interface {
	Config() *params.ChainConfig
	HasHeader(hash common.Hash, number uint64) bool
	GetHeader(hash common.Hash, number uint64) *types.Header
	GetHeaderByHash(hash common.Hash) *types.Header
	CurrentHeader() *types.Header
	GetTd(hash common.Hash, number uint64) *big.Int
	State() (*state.StateDB, error)
	InsertHeaderChain(ctx context.Context, chain []*types.Header, checkFreq int) (int, error)
	Rollback(chain []common.Hash)
	GetHeaderByNumber(number uint64) *types.Header
	GetAncestor(hash common.Hash, number, ancestor uint64, maxNonCanonical *uint64) (common.Hash, uint64)
	Genesis() *types.Block
	SubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent, name string)
	UnsubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent)
}

type BlockRequest

type BlockRequest light.BlockRequest

BlockRequest is the ODR request type for block bodies

func (*BlockRequest) CanSend

func (r *BlockRequest) CanSend(peer *peer) bool

CanSend tells if a certain peer is suitable for serving the given request

func (*BlockRequest) GetCost

func (r *BlockRequest) GetCost(peer *peer) uint64

GetCost returns the cost of the given ODR request according to the serving peer's cost table (implementation of LesOdrRequest)

func (*BlockRequest) Request

func (r *BlockRequest) Request(ctx context.Context, reqID uint64, peer *peer) error

Request sends an ODR request to the LES network (implementation of LesOdrRequest)

func (*BlockRequest) Validate

func (r *BlockRequest) Validate(db common.Database, msg *Msg) error

Valid processes an ODR request reply message from the LES network returns true and stores results in memory if the message was a valid reply to the request (implementation of LesOdrRequest)

type BloomReq

type BloomReq struct {
	BloomTrieNum, BitIdx, SectionIdx, FromLevel uint64
}

type BloomRequest

type BloomRequest light.BloomRequest

ODR request type for requesting headers by Canonical Hash Trie, see LesOdrRequest interface

func (*BloomRequest) CanSend

func (r *BloomRequest) CanSend(peer *peer) bool

CanSend tells if a certain peer is suitable for serving the given request

func (*BloomRequest) GetCost

func (r *BloomRequest) GetCost(peer *peer) uint64

GetCost returns the cost of the given ODR request according to the serving peer's cost table (implementation of LesOdrRequest)

func (*BloomRequest) Request

func (r *BloomRequest) Request(ctx context.Context, reqID uint64, peer *peer) error

Request sends an ODR request to the LES network (implementation of LesOdrRequest)

func (*BloomRequest) Validate

func (r *BloomRequest) Validate(db common.Database, msg *Msg) error

Valid processes an ODR request reply message from the LES network returns true and stores results in memory if the message was a valid reply to the request (implementation of LesOdrRequest)

type ChtReq

type ChtReq struct {
	ChtNum, BlockNum uint64
	FromLevel        uint
}

legacy LES/1

type ChtRequest

type ChtRequest light.ChtRequest

ODR request type for requesting headers by Canonical Hash Trie, see LesOdrRequest interface

func (*ChtRequest) CanSend

func (r *ChtRequest) CanSend(peer *peer) bool

CanSend tells if a certain peer is suitable for serving the given request

func (*ChtRequest) GetCost

func (r *ChtRequest) GetCost(peer *peer) uint64

GetCost returns the cost of the given ODR request according to the serving peer's cost table (implementation of LesOdrRequest)

func (*ChtRequest) Request

func (r *ChtRequest) Request(ctx context.Context, reqID uint64, peer *peer) error

Request sends an ODR request to the LES network (implementation of LesOdrRequest)

func (*ChtRequest) Validate

func (r *ChtRequest) Validate(db common.Database, msg *Msg) error

Valid processes an ODR request reply message from the LES network returns true and stores results in memory if the message was a valid reply to the request (implementation of LesOdrRequest)

type ChtResp

type ChtResp struct {
	Header *types.Header
	Proof  []rlp.RawValue
}

legacy LES/1

type CodeData

type CodeData []struct {
	Value []byte
}

CodeData is the network response packet for a node data retrieval.

type CodeReq

type CodeReq struct {
	BHash  common.Hash
	AccKey []byte
}

type CodeRequest

type CodeRequest light.CodeRequest

ODR request type for node data (used for retrieving contract code), see LesOdrRequest interface

func (*CodeRequest) CanSend

func (r *CodeRequest) CanSend(peer *peer) bool

CanSend tells if a certain peer is suitable for serving the given request

func (*CodeRequest) GetCost

func (r *CodeRequest) GetCost(peer *peer) uint64

GetCost returns the cost of the given ODR request according to the serving peer's cost table (implementation of LesOdrRequest)

func (*CodeRequest) Request

func (r *CodeRequest) Request(ctx context.Context, reqID uint64, peer *peer) error

Request sends an ODR request to the LES network (implementation of LesOdrRequest)

func (*CodeRequest) Validate

func (r *CodeRequest) Validate(db common.Database, msg *Msg) error

Valid processes an ODR request reply message from the LES network returns true and stores results in memory if the message was a valid reply to the request (implementation of LesOdrRequest)

type HelperTrieReq

type HelperTrieReq struct {
	Type              uint
	TrieIdx           uint64
	Key               []byte
	FromLevel, AuxReq uint
}

type HelperTrieResps

type HelperTrieResps struct {
	Proofs  light.NodeList
	AuxData [][]byte
}

type LesApiBackend

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

func (*LesApiBackend) AccountManager

func (b *LesApiBackend) AccountManager() *accounts.Manager

func (*LesApiBackend) BlockByNumber

func (b *LesApiBackend) BlockByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Block, error)

func (*LesApiBackend) BloomStatus

func (b *LesApiBackend) BloomStatus() (uint64, uint64)

func (*LesApiBackend) ChainConfig

func (b *LesApiBackend) ChainConfig() *params.ChainConfig

func (*LesApiBackend) ChainDb

func (b *LesApiBackend) ChainDb() common.Database

func (*LesApiBackend) CurrentBlock

func (b *LesApiBackend) CurrentBlock() *types.Block

func (*LesApiBackend) Downloader

func (b *LesApiBackend) Downloader() *downloader.Downloader

func (*LesApiBackend) EventMux

func (b *LesApiBackend) EventMux() *event.TypeMux

func (*LesApiBackend) GenesisAlloc

func (b *LesApiBackend) GenesisAlloc() core.GenesisAlloc

func (*LesApiBackend) GetBlock

func (b *LesApiBackend) GetBlock(ctx context.Context, blockHash common.Hash) (*types.Block, error)

func (*LesApiBackend) GetEVM

func (b *LesApiBackend) GetEVM(ctx context.Context, msg core.Message, state *state.StateDB, header *types.Header, vmCfg vm.Config) (*vm.EVM, error)

func (*LesApiBackend) GetLogs

func (b *LesApiBackend) GetLogs(ctx context.Context, hash common.Hash) ([][]*types.Log, error)

func (*LesApiBackend) GetPoolNonce

func (b *LesApiBackend) GetPoolNonce(ctx context.Context, addr common.Address) (uint64, error)

func (*LesApiBackend) GetPoolTransaction

func (b *LesApiBackend) GetPoolTransaction(txHash common.Hash) *types.Transaction

func (*LesApiBackend) GetPoolTransactions

func (b *LesApiBackend) GetPoolTransactions() types.Transactions

func (*LesApiBackend) GetReceipts

func (b *LesApiBackend) GetReceipts(ctx context.Context, hash common.Hash) (types.Receipts, error)

func (*LesApiBackend) GetTd

func (b *LesApiBackend) GetTd(blockHash common.Hash) *big.Int

func (*LesApiBackend) HeaderByHash

func (b *LesApiBackend) HeaderByHash(ctx context.Context, hash common.Hash) (*types.Header, error)

func (*LesApiBackend) HeaderByNumber

func (b *LesApiBackend) HeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Header, error)

func (*LesApiBackend) InitialSupply

func (b *LesApiBackend) InitialSupply() *big.Int

func (*LesApiBackend) ProtocolVersion

func (b *LesApiBackend) ProtocolVersion() int

func (*LesApiBackend) RemoveTx

func (b *LesApiBackend) RemoveTx(txHash common.Hash)

func (*LesApiBackend) SendTx

func (b *LesApiBackend) SendTx(ctx context.Context, signedTx *types.Transaction) error

func (*LesApiBackend) ServiceFilter

func (b *LesApiBackend) ServiceFilter(ctx context.Context, session *bloombits.MatcherSession)

func (*LesApiBackend) SetHead

func (b *LesApiBackend) SetHead(number uint64)

func (*LesApiBackend) StateAndHeaderByNumber

func (b *LesApiBackend) StateAndHeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*state.StateDB, *types.Header, error)

func (*LesApiBackend) StateQuery

func (b *LesApiBackend) StateQuery(ctx context.Context, blockNr rpc.BlockNumber, fn func(*state.StateDB) error) error

func (*LesApiBackend) Stats

func (b *LesApiBackend) Stats() (pending int, queued int)

func (*LesApiBackend) SubscribeChainEvent

func (b *LesApiBackend) SubscribeChainEvent(ch chan<- core.ChainEvent, name string)

func (*LesApiBackend) SubscribeChainHeadEvent

func (b *LesApiBackend) SubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent, name string)

func (*LesApiBackend) SubscribeChainSideEvent

func (b *LesApiBackend) SubscribeChainSideEvent(ch chan<- core.ChainSideEvent, name string)

func (*LesApiBackend) SubscribeLogsEvent

func (b *LesApiBackend) SubscribeLogsEvent(ch chan<- []*types.Log, name string)

func (*LesApiBackend) SubscribeNewTxsEvent

func (b *LesApiBackend) SubscribeNewTxsEvent(ch chan<- core.NewTxsEvent, name string)

func (*LesApiBackend) SubscribeRemovedLogsEvent

func (b *LesApiBackend) SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent, name string)

func (*LesApiBackend) SuggestPrice

func (b *LesApiBackend) SuggestPrice(ctx context.Context) (*big.Int, error)

func (*LesApiBackend) TxPoolContent

func (*LesApiBackend) UnsubscribeChainEvent

func (b *LesApiBackend) UnsubscribeChainEvent(ch chan<- core.ChainEvent)

func (*LesApiBackend) UnsubscribeChainHeadEvent

func (b *LesApiBackend) UnsubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent)

func (*LesApiBackend) UnsubscribeChainSideEvent

func (b *LesApiBackend) UnsubscribeChainSideEvent(ch chan<- core.ChainSideEvent)

func (*LesApiBackend) UnsubscribeLogsEvent

func (b *LesApiBackend) UnsubscribeLogsEvent(ch chan<- []*types.Log)

func (*LesApiBackend) UnsubscribeNewTxsEvent

func (b *LesApiBackend) UnsubscribeNewTxsEvent(ch chan<- core.NewTxsEvent)

func (*LesApiBackend) UnsubscribeRemovedLogsEvent

func (b *LesApiBackend) UnsubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent)

type LesOdr

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

LesOdr implements light.OdrBackend

func NewLesOdr

func NewLesOdr(db common.Database, chtIndexer, bloomTrieIndexer, bloomIndexer *core.ChainIndexer, retriever *retrieveManager) *LesOdr

func (*LesOdr) BloomIndexer

func (odr *LesOdr) BloomIndexer() *core.ChainIndexer

BloomIndexer returns the bloombits chain indexer

func (*LesOdr) BloomTrieIndexer

func (odr *LesOdr) BloomTrieIndexer() *core.ChainIndexer

BloomTrieIndexer returns the bloom trie chain indexer

func (*LesOdr) ChtIndexer

func (odr *LesOdr) ChtIndexer() *core.ChainIndexer

ChtIndexer returns the CHT chain indexer

func (*LesOdr) Database

func (odr *LesOdr) Database() common.Database

Database returns the backing database

func (*LesOdr) Retrieve

func (odr *LesOdr) Retrieve(ctx context.Context, req light.OdrRequest) (err error)

Retrieve tries to fetch an object from the LES network. If the network retrieval was successful, it stores the object in local db.

func (*LesOdr) Stop

func (odr *LesOdr) Stop()

Stop cancels all pending retrievals

type LesOdrRequest

type LesOdrRequest interface {
	GetCost(*peer) uint64
	CanSend(*peer) bool
	Request(context.Context, uint64, *peer) error
	Validate(common.Database, *Msg) error
}

func LesRequest

func LesRequest(req light.OdrRequest) LesOdrRequest

type LesServer

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

func NewLesServer

func NewLesServer(ctx context.Context, eth *eth.GoChain, config *eth.Config) (*LesServer, error)

func (*LesServer) Protocols

func (s *LesServer) Protocols() []p2p.Protocol

func (*LesServer) SetBloomBitsIndexer

func (s *LesServer) SetBloomBitsIndexer(bloomIndexer *core.ChainIndexer)

func (*LesServer) Start

func (s *LesServer) Start(srvr *p2p.Server)

Start starts the LES server

func (*LesServer) Stop

func (s *LesServer) Stop()

Stop stops the LES service

type LesTxRelay

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

func NewLesTxRelay

func NewLesTxRelay(ps *peerSet, reqDist *requestDistributor) *LesTxRelay

func (*LesTxRelay) Discard

func (self *LesTxRelay) Discard(hashes []common.Hash)

func (*LesTxRelay) NewHead

func (self *LesTxRelay) NewHead(head common.Hash, mined []common.Hash, rollback []common.Hash)

func (*LesTxRelay) Send

func (self *LesTxRelay) Send(txs types.Transactions)

type LightDummyAPI

type LightDummyAPI struct{}

func (*LightDummyAPI) Coinbase

func (s *LightDummyAPI) Coinbase() (common.Address, error)

Coinbase is the address that mining rewards will be send to (alias for Etherbase)

func (*LightDummyAPI) Etherbase

func (s *LightDummyAPI) Etherbase() (common.Address, error)

Etherbase is the address that mining rewards will be send to

func (*LightDummyAPI) Hashrate

func (s *LightDummyAPI) Hashrate() hexutil.Uint

Hashrate returns the POW hashrate

func (*LightDummyAPI) Mining

func (s *LightDummyAPI) Mining() bool

Mining returns an indication if this node is currently mining.

type LightGoChain

type LightGoChain struct {
	ApiBackend *LesApiBackend
	// contains filtered or unexported fields
}

func New

func New(ctx context.Context, sctx *node.ServiceContext, config *eth.Config) (*LightGoChain, error)

func (*LightGoChain) APIs

func (s *LightGoChain) APIs() []rpc.API

APIs returns the collection of RPC services the ethereum package offers. NOTE, some of these services probably need to be moved to somewhere else.

func (*LightGoChain) BlockChain

func (s *LightGoChain) BlockChain() *light.LightChain

func (*LightGoChain) Downloader

func (s *LightGoChain) Downloader() *downloader.Downloader

func (*LightGoChain) Engine

func (s *LightGoChain) Engine() consensus.Engine

func (*LightGoChain) EventMux

func (s *LightGoChain) EventMux() *event.TypeMux

func (*LightGoChain) LesVersion

func (s *LightGoChain) LesVersion() int

func (*LightGoChain) Protocols

func (s *LightGoChain) Protocols() []p2p.Protocol

Protocols implements node.Service, returning all the currently configured network protocols to start.

func (*LightGoChain) ResetWithGenesisBlock

func (s *LightGoChain) ResetWithGenesisBlock(gb *types.Block)

func (*LightGoChain) Start

func (s *LightGoChain) Start(srvr *p2p.Server) error

Start implements node.Service, starting all internal goroutines needed by the GoChain protocol implementation.

func (*LightGoChain) Stop

func (s *LightGoChain) Stop() error

Stop implements node.Service, terminating all internal goroutines used by the GoChain protocol.

func (*LightGoChain) TxPool

func (s *LightGoChain) TxPool() *light.TxPool

type Msg

type Msg struct {
	MsgType int
	ReqID   uint64
	Obj     interface{}
}

Msg encodes a LES message that delivers reply data for a request

type NodeInfo

type NodeInfo struct {
	Network    uint64              `json:"network"`    // Ethereum network ID (1=Frontier, 2=Morden, Ropsten=3, Rinkeby=4)
	Difficulty *big.Int            `json:"difficulty"` // Total difficulty of the host's blockchain
	Genesis    common.Hash         `json:"genesis"`    // SHA3 hash of the host's genesis block
	Config     *params.ChainConfig `json:"config"`     // Chain configuration for the fork rules
	Head       common.Hash         `json:"head"`       // SHA3 hash of the host's best owned block
}

NodeInfo represents a short summary of the Ethereum sub-protocol metadata known about the host peer.

type ProofReq

type ProofReq struct {
	BHash       common.Hash
	AccKey, Key []byte
	FromLevel   uint
}

type ProtocolManager

type ProtocolManager struct {
	SubProtocols []p2p.Protocol
	// contains filtered or unexported fields
}

func NewProtocolManager

func NewProtocolManager(ctx context.Context, chainConfig *params.ChainConfig, lightSync bool, protocolVersions []uint, networkId uint64, mux *event.TypeMux, peers *peerSet, blockchain BlockChain, txpool txPool, chainDb common.Database, odr *LesOdr, txrelay *LesTxRelay, quitSync chan struct{}, wg *sync.WaitGroup) (*ProtocolManager, error)

NewProtocolManager returns a new ethereum sub protocol manager. The Ethereum sub protocol manages peers capable with the ethereum network.

func (*ProtocolManager) NodeInfo

func (pm *ProtocolManager) NodeInfo() *NodeInfo

NodeInfo retrieves some protocol metadata about the running host node.

func (*ProtocolManager) Start

func (pm *ProtocolManager) Start(maxPeers int)

func (*ProtocolManager) Stop

func (pm *ProtocolManager) Stop()

type ReceiptsRequest

type ReceiptsRequest light.ReceiptsRequest

ReceiptsRequest is the ODR request type for block receipts by block hash

func (*ReceiptsRequest) CanSend

func (r *ReceiptsRequest) CanSend(peer *peer) bool

CanSend tells if a certain peer is suitable for serving the given request

func (*ReceiptsRequest) GetCost

func (r *ReceiptsRequest) GetCost(peer *peer) uint64

GetCost returns the cost of the given ODR request according to the serving peer's cost table (implementation of LesOdrRequest)

func (*ReceiptsRequest) Request

func (r *ReceiptsRequest) Request(ctx context.Context, reqID uint64, peer *peer) error

Request sends an ODR request to the LES network (implementation of LesOdrRequest)

func (*ReceiptsRequest) Validate

func (r *ReceiptsRequest) Validate(db common.Database, msg *Msg) error

Valid processes an ODR request reply message from the LES network returns true and stores results in memory if the message was a valid reply to the request (implementation of LesOdrRequest)

type RequestCostList

type RequestCostList []struct {
	MsgCode, BaseCost, ReqCost uint64
}

type TrieRequest

type TrieRequest light.TrieRequest

ODR request type for state/storage trie entries, see LesOdrRequest interface

func (*TrieRequest) CanSend

func (r *TrieRequest) CanSend(peer *peer) bool

CanSend tells if a certain peer is suitable for serving the given request

func (*TrieRequest) GetCost

func (r *TrieRequest) GetCost(peer *peer) uint64

GetCost returns the cost of the given ODR request according to the serving peer's cost table (implementation of LesOdrRequest)

func (*TrieRequest) Request

func (r *TrieRequest) Request(ctx context.Context, reqID uint64, peer *peer) error

Request sends an ODR request to the LES network (implementation of LesOdrRequest)

func (*TrieRequest) Validate

func (r *TrieRequest) Validate(db common.Database, msg *Msg) error

Valid processes an ODR request reply message from the LES network returns true and stores results in memory if the message was a valid reply to the request (implementation of LesOdrRequest)

Directories

Path Synopsis
Package flowcontrol implements a client side flow control mechanism Package flowcontrol implements a client side flow control mechanism
Package flowcontrol implements a client side flow control mechanism Package flowcontrol implements a client side flow control mechanism

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