les

package
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 Go to latest Published: Oct 11, 2018 License: GPL-3.0 Imports: 52 Imported by: 0

Documentation

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)
	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) 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, blockHash common.Hash) (types.Receipts, error)

func (*LesApiBackend) GetTd 

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

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)

func (*LesApiBackend) SubscribeChainHeadEvent 

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

func (*LesApiBackend) SubscribeChainSideEvent 

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

func (*LesApiBackend) SubscribeLogsEvent 

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

func (*LesApiBackend) SubscribeNewTxsEvent 

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

func (*LesApiBackend) SubscribeRemovedLogsEvent 

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

func (*LesApiBackend) SuggestPrice 

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

func (*LesApiBackend) TxPoolContent 

func (b *LesApiBackend) TxPoolContent(ctx context.Context) (map[common.Address]types.Transactions, map[common.Address]types.Transactions)

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)

Source Files

View all Source files

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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