light

package
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 Go to latest Published: Mar 3, 2020 License: GPL-3.0 Imports: 24 Imported by: 0

Documentation

Overview

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

Index

Constants

This section is empty.

Variables

View Source 
var (
	// DefaultServerIndexerConfig wraps a set of configs as a default indexer config for server side.
	DefaultServerIndexerConfig = &IndexerConfig{
		ChtSize:           params.CHTFrequencyServer,
		PairChtSize:       params.CHTFrequencyClient,
		ChtConfirms:       params.HelperTrieProcessConfirmations,
		BloomSize:         params.BloomBitsBlocks,
		BloomConfirms:     params.BloomConfirms,
		BloomTrieSize:     params.BloomTrieFrequency,
		BloomTrieConfirms: params.HelperTrieProcessConfirmations,
	}
	// DefaultClientIndexerConfig wraps a set of configs as a default indexer config for client side.
	DefaultClientIndexerConfig = &IndexerConfig{
		ChtSize:           params.CHTFrequencyClient,
		PairChtSize:       params.CHTFrequencyServer,
		ChtConfirms:       params.HelperTrieConfirmations,
		BloomSize:         params.BloomBitsBlocksClient,
		BloomConfirms:     params.HelperTrieConfirmations,
		BloomTrieSize:     params.BloomTrieFrequency,
		BloomTrieConfirms: params.HelperTrieConfirmations,
	}
	// TestServerIndexerConfig wraps a set of configs as a test indexer config for server side.
	TestServerIndexerConfig = &IndexerConfig{
		ChtSize:           64,
		PairChtSize:       512,
		ChtConfirms:       4,
		BloomSize:         64,
		BloomConfirms:     4,
		BloomTrieSize:     512,
		BloomTrieConfirms: 4,
	}
	// TestClientIndexerConfig wraps a set of configs as a test indexer config for client side.
	TestClientIndexerConfig = &IndexerConfig{
		ChtSize:           512,
		PairChtSize:       64,
		ChtConfirms:       32,
		BloomSize:         512,
		BloomConfirms:     32,
		BloomTrieSize:     512,
		BloomTrieConfirms: 32,
	}
)
View Source 
var (
	ErrNoTrustedCht       = errors.New("no trusted canonical hash trie")
	ErrNoTrustedBloomTrie = errors.New("no trusted bloom trie")
	ErrNoHeader           = errors.New("header not found")

	ChtTablePrefix = "cht-"
)
View Source 
var (
	BloomTrieTablePrefix = "blt-"
)
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 NoOdr = context.Background()

NoOdr is the default context passed to an ODR capable function when the ODR service is not required.

Functions

func GetBlock 

func GetBlock(ctx context.Context, odr OdrBackend, hash common.Hash, number uint64) (*types.Block, error)

GetBlock retrieves an entire block corresponding to the hash, assembling it back from the stored header and body.

func GetBlockLogs 

func GetBlockLogs(ctx context.Context, odr OdrBackend, hash common.Hash, number uint64) ([][]*types.Log, error)

GetBlockLogs retrieves the logs generated by the transactions included in a block given by its hash.

func GetBlockReceipts 

func GetBlockReceipts(ctx context.Context, odr OdrBackend, hash common.Hash, number uint64) (types.Receipts, error)

GetBlockReceipts retrieves the receipts generated by the transactions included in a block given by its hash.

func GetBloomBits 

func GetBloomBits(ctx context.Context, odr OdrBackend, bitIdx uint, sectionIdxList []uint64) ([][]byte, error)

GetBloomBits retrieves a batch of compressed bloomBits vectors belonging to the given bit index and section indexes

func GetBloomTrieRoot 

func GetBloomTrieRoot(db ethdb.Database, sectionIdx uint64, sectionHead common.Hash) common.Hash

GetBloomTrieRoot reads the BloomTrie root assoctiated to the given section from the database

func GetBody 

func GetBody(ctx context.Context, odr OdrBackend, hash common.Hash, number uint64) (*types.Body, error)

GetBody retrieves the block body (transactons, uncles) corresponding to the hash.

func GetBodyRLP 

func GetBodyRLP(ctx context.Context, odr OdrBackend, hash common.Hash, number uint64) (rlp.RawValue, error)

GetBodyRLP retrieves the block body (transactions and uncles) in RLP encoding.

func GetCanonicalHash 

func GetCanonicalHash(ctx context.Context, odr OdrBackend, number uint64) (common.Hash, error)

func GetChtRoot 

func GetChtRoot(db ethdb.Database, sectionIdx uint64, sectionHead common.Hash) common.Hash

GetChtRoot reads the CHT root associated to the given section from the database Note that sectionIdx is specified according to LES/1 CHT section size.

func GetHeaderByNumber 

func GetHeaderByNumber(ctx context.Context, odr OdrBackend, number uint64) (*types.Header, error)

func NewBloomTrieIndexer 

func NewBloomTrieIndexer(db ethdb.Database, odr OdrBackend, parentSize, size uint64) *core.ChainIndexer

NewBloomTrieIndexer creates a BloomTrie chain indexer

func NewChtIndexer 

func NewChtIndexer(db ethdb.Database, odr OdrBackend, size, confirms uint64) *core.ChainIndexer

NewChtIndexer creates a Cht chain indexer

func NewState 

func NewState(ctx context.Context, head *types.Header, odr OdrBackend) *state.StateDB

func NewStateDatabase 

func NewStateDatabase(ctx context.Context, head *types.Header, odr OdrBackend) state.Database

func StoreBloomTrieRoot 

func StoreBloomTrieRoot(db ethdb.Database, sectionIdx uint64, sectionHead, root common.Hash)

StoreBloomTrieRoot writes the BloomTrie root assoctiated to the given section into the database

func StoreChtRoot 

func StoreChtRoot(db ethdb.Database, sectionIdx uint64, sectionHead, root common.Hash)

StoreChtRoot writes the CHT root associated to the given section into the database Note that sectionIdx is specified according to LES/1 CHT section size.

Types

type BlockRequest 

type BlockRequest struct {
	OdrRequest
	Hash   common.Hash
	Number uint64
	Rlp    []byte
}

BlockRequest is the ODR request type for retrieving block bodies

func (*BlockRequest) StoreResult 

func (req *BlockRequest) StoreResult(db ethdb.Database)

StoreResult stores the retrieved data in local database

type BloomRequest 

type BloomRequest struct {
	OdrRequest
	Config           *IndexerConfig
	BloomTrieNum     uint64
	BitIdx           uint
	SectionIndexList []uint64
	BloomTrieRoot    common.Hash
	BloomBits        [][]byte
	Proofs           *NodeSet
}

BloomRequest is the ODR request type for retrieving bloom filters from a CHT structure

func (*BloomRequest) StoreResult 

func (req *BloomRequest) StoreResult(db ethdb.Database)

StoreResult stores the retrieved data in local database

type BloomTrieIndexerBackend 

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

BloomTrieIndexerBackend implements core.ChainIndexerBackend

func (*BloomTrieIndexerBackend) Commit 

func (b *BloomTrieIndexerBackend) Commit() error

Commit implements core.ChainIndexerBackend

func (*BloomTrieIndexerBackend) Process 

func (b *BloomTrieIndexerBackend) Process(ctx context.Context, header *types.Header) error

Process implements core.ChainIndexerBackend

func (*BloomTrieIndexerBackend) Reset 

func (b *BloomTrieIndexerBackend) Reset(ctx context.Context, section uint64, lastSectionHead common.Hash) error

Reset implements core.ChainIndexerBackend

type ChtIndexerBackend 

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

ChtIndexerBackend implements core.ChainIndexerBackend.

func (*ChtIndexerBackend) Commit 

func (c *ChtIndexerBackend) Commit() error

Commit implements core.ChainIndexerBackend

func (*ChtIndexerBackend) Process 

func (c *ChtIndexerBackend) Process(ctx context.Context, header *types.Header) error

Process implements core.ChainIndexerBackend

func (*ChtIndexerBackend) Reset 

func (c *ChtIndexerBackend) Reset(ctx context.Context, section uint64, lastSectionHead common.Hash) error

Reset implements core.ChainIndexerBackend

type ChtNode 

type ChtNode struct {
	Hash common.Hash
	Td   *big.Int
}

ChtNode structures are stored in the Canonical Hash Trie in an RLP encoded format

type ChtRequest 

type ChtRequest struct {
	OdrRequest
	Config           *IndexerConfig
	ChtNum, BlockNum uint64
	ChtRoot          common.Hash
	Header           *types.Header
	Td               *big.Int
	Proof            *NodeSet
}

ChtRequest is the ODR request type for state/storage trie entries

func (*ChtRequest) StoreResult 

func (req *ChtRequest) StoreResult(db ethdb.Database)

StoreResult stores the retrieved data in local database

type CodeRequest 

type CodeRequest struct {
	OdrRequest
	Id   *TrieID // references storage trie of the account
	Hash common.Hash
	Data []byte
}

CodeRequest is the ODR request type for retrieving contract code

func (*CodeRequest) StoreResult 

func (req *CodeRequest) StoreResult(db ethdb.Database)

StoreResult stores the retrieved data in local database

type IndexerConfig 

type IndexerConfig struct {
	// The block frequency for creating CHTs.
	ChtSize uint64

	// A special auxiliary field represents client's chtsize for server config, otherwise represents server's chtsize.
	PairChtSize uint64

	// The number of confirmations needed to generate/accept a canonical hash help trie.
	ChtConfirms uint64

	// The block frequency for creating new bloom bits.
	BloomSize uint64

	// The number of confirmation needed before a bloom section is considered probably final and its rotated bits
	// are calculated.
	BloomConfirms uint64

	// The block frequency for creating BloomTrie.
	BloomTrieSize uint64

	// The number of confirmations needed to generate/accept a bloom trie.
	BloomTrieConfirms uint64
}

IndexerConfig includes a set of configs for chain indexers.

type LightChain 

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

LightChain represents a canonical chain that by default only handles block headers, downloading block bodies and receipts on demand through an ODR interface. It only does header validation during chain insertion.

func NewLightChain 

func NewLightChain(odr OdrBackend, config *params.ChainConfig, engine consensus.Engine) (*LightChain, error)

NewLightChain returns a fully initialised light chain using information available in the database. It initialises the default Ethereum header validator.

func (*LightChain) Config 

func (self *LightChain) Config() *params.ChainConfig

Config retrieves the header chain's chain configuration.

func (*LightChain) CurrentHeader 

func (self *LightChain) CurrentHeader() *types.Header

CurrentHeader retrieves the current head header of the canonical chain. The header is retrieved from the HeaderChain's internal cache.

func (*LightChain) Engine 

func (bc *LightChain) Engine() consensus.Engine

Engine retrieves the light chain's consensus engine.

func (*LightChain) GasLimit 

func (self *LightChain) GasLimit() uint64

GasLimit returns the gas limit of the current HEAD block.

func (*LightChain) Genesis 

func (bc *LightChain) Genesis() *types.Block

Genesis returns the genesis block

func (*LightChain) GetAncestor 

func (bc *LightChain) GetAncestor(hash common.Hash, number, ancestor uint64, maxNonCanonical *uint64) (common.Hash, uint64)

GetAncestor retrieves the Nth ancestor of a given block. It assumes that either the given block or a close ancestor of it is canonical. maxNonCanonical points to a downwards counter limiting the number of blocks to be individually checked before we reach the canonical chain.

Note: ancestor == 0 returns the same block, 1 returns its parent and so on.

func (*LightChain) GetBlock 

func (self *LightChain) GetBlock(ctx context.Context, hash common.Hash, number uint64) (*types.Block, error)

GetBlock retrieves a block from the database or ODR service by hash and number, caching it if found.

func (*LightChain) GetBlockByHash 

func (self *LightChain) GetBlockByHash(ctx context.Context, hash common.Hash) (*types.Block, error)

GetBlockByHash retrieves a block from the database or ODR service by hash, caching it if found.

func (*LightChain) GetBlockByNumber 

func (self *LightChain) GetBlockByNumber(ctx context.Context, number uint64) (*types.Block, error)

GetBlockByNumber retrieves a block from the database or ODR service by number, caching it (associated with its hash) if found.

func (*LightChain) GetBlockHashesFromHash 

func (self *LightChain) GetBlockHashesFromHash(hash common.Hash, max uint64) []common.Hash

GetBlockHashesFromHash retrieves a number of block hashes starting at a given hash, fetching towards the genesis block.

func (*LightChain) GetBody 

func (self *LightChain) GetBody(ctx context.Context, hash common.Hash) (*types.Body, error)

GetBody retrieves a block body (transactions and uncles) from the database or ODR service by hash, caching it if found.

func (*LightChain) GetBodyRLP 

func (self *LightChain) GetBodyRLP(ctx context.Context, hash common.Hash) (rlp.RawValue, error)

GetBodyRLP retrieves a block body in RLP encoding from the database or ODR service by hash, caching it if found.

func (*LightChain) GetHeader 

func (self *LightChain) GetHeader(hash common.Hash, number uint64) *types.Header

GetHeader retrieves a block header from the database by hash and number, caching it if found.

func (*LightChain) GetHeaderByHash 

func (self *LightChain) GetHeaderByHash(hash common.Hash) *types.Header

GetHeaderByHash retrieves a block header from the database by hash, caching it if found.

func (*LightChain) GetHeaderByNumber 

func (self *LightChain) GetHeaderByNumber(number uint64) *types.Header

GetHeaderByNumber retrieves a block header from the database by number, caching it (associated with its hash) if found.

func (*LightChain) GetHeaderByNumberOdr 

func (self *LightChain) GetHeaderByNumberOdr(ctx context.Context, number uint64) (*types.Header, error)

GetHeaderByNumberOdr retrieves a block header from the database or network by number, caching it (associated with its hash) if found.

func (*LightChain) GetTd 

func (self *LightChain) GetTd(hash common.Hash, number uint64) *big.Int

GetTd retrieves a block's total difficulty in the canonical chain from the database by hash and number, caching it if found.

func (*LightChain) GetTdByHash 

func (self *LightChain) GetTdByHash(hash common.Hash) *big.Int

GetTdByHash retrieves a block's total difficulty in the canonical chain from the database by hash, caching it if found.

func (*LightChain) HasBlock 

func (bc *LightChain) HasBlock(hash common.Hash, number uint64) bool

HasBlock checks if a block is fully present in the database or not, caching it if present.

func (*LightChain) HasHeader 

func (bc *LightChain) HasHeader(hash common.Hash, number uint64) bool

HasHeader checks if a block header is present in the database or not, caching it if present.

func (*LightChain) InsertHeaderChain 

func (self *LightChain) InsertHeaderChain(chain []*types.Header, checkFreq int) (int, error)

InsertHeaderChain attempts to insert the given header chain in to the local chain, possibly creating a reorg. If an error is returned, it will return the index number of the failing header as well an error describing what went wrong.

The verify parameter can be used to fine tune whether nonce verification should be done or not. The reason behind the optional check is because some of the header retrieval mechanisms already need to verfy nonces, as well as because nonces can be verified sparsely, not needing to check each.

In the case of a light chain, InsertHeaderChain also creates and posts light chain events when necessary.

func (*LightChain) LockChain 

func (self *LightChain) LockChain()

LockChain locks the chain mutex for reading so that multiple canonical hashes can be retrieved while it is guaranteed that they belong to the same version of the chain

func (*LightChain) Odr 

func (self *LightChain) Odr() OdrBackend

Odr returns the ODR backend of the chain

func (*LightChain) Reset 

func (bc *LightChain) Reset()

Reset purges the entire blockchain, restoring it to its genesis state.

func (*LightChain) ResetWithGenesisBlock 

func (bc *LightChain) ResetWithGenesisBlock(genesis *types.Block)

ResetWithGenesisBlock purges the entire blockchain, restoring it to the specified genesis state.

func (*LightChain) Rollback 

func (self *LightChain) Rollback(chain []common.Hash)

Rollback is designed to remove a chain of links from the database that aren't certain enough to be valid.

func (*LightChain) SetHead 

func (bc *LightChain) SetHead(head uint64)

SetHead rewinds the local chain to a new head. Everything above the new head will be deleted and the new one set.

func (*LightChain) State 

func (bc *LightChain) State() (*state.StateDB, *state.StateDB, error)

State returns a new mutable state based on the current HEAD block.

func (*LightChain) Stop 

func (bc *LightChain) Stop()

Stop stops the blockchain service. If any imports are currently in progress it will abort them using the procInterrupt.

func (*LightChain) SubscribeChainEvent 

func (self *LightChain) SubscribeChainEvent(ch chan<- core.ChainEvent) event.Subscription

SubscribeChainEvent registers a subscription of ChainEvent.

func (*LightChain) SubscribeChainHeadEvent 

func (self *LightChain) SubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent) event.Subscription

SubscribeChainHeadEvent registers a subscription of ChainHeadEvent.

func (*LightChain) SubscribeChainSideEvent 

func (self *LightChain) SubscribeChainSideEvent(ch chan<- core.ChainSideEvent) event.Subscription

SubscribeChainSideEvent registers a subscription of ChainSideEvent.

func (*LightChain) SubscribeLogsEvent 

func (self *LightChain) SubscribeLogsEvent(ch chan<- []*types.Log) event.Subscription

SubscribeLogsEvent implements the interface of filters.Backend LightChain does not send logs events, so return an empty subscription.

func (*LightChain) SubscribeRemovedLogsEvent 

func (self *LightChain) SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent) event.Subscription

SubscribeRemovedLogsEvent implements the interface of filters.Backend LightChain does not send core.RemovedLogsEvent, so return an empty subscription.

func (*LightChain) SyncCht 

func (self *LightChain) SyncCht(ctx context.Context) bool

func (*LightChain) UnlockChain 

func (self *LightChain) UnlockChain()

UnlockChain unlocks the chain mutex

type NodeList 

type NodeList []rlp.RawValue

NodeList stores an ordered list of trie nodes. It implements ethdb.Putter.

func (NodeList) DataSize 

func (n NodeList) DataSize() int

DataSize returns the aggregated data size of nodes in the list

func (NodeList) NodeSet 

func (n NodeList) NodeSet() *NodeSet

NodeSet converts the node list to a NodeSet

func (*NodeList) Put 

func (n *NodeList) Put(key []byte, value []byte) error

Put stores a new node at the end of the list

func (NodeList) Store 

func (n NodeList) Store(db ethdb.Putter)

Store writes the contents of the list to the given database

type NodeSet 

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

NodeSet stores a set of trie nodes. It implements trie.Database and can also act as a cache for another trie.Database.

func NewNodeSet 

func NewNodeSet() *NodeSet

NewNodeSet creates an empty node set

func (*NodeSet) DataSize 

func (db *NodeSet) DataSize() int

DataSize returns the aggregated data size of nodes in the set

func (*NodeSet) Get 

func (db *NodeSet) Get(key []byte) ([]byte, error)

Get returns a stored node

func (*NodeSet) Has 

func (db *NodeSet) Has(key []byte) (bool, error)

Has returns true if the node set contains the given key

func (*NodeSet) KeyCount 

func (db *NodeSet) KeyCount() int

KeyCount returns the number of nodes in the set

func (*NodeSet) NodeList 

func (db *NodeSet) NodeList() NodeList

NodeList converts the node set to a NodeList

func (*NodeSet) Put 

func (db *NodeSet) Put(key []byte, value []byte) error

Put stores a new node in the set

func (*NodeSet) Store 

func (db *NodeSet) Store(target ethdb.Putter)

Store writes the contents of the set to the given database

type OdrBackend 

type OdrBackend interface {
	Database() ethdb.Database
	ChtIndexer() *core.ChainIndexer
	BloomTrieIndexer() *core.ChainIndexer
	BloomIndexer() *core.ChainIndexer
	Retrieve(ctx context.Context, req OdrRequest) error
	IndexerConfig() *IndexerConfig
}

OdrBackend is an interface to a backend service that handles ODR retrievals type

type OdrRequest 

type OdrRequest interface {
	StoreResult(db ethdb.Database)
}

OdrRequest is an interface for retrieval requests

type ReceiptsRequest 

type ReceiptsRequest struct {
	OdrRequest
	Hash     common.Hash
	Number   uint64
	Receipts types.Receipts
}

ReceiptsRequest is the ODR request type for retrieving block bodies

func (*ReceiptsRequest) StoreResult 

func (req *ReceiptsRequest) StoreResult(db ethdb.Database)

StoreResult stores the retrieved data in local database

type TrieID 

type TrieID struct {
	BlockHash, Root common.Hash
	BlockNumber     uint64
	AccKey          []byte
}

TrieID identifies a state or account storage trie

func StateTrieID 

func StateTrieID(header *types.Header) *TrieID

StateTrieID returns a TrieID for a state trie belonging to a certain block header.

func StorageTrieID 

func StorageTrieID(state *TrieID, addrHash, root common.Hash) *TrieID

StorageTrieID returns a TrieID for a contract storage trie at a given account of a given state trie. It also requires the root hash of the trie for checking Merkle proofs.

type TrieRequest 

type TrieRequest struct {
	OdrRequest
	Id    *TrieID
	Key   []byte
	Proof *NodeSet
}

TrieRequest is the ODR request type for state/storage trie entries

func (*TrieRequest) StoreResult 

func (req *TrieRequest) StoreResult(db ethdb.Database)

StoreResult stores the retrieved data in local database

type TxPool 

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

TxPool implements the transaction pool for light clients, which keeps track of the status of locally created transactions, detecting if they are included in a block (mined) or rolled back. There are no queued transactions since we always receive all locally signed transactions in the same order as they are created.

func NewTxPool 

func NewTxPool(config *params.ChainConfig, chain *LightChain, relay TxRelayBackend) *TxPool

NewTxPool creates a new light transaction pool

func (*TxPool) Add 

func (self *TxPool) Add(ctx context.Context, tx *types.Transaction) error

Add adds a transaction to the pool if valid and passes it to the tx relay backend

func (*TxPool) AddBatch 

func (self *TxPool) AddBatch(ctx context.Context, txs []*types.Transaction)

AddTransactions adds all valid transactions to the pool and passes them to the tx relay backend

func (*TxPool) Content 

func (self *TxPool) Content() (map[common.Address]types.Transactions, map[common.Address]types.Transactions)

Content retrieves the data content of the transaction pool, returning all the pending as well as queued transactions, grouped by account and nonce.

func (*TxPool) GetNonce 

func (pool *TxPool) GetNonce(ctx context.Context, addr common.Address) (uint64, error)

GetNonce returns the "pending" nonce of a given address. It always queries the nonce belonging to the latest header too in order to detect if another client using the same key sent a transaction.

func (*TxPool) GetTransaction 

func (tp *TxPool) GetTransaction(hash common.Hash) *types.Transaction

GetTransaction returns a transaction if it is contained in the pool and nil otherwise.

func (*TxPool) GetTransactions 

func (self *TxPool) GetTransactions() (txs types.Transactions, err error)

GetTransactions returns all currently processable transactions. The returned slice may be modified by the caller.

func (*TxPool) RemoveTransactions 

func (self *TxPool) RemoveTransactions(txs types.Transactions)

RemoveTransactions removes all given transactions from the pool.

func (*TxPool) RemoveTx 

func (pool *TxPool) RemoveTx(hash common.Hash)

RemoveTx removes the transaction with the given hash from the pool.

func (*TxPool) Stats 

func (pool *TxPool) Stats() (pending int)

Stats returns the number of currently pending (locally created) transactions

func (*TxPool) Stop 

func (pool *TxPool) Stop()

Stop stops the light transaction pool

func (*TxPool) SubscribeNewTxsEvent 

func (pool *TxPool) SubscribeNewTxsEvent(ch chan<- core.NewTxsEvent) event.Subscription

SubscribeNewTxsEvent registers a subscription of core.NewTxsEvent and starts sending event to the given channel.

type TxRelayBackend 

type TxRelayBackend interface {
	Send(txs types.Transactions)
	NewHead(head common.Hash, mined []common.Hash, rollback []common.Hash)
	Discard(hashes []common.Hash)
}

TxRelayBackend provides an interface to the mechanism that forwards transacions to the ETH network. The implementations of the functions should be non-blocking.

Send instructs backend to forward new transactions NewHead notifies backend about a new head after processed by the tx pool, 

including  mined and rolled back transactions since the last event

Discard notifies backend about transactions that should be discarded either 

because they have been replaced by a re-send or because they have been mined
long ago and no rollback is expected

Source Files

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