mempool

package
v100.1.0 Latest Latest
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 Go to latest Published: Sep 3, 2024 License: Apache-2.0 Imports: 26 Imported by: 0

Documentation

Overview

TODO: Better handle abci client errors. (make it automatically handle connection errors)

Index

Constants

View Source 
const (
	MempoolChannel = byte(0x30)

	// PeerCatchupSleepIntervalMS defines how much time to sleep if a peer is behind.
	PeerCatchupSleepIntervalMS = 100
)
View Source 
const (
	// MetricsSubsystem is a subsystem shared by all metrics exposed by this
	// package.
	MetricsSubsystem = "mempool"
)

Variables

View Source 
var ErrTxInCache = errors.New("tx already exists in cache")

ErrTxInCache is returned to the client if we saw tx earlier.

View Source 
var ErrTxNotFound = errors.New("transaction not found in mempool")

ErrTxNotFound is returned to the client if tx is not found in mempool.

Functions

func IsPreCheckError 

func IsPreCheckError(err error) bool

IsPreCheckError returns true if err is due to pre check failure.

Types

type CListMempool 

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

CListMempool is an ordered in-memory pool for transactions before they are proposed in a consensus round. Transaction validity is checked using the CheckTx abci message before the transaction is added to the pool. The mempool uses a concurrent list structure for storing transactions that can be efficiently accessed by multiple concurrent readers.

func NewCListMempool 

func NewCListMempool(
	cfg *config.MempoolConfig,
	proxyAppConn proxy.AppConnMempool,
	height int64,
	options ...CListMempoolOption,
) *CListMempool

NewCListMempool returns a new mempool with the given configuration and connection to an application.

func (*CListMempool) CheckTx 

func (mem *CListMempool) CheckTx(tx types.Tx, sender p2p.ID) (*abcicli.ReqRes, error)

It blocks if we're waiting on Update() or Reap(). Safe for concurrent use by multiple goroutines.

func (*CListMempool) EnableTxsAvailable 

func (mem *CListMempool) EnableTxsAvailable()

NOTE: not thread safe - should only be called once, on startup.

func (*CListMempool) Flush 

func (mem *CListMempool) Flush()

XXX: Unsafe! Calling Flush may leave mempool in inconsistent state.

func (*CListMempool) FlushAppConn 

func (mem *CListMempool) FlushAppConn() error

Lock() must be help by the caller during execution.

func (*CListMempool) InMempool 

func (mem *CListMempool) InMempool(txKey types.TxKey) bool

func (*CListMempool) Lock 

func (mem *CListMempool) Lock()

Safe for concurrent use by multiple goroutines.

func (*CListMempool) PreUpdate 

func (mem *CListMempool) PreUpdate()

Safe for concurrent use by multiple goroutines.

func (*CListMempool) ReapMaxBytesMaxGas 

func (mem *CListMempool) ReapMaxBytesMaxGas(maxBytes, maxGas int64) types.Txs

Safe for concurrent use by multiple goroutines.

func (*CListMempool) ReapMaxTxs 

func (mem *CListMempool) ReapMaxTxs(max int) types.Txs

Safe for concurrent use by multiple goroutines.

func (*CListMempool) RemoveTxByKey 

func (mem *CListMempool) RemoveTxByKey(txKey types.TxKey) error

RemoveTxByKey removes a transaction from the mempool by its TxKey index. Called from:

  • Update (lock held) if tx was committed
  • handleRecheckTxResponse (lock not held) if tx was invalidated

func (*CListMempool) SetLogger 

func (mem *CListMempool) SetLogger(l log.Logger)

SetLogger sets the Logger.

func (*CListMempool) Size 

func (mem *CListMempool) Size() int

Safe for concurrent use by multiple goroutines.

func (*CListMempool) SizeBytes 

func (mem *CListMempool) SizeBytes() int64

Safe for concurrent use by multiple goroutines.

func (*CListMempool) TxsAvailable 

func (mem *CListMempool) TxsAvailable() <-chan struct{}

Safe for concurrent use by multiple goroutines.

func (*CListMempool) TxsFront 

func (mem *CListMempool) TxsFront() *clist.CElement

TxsFront returns the first transaction in the ordered list for peer goroutines to call .NextWait() on. FIXME: leaking implementation details!

Safe for concurrent use by multiple goroutines.

func (*CListMempool) TxsWaitChan 

func (mem *CListMempool) TxsWaitChan() <-chan struct{}

TxsWaitChan returns a channel to wait on transactions. It will be closed once the mempool is not empty (ie. the internal `mem.txs` has at least one element)

Safe for concurrent use by multiple goroutines.

func (*CListMempool) Unlock 

func (mem *CListMempool) Unlock()

Safe for concurrent use by multiple goroutines.

func (*CListMempool) Update 

func (mem *CListMempool) Update(
	height int64,
	txs types.Txs,
	txResults []*abci.ExecTxResult,
	preCheck PreCheckFunc,
	postCheck PostCheckFunc,
) error

Lock() must be help by the caller during execution. TODO: this function always returns nil; remove the return value.

type CListMempoolOption 

type CListMempoolOption func(*CListMempool)

CListMempoolOption sets an optional parameter on the mempool.

func WithMetrics 

func WithMetrics(metrics *Metrics) CListMempoolOption

WithMetrics sets the metrics.

func WithPostCheck 

func WithPostCheck(f PostCheckFunc) CListMempoolOption

WithPostCheck sets a filter for the mempool to reject a tx if f(tx) returns false. This is ran after CheckTx. Only applies to the first created block. After that, Update overwrites the existing value.

func WithPreCheck 

func WithPreCheck(f PreCheckFunc) CListMempoolOption

WithPreCheck sets a filter for the mempool to reject a tx if f(tx) returns false. This is ran before CheckTx. Only applies to the first created block. After that, Update overwrites the existing value.

type ErrAppConnMempool 

type ErrAppConnMempool struct {
	Err error
}

func (ErrAppConnMempool) Error 

func (e ErrAppConnMempool) Error() string

func (ErrAppConnMempool) Unwrap 

func (e ErrAppConnMempool) Unwrap() error

type ErrFlushAppConn 

type ErrFlushAppConn struct {
	Err error
}

func (ErrFlushAppConn) Error 

func (e ErrFlushAppConn) Error() string

func (ErrFlushAppConn) Unwrap 

func (e ErrFlushAppConn) Unwrap() error

type ErrMempoolIsFull 

type ErrMempoolIsFull struct {
	NumTxs      int
	MaxTxs      int
	TxsBytes    int64
	MaxTxsBytes int64
	RecheckFull bool
}

ErrMempoolIsFull defines an error where CometBFT and the application cannot handle that much load.

func (ErrMempoolIsFull) Error 

func (e ErrMempoolIsFull) Error() string

type ErrPreCheck 

type ErrPreCheck struct {
	Err error
}

ErrPreCheck defines an error where a transaction fails a pre-check.

func (ErrPreCheck) Error 

func (e ErrPreCheck) Error() string

func (ErrPreCheck) Unwrap 

func (e ErrPreCheck) Unwrap() error

type ErrTxTooLarge 

type ErrTxTooLarge struct {
	Max    int
	Actual int
}

ErrTxTooLarge defines an error when a transaction is too big to be sent in a message to other peers.

func (ErrTxTooLarge) Error 

func (e ErrTxTooLarge) Error() string

type LRUTxCache 

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

LRUTxCache maintains a thread-safe LRU cache of raw transactions. The cache only stores the hash of the raw transaction.

func NewLRUTxCache 

func NewLRUTxCache(cacheSize int) *LRUTxCache

func (*LRUTxCache) GetList 

func (c *LRUTxCache) GetList() *list.List

GetList returns the underlying linked-list that backs the LRU cache. Note, this should be used for testing purposes only!

func (*LRUTxCache) Has 

func (c *LRUTxCache) Has(tx types.Tx) bool

func (*LRUTxCache) Push 

func (c *LRUTxCache) Push(tx types.Tx) bool

func (*LRUTxCache) Remove 

func (c *LRUTxCache) Remove(tx types.Tx)

func (*LRUTxCache) Reset 

func (c *LRUTxCache) Reset()

Reset resets the cache to an empty state.

type Mempool 

type Mempool interface {
	// CheckTx executes a new transaction against the application to determine
	// its validity and whether it should be added to the mempool.
	CheckTx(tx types.Tx, sender p2p.ID) (*abcicli.ReqRes, error)

	// RemoveTxByKey removes a transaction, identified by its key,
	// from the mempool.
	RemoveTxByKey(txKey types.TxKey) error

	// ReapMaxBytesMaxGas reaps transactions from the mempool up to maxBytes
	// bytes total with the condition that the total gasWanted must be less than
	// maxGas.
	//
	// If both maxes are negative, there is no cap on the size of all returned
	// transactions (~ all available transactions).
	ReapMaxBytesMaxGas(maxBytes, maxGas int64) types.Txs

	// ReapMaxTxs reaps up to max transactions from the mempool. If max is
	// negative, there is no cap on the size of all returned transactions
	// (~ all available transactions).
	ReapMaxTxs(max int) types.Txs

	// Lock locks the mempool. The consensus must be able to hold lock to safely
	// update.
	Lock()

	// Unlock unlocks the mempool.
	Unlock()

	// PreUpdate signals that a new update is coming, before acquiring the mempool lock.
	// If the mempool is still rechecking at this point, it should be considered full.
	PreUpdate()

	// Update informs the mempool that the given txs were committed and can be
	// discarded.
	//
	// NOTE:
	// 1. This should be called *after* block is committed by consensus.
	// 2. Lock/Unlock must be managed by the caller.
	Update(
		blockHeight int64,
		blockTxs types.Txs,
		deliverTxResponses []*abci.ExecTxResult,
		newPreFn PreCheckFunc,
		newPostFn PostCheckFunc,
	) error

	// FlushAppConn flushes the mempool connection to ensure async callback calls
	// are done, e.g. from CheckTx.
	//
	// NOTE:
	// 1. Lock/Unlock must be managed by caller.
	FlushAppConn() error

	// Flush removes all transactions from the mempool and caches.
	Flush()

	// TxsAvailable returns a channel which fires once for every height, and only
	// when transactions are available in the mempool.
	//
	// NOTE:
	// 1. The returned channel may be nil if EnableTxsAvailable was not called.
	TxsAvailable() <-chan struct{}

	// EnableTxsAvailable initializes the TxsAvailable channel, ensuring it will
	// trigger once every height when transactions are available.
	EnableTxsAvailable()

	// Size returns the number of transactions in the mempool.
	Size() int

	// SizeBytes returns the total size of all txs in the mempool.
	SizeBytes() int64
}

Mempool defines the mempool interface.

Updates to the mempool need to be synchronized with committing a block so applications can reset their transient state on Commit.

type Metrics 

type Metrics struct {
	// Number of uncommitted transactions in the mempool.
	Size metrics.Gauge

	// Total size of the mempool in bytes.
	SizeBytes metrics.Gauge

	// Histogram of transaction sizes in bytes.
	TxSizeBytes metrics.Histogram `metrics_bucketsizes:"1,3,7" metrics_buckettype:"exp"`

	// Number of failed transactions.
	FailedTxs metrics.Counter

	// RejectedTxs defines the number of rejected transactions. These are
	// transactions that passed CheckTx but failed to make it into the mempool
	// due to resource limits, e.g. mempool is full and no lower priority
	// transactions exist in the mempool.
	// metrics:Number of rejected transactions.
	RejectedTxs metrics.Counter

	// Number of times transactions are rechecked in the mempool.
	RecheckTimes metrics.Counter

	// Number of times transactions were received more than once.
	// metrics:Number of duplicate transaction reception.
	AlreadyReceivedTxs metrics.Counter

	// Number of connections being actively used for gossiping transactions
	// (experimental feature).
	ActiveOutboundConnections metrics.Gauge
}

Metrics contains metrics exposed by this package. see MetricsProvider for descriptions.

func NopMetrics 

func NopMetrics() *Metrics

func PrometheusMetrics 

func PrometheusMetrics(namespace string, labelsAndValues ...string) *Metrics

type NopMempool 

type NopMempool struct{}

NopMempool is a mempool that does nothing.

The ABCI app is responsible for storing, disseminating, and proposing transactions. See [ADR-111](../docs/architecture/adr-111-nop-mempool.md).

func (*NopMempool) CheckTx 

func (*NopMempool) CheckTx(types.Tx, p2p.ID) (*abcicli.ReqRes, error)

CheckTx always returns an error.

func (*NopMempool) EnableTxsAvailable 

func (*NopMempool) EnableTxsAvailable()

EnableTxsAvailable does nothing.

func (*NopMempool) Flush 

func (*NopMempool) Flush()

Flush does nothing.

func (*NopMempool) FlushAppConn 

func (*NopMempool) FlushAppConn() error

FlushAppConn does nothing.

func (*NopMempool) Lock 

func (*NopMempool) Lock()

Lock does nothing.

func (*NopMempool) PreUpdate 

func (*NopMempool) PreUpdate()

func (*NopMempool) ReapMaxBytesMaxGas 

func (*NopMempool) ReapMaxBytesMaxGas(int64, int64) types.Txs

ReapMaxBytesMaxGas always returns nil.

func (*NopMempool) ReapMaxTxs 

func (*NopMempool) ReapMaxTxs(int) types.Txs

ReapMaxTxs always returns nil.

func (*NopMempool) RemoveTxByKey 

func (*NopMempool) RemoveTxByKey(types.TxKey) error

RemoveTxByKey always returns an error.

func (*NopMempool) Size 

func (*NopMempool) Size() int

Size always returns 0.

func (*NopMempool) SizeBytes 

func (*NopMempool) SizeBytes() int64

SizeBytes always returns 0.

func (*NopMempool) TxsAvailable 

func (*NopMempool) TxsAvailable() <-chan struct{}

TxsAvailable always returns nil.

func (*NopMempool) Unlock 

func (*NopMempool) Unlock()

Unlock does nothing.

func (*NopMempool) Update 

func (*NopMempool) Update(
	int64,
	types.Txs,
	[]*abci.ExecTxResult,
	PreCheckFunc,
	PostCheckFunc,
) error

Update does nothing.

type NopMempoolReactor 

type NopMempoolReactor struct {
	service.BaseService
}

NopMempoolReactor is a mempool reactor that does nothing.

func NewNopMempoolReactor 

func NewNopMempoolReactor() *NopMempoolReactor

NewNopMempoolReactor returns a new `nop` reactor.

To be used only in RPC.

func (*NopMempoolReactor) AddPeer 

func (*NopMempoolReactor) AddPeer(p2p.Peer)

AddPeer does nothing.

func (*NopMempoolReactor) GetChannels 

func (*NopMempoolReactor) GetChannels() []*p2p.ChannelDescriptor

GetChannels always returns nil.

func (*NopMempoolReactor) InitPeer 

func (*NopMempoolReactor) InitPeer(p2p.Peer) p2p.Peer

InitPeer always returns nil.

func (*NopMempoolReactor) Receive 

func (*NopMempoolReactor) Receive(p2p.Envelope)

Receive does nothing.

func (*NopMempoolReactor) RemovePeer 

func (*NopMempoolReactor) RemovePeer(p2p.Peer, any)

RemovePeer does nothing.

func (*NopMempoolReactor) SetSwitch 

func (*NopMempoolReactor) SetSwitch(*p2p.Switch)

SetSwitch does nothing.

func (*NopMempoolReactor) WaitSync 

func (*NopMempoolReactor) WaitSync() bool

WaitSync always returns false.

type NopTxCache 

type NopTxCache struct{}

NopTxCache defines a no-op raw transaction cache.

func (NopTxCache) Has 

func (NopTxCache) Has(types.Tx) bool

func (NopTxCache) Push 

func (NopTxCache) Push(types.Tx) bool

func (NopTxCache) Remove 

func (NopTxCache) Remove(types.Tx)

func (NopTxCache) Reset 

func (NopTxCache) Reset()

type PeerState 

type PeerState interface {
	GetHeight() int64
}

PeerState describes the state of a peer.

type PostCheckFunc 

type PostCheckFunc func(types.Tx, *abci.CheckTxResponse) error

PostCheckFunc is an optional filter executed after CheckTx and rejects transaction if false is returned. An example would be to ensure a transaction doesn't require more gas than available for the block.

func PostCheckMaxGas 

func PostCheckMaxGas(maxGas int64) PostCheckFunc

PostCheckMaxGas checks that the wanted gas is smaller or equal to the passed maxGas. Returns nil if maxGas is -1.

type PreCheckFunc 

type PreCheckFunc func(types.Tx) error

PreCheckFunc is an optional filter executed before CheckTx and rejects transaction if false is returned. An example would be to ensure that a transaction doesn't exceeded the block size.

func PreCheckMaxBytes 

func PreCheckMaxBytes(maxBytes int64) PreCheckFunc

PreCheckMaxBytes checks that the size of the transaction is smaller or equal to the expected maxBytes.

type Reactor 

type Reactor struct {
	p2p.BaseReactor
	// contains filtered or unexported fields
}

Reactor handles mempool tx broadcasting amongst peers. It maintains a map from peer ID to counter, to prevent gossiping txs to the peers you received it from.

func NewReactor 

func NewReactor(config *cfg.MempoolConfig, mempool *CListMempool, waitSync bool) *Reactor

NewReactor returns a new Reactor with the given config and mempool.

func (*Reactor) AddPeer 

func (memR *Reactor) AddPeer(peer p2p.Peer)

AddPeer implements Reactor. It starts a broadcast routine ensuring all txs are forwarded to the given peer.

func (*Reactor) EnableInOutTxs 

func (memR *Reactor) EnableInOutTxs()

func (*Reactor) GetChannels 

func (memR *Reactor) GetChannels() []*p2p.ChannelDescriptor

GetChannels implements Reactor by returning the list of channels for this reactor.

func (*Reactor) OnStart 

func (memR *Reactor) OnStart() error

OnStart implements p2p.BaseReactor.

func (*Reactor) Receive 

func (memR *Reactor) Receive(e p2p.Envelope)

Receive implements Reactor. It adds any received transactions to the mempool.

func (*Reactor) SetLogger 

func (memR *Reactor) SetLogger(l log.Logger)

SetLogger sets the Logger on the reactor and the underlying mempool.

func (*Reactor) WaitSync 

func (memR *Reactor) WaitSync() bool

type TxCache 

type TxCache interface {
	// Reset resets the cache to an empty state.
	Reset()

	// Push adds the given raw transaction to the cache and returns true if it was
	// newly added. Otherwise, it returns false.
	Push(tx types.Tx) bool

	// Remove removes the given raw transaction from the cache.
	Remove(tx types.Tx)

	// Has reports whether tx is present in the cache. Checking for presence is
	// not treated as an access of the value.
	Has(tx types.Tx) bool
}

TxCache defines an interface for raw transaction caching in a mempool. Currently, a TxCache does not allow direct reading or getting of transaction values. A TxCache is used primarily to push transactions and removing transactions. Pushing via Push returns a boolean telling the caller if the transaction already exists in the cache or not.

type TxKey 

type TxKey [sha256.Size]byte

TxKey is the fixed length array key used as an index.

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