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717 lines
20 KiB
717 lines
20 KiB
package mempool
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import (
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"bytes"
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"container/list"
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"crypto/sha256"
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"fmt"
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"sync"
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"sync/atomic"
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"time"
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"github.com/pkg/errors"
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abci "github.com/tendermint/tendermint/abci/types"
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cfg "github.com/tendermint/tendermint/config"
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auto "github.com/tendermint/tendermint/libs/autofile"
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"github.com/tendermint/tendermint/libs/clist"
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cmn "github.com/tendermint/tendermint/libs/common"
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"github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/proxy"
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"github.com/tendermint/tendermint/types"
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)
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//--------------------------------------------------------------------------------
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// CListMempool is an ordered in-memory pool for transactions before they are
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// proposed in a consensus round. Transaction validity is checked using the
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// CheckTx abci message before the transaction is added to the pool. The
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// mempool uses a concurrent list structure for storing transactions that can
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// be efficiently accessed by multiple concurrent readers.
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type CListMempool struct {
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config *cfg.MempoolConfig
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proxyMtx sync.Mutex
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proxyAppConn proxy.AppConnMempool
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txs *clist.CList // concurrent linked-list of good txs
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preCheck PreCheckFunc
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postCheck PostCheckFunc
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// Track whether we're rechecking txs.
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// These are not protected by a mutex and are expected to be mutated
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// in serial (ie. by abci responses which are called in serial).
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recheckCursor *clist.CElement // next expected response
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recheckEnd *clist.CElement // re-checking stops here
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// notify listeners (ie. consensus) when txs are available
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notifiedTxsAvailable bool
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txsAvailable chan struct{} // fires once for each height, when the mempool is not empty
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// Map for quick access to txs to record sender in CheckTx.
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// txsMap: txKey -> CElement
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txsMap sync.Map
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// Atomic integers
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height int64 // the last block Update()'d to
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rechecking int32 // for re-checking filtered txs on Update()
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txsBytes int64 // total size of mempool, in bytes
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// Keep a cache of already-seen txs.
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// This reduces the pressure on the proxyApp.
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cache txCache
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// A log of mempool txs
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wal *auto.AutoFile
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logger log.Logger
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metrics *Metrics
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}
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var _ Mempool = &CListMempool{}
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// Option sets an optional parameter on the mempool.
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type Option func(*CListMempool)
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// NewCListMempool returns a new mempool with the given configuration and connection to an application.
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func NewCListMempool(
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config *cfg.MempoolConfig,
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proxyAppConn proxy.AppConnMempool,
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height int64,
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options ...Option,
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) *CListMempool {
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mempool := &CListMempool{
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config: config,
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proxyAppConn: proxyAppConn,
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txs: clist.New(),
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height: height,
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rechecking: 0,
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recheckCursor: nil,
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recheckEnd: nil,
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logger: log.NewNopLogger(),
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metrics: NopMetrics(),
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}
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if config.CacheSize > 0 {
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mempool.cache = newMapTxCache(config.CacheSize)
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} else {
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mempool.cache = nopTxCache{}
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}
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proxyAppConn.SetResponseCallback(mempool.globalCb)
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for _, option := range options {
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option(mempool)
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}
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return mempool
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}
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// NOTE: not thread safe - should only be called once, on startup
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func (mem *CListMempool) EnableTxsAvailable() {
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mem.txsAvailable = make(chan struct{}, 1)
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}
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// SetLogger sets the Logger.
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func (mem *CListMempool) SetLogger(l log.Logger) {
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mem.logger = l
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}
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// WithPreCheck sets a filter for the mempool to reject a tx if f(tx) returns
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// false. This is ran before CheckTx.
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func WithPreCheck(f PreCheckFunc) Option {
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return func(mem *CListMempool) { mem.preCheck = f }
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}
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// WithPostCheck sets a filter for the mempool to reject a tx if f(tx) returns
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// false. This is ran after CheckTx.
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func WithPostCheck(f PostCheckFunc) Option {
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return func(mem *CListMempool) { mem.postCheck = f }
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}
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// WithMetrics sets the metrics.
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func WithMetrics(metrics *Metrics) Option {
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return func(mem *CListMempool) { mem.metrics = metrics }
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}
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// InitWAL creates a directory for the WAL file and opens a file itself.
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//
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// *panics* if can't create directory or open file.
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// *not thread safe*
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func (mem *CListMempool) InitWAL() {
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walDir := mem.config.WalDir()
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err := cmn.EnsureDir(walDir, 0700)
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if err != nil {
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panic(errors.Wrap(err, "Error ensuring WAL dir"))
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}
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af, err := auto.OpenAutoFile(walDir + "/wal")
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if err != nil {
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panic(errors.Wrap(err, "Error opening WAL file"))
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}
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mem.wal = af
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}
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// CloseWAL closes and discards the underlying WAL file.
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// Any further writes will not be relayed to disk.
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func (mem *CListMempool) CloseWAL() {
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mem.proxyMtx.Lock()
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defer mem.proxyMtx.Unlock()
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if err := mem.wal.Close(); err != nil {
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mem.logger.Error("Error closing WAL", "err", err)
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}
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mem.wal = nil
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}
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func (mem *CListMempool) Lock() {
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mem.proxyMtx.Lock()
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}
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func (mem *CListMempool) Unlock() {
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mem.proxyMtx.Unlock()
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}
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func (mem *CListMempool) Size() int {
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return mem.txs.Len()
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}
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func (mem *CListMempool) TxsBytes() int64 {
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return atomic.LoadInt64(&mem.txsBytes)
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}
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func (mem *CListMempool) FlushAppConn() error {
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return mem.proxyAppConn.FlushSync()
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}
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func (mem *CListMempool) Flush() {
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mem.proxyMtx.Lock()
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defer mem.proxyMtx.Unlock()
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mem.cache.Reset()
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for e := mem.txs.Front(); e != nil; e = e.Next() {
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mem.txs.Remove(e)
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e.DetachPrev()
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}
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mem.txsMap = sync.Map{}
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_ = atomic.SwapInt64(&mem.txsBytes, 0)
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}
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// TxsFront returns the first transaction in the ordered list for peer
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// goroutines to call .NextWait() on.
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func (mem *CListMempool) TxsFront() *clist.CElement {
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return mem.txs.Front()
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}
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// TxsWaitChan returns a channel to wait on transactions. It will be closed
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// once the mempool is not empty (ie. the internal `mem.txs` has at least one
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// element)
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func (mem *CListMempool) TxsWaitChan() <-chan struct{} {
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return mem.txs.WaitChan()
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}
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// It blocks if we're waiting on Update() or Reap().
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// cb: A callback from the CheckTx command.
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// It gets called from another goroutine.
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// CONTRACT: Either cb will get called, or err returned.
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func (mem *CListMempool) CheckTx(tx types.Tx, cb func(*abci.Response)) (err error) {
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return mem.CheckTxWithInfo(tx, cb, TxInfo{SenderID: UnknownPeerID})
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}
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func (mem *CListMempool) CheckTxWithInfo(tx types.Tx, cb func(*abci.Response), txInfo TxInfo) (err error) {
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mem.proxyMtx.Lock()
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// use defer to unlock mutex because application (*local client*) might panic
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defer mem.proxyMtx.Unlock()
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var (
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memSize = mem.Size()
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txsBytes = mem.TxsBytes()
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)
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if memSize >= mem.config.Size ||
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int64(len(tx))+txsBytes > mem.config.MaxTxsBytes {
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return ErrMempoolIsFull{
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memSize, mem.config.Size,
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txsBytes, mem.config.MaxTxsBytes}
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}
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// The size of the corresponding amino-encoded TxMessage
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// can't be larger than the maxMsgSize, otherwise we can't
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// relay it to peers.
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if len(tx) > maxTxSize {
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return ErrTxTooLarge
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}
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if mem.preCheck != nil {
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if err := mem.preCheck(tx); err != nil {
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return ErrPreCheck{err}
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}
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}
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// CACHE
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if !mem.cache.Push(tx) {
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// Record a new sender for a tx we've already seen.
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// Note it's possible a tx is still in the cache but no longer in the mempool
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// (eg. after committing a block, txs are removed from mempool but not cache),
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// so we only record the sender for txs still in the mempool.
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if e, ok := mem.txsMap.Load(txKey(tx)); ok {
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memTx := e.(*clist.CElement).Value.(*mempoolTx)
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if _, loaded := memTx.senders.LoadOrStore(txInfo.SenderID, true); loaded {
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// TODO: consider punishing peer for dups,
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// its non-trivial since invalid txs can become valid,
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// but they can spam the same tx with little cost to them atm.
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}
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}
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return ErrTxInCache
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}
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// END CACHE
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// WAL
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if mem.wal != nil {
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// TODO: Notify administrators when WAL fails
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_, err := mem.wal.Write([]byte(tx))
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if err != nil {
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mem.logger.Error("Error writing to WAL", "err", err)
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}
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_, err = mem.wal.Write([]byte("\n"))
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if err != nil {
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mem.logger.Error("Error writing to WAL", "err", err)
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}
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}
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// END WAL
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// NOTE: proxyAppConn may error if tx buffer is full
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if err = mem.proxyAppConn.Error(); err != nil {
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return err
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}
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reqRes := mem.proxyAppConn.CheckTxAsync(tx)
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reqRes.SetCallback(mem.reqResCb(tx, txInfo.SenderID, cb))
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return nil
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}
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// Global callback that will be called after every ABCI response.
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// Having a single global callback avoids needing to set a callback for each request.
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// However, processing the checkTx response requires the peerID (so we can track which txs we heard from who),
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// and peerID is not included in the ABCI request, so we have to set request-specific callbacks that
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// include this information. If we're not in the midst of a recheck, this function will just return,
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// so the request specific callback can do the work.
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// When rechecking, we don't need the peerID, so the recheck callback happens here.
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func (mem *CListMempool) globalCb(req *abci.Request, res *abci.Response) {
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if mem.recheckCursor == nil {
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return
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}
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mem.metrics.RecheckTimes.Add(1)
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mem.resCbRecheck(req, res)
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// update metrics
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mem.metrics.Size.Set(float64(mem.Size()))
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}
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// Request specific callback that should be set on individual reqRes objects
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// to incorporate local information when processing the response.
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// This allows us to track the peer that sent us this tx, so we can avoid sending it back to them.
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// NOTE: alternatively, we could include this information in the ABCI request itself.
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//
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// External callers of CheckTx, like the RPC, can also pass an externalCb through here that is called
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// when all other response processing is complete.
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//
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// Used in CheckTxWithInfo to record PeerID who sent us the tx.
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func (mem *CListMempool) reqResCb(tx []byte, peerID uint16, externalCb func(*abci.Response)) func(res *abci.Response) {
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return func(res *abci.Response) {
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if mem.recheckCursor != nil {
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// this should never happen
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panic("recheck cursor is not nil in reqResCb")
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}
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mem.resCbFirstTime(tx, peerID, res)
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// update metrics
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mem.metrics.Size.Set(float64(mem.Size()))
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// passed in by the caller of CheckTx, eg. the RPC
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if externalCb != nil {
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externalCb(res)
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}
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}
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}
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// Called from:
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// - resCbFirstTime (lock not held) if tx is valid
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func (mem *CListMempool) addTx(memTx *mempoolTx) {
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e := mem.txs.PushBack(memTx)
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mem.txsMap.Store(txKey(memTx.tx), e)
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atomic.AddInt64(&mem.txsBytes, int64(len(memTx.tx)))
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mem.metrics.TxSizeBytes.Observe(float64(len(memTx.tx)))
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}
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// Called from:
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// - Update (lock held) if tx was committed
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// - resCbRecheck (lock not held) if tx was invalidated
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func (mem *CListMempool) removeTx(tx types.Tx, elem *clist.CElement, removeFromCache bool) {
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mem.txs.Remove(elem)
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elem.DetachPrev()
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mem.txsMap.Delete(txKey(tx))
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atomic.AddInt64(&mem.txsBytes, int64(-len(tx)))
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if removeFromCache {
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mem.cache.Remove(tx)
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}
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}
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// callback, which is called after the app checked the tx for the first time.
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//
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// The case where the app checks the tx for the second and subsequent times is
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// handled by the resCbRecheck callback.
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func (mem *CListMempool) resCbFirstTime(tx []byte, peerID uint16, res *abci.Response) {
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switch r := res.Value.(type) {
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case *abci.Response_CheckTx:
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var postCheckErr error
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if mem.postCheck != nil {
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postCheckErr = mem.postCheck(tx, r.CheckTx)
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}
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if (r.CheckTx.Code == abci.CodeTypeOK) && postCheckErr == nil {
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memTx := &mempoolTx{
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height: mem.height,
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gasWanted: r.CheckTx.GasWanted,
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tx: tx,
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}
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memTx.senders.Store(peerID, true)
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mem.addTx(memTx)
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mem.logger.Info("Added good transaction",
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"tx", txID(tx),
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"res", r,
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"height", memTx.height,
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"total", mem.Size(),
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)
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mem.notifyTxsAvailable()
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} else {
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// ignore bad transaction
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mem.logger.Info("Rejected bad transaction", "tx", txID(tx), "res", r, "err", postCheckErr)
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mem.metrics.FailedTxs.Add(1)
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// remove from cache (it might be good later)
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mem.cache.Remove(tx)
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}
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default:
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// ignore other messages
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}
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}
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// callback, which is called after the app rechecked the tx.
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//
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// The case where the app checks the tx for the first time is handled by the
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// resCbFirstTime callback.
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func (mem *CListMempool) resCbRecheck(req *abci.Request, res *abci.Response) {
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switch r := res.Value.(type) {
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case *abci.Response_CheckTx:
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tx := req.GetCheckTx().Tx
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memTx := mem.recheckCursor.Value.(*mempoolTx)
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if !bytes.Equal(tx, memTx.tx) {
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panic(fmt.Sprintf(
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"Unexpected tx response from proxy during recheck\nExpected %X, got %X",
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memTx.tx,
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tx))
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}
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var postCheckErr error
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if mem.postCheck != nil {
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postCheckErr = mem.postCheck(tx, r.CheckTx)
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}
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if (r.CheckTx.Code == abci.CodeTypeOK) && postCheckErr == nil {
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// Good, nothing to do.
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} else {
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// Tx became invalidated due to newly committed block.
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mem.logger.Info("Tx is no longer valid", "tx", txID(tx), "res", r, "err", postCheckErr)
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// NOTE: we remove tx from the cache because it might be good later
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mem.removeTx(tx, mem.recheckCursor, true)
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}
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if mem.recheckCursor == mem.recheckEnd {
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mem.recheckCursor = nil
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} else {
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mem.recheckCursor = mem.recheckCursor.Next()
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}
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if mem.recheckCursor == nil {
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// Done!
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atomic.StoreInt32(&mem.rechecking, 0)
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mem.logger.Info("Done rechecking txs")
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// incase the recheck removed all txs
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if mem.Size() > 0 {
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mem.notifyTxsAvailable()
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}
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}
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default:
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// ignore other messages
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}
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}
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func (mem *CListMempool) TxsAvailable() <-chan struct{} {
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return mem.txsAvailable
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}
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func (mem *CListMempool) notifyTxsAvailable() {
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if mem.Size() == 0 {
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panic("notified txs available but mempool is empty!")
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}
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if mem.txsAvailable != nil && !mem.notifiedTxsAvailable {
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// channel cap is 1, so this will send once
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mem.notifiedTxsAvailable = true
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select {
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case mem.txsAvailable <- struct{}{}:
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default:
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}
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}
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}
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func (mem *CListMempool) ReapMaxBytesMaxGas(maxBytes, maxGas int64) types.Txs {
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mem.proxyMtx.Lock()
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defer mem.proxyMtx.Unlock()
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for atomic.LoadInt32(&mem.rechecking) > 0 {
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// TODO: Something better?
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time.Sleep(time.Millisecond * 10)
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}
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var totalBytes int64
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var totalGas int64
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// TODO: we will get a performance boost if we have a good estimate of avg
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// size per tx, and set the initial capacity based off of that.
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// txs := make([]types.Tx, 0, cmn.MinInt(mem.txs.Len(), max/mem.avgTxSize))
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txs := make([]types.Tx, 0, mem.txs.Len())
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for e := mem.txs.Front(); e != nil; e = e.Next() {
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memTx := e.Value.(*mempoolTx)
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// Check total size requirement
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aminoOverhead := types.ComputeAminoOverhead(memTx.tx, 1)
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if maxBytes > -1 && totalBytes+int64(len(memTx.tx))+aminoOverhead > maxBytes {
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return txs
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}
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totalBytes += int64(len(memTx.tx)) + aminoOverhead
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// Check total gas requirement.
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// If maxGas is negative, skip this check.
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// Since newTotalGas < masGas, which
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// must be non-negative, it follows that this won't overflow.
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newTotalGas := totalGas + memTx.gasWanted
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if maxGas > -1 && newTotalGas > maxGas {
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return txs
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}
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totalGas = newTotalGas
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txs = append(txs, memTx.tx)
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}
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return txs
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}
|
|
|
|
func (mem *CListMempool) ReapMaxTxs(max int) types.Txs {
|
|
mem.proxyMtx.Lock()
|
|
defer mem.proxyMtx.Unlock()
|
|
|
|
if max < 0 {
|
|
max = mem.txs.Len()
|
|
}
|
|
|
|
for atomic.LoadInt32(&mem.rechecking) > 0 {
|
|
// TODO: Something better?
|
|
time.Sleep(time.Millisecond * 10)
|
|
}
|
|
|
|
txs := make([]types.Tx, 0, cmn.MinInt(mem.txs.Len(), max))
|
|
for e := mem.txs.Front(); e != nil && len(txs) <= max; e = e.Next() {
|
|
memTx := e.Value.(*mempoolTx)
|
|
txs = append(txs, memTx.tx)
|
|
}
|
|
return txs
|
|
}
|
|
|
|
func (mem *CListMempool) Update(
|
|
height int64,
|
|
txs types.Txs,
|
|
preCheck PreCheckFunc,
|
|
postCheck PostCheckFunc,
|
|
) error {
|
|
// Set height
|
|
mem.height = height
|
|
mem.notifiedTxsAvailable = false
|
|
|
|
if preCheck != nil {
|
|
mem.preCheck = preCheck
|
|
}
|
|
if postCheck != nil {
|
|
mem.postCheck = postCheck
|
|
}
|
|
|
|
// Add committed transactions to cache (if missing).
|
|
for _, tx := range txs {
|
|
_ = mem.cache.Push(tx)
|
|
}
|
|
|
|
// Remove committed transactions.
|
|
txsLeft := mem.removeTxs(txs)
|
|
|
|
// Either recheck non-committed txs to see if they became invalid
|
|
// or just notify there're some txs left.
|
|
if len(txsLeft) > 0 {
|
|
if mem.config.Recheck {
|
|
mem.logger.Info("Recheck txs", "numtxs", len(txsLeft), "height", height)
|
|
mem.recheckTxs(txsLeft)
|
|
// At this point, mem.txs are being rechecked.
|
|
// mem.recheckCursor re-scans mem.txs and possibly removes some txs.
|
|
// Before mem.Reap(), we should wait for mem.recheckCursor to be nil.
|
|
} else {
|
|
mem.notifyTxsAvailable()
|
|
}
|
|
}
|
|
|
|
// Update metrics
|
|
mem.metrics.Size.Set(float64(mem.Size()))
|
|
|
|
return nil
|
|
}
|
|
|
|
func (mem *CListMempool) removeTxs(txs types.Txs) []types.Tx {
|
|
// Build a map for faster lookups.
|
|
txsMap := make(map[string]struct{}, len(txs))
|
|
for _, tx := range txs {
|
|
txsMap[string(tx)] = struct{}{}
|
|
}
|
|
|
|
txsLeft := make([]types.Tx, 0, mem.txs.Len())
|
|
for e := mem.txs.Front(); e != nil; e = e.Next() {
|
|
memTx := e.Value.(*mempoolTx)
|
|
// Remove the tx if it's already in a block.
|
|
if _, ok := txsMap[string(memTx.tx)]; ok {
|
|
// NOTE: we don't remove committed txs from the cache.
|
|
mem.removeTx(memTx.tx, e, false)
|
|
|
|
continue
|
|
}
|
|
txsLeft = append(txsLeft, memTx.tx)
|
|
}
|
|
return txsLeft
|
|
}
|
|
|
|
// NOTE: pass in txs because mem.txs can mutate concurrently.
|
|
func (mem *CListMempool) recheckTxs(txs []types.Tx) {
|
|
if len(txs) == 0 {
|
|
return
|
|
}
|
|
atomic.StoreInt32(&mem.rechecking, 1)
|
|
mem.recheckCursor = mem.txs.Front()
|
|
mem.recheckEnd = mem.txs.Back()
|
|
|
|
// Push txs to proxyAppConn
|
|
// NOTE: globalCb may be called concurrently.
|
|
for _, tx := range txs {
|
|
mem.proxyAppConn.CheckTxAsync(tx)
|
|
}
|
|
mem.proxyAppConn.FlushAsync()
|
|
}
|
|
|
|
//--------------------------------------------------------------------------------
|
|
|
|
// mempoolTx is a transaction that successfully ran
|
|
type mempoolTx struct {
|
|
height int64 // height that this tx had been validated in
|
|
gasWanted int64 // amount of gas this tx states it will require
|
|
tx types.Tx //
|
|
|
|
// ids of peers who've sent us this tx (as a map for quick lookups).
|
|
// senders: PeerID -> bool
|
|
senders sync.Map
|
|
}
|
|
|
|
// Height returns the height for this transaction
|
|
func (memTx *mempoolTx) Height() int64 {
|
|
return atomic.LoadInt64(&memTx.height)
|
|
}
|
|
|
|
//--------------------------------------------------------------------------------
|
|
|
|
type txCache interface {
|
|
Reset()
|
|
Push(tx types.Tx) bool
|
|
Remove(tx types.Tx)
|
|
}
|
|
|
|
// mapTxCache maintains a LRU cache of transactions. This only stores the hash
|
|
// of the tx, due to memory concerns.
|
|
type mapTxCache struct {
|
|
mtx sync.Mutex
|
|
size int
|
|
map_ map[[sha256.Size]byte]*list.Element
|
|
list *list.List
|
|
}
|
|
|
|
var _ txCache = (*mapTxCache)(nil)
|
|
|
|
// newMapTxCache returns a new mapTxCache.
|
|
func newMapTxCache(cacheSize int) *mapTxCache {
|
|
return &mapTxCache{
|
|
size: cacheSize,
|
|
map_: make(map[[sha256.Size]byte]*list.Element, cacheSize),
|
|
list: list.New(),
|
|
}
|
|
}
|
|
|
|
// Reset resets the cache to an empty state.
|
|
func (cache *mapTxCache) Reset() {
|
|
cache.mtx.Lock()
|
|
cache.map_ = make(map[[sha256.Size]byte]*list.Element, cache.size)
|
|
cache.list.Init()
|
|
cache.mtx.Unlock()
|
|
}
|
|
|
|
// Push adds the given tx to the cache and returns true. It returns
|
|
// false if tx is already in the cache.
|
|
func (cache *mapTxCache) Push(tx types.Tx) bool {
|
|
cache.mtx.Lock()
|
|
defer cache.mtx.Unlock()
|
|
|
|
// Use the tx hash in the cache
|
|
txHash := txKey(tx)
|
|
if moved, exists := cache.map_[txHash]; exists {
|
|
cache.list.MoveToBack(moved)
|
|
return false
|
|
}
|
|
|
|
if cache.list.Len() >= cache.size {
|
|
popped := cache.list.Front()
|
|
poppedTxHash := popped.Value.([sha256.Size]byte)
|
|
delete(cache.map_, poppedTxHash)
|
|
if popped != nil {
|
|
cache.list.Remove(popped)
|
|
}
|
|
}
|
|
e := cache.list.PushBack(txHash)
|
|
cache.map_[txHash] = e
|
|
return true
|
|
}
|
|
|
|
// Remove removes the given tx from the cache.
|
|
func (cache *mapTxCache) Remove(tx types.Tx) {
|
|
cache.mtx.Lock()
|
|
txHash := txKey(tx)
|
|
popped := cache.map_[txHash]
|
|
delete(cache.map_, txHash)
|
|
if popped != nil {
|
|
cache.list.Remove(popped)
|
|
}
|
|
|
|
cache.mtx.Unlock()
|
|
}
|
|
|
|
type nopTxCache struct{}
|
|
|
|
var _ txCache = (*nopTxCache)(nil)
|
|
|
|
func (nopTxCache) Reset() {}
|
|
func (nopTxCache) Push(types.Tx) bool { return true }
|
|
func (nopTxCache) Remove(types.Tx) {}
|
|
|
|
//--------------------------------------------------------------------------------
|
|
|
|
// txKey is the fixed length array sha256 hash used as the key in maps.
|
|
func txKey(tx types.Tx) [sha256.Size]byte {
|
|
return sha256.Sum256(tx)
|
|
}
|
|
|
|
// txID is the hex encoded hash of the bytes as a types.Tx.
|
|
func txID(tx []byte) string {
|
|
return fmt.Sprintf("%X", types.Tx(tx).Hash())
|
|
}
|