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617 lines
17 KiB
617 lines
17 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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"encoding/binary"
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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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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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cfg "github.com/tendermint/tendermint/config"
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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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The mempool pushes new txs onto the proxyAppConn.
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It gets a stream of (req, res) tuples from the proxy.
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The mempool stores good txs in a concurrent linked-list.
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Multiple concurrent go-routines can traverse this linked-list
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safely by calling .NextWait() on each element.
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So we have several go-routines:
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1. Consensus calling Update() and Reap() synchronously
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2. Many mempool reactor's peer routines calling CheckTx()
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3. Many mempool reactor's peer routines traversing the txs linked list
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4. Another goroutine calling GarbageCollectTxs() periodically
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To manage these goroutines, there are three methods of locking.
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1. Mutations to the linked-list is protected by an internal mtx (CList is goroutine-safe)
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2. Mutations to the linked-list elements are atomic
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3. CheckTx() calls can be paused upon Update() and Reap(), protected by .proxyMtx
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Garbage collection of old elements from mempool.txs is handlde via
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the DetachPrev() call, which makes old elements not reachable by
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peer broadcastTxRoutine() automatically garbage collected.
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TODO: Better handle abci client errors. (make it automatically handle connection errors)
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*/
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var (
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// ErrTxInCache is returned to the client if we saw tx earlier
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ErrTxInCache = errors.New("Tx already exists in cache")
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// ErrMempoolIsFull means Tendermint & an application can't handle that much load
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ErrMempoolIsFull = errors.New("Mempool is full")
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)
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// TxID is the hex encoded hash of the bytes as a types.Tx.
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func TxID(tx []byte) string {
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return fmt.Sprintf("%X", types.Tx(tx).Hash())
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}
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// Mempool is an ordered in-memory pool for transactions before they are proposed in a consensus
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// round. Transaction validity is checked using the CheckTx abci message before the transaction is
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// added to the pool. The Mempool uses a concurrent list structure for storing transactions that
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// can be efficiently accessed by multiple concurrent readers.
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type Mempool 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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counter int64 // simple incrementing counter
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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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recheckCursor *clist.CElement // next expected response
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recheckEnd *clist.CElement // re-checking stops here
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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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// Filter mempool to only accept txs for which filter(tx) returns true.
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filter func(types.Tx) bool
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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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// MempoolOption sets an optional parameter on the Mempool.
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type MempoolOption func(*Mempool)
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// NewMempool returns a new Mempool with the given configuration and connection to an application.
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func NewMempool(
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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 ...MempoolOption,
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) *Mempool {
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mempool := &Mempool{
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config: config,
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proxyAppConn: proxyAppConn,
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txs: clist.New(),
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counter: 0,
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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.resCb)
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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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// EnableTxsAvailable initializes the TxsAvailable channel,
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// ensuring it will trigger once every height when transactions are available.
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// NOTE: not thread safe - should only be called once, on startup
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func (mem *Mempool) 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 *Mempool) SetLogger(l log.Logger) {
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mem.logger = l
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}
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// WithFilter sets a filter for mempool to only accept txs for which f(tx)
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// returns true.
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func WithFilter(f func(types.Tx) bool) MempoolOption {
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return func(mem *Mempool) { mem.filter = f }
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}
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// WithMetrics sets the metrics.
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func WithMetrics(metrics *Metrics) MempoolOption {
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return func(mem *Mempool) { mem.metrics = metrics }
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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 *Mempool) CloseWAL() bool {
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if mem == nil {
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return false
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}
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mem.proxyMtx.Lock()
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defer mem.proxyMtx.Unlock()
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if mem.wal == nil {
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return false
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}
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if err := mem.wal.Close(); err != nil && mem.logger != nil {
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mem.logger.Error("Mempool.CloseWAL", "err", err)
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}
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mem.wal = nil
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return true
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}
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func (mem *Mempool) InitWAL() {
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walDir := mem.config.WalDir()
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if walDir != "" {
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err := cmn.EnsureDir(walDir, 0700)
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if err != nil {
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cmn.PanicSanity(errors.Wrap(err, "Error ensuring Mempool 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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cmn.PanicSanity(errors.Wrap(err, "Error opening Mempool wal file"))
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}
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mem.wal = af
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}
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}
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// Lock locks the mempool. The consensus must be able to hold lock to safely update.
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func (mem *Mempool) Lock() {
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mem.proxyMtx.Lock()
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}
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// Unlock unlocks the mempool.
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func (mem *Mempool) Unlock() {
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mem.proxyMtx.Unlock()
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}
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// Size returns the number of transactions in the mempool.
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func (mem *Mempool) Size() int {
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return mem.txs.Len()
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}
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// Flushes the mempool connection to ensure async resCb calls are done e.g.
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// from CheckTx.
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func (mem *Mempool) FlushAppConn() error {
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return mem.proxyAppConn.FlushSync()
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}
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// Flush removes all transactions from the mempool and cache
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func (mem *Mempool) 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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}
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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 *Mempool) 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 *Mempool) TxsWaitChan() <-chan struct{} {
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return mem.txs.WaitChan()
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}
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// CheckTx executes a new transaction against the application to determine its validity
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// and whether it should be added to the mempool.
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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 *Mempool) CheckTx(tx types.Tx, cb func(*abci.Response)) (err error) {
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mem.proxyMtx.Lock()
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defer mem.proxyMtx.Unlock()
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if mem.Size() >= mem.config.Size {
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return ErrMempoolIsFull
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}
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if mem.filter != nil && !mem.filter(tx) {
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return
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}
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// CACHE
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if !mem.cache.Push(tx) {
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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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if cb != nil {
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reqRes.SetCallback(cb)
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}
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return nil
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}
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// ABCI callback function
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func (mem *Mempool) resCb(req *abci.Request, res *abci.Response) {
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if mem.recheckCursor == nil {
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mem.resCbNormal(req, res)
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} else {
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mem.resCbRecheck(req, res)
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}
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mem.metrics.Size.Set(float64(mem.Size()))
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}
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func (mem *Mempool) resCbNormal(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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if r.CheckTx.Code == abci.CodeTypeOK {
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mem.counter++
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memTx := &mempoolTx{
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counter: mem.counter,
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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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mem.txs.PushBack(memTx)
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mem.logger.Info("Added good transaction", "tx", TxID(tx), "res", r, "total", mem.Size())
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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)
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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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func (mem *Mempool) 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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memTx := mem.recheckCursor.Value.(*mempoolTx)
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if !bytes.Equal(req.GetCheckTx().Tx, memTx.tx) {
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cmn.PanicSanity(fmt.Sprintf("Unexpected tx response from proxy during recheck\n"+
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"Expected %X, got %X", r.CheckTx.Data, memTx.tx))
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}
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if r.CheckTx.Code == abci.CodeTypeOK {
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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.txs.Remove(mem.recheckCursor)
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mem.recheckCursor.DetachPrev()
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// remove from cache (it might be good later)
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mem.cache.Remove(req.GetCheckTx().Tx)
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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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// TxsAvailable returns a channel which fires once for every height,
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// and only when transactions are available in the mempool.
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// NOTE: the returned channel may be nil if EnableTxsAvailable was not called.
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func (mem *Mempool) TxsAvailable() <-chan struct{} {
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return mem.txsAvailable
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}
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func (mem *Mempool) 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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// ReapMaxBytesMaxGas reaps transactions from the mempool up to maxBytes bytes total
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// with the condition that the total gasWanted must be less than maxGas.
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// If both maxes are negative, there is no cap on the size of all returned
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// transactions (~ all available transactions).
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func (mem *Mempool) ReapMaxBytesMaxGas(maxBytes int, maxGas int64) types.Txs {
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var buf [binary.MaxVarintLen64]byte
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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 int
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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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// amino.UvarintSize is not used here because it won't be possible to reuse buf
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aminoOverhead := binary.PutUvarint(buf[:], uint64(len(memTx.tx)))
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if maxBytes > -1 && totalBytes+len(memTx.tx)+aminoOverhead > maxBytes {
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return txs
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}
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totalBytes += len(memTx.tx) + aminoOverhead
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// Check total gas requirement
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if maxGas > -1 && totalGas+memTx.gasWanted > maxGas {
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return txs
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}
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totalGas += memTx.gasWanted
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txs = append(txs, memTx.tx)
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}
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return txs
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}
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// ReapMaxTxs reaps up to max transactions from the mempool.
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// If max is negative, there is no cap on the size of all returned
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// transactions (~ all available transactions).
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func (mem *Mempool) ReapMaxTxs(max int) types.Txs {
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mem.proxyMtx.Lock()
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defer mem.proxyMtx.Unlock()
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if max < 0 {
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max = mem.txs.Len()
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}
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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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txs := make([]types.Tx, 0, cmn.MinInt(mem.txs.Len(), max))
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for e := mem.txs.Front(); e != nil && len(txs) <= max; e = e.Next() {
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memTx := e.Value.(*mempoolTx)
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txs = append(txs, memTx.tx)
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}
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return txs
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}
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// Update informs the mempool that the given txs were committed and can be discarded.
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// NOTE: this should be called *after* block is committed by consensus.
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// NOTE: unsafe; Lock/Unlock must be managed by caller
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func (mem *Mempool) Update(height int64, txs types.Txs, filter func(types.Tx) bool) error {
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// First, create a lookup map of txns in new txs.
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txsMap := make(map[string]struct{}, len(txs))
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for _, tx := range txs {
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txsMap[string(tx)] = struct{}{}
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}
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// Set height
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mem.height = height
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mem.notifiedTxsAvailable = false
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if filter != nil {
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mem.filter = filter
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}
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// Remove transactions that are already in txs.
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goodTxs := mem.filterTxs(txsMap)
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// Recheck mempool txs if any txs were committed in the block
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// NOTE/XXX: in some apps a tx could be invalidated due to EndBlock,
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// so we really still do need to recheck, but this is for debugging
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if mem.config.Recheck && (mem.config.RecheckEmpty || len(goodTxs) > 0) {
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mem.logger.Info("Recheck txs", "numtxs", len(goodTxs), "height", height)
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mem.recheckTxs(goodTxs)
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// At this point, mem.txs are being rechecked.
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// mem.recheckCursor re-scans mem.txs and possibly removes some txs.
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// Before mem.Reap(), we should wait for mem.recheckCursor to be nil.
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}
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// Update metrics
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mem.metrics.Size.Set(float64(mem.Size()))
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return nil
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}
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func (mem *Mempool) filterTxs(blockTxsMap map[string]struct{}) []types.Tx {
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goodTxs := 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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// Remove the tx if it's alredy in a block.
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if _, ok := blockTxsMap[string(memTx.tx)]; ok {
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// remove from clist
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mem.txs.Remove(e)
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e.DetachPrev()
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// NOTE: we don't remove committed txs from the cache.
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continue
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}
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// Good tx!
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goodTxs = append(goodTxs, memTx.tx)
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}
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return goodTxs
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}
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// NOTE: pass in goodTxs because mem.txs can mutate concurrently.
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func (mem *Mempool) recheckTxs(goodTxs []types.Tx) {
|
|
if len(goodTxs) == 0 {
|
|
return
|
|
}
|
|
atomic.StoreInt32(&mem.rechecking, 1)
|
|
mem.recheckCursor = mem.txs.Front()
|
|
mem.recheckEnd = mem.txs.Back()
|
|
|
|
// Push txs to proxyAppConn
|
|
// NOTE: resCb() may be called concurrently.
|
|
for _, tx := range goodTxs {
|
|
mem.proxyAppConn.CheckTxAsync(tx)
|
|
}
|
|
mem.proxyAppConn.FlushAsync()
|
|
}
|
|
|
|
//--------------------------------------------------------------------------------
|
|
|
|
// mempoolTx is a transaction that successfully ran
|
|
type mempoolTx struct {
|
|
counter int64 // a simple incrementing counter
|
|
height int64 // height that this tx had been validated in
|
|
gasWanted int64 // amount of gas this tx states it will require
|
|
tx types.Tx //
|
|
}
|
|
|
|
// 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 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 // to remove oldest tx when cache gets too big
|
|
}
|
|
|
|
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 := sha256.Sum256(tx)
|
|
if moved, exists := cache.map_[txHash]; exists {
|
|
cache.list.MoveToFront(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)
|
|
}
|
|
}
|
|
cache.list.PushBack(txHash)
|
|
cache.map_[txHash] = cache.list.Back()
|
|
return true
|
|
}
|
|
|
|
// Remove removes the given tx from the cache.
|
|
func (cache *mapTxCache) Remove(tx types.Tx) {
|
|
cache.mtx.Lock()
|
|
txHash := sha256.Sum256(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) {}
|