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845 lines
25 KiB
845 lines
25 KiB
package mempool
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import (
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"bytes"
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"context"
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"errors"
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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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abci "github.com/tendermint/tendermint/abci/types"
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"github.com/tendermint/tendermint/config"
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"github.com/tendermint/tendermint/internal/libs/clist"
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"github.com/tendermint/tendermint/internal/proxy"
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"github.com/tendermint/tendermint/libs/log"
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tmmath "github.com/tendermint/tendermint/libs/math"
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"github.com/tendermint/tendermint/types"
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)
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var _ Mempool = (*TxMempool)(nil)
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// TxMempoolOption sets an optional parameter on the TxMempool.
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type TxMempoolOption func(*TxMempool)
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// TxMempool defines a prioritized mempool data structure used by the v1 mempool
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// reactor. It keeps a thread-safe priority queue of transactions that is used
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// when a block proposer constructs a block and a thread-safe linked-list that
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// is used to gossip transactions to peers in a FIFO manner.
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type TxMempool struct {
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logger log.Logger
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metrics *Metrics
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config *config.MempoolConfig
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proxyAppConn proxy.AppConnMempool
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// txsAvailable fires once for each height when the mempool is not empty
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txsAvailable chan struct{}
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notifiedTxsAvailable bool
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// height defines the last block height process during Update()
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height int64
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// sizeBytes defines the total size of the mempool (sum of all tx bytes)
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sizeBytes int64
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// cache defines a fixed-size cache of already seen transactions as this
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// reduces pressure on the proxyApp.
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cache TxCache
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// txStore defines the main storage of valid transactions. Indexes are built
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// on top of this store.
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txStore *TxStore
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// gossipIndex defines the gossiping index of valid transactions via a
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// thread-safe linked-list. We also use the gossip index as a cursor for
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// rechecking transactions already in the mempool.
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gossipIndex *clist.CList
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// recheckCursor and recheckEnd are used as cursors based on the gossip index
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// to recheck transactions that are already in the mempool. Iteration is not
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// thread-safe and transaction may be mutated in serial order.
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//
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// XXX/TODO: It might be somewhat of a codesmell to use the gossip index for
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// iterator and cursor management when rechecking transactions. If the gossip
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// index changes or is removed in a future refactor, this will have to be
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// refactored. Instead, we should consider just keeping a slice of a snapshot
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// of the mempool's current transactions during Update and an integer cursor
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// into that slice. This, however, requires additional O(n) space complexity.
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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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// priorityIndex defines the priority index of valid transactions via a
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// thread-safe priority queue.
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priorityIndex *TxPriorityQueue
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// heightIndex defines a height-based, in ascending order, transaction index.
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// i.e. older transactions are first.
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heightIndex *WrappedTxList
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// timestampIndex defines a timestamp-based, in ascending order, transaction
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// index. i.e. older transactions are first.
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timestampIndex *WrappedTxList
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// A read/write lock is used to safe guard updates, insertions and deletions
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// from the mempool. A read-lock is implicitly acquired when executing CheckTx,
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// however, a caller must explicitly grab a write-lock via Lock when updating
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// the mempool via Update().
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mtx sync.RWMutex
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preCheck PreCheckFunc
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postCheck PostCheckFunc
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}
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func NewTxMempool(
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logger log.Logger,
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cfg *config.MempoolConfig,
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proxyAppConn proxy.AppConnMempool,
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height int64,
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options ...TxMempoolOption,
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) *TxMempool {
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txmp := &TxMempool{
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logger: logger,
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config: cfg,
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proxyAppConn: proxyAppConn,
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height: height,
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cache: NopTxCache{},
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metrics: NopMetrics(),
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txStore: NewTxStore(),
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gossipIndex: clist.New(),
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priorityIndex: NewTxPriorityQueue(),
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heightIndex: NewWrappedTxList(func(wtx1, wtx2 *WrappedTx) bool {
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return wtx1.height >= wtx2.height
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}),
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timestampIndex: NewWrappedTxList(func(wtx1, wtx2 *WrappedTx) bool {
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return wtx1.timestamp.After(wtx2.timestamp) || wtx1.timestamp.Equal(wtx2.timestamp)
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}),
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}
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if cfg.CacheSize > 0 {
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txmp.cache = NewLRUTxCache(cfg.CacheSize)
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}
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for _, opt := range options {
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opt(txmp)
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}
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return txmp
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}
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// WithPreCheck sets a filter for the mempool to reject a transaction if f(tx)
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// returns an error. This is executed before CheckTx. It only applies to the
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// first created block. After that, Update() overwrites the existing value.
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func WithPreCheck(f PreCheckFunc) TxMempoolOption {
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return func(txmp *TxMempool) { txmp.preCheck = f }
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}
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// WithPostCheck sets a filter for the mempool to reject a transaction if
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// f(tx, resp) returns an error. This is executed after CheckTx. It only applies
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// to the first created block. After that, Update overwrites the existing value.
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func WithPostCheck(f PostCheckFunc) TxMempoolOption {
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return func(txmp *TxMempool) { txmp.postCheck = f }
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}
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// WithMetrics sets the mempool's metrics collector.
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func WithMetrics(metrics *Metrics) TxMempoolOption {
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return func(txmp *TxMempool) { txmp.metrics = metrics }
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}
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// Lock obtains a write-lock on the mempool. A caller must be sure to explicitly
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// release the lock when finished.
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func (txmp *TxMempool) Lock() {
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txmp.mtx.Lock()
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}
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// Unlock releases a write-lock on the mempool.
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func (txmp *TxMempool) Unlock() {
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txmp.mtx.Unlock()
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}
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// Size returns the number of valid transactions in the mempool. It is
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// thread-safe.
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func (txmp *TxMempool) Size() int {
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return txmp.txStore.Size()
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}
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// SizeBytes return the total sum in bytes of all the valid transactions in the
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// mempool. It is thread-safe.
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func (txmp *TxMempool) SizeBytes() int64 {
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return atomic.LoadInt64(&txmp.sizeBytes)
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}
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// FlushAppConn executes FlushSync on the mempool's proxyAppConn.
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//
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// NOTE: The caller must obtain a write-lock prior to execution.
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func (txmp *TxMempool) FlushAppConn(ctx context.Context) error {
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return txmp.proxyAppConn.Flush(ctx)
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}
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// WaitForNextTx returns a blocking channel that will be closed when the next
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// valid transaction is available to gossip. It is thread-safe.
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func (txmp *TxMempool) WaitForNextTx() <-chan struct{} {
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return txmp.gossipIndex.WaitChan()
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}
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// NextGossipTx returns the next valid transaction to gossip. A caller must wait
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// for WaitForNextTx to signal a transaction is available to gossip first. It is
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// thread-safe.
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func (txmp *TxMempool) NextGossipTx() *clist.CElement {
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return txmp.gossipIndex.Front()
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}
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// EnableTxsAvailable enables the mempool to trigger events when transactions
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// are available on a block by block basis.
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func (txmp *TxMempool) EnableTxsAvailable() {
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txmp.mtx.Lock()
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defer txmp.mtx.Unlock()
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txmp.txsAvailable = make(chan struct{}, 1)
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}
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// TxsAvailable returns a channel which fires once for every height, and only
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// when transactions are available in the mempool. It is thread-safe.
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func (txmp *TxMempool) TxsAvailable() <-chan struct{} {
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return txmp.txsAvailable
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}
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// CheckTx executes the ABCI CheckTx method for a given transaction.
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// It acquires a read-lock and attempts to execute the application's
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// CheckTx ABCI method synchronously. We return an error if any of
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// the following happen:
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//
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// - The CheckTx execution fails.
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// - The transaction already exists in the cache and we've already received the
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// transaction from the peer. Otherwise, if it solely exists in the cache, we
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// return nil.
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// - The transaction size exceeds the maximum transaction size as defined by the
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// configuration provided to the mempool.
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// - The transaction fails Pre-Check (if it is defined).
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// - The proxyAppConn fails, e.g. the buffer is full.
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//
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// If the mempool is full, we still execute CheckTx and attempt to find a lower
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// priority transaction to evict. If such a transaction exists, we remove the
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// lower priority transaction and add the new one with higher priority.
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//
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// NOTE:
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// - The applications' CheckTx implementation may panic.
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// - The caller is not to explicitly require any locks for executing CheckTx.
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func (txmp *TxMempool) CheckTx(
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ctx context.Context,
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tx types.Tx,
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cb func(*abci.ResponseCheckTx),
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txInfo TxInfo,
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) error {
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txmp.mtx.RLock()
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defer txmp.mtx.RUnlock()
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if txSize := len(tx); txSize > txmp.config.MaxTxBytes {
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return types.ErrTxTooLarge{
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Max: txmp.config.MaxTxBytes,
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Actual: txSize,
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}
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}
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if txmp.preCheck != nil {
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if err := txmp.preCheck(tx); err != nil {
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return types.ErrPreCheck{Reason: err}
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}
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}
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if err := txmp.proxyAppConn.Error(); err != nil {
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return err
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}
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txHash := tx.Key()
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// We add the transaction to the mempool's cache and if the
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// transaction is already present in the cache, i.e. false is returned, then we
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// check if we've seen this transaction and error if we have.
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if !txmp.cache.Push(tx) {
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txmp.txStore.GetOrSetPeerByTxHash(txHash, txInfo.SenderID)
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return types.ErrTxInCache
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}
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res, err := txmp.proxyAppConn.CheckTx(ctx, abci.RequestCheckTx{Tx: tx})
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if err != nil {
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txmp.cache.Remove(tx)
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return err
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}
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if txmp.recheckCursor != nil {
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return errors.New("recheck cursor is non-nil")
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}
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wtx := &WrappedTx{
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tx: tx,
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hash: txHash,
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timestamp: time.Now().UTC(),
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height: txmp.height,
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}
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txmp.defaultTxCallback(tx, res)
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txmp.initTxCallback(wtx, res, txInfo)
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if cb != nil {
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cb(res)
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}
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return nil
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}
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func (txmp *TxMempool) RemoveTxByKey(txKey types.TxKey) error {
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txmp.Lock()
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defer txmp.Unlock()
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// remove the committed transaction from the transaction store and indexes
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if wtx := txmp.txStore.GetTxByHash(txKey); wtx != nil {
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txmp.removeTx(wtx, false)
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return nil
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}
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return errors.New("transaction not found")
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}
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// Flush empties the mempool. It acquires a read-lock, fetches all the
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// transactions currently in the transaction store and removes each transaction
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// from the store and all indexes and finally resets the cache.
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//
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// NOTE:
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// - Flushing the mempool may leave the mempool in an inconsistent state.
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func (txmp *TxMempool) Flush() {
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txmp.mtx.RLock()
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defer txmp.mtx.RUnlock()
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txmp.heightIndex.Reset()
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txmp.timestampIndex.Reset()
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for _, wtx := range txmp.txStore.GetAllTxs() {
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txmp.removeTx(wtx, false)
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}
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atomic.SwapInt64(&txmp.sizeBytes, 0)
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txmp.cache.Reset()
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}
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// ReapMaxBytesMaxGas returns a list of transactions within the provided size
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// and gas constraints. Transaction are retrieved in priority order.
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//
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// NOTE:
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// - Transactions returned are not removed from the mempool transaction
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// store or indexes.
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func (txmp *TxMempool) ReapMaxBytesMaxGas(maxBytes, maxGas int64) types.Txs {
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txmp.mtx.RLock()
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defer txmp.mtx.RUnlock()
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var (
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totalGas int64
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totalSize int64
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)
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// wTxs contains a list of *WrappedTx retrieved from the priority queue that
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// need to be re-enqueued prior to returning.
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wTxs := make([]*WrappedTx, 0, txmp.priorityIndex.NumTxs())
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defer func() {
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for _, wtx := range wTxs {
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txmp.priorityIndex.PushTx(wtx)
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}
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}()
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txs := make([]types.Tx, 0, txmp.priorityIndex.NumTxs())
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for txmp.priorityIndex.NumTxs() > 0 {
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wtx := txmp.priorityIndex.PopTx()
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txs = append(txs, wtx.tx)
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wTxs = append(wTxs, wtx)
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size := types.ComputeProtoSizeForTxs([]types.Tx{wtx.tx})
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// Ensure we have capacity for the transaction with respect to the
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// transaction size.
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if maxBytes > -1 && totalSize+size > maxBytes {
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return txs[:len(txs)-1]
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}
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totalSize += size
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// ensure we have capacity for the transaction with respect to total gas
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gas := totalGas + wtx.gasWanted
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if maxGas > -1 && gas > maxGas {
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return txs[:len(txs)-1]
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}
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totalGas = gas
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}
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return txs
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}
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// ReapMaxTxs returns a list of transactions within the provided number of
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// transactions bound. Transaction are retrieved in priority order.
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//
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// NOTE:
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// - Transactions returned are not removed from the mempool transaction
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// store or indexes.
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func (txmp *TxMempool) ReapMaxTxs(max int) types.Txs {
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txmp.mtx.RLock()
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defer txmp.mtx.RUnlock()
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numTxs := txmp.priorityIndex.NumTxs()
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if max < 0 {
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max = numTxs
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}
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cap := tmmath.MinInt(numTxs, max)
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// wTxs contains a list of *WrappedTx retrieved from the priority queue that
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// need to be re-enqueued prior to returning.
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wTxs := make([]*WrappedTx, 0, cap)
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txs := make([]types.Tx, 0, cap)
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for txmp.priorityIndex.NumTxs() > 0 && len(txs) < max {
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wtx := txmp.priorityIndex.PopTx()
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txs = append(txs, wtx.tx)
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wTxs = append(wTxs, wtx)
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}
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for _, wtx := range wTxs {
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txmp.priorityIndex.PushTx(wtx)
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}
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return txs
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}
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// Update iterates over all the transactions provided by the block producer,
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// removes them from the cache (if applicable), and removes
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// the transactions from the main transaction store and associated indexes.
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// If there are transactions remaining in the mempool, we initiate a
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// re-CheckTx for them (if applicable), otherwise, we notify the caller more
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// transactions are available.
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//
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// NOTE:
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// - The caller must explicitly acquire a write-lock.
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func (txmp *TxMempool) Update(
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ctx context.Context,
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blockHeight int64,
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blockTxs types.Txs,
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execTxResult []*abci.ExecTxResult,
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newPreFn PreCheckFunc,
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newPostFn PostCheckFunc,
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) error {
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txmp.height = blockHeight
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txmp.notifiedTxsAvailable = false
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if newPreFn != nil {
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txmp.preCheck = newPreFn
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}
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if newPostFn != nil {
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txmp.postCheck = newPostFn
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}
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for i, tx := range blockTxs {
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if execTxResult[i].Code == abci.CodeTypeOK {
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// add the valid committed transaction to the cache (if missing)
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_ = txmp.cache.Push(tx)
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} else if !txmp.config.KeepInvalidTxsInCache {
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// allow invalid transactions to be re-submitted
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txmp.cache.Remove(tx)
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}
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// remove the committed transaction from the transaction store and indexes
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if wtx := txmp.txStore.GetTxByHash(tx.Key()); wtx != nil {
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txmp.removeTx(wtx, false)
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}
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}
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txmp.purgeExpiredTxs(blockHeight)
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// If there any uncommitted transactions left in the mempool, we either
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// initiate re-CheckTx per remaining transaction or notify that remaining
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// transactions are left.
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if txmp.Size() > 0 {
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if txmp.config.Recheck {
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txmp.logger.Debug(
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"executing re-CheckTx for all remaining transactions",
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"num_txs", txmp.Size(),
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"height", blockHeight,
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)
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txmp.updateReCheckTxs(ctx)
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} else {
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txmp.notifyTxsAvailable()
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}
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}
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txmp.metrics.Size.Set(float64(txmp.Size()))
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return nil
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}
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|
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// initTxCallback is the callback invoked for a new unique transaction after CheckTx
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// has been executed by the ABCI application for the first time on that transaction.
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// CheckTx can be called again for the same transaction later when re-checking;
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// however, this callback will not be called.
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//
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// initTxCallback runs after the ABCI application executes CheckTx.
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// It runs the postCheck hook if one is defined on the mempool.
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// If the CheckTx response response code is not OK, or if the postCheck hook
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// reports an error, the transaction is rejected. Otherwise, we attempt to insert
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// the transaction into the mempool.
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//
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// When inserting a transaction, we first check if there is sufficient capacity.
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// If there is, the transaction is added to the txStore and all indexes.
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// Otherwise, if the mempool is full, we attempt to find a lower priority transaction
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// to evict in place of the new incoming transaction. If no such transaction exists,
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// the new incoming transaction is rejected.
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//
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// NOTE:
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// - An explicit lock is NOT required.
|
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func (txmp *TxMempool) initTxCallback(wtx *WrappedTx, res *abci.ResponseCheckTx, txInfo TxInfo) {
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var err error
|
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if txmp.postCheck != nil {
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err = txmp.postCheck(wtx.tx, res)
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}
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|
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if err != nil || res.Code != abci.CodeTypeOK {
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// ignore bad transactions
|
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txmp.logger.Info(
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"rejected bad transaction",
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"priority", wtx.priority,
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"tx", fmt.Sprintf("%X", wtx.tx.Hash()),
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"peer_id", txInfo.SenderNodeID,
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"code", res.Code,
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"post_check_err", err,
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)
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|
|
txmp.metrics.FailedTxs.Add(1)
|
|
|
|
if !txmp.config.KeepInvalidTxsInCache {
|
|
txmp.cache.Remove(wtx.tx)
|
|
}
|
|
if err != nil {
|
|
res.MempoolError = err.Error()
|
|
}
|
|
return
|
|
}
|
|
|
|
sender := res.Sender
|
|
priority := res.Priority
|
|
|
|
if len(sender) > 0 {
|
|
if wtx := txmp.txStore.GetTxBySender(sender); wtx != nil {
|
|
txmp.logger.Error(
|
|
"rejected incoming good transaction; tx already exists for sender",
|
|
"tx", fmt.Sprintf("%X", wtx.tx.Hash()),
|
|
"sender", sender,
|
|
)
|
|
txmp.metrics.RejectedTxs.Add(1)
|
|
return
|
|
}
|
|
}
|
|
|
|
if err := txmp.canAddTx(wtx); err != nil {
|
|
evictTxs := txmp.priorityIndex.GetEvictableTxs(
|
|
priority,
|
|
int64(wtx.Size()),
|
|
txmp.SizeBytes(),
|
|
txmp.config.MaxTxsBytes,
|
|
)
|
|
if len(evictTxs) == 0 {
|
|
// No room for the new incoming transaction so we just remove it from
|
|
// the cache.
|
|
txmp.cache.Remove(wtx.tx)
|
|
txmp.logger.Error(
|
|
"rejected incoming good transaction; mempool full",
|
|
"tx", fmt.Sprintf("%X", wtx.tx.Hash()),
|
|
"err", err.Error(),
|
|
)
|
|
txmp.metrics.RejectedTxs.Add(1)
|
|
return
|
|
}
|
|
|
|
// evict an existing transaction(s)
|
|
//
|
|
// NOTE:
|
|
// - The transaction, toEvict, can be removed while a concurrent
|
|
// reCheckTx callback is being executed for the same transaction.
|
|
for _, toEvict := range evictTxs {
|
|
txmp.removeTx(toEvict, true)
|
|
txmp.logger.Debug(
|
|
"evicted existing good transaction; mempool full",
|
|
"old_tx", fmt.Sprintf("%X", toEvict.tx.Hash()),
|
|
"old_priority", toEvict.priority,
|
|
"new_tx", fmt.Sprintf("%X", wtx.tx.Hash()),
|
|
"new_priority", wtx.priority,
|
|
)
|
|
txmp.metrics.EvictedTxs.Add(1)
|
|
}
|
|
}
|
|
|
|
wtx.gasWanted = res.GasWanted
|
|
wtx.priority = priority
|
|
wtx.sender = sender
|
|
wtx.peers = map[uint16]struct{}{
|
|
txInfo.SenderID: {},
|
|
}
|
|
|
|
txmp.metrics.TxSizeBytes.Observe(float64(wtx.Size()))
|
|
txmp.metrics.Size.Set(float64(txmp.Size()))
|
|
|
|
txmp.insertTx(wtx)
|
|
txmp.logger.Debug(
|
|
"inserted good transaction",
|
|
"priority", wtx.priority,
|
|
"tx", fmt.Sprintf("%X", wtx.tx.Hash()),
|
|
"height", txmp.height,
|
|
"num_txs", txmp.Size(),
|
|
)
|
|
txmp.notifyTxsAvailable()
|
|
}
|
|
|
|
// defaultTxCallback is the CheckTx application callback used when a
|
|
// transaction is being re-checked (if re-checking is enabled). The
|
|
// caller must hold a mempool write-lock (via Lock()) and when
|
|
// executing Update(), if the mempool is non-empty and Recheck is
|
|
// enabled, then all remaining transactions will be rechecked via
|
|
// CheckTx. The order transactions are rechecked must be the same as
|
|
// the order in which this callback is called.
|
|
func (txmp *TxMempool) defaultTxCallback(tx types.Tx, res *abci.ResponseCheckTx) {
|
|
if txmp.recheckCursor == nil {
|
|
return
|
|
}
|
|
|
|
txmp.metrics.RecheckTimes.Add(1)
|
|
|
|
wtx := txmp.recheckCursor.Value.(*WrappedTx)
|
|
|
|
// Search through the remaining list of tx to recheck for a transaction that matches
|
|
// the one we received from the ABCI application.
|
|
for {
|
|
if bytes.Equal(tx, wtx.tx) {
|
|
// We've found a tx in the recheck list that matches the tx that we
|
|
// received from the ABCI application.
|
|
// Break, and use this transaction for further checks.
|
|
break
|
|
}
|
|
|
|
txmp.logger.Error(
|
|
"re-CheckTx transaction mismatch",
|
|
"got", wtx.tx.Hash(),
|
|
"expected", tx.Key(),
|
|
)
|
|
|
|
if txmp.recheckCursor == txmp.recheckEnd {
|
|
// we reached the end of the recheckTx list without finding a tx
|
|
// matching the one we received from the ABCI application.
|
|
// Return without processing any tx.
|
|
txmp.recheckCursor = nil
|
|
return
|
|
}
|
|
|
|
txmp.recheckCursor = txmp.recheckCursor.Next()
|
|
wtx = txmp.recheckCursor.Value.(*WrappedTx)
|
|
}
|
|
|
|
// Only evaluate transactions that have not been removed. This can happen
|
|
// if an existing transaction is evicted during CheckTx and while this
|
|
// callback is being executed for the same evicted transaction.
|
|
if !txmp.txStore.IsTxRemoved(wtx.hash) {
|
|
var err error
|
|
if txmp.postCheck != nil {
|
|
err = txmp.postCheck(tx, res)
|
|
}
|
|
|
|
if res.Code == abci.CodeTypeOK && err == nil {
|
|
wtx.priority = res.Priority
|
|
} else {
|
|
txmp.logger.Debug(
|
|
"existing transaction no longer valid; failed re-CheckTx callback",
|
|
"priority", wtx.priority,
|
|
"tx", fmt.Sprintf("%X", wtx.tx.Hash()),
|
|
"err", err,
|
|
"code", res.Code,
|
|
)
|
|
|
|
if wtx.gossipEl != txmp.recheckCursor {
|
|
panic("corrupted reCheckTx cursor")
|
|
}
|
|
|
|
txmp.removeTx(wtx, !txmp.config.KeepInvalidTxsInCache)
|
|
}
|
|
}
|
|
|
|
// move reCheckTx cursor to next element
|
|
if txmp.recheckCursor == txmp.recheckEnd {
|
|
txmp.recheckCursor = nil
|
|
} else {
|
|
txmp.recheckCursor = txmp.recheckCursor.Next()
|
|
}
|
|
|
|
if txmp.recheckCursor == nil {
|
|
txmp.logger.Debug("finished rechecking transactions")
|
|
|
|
if txmp.Size() > 0 {
|
|
txmp.notifyTxsAvailable()
|
|
}
|
|
}
|
|
|
|
txmp.metrics.Size.Set(float64(txmp.Size()))
|
|
}
|
|
|
|
// updateReCheckTxs updates the recheck cursors using the gossipIndex. For
|
|
// each transaction, it executes CheckTx. The global callback defined on
|
|
// the proxyAppConn will be executed for each transaction after CheckTx is
|
|
// executed.
|
|
//
|
|
// NOTE:
|
|
// - The caller must have a write-lock when executing updateReCheckTxs.
|
|
func (txmp *TxMempool) updateReCheckTxs(ctx context.Context) {
|
|
if txmp.Size() == 0 {
|
|
panic("attempted to update re-CheckTx txs when mempool is empty")
|
|
}
|
|
|
|
txmp.recheckCursor = txmp.gossipIndex.Front()
|
|
txmp.recheckEnd = txmp.gossipIndex.Back()
|
|
|
|
for e := txmp.gossipIndex.Front(); e != nil; e = e.Next() {
|
|
wtx := e.Value.(*WrappedTx)
|
|
|
|
// Only execute CheckTx if the transaction is not marked as removed which
|
|
// could happen if the transaction was evicted.
|
|
if !txmp.txStore.IsTxRemoved(wtx.hash) {
|
|
res, err := txmp.proxyAppConn.CheckTx(ctx, abci.RequestCheckTx{
|
|
Tx: wtx.tx,
|
|
Type: abci.CheckTxType_Recheck,
|
|
})
|
|
if err != nil {
|
|
// no need in retrying since the tx will be rechecked after the next block
|
|
txmp.logger.Error("failed to execute CheckTx during rechecking", "err", err)
|
|
continue
|
|
}
|
|
txmp.defaultTxCallback(wtx.tx, res)
|
|
}
|
|
}
|
|
|
|
if err := txmp.proxyAppConn.Flush(ctx); err != nil {
|
|
txmp.logger.Error("failed to flush transactions during rechecking", "err", err)
|
|
}
|
|
}
|
|
|
|
// canAddTx returns an error if we cannot insert the provided *WrappedTx into
|
|
// the mempool due to mempool configured constraints. If it returns nil,
|
|
// the transaction can be inserted into the mempool.
|
|
func (txmp *TxMempool) canAddTx(wtx *WrappedTx) error {
|
|
var (
|
|
numTxs = txmp.Size()
|
|
sizeBytes = txmp.SizeBytes()
|
|
)
|
|
|
|
if numTxs >= txmp.config.Size || int64(wtx.Size())+sizeBytes > txmp.config.MaxTxsBytes {
|
|
return types.ErrMempoolIsFull{
|
|
NumTxs: numTxs,
|
|
MaxTxs: txmp.config.Size,
|
|
TxsBytes: sizeBytes,
|
|
MaxTxsBytes: txmp.config.MaxTxsBytes,
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (txmp *TxMempool) insertTx(wtx *WrappedTx) {
|
|
txmp.txStore.SetTx(wtx)
|
|
txmp.priorityIndex.PushTx(wtx)
|
|
txmp.heightIndex.Insert(wtx)
|
|
txmp.timestampIndex.Insert(wtx)
|
|
|
|
// Insert the transaction into the gossip index and mark the reference to the
|
|
// linked-list element, which will be needed at a later point when the
|
|
// transaction is removed.
|
|
gossipEl := txmp.gossipIndex.PushBack(wtx)
|
|
wtx.gossipEl = gossipEl
|
|
|
|
atomic.AddInt64(&txmp.sizeBytes, int64(wtx.Size()))
|
|
}
|
|
|
|
func (txmp *TxMempool) removeTx(wtx *WrappedTx, removeFromCache bool) {
|
|
if txmp.txStore.IsTxRemoved(wtx.hash) {
|
|
return
|
|
}
|
|
|
|
txmp.txStore.RemoveTx(wtx)
|
|
txmp.priorityIndex.RemoveTx(wtx)
|
|
txmp.heightIndex.Remove(wtx)
|
|
txmp.timestampIndex.Remove(wtx)
|
|
|
|
// Remove the transaction from the gossip index and cleanup the linked-list
|
|
// element so it can be garbage collected.
|
|
txmp.gossipIndex.Remove(wtx.gossipEl)
|
|
wtx.gossipEl.DetachPrev()
|
|
|
|
atomic.AddInt64(&txmp.sizeBytes, int64(-wtx.Size()))
|
|
|
|
if removeFromCache {
|
|
txmp.cache.Remove(wtx.tx)
|
|
}
|
|
}
|
|
|
|
// purgeExpiredTxs removes all transactions that have exceeded their respective
|
|
// height- and/or time-based TTLs from their respective indexes. Every expired
|
|
// transaction will be removed from the mempool, but preserved in the cache.
|
|
//
|
|
// NOTE: purgeExpiredTxs must only be called during TxMempool#Update in which
|
|
// the caller has a write-lock on the mempool and so we can safely iterate over
|
|
// the height and time based indexes.
|
|
func (txmp *TxMempool) purgeExpiredTxs(blockHeight int64) {
|
|
now := time.Now()
|
|
expiredTxs := make(map[types.TxKey]*WrappedTx)
|
|
|
|
if txmp.config.TTLNumBlocks > 0 {
|
|
purgeIdx := -1
|
|
for i, wtx := range txmp.heightIndex.txs {
|
|
if (blockHeight - wtx.height) > txmp.config.TTLNumBlocks {
|
|
expiredTxs[wtx.tx.Key()] = wtx
|
|
purgeIdx = i
|
|
} else {
|
|
// since the index is sorted, we know no other txs can be be purged
|
|
break
|
|
}
|
|
}
|
|
|
|
if purgeIdx >= 0 {
|
|
txmp.heightIndex.txs = txmp.heightIndex.txs[purgeIdx+1:]
|
|
}
|
|
}
|
|
|
|
if txmp.config.TTLDuration > 0 {
|
|
purgeIdx := -1
|
|
for i, wtx := range txmp.timestampIndex.txs {
|
|
if now.Sub(wtx.timestamp) > txmp.config.TTLDuration {
|
|
expiredTxs[wtx.tx.Key()] = wtx
|
|
purgeIdx = i
|
|
} else {
|
|
// since the index is sorted, we know no other txs can be be purged
|
|
break
|
|
}
|
|
}
|
|
|
|
if purgeIdx >= 0 {
|
|
txmp.timestampIndex.txs = txmp.timestampIndex.txs[purgeIdx+1:]
|
|
}
|
|
}
|
|
|
|
for _, wtx := range expiredTxs {
|
|
txmp.removeTx(wtx, false)
|
|
}
|
|
}
|
|
|
|
func (txmp *TxMempool) notifyTxsAvailable() {
|
|
if txmp.Size() == 0 {
|
|
panic("attempt to notify txs available but mempool is empty!")
|
|
}
|
|
|
|
if txmp.txsAvailable != nil && !txmp.notifiedTxsAvailable {
|
|
// channel cap is 1, so this will send once
|
|
txmp.notifiedTxsAvailable = true
|
|
|
|
select {
|
|
case txmp.txsAvailable <- struct{}{}:
|
|
default:
|
|
}
|
|
}
|
|
}
|