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98 lines
2.5 KiB
98 lines
2.5 KiB
/*
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Mempool receives new transactions and applies them to the latest committed state.
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If the transaction is acceptable, then it broadcasts the tx to peers.
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When this node happens to be the next proposer, it simply uses the recently
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modified state (and the associated transactions) to construct a proposal.
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*/
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package mempool
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import (
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"sync"
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"github.com/tendermint/tendermint/binary"
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blk "github.com/tendermint/tendermint/block"
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sm "github.com/tendermint/tendermint/state"
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)
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type Mempool struct {
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mtx sync.Mutex
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state *sm.State
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txs []blk.Tx
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}
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func NewMempool(state *sm.State) *Mempool {
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return &Mempool{
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state: state,
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}
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}
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// Apply tx to the state and remember it.
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func (mem *Mempool) AddTx(tx blk.Tx) (err error) {
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mem.mtx.Lock()
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defer mem.mtx.Unlock()
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err = mem.state.ExecTx(tx, false)
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if err != nil {
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log.Debug("AddTx() error", "tx", tx, "error", err)
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return err
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} else {
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log.Debug("AddTx() success", "tx", tx)
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mem.txs = append(mem.txs, tx)
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return nil
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}
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}
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func (mem *Mempool) GetProposalTxs() []blk.Tx {
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mem.mtx.Lock()
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defer mem.mtx.Unlock()
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log.Debug("GetProposalTxs:", "txs", mem.txs)
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return mem.txs
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}
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// "block" is the new block being committed.
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// "state" is the result of state.AppendBlock("block").
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// Txs that are present in "block" are discarded from mempool.
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// Txs that have become invalid in the new "state" are also discarded.
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func (mem *Mempool) ResetForBlockAndState(block *blk.Block, state *sm.State) {
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mem.mtx.Lock()
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defer mem.mtx.Unlock()
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mem.state = state.Copy()
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// First, create a lookup map of txns in new block.
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blockTxsMap := make(map[string]struct{})
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for _, tx := range block.Data.Txs {
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txHash := binary.BinarySha256(tx)
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blockTxsMap[string(txHash)] = struct{}{}
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}
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// Next, filter all txs from mem.txs that are in blockTxsMap
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txs := []blk.Tx{}
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for _, tx := range mem.txs {
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txHash := binary.BinarySha256(tx)
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if _, ok := blockTxsMap[string(txHash)]; ok {
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log.Debug("Filter out, already committed", "tx", tx, "txHash", txHash)
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continue
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} else {
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log.Debug("Filter in, still new", "tx", tx, "txHash", txHash)
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txs = append(txs, tx)
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}
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}
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// Next, filter all txs that aren't valid given new state.
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validTxs := []blk.Tx{}
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for _, tx := range txs {
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err := mem.state.ExecTx(tx, false)
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if err == nil {
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log.Debug("Filter in, valid", "tx", tx)
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validTxs = append(validTxs, tx)
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} else {
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// tx is no longer valid.
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log.Debug("Filter out, no longer valid", "tx", tx, "error", err)
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}
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}
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// We're done!
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log.Debug("New txs", "txs", validTxs, "oldTxs", mem.txs)
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mem.txs = validTxs
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}
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