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95 lines
2.3 KiB
95 lines
2.3 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 takes the recently
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modified state (and the associated transactions) and use that as the 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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. "github.com/tendermint/tendermint/blocks"
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. "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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lastBlock *Block
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state *State
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txs []Tx
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}
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func NewMempool(lastBlock *Block, state *State) *Mempool {
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return &Mempool{
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lastBlock: lastBlock,
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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 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)
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if err != nil {
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return err
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} else {
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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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// Returns a new block from the current state and associated transactions.
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// The block's Validation is empty, and some parts of the header too.
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func (mem *Mempool) MakeProposalBlock() (*Block, *State) {
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mem.mtx.Lock()
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defer mem.mtx.Unlock()
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nextBlock := mem.lastBlock.MakeNextBlock()
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nextBlock.Data.Txs = mem.txs
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return nextBlock, mem.state
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}
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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 *Block, state *State) {
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mem.mtx.Lock()
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defer mem.mtx.Unlock()
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mem.lastBlock = block
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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 := BinaryHash(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 := []Tx{}
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for _, tx := range mem.txs {
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txHash := BinaryHash(tx)
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if _, ok := blockTxsMap[string(txHash)]; ok {
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continue
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} else {
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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 := []Tx{}
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for _, tx := range txs {
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err := mem.state.ExecTx(tx)
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if err != nil {
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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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}
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}
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// We're done!
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mem.txs = validTxs
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}
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