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133 lines
3.3 KiB
133 lines
3.3 KiB
package types
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import (
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"bytes"
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"errors"
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"fmt"
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abci "github.com/tendermint/tendermint/abci/types"
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"github.com/tendermint/tendermint/crypto/merkle"
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"github.com/tendermint/tendermint/crypto/tmhash"
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cmn "github.com/tendermint/tendermint/libs/common"
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)
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const (
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// MaxAminoOverheadForTx - amino overhead to encode a transaction.
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MaxAminoOverheadForTx = 4
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)
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// Tx is an arbitrary byte array.
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// NOTE: Tx has no types at this level, so when wire encoded it's just length-prefixed.
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// Might we want types here ?
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type Tx []byte
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// Hash computes the TMHASH hash of the wire encoded transaction.
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func (tx Tx) Hash() []byte {
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return tmhash.Sum(tx)
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}
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// String returns the hex-encoded transaction as a string.
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func (tx Tx) String() string {
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return fmt.Sprintf("Tx{%X}", []byte(tx))
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}
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// Txs is a slice of Tx.
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type Txs []Tx
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// Hash returns the simple Merkle root hash of the transactions.
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func (txs Txs) Hash() []byte {
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// Recursive impl.
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// Copied from tendermint/crypto/merkle to avoid allocations
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switch len(txs) {
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case 0:
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return nil
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case 1:
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return txs[0].Hash()
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default:
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left := Txs(txs[:(len(txs)+1)/2]).Hash()
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right := Txs(txs[(len(txs)+1)/2:]).Hash()
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return merkle.SimpleHashFromTwoHashes(left, right)
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}
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}
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// Index returns the index of this transaction in the list, or -1 if not found
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func (txs Txs) Index(tx Tx) int {
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for i := range txs {
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if bytes.Equal(txs[i], tx) {
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return i
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}
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}
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return -1
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}
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// IndexByHash returns the index of this transaction hash in the list, or -1 if not found
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func (txs Txs) IndexByHash(hash []byte) int {
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for i := range txs {
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if bytes.Equal(txs[i].Hash(), hash) {
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return i
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}
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}
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return -1
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}
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// Proof returns a simple merkle proof for this node.
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// Panics if i < 0 or i >= len(txs)
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// TODO: optimize this!
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func (txs Txs) Proof(i int) TxProof {
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l := len(txs)
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hashers := make([]merkle.Hasher, l)
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for i := 0; i < l; i++ {
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hashers[i] = txs[i]
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}
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root, proofs := merkle.SimpleProofsFromHashers(hashers)
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return TxProof{
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Index: i,
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Total: l,
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RootHash: root,
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Data: txs[i],
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Proof: *proofs[i],
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}
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}
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// TxProof represents a Merkle proof of the presence of a transaction in the Merkle tree.
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type TxProof struct {
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Index, Total int
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RootHash cmn.HexBytes
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Data Tx
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Proof merkle.SimpleProof
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}
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// LeadHash returns the hash of the this proof refers to.
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func (tp TxProof) LeafHash() []byte {
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return tp.Data.Hash()
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}
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// Validate verifies the proof. It returns nil if the RootHash matches the dataHash argument,
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// and if the proof is internally consistent. Otherwise, it returns a sensible error.
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func (tp TxProof) Validate(dataHash []byte) error {
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if !bytes.Equal(dataHash, tp.RootHash) {
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return errors.New("Proof matches different data hash")
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}
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if tp.Index < 0 {
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return errors.New("Proof index cannot be negative")
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}
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if tp.Total <= 0 {
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return errors.New("Proof total must be positive")
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}
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valid := tp.Proof.Verify(tp.Index, tp.Total, tp.LeafHash(), tp.RootHash)
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if !valid {
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return errors.New("Proof is not internally consistent")
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}
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return nil
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}
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// TxResult contains results of executing the transaction.
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//
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// One usage is indexing transaction results.
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type TxResult struct {
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Height int64 `json:"height"`
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Index uint32 `json:"index"`
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Tx Tx `json:"tx"`
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Result abci.ResponseDeliverTx `json:"result"`
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}
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