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86 lines
1.6 KiB
86 lines
1.6 KiB
package merkle
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import (
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"github.com/tendermint/go-wire"
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cmn "github.com/tendermint/tmlibs/common"
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"golang.org/x/crypto/ripemd160"
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)
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type SimpleMap struct {
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kvs cmn.KVPairs
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sorted bool
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}
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func NewSimpleMap() *SimpleMap {
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return &SimpleMap{
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kvs: nil,
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sorted: false,
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}
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}
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func (sm *SimpleMap) Set(key string, value interface{}) {
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sm.sorted = false
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// Is value Hashable?
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var vBytes []byte
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if hashable, ok := value.(Hashable); ok {
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vBytes = hashable.Hash()
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} else {
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vBytes = wire.BinaryBytes(value)
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}
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sm.kvs = append(sm.kvs, cmn.KVPair{
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Key: []byte(key),
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Value: vBytes,
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})
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}
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// Merkle root hash of items sorted by key.
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// NOTE: Behavior is undefined when key is duplicate.
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func (sm *SimpleMap) Hash() []byte {
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sm.Sort()
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return hashKVPairs(sm.kvs)
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}
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func (sm *SimpleMap) Sort() {
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if sm.sorted {
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return
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}
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sm.kvs.Sort()
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sm.sorted = true
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}
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// Returns a copy of sorted KVPairs.
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// CONTRACT: The returned slice must not be mutated.
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func (sm *SimpleMap) KVPairs() cmn.KVPairs {
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sm.Sort()
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kvs := make(cmn.KVPairs, len(sm.kvs))
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copy(kvs, sm.kvs)
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return kvs
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}
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//----------------------------------------
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// A local extension to KVPair that can be hashed.
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type kvPair cmn.KVPair
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func (kv kvPair) Hash() []byte {
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hasher, n, err := ripemd160.New(), new(int), new(error)
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wire.WriteByteSlice(kv.Key, hasher, n, err)
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if *err != nil {
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panic(*err)
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}
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wire.WriteByteSlice(kv.Value, hasher, n, err)
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if *err != nil {
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panic(*err)
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}
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return hasher.Sum(nil)
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}
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func hashKVPairs(kvs cmn.KVPairs) []byte {
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kvsH := make([]Hashable, 0, len(kvs))
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for _, kvp := range kvs {
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kvsH = append(kvsH, kvPair(kvp))
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}
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return SimpleHashFromHashables(kvsH)
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}
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