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package merkle
import (
cmn "github.com/tendermint/tmlibs/common"
"golang.org/x/crypto/ripemd160"
)
type SimpleMap struct {
kvs cmn.KVPairs
sorted bool
}
func NewSimpleMap() *SimpleMap {
return &SimpleMap{
kvs: nil,
sorted: false,
}
}
func (sm *SimpleMap) Set(key string, value Hasher) {
sm.sorted = false
// Hash the key to blind it... why not?
khash := SimpleHashFromBytes([]byte(key))
// And the value is hashed too, so you can
// check for equality with a cached value (say)
// and make a determination to fetch or not.
vhash := value.Hash()
sm.kvs = append(sm.kvs, cmn.KVPair{
Key: khash,
Value: vhash,
})
}
// Merkle root hash of items sorted by key
// (UNSTABLE: and by value too if duplicate key).
func (sm *SimpleMap) Hash() []byte {
sm.Sort()
return hashKVPairs(sm.kvs)
}
func (sm *SimpleMap) Sort() {
if sm.sorted {
return
}
sm.kvs.Sort()
sm.sorted = true
}
// Returns a copy of sorted KVPairs.
func (sm *SimpleMap) KVPairs() cmn.KVPairs {
sm.Sort()
kvs := make(cmn.KVPairs, len(sm.kvs))
copy(kvs, sm.kvs)
return kvs
}
//----------------------------------------
// A local extension to KVPair that can be hashed.
type kvPair cmn.KVPair
func (kv kvPair) Hash() []byte {
hasher := ripemd160.New()
err := encodeByteSlice(hasher, kv.Key)
if err != nil {
panic(err)
}
err = encodeByteSlice(hasher, kv.Value)
if err != nil {
panic(err)
}
return hasher.Sum(nil)
}
func hashKVPairs(kvs cmn.KVPairs) []byte {
kvsH := make([]Hasher, 0, len(kvs))
for _, kvp := range kvs {
kvsH = append(kvsH, kvPair(kvp))
}
return SimpleHashFromHashers(kvsH)
}