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package test
import (
"sync"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
)
// hashPool is a test helper, that allows random hashes to be referred to by integers
type TestHashPool struct {
intToHash
hashToInt
lock sync.Mutex
}
func NewHashPool() *TestHashPool {
return &TestHashPool{intToHash: make(intToHash), hashToInt: make(hashToInt)}
}
type intToHash map[int]common.Hash
type hashToInt map[common.Hash]int
func newHash(i int) common.Hash {
return common.BytesToHash(crypto.Sha3([]byte(string(i))))
}
func (self *TestHashPool) IndexesToHashes(indexes []int) (hashes []common.Hash) {
self.lock.Lock()
defer self.lock.Unlock()
for _, i := range indexes {
hash, found := self.intToHash[i]
if !found {
hash = newHash(i)
self.intToHash[i] = hash
self.hashToInt[hash] = i
}
hashes = append(hashes, hash)
}
return
}
func (self *TestHashPool) HashesToIndexes(hashes []common.Hash) (indexes []int) {
self.lock.Lock()
defer self.lock.Unlock()
for _, hash := range hashes {
i, found := self.hashToInt[hash]
if !found {
i = -1
}
indexes = append(indexes, i)
}
return
}
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