path: root/blockpool/test/hash_pool.go

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
}