1 files changed, 57 insertions, 0 deletions
diff --git a/blockpool/test/hash_pool.go b/blockpool/test/hash_pool.go
new file mode 100644
index 000000000..4e0332d7d
--- /dev/null
+++ b/blockpool/test/hash_pool.go
@@ -0,0 +1,57 @@
+package test
+
+import (
+	"sync"
+
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+// test helpers
+// TODO: move into common test helper package (see p2p/crypto etc.)
+
+func NewHashPool() *TestHashPool {
+	return &TestHashPool{intToHash: make(intToHash), hashToInt: make(hashToInt)}
+}
+
+type intToHash map[int][]byte
+
+type hashToInt map[string]int
+
+// hashPool is a test helper, that allows random hashes to be referred to by integers
+type TestHashPool struct {
+	intToHash
+	hashToInt
+	lock sync.Mutex
+}
+
+func newHash(i int) []byte {
+	return crypto.Sha3([]byte(string(i)))
+}
+
+func (self *TestHashPool) IndexesToHashes(indexes []int) (hashes [][]byte) {
+	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[string(hash)] = i
+		}
+		hashes = append(hashes, hash)
+	}
+	return
+}
+
+func (self *TestHashPool) HashesToIndexes(hashes [][]byte) (indexes []int) {
+	self.lock.Lock()
+	defer self.lock.Unlock()
+	for _, hash := range hashes {
+		i, found := self.hashToInt[string(hash)]
+		if !found {
+			i = -1
+		}
+		indexes = append(indexes, i)
+	}
+	return
+}