datastore: Concurrency fix, closes #77

datastore/lock.go

@@ -0,0 +1,19 @@
+package datastore
+
+import (
+	"strconv"
+	"sync"
+)
+
+type HashLock [4096]sync.RWMutex
+
+func (h *HashLock) Get(hash string) *sync.RWMutex {
+	if len(hash) < 3 {
+		return nil
+	}
+	i, err := strconv.ParseInt(hash[0:3], 16, 0)
+	if err != nil {
+		return nil
+	}
+	return &h[i]
+}