initial commit

client/extra.go

@@ -0,0 +1,20 @@
+package client
+
+import (
+	"fmt"
+	"math/rand"
+)
+
+type ExtraGenerator func() string
+
+func UuidV4Generator() ExtraGenerator {
+	return func() string {
+		var uuid [16]byte
+		rand.Read(uuid[:])
+
+		uuid[6] = (uuid[6] & 0x0f) | 0x40
+		uuid[8] = (uuid[8] & 0x3f) | 0x80
+
+		return fmt.Sprintf("%08x-%04x-%04x-%04x-%012x", uuid[:4], uuid[4:6], uuid[6:8], uuid[8:10], uuid[10:])
+	}
+}