Add rand package for generation of random numbers

util/rand/ints.go

@@ -0,0 +1,37 @@
+// Copyright © 2016 Abcum Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package rand
+
+import (
+	"time"
+
+	"math/rand"
+)
+
+func init() {
+	rand.Seed(time.Now().UTC().UnixNano())
+}
+
+func Int() int {
+	return rand.Int()
+}
+
+func Int64() int64 {
+	return rand.Int63()
+}
+
+func Float64() float64 {
+	return rand.Float64()
+}