Create & Init Project...

app/service/openplatform/abtest/model/jump/BUILD

@@ -0,0 +1,37 @@
+package(default_visibility = ["//visibility:public"])
+
+load(
+    "@io_bazel_rules_go//go:def.bzl",
+    "go_test",
+    "go_library",
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = ["jump_test.go"],
+    embed = [":go_default_library"],
+    rundir = ".",
+    tags = ["automanaged"],
+    deps = ["//vendor/github.com/smartystreets/goconvey/convey:go_default_library"],
+)
+
+go_library(
+    name = "go_default_library",
+    srcs = ["jump.go"],
+    importpath = "go-common/app/service/openplatform/abtest/model/jump",
+    tags = ["automanaged"],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+    visibility = ["//visibility:public"],
+)

app/service/openplatform/abtest/model/jump/jump.go

@@ -0,0 +1,30 @@
+package jump
+
+import (
+	"bytes"
+	"crypto/md5"
+	"encoding/binary"
+)
+
+//Hash get result by hash
+func Hash(key uint64, numBuckets int) int32 {
+	var b int64 = -1
+	var j int64
+
+	for j < int64(numBuckets) {
+		b = j
+		key = key*2862933555777941757 + 1
+		j = int64(float64(b+1) * (float64(int64(1)<<31) / float64((key>>33)+1)))
+	}
+
+	return int32(b)
+}
+
+//Md5 get result by Md5
+func Md5(key string) uint64 {
+	var x uint64
+	s := md5.Sum([]byte(key))
+	b := bytes.NewBuffer(s[:])
+	binary.Read(b, binary.BigEndian, &x)
+	return x
+}

app/service/openplatform/abtest/model/jump/jump_test.go

@@ -0,0 +1,40 @@
+package jump
+
+import (
+	"testing"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+type hashStruct struct {
+	value uint64
+	exp   int32
+}
+
+func Test_Hash(t *testing.T) {
+	Convey("Test_Hash: ", t, func() {
+		h := hashStruct{
+			value: uint64(314978625),
+			exp:   int32(18),
+		}
+		bucket := 100
+		v := Hash(h.value, bucket)
+		So(v, ShouldEqual, h.exp)
+	})
+}
+
+type md5Struct struct {
+	value string
+	exp   uint64
+}
+
+func Test_Md5(t *testing.T) {
+	Convey("Test_Hash: ", t, func() {
+		h := md5Struct{
+			value: "987654321",
+			exp:   uint64(7979946199622949865),
+		}
+		v := Md5(h.value)
+		So(v, ShouldEqual, h.exp)
+	})
+}