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new f5ee17f feat: add pkg idgen (#188)
f5ee17f is described below
commit f5ee17fcabcaac24e70f6f3a24a2bd77099076de
Author: Alex Zhang <[email protected]>
AuthorDate: Wed Jan 20 18:00:42 2021 +0800
feat: add pkg idgen (#188)
---
pkg/id/idgen.go | 39 +++++++++++++++++++++++++++++++++++++++
pkg/id/idgen_test.go | 30 ++++++++++++++++++++++++++++++
2 files changed, 69 insertions(+)
diff --git a/pkg/id/idgen.go b/pkg/id/idgen.go
new file mode 100644
index 0000000..1999064
--- /dev/null
+++ b/pkg/id/idgen.go
@@ -0,0 +1,39 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You 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 id
+
+import (
+ "fmt"
+ "hash/crc32"
+ "reflect"
+ "unsafe"
+)
+
+// GenID generates an ID according to the raw material.
+func GenID(raw string) string {
+ if raw == "" {
+ return ""
+ }
+ sh := &reflect.SliceHeader{
+ Data: (*reflect.StringHeader)(unsafe.Pointer(&raw)).Data,
+ Len: len(raw),
+ Cap: len(raw),
+ }
+ p := *(*[]byte)(unsafe.Pointer(sh))
+
+ res := crc32.ChecksumIEEE(p)
+ return fmt.Sprintf("%x", res)
+}
diff --git a/pkg/id/idgen_test.go b/pkg/id/idgen_test.go
new file mode 100644
index 0000000..27c04f9
--- /dev/null
+++ b/pkg/id/idgen_test.go
@@ -0,0 +1,30 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You 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 id
+
+import (
+ "testing"
+
+ "github.com/stretchr/testify/assert"
+)
+
+func TestGenID(t *testing.T) {
+ hash := GenID("")
+ assert.Len(t, hash, 0)
+
+ assert.Equal(t, GenID("111"), GenID("111"))
+ assert.NotEqual(t, GenID("112"), GenID("111"))
+}
