add uuid

Author: c-wind

uuid/uuid.go

@@ -0,0 +1,39 @@
+package uuid
+
+import (
+	"encoding/base64"
+	"encoding/binary"
+	"net"
+	"os"
+	"sync/atomic"
+	"time"
+)
+
+var (
+	inc uint32
+	buf = make([]byte, 16)
+)
+
+func init() {
+	addrs, _ := net.InterfaceAddrs()
+	for _, addr := range addrs {
+		if i, ok := addr.(*net.IPNet); ok {
+			if !i.IP.IsLoopback() {
+				i4 := i.IP.To4()
+				if len(i4) == net.IPv4len {
+					buf[0] = i.IP.To4()[2]
+					buf[1] = i.IP.To4()[3]
+					break
+				}
+			}
+		}
+	}
+	binary.LittleEndian.PutUint16(buf[2:], uint16(os.Getpid()))
+}
+
+//String 生成字符串的uuid
+func String() string {
+	binary.BigEndian.PutUint64(buf[4:], uint64(time.Now().Unix()))
+	binary.BigEndian.PutUint32(buf[12:], atomic.AddUint32(&inc, 1))
+	return base64.RawURLEncoding.EncodeToString(buf)
+}

uuid/uuid_test.go

@@ -0,0 +1,12 @@
+package uuid
+
+import (
+	"testing"
+)
+
+func TestUUID(t *testing.T) {
+	for i := 0; i < 1000; i++ {
+		t.Logf("%s", String())
+	}
+
+}