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From GitBox <...@apache.org>
Subject [GitHub] [dubbo-go] zouyx commented on a change in pull request #647: Ftr: experimentally distributed transaction based on seata-golang
Date Tue, 07 Jul 2020 05:52:14 GMT

zouyx commented on a change in pull request #647:
URL: https://github.com/apache/dubbo-go/pull/647#discussion_r450625133



##########
File path: filter/filter_impl/seata_filter.go
##########
@@ -0,0 +1,63 @@
+/*
+ * 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 filter_impl
+
+import (
+	"context"
+)
+
+import (
+	"github.com/apache/dubbo-go/common/extension"
+	"github.com/apache/dubbo-go/common/logger"
+	"github.com/apache/dubbo-go/filter"
+	"github.com/apache/dubbo-go/protocol"
+)
+
+const (
+	SEATA     = "SEATA"
+	SEATA_XID = "SEATA_XID"
+)
+
+func init() {
+	extension.SetFilter(SEATA, GetSeataFilter)
+}
+
+// SeataFilter when use seata-golang, use this filter to transfer xid
+type SeataFilter struct{}
+
+// When use Seata, transfer xid by attachments
+// Invoke Get Xid by attachment key `SEATA_XID`
+func (sf *SeataFilter) Invoke(ctx context.Context, invoker protocol.Invoker, invocation protocol.Invocation)
protocol.Result {
+	logger.Infof("invoking seata filter.")
+	xid := invocation.AttachmentsByKey(SEATA_XID, "")
+	if xid != "" {
+		logger.Debugf("Method: %v,Xid: %v", invocation.MethodName(), xid)
+		return invoker.Invoke(context.WithValue(ctx, SEATA_XID, xid), invocation)
+	}
+	return invoker.Invoke(ctx, invocation)
+}
+
+// OnResponse dummy process, returns the result directly
+func (sf *SeataFilter) OnResponse(ctx context.Context, result protocol.Result, invoker protocol.Invoker,
invocation protocol.Invocation) protocol.Result {
+	return result
+}
+
+// GetSeataFilter create SeataFilter instance
+func GetSeataFilter() filter.Filter {

Review comment:
       why public method´╝č




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