1.修改代码适配阿里云的服务器

server/vendor/go.mongodb.org/mongo-driver/v2/mongo/readconcern/readconcern.go

@@ -0,0 +1,65 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// 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
+
+// Package readconcern defines read concerns for MongoDB operations.
+//
+// For more information about MongoDB read concerns, see
+// https://www.mongodb.com/docs/manual/reference/read-concern/
+package readconcern
+
+// A ReadConcern defines a MongoDB read concern, which allows you to control the consistency and
+// isolation properties of the data read from replica sets and replica set shards.
+//
+// For more information about MongoDB read concerns, see
+// https://www.mongodb.com/docs/manual/reference/read-concern/
+type ReadConcern struct {
+	Level string
+}
+
+// Local returns a ReadConcern that requests data from the instance with no guarantee that the data
+// has been written to a majority of the replica set members (i.e. may be rolled back).
+//
+// For more information about read concern "local", see
+// https://www.mongodb.com/docs/manual/reference/read-concern-local/
+func Local() *ReadConcern {
+	return &ReadConcern{Level: "local"}
+}
+
+// Majority returns a ReadConcern that requests data that has been acknowledged by a majority of the
+// replica set members (i.e. the documents read are durable and guaranteed not to roll back).
+//
+// For more information about read concern "majority", see
+// https://www.mongodb.com/docs/manual/reference/read-concern-majority/
+func Majority() *ReadConcern {
+	return &ReadConcern{Level: "majority"}
+}
+
+// Linearizable returns a ReadConcern that requests data that reflects all successful
+// majority-acknowledged writes that completed prior to the start of the read operation.
+//
+// For more information about read concern "linearizable", see
+// https://www.mongodb.com/docs/manual/reference/read-concern-linearizable/
+func Linearizable() *ReadConcern {
+	return &ReadConcern{Level: "linearizable"}
+}
+
+// Available returns a ReadConcern that requests data from an instance with no guarantee that the
+// data has been written to a majority of the replica set members (i.e. may be rolled back).
+//
+// For more information about read concern "available", see
+// https://www.mongodb.com/docs/manual/reference/read-concern-available/
+func Available() *ReadConcern {
+	return &ReadConcern{Level: "available"}
+}
+
+// Snapshot returns a ReadConcern that requests majority-committed data as it appears across shards
+// from a specific single point in time in the recent past.
+//
+// For more information about read concern "snapshot", see
+// https://www.mongodb.com/docs/manual/reference/read-concern-snapshot/
+func Snapshot() *ReadConcern {
+	return &ReadConcern{Level: "snapshot"}
+}