升级流程引擎配置文件版本

vendor/go.mongodb.org/mongo-driver/mongo/description/topology_version.go

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+// 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 description
+
+import (
+	"fmt"
+
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+)
+
+// TopologyVersion represents a software version.
+type TopologyVersion struct {
+	ProcessID primitive.ObjectID
+	Counter   int64
+}
+
+// NewTopologyVersion creates a TopologyVersion based on doc
+func NewTopologyVersion(doc bson.Raw) (*TopologyVersion, error) {
+	elements, err := doc.Elements()
+	if err != nil {
+		return nil, err
+	}
+	var tv TopologyVersion
+	var ok bool
+	for _, element := range elements {
+		switch element.Key() {
+		case "processId":
+			tv.ProcessID, ok = element.Value().ObjectIDOK()
+			if !ok {
+				return nil, fmt.Errorf("expected 'processId' to be a objectID but it's a BSON %s", element.Value().Type)
+			}
+		case "counter":
+			tv.Counter, ok = element.Value().Int64OK()
+			if !ok {
+				return nil, fmt.Errorf("expected 'counter' to be an int64 but it's a BSON %s", element.Value().Type)
+			}
+		}
+	}
+	return &tv, nil
+}
+
+// CompareToIncoming compares the receiver, which represents the currently known TopologyVersion for a server, to an
+// incoming TopologyVersion extracted from a server command response.
+//
+// This returns -1 if the receiver version is less than the response, 0 if the versions are equal, and 1 if the
+// receiver version is greater than the response. This comparison is not commutative.
+func (tv *TopologyVersion) CompareToIncoming(responseTV *TopologyVersion) int {
+	if tv == nil || responseTV == nil {
+		return -1
+	}
+	if tv.ProcessID != responseTV.ProcessID {
+		return -1
+	}
+	if tv.Counter == responseTV.Counter {
+		return 0
+	}
+	if tv.Counter < responseTV.Counter {
+		return -1
+	}
+	return 1
+}