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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
}
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