67 lines
1.9 KiB
Go
67 lines
1.9 KiB
Go
// Copyright (C) MongoDB, Inc. 2017-present.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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package description
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import (
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"fmt"
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"go.mongodb.org/mongo-driver/bson"
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"go.mongodb.org/mongo-driver/bson/primitive"
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)
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// TopologyVersion represents a software version.
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type TopologyVersion struct {
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ProcessID primitive.ObjectID
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Counter int64
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}
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// NewTopologyVersion creates a TopologyVersion based on doc
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func NewTopologyVersion(doc bson.Raw) (*TopologyVersion, error) {
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elements, err := doc.Elements()
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if err != nil {
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return nil, err
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}
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var tv TopologyVersion
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var ok bool
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for _, element := range elements {
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switch element.Key() {
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case "processId":
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tv.ProcessID, ok = element.Value().ObjectIDOK()
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if !ok {
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return nil, fmt.Errorf("expected 'processId' to be a objectID but it's a BSON %s", element.Value().Type)
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}
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case "counter":
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tv.Counter, ok = element.Value().Int64OK()
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if !ok {
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return nil, fmt.Errorf("expected 'counter' to be an int64 but it's a BSON %s", element.Value().Type)
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}
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}
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}
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return &tv, nil
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}
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// CompareToIncoming compares the receiver, which represents the currently known TopologyVersion for a server, to an
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// incoming TopologyVersion extracted from a server command response.
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//
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// This returns -1 if the receiver version is less than the response, 0 if the versions are equal, and 1 if the
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// receiver version is greater than the response. This comparison is not commutative.
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func (tv *TopologyVersion) CompareToIncoming(responseTV *TopologyVersion) int {
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if tv == nil || responseTV == nil {
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return -1
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}
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if tv.ProcessID != responseTV.ProcessID {
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return -1
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}
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if tv.Counter == responseTV.Counter {
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return 0
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}
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if tv.Counter < responseTV.Counter {
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return -1
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}
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return 1
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}
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