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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 topology
import "go.mongodb.org/mongo-driver/mongo/description"
// hostlistDiff is the difference between a topology and a host list.
type hostlistDiff struct {
Added []string
Removed []string
}
// diffHostList compares the topology description and host list and returns the difference.
func diffHostList(t description.Topology, hostlist []string) hostlistDiff {
var diff hostlistDiff
oldServers := make(map[string]bool)
for _, s := range t.Servers {
oldServers[s.Addr.String()] = true
}
for _, addr := range hostlist {
if oldServers[addr] {
delete(oldServers, addr)
} else {
diff.Added = append(diff.Added, addr)
}
}
for addr := range oldServers {
diff.Removed = append(diff.Removed, addr)
}
return diff
}
// topologyDiff is the difference between two different topology descriptions.
type topologyDiff struct {
Added []description.Server
Removed []description.Server
}
// diffTopology compares the two topology descriptions and returns the difference.
func diffTopology(old, new description.Topology) topologyDiff {
var diff topologyDiff
oldServers := make(map[string]bool)
for _, s := range old.Servers {
oldServers[s.Addr.String()] = true
}
for _, s := range new.Servers {
addr := s.Addr.String()
if oldServers[addr] {
delete(oldServers, addr)
} else {
diff.Added = append(diff.Added, s)
}
}
for _, s := range old.Servers {
addr := s.Addr.String()
if oldServers[addr] {
diff.Removed = append(diff.Removed, s)
}
}
return diff
}
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