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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 (
"go.mongodb.org/mongo-driver/x/mongo/driver/address"
)
// Topology represents a description of a mongodb topology
type Topology struct {
Servers []Server
Kind TopologyKind
SessionTimeoutMinutes uint32
}
// Server returns the server for the given address. Returns false if the server
// could not be found.
func (t Topology) Server(addr address.Address) (Server, bool) {
for _, server := range t.Servers {
if server.Addr.String() == addr.String() {
return server, true
}
}
return Server{}, false
}
// TopologyDiff is the difference between two different topology descriptions.
type TopologyDiff struct {
Added []Server
Removed []Server
}
// DiffTopology compares the two topology descriptions and returns the difference.
func DiffTopology(old, new 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
}
// 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 (t Topology) DiffHostlist(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
}
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