syncthing/lib/discover/discover.go

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// Copyright (C) 2015 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
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package discover
import (
"context"
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"time"
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"github.com/syncthing/syncthing/lib/protocol"
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"github.com/thejerf/suture/v4"
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)
// A Finder provides lookup services of some kind.
type Finder interface {
Lookup(ctx context.Context, deviceID protocol.DeviceID) (address []string, err error)
Error() error
String() string
Cache() map[protocol.DeviceID]CacheEntry
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}
type CacheEntry struct {
Addresses []string `json:"addresses"`
when time.Time // When did we get the result
found bool // Is it a success (cacheTime applies) or a failure (negCacheTime applies)?
validUntil time.Time // Validity time, overrides normal calculation
instanceID int64 // for local discovery, the instance ID (random on each restart)
}
// A FinderService is a Finder that has background activity and must be run as
// a suture.Service.
type FinderService interface {
Finder
suture.Service
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}
// The AddressLister answers questions about what addresses we are listening
// on.
type AddressLister interface {
ExternalAddresses() []string
AllAddresses() []string
}