syncthing/lib/config/deviceconfiguration.go
Jakob Borg c6334e61aa
all: Support multiple device connections (fixes #141) (#8918)
This adds the ability to have multiple concurrent connections to a single device. This is primarily useful when the network has multiple physical links for aggregated bandwidth. A single connection will never see a higher rate than a single link can give, but multiple connections are load-balanced over multiple links.

It is also incidentally useful for older multi-core CPUs, where bandwidth could be limited by the TLS performance of a single CPU core -- using multiple connections achieves concurrency in the required crypto calculations...

Co-authored-by: Simon Frei <freisim93@gmail.com>
Co-authored-by: tomasz1986 <twilczynski@naver.com>
Co-authored-by: bt90 <btom1990@googlemail.com>
2023-09-06 12:52:01 +02:00

102 lines
2.9 KiB
Go

// Copyright (C) 2014 The Syncthing Authors.
//
// 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/.
package config
import (
"fmt"
"sort"
)
const defaultNumConnections = 1 // number of connections to use by default; may change in the future.
func (cfg DeviceConfiguration) Copy() DeviceConfiguration {
c := cfg
c.Addresses = make([]string, len(cfg.Addresses))
copy(c.Addresses, cfg.Addresses)
c.AllowedNetworks = make([]string, len(cfg.AllowedNetworks))
copy(c.AllowedNetworks, cfg.AllowedNetworks)
c.IgnoredFolders = make([]ObservedFolder, len(cfg.IgnoredFolders))
copy(c.IgnoredFolders, cfg.IgnoredFolders)
return c
}
func (cfg *DeviceConfiguration) prepare(sharedFolders []string) {
if len(cfg.Addresses) == 0 || len(cfg.Addresses) == 1 && cfg.Addresses[0] == "" {
cfg.Addresses = []string{"dynamic"}
}
ignoredFolders := deduplicateObservedFoldersToMap(cfg.IgnoredFolders)
for _, sharedFolder := range sharedFolders {
delete(ignoredFolders, sharedFolder)
}
cfg.IgnoredFolders = sortedObservedFolderSlice(ignoredFolders)
// A device cannot be simultaneously untrusted and an introducer, nor
// auto accept folders.
if cfg.Untrusted {
if cfg.Introducer {
l.Warnf("Device %s (%s) is both untrusted and an introducer, removing introducer flag", cfg.DeviceID.Short(), cfg.Name)
cfg.Introducer = false
}
if cfg.AutoAcceptFolders {
l.Warnf("Device %s (%s) is both untrusted and auto-accepting folders, removing auto-accept flag", cfg.DeviceID.Short(), cfg.Name)
cfg.AutoAcceptFolders = false
}
}
}
func (cfg *DeviceConfiguration) NumConnections() int {
switch {
case cfg.RawNumConnections == 0:
return defaultNumConnections
case cfg.RawNumConnections < 0:
return 1
default:
return cfg.RawNumConnections
}
}
func (cfg *DeviceConfiguration) IgnoredFolder(folder string) bool {
for _, ignoredFolder := range cfg.IgnoredFolders {
if ignoredFolder.ID == folder {
return true
}
}
return false
}
func sortedObservedFolderSlice(input map[string]ObservedFolder) []ObservedFolder {
output := make([]ObservedFolder, 0, len(input))
for _, folder := range input {
output = append(output, folder)
}
sort.Slice(output, func(i, j int) bool {
return output[i].Time.Before(output[j].Time)
})
return output
}
func deduplicateObservedFoldersToMap(input []ObservedFolder) map[string]ObservedFolder {
output := make(map[string]ObservedFolder, len(input))
for _, folder := range input {
if existing, ok := output[folder.ID]; !ok || existing.Time.Before(folder.Time) {
output[folder.ID] = folder
}
}
return output
}
func (cfg *DeviceConfiguration) Description() string {
if cfg.Name == "" {
return cfg.DeviceID.Short().String()
}
return fmt.Sprintf("%s (%s)", cfg.Name, cfg.DeviceID.Short())
}