lib/config, lib/connections: Add optional connection limits (fixes #7176) (#7223)

This adds two new configuration options:

    // The number of connections at which we stop trying to connect to more
    // devices, zero meaning no limit. Does not affect incoming connections.
    ConnectionLimitEnough int

    // The maximum number of connections which we will allow in total, zero
    // meaning no limit. Affects incoming connections and prevents
    // attempting outgoing connections.
    ConnectionLimitMax int

These can be used to limit the number of concurrent connections in
various ways.
This commit is contained in:
Jakob Borg 2021-01-11 15:14:44 +01:00 committed by GitHub
parent e6f0ed65be
commit 0b193b76c2
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
13 changed files with 555 additions and 218 deletions

2
go.mod
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@ -17,7 +17,6 @@ require (
github.com/gobwas/glob v0.2.3
github.com/gogo/protobuf v1.3.1
github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e
github.com/golang/protobuf v1.4.3
github.com/greatroar/blobloom v0.5.0
github.com/jackpal/gateway v1.0.6
github.com/jackpal/go-nat-pmp v1.0.2
@ -46,6 +45,7 @@ require (
golang.org/x/sys v0.0.0-20201101102859-da207088b7d1
golang.org/x/text v0.3.4
golang.org/x/time v0.0.0-20200630173020-3af7569d3a1e
google.golang.org/protobuf v1.23.0
)
go 1.14

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@ -49,11 +49,15 @@ func (m *mockedModel) FolderProgressBytesCompleted(_ string) int64 {
return 0
}
func (m *mockedModel) NumConnections() int {
return 0
}
func (m *mockedModel) ConnectionStats() map[string]interface{} {
return nil
}
func (m *mockedModel) DeviceStatistics() (map[string]stats.DeviceStatistics, error) {
func (m *mockedModel) DeviceStatistics() (map[protocol.DeviceID]stats.DeviceStatistics, error) {
return nil, nil
}

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@ -7,9 +7,9 @@ import (
fmt "fmt"
proto "github.com/gogo/protobuf/proto"
github_com_gogo_protobuf_types "github.com/gogo/protobuf/types"
_ "github.com/golang/protobuf/ptypes/timestamp"
github_com_syncthing_syncthing_lib_protocol "github.com/syncthing/syncthing/lib/protocol"
_ "github.com/syncthing/syncthing/proto/ext"
_ "google.golang.org/protobuf/types/known/timestamppb"
io "io"
math "math"
math_bits "math/bits"

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@ -47,6 +47,14 @@ func (opts *OptionsConfiguration) prepare(guiPWIsSet bool) {
}
}
}
// Negative limits are meaningless, zero means unlimited.
if opts.ConnectionLimitEnough < 0 {
opts.ConnectionLimitEnough = 0
}
if opts.ConnectionLimitMax < 0 {
opts.ConnectionLimitMax = 0
}
}
// RequiresRestartOnly returns a copy with only the attributes that require
@ -178,3 +186,17 @@ func (opts OptionsConfiguration) FeatureFlag(name string) bool {
return false
}
// LowestConnectionLimit is the lower of ConnectionLimitEnough or
// ConnectionLimitMax, or whichever of them is actually set if only one of
// them is set. It's the point where we should stop dialling.
func (opts OptionsConfiguration) LowestConnectionLimit() int {
limit := opts.ConnectionLimitEnough
if limit == 0 || (opts.ConnectionLimitMax != 0 && opts.ConnectionLimitMax < limit) {
// It doesn't really make sense to set Max lower than Enough but
// someone might do it while experimenting and it's easy for us to
// do the right thing.
limit = opts.ConnectionLimitMax
}
return limit
}

View File

@ -74,6 +74,13 @@ type OptionsConfiguration struct {
AnnounceLANAddresses bool `protobuf:"varint,48,opt,name=announce_lan_addresses,json=announceLanAddresses,proto3" json:"announceLANAddresses" xml:"announceLANAddresses" default:"true"`
SendFullIndexOnUpgrade bool `protobuf:"varint,49,opt,name=send_full_index_on_upgrade,json=sendFullIndexOnUpgrade,proto3" json:"sendFullIndexOnUpgrade" xml:"sendFullIndexOnUpgrade"`
FeatureFlags []string `protobuf:"bytes,50,rep,name=feature_flags,json=featureFlags,proto3" json:"featureFlags" xml:"featureFlag"`
// The number of connections at which we stop trying to connect to more
// devices, zero meaning no limit. Does not affect incoming connections.
ConnectionLimitEnough int `protobuf:"varint,51,opt,name=connection_limit_enough,json=connectionLimitEnough,proto3,casttype=int" json:"connectionLimitEnough" xml:"connectionLimitEnough"`
// The maximum number of connections which we will allow in total, zero
// meaning no limit. Affects incoming connections and prevents
// attempting outgoing connections.
ConnectionLimitMax int `protobuf:"varint,52,opt,name=connection_limit_max,json=connectionLimitMax,proto3,casttype=int" json:"connectionLimitMax" xml:"connectionLimitMax"`
// Legacy deprecated
DeprecatedUPnPEnabled bool `protobuf:"varint,9000,opt,name=upnp_enabled,json=upnpEnabled,proto3" json:"-" xml:"upnpEnabled,omitempty"` // Deprecated: Do not use.
DeprecatedUPnPLeaseM int `protobuf:"varint,9001,opt,name=upnp_lease_m,json=upnpLeaseM,proto3,casttype=int" json:"-" xml:"upnpLeaseMinutes,omitempty"` // Deprecated: Do not use.
@ -126,204 +133,208 @@ func init() {
}
var fileDescriptor_d09882599506ca03 = []byte{
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0xaa, 0xbc, 0xb1, 0xae, 0xa0, 0x53, 0x42, 0x13, 0xed, 0x27, 0x4a, 0xdc, 0x7d, 0x72, 0x55, 0xff,
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0x00, 0xff, 0xff, 0x43, 0x37, 0xb7, 0x54, 0x10, 0x25, 0x00, 0x00,
}
func (m *OptionsConfiguration) Marshal() (dAtA []byte, err error) {
@ -419,6 +430,20 @@ func (m *OptionsConfiguration) MarshalToSizedBuffer(dAtA []byte) (int, error) {
i--
dAtA[i] = 0xc0
}
if m.ConnectionLimitMax != 0 {
i = encodeVarintOptionsconfiguration(dAtA, i, uint64(m.ConnectionLimitMax))
i--
dAtA[i] = 0x3
i--
dAtA[i] = 0xa0
}
if m.ConnectionLimitEnough != 0 {
i = encodeVarintOptionsconfiguration(dAtA, i, uint64(m.ConnectionLimitEnough))
i--
dAtA[i] = 0x3
i--
dAtA[i] = 0x98
}
if len(m.FeatureFlags) > 0 {
for iNdEx := len(m.FeatureFlags) - 1; iNdEx >= 0; iNdEx-- {
i -= len(m.FeatureFlags[iNdEx])
@ -1040,6 +1065,12 @@ func (m *OptionsConfiguration) ProtoSize() (n int) {
n += 2 + l + sovOptionsconfiguration(uint64(l))
}
}
if m.ConnectionLimitEnough != 0 {
n += 2 + sovOptionsconfiguration(uint64(m.ConnectionLimitEnough))
}
if m.ConnectionLimitMax != 0 {
n += 2 + sovOptionsconfiguration(uint64(m.ConnectionLimitMax))
}
if m.DeprecatedUPnPEnabled {
n += 4
}
@ -2218,6 +2249,44 @@ func (m *OptionsConfiguration) Unmarshal(dAtA []byte) error {
}
m.FeatureFlags = append(m.FeatureFlags, string(dAtA[iNdEx:postIndex]))
iNdEx = postIndex
case 51:
if wireType != 0 {
return fmt.Errorf("proto: wrong wireType = %d for field ConnectionLimitEnough", wireType)
}
m.ConnectionLimitEnough = 0
for shift := uint(0); ; shift += 7 {
if shift >= 64 {
return ErrIntOverflowOptionsconfiguration
}
if iNdEx >= l {
return io.ErrUnexpectedEOF
}
b := dAtA[iNdEx]
iNdEx++
m.ConnectionLimitEnough |= int(b&0x7F) << shift
if b < 0x80 {
break
}
}
case 52:
if wireType != 0 {
return fmt.Errorf("proto: wrong wireType = %d for field ConnectionLimitMax", wireType)
}
m.ConnectionLimitMax = 0
for shift := uint(0); ; shift += 7 {
if shift >= 64 {
return ErrIntOverflowOptionsconfiguration
}
if iNdEx >= l {
return io.ErrUnexpectedEOF
}
b := dAtA[iNdEx]
iNdEx++
m.ConnectionLimitMax |= int(b&0x7F) << shift
if b < 0x80 {
break
}
}
case 9000:
if wireType != 0 {
return fmt.Errorf("proto: wrong wireType = %d for field DeprecatedUPnPEnabled", wireType)

View File

@ -0,0 +1,54 @@
// Copyright (C) 2021 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 connections
import (
"sort"
"time"
"github.com/syncthing/syncthing/lib/protocol"
"github.com/syncthing/syncthing/lib/rand"
)
type dialQueueEntry struct {
id protocol.DeviceID
lastSeen time.Time
shortLived bool
targets []dialTarget
}
type dialQueue []dialQueueEntry
func (queue dialQueue) Sort() {
// Sort the queue with the most recently seen device at the head,
// increasing the likelihood of connecting to a device that we're
// already almost up to date with, index wise.
sort.Slice(queue, func(a, b int) bool {
qa, qb := queue[a], queue[b]
if qa.shortLived != qb.shortLived {
return qb.shortLived
}
return qa.lastSeen.After(qb.lastSeen)
})
// Shuffle the part of the connection queue that are devices we haven't
// connected to recently, so that if we only try a limited set of
// devices (or they in turn have limits and we're trying to load balance
// over several) and the usual ones are down it won't be the same ones
// in the same order every time.
idx := 0
cutoff := time.Now().Add(-recentlySeenCutoff)
for idx < len(queue) {
if queue[idx].lastSeen.Before(cutoff) {
break
}
idx++
}
if idx < len(queue)-1 {
rand.Shuffle(queue[idx:])
}
}

View File

@ -0,0 +1,119 @@
// Copyright (C) 2021 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 connections
import (
"reflect"
"testing"
"time"
"github.com/syncthing/syncthing/lib/protocol"
)
func TestDialQueueSort(t *testing.T) {
t.Parallel()
t.Run("ByLastSeen", func(t *testing.T) {
t.Parallel()
// Devices seen within the last week or so should be sorted stricly in order.
now := time.Now()
queue := dialQueue{
{id: device1, lastSeen: now.Add(-5 * time.Hour)}, // 1
{id: device2, lastSeen: now.Add(-50 * time.Hour)}, // 3
{id: device3, lastSeen: now.Add(-25 * time.Hour)}, // 2
{id: device4, lastSeen: now.Add(-2 * time.Hour)}, // 0
}
expected := []protocol.ShortID{device4.Short(), device1.Short(), device3.Short(), device2.Short()}
queue.Sort()
if !reflect.DeepEqual(shortDevices(queue), expected) {
t.Error("expected different order")
}
})
t.Run("OldConnections", func(t *testing.T) {
t.Parallel()
// Devices seen long ago should be randomized.
now := time.Now()
queue := dialQueue{
{id: device1, lastSeen: now.Add(-5 * time.Hour)}, // 1
{id: device2, lastSeen: now.Add(-50 * 24 * time.Hour)}, // 2, 3
{id: device3, lastSeen: now.Add(-25 * 24 * time.Hour)}, // 2, 3
{id: device4, lastSeen: now.Add(-2 * time.Hour)}, // 0
}
expected1 := []protocol.ShortID{device4.Short(), device1.Short(), device3.Short(), device2.Short()}
expected2 := []protocol.ShortID{device4.Short(), device1.Short(), device2.Short(), device3.Short()}
var seen1, seen2 int
for i := 0; i < 100; i++ {
queue.Sort()
res := shortDevices(queue)
if reflect.DeepEqual(res, expected1) {
seen1++
continue
}
if reflect.DeepEqual(res, expected2) {
seen2++
continue
}
t.Fatal("expected different order")
}
if seen1 < 10 || seen2 < 10 {
t.Error("expected more even distribution", seen1, seen2)
}
})
t.Run("ShortLivedConnections", func(t *testing.T) {
t.Parallel()
// Short lived connections should be sorted as if they were long ago
now := time.Now()
queue := dialQueue{
{id: device1, lastSeen: now.Add(-5 * time.Hour)}, // 1
{id: device2, lastSeen: now.Add(-3 * time.Hour)}, // 0
{id: device3, lastSeen: now.Add(-25 * 24 * time.Hour)}, // 2, 3
{id: device4, lastSeen: now.Add(-2 * time.Hour), shortLived: true}, // 2, 3
}
expected1 := []protocol.ShortID{device2.Short(), device1.Short(), device3.Short(), device4.Short()}
expected2 := []protocol.ShortID{device2.Short(), device1.Short(), device4.Short(), device3.Short()}
var seen1, seen2 int
for i := 0; i < 100; i++ {
queue.Sort()
res := shortDevices(queue)
if reflect.DeepEqual(res, expected1) {
seen1++
continue
}
if reflect.DeepEqual(res, expected2) {
seen2++
continue
}
t.Fatal("expected different order")
}
if seen1 < 10 || seen2 < 10 {
t.Error("expected more even distribution", seen1, seen2)
}
})
}
func shortDevices(queue dialQueue) []protocol.ShortID {
res := make([]protocol.ShortID, len(queue))
for i, qe := range queue {
res[i] = qe.id.Short()
}
return res
}

View File

@ -61,6 +61,8 @@ const (
minConnectionLoopSleep = 5 * time.Second
stdConnectionLoopSleep = time.Minute
worstDialerPriority = math.MaxInt32
recentlySeenCutoff = 7 * 24 * time.Hour
shortLivedConnectionThreshold = 5 * time.Second
)
// From go/src/crypto/tls/cipher_suites.go
@ -415,6 +417,24 @@ func (s *service) bestDialerPriority(cfg config.Configuration) int {
}
func (s *service) dialDevices(ctx context.Context, now time.Time, cfg config.Configuration, bestDialerPriority int, nextDialAt map[string]time.Time, initial bool) {
// Figure out current connection limits up front to see if there's any
// point in resolving devices and such at all.
allowAdditional := 0 // no limit
connectionLimit := cfg.Options.LowestConnectionLimit()
if connectionLimit > 0 {
current := s.model.NumConnections()
allowAdditional = connectionLimit - current
if allowAdditional <= 0 {
l.Debugf("Skipping dial because we've reached the connection limit, current %d >= limit %d", current, connectionLimit)
return
}
}
// Get device statistics for the last seen time of each device. This
// isn't critical, so ignore the potential error.
stats, _ := s.model.DeviceStatistics()
queue := make(dialQueue, 0, len(cfg.Devices))
for _, deviceCfg := range cfg.Devices {
// Don't attempt to connect to ourselves...
if deviceCfg.DeviceID == s.myID {
@ -440,8 +460,34 @@ func (s *service) dialDevices(ctx context.Context, now time.Time, cfg config.Con
}
dialTargets := s.resolveDialTargets(ctx, now, cfg, deviceCfg, nextDialAt, initial, priorityCutoff)
if conn, ok := s.dialParallel(ctx, deviceCfg.DeviceID, dialTargets); ok {
if len(dialTargets) > 0 {
queue = append(queue, dialQueueEntry{
id: deviceCfg.DeviceID,
lastSeen: stats[deviceCfg.DeviceID].LastSeen,
shortLived: stats[deviceCfg.DeviceID].LastConnectionDurationS < shortLivedConnectionThreshold.Seconds(),
targets: dialTargets,
})
}
}
// Sort the queue in an order we think will be useful (most recent
// first, deprioriting unstable devices, randomizing those we haven't
// seen in a long while). If we don't do connection limiting the sorting
// doesn't have much effect, but it may result in getting up and running
// quicker if only a subset of configured devices are actually reachable
// (by prioritizing those that were reachable recently).
dialQueue.Sort(queue)
// Perform dials according to the queue, stopping when we've reached the
// allowed additional number of connections (if limited).
numConns := 0
for _, entry := range queue {
if conn, ok := s.dialParallel(ctx, entry.id, entry.targets); ok {
s.conns <- conn
numConns++
if allowAdditional > 0 && numConns >= allowAdditional {
break
}
}
}
}

View File

@ -18,6 +18,7 @@ import (
"github.com/syncthing/syncthing/lib/config"
"github.com/syncthing/syncthing/lib/nat"
"github.com/syncthing/syncthing/lib/protocol"
"github.com/syncthing/syncthing/lib/stats"
"github.com/thejerf/suture/v4"
)
@ -193,9 +194,11 @@ type genericListener interface {
type Model interface {
protocol.Model
AddConnection(conn protocol.Connection, hello protocol.Hello)
NumConnections() int
Connection(remoteID protocol.DeviceID) (protocol.Connection, bool)
OnHello(protocol.DeviceID, net.Addr, protocol.Hello) error
GetHello(protocol.DeviceID) protocol.HelloIntf
DeviceStatistics() (map[protocol.DeviceID]stats.DeviceStatistics, error)
}
type onAddressesChangedNotifier struct {

View File

@ -8,10 +8,10 @@ import (
_ "github.com/gogo/protobuf/gogoproto"
proto "github.com/gogo/protobuf/proto"
github_com_gogo_protobuf_types "github.com/gogo/protobuf/types"
_ "github.com/golang/protobuf/ptypes/timestamp"
github_com_syncthing_syncthing_lib_protocol "github.com/syncthing/syncthing/lib/protocol"
protocol "github.com/syncthing/syncthing/lib/protocol"
_ "github.com/syncthing/syncthing/proto/ext"
_ "google.golang.org/protobuf/types/known/timestamppb"
io "io"
math "math"
math_bits "math/bits"

View File

@ -101,7 +101,7 @@ type Model interface {
Completion(device protocol.DeviceID, folder string) FolderCompletion
ConnectionStats() map[string]interface{}
DeviceStatistics() (map[string]stats.DeviceStatistics, error)
DeviceStatistics() (map[protocol.DeviceID]stats.DeviceStatistics, error)
FolderStatistics() (map[string]stats.FolderStatistics, error)
UsageReportingStats(report *contract.Report, version int, preview bool)
@ -193,6 +193,7 @@ var (
errEncryptionReceivedToken = errors.New("resetting connection to send info on new encrypted folder (new cluster config)")
errMissingRemoteInClusterConfig = errors.New("remote device missing in cluster config")
errMissingLocalInClusterConfig = errors.New("local device missing in cluster config")
errConnLimitReached = errors.New("connection limit reached")
)
// NewModel creates and starts a new model. The model starts in read-only mode,
@ -727,6 +728,13 @@ func (info ConnectionInfo) MarshalJSON() ([]byte, error) {
})
}
// NumConnections returns the current number of active connected devices.
func (m *model) NumConnections() int {
m.pmut.RLock()
defer m.pmut.RUnlock()
return len(m.conn)
}
// ConnectionStats returns a map with connection statistics for each device.
func (m *model) ConnectionStats() map[string]interface{} {
m.pmut.RLock()
@ -773,16 +781,16 @@ func (m *model) ConnectionStats() map[string]interface{} {
}
// DeviceStatistics returns statistics about each device
func (m *model) DeviceStatistics() (map[string]stats.DeviceStatistics, error) {
func (m *model) DeviceStatistics() (map[protocol.DeviceID]stats.DeviceStatistics, error) {
m.fmut.RLock()
defer m.fmut.RUnlock()
res := make(map[string]stats.DeviceStatistics, len(m.deviceStatRefs))
res := make(map[protocol.DeviceID]stats.DeviceStatistics, len(m.deviceStatRefs))
for id, sr := range m.deviceStatRefs {
stats, err := sr.GetStatistics()
if err != nil {
return nil, err
}
res[id.String()] = stats
res[id] = stats
}
return res, nil
}
@ -2049,10 +2057,14 @@ func (m *model) OnHello(remoteID protocol.DeviceID, addr net.Addr, hello protoco
return errDevicePaused
}
if len(cfg.AllowedNetworks) > 0 {
if !connections.IsAllowedNetwork(addr.String(), cfg.AllowedNetworks) {
if len(cfg.AllowedNetworks) > 0 && !connections.IsAllowedNetwork(addr.String(), cfg.AllowedNetworks) {
// The connection is not from an allowed network.
return errNetworkNotAllowed
}
if max := m.cfg.Options().ConnectionLimitMax; max > 0 && m.NumConnections() >= max {
// We're not allowed to accept any more connections.
return errConnLimitReached
}
return nil

View File

@ -3407,7 +3407,7 @@ func TestDeviceWasSeen(t *testing.T) {
if err != nil {
t.Error("Unexpected error:", err)
}
entry := stats[device1.String()]
entry := stats[device1]
if time.Since(entry.LastSeen) > time.Second {
t.Error("device should have been seen now")
}

View File

@ -58,6 +58,14 @@ message OptionsConfiguration {
bool send_full_index_on_upgrade = 49;
repeated string feature_flags = 50;
// The number of connections at which we stop trying to connect to more
// devices, zero meaning no limit. Does not affect incoming connections.
int32 connection_limit_enough = 51;
// The maximum number of connections which we will allow in total, zero
// meaning no limit. Affects incoming connections and prevents
// attempting outgoing connections.
int32 connection_limit_max = 52;
// Legacy deprecated
bool upnp_enabled = 9000 [deprecated = true, (ext.goname) = "DeprecatedUPnPEnabled"];