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lib/model: Clean up index handler life cycle (fixes #9021) (#9038)

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Co-authored-by: Simon Frei <freisim93@gmail.com>
This commit is contained in:
Jakob Borg 2023-08-21 18:39:13 +02:00 committed by GitHub
parent c2c6133aa5
commit 40b3b9ad15
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 300 additions and 61 deletions
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4
lib/model/fakeconns_test.go
View File

@ -14,6 +14,7 @@ import (
"github.com/syncthing/syncthing/lib/protocol"
protocolmocks "github.com/syncthing/syncthing/lib/protocol/mocks"
"github.com/syncthing/syncthing/lib/rand"
"github.com/syncthing/syncthing/lib/scanner"
)
@ -36,10 +37,11 @@ func newFakeConnection(id protocol.DeviceID, model Model) *fakeConnection {
f.CloseCalls(func(err error) {
f.closeOnce.Do(func() {
close(f.closed)
model.Closed(f, err)
})
model.Closed(f, err)
f.ClosedReturns(f.closed)
})
f.StringReturns(rand.String(8))
return f
}

62
lib/model/indexhandler.go
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@ -12,8 +12,6 @@ import (
"sync"
"time"
"github.com/thejerf/suture/v4"
"github.com/syncthing/syncthing/lib/config"
"github.com/syncthing/syncthing/lib/db"
"github.com/syncthing/syncthing/lib/events"
@ -28,7 +26,6 @@ type indexHandler struct {
folderIsReceiveEncrypted bool
prevSequence int64
evLogger events.Logger
token suture.ServiceToken
cond *sync.Cond
paused bool
@ -373,11 +370,10 @@ func (s *indexHandler) String() string {
}
type indexHandlerRegistry struct {
sup *suture.Supervisor
evLogger events.Logger
conn protocol.Connection
downloads *deviceDownloadState
indexHandlers map[string]*indexHandler
indexHandlers *serviceMap[string, *indexHandler]
startInfos map[string]*clusterConfigDeviceInfo
folderStates map[string]*indexHandlerFolderState
mut sync.Mutex
@ -389,27 +385,16 @@ type indexHandlerFolderState struct {
runner service
}
func newIndexHandlerRegistry(conn protocol.Connection, downloads *deviceDownloadState, closed chan struct{}, parentSup *suture.Supervisor, evLogger events.Logger) *indexHandlerRegistry {
func newIndexHandlerRegistry(conn protocol.Connection, downloads *deviceDownloadState, evLogger events.Logger) *indexHandlerRegistry {
r := &indexHandlerRegistry{
evLogger: evLogger,
conn: conn,
downloads: downloads,
evLogger: evLogger,
indexHandlers: make(map[string]*indexHandler),
indexHandlers: newServiceMap[string, *indexHandler](evLogger),
startInfos: make(map[string]*clusterConfigDeviceInfo),
folderStates: make(map[string]*indexHandlerFolderState),
mut: sync.Mutex{},
}
r.sup = suture.New(r.String(), svcutil.SpecWithDebugLogger(l))
ourToken := parentSup.Add(r.sup)
r.sup.Add(svcutil.AsService(func(ctx context.Context) error {
select {
case <-ctx.Done():
return ctx.Err()
case <-closed:
parentSup.Remove(ourToken)
}
return nil
}, fmt.Sprintf("%v/waitForClosed", r)))
return r
}
@ -417,20 +402,18 @@ func (r *indexHandlerRegistry) String() string {
return fmt.Sprintf("indexHandlerRegistry/%v", r.conn.DeviceID().Short())
}
func (r *indexHandlerRegistry) GetSupervisor() *suture.Supervisor {
return r.sup
func (r *indexHandlerRegistry) Serve(ctx context.Context) error {
// Running the index handler registry means running the individual index
// handler children.
return r.indexHandlers.Serve(ctx)
}
func (r *indexHandlerRegistry) startLocked(folder config.FolderConfiguration, fset *db.FileSet, runner service, startInfo *clusterConfigDeviceInfo) {
if is, ok := r.indexHandlers[folder.ID]; ok {
r.sup.RemoveAndWait(is.token, 0)
delete(r.indexHandlers, folder.ID)
}
r.indexHandlers.RemoveAndWait(folder.ID, 0)
delete(r.startInfos, folder.ID)
is := newIndexHandler(r.conn, r.downloads, folder, fset, runner, startInfo, r.evLogger)
is.token = r.sup.Add(is)
r.indexHandlers[folder.ID] = is
r.indexHandlers.Add(folder.ID, is)
// This new connection might help us get in sync.
runner.SchedulePull()
@ -444,9 +427,7 @@ func (r *indexHandlerRegistry) AddIndexInfo(folder string, startInfo *clusterCon
r.mut.Lock()
defer r.mut.Unlock()
if is, ok := r.indexHandlers[folder]; ok {
r.sup.RemoveAndWait(is.token, 0)
delete(r.indexHandlers, folder)
if r.indexHandlers.RemoveAndWait(folder, 0) {
l.Debugf("Removed index sender for device %v and folder %v due to added pending", r.conn.DeviceID().Short(), folder)
}
folderState, ok := r.folderStates[folder]
@ -465,10 +446,7 @@ func (r *indexHandlerRegistry) Remove(folder string) {
defer r.mut.Unlock()
l.Debugf("Removing index handler for device %v and folder %v", r.conn.DeviceID().Short(), folder)
if is, ok := r.indexHandlers[folder]; ok {
r.sup.RemoveAndWait(is.token, 0)
delete(r.indexHandlers, folder)
}
r.indexHandlers.RemoveAndWait(folder, 0)
delete(r.startInfos, folder)
l.Debugf("Removed index handler for device %v and folder %v", r.conn.DeviceID().Short(), folder)
}
@ -480,13 +458,12 @@ func (r *indexHandlerRegistry) RemoveAllExcept(except map[string]remoteFolderSta
r.mut.Lock()
defer r.mut.Unlock()
for folder, is := range r.indexHandlers {
r.indexHandlers.Each(func(folder string, is *indexHandler) {
if _, ok := except[folder]; !ok {
r.sup.RemoveAndWait(is.token, 0)
delete(r.indexHandlers, folder)
r.indexHandlers.RemoveAndWait(folder, 0)
l.Debugf("Removed index handler for device %v and folder %v (removeAllExcept)", r.conn.DeviceID().Short(), folder)
}
}
})
for folder := range r.startInfos {
if _, ok := except[folder]; !ok {
delete(r.startInfos, folder)
@ -518,7 +495,7 @@ func (r *indexHandlerRegistry) RegisterFolderState(folder config.FolderConfigura
func (r *indexHandlerRegistry) folderPausedLocked(folder string) {
l.Debugf("Pausing index handler for device %v and folder %v", r.conn.DeviceID().Short(), folder)
delete(r.folderStates, folder)
if is, ok := r.indexHandlers[folder]; ok {
if is, ok := r.indexHandlers.Get(folder); ok {
is.pause()
l.Debugf("Paused index handler for device %v and folder %v", r.conn.DeviceID().Short(), folder)
} else {
@ -536,11 +513,10 @@ func (r *indexHandlerRegistry) folderRunningLocked(folder config.FolderConfigura
runner: runner,
}
is, isOk := r.indexHandlers[folder.ID]
is, isOk := r.indexHandlers.Get(folder.ID)
if info, ok := r.startInfos[folder.ID]; ok {
if isOk {
r.sup.RemoveAndWait(is.token, 0)
delete(r.indexHandlers, folder.ID)
r.indexHandlers.RemoveAndWait(folder.ID, 0)
l.Debugf("Removed index handler for device %v and folder %v in resume", r.conn.DeviceID().Short(), folder.ID)
}
r.startLocked(folder, fset, runner, info)
@ -557,7 +533,7 @@ func (r *indexHandlerRegistry) folderRunningLocked(folder config.FolderConfigura
func (r *indexHandlerRegistry) ReceiveIndex(folder string, fs []protocol.FileInfo, update bool, op string) error {
r.mut.Lock()
defer r.mut.Unlock()
is, isOk := r.indexHandlers[folder]
is, isOk := r.indexHandlers.Get(folder)
if !isOk {
l.Infof("%v for nonexistent or paused folder %q", op, folder)
return fmt.Errorf("%s: %w", folder, ErrFolderMissing)

31
lib/model/model.go
View File

@ -165,7 +165,7 @@ type model struct {
helloMessages map[protocol.DeviceID]protocol.Hello
deviceDownloads map[protocol.DeviceID]*deviceDownloadState
remoteFolderStates map[protocol.DeviceID]map[string]remoteFolderState // deviceID -> folders
indexHandlers map[protocol.DeviceID]*indexHandlerRegistry
indexHandlers *serviceMap[protocol.DeviceID, *indexHandlerRegistry]
// for testing only
foldersRunning atomic.Int32
@ -248,12 +248,13 @@ func NewModel(cfg config.Wrapper, id protocol.DeviceID, clientName, clientVersio
helloMessages: make(map[protocol.DeviceID]protocol.Hello),
deviceDownloads: make(map[protocol.DeviceID]*deviceDownloadState),
remoteFolderStates: make(map[protocol.DeviceID]map[string]remoteFolderState),
indexHandlers: make(map[protocol.DeviceID]*indexHandlerRegistry),
indexHandlers: newServiceMap[protocol.DeviceID, *indexHandlerRegistry](evLogger),
}
for devID := range cfg.Devices() {
m.deviceStatRefs[devID] = stats.NewDeviceStatisticsReference(m.db, devID)
}
m.Add(m.progressEmitter)
m.Add(m.indexHandlers)
m.Add(svcutil.AsService(m.serve, m.String()))
return m
@ -487,9 +488,9 @@ func (m *model) removeFolder(cfg config.FolderConfiguration) {
}
m.cleanupFolderLocked(cfg)
for _, r := range m.indexHandlers {
m.indexHandlers.Each(func(_ protocol.DeviceID, r *indexHandlerRegistry) {
r.Remove(cfg.ID)
}
})
m.fmut.Unlock()
m.pmut.RUnlock()
@ -563,9 +564,9 @@ func (m *model) restartFolder(from, to config.FolderConfiguration, cacheIgnoredF
// Care needs to be taken because we already hold fmut and the lock order
// must be the same everywhere. As fmut is acquired first, this is fine.
m.pmut.RLock()
for _, indexRegistry := range m.indexHandlers {
indexRegistry.RegisterFolderState(to, fset, m.folderRunners[to.ID])
}
m.indexHandlers.Each(func(_ protocol.DeviceID, r *indexHandlerRegistry) {
r.RegisterFolderState(to, fset, m.folderRunners[to.ID])
})
m.pmut.RUnlock()
var infoMsg string
@ -601,9 +602,9 @@ func (m *model) newFolder(cfg config.FolderConfiguration, cacheIgnoredFiles bool
// Care needs to be taken because we already hold fmut and the lock order
// must be the same everywhere. As fmut is acquired first, this is fine.
m.pmut.RLock()
for _, indexRegistry := range m.indexHandlers {
indexRegistry.RegisterFolderState(cfg, fset, m.folderRunners[cfg.ID])
}
m.indexHandlers.Each(func(_ protocol.DeviceID, r *indexHandlerRegistry) {
r.RegisterFolderState(cfg, fset, m.folderRunners[cfg.ID])
})
m.pmut.RUnlock()
return nil
@ -1138,7 +1139,7 @@ func (m *model) handleIndex(conn protocol.Connection, folder string, fs []protoc
}
m.pmut.RLock()
indexHandler, ok := m.indexHandlers[deviceID]
indexHandler, ok := m.indexHandlers.Get(deviceID)
m.pmut.RUnlock()
if !ok {
// This should be impossible, as an index handler always exists for an
@ -1170,7 +1171,7 @@ func (m *model) ClusterConfig(conn protocol.Connection, cm protocol.ClusterConfi
l.Debugf("Handling ClusterConfig from %v", deviceID.Short())
m.pmut.RLock()
indexHandlerRegistry, ok := m.indexHandlers[deviceID]
indexHandlerRegistry, ok := m.indexHandlers.Get(deviceID)
m.pmut.RUnlock()
if !ok {
panic("bug: ClusterConfig called on closed or nonexistent connection")
@ -1792,7 +1793,7 @@ func (m *model) Closed(conn protocol.Connection, err error) {
delete(m.remoteFolderStates, device)
closed := m.closed[device]
delete(m.closed, device)
delete(m.indexHandlers, device)
m.indexHandlers.RemoveAndWait(device, 0)
m.pmut.Unlock()
m.progressEmitter.temporaryIndexUnsubscribe(conn)
@ -2251,11 +2252,11 @@ func (m *model) AddConnection(conn protocol.Connection, hello protocol.Hello) {
closed := make(chan struct{})
m.closed[deviceID] = closed
m.deviceDownloads[deviceID] = newDeviceDownloadState()
indexRegistry := newIndexHandlerRegistry(conn, m.deviceDownloads[deviceID], closed, m.Supervisor, m.evLogger)
indexRegistry := newIndexHandlerRegistry(conn, m.deviceDownloads[deviceID], m.evLogger)
for id, fcfg := range m.folderCfgs {
indexRegistry.RegisterFolderState(fcfg, m.folderFiles[id], m.folderRunners[id])
}
m.indexHandlers[deviceID] = indexRegistry
m.indexHandlers.Add(deviceID, indexRegistry)
m.fmut.RUnlock()
// 0: default, <0: no limiting
switch {

5
lib/model/model_test.go
View File

@ -1337,8 +1337,9 @@ func TestAutoAcceptEnc(t *testing.T) {
// Earlier tests might cause the connection to get closed, thus ClusterConfig
// would panic.
clusterConfig := func(deviceID protocol.DeviceID, cm protocol.ClusterConfig) {
m.AddConnection(newFakeConnection(deviceID, m), protocol.Hello{})
m.ClusterConfig(&protocolmocks.Connection{DeviceIDStub: func() protocol.DeviceID { return deviceID }}, cm)
conn := newFakeConnection(deviceID, m)
m.AddConnection(conn, protocol.Hello{})
m.ClusterConfig(conn, cm)
}
clusterConfig(device1, basicCC())

103
lib/model/service_map.go Normal file
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@ -0,0 +1,103 @@
// Copyright (C) 2023 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 model
import (
"context"
"fmt"
"time"
"github.com/syncthing/syncthing/lib/events"
"github.com/syncthing/syncthing/lib/svcutil"
"github.com/thejerf/suture/v4"
)
// A serviceMap is a utility map of arbitrary keys to a suture.Service of
// some kind, where adding and removing services ensures they are properly
// started and stopped on the given Supervisor. The serviceMap is itself a
// suture.Service and should be added to a Supervisor.
// Not safe for concurrent use.
type serviceMap[K comparable, S suture.Service] struct {
services map[K]S
tokens map[K]suture.ServiceToken
supervisor *suture.Supervisor
eventLogger events.Logger
}
func newServiceMap[K comparable, S suture.Service](eventLogger events.Logger) *serviceMap[K, S] {
m := &serviceMap[K, S]{
services: make(map[K]S),
tokens: make(map[K]suture.ServiceToken),
eventLogger: eventLogger,
}
m.supervisor = suture.New(m.String(), svcutil.SpecWithDebugLogger(l))
return m
}
// Add adds a service to the map, starting it on the supervisor. If there is
// already a service at the given key, it is removed first.
func (s *serviceMap[K, S]) Add(k K, v S) {
if tok, ok := s.tokens[k]; ok {
// There is already a service at this key, remove it first.
s.supervisor.Remove(tok)
s.eventLogger.Log(events.Failure, fmt.Sprintf("%s replaced service at key %v", s, k))
}
s.services[k] = v
s.tokens[k] = s.supervisor.Add(v)
}
// Get returns the service at the given key, or the empty value and false if
// there is no service at that key.
func (s *serviceMap[K, S]) Get(k K) (v S, ok bool) {
v, ok = s.services[k]
return
}
// Remove removes the service at the given key, stopping it on the supervisor.
// If there is no service at the given key, nothing happens. The return value
// indicates whether a service was removed.
func (s *serviceMap[K, S]) Remove(k K) (found bool) {
if tok, ok := s.tokens[k]; ok {
found = true
s.supervisor.Remove(tok)
}
delete(s.services, k)
delete(s.tokens, k)
return
}
// RemoveAndWait removes the service at the given key, stopping it on the
// supervisor. If there is no service at the given key, nothing happens. The
// return value indicates whether a service was removed.
func (s *serviceMap[K, S]) RemoveAndWait(k K, timeout time.Duration) (found bool) {
if tok, ok := s.tokens[k]; ok {
found = true
s.supervisor.RemoveAndWait(tok, timeout)
}
delete(s.services, k)
delete(s.tokens, k)
return found
}
// Each calls the given function for each service in the map.
func (s *serviceMap[K, S]) Each(fn func(K, S)) {
for key, svc := range s.services {
fn(key, svc)
}
}
// Suture implementation
func (s *serviceMap[K, S]) Serve(ctx context.Context) error {
return s.supervisor.Serve(ctx)
}
func (s *serviceMap[K, S]) String() string {
var kv K
var sv S
return fmt.Sprintf("serviceMap[%T, %T]@%p", kv, sv, s)
}

156
lib/model/service_map_test.go Normal file
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@ -0,0 +1,156 @@
// Copyright (C) 2023 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 model
import (
"context"
"strings"
"testing"
"github.com/syncthing/syncthing/lib/events"
"github.com/thejerf/suture/v4"
)
func TestServiceMap(t *testing.T) {
t.Parallel()
ctx, cancel := context.WithCancel(context.Background())
t.Cleanup(cancel)
sup := suture.NewSimple("TestServiceMap")
sup.ServeBackground(ctx)
t.Run("SimpleAddRemove", func(t *testing.T) {
t.Parallel()
sm := newServiceMap[string, *dummyService](events.NoopLogger)
sup.Add(sm)
// Add two services. They should start.
d1 := newDummyService()
d2 := newDummyService()
sm.Add("d1", d1)
sm.Add("d2", d2)
<-d1.started
<-d2.started
// Remove them. They should stop.
if !sm.Remove("d1") {
t.Errorf("Remove failed")
}
if !sm.Remove("d2") {
t.Errorf("Remove failed")
}
<-d1.stopped
<-d2.stopped
})
t.Run("OverwriteImpliesRemove", func(t *testing.T) {
t.Parallel()
sm := newServiceMap[string, *dummyService](events.NoopLogger)
sup.Add(sm)
d1 := newDummyService()
d2 := newDummyService()
// Add d1, it should start.
sm.Add("k", d1)
<-d1.started
// Add d2, with the same key. The previous one should stop as we're
// doing a replace.
sm.Add("k", d2)
<-d1.stopped
<-d2.started
if !sm.Remove("k") {
t.Errorf("Remove failed")
}
<-d2.stopped
})
t.Run("IterateWithRemoveAndWait", func(t *testing.T) {
t.Parallel()
sm := newServiceMap[string, *dummyService](events.NoopLogger)
sup.Add(sm)
// Add four services.
d1 := newDummyService()
d2 := newDummyService()
d3 := newDummyService()
d4 := newDummyService()
sm.Add("keep1", d1)
sm.Add("remove2", d2)
sm.Add("keep3", d3)
sm.Add("remove4", d4)
<-d1.started
<-d2.started
<-d3.started
<-d4.started
// Remove two of them from within the iterator.
sm.Each(func(k string, v *dummyService) {
if strings.HasPrefix(k, "remove") {
sm.RemoveAndWait(k, 0)
}
})
// They should have stopped.
<-d2.stopped
<-d4.stopped
// They should not be in the map anymore.
if _, ok := sm.Get("remove2"); ok {
t.Errorf("Service still in map")
}
if _, ok := sm.Get("remove4"); ok {
t.Errorf("Service still in map")
}
// The other two should still be running.
if _, ok := sm.Get("keep1"); !ok {
t.Errorf("Service not in map")
}
if _, ok := sm.Get("keep3"); !ok {
t.Errorf("Service not in map")
}
})
}
type dummyService struct {
started chan struct{}
stopped chan struct{}
}
func newDummyService() *dummyService {
return &dummyService{
started: make(chan struct{}),
stopped: make(chan struct{}),
}
}
func (d *dummyService) Serve(ctx context.Context) error {
close(d.started)
defer close(d.stopped)
<-ctx.Done()
return nil
}