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lib/model, lib/protocol: Use error handling to avoid panic on non-started folder (fixes #6174) (#6212)

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This adds error returns to model methods called by the protocol layer.
Returning an error will cause the connection to be torn down as the
message couldn't be handled. Using this to signal that a folder isn't
currently available will then cause a reconnection a few moments later,
when it'll hopefully work better.

Tested manually by running with STRECHECKDBEVERY=0 on a nontrivially
sized setup. This panics reliably before this patch, but just causes a
disconnect/reconnect now.
This commit is contained in:
Jakob Borg 2019-12-04 10:46:55 +01:00 committed by GitHub
parent 6fd5e78740
commit be0508cf26
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 76 additions and 51 deletions
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20
lib/api/mocked_model_test.go
View File

@ -152,21 +152,29 @@ func (m *mockedModel) LocalChangedFiles(folder string, page, perpage int) []db.F
return nil return nil
} }
func (m *mockedModel) Serve() {} func (m *mockedModel) Serve() {}
func (m *mockedModel) Stop() {} func (m *mockedModel) Stop() {}
func (m *mockedModel) Index(deviceID protocol.DeviceID, folder string, files []protocol.FileInfo) {}
func (m *mockedModel) IndexUpdate(deviceID protocol.DeviceID, folder string, files []protocol.FileInfo) { func (m *mockedModel) Index(deviceID protocol.DeviceID, folder string, files []protocol.FileInfo) error {
return nil
}
func (m *mockedModel) IndexUpdate(deviceID protocol.DeviceID, folder string, files []protocol.FileInfo) error {
return nil
} }
func (m *mockedModel) Request(deviceID protocol.DeviceID, folder, name string, size int32, offset int64, hash []byte, weakHash uint32, fromTemporary bool) (protocol.RequestResponse, error) { func (m *mockedModel) Request(deviceID protocol.DeviceID, folder, name string, size int32, offset int64, hash []byte, weakHash uint32, fromTemporary bool) (protocol.RequestResponse, error) {
return nil, nil return nil, nil
} }
func (m *mockedModel) ClusterConfig(deviceID protocol.DeviceID, config protocol.ClusterConfig) {} func (m *mockedModel) ClusterConfig(deviceID protocol.DeviceID, config protocol.ClusterConfig) error {
return nil
}
func (m *mockedModel) Closed(conn protocol.Connection, err error) {} func (m *mockedModel) Closed(conn protocol.Connection, err error) {}
func (m *mockedModel) DownloadProgress(deviceID protocol.DeviceID, folder string, updates []protocol.FileDownloadProgressUpdate) { func (m *mockedModel) DownloadProgress(deviceID protocol.DeviceID, folder string, updates []protocol.FileDownloadProgressUpdate) error {
return nil
} }
func (m *mockedModel) AddConnection(conn connections.Connection, hello protocol.HelloResult) {} func (m *mockedModel) AddConnection(conn connections.Connection, hello protocol.HelloResult) {}

35
lib/model/model.go
View File

@ -1039,17 +1039,17 @@ func (m *model) RemoteNeedFolderFiles(device protocol.DeviceID, folder string, p
// Index is called when a new device is connected and we receive their full index. // Index is called when a new device is connected and we receive their full index.
// Implements the protocol.Model interface. // Implements the protocol.Model interface.
func (m *model) Index(deviceID protocol.DeviceID, folder string, fs []protocol.FileInfo) { func (m *model) Index(deviceID protocol.DeviceID, folder string, fs []protocol.FileInfo) error {
m.handleIndex(deviceID, folder, fs, false) return m.handleIndex(deviceID, folder, fs, false)
} }
// IndexUpdate is called for incremental updates to connected devices' indexes. // IndexUpdate is called for incremental updates to connected devices' indexes.
// Implements the protocol.Model interface. // Implements the protocol.Model interface.
func (m *model) IndexUpdate(deviceID protocol.DeviceID, folder string, fs []protocol.FileInfo) { func (m *model) IndexUpdate(deviceID protocol.DeviceID, folder string, fs []protocol.FileInfo) error {
m.handleIndex(deviceID, folder, fs, true) return m.handleIndex(deviceID, folder, fs, true)
} }
func (m *model) handleIndex(deviceID protocol.DeviceID, folder string, fs []protocol.FileInfo, update bool) { func (m *model) handleIndex(deviceID protocol.DeviceID, folder string, fs []protocol.FileInfo, update bool) error {
op := "Index" op := "Index"
if update { if update {
op += " update" op += " update"
@ -1059,10 +1059,10 @@ func (m *model) handleIndex(deviceID protocol.DeviceID, folder string, fs []prot
if cfg, ok := m.cfg.Folder(folder); !ok || !cfg.SharedWith(deviceID) { if cfg, ok := m.cfg.Folder(folder); !ok || !cfg.SharedWith(deviceID) {
l.Infof("%v for unexpected folder ID %q sent from device %q; ensure that the folder exists and that this device is selected under \"Share With\" in the folder configuration.", op, folder, deviceID) l.Infof("%v for unexpected folder ID %q sent from device %q; ensure that the folder exists and that this device is selected under \"Share With\" in the folder configuration.", op, folder, deviceID)
return return errors.Wrap(errFolderMissing, folder)
} else if cfg.Paused { } else if cfg.Paused {
l.Debugf("%v for paused folder (ID %q) sent from device %q.", op, folder, deviceID) l.Debugf("%v for paused folder (ID %q) sent from device %q.", op, folder, deviceID)
return return errors.Wrap(ErrFolderPaused, folder)
} }
m.fmut.RLock() m.fmut.RLock()
@ -1071,17 +1071,12 @@ func (m *model) handleIndex(deviceID protocol.DeviceID, folder string, fs []prot
m.fmut.RUnlock() m.fmut.RUnlock()
if !existing { if !existing {
l.Warnf("%v for nonexistent folder %q", op, folder) l.Infof("%v for nonexistent folder %q", op, folder)
panic("handling index for nonexistent folder") return errors.Wrap(errFolderMissing, folder)
} }
if running { if running {
defer runner.SchedulePull() defer runner.SchedulePull()
} else if update {
// Runner may legitimately not be set if this is the "cleanup" Index
// message at startup.
l.Warnf("%v for not running folder %q", op, folder)
panic("handling index for not running folder")
} }
m.pmut.RLock() m.pmut.RLock()
@ -1105,9 +1100,11 @@ func (m *model) handleIndex(deviceID protocol.DeviceID, folder string, fs []prot
"items": len(fs), "items": len(fs),
"version": files.Sequence(deviceID), "version": files.Sequence(deviceID),
}) })
return nil
} }
func (m *model) ClusterConfig(deviceID protocol.DeviceID, cm protocol.ClusterConfig) { func (m *model) ClusterConfig(deviceID protocol.DeviceID, cm protocol.ClusterConfig) error {
// Check the peer device's announced folders against our own. Emits events // Check the peer device's announced folders against our own. Emits events
// for folders that we don't expect (unknown or not shared). // for folders that we don't expect (unknown or not shared).
// Also, collect a list of folders we do share, and if he's interested in // Also, collect a list of folders we do share, and if he's interested in
@ -1305,6 +1302,8 @@ func (m *model) ClusterConfig(deviceID protocol.DeviceID, cm protocol.ClusterCon
l.Warnln("Failed to save config", err) l.Warnln("Failed to save config", err)
} }
} }
return nil
} }
// handleIntroductions handles adding devices/folders that are shared by an introducer device // handleIntroductions handles adding devices/folders that are shared by an introducer device
@ -1961,13 +1960,13 @@ func (m *model) AddConnection(conn connections.Connection, hello protocol.HelloR
m.deviceWasSeen(deviceID) m.deviceWasSeen(deviceID)
} }
func (m *model) DownloadProgress(device protocol.DeviceID, folder string, updates []protocol.FileDownloadProgressUpdate) { func (m *model) DownloadProgress(device protocol.DeviceID, folder string, updates []protocol.FileDownloadProgressUpdate) error {
m.fmut.RLock() m.fmut.RLock()
cfg, ok := m.folderCfgs[folder] cfg, ok := m.folderCfgs[folder]
m.fmut.RUnlock() m.fmut.RUnlock()
if !ok || cfg.DisableTempIndexes || !cfg.SharedWith(device) { if !ok || cfg.DisableTempIndexes || !cfg.SharedWith(device) {
return return nil
} }
m.pmut.RLock() m.pmut.RLock()
@ -1981,6 +1980,8 @@ func (m *model) DownloadProgress(device protocol.DeviceID, folder string, update
"folder": folder, "folder": folder,
"state": state, "state": state,
}) })
return nil
} }
func (m *model) deviceWasSeen(deviceID protocol.DeviceID) { func (m *model) deviceWasSeen(deviceID protocol.DeviceID) {

12
lib/protocol/benchmark_test.go
View File

@ -166,10 +166,12 @@ func negotiateTLS(cert tls.Certificate, conn0, conn1 net.Conn) (net.Conn, net.Co
type fakeModel struct{} type fakeModel struct{}
func (m *fakeModel) Index(deviceID DeviceID, folder string, files []FileInfo) { func (m *fakeModel) Index(deviceID DeviceID, folder string, files []FileInfo) error {
return nil
} }
func (m *fakeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) { func (m *fakeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) error {
return nil
} }
func (m *fakeModel) Request(deviceID DeviceID, folder, name string, size int32, offset int64, hash []byte, weakHash uint32, fromTemporary bool) (RequestResponse, error) { func (m *fakeModel) Request(deviceID DeviceID, folder, name string, size int32, offset int64, hash []byte, weakHash uint32, fromTemporary bool) (RequestResponse, error) {
@ -181,11 +183,13 @@ func (m *fakeModel) Request(deviceID DeviceID, folder, name string, size int32,
return &fakeRequestResponse{buf}, nil return &fakeRequestResponse{buf}, nil
} }
func (m *fakeModel) ClusterConfig(deviceID DeviceID, config ClusterConfig) { func (m *fakeModel) ClusterConfig(deviceID DeviceID, config ClusterConfig) error {
return nil
} }
func (m *fakeModel) Closed(conn Connection, err error) { func (m *fakeModel) Closed(conn Connection, err error) {
} }
func (m *fakeModel) DownloadProgress(deviceID DeviceID, folder string, updates []FileDownloadProgressUpdate) { func (m *fakeModel) DownloadProgress(deviceID DeviceID, folder string, updates []FileDownloadProgressUpdate) error {
return nil
} }

12
lib/protocol/common_test.go
View File

@ -25,13 +25,15 @@ func newTestModel() *TestModel {
} }
} }
func (t *TestModel) Index(deviceID DeviceID, folder string, files []FileInfo) { func (t *TestModel) Index(deviceID DeviceID, folder string, files []FileInfo) error {
if t.indexFn != nil { if t.indexFn != nil {
t.indexFn(deviceID, folder, files) t.indexFn(deviceID, folder, files)
} }
return nil
} }
func (t *TestModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) { func (t *TestModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) error {
return nil
} }
func (t *TestModel) Request(deviceID DeviceID, folder, name string, size int32, offset int64, hash []byte, weakHash uint32, fromTemporary bool) (RequestResponse, error) { func (t *TestModel) Request(deviceID DeviceID, folder, name string, size int32, offset int64, hash []byte, weakHash uint32, fromTemporary bool) (RequestResponse, error) {
@ -52,13 +54,15 @@ func (t *TestModel) Closed(conn Connection, err error) {
close(t.closedCh) close(t.closedCh)
} }
func (t *TestModel) ClusterConfig(deviceID DeviceID, config ClusterConfig) { func (t *TestModel) ClusterConfig(deviceID DeviceID, config ClusterConfig) error {
if t.ccFn != nil { if t.ccFn != nil {
t.ccFn(deviceID, config) t.ccFn(deviceID, config)
} }
return nil
} }
func (t *TestModel) DownloadProgress(DeviceID, string, []FileDownloadProgressUpdate) { func (t *TestModel) DownloadProgress(DeviceID, string, []FileDownloadProgressUpdate) error {
return nil
} }
func (t *TestModel) closedError() error { func (t *TestModel) closedError() error {

8
lib/protocol/nativemodel_darwin.go
View File

@ -12,18 +12,18 @@ type nativeModel struct {
Model Model
} }
func (m nativeModel) Index(deviceID DeviceID, folder string, files []FileInfo) { func (m nativeModel) Index(deviceID DeviceID, folder string, files []FileInfo) error {
for i := range files { for i := range files {
files[i].Name = norm.NFD.String(files[i].Name) files[i].Name = norm.NFD.String(files[i].Name)
} }
m.Model.Index(deviceID, folder, files) return m.Model.Index(deviceID, folder, files)
} }
func (m nativeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) { func (m nativeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) error {
for i := range files { for i := range files {
files[i].Name = norm.NFD.String(files[i].Name) files[i].Name = norm.NFD.String(files[i].Name)
} }
m.Model.IndexUpdate(deviceID, folder, files) return m.Model.IndexUpdate(deviceID, folder, files)
} }
func (m nativeModel) Request(deviceID DeviceID, folder, name string, size int32, offset int64, hash []byte, weakHash uint32, fromTemporary bool) (RequestResponse, error) { func (m nativeModel) Request(deviceID DeviceID, folder, name string, size int32, offset int64, hash []byte, weakHash uint32, fromTemporary bool) (RequestResponse, error) {

8
lib/protocol/nativemodel_windows.go
View File

@ -15,14 +15,14 @@ type nativeModel struct {
Model Model
} }
func (m nativeModel) Index(deviceID DeviceID, folder string, files []FileInfo) { func (m nativeModel) Index(deviceID DeviceID, folder string, files []FileInfo) error {
files = fixupFiles(files) files = fixupFiles(files)
m.Model.Index(deviceID, folder, files) return m.Model.Index(deviceID, folder, files)
} }
func (m nativeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) { func (m nativeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) error {
files = fixupFiles(files) files = fixupFiles(files)
m.Model.IndexUpdate(deviceID, folder, files) return m.Model.IndexUpdate(deviceID, folder, files)
} }
func (m nativeModel) Request(deviceID DeviceID, folder, name string, size int32, offset int64, hash []byte, weakHash uint32, fromTemporary bool) (RequestResponse, error) { func (m nativeModel) Request(deviceID DeviceID, folder, name string, size int32, offset int64, hash []byte, weakHash uint32, fromTemporary bool) (RequestResponse, error) {

32
lib/protocol/protocol.go
View File

@ -111,17 +111,17 @@ var (
type Model interface { type Model interface {
// An index was received from the peer device // An index was received from the peer device
Index(deviceID DeviceID, folder string, files []FileInfo) Index(deviceID DeviceID, folder string, files []FileInfo) error
// An index update was received from the peer device // An index update was received from the peer device
IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) error
// A request was made by the peer device // A request was made by the peer device
Request(deviceID DeviceID, folder, name string, size int32, offset int64, hash []byte, weakHash uint32, fromTemporary bool) (RequestResponse, error) Request(deviceID DeviceID, folder, name string, size int32, offset int64, hash []byte, weakHash uint32, fromTemporary bool) (RequestResponse, error)
// A cluster configuration message was received // A cluster configuration message was received
ClusterConfig(deviceID DeviceID, config ClusterConfig) ClusterConfig(deviceID DeviceID, config ClusterConfig) error
// The peer device closed the connection // The peer device closed the connection
Closed(conn Connection, err error) Closed(conn Connection, err error)
// The peer device sent progress updates for the files it is currently downloading // The peer device sent progress updates for the files it is currently downloading
DownloadProgress(deviceID DeviceID, folder string, updates []FileDownloadProgressUpdate) DownloadProgress(deviceID DeviceID, folder string, updates []FileDownloadProgressUpdate) error
} }
type RequestResponse interface { type RequestResponse interface {
@ -388,7 +388,9 @@ func (c *rawConnection) dispatcherLoop() (err error) {
if state != stateInitial { if state != stateInitial {
return fmt.Errorf("protocol error: cluster config message in state %d", state) return fmt.Errorf("protocol error: cluster config message in state %d", state)
} }
c.receiver.ClusterConfig(c.id, *msg) if err := c.receiver.ClusterConfig(c.id, *msg); err != nil {
return errors.Wrap(err, "receiver error")
}
state = stateReady state = stateReady
case *Index: case *Index:
@ -399,7 +401,9 @@ func (c *rawConnection) dispatcherLoop() (err error) {
if err := checkIndexConsistency(msg.Files); err != nil { if err := checkIndexConsistency(msg.Files); err != nil {
return errors.Wrap(err, "protocol error: index") return errors.Wrap(err, "protocol error: index")
} }
c.handleIndex(*msg) if err := c.handleIndex(*msg); err != nil {
return errors.Wrap(err, "receiver error")
}
state = stateReady state = stateReady
case *IndexUpdate: case *IndexUpdate:
@ -410,7 +414,9 @@ func (c *rawConnection) dispatcherLoop() (err error) {
if err := checkIndexConsistency(msg.Files); err != nil { if err := checkIndexConsistency(msg.Files); err != nil {
return errors.Wrap(err, "protocol error: index update") return errors.Wrap(err, "protocol error: index update")
} }
c.handleIndexUpdate(*msg) if err := c.handleIndexUpdate(*msg); err != nil {
return errors.Wrap(err, "receiver error")
}
state = stateReady state = stateReady
case *Request: case *Request:
@ -435,7 +441,9 @@ func (c *rawConnection) dispatcherLoop() (err error) {
if state != stateReady { if state != stateReady {
return fmt.Errorf("protocol error: response message in state %d", state) return fmt.Errorf("protocol error: response message in state %d", state)
} }
c.receiver.DownloadProgress(c.id, msg.Folder, msg.Updates) if err := c.receiver.DownloadProgress(c.id, msg.Folder, msg.Updates); err != nil {
return errors.Wrap(err, "receiver error")
}
case *Ping: case *Ping:
l.Debugln("read Ping message") l.Debugln("read Ping message")
@ -543,14 +551,14 @@ func (c *rawConnection) readHeader(fourByteBuf []byte) (Header, error) {
return hdr, nil return hdr, nil
} }
func (c *rawConnection) handleIndex(im Index) { func (c *rawConnection) handleIndex(im Index) error {
l.Debugf("Index(%v, %v, %d file)", c.id, im.Folder, len(im.Files)) l.Debugf("Index(%v, %v, %d file)", c.id, im.Folder, len(im.Files))
c.receiver.Index(c.id, im.Folder, im.Files) return c.receiver.Index(c.id, im.Folder, im.Files)
} }
func (c *rawConnection) handleIndexUpdate(im IndexUpdate) { func (c *rawConnection) handleIndexUpdate(im IndexUpdate) error {
l.Debugf("queueing IndexUpdate(%v, %v, %d files)", c.id, im.Folder, len(im.Files)) l.Debugf("queueing IndexUpdate(%v, %v, %d files)", c.id, im.Folder, len(im.Files))
c.receiver.IndexUpdate(c.id, im.Folder, im.Files) return c.receiver.IndexUpdate(c.id, im.Folder, im.Files)
} }
// checkIndexConsistency verifies a number of invariants on FileInfos received in // checkIndexConsistency verifies a number of invariants on FileInfos received in