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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
7 changed files with 76 additions and 51 deletions
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32
lib/protocol/protocol.go
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@@ -111,17 +111,17 @@ var (
type Model interface {
// 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
IndexUpdate(deviceID DeviceID, folder string, files []FileInfo)
IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) error
// 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)
// A cluster configuration message was received
ClusterConfig(deviceID DeviceID, config ClusterConfig)
ClusterConfig(deviceID DeviceID, config ClusterConfig) error
// The peer device closed the connection
Closed(conn Connection, err error)
// 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 {
@@ -388,7 +388,9 @@ func (c *rawConnection) dispatcherLoop() (err error) {
if state != stateInitial {
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
case *Index:
@@ -399,7 +401,9 @@ func (c *rawConnection) dispatcherLoop() (err error) {
if err := checkIndexConsistency(msg.Files); err != nil {
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
case *IndexUpdate:
@@ -410,7 +414,9 @@ func (c *rawConnection) dispatcherLoop() (err error) {
if err := checkIndexConsistency(msg.Files); err != nil {
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
case *Request:
@@ -435,7 +441,9 @@ func (c *rawConnection) dispatcherLoop() (err error) {
if state != stateReady {
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:
l.Debugln("read Ping message")
@@ -543,14 +551,14 @@ func (c *rawConnection) readHeader(fourByteBuf []byte) (Header, error) {
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))
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))
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