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cmd/syncthing: Allow custom event subscriptions (fixes #1879)

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This adds a parameter "events" to the /rest/events endpoint. It should
be a comma separated list of the events the consumer is interested in.
When not given it defaults to the current set of events, so it's
backwards compatible.

The API service then manages subscriptions, creating them as required
for each requested event mask. Old subscriptions are not "garbage
collected" - it's assumed that in normal usage the set of event
subscriptions will be small enough. Possibly lower than before, as we
will not set up the disk event subscription unless it's actually used.

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4092
This commit is contained in:
Jakob Borg 2017-04-13 17:14:34 +00:00 committed by Audrius Butkevicius
parent 75460be98d
commit d48e46a29c
4 changed files with 149 additions and 19 deletions
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65
cmd/syncthing/gui.go
View File

@ -45,6 +45,12 @@ var (
startTime = time.Now()
)
const (
defaultEventMask = events.AllEvents &^ events.LocalChangeDetected &^ events.RemoteChangeDetected
diskEventMask = events.LocalChangeDetected | events.RemoteChangeDetected
eventSubBufferSize = 1000
)
type apiService struct {
id protocol.DeviceID
cfg configIntf
@ -52,8 +58,8 @@ type apiService struct {
httpsKeyFile string
statics *staticsServer
model modelIntf
eventSub events.BufferedSubscription
diskEventSub events.BufferedSubscription
eventSubs map[events.EventType]events.BufferedSubscription
eventSubsMut sync.Mutex
discoverer discover.CachingMux
connectionsService connectionsIntf
fss *folderSummaryService
@ -114,16 +120,19 @@ type connectionsIntf interface {
Status() map[string]interface{}
}
func newAPIService(id protocol.DeviceID, cfg configIntf, httpsCertFile, httpsKeyFile, assetDir string, m modelIntf, eventSub events.BufferedSubscription, diskEventSub events.BufferedSubscription, discoverer discover.CachingMux, connectionsService connectionsIntf, errors, systemLog logger.Recorder) *apiService {
func newAPIService(id protocol.DeviceID, cfg configIntf, httpsCertFile, httpsKeyFile, assetDir string, m modelIntf, defaultSub, diskSub events.BufferedSubscription, discoverer discover.CachingMux, connectionsService connectionsIntf, errors, systemLog logger.Recorder) *apiService {
service := &apiService{
id: id,
cfg: cfg,
httpsCertFile: httpsCertFile,
httpsKeyFile: httpsKeyFile,
statics: newStaticsServer(cfg.GUI().Theme, assetDir),
model: m,
eventSub: eventSub,
diskEventSub: diskEventSub,
id: id,
cfg: cfg,
httpsCertFile: httpsCertFile,
httpsKeyFile: httpsKeyFile,
statics: newStaticsServer(cfg.GUI().Theme, assetDir),
model: m,
eventSubs: map[events.EventType]events.BufferedSubscription{
defaultEventMask: defaultSub,
diskEventMask: diskSub,
},
eventSubsMut: sync.NewMutex(),
discoverer: discoverer,
connectionsService: connectionsService,
systemConfigMut: sync.NewMutex(),
@ -234,7 +243,7 @@ func (s *apiService) Serve() {
getRestMux.HandleFunc("/rest/db/need", s.getDBNeed) // folder [perpage] [page]
getRestMux.HandleFunc("/rest/db/status", s.getDBStatus) // folder
getRestMux.HandleFunc("/rest/db/browse", s.getDBBrowse) // folder [prefix] [dirsonly] [levels]
getRestMux.HandleFunc("/rest/events", s.getIndexEvents) // [since] [limit] [timeout]
getRestMux.HandleFunc("/rest/events", s.getIndexEvents) // [since] [limit] [timeout] [events]
getRestMux.HandleFunc("/rest/events/disk", s.getDiskEvents) // [since] [limit] [timeout]
getRestMux.HandleFunc("/rest/stats/device", s.getDeviceStats) // -
getRestMux.HandleFunc("/rest/stats/folder", s.getFolderStats) // -
@ -1011,11 +1020,14 @@ func (s *apiService) postDBIgnores(w http.ResponseWriter, r *http.Request) {
func (s *apiService) getIndexEvents(w http.ResponseWriter, r *http.Request) {
s.fss.gotEventRequest()
s.getEvents(w, r, s.eventSub)
mask := s.getEventMask(r.URL.Query().Get("events"))
sub := s.getEventSub(mask)
s.getEvents(w, r, sub)
}
func (s *apiService) getDiskEvents(w http.ResponseWriter, r *http.Request) {
s.getEvents(w, r, s.diskEventSub)
sub := s.getEventSub(diskEventMask)
s.getEvents(w, r, sub)
}
func (s *apiService) getEvents(w http.ResponseWriter, r *http.Request, eventSub events.BufferedSubscription) {
@ -1047,6 +1059,31 @@ func (s *apiService) getEvents(w http.ResponseWriter, r *http.Request, eventSub
sendJSON(w, evs)
}
func (s *apiService) getEventMask(evs string) events.EventType {
eventMask := defaultEventMask
if evs != "" {
eventList := strings.Split(evs, ",")
eventMask = 0
for _, ev := range eventList {
eventMask |= events.UnmarshalEventType(strings.TrimSpace(ev))
}
}
return eventMask
}
func (s *apiService) getEventSub(mask events.EventType) events.BufferedSubscription {
s.eventSubsMut.Lock()
bufsub, ok := s.eventSubs[mask]
if !ok {
evsub := events.Default.Subscribe(mask)
bufsub = events.NewBufferedSubscription(evsub, eventSubBufferSize)
s.eventSubs[mask] = bufsub
}
s.eventSubsMut.Unlock()
return bufsub
}
func (s *apiService) getSystemUpgrade(w http.ResponseWriter, r *http.Request) {
if noUpgradeFromEnv {
http.Error(w, upgrade.ErrUpgradeUnsupported.Error(), 500)

32
cmd/syncthing/gui_test.go
View File

@ -23,6 +23,7 @@ import (
"github.com/d4l3k/messagediff"
"github.com/syncthing/syncthing/lib/config"
"github.com/syncthing/syncthing/lib/events"
"github.com/syncthing/syncthing/lib/protocol"
"github.com/syncthing/syncthing/lib/sync"
"github.com/thejerf/suture"
@ -924,3 +925,34 @@ func TestOptionsRequest(t *testing.T) {
t.Fatal("OPTIONS on /rest/system/status should return a 'Access-Control-Allow-Headers: Content-Type, X-API-KEY' header")
}
}
func TestEventMasks(t *testing.T) {
cfg := new(mockedConfig)
defSub := new(mockedEventSub)
diskSub := new(mockedEventSub)
svc := newAPIService(protocol.LocalDeviceID, cfg, "", "", "", nil, defSub, diskSub, nil, nil, nil, nil)
if mask := svc.getEventMask(""); mask != defaultEventMask {
t.Errorf("incorrect default mask %x != %x", int64(mask), int64(defaultEventMask))
}
expected := events.FolderSummary | events.LocalChangeDetected
if mask := svc.getEventMask("FolderSummary,LocalChangeDetected"); mask != expected {
t.Errorf("incorrect parsed mask %x != %x", int64(mask), int64(expected))
}
expected = 0
if mask := svc.getEventMask("WeirdEvent,something else that doens't exist"); mask != expected {
t.Errorf("incorrect parsed mask %x != %x", int64(mask), int64(expected))
}
if res := svc.getEventSub(defaultEventMask); res != defSub {
t.Errorf("should have returned the given default event sub")
}
if res := svc.getEventSub(diskEventMask); res != diskSub {
t.Errorf("should have returned the given disk event sub")
}
if res := svc.getEventSub(events.LocalIndexUpdated); res == nil || res == defSub || res == diskSub {
t.Errorf("should have returned a valid, non-default event sub")
}
}

10
cmd/syncthing/main.go
View File

@ -637,8 +637,8 @@ func syncthingMain(runtimeOptions RuntimeOptions) {
// Event subscription for the API; must start early to catch the early
// events. The LocalChangeDetected event might overwhelm the event
// receiver in some situations so we will not subscribe to it here.
apiSub := events.NewBufferedSubscription(events.Default.Subscribe(events.AllEvents&^events.LocalChangeDetected&^events.RemoteChangeDetected), 1000)
diskSub := events.NewBufferedSubscription(events.Default.Subscribe(events.LocalChangeDetected|events.RemoteChangeDetected), 1000)
defaultSub := events.NewBufferedSubscription(events.Default.Subscribe(defaultEventMask), eventSubBufferSize)
diskSub := events.NewBufferedSubscription(events.Default.Subscribe(diskEventMask), eventSubBufferSize)
if len(os.Getenv("GOMAXPROCS")) == 0 {
runtime.GOMAXPROCS(runtime.NumCPU())
@ -868,7 +868,7 @@ func syncthingMain(runtimeOptions RuntimeOptions) {
// GUI
setupGUI(mainService, cfg, m, apiSub, diskSub, cachedDiscovery, connectionsService, errors, systemLog, runtimeOptions)
setupGUI(mainService, cfg, m, defaultSub, diskSub, cachedDiscovery, connectionsService, errors, systemLog, runtimeOptions)
if runtimeOptions.cpuProfile {
f, err := os.Create(fmt.Sprintf("cpu-%d.pprof", os.Getpid()))
@ -1086,7 +1086,7 @@ func startAuditing(mainService *suture.Supervisor, auditFile string) {
l.Infoln("Audit log in", auditDest)
}
func setupGUI(mainService *suture.Supervisor, cfg *config.Wrapper, m *model.Model, apiSub events.BufferedSubscription, diskSub events.BufferedSubscription, discoverer discover.CachingMux, connectionsService *connections.Service, errors, systemLog logger.Recorder, runtimeOptions RuntimeOptions) {
func setupGUI(mainService *suture.Supervisor, cfg *config.Wrapper, m *model.Model, defaultSub, diskSub events.BufferedSubscription, discoverer discover.CachingMux, connectionsService *connections.Service, errors, systemLog logger.Recorder, runtimeOptions RuntimeOptions) {
guiCfg := cfg.GUI()
if !guiCfg.Enabled {
@ -1097,7 +1097,7 @@ func setupGUI(mainService *suture.Supervisor, cfg *config.Wrapper, m *model.Mode
l.Warnln("Insecure admin access is enabled.")
}
api := newAPIService(myID, cfg, locations[locHTTPSCertFile], locations[locHTTPSKeyFile], runtimeOptions.assetDir, m, apiSub, diskSub, discoverer, connectionsService, errors, systemLog)
api := newAPIService(myID, cfg, locations[locHTTPSCertFile], locations[locHTTPSKeyFile], runtimeOptions.assetDir, m, defaultSub, diskSub, discoverer, connectionsService, errors, systemLog)
cfg.Subscribe(api)
mainService.Add(api)

61
lib/events/events.go
View File

@ -118,6 +118,67 @@ func (t EventType) MarshalText() ([]byte, error) {
return []byte(t.String()), nil
}
func UnmarshalEventType(s string) EventType {
switch s {
case "Starting":
return Starting
case "StartupComplete":
return StartupComplete
case "DeviceDiscovered":
return DeviceDiscovered
case "DeviceConnected":
return DeviceConnected
case "DeviceDisconnected":
return DeviceDisconnected
case "DeviceRejected":
return DeviceRejected
case "LocalChangeDetected":
return LocalChangeDetected
case "RemoteChangeDetected":
return RemoteChangeDetected
case "LocalIndexUpdated":
return LocalIndexUpdated
case "RemoteIndexUpdated":
return RemoteIndexUpdated
case "ItemStarted":
return ItemStarted
case "ItemFinished":
return ItemFinished
case "StateChanged":
return StateChanged
case "FolderRejected":
return FolderRejected
case "ConfigSaved":
return ConfigSaved
case "DownloadProgress":
return DownloadProgress
case "RemoteDownloadProgress":
return RemoteDownloadProgress
case "FolderSummary":
return FolderSummary
case "FolderCompletion":
return FolderCompletion
case "FolderErrors":
return FolderErrors
case "DevicePaused":
return DevicePaused
case "DeviceResumed":
return DeviceResumed
case "FolderScanProgress":
return FolderScanProgress
case "FolderPaused":
return FolderPaused
case "FolderResumed":
return FolderResumed
case "ListenAddressesChanged":
return ListenAddressesChanged
case "LoginAttempt":
return LoginAttempt
default:
return 0
}
}
const BufferSize = 64
type Logger struct {