add vendoring

vendor/maunium.net/go/mautrix/appservice/eventprocessor.go

@@ -0,0 +1,158 @@
+// Copyright (c) 2020 Tulir Asokan
+//
+// 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 http://mozilla.org/MPL/2.0/.
+
+package appservice
+
+import (
+	"encoding/json"
+	"runtime/debug"
+
+	log "maunium.net/go/maulogger/v2"
+
+	"maunium.net/go/mautrix"
+	"maunium.net/go/mautrix/event"
+)
+
+type ExecMode uint8
+
+const (
+	AsyncHandlers ExecMode = iota
+	AsyncLoop
+	Sync
+)
+
+type EventHandler func(evt *event.Event)
+type OTKHandler func(otk *mautrix.OTKCount)
+type DeviceListHandler func(otk *mautrix.DeviceLists, since string)
+
+type EventProcessor struct {
+	ExecMode ExecMode
+
+	as       *AppService
+	log      log.Logger
+	stop     chan struct{}
+	handlers map[event.Type][]EventHandler
+
+	otkHandlers        []OTKHandler
+	deviceListHandlers []DeviceListHandler
+}
+
+func NewEventProcessor(as *AppService) *EventProcessor {
+	return &EventProcessor{
+		ExecMode: AsyncHandlers,
+		as:       as,
+		log:      as.Log.Sub("Events"),
+		stop:     make(chan struct{}, 1),
+		handlers: make(map[event.Type][]EventHandler),
+
+		otkHandlers:        make([]OTKHandler, 0),
+		deviceListHandlers: make([]DeviceListHandler, 0),
+	}
+}
+
+func (ep *EventProcessor) On(evtType event.Type, handler EventHandler) {
+	handlers, ok := ep.handlers[evtType]
+	if !ok {
+		handlers = []EventHandler{handler}
+	} else {
+		handlers = append(handlers, handler)
+	}
+	ep.handlers[evtType] = handlers
+}
+
+func (ep *EventProcessor) PrependHandler(evtType event.Type, handler EventHandler) {
+	handlers, ok := ep.handlers[evtType]
+	if !ok {
+		handlers = []EventHandler{handler}
+	} else {
+		handlers = append([]EventHandler{handler}, handlers...)
+	}
+	ep.handlers[evtType] = handlers
+}
+
+func (ep *EventProcessor) OnOTK(handler OTKHandler) {
+	ep.otkHandlers = append(ep.otkHandlers, handler)
+}
+
+func (ep *EventProcessor) OnDeviceList(handler DeviceListHandler) {
+	ep.deviceListHandlers = append(ep.deviceListHandlers, handler)
+}
+
+func (ep *EventProcessor) recoverFunc(data interface{}) {
+	if err := recover(); err != nil {
+		d, _ := json.Marshal(data)
+		ep.log.Errorfln("Panic in Matrix event handler: %v (event content: %s):\n%s", err, string(d), string(debug.Stack()))
+	}
+}
+
+func (ep *EventProcessor) callHandler(handler EventHandler, evt *event.Event) {
+	defer ep.recoverFunc(evt)
+	handler(evt)
+}
+
+func (ep *EventProcessor) callOTKHandler(handler OTKHandler, otk *mautrix.OTKCount) {
+	defer ep.recoverFunc(otk)
+	handler(otk)
+}
+
+func (ep *EventProcessor) callDeviceListHandler(handler DeviceListHandler, dl *mautrix.DeviceLists) {
+	defer ep.recoverFunc(dl)
+	handler(dl, "")
+}
+
+func (ep *EventProcessor) DispatchOTK(otk *mautrix.OTKCount) {
+	for _, handler := range ep.otkHandlers {
+		go ep.callOTKHandler(handler, otk)
+	}
+}
+
+func (ep *EventProcessor) DispatchDeviceList(dl *mautrix.DeviceLists) {
+	for _, handler := range ep.deviceListHandlers {
+		go ep.callDeviceListHandler(handler, dl)
+	}
+}
+
+func (ep *EventProcessor) Dispatch(evt *event.Event) {
+	handlers, ok := ep.handlers[evt.Type]
+	if !ok {
+		return
+	}
+	switch ep.ExecMode {
+	case AsyncHandlers:
+		for _, handler := range handlers {
+			go ep.callHandler(handler, evt)
+		}
+	case AsyncLoop:
+		go func() {
+			for _, handler := range handlers {
+				ep.callHandler(handler, evt)
+			}
+		}()
+	case Sync:
+		for _, handler := range handlers {
+			ep.callHandler(handler, evt)
+		}
+	}
+}
+
+func (ep *EventProcessor) Start() {
+	for {
+		select {
+		case evt := <-ep.as.Events:
+			ep.Dispatch(evt)
+		case otk := <-ep.as.OTKCounts:
+			ep.DispatchOTK(otk)
+		case dl := <-ep.as.DeviceLists:
+			ep.DispatchDeviceList(dl)
+		case <-ep.stop:
+			return
+		}
+	}
+}
+
+func (ep *EventProcessor) Stop() {
+	ep.stop <- struct{}{}
+}