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// Copyright (c) 2023 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"
"github.com/rs/zerolog"
"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(lists *mautrix.DeviceLists, since string)
type EventProcessor struct {
ExecMode ExecMode
as *AppService
stop chan struct{}
handlers map[event.Type][]EventHandler
otkHandlers []OTKHandler
deviceListHandlers []DeviceListHandler
}
func NewEventProcessor(as *AppService) *EventProcessor {
return &EventProcessor{
ExecMode: AsyncHandlers,
as: as,
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.as.Log.Error().
Str(zerolog.ErrorStackFieldName, string(debug.Stack())).
Interface(zerolog.ErrorFieldName, err).
Str("event_content", string(d)).
Msg("Panic in Matrix event handler")
}
}
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) startEvents() {
for {
select {
case evt := <-ep.as.Events:
ep.Dispatch(evt)
case <-ep.stop:
return
}
}
}
func (ep *EventProcessor) startEncryption() {
for {
select {
case evt := <-ep.as.ToDeviceEvents:
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) Start() {
go ep.startEvents()
go ep.startEncryption()
}
func (ep *EventProcessor) Stop() {
close(ep.stop)
}
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