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eventsystem.go
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eventsystem.go
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package eventsystem
//go:generate go run gen/events_gen.go -o events.go
import (
"context"
"github.com/jonas747/discordgo"
"github.com/sirupsen/logrus"
"runtime/debug"
)
type Handler func(evtData *EventData)
type EventData struct {
EvtInterface interface{}
Type Event
ctx context.Context
Session *discordgo.Session
}
var (
ConcurrentAfter *Handler
)
func (e *EventData) Context() context.Context {
if e.ctx == nil {
return context.Background()
}
return e.ctx
}
func (e *EventData) WithContext(ctx context.Context) *EventData {
cop := new(EventData)
*cop = *e
cop.ctx = ctx
return cop
}
// EmitEvent emits an event
func EmitEvent(data *EventData, evt Event) {
for i, v := range handlers[evt] {
(*v)(data)
// Check if we should start firing the rest in a different goroutine
if ConcurrentAfter != nil && ConcurrentAfter == v {
go func(startFrom int) {
defer func() {
if err := recover(); err != nil {
stack := string(debug.Stack())
logrus.WithField(logrus.ErrorKey, err).WithField("evt", data.Type.String()).Error("Recovered from panic in event handler\n" + stack)
}
}()
for j := startFrom; j < len(handlers[evt]); j++ {
(*handlers[evt][j])(data)
}
}(i + 1)
break
}
}
}
// AddHandler adds a event handler
func AddHandler(handler Handler, evts ...Event) *Handler {
hPtr := &handler
for _, evt := range evts {
if evt == EventAll {
for _, e := range AllDiscordEvents {
handlers[e] = append(handlers[e], hPtr)
}
// If one of the events is all, then there's not point in passing more
return hPtr
}
}
for _, evt := range evts {
handlers[evt] = append(handlers[evt], hPtr)
}
return hPtr
}
// AddHandlerFirst adds a handler first in the queue
func AddHandlerFirst(handler Handler, evt Event) *Handler {
hPtr := &handler
if evt == EventAll {
for _, e := range AllDiscordEvents {
handlers[e] = append([]*Handler{hPtr}, handlers[e]...)
}
return hPtr
}
handlers[evt] = append([]*Handler{hPtr}, handlers[evt]...)
return hPtr
}
// AddHandlerBefore adds a handler to be called before another handler
func AddHandlerBefore(handler Handler, evt Event, before *Handler) *Handler {
hPtr := &handler
addHandlerBefore(hPtr, evt, before)
return hPtr
}
func addHandlerBefore(handler *Handler, evt Event, before *Handler) {
if evt == EventAll {
for _, e := range AllDiscordEvents {
addHandlerBefore(handler, e, before)
}
return
}
for k, v := range handlers[evt] {
if v == before {
// Make a copy with the first half in
handlersCop := make([]*Handler, len(handlers[evt])+1)
copy(handlersCop, handlers[evt][:k])
// insert the handler
handlersCop[k] = handler
// add the other half
for i := k; i < len(handlers[evt]); i++ {
handlersCop[i+1] = handlers[evt][i]
}
handlers[evt] = handlersCop
return
}
}
logrus.Error("Unable to add handler before other handler", handler, before)
// Not found, just add to end
handlers[evt] = append(handlers[evt], handler)
}
func NumHandlers(evt Event) int {
if evt != EventAll {
return len(handlers[evt])
}
total := 0
for _, v := range handlers {
total += len(v)
}
return total
}