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scheduledevents.go
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scheduledevents.go
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package scheduledevents2
//go:generate sqlboiler psql
import (
"context"
"encoding/json"
"github.com/jonas747/discordgo"
"github.com/jonas747/yagpdb/bot"
"github.com/jonas747/yagpdb/common"
"github.com/jonas747/yagpdb/common/scheduledevents2/models"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/volatiletech/sqlboiler/boil"
"github.com/volatiletech/sqlboiler/queries/qm"
"math/rand"
"reflect"
"sync"
"time"
)
type ScheduledEvents struct {
stop chan *sync.WaitGroup
currentlyProcessingMU sync.Mutex
currentlyProcessing map[int64]bool
}
func newScheduledEventsPlugin() *ScheduledEvents {
return &ScheduledEvents{
stop: make(chan *sync.WaitGroup),
currentlyProcessing: make(map[int64]bool),
}
}
func RegisterPlugin() {
err := InitSchema()
if err != nil {
logrus.WithError(err).Fatal("scheduledevents failed initializing db schema")
}
common.RegisterPlugin(newScheduledEventsPlugin())
}
func InitSchema() error {
_, err := common.PQ.Exec(DBSchema)
return err
}
func (se *ScheduledEvents) Name() string {
return "scheduled_events"
}
type HandlerFunc func(evt *models.ScheduledEvent, data interface{}) (retry bool, err error)
type RegisteredHandler struct {
EvtName string
DataFormat interface{}
Handler HandlerFunc
}
var (
registeredHandlers = make(map[string]*RegisteredHandler)
)
// RegisterHandler registers a handler for the scpecified event name
// dataFormat is optional and should not be a pointer, it should match the type you're passing into ScheduleEvent
func RegisterHandler(eventName string, dataFormat interface{}, handler HandlerFunc) {
registeredHandlers[eventName] = &RegisteredHandler{
EvtName: eventName,
DataFormat: dataFormat,
Handler: handler,
}
logrus.Debug("[scheduledEvents2] Registered handler for ", eventName)
}
func ScheduleEvent(evtName string, guildID int64, runAt time.Time, data interface{}) error {
m := &models.ScheduledEvent{
TriggersAt: runAt,
EventName: evtName,
GuildID: guildID,
}
if data != nil {
b, err := json.Marshal(data)
if err != nil {
return errors.WithMessage(err, "marshal")
}
m.Data = b
} else {
m.Data = []byte("{}")
}
err := m.InsertG(context.Background(), boil.Infer())
return errors.WithMessage(err, "insert")
}
var _ bot.BotInitHandler = (*ScheduledEvents)(nil)
var _ bot.BotStopperHandler = (*ScheduledEvents)(nil)
func (se *ScheduledEvents) BotInit() {
go se.runCheckLoop()
go se.MigrateLegacyEvents()
}
func (se *ScheduledEvents) StopBot(wg *sync.WaitGroup) {
se.stop <- wg
}
func (se *ScheduledEvents) runCheckLoop() {
t := time.NewTicker(time.Second)
for {
select {
case wg := <-se.stop:
wg.Done()
return
case <-t.C:
se.check()
}
}
}
func (se *ScheduledEvents) check() {
se.currentlyProcessingMU.Lock()
defer se.currentlyProcessingMU.Unlock()
toProcess, err := models.ScheduledEvents(qm.Where("triggers_at < now() AND processed=false")).AllG(context.Background())
if err != nil {
logrus.WithError(err).Error("[scheduledevents2] failed checking for events to process")
return
}
numSkipped := 0
numHandling := 0
for _, p := range toProcess {
if !bot.IsGuildOnCurrentProcess(p.GuildID) {
numSkipped++
continue
}
if v := se.currentlyProcessing[p.ID]; v {
continue
}
numHandling++
se.currentlyProcessing[p.ID] = true
go se.processItem(p)
}
if numHandling > 0 {
logrus.Info("[scheduledevents2] triggered ", numHandling, " scheduled events (skipped ", numSkipped, ")")
}
}
func (se *ScheduledEvents) processItem(item *models.ScheduledEvent) {
l := logrus.WithField("id", item.ID).WithField("evt", item.EventName)
handler, ok := registeredHandlers[item.EventName]
if !ok {
l.Error("[scheduledevents2] unknown event: ", item.EventName)
se.markDone(item)
return
}
var decodedData interface{}
if handler.DataFormat != nil {
typ := reflect.TypeOf(handler.DataFormat)
// Decode the form into the destination struct
decodedData = reflect.New(typ).Interface()
err := json.Unmarshal(item.Data, decodedData)
if err != nil {
l.WithError(err).Error("[scheduledevents2] failed decoding event data")
se.markDone(item)
return
}
}
for {
retry, err := handler.Handler(item, decodedData)
if err != nil {
l.WithError(err).Error("[scheduledevents2] handler returned an error")
}
if retry {
l.WithError(err).Warn("[scheduledevents2] retrying handling event")
time.Sleep(time.Second * time.Duration(rand.Intn(10)+5))
continue
}
se.markDone(item)
break
}
}
func (se *ScheduledEvents) markDone(item *models.ScheduledEvent) {
item.Processed = true
_, err := item.UpdateG(context.Background(), boil.Whitelist("processed"))
se.currentlyProcessingMU.Lock()
delete(se.currentlyProcessing, item.ID)
se.currentlyProcessingMU.Unlock()
if err != nil {
logrus.WithError(err).Error("[scheduledevents2] failed marking item as processed")
}
}
func CheckDiscordErrRetry(err error) bool {
if err == nil {
return false
}
err = errors.Cause(err)
if cast, ok := err.(*discordgo.RESTError); ok {
if cast.Message != nil && cast.Message.Code != 0 {
// proper discord response, don't retry
return false
}
}
if err == bot.ErrGuildNotFound {
return false
}
// an unknown error unrelated to the discord api occured (503's for example) attempt a retry
return true
}