117 lines
2.1 KiB
Go
117 lines
2.1 KiB
Go
package wsutil
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import (
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"time"
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"github.com/diamondburned/arikawa/utils/heart"
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"github.com/pkg/errors"
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)
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// TODO API
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type EventLoop interface {
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Heartbeat() error
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HandleOP(*OP) error
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// HandleEvent(ev Event) error
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}
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// PacemakerLoop provides an event loop with a pacemaker.
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type PacemakerLoop struct {
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pacemaker *heart.Pacemaker // let's not copy this
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pacedeath chan error
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events <-chan Event
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handler func(*OP) error
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Extras ExtraHandlers
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ErrorLog func(error)
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}
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func NewLoop(heartrate time.Duration, evs <-chan Event, evl EventLoop) *PacemakerLoop {
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pacemaker := heart.NewPacemaker(heartrate, evl.Heartbeat)
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return &PacemakerLoop{
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pacemaker: pacemaker,
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events: evs,
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handler: evl.HandleOP,
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}
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}
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func (p *PacemakerLoop) errorLog(err error) {
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if p.ErrorLog == nil {
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WSDebug("Uncaught error:", err)
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return
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}
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p.ErrorLog(err)
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}
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func (p *PacemakerLoop) Pace() error {
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return p.pacemaker.Pace()
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}
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func (p *PacemakerLoop) Echo() {
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p.pacemaker.Echo()
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}
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func (p *PacemakerLoop) Stop() {
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p.pacemaker.Stop()
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}
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func (p *PacemakerLoop) Stopped() bool {
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return p.pacedeath == nil
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}
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func (p *PacemakerLoop) Run() error {
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// If the event loop is already running.
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if p.pacedeath != nil {
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return nil
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}
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// callers should explicitly handle waitgroups.
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p.pacedeath = p.pacemaker.StartAsync(nil)
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defer func() {
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// mark pacedeath once done
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p.pacedeath = nil
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WSDebug("Pacemaker loop has exited.")
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}()
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for {
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select {
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case err := <-p.pacedeath:
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// Got a paceDeath, we're exiting from here on out.
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p.pacedeath = nil // mark
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if err == nil {
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// No error, just exit normally.
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return nil
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}
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return errors.Wrap(err, "Pacemaker died, reconnecting")
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case ev, ok := <-p.events:
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if !ok {
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// Events channel is closed. Kill the pacemaker manually and
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// die.
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p.pacemaker.Stop()
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return <-p.pacedeath
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}
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o, err := DecodeOP(ev)
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if err != nil {
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p.errorLog(errors.Wrap(err, "Failed to decode OP"))
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return err
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}
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// Check the events before handling.
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p.Extras.Check(o)
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// Handle the event
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if err := p.handler(o); err != nil {
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p.errorLog(errors.Wrap(err, "Handler failed"))
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}
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}
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}
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}
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