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Code Issues Releases Activity

Session: Fixed a potential race condition on Close

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This commit is contained in:
diamondburned 2020-10-17 03:21:07 -07:00
parent 397d288927
commit 86795e42a6
1 changed files with 9 additions and 13 deletions
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22
session/session.go
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@ -4,6 +4,8 @@
package session
import (
"sync"
"github.com/pkg/errors"
"github.com/diamondburned/arikawa/api"
@ -39,6 +41,7 @@ type Session struct {
Ticket string
hstop chan struct{}
wstop sync.Once
}
func NewWithIntents(token string, intents ...gateway.Intents) (*Session, error) {
@ -103,9 +106,9 @@ func NewWithGateway(gw *gateway.Gateway) *Session {
func (s *Session) Open() error {
// Start the handler beforehand so no events are missed.
stop := make(chan struct{})
s.hstop = stop
go s.startHandler(stop)
s.hstop = make(chan struct{})
s.wstop = sync.Once{}
go s.startHandler()
// Set the AfterClose's handler.
s.Gateway.AfterClose = func(err error) {
@ -121,10 +124,10 @@ func (s *Session) Open() error {
return nil
}
func (s *Session) startHandler(stop <-chan struct{}) {
func (s *Session) startHandler() {
for {
select {
case <-stop:
case <-s.hstop:
return
case ev := <-s.Gateway.Events:
s.Call(ev)
@ -134,14 +137,7 @@ func (s *Session) startHandler(stop <-chan struct{}) {
func (s *Session) Close() error {
// Stop the event handler
s.close()
s.wstop.Do(func() { s.hstop <- struct{}{} })
// Close the websocket
return s.Gateway.Close()
}
func (s *Session) close() {
if s.hstop != nil {
close(s.hstop)
}
}