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Fix race condition between incoming and outgoing connection setup

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This commit is contained in:
Neil Alexander 2023-05-22 23:10:44 +01:00
parent 8562b6b86e
commit 06ca8941c7
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GPG Key ID: A02A2019A2BB0944
1 changed files with 11 additions and 5 deletions
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12
src/core/link.go
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@ -268,8 +268,6 @@ func (l *links) add(u *url.URL, sintf string, linkType linkType) error {
// Clear the error state. // Clear the error state.
state.Lock() state.Lock()
state._conn = lc state._conn = lc
state._err = nil
state._errtime = time.Time{}
state.Unlock() state.Unlock()
// Give the connection to the handler. The handler will block // Give the connection to the handler. The handler will block
@ -368,10 +366,18 @@ func (l *links) listen(u *url.URL, sintf string) (*Listener, error) {
// connection. This prevents duplicate peerings. // connection. This prevents duplicate peerings.
l.Lock() l.Lock()
state, ok := l._links[info] state, ok := l._links[info]
if ok && state != nil && state._conn != nil { if ok && state != nil {
switch {
case state._conn != nil:
// We are already connected to something.
case state._conn == nil && state._errtime == time.Time{}:
// We aren't connected yet, but the fact that there
// is no last error suggests we haven't yet attempted
// an outbound connection at all.
l.Unlock() l.Unlock()
return return
} }
}
if !ok || state == nil { if !ok || state == nil {
state = &link{ state = &link{
linkType: linkTypeIncoming, linkType: linkTypeIncoming,