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Tweak lock behaviour

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This commit is contained in:
Neil Alexander 2023-05-21 00:02:04 +01:00
parent 333561f4e1
commit cb8333f9ff
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GPG Key ID: A02A2019A2BB0944
1 changed files with 29 additions and 43 deletions
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72
src/core/link.go
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@ -121,16 +121,6 @@ func (l *links) shutdown() {
})
}
func (l *links) isConnectedTo(info linkInfo) bool {
l.RLock()
link, ok := l._links[info]
l.RUnlock()
if !ok {
return false
}
return link._conn != nil
}
type linkError string
func (e linkError) Error() string { return string(e) }
@ -149,30 +139,6 @@ func (l *links) add(u *url.URL, sintf string, linkType linkType) error {
sintf: sintf,
}
// If we think we're already connected to this peer, load up
// the existing peer state. Try to kick the peer if possible,
// which will cause an immediate connection attempt if it is
// backing off for some reason.
l.RLock()
state, ok := l._links[info]
l.RUnlock()
if ok && state != nil {
select {
case state.kick <- struct{}{}:
default:
}
return ErrLinkAlreadyConfigured
}
// Create the link entry. This will contain the connection
// in progress (if any), any error details and a context that
// lets the link be cancelled later.
state = &link{
linkType: linkType,
linkProto: strings.ToUpper(u.Scheme),
kick: make(chan struct{}),
}
// Collect together the link options, these are global options
// that are not specific to any given protocol.
var options linkOptions
@ -196,8 +162,31 @@ func (l *links) add(u *url.URL, sintf string, linkType linkType) error {
options.priority = uint8(pi)
}
// Store the state of the link so that it can be queried later.
// If we think we're already connected to this peer, load up
// the existing peer state. Try to kick the peer if possible,
// which will cause an immediate connection attempt if it is
// backing off for some reason.
l.Lock()
state, ok := l._links[info]
if ok && state != nil {
select {
case state.kick <- struct{}{}:
default:
}
l.Unlock()
return ErrLinkAlreadyConfigured
}
// Create the link entry. This will contain the connection
// in progress (if any), any error details and a context that
// lets the link be cancelled later.
state = &link{
linkType: linkType,
linkProto: strings.ToUpper(u.Scheme),
kick: make(chan struct{}),
}
// Store the state of the link so that it can be queried later.
l._links[info] = state
l.Unlock()
@ -374,17 +363,15 @@ func (l *links) listen(u *url.URL, sintf string) (*Listener, error) {
sintf: sintf,
}
// If there's an existing link state for this link, get it.
// If this node is already connected to us, just drop the
// connection. This prevents duplicate peerings.
if l.isConnectedTo(info) {
l.Lock()
state, ok := l._links[info]
if ok && state != nil && state._conn != nil {
l.Unlock()
return
}
// If there's an existing link state for this link, get it.
// Otherwise just create a new one.
l.RLock()
state, ok := l._links[info]
l.RUnlock()
if !ok || state == nil {
state = &link{
linkType: linkTypeIncoming,
@ -410,7 +397,6 @@ func (l *links) listen(u *url.URL, sintf string) (*Listener, error) {
state.Unlock()
// Store the state of the link so that it can be queried later.
l.Lock()
l._links[info] = state
l.Unlock()