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don't allocate a new child cancellation in Conn read/write calls if no deadline is set

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This commit is contained in:
Arceliar 2019-08-19 18:06:05 -05:00
parent c04816b4bd
commit 834a6a6f1a
1 changed files with 13 additions and 8 deletions
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17
src/yggdrasil/conn.go
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@ -137,20 +137,23 @@ func (c *Conn) doSearch() {
go func() { c.core.router.admin <- routerWork }()
}
func (c *Conn) getDeadlineCancellation(value *atomic.Value) util.Cancellation {
func (c *Conn) getDeadlineCancellation(value *atomic.Value) (util.Cancellation, bool) {
if deadline, ok := value.Load().(time.Time); ok {
// A deadline is set, so return a Cancellation that uses it
return util.CancellationWithDeadline(c.session.cancel, deadline)
c := util.CancellationWithDeadline(c.session.cancel, deadline)
return c, true
} else {
// No cancellation was set, so return a child cancellation with no timeout
return util.CancellationChild(c.session.cancel)
// No deadline was set, so just return the existinc cancellation and a dummy value
return c.session.cancel, false
}
}
// Used internally by Read, the caller is responsible for util.PutBytes when they're done.
func (c *Conn) ReadNoCopy() ([]byte, error) {
cancel := c.getDeadlineCancellation(&c.readDeadline)
cancel, doCancel := c.getDeadlineCancellation(&c.readDeadline)
if doCancel {
defer cancel.Cancel(nil)
}
// Wait for some traffic to come through from the session
select {
case <-cancel.Finished():
@ -207,8 +210,10 @@ func (c *Conn) WriteNoCopy(msg FlowKeyMessage) error {
}
c.session.doFunc(sessionFunc)
if err == nil {
cancel := c.getDeadlineCancellation(&c.writeDeadline)
cancel, doCancel := c.getDeadlineCancellation(&c.writeDeadline)
if doCancel {
defer cancel.Cancel(nil)
}
select {
case <-cancel.Finished():
if cancel.Error() == util.CancellationTimeoutError {