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Tear out all the complicated update logic

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There is some weird behaviour that seem to storm the update channel. And
our solution with a central map of update channels isnt particularly
elegant.

For now, replace all the complicated stuff with a simple channel that
checks roughly every 10s if the node is up to date. Only generate and
update if there has been changes.
This commit is contained in:
Kristoffer Dalby 2021-10-05 16:17:18 +00:00
parent 6fb8d67825
commit 8abc7575cd
1 changed files with 15 additions and 18 deletions
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31
poll.go
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@ -140,10 +140,9 @@ func (h *Headscale) PollNetMapHandler(c *gin.Context) {
Str("id", c.Param("id")).
Str("machine", m.Name).
Msg("Loading or creating update channel")
updateChan := h.getOrOpenUpdateChannel(m)
updateChan := make(chan struct{})
pollDataChan := make(chan []byte)
// defer close(pollData)
keepAliveChan := make(chan []byte)
@ -160,7 +159,7 @@ func (h *Headscale) PollNetMapHandler(c *gin.Context) {
// It sounds like we should update the nodes when we have received a endpoint update
// even tho the comments in the tailscale code dont explicitly say so.
updateRequestsFromNode.WithLabelValues("endpoint-update").Inc()
go h.notifyChangesToPeers(m)
go func() { updateChan <- struct{}{} }()
return
} else if req.OmitPeers && req.Stream {
log.Warn().
@ -186,7 +185,7 @@ func (h *Headscale) PollNetMapHandler(c *gin.Context) {
Str("machine", m.Name).
Msg("Notifying peers")
updateRequestsFromNode.WithLabelValues("full-update").Inc()
go h.notifyChangesToPeers(m)
go func() { updateChan <- struct{}{} }()
h.PollNetMapStream(c, m, req, mKey, pollDataChan, keepAliveChan, updateChan, cancelKeepAlive)
log.Trace().
@ -206,10 +205,10 @@ func (h *Headscale) PollNetMapStream(
mKey wgkey.Key,
pollDataChan chan []byte,
keepAliveChan chan []byte,
updateChan <-chan struct{},
updateChan chan struct{},
cancelKeepAlive chan struct{},
) {
go h.scheduledPollWorker(cancelKeepAlive, keepAliveChan, mKey, req, m)
go h.scheduledPollWorker(cancelKeepAlive, updateChan, keepAliveChan, mKey, req, m)
c.Stream(func(w io.Writer) bool {
log.Trace().
@ -423,7 +422,8 @@ func (h *Headscale) PollNetMapStream(
Str("machine", m.Name).
Str("channel", "Done").
Msg("Closing update channel")
h.closeUpdateChannel(m)
//h.closeUpdateChannel(m)
close(updateChan)
log.Trace().
Str("handler", "PollNetMapStream").
@ -446,13 +446,14 @@ func (h *Headscale) PollNetMapStream(
func (h *Headscale) scheduledPollWorker(
cancelChan <-chan struct{},
updateChan chan<- struct{},
keepAliveChan chan<- []byte,
mKey wgkey.Key,
req tailcfg.MapRequest,
m *Machine,
) {
keepAliveTicker := time.NewTicker(60 * time.Second)
updateCheckerTicker := time.NewTicker(30 * time.Second)
updateCheckerTicker := time.NewTicker(10 * time.Second)
for {
select {
@ -476,16 +477,12 @@ func (h *Headscale) scheduledPollWorker(
keepAliveChan <- data
case <-updateCheckerTicker.C:
// Send an update request regardless of outdated or not, if data is sent
// to the node is determined in the updateChan consumer block
err := h.sendRequestOnUpdateChannel(m)
if err != nil {
log.Error().
Str("func", "keepAlive").
log.Debug().
Str("func", "scheduledPollWorker").
Str("machine", m.Name).
Err(err).
Msgf("Failed to send update request to %s", m.Name)
}
Msg("Sending update request")
updateRequestsFromNode.WithLabelValues("scheduled-update").Inc()
updateChan <- struct{}{}
}
}
}