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Prepare notify channel before sending first update (#1730)

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* create channel before sending first update

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

* do not notify on register, wait for connect

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

---------

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>
This commit is contained in:
Kristoffer Dalby
2024-02-12 09:11:17 +01:00
committed by GitHub
parent c3257e2146
commit 68a8ecee7a
3 changed files with 30 additions and 45 deletions
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38
hscontrol/poll.go
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@@ -13,6 +13,7 @@ import (
"github.com/rs/zerolog/log"
xslices "golang.org/x/exp/slices"
"gorm.io/gorm"
"tailscale.com/envknob"
"tailscale.com/tailcfg"
)
@@ -277,6 +278,25 @@ func (h *Headscale) handlePoll(
return
}
// Set up the client stream
h.pollNetMapStreamWG.Add(1)
defer h.pollNetMapStreamWG.Done()
// Use a buffered channel in case a node is not fully ready
// to receive a message to make sure we dont block the entire
// notifier.
// 12 is arbitrarily chosen.
chanSize := 3
if size, ok := envknob.LookupInt("HEADSCALE_TUNING_POLL_QUEUE_SIZE"); ok {
chanSize = size
}
updateChan := make(chan types.StateUpdate, chanSize)
defer closeChanWithLog(updateChan, node.Hostname, "updateChan")
// Register the node's update channel
h.nodeNotifier.AddNode(node.MachineKey, updateChan)
defer h.nodeNotifier.RemoveNode(node.MachineKey)
// When a node connects to control, list the peers it has at
// that given point, further updates are kept in memory in
// the Mapper, which lives for the duration of the polling
@@ -289,8 +309,9 @@ func (h *Headscale) handlePoll(
return
}
isConnected := h.nodeNotifier.ConnectedMap()
for _, peer := range peers {
online := h.nodeNotifier.IsConnected(peer.MachineKey)
online := isConnected[peer.MachineKey]
peer.IsOnline = &online
}
@@ -357,21 +378,6 @@ func (h *Headscale) handlePoll(
go h.pollFailoverRoutes(logErr, "new node", node)
}
// Set up the client stream
h.pollNetMapStreamWG.Add(1)
defer h.pollNetMapStreamWG.Done()
// Use a buffered channel in case a node is not fully ready
// to receive a message to make sure we dont block the entire
// notifier.
// 12 is arbitrarily chosen.
updateChan := make(chan types.StateUpdate, 12)
defer closeChanWithLog(updateChan, node.Hostname, "updateChan")
// Register the node's update channel
h.nodeNotifier.AddNode(node.MachineKey, updateChan)
defer h.nodeNotifier.RemoveNode(node.MachineKey)
keepAliveTicker := time.NewTicker(keepAliveInterval)
ctx, cancel := context.WithCancel(context.WithValue(ctx, nodeNameContextKey, node.Hostname))