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derp: document the RunWatchConnectionLoop callback gotchas

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Updates #13566

Change-Id: I497b5adc57f8b1b97dbc3f74c0dc67140caad436
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-09-24 15:11:31 -07:00
committed by Brad Fitzpatrick
parent 6f7e7a30e3
commit e1bbe1bf45
2 changed files with 15 additions and 2 deletions
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13
derp/derp_client.go
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@@ -356,6 +356,10 @@ func (ReceivedPacket) msg() {}
// PeerGoneMessage is a ReceivedMessage that indicates that the client
// identified by the underlying public key is not connected to this
// server.
//
// It has only historically been sent by the server when the client
// connection count decremented from 1 to 0 and not from e.g. 2 to 1.
// See https://github.com/tailscale/tailscale/issues/13566 for details.
type PeerGoneMessage struct {
Peer key.NodePublic
Reason PeerGoneReasonType
@@ -363,8 +367,13 @@ type PeerGoneMessage struct {
func (PeerGoneMessage) msg() {}
// PeerPresentMessage is a ReceivedMessage that indicates that the client
// is connected to the server. (Only used by trusted mesh clients)
// PeerPresentMessage is a ReceivedMessage that indicates that the client is
// connected to the server. (Only used by trusted mesh clients)
//
// It will be sent to client watchers for every new connection from a client,
// even if the client's already connected with that public key.
// See https://github.com/tailscale/tailscale/issues/13566 for PeerPresentMessage
// and PeerGoneMessage not being 1:1.
type PeerPresentMessage struct {
// Key is the public key of the client.
Key key.NodePublic