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derp: add new health update and server restarting frame types

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Updates #2756
Updates #2746

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-08-31 12:27:24 -07:00
committed by Brad Fitzpatrick
parent 0b9e938152
commit a59b389a6a
3 changed files with 89 additions and 0 deletions
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14
derp/derp.go
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@@ -101,6 +101,20 @@ const (
framePing = frameType(0x12) // 8 byte ping payload, to be echoed back in framePong
framePong = frameType(0x13) // 8 byte payload, the contents of the ping being replied to
// frameHealth is sent from server to client to tell the client
// if their connection is unhealthy somehow. Currently the only unhealthy state
// is whether the connection is detected as a duplicate.
// The entire frame body is the text of the error message. An empty message
// clears the error state.
frameHealth = frameType(0x14)
// frameRestarting is sent from server to client for the
// server to declare that it's restarting. Payload is two big
// endian uint32 durations in milliseconds: when to reconnect,
// and how long to try total. See ServerRestartingMessage docs for
// more details on how the client should interpret them.
frameRestarting = frameType(0x15)
)
var bin = binary.BigEndian