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b816fd7117
This is a small introduction of the eventbus into controlclient that communicates with mainly ipnlocal. While ipnlocal is a complicated part of the codebase, the subscribers here are from the perspective of ipnlocal already called async. Updates #15160 Signed-off-by: Claus Lensbøl <claus@tailscale.com>
94 lines
3.7 KiB
Go
94 lines
3.7 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Package controlclient implements the client for the Tailscale
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// control plane.
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//
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// It handles authentication, port picking, and collects the local
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// network configuration.
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package controlclient
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import (
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"context"
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"tailscale.com/tailcfg"
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)
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// LoginFlags is a bitmask of options to change the behavior of Client.Login
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// and LocalBackend.
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type LoginFlags int
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const (
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LoginDefault = LoginFlags(0)
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LoginInteractive = LoginFlags(1 << iota) // force user login and key refresh
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LoginEphemeral // set RegisterRequest.Ephemeral
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// LocalBackendStartKeyOSNeutral instructs NewLocalBackend to start the
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// LocalBackend without any OS-dependent StateStore StartKey behavior.
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//
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// See https://github.com/tailscale/tailscale/issues/6973.
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LocalBackendStartKeyOSNeutral
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)
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// Client represents a client connection to the control server.
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// Currently this is done through a pair of polling https requests in
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// the Auto client, but that might change eventually.
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//
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// The Client must be comparable as it is used by the Observer to detect stale
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// clients.
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type Client interface {
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// Shutdown closes this session, which should not be used any further
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// afterwards.
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Shutdown()
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// Login begins an interactive or non-interactive login process.
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// Client will eventually call the Status callback with either a
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// LoginFinished flag (on success) or an auth URL (if further
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// interaction is needed). It merely sets the process in motion,
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// and doesn't wait for it to complete.
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Login(LoginFlags)
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// Logout starts a synchronous logout process. It doesn't return
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// until the logout operation has been completed.
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Logout(context.Context) error
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// SetPaused pauses or unpauses the controlclient activity as much
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// as possible, without losing its internal state, to minimize
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// unnecessary network activity.
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// TODO: It might be better to simply shutdown the controlclient and
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// make a new one when it's time to unpause.
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SetPaused(bool)
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// AuthCantContinue returns whether authentication is blocked. If it
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// is, you either need to visit the auth URL (previously sent in a
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// Status callback) or call the Login function appropriately.
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// TODO: this probably belongs in the Status itself instead.
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AuthCantContinue() bool
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// SetHostinfo changes the Hostinfo structure that will be sent in
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// subsequent node registration requests.
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// TODO: a server-side change would let us simply upload this
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// in a separate http request. It has nothing to do with the rest of
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// the state machine.
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SetHostinfo(*tailcfg.Hostinfo)
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// SetNetinfo changes the NetIinfo structure that will be sent in
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// subsequent node registration requests.
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// TODO: a server-side change would let us simply upload this
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// in a separate http request. It has nothing to do with the rest of
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// the state machine.
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SetNetInfo(*tailcfg.NetInfo)
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// SetTKAHead changes the TKA head hash value that will be sent in
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// subsequent netmap requests.
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SetTKAHead(headHash string)
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// UpdateEndpoints changes the Endpoint structure that will be sent
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// in subsequent node registration requests.
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// TODO: a server-side change would let us simply upload this
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// in a separate http request. It has nothing to do with the rest of
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// the state machine.
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UpdateEndpoints(endpoints []tailcfg.Endpoint)
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// ClientID returns the ClientID of a client. This ID is meant to
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// distinguish one client from another.
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ClientID() int64
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}
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// UserVisibleError is an error that should be shown to users.
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type UserVisibleError string
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func (e UserVisibleError) Error() string { return string(e) }
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func (e UserVisibleError) UserVisibleError() string { return string(e) }
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