mirror of https://github.com/tailscale/tailscale/
ssh/tailssh: break a method into half in prep for testing
And add a private context type in the process. Updates #3802 Change-Id: I257187f4cfb0f2248d95b81c1dfe0911ef203b60 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>pull/4026/head
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// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package tailssh
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import (
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"sync"
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"time"
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)
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// sshContext is the context.Context implementation we use for SSH
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// that adds a CloseWithError method. Otherwise it's just a normalish
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// Context.
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type sshContext struct {
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mu sync.Mutex
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closed bool
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done chan struct{}
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err error
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}
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func newSSHContext() *sshContext {
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return &sshContext{done: make(chan struct{})}
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}
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func (ctx *sshContext) CloseWithError(err error) {
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ctx.mu.Lock()
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defer ctx.mu.Unlock()
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if ctx.closed {
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return
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}
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ctx.closed = true
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ctx.err = err
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close(ctx.done)
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}
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func (ctx *sshContext) Err() error {
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ctx.mu.Lock()
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defer ctx.mu.Unlock()
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return ctx.err
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}
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func (ctx *sshContext) Done() <-chan struct{} { return ctx.done }
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func (ctx *sshContext) Deadline() (deadline time.Time, ok bool) { return }
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func (ctx *sshContext) Value(interface{}) interface{} { return nil }
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// userVisibleError is a wrapper around an error that implements
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// SSHTerminationError, so msg is written to their session.
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type userVisibleError struct {
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msg string
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error
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}
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func (ue userVisibleError) SSHTerminationMessage() string { return ue.msg }
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// SSHTerminationError is implemented by errors that terminate an SSH
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// session and should be written to user's sessions.
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type SSHTerminationError interface {
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error
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SSHTerminationMessage() string
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}
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