mirror of
https://github.com/tailscale/tailscale.git
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84 lines
2.1 KiB
Go
84 lines
2.1 KiB
Go
// Copyright (c) 2020 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 wgengine
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import (
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"log"
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"runtime/pprof"
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"strings"
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"time"
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"github.com/tailscale/wireguard-go/wgcfg"
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"tailscale.com/wgengine/filter"
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)
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// NewWatchdog wraps an Engine and makes sure that all methods complete
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// within a reasonable amount of time.
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//
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// If they do not, the watchdog crashes the process.
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func NewWatchdog(e Engine) Engine {
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return &watchdogEngine{
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wrap: e,
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logf: log.Printf,
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fatalf: log.Fatalf,
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maxWait: 45 * time.Second,
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}
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}
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type watchdogEngine struct {
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wrap Engine
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logf func(format string, args ...interface{})
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fatalf func(format string, args ...interface{})
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maxWait time.Duration
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}
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func (e *watchdogEngine) watchdogErr(name string, fn func() error) error {
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errCh := make(chan error)
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go func() {
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errCh <- fn()
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}()
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t := time.NewTimer(e.maxWait)
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select {
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case err := <-errCh:
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t.Stop()
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return err
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case <-t.C:
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buf := new(strings.Builder)
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pprof.Lookup("goroutine").WriteTo(buf, 1)
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e.logf("wgengine watchdog stacks:\n%s", buf.String())
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e.fatalf("wgengine: watchdog timeout on %s", name)
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return nil
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}
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}
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func (e *watchdogEngine) watchdog(name string, fn func()) {
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e.watchdogErr(name, func() error {
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fn()
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return nil
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})
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}
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func (e *watchdogEngine) Reconfig(cfg *wgcfg.Config, dnsDomains []string) error {
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return e.watchdogErr("Reconfig", func() error { return e.wrap.Reconfig(cfg, dnsDomains) })
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}
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func (e *watchdogEngine) SetFilter(filt *filter.Filter) {
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e.watchdog("SetFilter", func() { e.wrap.SetFilter(filt) })
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}
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func (e *watchdogEngine) SetStatusCallback(cb StatusCallback) {
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e.watchdog("SetStatusCallback", func() { e.wrap.SetStatusCallback(cb) })
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}
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func (e *watchdogEngine) RequestStatus() {
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e.watchdog("RequestStatus", func() { e.wrap.RequestStatus() })
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}
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func (e *watchdogEngine) LinkChange(isExpensive bool) {
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e.watchdog("LinkChange", func() { e.wrap.LinkChange(isExpensive) })
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}
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func (e *watchdogEngine) Close() {
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e.watchdog("Close", e.wrap.Close)
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}
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func (e *watchdogEngine) Wait() {
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e.wrap.Wait()
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}
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