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tailscale/wgengine/watchdog.go

84 lines
2.1 KiB
Go

// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package wgengine
import (
"bytes"
"log"
"runtime/pprof"
"time"
"github.com/tailscale/wireguard-go/wgcfg"
"tailscale.com/wgengine/filter"
)
// NewWatchdog wraps an Engine and makes sure that all methods complete
// within a reasonable amount of time.
//
// If they do not, the watchdog crashes the process.
func NewWatchdog(e Engine) Engine {
return &watchdogEngine{
wrap: e,
logf: log.Printf,
fatalf: log.Fatalf,
maxWait: 45 * time.Second,
}
}
type watchdogEngine struct {
wrap Engine
logf func(format string, args ...interface{})
fatalf func(format string, args ...interface{})
maxWait time.Duration
}
func (e *watchdogEngine) watchdogErr(name string, fn func() error) error {
errCh := make(chan error)
go func() {
errCh <- fn()
}()
t := time.NewTimer(e.maxWait)
select {
case err := <-errCh:
t.Stop()
return err
case <-t.C:
buf := new(bytes.Buffer)
pprof.Lookup("goroutine").WriteTo(buf, 1)
e.logf("wgengine watchdog stacks:\n%s", buf.String())
e.fatalf("wgengine: watchdog timeout on %s", name)
return nil
}
}
func (e *watchdogEngine) watchdog(name string, fn func()) {
e.watchdogErr(name, func() error {
fn()
return nil
})
}
func (e *watchdogEngine) Reconfig(cfg *wgcfg.Config, dnsDomains []string) error {
return e.watchdogErr("Reconfig", func() error { return e.wrap.Reconfig(cfg, dnsDomains) })
}
func (e *watchdogEngine) SetFilter(filt *filter.Filter) {
e.watchdog("SetFilter", func() { e.wrap.SetFilter(filt) })
}
func (e *watchdogEngine) SetStatusCallback(cb StatusCallback) {
e.watchdog("SetStatusCallback", func() { e.wrap.SetStatusCallback(cb) })
}
func (e *watchdogEngine) RequestStatus() {
e.watchdog("RequestStatus", func() { e.wrap.RequestStatus() })
}
func (e *watchdogEngine) LinkChange(isExpensive bool) {
e.watchdog("LinkChange", func() { e.wrap.LinkChange(isExpensive) })
}
func (e *watchdogEngine) Close() {
e.watchdog("Close", e.wrap.Close)
}
func (e *watchdogEngine) Wait() {
e.wrap.Wait()
}