163 lines
3.5 KiB
Go
163 lines
3.5 KiB
Go
package safe
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import (
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"context"
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"fmt"
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"runtime/debug"
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"sync"
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"github.com/cenk/backoff"
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"github.com/containous/traefik/log"
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)
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type routine struct {
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goroutine func(chan bool)
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stop chan bool
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}
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type routineCtx func(ctx context.Context)
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// Pool is a pool of go routines
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type Pool struct {
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routines []routine
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routinesCtx []routineCtx
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waitGroup sync.WaitGroup
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lock sync.Mutex
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baseCtx context.Context
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baseCancel context.CancelFunc
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ctx context.Context
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cancel context.CancelFunc
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}
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// NewPool creates a Pool
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func NewPool(parentCtx context.Context) *Pool {
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baseCtx, baseCancel := context.WithCancel(parentCtx)
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ctx, cancel := context.WithCancel(baseCtx)
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return &Pool{
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baseCtx: baseCtx,
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baseCancel: baseCancel,
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ctx: ctx,
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cancel: cancel,
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}
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}
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// Ctx returns main context
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func (p *Pool) Ctx() context.Context {
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return p.baseCtx
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}
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//AddGoCtx adds a recoverable goroutine with a context without starting it
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func (p *Pool) AddGoCtx(goroutine routineCtx) {
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p.lock.Lock()
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p.routinesCtx = append(p.routinesCtx, goroutine)
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p.lock.Unlock()
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}
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//GoCtx starts a recoverable goroutine with a context
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func (p *Pool) GoCtx(goroutine routineCtx) {
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p.lock.Lock()
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p.routinesCtx = append(p.routinesCtx, goroutine)
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p.waitGroup.Add(1)
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Go(func() {
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goroutine(p.ctx)
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p.waitGroup.Done()
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})
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p.lock.Unlock()
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}
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// Go starts a recoverable goroutine, and can be stopped with stop chan
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func (p *Pool) Go(goroutine func(stop chan bool)) {
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p.lock.Lock()
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newRoutine := routine{
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goroutine: goroutine,
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stop: make(chan bool, 1),
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}
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p.routines = append(p.routines, newRoutine)
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p.waitGroup.Add(1)
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Go(func() {
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goroutine(newRoutine.stop)
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p.waitGroup.Done()
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})
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p.lock.Unlock()
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}
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// Stop stops all started routines, waiting for their termination
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func (p *Pool) Stop() {
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p.lock.Lock()
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defer p.lock.Unlock()
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p.cancel()
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for _, routine := range p.routines {
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routine.stop <- true
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}
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p.waitGroup.Wait()
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for _, routine := range p.routines {
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close(routine.stop)
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}
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}
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// Cleanup releases resources used by the pool, and should be called when the pool will no longer be used
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func (p *Pool) Cleanup() {
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p.Stop()
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p.lock.Lock()
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defer p.lock.Unlock()
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p.baseCancel()
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}
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// Start starts all stopped routines
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func (p *Pool) Start() {
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p.lock.Lock()
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defer p.lock.Unlock()
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p.ctx, p.cancel = context.WithCancel(p.baseCtx)
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for i := range p.routines {
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p.waitGroup.Add(1)
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p.routines[i].stop = make(chan bool, 1)
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Go(func() {
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p.routines[i].goroutine(p.routines[i].stop)
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p.waitGroup.Done()
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})
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}
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for _, routine := range p.routinesCtx {
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p.waitGroup.Add(1)
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Go(func() {
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routine(p.ctx)
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p.waitGroup.Done()
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})
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}
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}
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// Go starts a recoverable goroutine
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func Go(goroutine func()) {
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GoWithRecover(goroutine, defaultRecoverGoroutine)
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}
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// GoWithRecover starts a recoverable goroutine using given customRecover() function
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func GoWithRecover(goroutine func(), customRecover func(err interface{})) {
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go func() {
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defer func() {
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if err := recover(); err != nil {
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customRecover(err)
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}
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}()
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goroutine()
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}()
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}
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func defaultRecoverGoroutine(err interface{}) {
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log.Errorf("Error in Go routine: %s", err)
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debug.PrintStack()
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}
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// OperationWithRecover wrap a backoff operation in a Recover
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func OperationWithRecover(operation backoff.Operation) backoff.Operation {
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return func() (err error) {
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defer func() {
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if res := recover(); res != nil {
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defaultRecoverGoroutine(res)
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err = fmt.Errorf("Panic in operation: %s", err)
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}
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}()
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return operation()
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}
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}
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