80 lines
1.7 KiB
Go
80 lines
1.7 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/cenkalti/backoff/v4"
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"github.com/traefik/traefik/v2/pkg/log"
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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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waitGroup sync.WaitGroup
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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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ctx, cancel := context.WithCancel(parentCtx)
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return &Pool{
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ctx: ctx,
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cancel: cancel,
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}
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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.waitGroup.Add(1)
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Go(func() {
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defer p.waitGroup.Done()
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goroutine(p.ctx)
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})
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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.cancel()
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p.waitGroup.Wait()
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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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logger := log.WithoutContext()
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logger.Errorf("Error in Go routine: %s", err)
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logger.Errorf("Stack: %s", debug.Stack())
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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: %w", 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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