panic.go

package serviceability

import (
	"strings"
	"time"

	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
	"github.com/golang/glog"
)

// BehaviorOnPanic is a helper for setting the crash mode of OpenShift when a panic is caught.
// It returns a function that should be the defer handler for the caller.
func BehaviorOnPanic(mode string) (fn func()) {
	fn = func() {}
	switch {
	case mode == "crash":
		glog.Infof("OpenShift will terminate as soon as a panic occurs.")
		util.ReallyCrash = true
	case strings.HasPrefix(mode, "sentry:"):
		url := strings.TrimPrefix(mode, "sentry:")
		m, err := NewSentryMonitor(url)
		if err != nil {
			glog.Errorf("Unable to start Sentry for panic tracing: %v", err)
			return
		}
		glog.Infof("OpenShift will log all panics and errors to Sentry.")
		util.PanicHandlers = append(util.PanicHandlers, m.CapturePanic)
		util.ErrorHandlers = append(util.ErrorHandlers, m.CaptureError)
		fn = func() {
			if r := recover(); r != nil {
				m.CapturePanicAndWait(r, 2*time.Second)
				panic(r)
			}
		}
	case len(mode) == 0:
		// default panic behavior
	default:
		glog.Errorf("Unrecognized panic behavior")
	}
	return
}