79 lines
2.0 KiB
Go
79 lines
2.0 KiB
Go
package common
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import (
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"context"
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"fmt"
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"github.com/certusone/wormhole/node/pkg/supervisor"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promauto"
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)
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var (
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ScissorsErrorsCaught = promauto.NewCounterVec(
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prometheus.CounterOpts{
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Name: "scissor_errors_caught",
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Help: "Total number of unhandled errors caught",
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}, []string{"name"})
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ScissorsPanicsCaught = promauto.NewCounterVec(
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prometheus.CounterOpts{
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Name: "scissor_panics_caught",
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Help: "Total number of panics caught",
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}, []string{"name"})
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)
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// Start a go routine with recovering from any panic by sending an error to a error channel
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func RunWithScissors(ctx context.Context, errC chan error, name string, runnable supervisor.Runnable) {
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ScissorsErrorsCaught.WithLabelValues(name).Add(0)
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ScissorsPanicsCaught.WithLabelValues(name).Add(0)
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go func() {
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defer func() {
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if r := recover(); r != nil {
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var err error
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switch x := r.(type) {
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case error:
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err = fmt.Errorf("%s: %w", name, x)
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default:
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err = fmt.Errorf("%s: %v", name, x)
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}
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// We don't want this to hang if the listener has already gone away.
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select {
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case errC <- err:
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default:
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}
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ScissorsPanicsCaught.WithLabelValues(name).Inc()
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}
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}()
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err := runnable(ctx)
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if err != nil {
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// We don't want this to hang if the listener has already gone away.
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select {
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case errC <- err:
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default:
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}
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ScissorsErrorsCaught.WithLabelValues(name).Inc()
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}
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}()
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}
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func WrapWithScissors(runnable supervisor.Runnable, name string) supervisor.Runnable {
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ScissorsErrorsCaught.WithLabelValues(name).Add(0)
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ScissorsPanicsCaught.WithLabelValues(name).Add(0)
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return func(ctx context.Context) (result error) {
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defer func() {
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if r := recover(); r != nil {
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switch x := r.(type) {
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case error:
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result = fmt.Errorf("%s: %w", name, x)
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default:
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result = fmt.Errorf("%s: %v", name, x)
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}
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ScissorsPanicsCaught.WithLabelValues(name).Inc()
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}
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}()
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return runnable(ctx)
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}
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}
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