This page shows how to use the Martini framework with Sentry.

For a quick reference, there is a complete example at the Go SDK source code repository.

Go Dev-style API documentation is also available.

go get
import (

	sentrymartini ""

// To initialize Sentry's handler, you need to initialize Sentry itself beforehand
if err := sentry.Init(sentry.ClientOptions{
	Dsn: "",
	EnableTracing: true,
	// Set TracesSampleRate to 1.0 to capture 100%
	// of transactions for performance monitoring.
	// We recommend adjusting this value in production,
	TracesSampleRate: 1.0,
}); err != nil {
	fmt.Printf("Sentry initialization failed: %v\n", err)

// Then create your app
app := martini.Classic()

// Once it's done, you can attach the handler as one of your middleware

// Set up routes
app.Get("/", func() string {
	return "Hello world!"

// And run it

sentrymartini accepts a struct of Options that allows you to configure how the handler will behave.

Currently it respects 3 options:

// Whether Sentry should repanic after recovery, in most cases it should be set to true,
// as martini.Classic includes its own Recovery middleware that handles http responses.
Repanic bool
// Whether you want to block the request before moving forward with the response.
// Because Martini's default `Recovery` handler doesn't restart the application,
// it's safe to either skip this option or set it to `false`.
WaitForDelivery bool
// Timeout for the event delivery requests.
Timeout time.Duration

sentrymartini maps an instance of *sentry.Hub ( as one of the services available throughout the rest of the request's lifetime. You can access it by providing a hub *sentry.Hub parameter in any of your proceeding middleware and routes. And it should be used instead of the global sentry.CaptureMessage, sentry.CaptureException, or any other calls, as it keeps the separation of data between the requests.

Keep in mind that *sentry.Hub won't be available in middleware attached before sentrymartini!

app := martini.Classic()

	Repanic: true,

app.Use(func(rw http.ResponseWriter, r *http.Request, c martini.Context, hub *sentry.Hub) {
	hub.Scope().SetTag("someRandomTag", "maybeYouNeedIt")

app.Get("/", func(rw http.ResponseWriter, r *http.Request, hub *sentry.Hub) {
	if someCondition {
		hub.WithScope(func (scope *sentry.Scope) {
			scope.SetExtra("unwantedQuery", rw.URL.RawQuery)
			hub.CaptureMessage("User provided unwanted query string, but we recovered just fine")

app.Get("/foo", func() string {
	// sentrymartini handler will catch it just fine. Also, because we attached "someRandomTag"
	// in the middleware before, it will be sent through as well
	panic("y tho")


	Dsn: "",
	BeforeSend: func(event *sentry.Event, hint *sentry.EventHint) *sentry.Event {
		if hint.Context != nil {
			if req, ok := hint.Context.Value(sentry.RequestContextKey).(*http.Request); ok {
				// You have access to the original Request here

		return event
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