net/http

This page shows how to add Sentry instrumentation to programs using the net/http package.

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

GoDoc-style API documentation is also available.

Install

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$ go get github.com/getsentry/sentry-go/http
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import (
	"fmt"
	"net/http"

	"github.com/getsentry/sentry-go"
	sentryhttp "github.com/getsentry/sentry-go/http"
)

// To initialize Sentry's handler, you need to initialize Sentry itself beforehand
if err := sentry.Init(sentry.ClientOptions{
	Dsn: "https://examplePublicKey@o0.ingest.sentry.io/0",
}); err != nil {
	fmt.Printf("Sentry initialization failed: %v\n", err)
}

// Create an instance of sentryhttp
sentryHandler := sentryhttp.New(sentryhttp.Options{})

// Once it's done, you can set up routes and attach the handler as one of your middleware
http.Handle("/", sentryHandler.Handle(&handler{}))
http.HandleFunc("/foo", sentryHandler.HandleFunc(func(rw http.ResponseWriter, r *http.Request) {
	panic("y tho")
}))

fmt.Println("Listening and serving HTTP on :3000")

// And run it
if err := http.ListenAndServe(":3000", nil); err != nil {
	panic(err)
}

Configure

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

Currently it respects 3 options:

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// Whether Sentry should repanic after recovery, in most cases it should be set to true,
// and you should gracefully handle http responses.
Repanic bool
// Whether you want to block the request before moving forward with the response.
// Useful, when you want to restart the process after it panics.
WaitForDelivery bool
// Timeout for the event delivery requests.
Timeout time.Duration

Usage

sentryhttp attaches an instance of *sentry.Hub (https://godoc.org/github.com/getsentry/sentry-go#Hub) to the request's context, which makes it available throughout the rest of the request's lifetime. You can access it by using the sentry.GetHubFromContext() method on the request itself 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 sentryhttp!

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type handler struct{}

func (h *handler) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
	if hub := sentry.GetHubFromContext(r.Context()); hub != nil {
		hub.WithScope(func(scope *sentry.Scope) {
			scope.SetExtra("unwantedQuery", "someQueryDataMaybe")
			hub.CaptureMessage("User provided unwanted query string, but we recovered just fine")
		})
	}
	rw.WriteHeader(http.StatusOK)
}

func enhanceSentryEvent(handler http.HandlerFunc) http.HandlerFunc {
	return func(rw http.ResponseWriter, r *http.Request) {
		if hub := sentry.GetHubFromContext(r.Context()); hub != nil {
			hub.Scope().SetTag("someRandomTag", "maybeYouNeedIt")
		}
		handler(rw, r)
	}
}

// Later in the code

sentryHandler := sentryhttp.New(sentryhttp.Options{
	Repanic: true,
})

http.Handle("/", sentryHandler.Handle(&handler{}))
http.HandleFunc("/foo", sentryHandler.HandleFunc(
	enhanceSentryEvent(func(rw http.ResponseWriter, r *http.Request) {
		panic("y tho")
	}),
))

fmt.Println("Listening and serving HTTP on :3000")

if err := http.ListenAndServe(":3000", nil); err != nil {
	panic(err)
}

Accessing Request in BeforeSend callback

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sentry.Init(sentry.ClientOptions{
	Dsn: "https://examplePublicKey@o0.ingest.sentry.io/0",
	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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