Official Sentry Negroni Handler for Sentry-go SDK
go.dev: https://pkg.go.dev/github.com/getsentry/sentry-go/negroni
Example: https://github.com/getsentry/sentry-go/tree/master/_examples/negroni
Installation
go get github.com/getsentry/sentry-go/negroni
import (
"fmt"
"net/http"
"github.com/getsentry/sentry-go"
sentrynegroni "github.com/getsentry/sentry-go/negroni"
"github.com/urfave/negroni"
)
// To initialize Sentry's handler, you need to initialize Sentry itself beforehand
if err := sentry.Init(sentry.ClientOptions{
Dsn: "your-public-dsn",
}); err != nil {
fmt.Printf("Sentry initialization failed: %v\n", err)
}
// Then create your app
app := negroni.Classic()
// Once it's done, you can attach the handler as one of your middleware
app.Use(sentrynegroni.New(sentrynegroni.Options{}))
// Set up routes
mux := http.NewServeMux()
mux.HandleFunc("/", func(rw http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Hello world!")
})
app.UseHandler(mux)
// And run it
http.ListenAndServe(":3000", app)
Configuration
sentrynegroni
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 negroni.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 Negroni'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
Usage
sentrynegroni
attaches an instance of *sentry.Hub
(https://pkg.go.dev/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 to sentrynegroni
!
app := negroni.Classic()
app.Use(sentrynegroni.New(sentrynegroni.Options{
Repanic: true,
}))
app.Use(negroni.HandlerFunc(func(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
hub := sentry.GetHubFromContext(r.Context())
hub.Scope().SetTag("someRandomTag", "maybeYouNeedIt")
next(rw, r)
}))
mux := http.NewServeMux()
mux.HandleFunc("/", func(rw http.ResponseWriter, r *http.Request) {
hub := sentry.GetHubFromContext(r.Context())
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)
})
mux.HandleFunc("/foo", func(rw http.ResponseWriter, r *http.Request) {
// sentrynagroni 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")
})
app.UseHandler(mux)
http.ListenAndServe(":3000", app)
Accessing Request in BeforeSend
callback
sentry.Init(sentry.ClientOptions{
Dsn: "your-public-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
},
})
Using Negroni's PanicHandlerFunc
Option
Negroni provides an option called PanicHandlerFunc
, which lets you "plug-in" to its default Recovery
middleware.
sentrynegroni
exports a very barebones implementation, which utilizes it, so if you don't need anything else than just reporting panics to Sentry,
you can use it instead, as it's just one line of code!
You can still use BeforeSend
and event processors to modify data before delivering it to Sentry, using this method as well.
app := negroni.New()
recovery := negroni.NewRecovery()
recovery.PanicHandlerFunc = sentrynegroni.PanicHandlerFunc
app.Use(recovery)
mux := http.NewServeMux()
mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
panic("y tho")
})
app.UseHandler(mux)
http.ListenAndServe(":3000", app)