Add Sentry support.

src/main.go

@@ -72,6 +72,7 @@ func serve(listener net.Listener, handler http.Handler) {
 
 func main() {
 	InitObservability()
+	defer FiniObservability()
 
 	printConfigEnvVars := flag.Bool("print-config-env-vars", false,
 		"print every recognized configuration environment variable and exit")

src/observe.go

@@ -1,27 +1,65 @@
 package main
 
 import (
+	"log"
 	"net/http"
 	"os"
 	"runtime/debug"
+	"time"
 
 	"github.com/honeybadger-io/honeybadger-go"
+
+	"github.com/getsentry/sentry-go"
+	sentryhttp "github.com/getsentry/sentry-go/http"
 )
 
 func hasHoneybadger() bool {
 	return os.Getenv("HONEYBADGER_API_KEY") != ""
 }
 
+func hasSentry() bool {
+	return os.Getenv("SENTRY_DSN") != ""
+}
+
 func InitObservability() {
+	environment := "development"
+	if value, ok := os.LookupEnv("ENVIRONMENT"); ok {
+		environment = value
+	}
+
 	if hasHoneybadger() {
-		honeybadger.Configure(honeybadger.Configuration{})
+		honeybadger.Configure(honeybadger.Configuration{
+			Env: environment,
+		})
 		debug.SetPanicOnFault(true)
 	}
+
+	if hasSentry() {
+		options := sentry.ClientOptions{}
+		options.Environment = environment
+		options.Dsn = os.Getenv("SENTRY_DSN")
+		if err := sentry.Init(options); err != nil {
+			log.Fatalf("sentry: %s\n", err)
+		}
+	}
+}
+
+func FiniObservability() {
+	if hasSentry() {
+		sentry.Flush(2 * time.Second)
+	}
 }
 
 func ObserveHTTPHandler(handler http.Handler) http.Handler {
 	if hasHoneybadger() {
 		handler = honeybadger.Handler(handler)
 	}
+
+	if hasSentry() {
+		handler = sentryhttp.New(sentryhttp.Options{
+			Repanic: true,
+		}).Handle(handler)
+	}
+
 	return handler
 }