diff --git a/Gopkg.lock b/Gopkg.lock
index fc4304d..ee3f8b6 100644
--- a/Gopkg.lock
+++ b/Gopkg.lock
@@ -1,6 +1,12 @@
 # This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
 
 
+[[projects]]
+  name = "github.com/Luzifer/go_helpers"
+  packages = ["str"]
+  revision = "94b91ff63a5db8e22c4d121e6c5c17b44135be4d"
+  version = "v2.5.0"
+
 [[projects]]
   name = "github.com/Luzifer/rconfig"
   packages = ["."]
@@ -124,6 +130,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "9e9921ed070369ec5c66299d9403b1d7dd184332dbf7f7e36c5d1ff493b88216"
+  inputs-digest = "e443e1ce42c6da5794decc9e50a89f0cda1f1e191c2c5582f2443c0342cb6e37"
   solver-name = "gps-cdcl"
   solver-version = 1
diff --git a/Gopkg.toml b/Gopkg.toml
index 9479b2a..9952641 100644
--- a/Gopkg.toml
+++ b/Gopkg.toml
@@ -25,6 +25,10 @@
 #   unused-packages = true
 
 
+[[constraint]]
+  name = "github.com/Luzifer/go_helpers"
+  version = "2.5.0"
+
 [[constraint]]
   name = "github.com/Luzifer/rconfig"
   version = "1.2.0"
diff --git a/cert.go b/cert.go
index df301a6..e2ab336 100644
--- a/cert.go
+++ b/cert.go
@@ -8,6 +8,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/Luzifer/go_helpers/str"
 	log "github.com/sirupsen/logrus"
 )
 
@@ -31,11 +32,10 @@ func (p probeResult) String() string {
 		return "Certificate invalid / intermediate certificates not present"
 	case certificateNotFound:
 		return "Did not find a certificate valid for this domain"
-	case generalFailure:
+
+	default:
 		return "Something went wrong in the request"
 	}
-
-	return "" // This does not happen.
 }
 
 func checkCertificate(probeURL *url.URL) (probeResult, *x509.Certificate) {
@@ -65,7 +65,7 @@ func checkCertificate(probeURL *url.URL) (probeResult, *x509.Certificate) {
 
 	for _, cert := range resp.TLS.PeerCertificates {
 		wildHost := "*" + host[strings.Index(host, "."):]
-		if !inSlice(cert.DNSNames, host) && !inSlice(cert.DNSNames, wildHost) {
+		if !str.StringInSlice(host, cert.DNSNames) && !str.StringInSlice(wildHost, cert.DNSNames) {
 			intermediatePool.AddCert(cert)
 			continue
 		}
diff --git a/http.go b/http.go
index 76f71bb..2f70d34 100644
--- a/http.go
+++ b/http.go
@@ -11,7 +11,7 @@ import (
 )
 
 func htmlHandler(res http.ResponseWriter, r *http.Request) {
-	tplsrc, _ := Asset("display.html")
+	tplsrc := MustAsset("display.html")
 
 	template, err := pongo2.FromString(string(tplsrc))
 	if err != nil {
diff --git a/main.go b/main.go
index 3c4e55e..45d7277 100644
--- a/main.go
+++ b/main.go
@@ -1,4 +1,4 @@
-package main // import "github.com/Luzifer/promcertcheck"
+package main
 
 import (
 	"crypto/tls"
@@ -44,6 +44,27 @@ type probeMonitor struct {
 	Certificate *x509.Certificate
 }
 
+func (p *probeMonitor) Update(status probeResult, cert *x509.Certificate) error {
+	p.Status = status
+	p.Certificate = cert
+
+	p.updatePrometheus(status, cert)
+
+	return nil
+}
+
+func (p probeMonitor) updatePrometheus(status probeResult, cert *x509.Certificate) {
+	if cert != nil {
+		p.Expires.Set(float64(cert.NotAfter.UTC().Unix()))
+	}
+
+	if status == certificateExpiresSoon || status == certificateOK {
+		p.IsValid.Set(1)
+	} else {
+		p.IsValid.Set(0)
+	}
+}
+
 func init() {
 	if err := rconfig.Parse(&cfg); err != nil {
 		log.Fatalf("Unable to parse CLI parameters: %s", err)
@@ -174,29 +195,9 @@ func refreshCertificateStatus() {
 		}
 		probeLog.Debug("Probe finished")
 
-		if verifyCert != nil {
-			probeMonitors[probeURL.Host].Expires.Set(float64(verifyCert.NotAfter.UTC().Unix()))
-		}
-
-		switch verificationResult {
-		case certificateExpiresSoon, certificateOK:
-			probeMonitors[probeURL.Host].IsValid.Set(1)
-		case certificateInvalid, certificateNotFound:
-			probeMonitors[probeURL.Host].IsValid.Set(0)
-		default:
-			probeMonitors[probeURL.Host].IsValid.Set(0)
-		}
-		probeMonitors[probeURL.Host].Status = verificationResult
-		probeMonitors[probeURL.Host].Certificate = verifyCert
-	}
-}
-
-func inSlice(slice []string, needle string) bool {
-	for _, i := range slice {
-		if i == needle {
-			return true
+		if err := probeMonitors[probeURL.Host].Update(verificationResult, verifyCert); err != nil {
+			probeLog.WithError(err).Error("Unable to update probe state")
+			return
 		}
 	}
-
-	return false
 }
diff --git a/vendor/github.com/Luzifer/go_helpers/str/slice.go b/vendor/github.com/Luzifer/go_helpers/str/slice.go
new file mode 100644
index 0000000..f93af69
--- /dev/null
+++ b/vendor/github.com/Luzifer/go_helpers/str/slice.go
@@ -0,0 +1,21 @@
+package str
+
+// AppendIfMissing adds a string to a slice when it's not present yet
+func AppendIfMissing(slice []string, s string) []string {
+	for _, e := range slice {
+		if e == s {
+			return slice
+		}
+	}
+	return append(slice, s)
+}
+
+// StringInSlice checks for the existence of a string in the slice
+func StringInSlice(a string, list []string) bool {
+	for _, b := range list {
+		if b == a {
+			return true
+		}
+	}
+	return false
+}