Added TLS Handshake metrics

artemis.go

@@ -37,6 +37,8 @@ func (t *Tracer) RequestWithTracer(request *http.Request) *http.Request {
 		DNSDone:              httpTracer.DNSDone,
 		ConnectStart:         httpTracer.ConnStart,
 		ConnectDone:          httpTracer.ConnDone,
+		TLSHandshakeStart:    httpTracer.TLSHandshakeStart,
+		TLSHandshakeDone:     httpTracer.TLSHandshakeDone,
 		WroteHeaders:         httpTracer.WroteHeaders,
 		WroteRequest:         httpTracer.WroteRequest,
 	}

metrics.go

@@ -16,6 +16,7 @@ type TracingMetrics struct {
 	ConnectionHandshakeDurationSeconds *prometheus.HistogramVec
 	HeaderWriteDrurationSeconds        *prometheus.HistogramVec
 	RequestWriteDurationSeconds        *prometheus.HistogramVec
+	TLSHandshakeDurationSeconds        *prometheus.HistogramVec
 }
 
 var (
@@ -68,6 +69,12 @@ func NewTracingMetrics(namespace string) *TracingMetrics {
 			Help:      "HTTP Connection Handshake Duration",
 			Buckets:   SmallDurationBuckets,
 		}, []string{MethodLabel, UrlLabel}),
+		TLSHandshakeDurationSeconds: prometheus.NewHistogramVec(prometheus.HistogramOpts{
+			Namespace: namespace,
+			Name:      "http_tls_handshake_duration_seconds",
+			Help:      "HTTP TLS Handshake Duration",
+			Buckets:   SmallDurationBuckets,
+		}, []string{MethodLabel, UrlLabel}),
 		HeaderWriteDrurationSeconds: prometheus.NewHistogramVec(prometheus.HistogramOpts{
 			Namespace: namespace,
 			Name:      "http_header_write_duration_seconds",
@@ -115,6 +122,11 @@ func (tm *TracingMetrics) ConnectionHandshakeDurationSecondsMetric(connStartTime
 	tm.ConnectionHandshakeDurationSeconds.With(prometheus.Labels{MethodLabel: method, UrlLabel: url}).Observe(handshakeDuration.Seconds())
 }
 
+func (tm *TracingMetrics) TLSHandshakeDurationSecondsMetric(connStartTime time.Time, method, url string) {
+	handshakeDuration := time.Since(connStartTime)
+	tm.TLSHandshakeDurationSeconds.With(prometheus.Labels{MethodLabel: method, UrlLabel: url}).Observe(handshakeDuration.Seconds())
+}
+
 func (tm *TracingMetrics) HeaderWriteDrurationSecondsMetric(startTime time.Time, method, url string) {
 	headerWriteDuration := time.Since(startTime)
 	tm.HeaderWriteDrurationSeconds.With(prometheus.Labels{MethodLabel: method, UrlLabel: url}).Observe(headerWriteDuration.Seconds())
@@ -133,6 +145,7 @@ func (tm *TracingMetrics) GetCollectors() []prometheus.Collector {
 		tm.DNSLookupDurationSeconds,
 		tm.DNSCoalesced,
 		tm.ConnectionHandshakeDurationSeconds,
+		tm.TLSHandshakeDurationSeconds,
 		tm.HeaderWriteDrurationSeconds,
 		tm.RequestWriteDurationSeconds,
 	}

tracer.go

@@ -1,17 +1,19 @@
 package artemis
 
 import (
+	"crypto/tls"
 	"net/http/httptrace"
 	"time"
 )
 
 type HttpTracer struct {
 	RequestStartTime time.Time
 
-	GetConnTime      time.Time
-	DNSStartTime     time.Time
-	DNSHost          string
-	ConnectStartTime time.Time
+	GetConnTime           time.Time
+	DNSStartTime          time.Time
+	DNSHost               string
+	ConnectStartTime      time.Time
+	TLSHandshakeStartTime time.Time
 
 	Metrics *TracingMetrics
 
@@ -69,6 +71,14 @@ func (ht *HttpTracer) ConnDone(network, addr string, err error) {
 	ht.Metrics.ConnectionHandshakeDurationSecondsMetric(ht.ConnectStartTime, ht.ReqMethod, ht.ReqURL)
 }
 
+func (ht *HttpTracer) TLSHandshakeStart() {
+	ht.TLSHandshakeStartTime = time.Now()
+}
+
+func (ht *HttpTracer) TLSHandshakeDone(tls.ConnectionState, error) {
+	ht.Metrics.TLSHandshakeDurationSecondsMetric(ht.TLSHandshakeStartTime, ht.ReqMethod, ht.ReqURL)
+}
+
 func (ht *HttpTracer) WroteHeaders() {
 	ht.Metrics.HeaderWriteDrurationSecondsMetric(ht.RequestStartTime, ht.ReqMethod, ht.ReqURL)
 }