traefik/pkg/middlewares/metrics/metrics_test.go

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2019-07-18 19:36:05 +00:00
package metrics
import (
"net/http"
"net/http/httptest"
"reflect"
"testing"
"github.com/go-kit/kit/metrics"
"github.com/stretchr/testify/assert"
2019-07-18 19:36:05 +00:00
)
// CollectingCounter is a metrics.Counter implementation that enables access to the CounterValue and LastLabelValues.
type CollectingCounter struct {
CounterValue float64
LastLabelValues []string
}
// With is there to satisfy the metrics.Counter interface.
func (c *CollectingCounter) With(labelValues ...string) metrics.Counter {
c.LastLabelValues = labelValues
return c
}
// Add is there to satisfy the metrics.Counter interface.
func (c *CollectingCounter) Add(delta float64) {
c.CounterValue += delta
}
func TestMetricsRetryListener(t *testing.T) {
req := httptest.NewRequest(http.MethodGet, "/", nil)
retryMetrics := newCollectingRetryMetrics()
retryListener := NewRetryListener(retryMetrics, "serviceName")
retryListener.Retried(req, 1)
retryListener.Retried(req, 2)
wantCounterValue := float64(2)
if retryMetrics.retriesCounter.CounterValue != wantCounterValue {
t.Errorf("got counter value of %f, want %f", retryMetrics.retriesCounter.CounterValue, wantCounterValue)
}
wantLabelValues := []string{"service", "serviceName"}
if !reflect.DeepEqual(retryMetrics.retriesCounter.LastLabelValues, wantLabelValues) {
t.Errorf("wrong label values %v used, want %v", retryMetrics.retriesCounter.LastLabelValues, wantLabelValues)
}
}
// collectingRetryMetrics is an implementation of the retryMetrics interface that can be used inside tests to collect the times Add() was called.
type collectingRetryMetrics struct {
retriesCounter *CollectingCounter
}
func newCollectingRetryMetrics() *collectingRetryMetrics {
return &collectingRetryMetrics{retriesCounter: &CollectingCounter{}}
}
func (m *collectingRetryMetrics) ServiceRetriesCounter() metrics.Counter {
return m.retriesCounter
}
type rwWithCloseNotify struct {
*httptest.ResponseRecorder
}
func (r *rwWithCloseNotify) CloseNotify() <-chan bool {
panic("implement me")
}
func TestCloseNotifier(t *testing.T) {
testCases := []struct {
rw http.ResponseWriter
desc string
implementsCloseNotifier bool
}{
{
rw: httptest.NewRecorder(),
desc: "does not implement CloseNotifier",
implementsCloseNotifier: false,
},
{
rw: &rwWithCloseNotify{httptest.NewRecorder()},
desc: "implements CloseNotifier",
implementsCloseNotifier: true,
},
}
for _, test := range testCases {
test := test
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
_, ok := test.rw.(http.CloseNotifier)
assert.Equal(t, test.implementsCloseNotifier, ok)
rw := newResponseRecorder(test.rw)
_, impl := rw.(http.CloseNotifier)
assert.Equal(t, test.implementsCloseNotifier, impl)
})
}
}