mirror of https://github.com/knative/pkg.git
104 lines
2.8 KiB
Go
104 lines
2.8 KiB
Go
/*
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Copyright 2019 The Knative Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package metrics
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import (
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"bytes"
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"io/ioutil"
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"net/http"
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"net/url"
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"testing"
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"go.opencensus.io/stats/view"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/client-go/rest"
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"k8s.io/client-go/tools/metrics"
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"knative.dev/pkg/metrics/metricstest"
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)
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// clientFunc lets us implement rest.HTTPClient with a function matching
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// the signature of its Do method.
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type clientFunc struct {
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do func(*http.Request) (*http.Response, error)
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}
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var _ rest.HTTPClient = (*clientFunc)(nil)
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// Do implements rest.HTTPClient
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func (cf *clientFunc) Do(req *http.Request) (*http.Response, error) {
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return cf.do(req)
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}
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// ClientFunc turns a method matching the signature of rest.HTTPClient's
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// Do() method into an implementation of rest.HTTPClient.
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func ClientFunc(f func(*http.Request) (*http.Response, error)) rest.HTTPClient {
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return &clientFunc{do: f}
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}
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func TestClientMetrics(t *testing.T) {
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cp := &ClientProvider{
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Latency: newFloat64("latency"),
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Result: newInt64("result"),
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}
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metrics.Register(cp.NewLatencyMetric(), cp.NewResultMetric())
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// Reset the metrics configuration to avoid leaked state from other tests.
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setCurMetricsConfig(nil)
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views := cp.DefaultViews()
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if got, want := len(views), 2; got != want {
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t.Errorf("len(DefaultViews()) = %d, want %d", got, want)
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}
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if err := view.Register(views...); err != nil {
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t.Errorf("view.Register() = %v", err)
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}
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defer view.Unregister(views...)
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// No stats have been reported yet.
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metricstest.CheckStatsNotReported(t, "latency", "result")
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base := &url.URL{
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Scheme: "http",
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Host: "api.mattmoor.dev",
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}
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config := rest.ContentConfig{
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ContentType: "application/json",
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GroupVersion: &schema.GroupVersion{
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Group: "testing.knative.dev",
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Version: "v1alpha1",
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},
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}
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client := ClientFunc(func(req *http.Request) (*http.Response, error) {
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return &http.Response{
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StatusCode: http.StatusOK,
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Body: ioutil.NopCloser(bytes.NewBufferString("hi")),
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}, nil
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})
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// When we send rest requests, we should trigger the metrics setup above.
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req := rest.NewRequest(client, http.MethodGet, base, "/testing.knative.dev/v1alpha1",
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config, rest.Serializers{}, nil, nil, 0)
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result := req.Do()
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if err := result.Error(); err != nil {
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t.Errorf("Do() = %v", err)
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}
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// Now we have stats reported!
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metricstest.CheckStatsReported(t, "latency", "result")
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}
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