122 lines
3.4 KiB
Go
122 lines
3.4 KiB
Go
// Copyright 2014 The Prometheus 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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package prometheus
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import (
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"net/http"
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"net/http/httptest"
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"testing"
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"time"
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dto "github.com/prometheus/client_model/go"
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)
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type respBody string
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func (b respBody) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusTeapot)
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w.Write([]byte(b))
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}
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func TestInstrumentHandler(t *testing.T) {
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defer func(n nower) {
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now = n.(nower)
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}(now)
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instant := time.Now()
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end := instant.Add(30 * time.Second)
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now = nowSeries(instant, end)
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respBody := respBody("Howdy there!")
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hndlr := InstrumentHandler("test-handler", respBody)
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opts := SummaryOpts{
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Subsystem: "http",
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ConstLabels: Labels{"handler": "test-handler"},
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}
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reqCnt := MustRegisterOrGet(NewCounterVec(
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CounterOpts{
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Namespace: opts.Namespace,
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Subsystem: opts.Subsystem,
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Name: "requests_total",
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Help: "Total number of HTTP requests made.",
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ConstLabels: opts.ConstLabels,
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},
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instLabels,
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)).(*CounterVec)
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opts.Name = "request_duration_microseconds"
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opts.Help = "The HTTP request latencies in microseconds."
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reqDur := MustRegisterOrGet(NewSummary(opts)).(Summary)
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opts.Name = "request_size_bytes"
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opts.Help = "The HTTP request sizes in bytes."
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MustRegisterOrGet(NewSummary(opts))
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opts.Name = "response_size_bytes"
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opts.Help = "The HTTP response sizes in bytes."
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MustRegisterOrGet(NewSummary(opts))
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reqCnt.Reset()
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resp := httptest.NewRecorder()
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req := &http.Request{
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Method: "GET",
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}
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hndlr.ServeHTTP(resp, req)
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if resp.Code != http.StatusTeapot {
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t.Fatalf("expected status %d, got %d", http.StatusTeapot, resp.Code)
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}
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if string(resp.Body.Bytes()) != "Howdy there!" {
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t.Fatalf("expected body %s, got %s", "Howdy there!", string(resp.Body.Bytes()))
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}
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out := &dto.Metric{}
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reqDur.Write(out)
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if want, got := "test-handler", out.Label[0].GetValue(); want != got {
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t.Errorf("want label value %q in reqDur, got %q", want, got)
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}
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if want, got := uint64(1), out.Summary.GetSampleCount(); want != got {
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t.Errorf("want sample count %d in reqDur, got %d", want, got)
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}
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out.Reset()
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if want, got := 1, len(reqCnt.children); want != got {
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t.Errorf("want %d children in reqCnt, got %d", want, got)
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}
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cnt, err := reqCnt.GetMetricWithLabelValues("get", "418")
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if err != nil {
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t.Fatal(err)
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}
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cnt.Write(out)
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if want, got := "418", out.Label[0].GetValue(); want != got {
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t.Errorf("want label value %q in reqCnt, got %q", want, got)
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}
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if want, got := "test-handler", out.Label[1].GetValue(); want != got {
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t.Errorf("want label value %q in reqCnt, got %q", want, got)
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}
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if want, got := "get", out.Label[2].GetValue(); want != got {
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t.Errorf("want label value %q in reqCnt, got %q", want, got)
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}
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if out.Counter == nil {
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t.Fatal("expected non-nil counter in reqCnt")
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}
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if want, got := 1., out.Counter.GetValue(); want != got {
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t.Errorf("want reqCnt of %f, got %f", want, got)
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}
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}
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