mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2025-01-26 03:52:03 +02:00
135 lines
3.7 KiB
Go
135 lines
3.7 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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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 othttp
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import (
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"net/http/httptest"
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"testing"
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"github.com/stretchr/testify/assert"
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"google.golang.org/grpc/codes"
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"go.opentelemetry.io/otel/api/kv"
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"go.opentelemetry.io/otel/api/standard"
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"go.opentelemetry.io/otel/api/trace"
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mockmeter "go.opentelemetry.io/otel/internal/metric"
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mocktrace "go.opentelemetry.io/otel/internal/trace"
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)
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func assertMetricLabels(t *testing.T, expectedLabels []kv.KeyValue, measurementBatches []mockmeter.Batch) {
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for _, batch := range measurementBatches {
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assert.ElementsMatch(t, expectedLabels, batch.Labels)
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}
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}
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func TestHandlerBasics(t *testing.T) {
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rr := httptest.NewRecorder()
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var id uint64
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tracer := mocktrace.MockTracer{StartSpanID: &id}
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meterimpl, meter := mockmeter.NewMeter()
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operation := "test_handler"
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h := NewHandler(
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http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if _, err := io.WriteString(w, "hello world"); err != nil {
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t.Fatal(err)
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}
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}), operation,
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WithTracer(&tracer),
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WithMeter(meter),
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)
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r, err := http.NewRequest(http.MethodGet, "http://localhost/", nil)
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if err != nil {
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t.Fatal(err)
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}
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h.ServeHTTP(rr, r)
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if len(meterimpl.MeasurementBatches) == 0 {
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t.Fatalf("got 0 recorded measurements, expected 1 or more")
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}
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labelsToVerify := []kv.KeyValue{
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standard.HTTPServerNameKey.String(operation),
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standard.HTTPSchemeHTTP,
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standard.HTTPHostKey.String(r.Host),
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standard.HTTPFlavorKey.String(fmt.Sprintf("1.%d", r.ProtoMinor)),
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}
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assertMetricLabels(t, labelsToVerify, meterimpl.MeasurementBatches)
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if got, expected := rr.Result().StatusCode, http.StatusOK; got != expected {
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t.Fatalf("got %d, expected %d", got, expected)
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}
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if got := rr.Header().Get("Traceparent"); got == "" {
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t.Fatal("expected non empty trace header")
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}
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if got, expected := id, uint64(1); got != expected {
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t.Fatalf("got %d, expected %d", got, expected)
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}
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d, err := ioutil.ReadAll(rr.Result().Body)
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if err != nil {
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t.Fatal(err)
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}
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if got, expected := string(d), "hello world"; got != expected {
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t.Fatalf("got %q, expected %q", got, expected)
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}
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}
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func TestHandlerNoWrite(t *testing.T) {
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rr := httptest.NewRecorder()
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var id uint64
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tracer := mocktrace.MockTracer{StartSpanID: &id}
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operation := "test_handler"
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var span trace.Span
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h := NewHandler(
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http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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span = trace.SpanFromContext(r.Context())
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}), operation,
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WithTracer(&tracer),
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)
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r, err := http.NewRequest(http.MethodGet, "http://localhost/", nil)
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if err != nil {
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t.Fatal(err)
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}
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h.ServeHTTP(rr, r)
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if got, expected := rr.Result().StatusCode, http.StatusOK; got != expected {
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t.Fatalf("got %d, expected %d", got, expected)
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}
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if got := rr.Header().Get("Traceparent"); got != "" {
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t.Fatal("expected empty trace header")
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}
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if got, expected := id, uint64(1); got != expected {
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t.Fatalf("got %d, expected %d", got, expected)
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}
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if mockSpan, ok := span.(*mocktrace.MockSpan); ok {
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if got, expected := mockSpan.Status, codes.OK; got != expected {
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t.Fatalf("got %q, expected %q", got, expected)
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}
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} else {
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t.Fatalf("Expected *moctrace.MockSpan, got %T", span)
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}
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}
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