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transport_test.go
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transport_test.go
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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package otelhttp
import (
"bytes"
"context"
"errors"
"io"
"io/ioutil"
"net/http"
"net/http/httptest"
"testing"
"github.com/stretchr/testify/assert"
"go.opentelemetry.io/otel/codes"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/trace"
)
func TestTransportFormatter(t *testing.T) {
var httpMethods = []struct {
name string
method string
expected string
}{
{
"GET method",
http.MethodGet,
"HTTP GET",
},
{
"HEAD method",
http.MethodHead,
"HTTP HEAD",
},
{
"POST method",
http.MethodPost,
"HTTP POST",
},
{
"PUT method",
http.MethodPut,
"HTTP PUT",
},
{
"PATCH method",
http.MethodPatch,
"HTTP PATCH",
},
{
"DELETE method",
http.MethodDelete,
"HTTP DELETE",
},
{
"CONNECT method",
http.MethodConnect,
"HTTP CONNECT",
},
{
"OPTIONS method",
http.MethodOptions,
"HTTP OPTIONS",
},
{
"TRACE method",
http.MethodTrace,
"HTTP TRACE",
},
}
for _, tc := range httpMethods {
t.Run(tc.name, func(t *testing.T) {
r, err := http.NewRequest(tc.method, "http://localhost/", nil)
if err != nil {
t.Fatal(err)
}
formattedName := "HTTP " + r.Method
if formattedName != tc.expected {
t.Fatalf("unexpected name: got %s, expected %s", formattedName, tc.expected)
}
})
}
}
func TestTransportBasics(t *testing.T) {
prop := propagation.TraceContext{}
content := []byte("Hello, world!")
ctx := context.Background()
sc := trace.NewSpanContext(trace.SpanContextConfig{
TraceID: trace.TraceID{0x01},
SpanID: trace.SpanID{0x01},
})
ctx = trace.ContextWithRemoteSpanContext(ctx, sc)
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := prop.Extract(r.Context(), propagation.HeaderCarrier(r.Header))
span := trace.SpanContextFromContext(ctx)
if span.SpanID() != sc.SpanID() {
t.Fatalf("testing remote SpanID: got %s, expected %s", span.SpanID(), sc.SpanID())
}
if _, err := w.Write(content); err != nil {
t.Fatal(err)
}
}))
defer ts.Close()
r, err := http.NewRequestWithContext(ctx, http.MethodGet, ts.URL, nil)
if err != nil {
t.Fatal(err)
}
tr := NewTransport(http.DefaultTransport, WithPropagators(prop))
c := http.Client{Transport: tr}
res, err := c.Do(r)
if err != nil {
t.Fatal(err)
}
body, err := ioutil.ReadAll(res.Body)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(body, content) {
t.Fatalf("unexpected content: got %s, expected %s", body, content)
}
}
func TestNilTransport(t *testing.T) {
prop := propagation.TraceContext{}
content := []byte("Hello, world!")
ctx := context.Background()
sc := trace.NewSpanContext(trace.SpanContextConfig{
TraceID: trace.TraceID{0x01},
SpanID: trace.SpanID{0x01},
})
ctx = trace.ContextWithRemoteSpanContext(ctx, sc)
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := prop.Extract(r.Context(), propagation.HeaderCarrier(r.Header))
span := trace.SpanContextFromContext(ctx)
if span.SpanID() != sc.SpanID() {
t.Fatalf("testing remote SpanID: got %s, expected %s", span.SpanID(), sc.SpanID())
}
if _, err := w.Write(content); err != nil {
t.Fatal(err)
}
}))
defer ts.Close()
r, err := http.NewRequestWithContext(ctx, http.MethodGet, ts.URL, nil)
if err != nil {
t.Fatal(err)
}
tr := NewTransport(nil, WithPropagators(prop))
c := http.Client{Transport: tr}
res, err := c.Do(r)
if err != nil {
t.Fatal(err)
}
body, err := ioutil.ReadAll(res.Body)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(body, content) {
t.Fatalf("unexpected content: got %s, expected %s", body, content)
}
}
const readSize = 42
type readCloser struct {
readErr, closeErr error
}
func (rc readCloser) Read(p []byte) (n int, err error) {
return readSize, rc.readErr
}
func (rc readCloser) Close() error {
return rc.closeErr
}
type span struct {
trace.Span
ended bool
recordedErr error
statusCode codes.Code
statusDesc string
}
func (s *span) End(...trace.SpanEndOption) {
s.ended = true
}
func (s *span) RecordError(err error, _ ...trace.EventOption) {
s.recordedErr = err
}
func (s *span) SetStatus(c codes.Code, d string) {
s.statusCode, s.statusDesc = c, d
}
func (s *span) assert(t *testing.T, ended bool, err error, c codes.Code, d string) {
if ended {
assert.True(t, s.ended, "not ended")
} else {
assert.False(t, s.ended, "ended")
}
if err == nil {
assert.NoError(t, s.recordedErr, "recorded an error")
} else {
assert.Equal(t, err, s.recordedErr)
}
assert.Equal(t, c, s.statusCode, "status codes not equal")
assert.Equal(t, d, s.statusDesc, "status description not equal")
}
func TestWrappedBodyRead(t *testing.T) {
s := new(span)
wb := &wrappedBody{span: trace.Span(s), body: readCloser{}}
n, err := wb.Read([]byte{})
assert.Equal(t, readSize, n, "wrappedBody returned wrong bytes")
assert.NoError(t, err)
s.assert(t, false, nil, codes.Unset, "")
}
func TestWrappedBodyReadEOFError(t *testing.T) {
s := new(span)
wb := &wrappedBody{span: trace.Span(s), body: readCloser{readErr: io.EOF}}
n, err := wb.Read([]byte{})
assert.Equal(t, readSize, n, "wrappedBody returned wrong bytes")
assert.Equal(t, io.EOF, err)
s.assert(t, true, nil, codes.Unset, "")
}
func TestWrappedBodyReadError(t *testing.T) {
s := new(span)
expectedErr := errors.New("test")
wb := &wrappedBody{span: trace.Span(s), body: readCloser{readErr: expectedErr}}
n, err := wb.Read([]byte{})
assert.Equal(t, readSize, n, "wrappedBody returned wrong bytes")
assert.Equal(t, expectedErr, err)
s.assert(t, false, expectedErr, codes.Error, expectedErr.Error())
}
func TestWrappedBodyClose(t *testing.T) {
s := new(span)
wb := &wrappedBody{span: trace.Span(s), body: readCloser{}}
assert.NoError(t, wb.Close())
s.assert(t, true, nil, codes.Unset, "")
}
func TestWrappedBodyCloseError(t *testing.T) {
s := new(span)
expectedErr := errors.New("test")
wb := &wrappedBody{span: trace.Span(s), body: readCloser{closeErr: expectedErr}}
assert.Equal(t, expectedErr, wb.Close())
s.assert(t, true, nil, codes.Unset, "")
}