traefik/pkg/middlewares/capture/capture_test.go

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package capture
import (
"bytes"
"fmt"
"io"
"net/http"
"net/http/httptest"
"testing"
"github.com/containous/alice"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestCapture(t *testing.T) {
wrapMiddleware := func(next http.Handler) (http.Handler, error) {
return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
capt, err := FromContext(req.Context())
require.NoError(t, err)
_, err = fmt.Fprintf(rw, "%d,%d,%d,", capt.RequestSize(), capt.ResponseSize(), capt.StatusCode())
require.NoError(t, err)
next.ServeHTTP(rw, req)
_, err = fmt.Fprintf(rw, ",%d,%d,%d", capt.RequestSize(), capt.ResponseSize(), capt.StatusCode())
require.NoError(t, err)
}), nil
}
handler := http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
_, err := rw.Write([]byte("foo"))
require.NoError(t, err)
all, err := io.ReadAll(req.Body)
require.NoError(t, err)
assert.Equal(t, "bar", string(all))
})
chain := alice.New()
chain = chain.Append(Wrap)
chain = chain.Append(wrapMiddleware)
handlers, err := chain.Then(handler)
require.NoError(t, err)
request, err := http.NewRequest(http.MethodGet, "/", bytes.NewReader([]byte("bar")))
require.NoError(t, err)
recorder := httptest.NewRecorder()
handlers.ServeHTTP(recorder, request)
// 3 = len("bar")
// 9 = len("0,0,0,toto")
assert.Equal(t, "0,0,0,foo,3,9,200", recorder.Body.String())
}
// BenchmarkCapture with response writer and request reader
// $ go test -bench=. ./pkg/middlewares/capture/
// goos: linux
// goarch: amd64
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// pkg: github.com/traefik/traefik/v3/pkg/middlewares/capture
// cpu: Intel(R) Core(TM) i7-10750H CPU @ 2.60GHz
// BenchmarkCapture/2k-12 280507 4015 ns/op 510.03 MB/s 5072 B/op 14 allocs/op
// BenchmarkCapture/20k-12 135726 8301 ns/op 2467.26 MB/s 41936 B/op 14 allocs/op
// BenchmarkCapture/100k-12 45494 26059 ns/op 3929.54 MB/s 213968 B/op 14 allocs/op
// BenchmarkCapture/2k_captured-12 263713 4356 ns/op 470.20 MB/s 5552 B/op 18 allocs/op
// BenchmarkCapture/20k_captured-12 132243 8790 ns/op 2329.98 MB/s 42416 B/op 18 allocs/op
// BenchmarkCapture/100k_captured-12 45650 26587 ns/op 3851.57 MB/s 214448 B/op 18 allocs/op
// BenchmarkCapture/2k_body-12 274135 7471 ns/op 274.12 MB/s 5624 B/op 20 allocs/op
// BenchmarkCapture/20k_body-12 130206 21149 ns/op 968.36 MB/s 42488 B/op 20 allocs/op
// BenchmarkCapture/100k_body-12 41600 51716 ns/op 1980.06 MB/s 214520 B/op 20 allocs/op
// PASS
func BenchmarkCapture(b *testing.B) {
testCases := []struct {
name string
size int
capture bool
body bool
}{
{
name: "2k",
size: 2048,
},
{
name: "20k",
size: 20480,
},
{
name: "100k",
size: 102400,
},
{
name: "2k captured",
size: 2048,
capture: true,
},
{
name: "20k captured",
size: 20480,
capture: true,
},
{
name: "100k captured",
size: 102400,
capture: true,
},
{
name: "2k body",
size: 2048,
body: true,
},
{
name: "20k body",
size: 20480,
body: true,
},
{
name: "100k body",
size: 102400,
body: true,
},
}
for _, test := range testCases {
b.Run(test.name, func(b *testing.B) {
baseBody := generateBytes(test.size)
next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
n, err := rw.Write(baseBody)
require.Equal(b, test.size, n)
require.NoError(b, err)
})
var body io.Reader
if test.body {
body = bytes.NewReader(baseBody)
}
req, err := http.NewRequest(http.MethodGet, "http://foo/", body)
require.NoError(b, err)
chain := alice.New()
if test.capture || test.body {
chain = chain.Append(Wrap)
}
handlers, err := chain.Then(next)
require.NoError(b, err)
b.ReportAllocs()
b.SetBytes(int64(test.size))
b.ResetTimer()
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for range b.N {
runBenchmark(b, test.size, req, handlers)
}
})
}
}
func runBenchmark(b *testing.B, size int, req *http.Request, handler http.Handler) {
b.Helper()
recorder := httptest.NewRecorder()
handler.ServeHTTP(recorder, req)
if code := recorder.Code; code != 200 {
b.Fatalf("Expected 200 but got %d", code)
}
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assert.Len(b, recorder.Body.String(), size)
}
func generateBytes(length int) []byte {
var value []byte
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for i := range length {
value = append(value, 0x61+byte(i%26))
}
return value
}
func TestRequestReader(t *testing.T) {
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buff := bytes.NewBufferString("foo")
rr := readCounter{source: io.NopCloser(buff)}
assert.Equal(t, int64(0), rr.size)
n, err := rr.Read([]byte("bar"))
require.NoError(t, err)
assert.Equal(t, 3, n)
err = rr.Close()
require.NoError(t, err)
assert.Equal(t, int64(3), rr.size)
}