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 // 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() 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) } assert.Len(b, recorder.Body.String(), size) } func generateBytes(length int) []byte { var value []byte for i := range length { value = append(value, 0x61+byte(i%26)) } return value } func TestRequestReader(t *testing.T) { 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) }