Add ConvertNetHttpRequestToFastHttpRequest adaptor function

fasthttpadaptor/request.go

@@ -3,8 +3,10 @@ package fasthttpadaptor
 import (
 	"bytes"
 	"io"
+	"net"
 	"net/http"
 	"net/url"
+	"strconv"
 	"strings"
 
 	"github.com/valyala/fasthttp"
@@ -68,3 +70,62 @@ func ConvertRequest(ctx *fasthttp.RequestCtx, r *http.Request, forServer bool) e
 
 	return nil
 }
+
+// ConvertNetHttpToFastHttp converts an http.Request to a fasthttp.RequestCtx.
+// The caller is responsible for the lifecycle of the fasthttp.RequestCtx.
+func ConvertNetHttpRequestToFastHttpRequest(r *http.Request, ctx *fasthttp.RequestCtx) error {
+	ctx.Request.Header.SetMethod(r.Method)
+
+	if r.RequestURI != "" {
+		ctx.Request.SetRequestURI(r.RequestURI)
+	} else if r.URL != nil {
+		ctx.Request.SetRequestURI(r.URL.RequestURI())
+	}
+
+	ctx.Request.Header.SetProtocol(r.Proto)
+	ctx.Request.SetHost(r.Host)
+
+	for k, values := range r.Header {
+		for i, v := range values {
+			if i == 0 {
+				ctx.Request.Header.Set(k, v)
+			} else {
+				ctx.Request.Header.Add(k, v)
+			}
+		}
+	}
+
+	if r.Body != nil {
+		body, err := io.ReadAll(r.Body)
+		if err != nil {
+			return err
+		}
+		ctx.Request.SetBody(body)
+	}
+
+	if r.RemoteAddr != "" {
+		addr := parseRemoteAddr(r.RemoteAddr)
+		ctx.SetRemoteAddr(addr)
+	}
+
+	return nil
+}
+
+func parseRemoteAddr(addr string) net.Addr {
+	host, port, err := net.SplitHostPort(addr)
+	if err != nil {
+		return &net.TCPAddr{IP: net.ParseIP(addr)}
+	}
+	return &net.TCPAddr{
+		IP:   net.ParseIP(host),
+		Port: parsePort(port),
+	}
+}
+
+func parsePort(port string) int {
+	p, err := strconv.Atoi(port)
+	if err != nil {
+		return 0
+	}
+	return p
+}

fasthttpadaptor/request_test.go

@@ -1,7 +1,11 @@
 package fasthttpadaptor
 
 import (
+	"bytes"
+	"errors"
+	"io"
 	"net/http"
+	"net/url"
 	"testing"
 
 	"github.com/valyala/fasthttp"
@@ -27,3 +31,251 @@ func BenchmarkConvertRequest(b *testing.B) {
 		_ = ConvertRequest(ctx, &httpReq, true)
 	}
 }
+
+func BenchmarkConvertNetHttpRequestToFastHttpRequest(b *testing.B) {
+	var httpReq http.Request = http.Request{
+		Method:     "GET",
+		RequestURI: "/test",
+		Host:       "test",
+		Header: http.Header{
+			"X": []string{"test"},
+			"Y": []string{"test"},
+		},
+	}
+
+	ctx := &fasthttp.RequestCtx{}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_ = ConvertNetHttpRequestToFastHttpRequest(&httpReq, ctx)
+	}
+}
+
+// errReader is a reader that always returns an error.
+type errReader struct{}
+
+func (errReader) Read([]byte) (int, error) {
+	return 0, errors.New("read error")
+}
+
+func TestConvertNetHttpRequestToFastHttpRequest(t *testing.T) {
+	t.Parallel()
+
+	t.Run("basic conversion", func(t *testing.T) {
+		t.Parallel()
+		httpReq := &http.Request{
+			Method:     "POST",
+			RequestURI: "/test/path?query=1",
+			Proto:      "HTTP/1.1",
+			Host:       "example.com",
+			Header:     http.Header{},
+		}
+
+		ctx := &fasthttp.RequestCtx{}
+		err := ConvertNetHttpRequestToFastHttpRequest(httpReq, ctx)
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+
+		if string(ctx.Method()) != "POST" {
+			t.Errorf("expected method POST, got %s", ctx.Method())
+		}
+		if string(ctx.RequestURI()) != "/test/path?query=1" {
+			t.Errorf("expected URI /test/path?query=1, got %s", ctx.RequestURI())
+		}
+		if string(ctx.Request.Header.Protocol()) != "HTTP/1.1" {
+			t.Errorf("expected protocol HTTP/1.1, got %s", ctx.Request.Header.Protocol())
+		}
+		if string(ctx.Host()) != "example.com" {
+			t.Errorf("expected host example.com, got %s", ctx.Host())
+		}
+	})
+
+	t.Run("URL fallback when RequestURI is empty", func(t *testing.T) {
+		t.Parallel()
+		httpReq := &http.Request{
+			Method:     "GET",
+			RequestURI: "",
+			URL: &url.URL{
+				Path:     "/fallback/path",
+				RawQuery: "foo=bar",
+			},
+			Proto:  "HTTP/1.1",
+			Host:   "fallback.com",
+			Header: http.Header{},
+		}
+
+		ctx := &fasthttp.RequestCtx{}
+		err := ConvertNetHttpRequestToFastHttpRequest(httpReq, ctx)
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+
+		if string(ctx.RequestURI()) != "/fallback/path?foo=bar" {
+			t.Errorf("expected URI /fallback/path?foo=bar, got %s", ctx.RequestURI())
+		}
+	})
+
+	t.Run("single header", func(t *testing.T) {
+		t.Parallel()
+		httpReq := &http.Request{
+			Method:     "GET",
+			RequestURI: "/",
+			Proto:      "HTTP/1.1",
+			Host:       "example.com",
+			Header: http.Header{
+				"X-Custom-Header": []string{"custom-value"},
+			},
+		}
+
+		ctx := &fasthttp.RequestCtx{}
+		err := ConvertNetHttpRequestToFastHttpRequest(httpReq, ctx)
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+
+		if string(ctx.Request.Header.Peek("X-Custom-Header")) != "custom-value" {
+			t.Errorf("expected header value custom-value, got %s", ctx.Request.Header.Peek("X-Custom-Header"))
+		}
+	})
+
+	t.Run("multiple header values", func(t *testing.T) {
+		t.Parallel()
+		httpReq := &http.Request{
+			Method:     "GET",
+			RequestURI: "/",
+			Proto:      "HTTP/1.1",
+			Host:       "example.com",
+			Header: http.Header{
+				"Accept": []string{"text/html", "application/json", "text/plain"},
+			},
+		}
+
+		ctx := &fasthttp.RequestCtx{}
+		err := ConvertNetHttpRequestToFastHttpRequest(httpReq, ctx)
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+
+		// Check all header values are present
+		var values []string
+		ctx.Request.Header.VisitAll(func(key, value []byte) {
+			if string(key) == "Accept" {
+				values = append(values, string(value))
+			}
+		})
+
+		if len(values) != 3 {
+			t.Errorf("expected 3 Accept header values, got %d", len(values))
+		}
+	})
+
+	t.Run("request body", func(t *testing.T) {
+		t.Parallel()
+		bodyContent := []byte("test body content")
+		httpReq := &http.Request{
+			Method:     "POST",
+			RequestURI: "/",
+			Proto:      "HTTP/1.1",
+			Host:       "example.com",
+			Header:     http.Header{},
+			Body:       io.NopCloser(bytes.NewReader(bodyContent)),
+		}
+
+		ctx := &fasthttp.RequestCtx{}
+		err := ConvertNetHttpRequestToFastHttpRequest(httpReq, ctx)
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+
+		if !bytes.Equal(ctx.Request.Body(), bodyContent) {
+			t.Errorf("expected body %q, got %q", bodyContent, ctx.Request.Body())
+		}
+	})
+
+	t.Run("nil body", func(t *testing.T) {
+		t.Parallel()
+		httpReq := &http.Request{
+			Method:     "GET",
+			RequestURI: "/",
+			Proto:      "HTTP/1.1",
+			Host:       "example.com",
+			Header:     http.Header{},
+			Body:       nil,
+		}
+
+		ctx := &fasthttp.RequestCtx{}
+		err := ConvertNetHttpRequestToFastHttpRequest(httpReq, ctx)
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+
+		if len(ctx.Request.Body()) != 0 {
+			t.Errorf("expected empty body, got %q", ctx.Request.Body())
+		}
+	})
+
+	t.Run("remote address with port", func(t *testing.T) {
+		t.Parallel()
+		httpReq := &http.Request{
+			Method:     "GET",
+			RequestURI: "/",
+			Proto:      "HTTP/1.1",
+			Host:       "example.com",
+			Header:     http.Header{},
+			RemoteAddr: "192.168.1.100:8080",
+		}
+
+		ctx := &fasthttp.RequestCtx{}
+		err := ConvertNetHttpRequestToFastHttpRequest(httpReq, ctx)
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+
+		remoteAddr := ctx.RemoteAddr().String()
+		if remoteAddr != "192.168.1.100:8080" {
+			t.Errorf("expected remote addr 192.168.1.100:8080, got %s", remoteAddr)
+		}
+	})
+
+	t.Run("remote address without port", func(t *testing.T) {
+		t.Parallel()
+		httpReq := &http.Request{
+			Method:     "GET",
+			RequestURI: "/",
+			Proto:      "HTTP/1.1",
+			Host:       "example.com",
+			Header:     http.Header{},
+			RemoteAddr: "192.168.1.100",
+		}
+
+		ctx := &fasthttp.RequestCtx{}
+		err := ConvertNetHttpRequestToFastHttpRequest(httpReq, ctx)
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+
+		remoteAddr := ctx.RemoteAddr().String()
+		if remoteAddr != "192.168.1.100:0" {
+			t.Errorf("expected remote addr 192.168.1.100:0, got %s", remoteAddr)
+		}
+	})
+
+	t.Run("body read error", func(t *testing.T) {
+		t.Parallel()
+		httpReq := &http.Request{
+			Method:     "POST",
+			RequestURI: "/",
+			Proto:      "HTTP/1.1",
+			Host:       "example.com",
+			Header:     http.Header{},
+			Body:       io.NopCloser(errReader{}),
+		}
+
+		ctx := &fasthttp.RequestCtx{}
+		err := ConvertNetHttpRequestToFastHttpRequest(httpReq, ctx)
+		if err == nil {
+			t.Fatal("expected error, got nil")
+		}
+	})
+}