Gin compat (#260)

examples/gin-compat/adaptor_test.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestFuegoGin(t *testing.T) {
+	e, _ := server()
+
+	t.Run("simply test gin", func(t *testing.T) {
+		r := httptest.NewRequest("GET", "/gin", nil)
+		w := httptest.NewRecorder()
+
+		e.ServeHTTP(w, r)
+
+		require.Equal(t, 200, w.Code)
+	})
+
+	t.Run("test fuego plugin", func(t *testing.T) {
+		r := httptest.NewRequest("GET", "/fuego", nil)
+		w := httptest.NewRecorder()
+
+		e.ServeHTTP(w, r)
+
+		require.Equal(t, http.StatusOK, w.Code)
+		require.JSONEq(t, `{"message":"Hello "}`, w.Body.String())
+	})
+}

examples/gin-compat/go.mod

@@ -0,0 +1,49 @@
+module github.com/go-fuego/examples/gin-compat
+
+go 1.23.3
+
+require (
+	github.com/bytedance/sonic v1.11.6 // indirect
+	github.com/bytedance/sonic/loader v0.1.1 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.7 // indirect
+	github.com/getkin/kin-openapi v0.128.0 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/gin-gonic/gin v1.10.0 // indirect
+	github.com/go-fuego/fuego v0.16.2 // indirect
+	github.com/go-openapi/jsonpointer v0.21.0 // indirect
+	github.com/go-openapi/swag v0.23.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.23.0 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/golang-jwt/jwt/v5 v5.2.1 // indirect
+	github.com/gorilla/schema v1.4.1 // indirect
+	github.com/invopop/yaml v0.3.1 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.7 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/perimeterx/marshmallow v1.1.5 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/stretchr/testify v1.10.0 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
+	golang.org/x/arch v0.8.0 // indirect
+	golang.org/x/crypto v0.31.0 // indirect
+	golang.org/x/net v0.32.0 // indirect
+	golang.org/x/sys v0.28.0 // indirect
+	golang.org/x/text v0.21.0 // indirect
+	google.golang.org/protobuf v1.34.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
+
+replace github.com/go-fuego/fuego => ../..

examples/gin-compat/go.sum

@@ -0,0 +1,105 @@
+github.com/bytedance/sonic v1.11.6 h1:oUp34TzMlL+OY1OUWxHqsdkgC/Zfc85zGqw9siXjrc0=
+github.com/bytedance/sonic v1.11.6/go.mod h1:LysEHSvpvDySVdC2f87zGWf6CIKJcAvqab1ZaiQtds4=
+github.com/bytedance/sonic/loader v0.1.1 h1:c+e5Pt1k/cy5wMveRDyk2X4B9hF4g7an8N3zCYjJFNM=
+github.com/bytedance/sonic/loader v0.1.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
+github.com/cloudwego/base64x v0.1.4 h1:jwCgWpFanWmN8xoIUHa2rtzmkd5J2plF/dnLS6Xd/0Y=
+github.com/cloudwego/base64x v0.1.4/go.mod h1:0zlkT4Wn5C6NdauXdJRhSKRlJvmclQ1hhJgA0rcu/8w=
+github.com/cloudwego/iasm v0.2.0 h1:1KNIy1I1H9hNNFEEH3DVnI4UujN+1zjpuk6gwHLTssg=
+github.com/cloudwego/iasm v0.2.0/go.mod h1:8rXZaNYT2n95jn+zTI1sDr+IgcD2GVs0nlbbQPiEFhY=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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+github.com/gabriel-vasile/mimetype v1.4.7 h1:SKFKl7kD0RiPdbht0s7hFtjl489WcQ1VyPW8ZzUMYCA=
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examples/gin-compat/handlers.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	"github.com/go-fuego/fuego"
+)
+
+func ginController(c *gin.Context) {
+	c.String(200, "pong")
+}
+
+func fuegoControllerGet(c fuego.ContextNoBody) (HelloResponse, error) {
+	return HelloResponse{
+		Message: "Hello",
+	}, nil
+}
+
+func fuegoControllerPost(c fuego.ContextWithBody[HelloRequest]) (*HelloResponse, error) {
+	body, err := c.Body()
+	if err != nil {
+		return nil, err
+	}
+
+	if body.Word == "forbidden" {
+		return nil, fuego.BadRequestError{Title: "Forbidden word"}
+	}
+
+	_ = c.Context().(*gin.Context) // Access to the Gin context
+
+	name := c.QueryParam("name")
+	_ = c.QueryParam("not-existing-param-raises-warning")
+
+	return &HelloResponse{
+		Message: fmt.Sprintf("Hello %s, %s", body.Word, name),
+	}, nil
+}
+
+func serveOpenApiJSONDescription(s *fuego.OpenAPI) func(ctx *gin.Context) {
+	return func(ctx *gin.Context) {
+		ctx.JSON(http.StatusOK, s.Description())
+	}
+}
+
+func DefaultOpenAPIHandler(specURL string) gin.HandlerFunc {
+	return func(ctx *gin.Context) {
+		ctx.Header("Content-Type", "text/html; charset=utf-8")
+		ctx.String(200, fuego.DefaultOpenAPIHTML(specURL))
+	}
+}

examples/gin-compat/main.go

@@ -0,0 +1,104 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+
+	"github.com/go-fuego/fuego"
+	"github.com/go-fuego/fuego/extra/fuegogin"
+	"github.com/go-fuego/fuego/option"
+	"github.com/go-fuego/fuego/param"
+)
+
+type HelloRequest struct {
+	Word string `json:"word" validate:"required,min=2"`
+}
+
+var _ fuego.InTransformer = &HelloRequest{}
+
+type HelloResponse struct {
+	Message string `json:"message"`
+}
+
+func main() {
+	e, _ := server()
+
+	fmt.Println("OpenAPI at at http://localhost:8980/swagger ✅")
+
+	err := e.Run(":8980")
+	if err != nil {
+		panic(err)
+	}
+}
+
+func server() (*gin.Engine, *fuego.OpenAPI) {
+	ginRouter := gin.Default()
+	engine := fuego.NewEngine()
+
+	// Register Gin controller
+	ginRouter.GET("/gin", ginController)
+
+	// Incrementally add OpenAPI spec
+	// 1️⃣ Level 1: Register Gin controller to Gin router, plugs Fuego OpenAPI route declaration
+	fuegogin.GetGin(engine, ginRouter, "/gin-with-openapi", ginController)
+
+	// 2️⃣ Level 2: Register Gin controller to Gin router, manually add options (not checked inside the Gin controller)
+	fuegogin.GetGin(engine, ginRouter, "/gin-with-openapi-and-options", ginController,
+		// OpenAPI options
+		option.Summary("Gin controller with options"),
+		option.Description("Some description"),
+		option.OperationID("MyCustomOperationID"),
+		option.Tags("Gin"),
+	)
+
+	// 3️⃣ Level 3: Register Fuego controller to Gin router. Fuego take care of serialization/deserialization, error handling, content-negotiation, etc.
+	fuegogin.Get(engine, ginRouter, "/fuego", fuegoControllerGet)
+
+	// 4️⃣ Level 4: Add some options to the POST endpoint (checks at start-time + validations at request time)
+	fuegogin.Post(engine, ginRouter, "/fuego-with-options", fuegoControllerPost,
+		// OpenAPI options
+		option.Description("Some description"),
+		option.OperationID("SomeOperationID"),
+		option.AddError(409, "Name Already Exists"),
+		option.DefaultStatusCode(201),
+		option.Tags("Fuego"),
+
+		// Add some parameters.
+		option.Query("name", "Your name", param.Example("name example", "John Carmack")),
+		option.Header("X-Request-ID", "Request ID", param.Default("123456")),
+		option.Header("Content-Type", "Content Type", param.Default("application/json")),
+	)
+
+	// Supports groups & path parameters even for gin handlers
+	group := ginRouter.Group("/my-group/:id")
+	fuegogin.Get(engine, group, "/fuego", fuegoControllerGet,
+		option.Summary("Route with group and id"),
+		option.Tags("Fuego"),
+	)
+
+	// Serve the OpenAPI spec
+	ginRouter.GET("/openapi.json", serveOpenApiJSONDescription(engine.OpenAPI))
+	ginRouter.GET("/swagger", DefaultOpenAPIHandler("/openapi.json"))
+
+	return ginRouter, engine.OpenAPI
+}
+
+func (h *HelloRequest) InTransform(ctx context.Context) error {
+	// Transformation
+	h.Word = strings.ToLower(h.Word)
+
+	// Custom validation
+	if h.Word == "apple" {
+		return fuego.BadRequestError{Title: "Please don't use the word 'apple'"}
+	}
+
+	// Context-based transformation
+	if user := ctx.Value("user"); user == "secret agent" {
+		h.Word = "*****"
+	}
+
+	return nil
+}

examples/gin-compat/main_test.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"net/url"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/go-fuego/fuego/extra/fuegogin"
+)
+
+func TestFuegoControllerPost(t *testing.T) {
+	testCtx := &fuegogin.ContextTest[HelloRequest]{
+		BodyInjected: HelloRequest{Word: "World"},
+		Params:       url.Values{"name": []string{"Ewen"}},
+	}
+
+	response, err := fuegoControllerPost(testCtx)
+	require.NoError(t, err)
+	require.Equal(t, "Hello World, Ewen", response.Message)
+}