feat(context): support chaining

Author: wanghaolong613

context.go

@@ -280,14 +280,15 @@ func (c *Context) Error(err error) *Error {
 
 // Set is used to store a new key/value pair exclusively for this context.
 // It also lazy initializes c.Keys if it was not used previously.
-func (c *Context) Set(key any, value any) {
+func (c *Context) Set(key any, value any) *Context {
 	c.mu.Lock()
 	defer c.mu.Unlock()
 	if c.Keys == nil {
 		c.Keys = make(map[any]any)
 	}
 
 	c.Keys[key] = value
+	return c
 }
 
 // Get returns the value for the given key, ie: (value, true).
@@ -506,8 +507,9 @@ func (c *Context) Param(key string) string {
 // Example Route: "/user/:id"
 // AddParam("id", 1)
 // Result: "/user/1"
-func (c *Context) AddParam(key, value string) {
+func (c *Context) AddParam(key, value string) *Context {
 	c.Params = append(c.Params, Param{Key: key, Value: value})
+	return c
 }
 
 // Query returns the keyed url query value if it exists,
@@ -1052,19 +1054,21 @@ func bodyAllowedForStatus(status int) bool {
 }
 
 // Status sets the HTTP response code.
-func (c *Context) Status(code int) {
+func (c *Context) Status(code int) *Context {
 	c.Writer.WriteHeader(code)
+	return c
 }
 
 // Header is an intelligent shortcut for c.Writer.Header().Set(key, value).
 // It writes a header in the response.
 // If value == "", this method removes the header `c.Writer.Header().Del(key)`
-func (c *Context) Header(key, value string) {
+func (c *Context) Header(key, value string) *Context {
 	if value == "" {
 		c.Writer.Header().Del(key)
-		return
+		return c
 	}
 	c.Writer.Header().Set(key, value)
+	return c
 }
 
 // GetHeader returns value from request headers.
@@ -1081,14 +1085,15 @@ func (c *Context) GetRawData() ([]byte, error) {
 }
 
 // SetSameSite with cookie
-func (c *Context) SetSameSite(samesite http.SameSite) {
+func (c *Context) SetSameSite(samesite http.SameSite) *Context {
 	c.sameSite = samesite
+	return c
 }
 
 // SetCookie adds a Set-Cookie header to the ResponseWriter's headers.
 // The provided cookie must have a valid Name. Invalid cookies may be
 // silently dropped.
-func (c *Context) SetCookie(name, value string, maxAge int, path, domain string, secure, httpOnly bool) {
+func (c *Context) SetCookie(name, value string, maxAge int, path, domain string, secure, httpOnly bool) *Context {
 	if path == "" {
 		path = "/"
 	}
@@ -1102,19 +1107,21 @@ func (c *Context) SetCookie(name, value string, maxAge int, path, domain string,
 		Secure:   secure,
 		HttpOnly: httpOnly,
 	})
+	return c
 }
 
 // SetCookieData adds a Set-Cookie header to the ResponseWriter's headers.
 // It accepts a pointer to http.Cookie structure for more flexibility in setting cookie attributes.
 // The provided cookie must have a valid Name. Invalid cookies may be silently dropped.
-func (c *Context) SetCookieData(cookie *http.Cookie) {
+func (c *Context) SetCookieData(cookie *http.Cookie) *Context {
 	if cookie.Path == "" {
 		cookie.Path = "/"
 	}
 	if cookie.SameSite == http.SameSiteDefaultMode {
 		cookie.SameSite = c.sameSite
 	}
 	http.SetCookie(c.Writer, cookie)
+	return c
 }
 
 // Cookie returns the named cookie provided in the request or
@@ -1394,8 +1401,9 @@ func (c *Context) NegotiateFormat(offered ...string) string {
 }
 
 // SetAccepted sets Accept header data.
-func (c *Context) SetAccepted(formats ...string) {
+func (c *Context) SetAccepted(formats ...string) *Context {
 	c.Accepted = formats
+	return c
 }
 
 /************************************/

context_test.go

@@ -3677,3 +3677,46 @@ func BenchmarkGetMapFromFormData(b *testing.B) {
 		})
 	}
 }
+
+func TestContextChaining(t *testing.T) {
+	c, _ := CreateTestContext(httptest.NewRecorder())
+	// Basic cookie settings
+	cookie := &http.Cookie{
+		Name:     "name",
+		Value:    "gin",
+		MaxAge:   1,
+		Path:     "/",
+		Domain:   "localhost",
+		Secure:   true,
+		HttpOnly: true,
+	}
+
+	c.Set("foo", "bar").
+		AddParam("id", "1").
+		SetSameSite(http.SameSiteLaxMode).
+		SetCookie("user", "gin", 1, "/", "localhost", true, true).
+		SetCookieData(cookie).
+		Header("Content-Type", "text/plain").
+		Header("X-Custom", "value").
+		SetAccepted(MIMEJSON, MIMEXML).
+		Status(200)
+
+	value, err := c.Get("foo")
+	assert.Equal(t, "bar", value)
+	assert.True(t, err)
+
+	v, ok := c.Params.Get("id")
+	assert.True(t, ok)
+	assert.Equal(t, "1", v)
+
+	assert.Equal(t, []string{"user=gin; Path=/; Domain=localhost; Max-Age=1; HttpOnly; Secure; SameSite=Lax", "name=gin; Path=/; Domain=localhost; Max-Age=1; HttpOnly; Secure"}, c.Writer.Header().Values("Set-Cookie"))
+
+	assert.Equal(t, "text/plain", c.Writer.Header().Get("Content-Type"))
+	assert.Equal(t, "value", c.Writer.Header().Get("X-Custom"))
+
+	assert.Equal(t, MIMEJSON, c.NegotiateFormat(MIMEJSON, MIMEXML)) //nolint:testifylint
+	assert.Equal(t, MIMEXML, c.NegotiateFormat(MIMEXML, MIMEHTML))
+	assert.Equal(t, MIMEJSON, c.NegotiateFormat(MIMEJSON)) //nolint:testifylint
+
+	assert.Equal(t, 200, c.Writer.Status())
+}