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adaptor.go
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adaptor.go
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package adaptor
import (
"io"
"net"
"net/http"
"reflect"
"sync"
"unsafe"
"github.com/gofiber/fiber/v3"
"github.com/gofiber/utils/v2"
"github.com/valyala/fasthttp"
"github.com/valyala/fasthttp/fasthttpadaptor"
)
var ctxPool = sync.Pool{
New: func() any {
return new(fasthttp.RequestCtx)
},
}
// HTTPHandlerFunc wraps net/http handler func to fiber handler
func HTTPHandlerFunc(h http.HandlerFunc) fiber.Handler {
return HTTPHandler(h)
}
// HTTPHandler wraps net/http handler to fiber handler
func HTTPHandler(h http.Handler) fiber.Handler {
return func(c fiber.Ctx) error {
handler := fasthttpadaptor.NewFastHTTPHandler(h)
handler(c.Context())
return nil
}
}
// ConvertRequest converts a fiber.Ctx to a http.Request.
// forServer should be set to true when the http.Request is going to be passed to a http.Handler.
func ConvertRequest(c fiber.Ctx, forServer bool) (*http.Request, error) {
var req http.Request
if err := fasthttpadaptor.ConvertRequest(c.Context(), &req, forServer); err != nil {
return nil, err //nolint:wrapcheck // This must not be wrapped
}
return &req, nil
}
// CopyContextToFiberContext copies the values of context.Context to a fasthttp.RequestCtx.
func CopyContextToFiberContext(context any, requestContext *fasthttp.RequestCtx) {
contextValues := reflect.ValueOf(context).Elem()
contextKeys := reflect.TypeOf(context).Elem()
if contextKeys.Kind() != reflect.Struct {
return
}
var lastKey any
for i := 0; i < contextValues.NumField(); i++ {
reflectValue := contextValues.Field(i)
reflectField := contextKeys.Field(i)
if reflectField.Name == "noCopy" {
break
}
// Use unsafe to access potentially unexported fields.
if reflectValue.CanAddr() {
/* #nosec */
reflectValue = reflect.NewAt(reflectValue.Type(), unsafe.Pointer(reflectValue.UnsafeAddr())).Elem()
}
switch reflectField.Name {
case "Context":
CopyContextToFiberContext(reflectValue.Interface(), requestContext)
case "key":
lastKey = reflectValue.Interface()
case "val":
if lastKey != nil {
requestContext.SetUserValue(lastKey, reflectValue.Interface())
lastKey = nil // Reset lastKey after setting the value
}
default:
continue
}
}
}
// HTTPMiddleware wraps net/http middleware to fiber middleware
func HTTPMiddleware(mw func(http.Handler) http.Handler) fiber.Handler {
return func(c fiber.Ctx) error {
var next bool
nextHandler := http.HandlerFunc(func(_ http.ResponseWriter, r *http.Request) {
// Convert again in case request may modify by middleware
next = true
c.Request().Header.SetMethod(r.Method)
c.Request().SetRequestURI(r.RequestURI)
c.Request().SetHost(r.Host)
c.Request().Header.SetHost(r.Host)
for key, val := range r.Header {
for _, v := range val {
c.Request().Header.Set(key, v)
}
}
CopyContextToFiberContext(r.Context(), c.Context())
})
if err := HTTPHandler(mw(nextHandler))(c); err != nil {
return err
}
if next {
return c.Next()
}
return nil
}
}
// FiberHandler wraps fiber handler to net/http handler
func FiberHandler(h fiber.Handler) http.Handler {
return FiberHandlerFunc(h)
}
// FiberHandlerFunc wraps fiber handler to net/http handler func
func FiberHandlerFunc(h fiber.Handler) http.HandlerFunc {
return handlerFunc(fiber.New(), h)
}
// FiberApp wraps fiber app to net/http handler func
func FiberApp(app *fiber.App) http.HandlerFunc {
return handlerFunc(app)
}
func handlerFunc(app *fiber.App, h ...fiber.Handler) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
req := fasthttp.AcquireRequest()
defer fasthttp.ReleaseRequest(req)
// Convert net/http -> fasthttp request
if r.Body != nil {
n, err := io.Copy(req.BodyWriter(), r.Body)
req.Header.SetContentLength(int(n))
if err != nil {
http.Error(w, utils.StatusMessage(fiber.StatusInternalServerError), fiber.StatusInternalServerError)
return
}
}
req.Header.SetMethod(r.Method)
req.SetRequestURI(r.RequestURI)
req.SetHost(r.Host)
req.Header.SetHost(r.Host)
for key, val := range r.Header {
for _, v := range val {
req.Header.Set(key, v)
}
}
if _, _, err := net.SplitHostPort(r.RemoteAddr); err != nil && err.(*net.AddrError).Err == "missing port in address" { //nolint:errorlint, forcetypeassert // overlinting
r.RemoteAddr = net.JoinHostPort(r.RemoteAddr, "80")
}
remoteAddr, err := net.ResolveTCPAddr("tcp", r.RemoteAddr)
if err != nil {
http.Error(w, utils.StatusMessage(fiber.StatusInternalServerError), fiber.StatusInternalServerError)
return
}
// New fasthttp Ctx from pool
fctx := ctxPool.Get().(*fasthttp.RequestCtx) //nolint:forcetypeassert,errcheck // overlinting
fctx.Response.Reset()
fctx.Request.Reset()
defer ctxPool.Put(fctx)
fctx.Init(req, remoteAddr, nil)
if len(h) > 0 {
// New fiber Ctx
ctx := app.AcquireCtx(fctx)
defer app.ReleaseCtx(ctx)
// Execute fiber Ctx
err := h[0](ctx)
if err != nil {
_ = app.Config().ErrorHandler(ctx, err) //nolint:errcheck // not needed
}
} else {
// Execute fasthttp Ctx though app.Handler
app.Handler()(fctx)
}
// Convert fasthttp Ctx -> net/http
fctx.Response.Header.VisitAll(func(k, v []byte) {
w.Header().Add(string(k), string(v))
})
w.WriteHeader(fctx.Response.StatusCode())
_, _ = w.Write(fctx.Response.Body()) //nolint:errcheck // not needed
}
}