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middleware.go
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middleware.go
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// Copyright 2020 CleverGo. All rights reserved.
// Use of this source code is governed by a MIT style license that can be found
// in the LICENSE file.
package clevergo
import (
"net/http"
"runtime/debug"
"sync"
)
// MiddlewareFunc is a function that receives a handle and returns a handle.
type MiddlewareFunc func(Handle) Handle
// WrapH wraps a HTTP handler and returns a middleware.
func WrapH(h http.Handler) MiddlewareFunc {
return func(handle Handle) Handle {
return func(c *Context) error {
h.ServeHTTP(c.Response, c.Request)
return handle(c)
}
}
}
// WrapHH wraps func(http.Handler) http.Handler and returns a middleware.
func WrapHH(fn func(http.Handler) http.Handler) MiddlewareFunc {
nextHandler := new(middlewareHandler)
handler := fn(nextHandler)
return func(handle Handle) Handle {
return func(c *Context) error {
state := getMiddlewareState()
defer func() {
putMiddlewareState(state)
}()
state.ctx = c
state.next = handle
c.WithValue(nextHandler, state)
handler.ServeHTTP(c.Response, c.Request)
return state.err
}
}
}
type middlewareHandler struct {
}
func (h *middlewareHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
state := r.Context().Value(h).(*middlewareState)
defer func(w http.ResponseWriter, r *http.Request) {
state.ctx.Response = w
state.ctx.Request = r
}(state.ctx.Response, state.ctx.Request)
state.ctx.Response = w
state.ctx.Request = r
state.err = state.next(state.ctx)
}
var middlewareStatePool = sync.Pool{
New: func() interface{} {
return new(middlewareState)
},
}
func getMiddlewareState() *middlewareState {
state := middlewareStatePool.Get().(*middlewareState)
state.reset()
return state
}
func putMiddlewareState(state *middlewareState) {
middlewareStatePool.Put(state)
}
type middlewareState struct {
ctx *Context
next Handle
err error
}
func (s *middlewareState) reset() {
s.ctx = nil
s.next = nil
s.err = nil
}
// Chain wraps handle with middlewares, middlewares will be invoked in sequence.
func Chain(handle Handle, middlewares ...MiddlewareFunc) Handle {
for i := len(middlewares) - 1; i >= 0; i-- {
handle = middlewares[i](handle)
}
return handle
}
type recovery struct {
}
func (r *recovery) middleware(next Handle) Handle {
return func(c *Context) (err error) {
defer func() {
if data := recover(); data != nil {
err = PanicError{
Context: c,
Data: data,
Stack: debug.Stack(),
}
}
}()
err = next(c)
return
}
}
// Recovery returns a recovery middleware with debug enabled by default.
func Recovery() MiddlewareFunc {
r := &recovery{}
return r.middleware
}
// ServerHeader is a middleware that sets Server header.
func ServerHeader(value string) MiddlewareFunc {
return func(next Handle) Handle {
return func(c *Context) error {
c.SetHeader("Server", value)
return next(c)
}
}
}