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Add middleware

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This commit is contained in:
Nise Void 2018-10-09 18:07:43 +02:00
parent 5a44e82541
commit 69754a9946
Signed by untrusted user: NiseVoid
GPG Key ID: FBA14AC83EA602F3
3 changed files with 127 additions and 65 deletions
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18
default.go Normal file
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@ -0,0 +1,18 @@
package router
import (
"fmt"
)
func defaultNotFoundHandler(c *Context) error {
return c.String(404, `not found`)
}
func defaultMethodNotAllowedHandler(c *Context) error {
return c.String(504, `method not allowed`)
}
func defaultErrorHandler(c *Context, err interface{}) {
fmt.Println(err)
c.String(500, `internal server error`)
}

41
group.go
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@ -6,48 +6,49 @@ func join(prefix, path string) string {
return urlpath.Join(prefix, urlpath.Clean(path))
}
// Group is a router group with a shared prefix and set of middlewares
type Group struct {
router *Router
prefix string
router *Router
prefix string
middleware []Middleware
}
func (g *Group) Group(prefix string) *Group {
return &Group{prefix: join(g.prefix, prefix), router: g.router}
// Group creates a new router group with a shared prefix and set of middlewares
func (g *Group) Group(prefix string, middleware ...Middleware) *Group {
return &Group{prefix: join(g.prefix, prefix), router: g.router, middleware: append(g.middleware, middleware...)}
}
// GET adds a GET route
func (g *Group) GET(path string, handle GetHandle) {
g.router.GET(join(g.prefix, path), handle)
func (g *Group) GET(path string, handle Handle, middleware ...Middleware) {
g.router.GET(join(g.prefix, path), handle, append(g.middleware, middleware...)...)
}
// POST adds a POST route
func (g *Group) POST(path string, handle interface{}) {
g.router.POST(join(g.prefix, path), handle)
func (g *Group) POST(path string, handle interface{}, middleware ...Middleware) {
g.router.POST(join(g.prefix, path), handle, append(g.middleware, middleware...)...)
}
// DELETE adds a DELETE route
func (g *Group) DELETE(path string, handle GetHandle) {
g.router.DELETE(join(g.prefix, path), handle)
func (g *Group) DELETE(path string, handle Handle, middleware ...Middleware) {
g.router.DELETE(join(g.prefix, path), handle, append(g.middleware, middleware...)...)
}
// PUT adds a PUT route
func (g *Group) PUT(path string, handle interface{}) {
checkInterfaceHandle(handle)
g.router.PUT(join(g.prefix, path), handle)
func (g *Group) PUT(path string, handle interface{}, middleware ...Middleware) {
g.router.PUT(join(g.prefix, path), handle, append(g.middleware, middleware...)...)
}
// PATCH adds a PATCH route
func (g *Group) PATCH(path string, handle interface{}) {
checkInterfaceHandle(handle)
g.router.PATCH(join(g.prefix, path), handle)
func (g *Group) PATCH(path string, handle interface{}, middleware ...Middleware) {
g.router.PATCH(join(g.prefix, path), handle, append(g.middleware, middleware...)...)
}
// HEAD adds a HEAD route
func (g *Group) HEAD(path string, handle GetHandle) {
g.router.HEAD(join(g.prefix, path), handle)
func (g *Group) HEAD(path string, handle Handle, middleware ...Middleware) {
g.router.HEAD(join(g.prefix, path), handle, append(g.middleware, middleware...)...)
}
// OPTIONS adds a OPTIONS route
func (g *Group) OPTIONS(path string, handle GetHandle) {
g.router.OPTIONS(join(g.prefix, path), handle)
func (g *Group) OPTIONS(path string, handle Handle, middleware ...Middleware) {
g.router.OPTIONS(join(g.prefix, path), handle, append(g.middleware, middleware...)...)
}

133
router.go
View File

@ -2,7 +2,6 @@ package router
import (
"encoding/json"
"fmt"
"net/http"
"reflect"
@ -10,65 +9,82 @@ import (
)
type route struct {
Method string
Path string
Handle interface{}
Method string
Path string
Handle interface{}
Middleware []Middleware
}
// GetHandle handles a request that doesn't receive a body
type GetHandle func(*Context) error
// Handle handles a request
type Handle func(*Context) error
// ErrorHandle handles a request
type ErrorHandle func(*Context, interface{})
// Middleware TODO:
type Middleware func(Handle) Handle
// Router is the router itself
type Router struct {
routes []route
Renderer Renderer
routes []route
Renderer Renderer
middleware []Middleware
NotFoundHandler Handle
MethodNotAllowedHandler Handle
ErrorHandler ErrorHandle
}
// New returns a new Router
func New() *Router {
return &Router{}
return &Router{NotFoundHandler: defaultNotFoundHandler, MethodNotAllowedHandler: defaultMethodNotAllowedHandler, ErrorHandler: defaultErrorHandler}
}
func (r *Router) Group(prefix string) *Group {
return &Group{prefix: prefix, router: r}
// Use adds a global middleware
func (r *Router) Use(m ...Middleware) {
r.middleware = append(r.middleware, m...)
}
// Group creates a new router group with a shared prefix and set of middlewares
func (r *Router) Group(prefix string, middleware ...Middleware) *Group {
return &Group{prefix: prefix, router: r, middleware: middleware}
}
// GET adds a GET route
func (r *Router) GET(path string, handle GetHandle) {
r.routes = append(r.routes, route{`GET`, path, handle})
func (r *Router) GET(path string, handle Handle, middleware ...Middleware) {
r.routes = append(r.routes, route{`GET`, path, handle, middleware})
}
// POST adds a POST route
func (r *Router) POST(path string, handle interface{}) {
func (r *Router) POST(path string, handle interface{}, middleware ...Middleware) {
checkInterfaceHandle(handle)
r.routes = append(r.routes, route{`POST`, path, handle})
r.routes = append(r.routes, route{`POST`, path, handle, middleware})
}
// DELETE adds a DELETE route
func (r *Router) DELETE(path string, handle GetHandle) {
r.routes = append(r.routes, route{`DELETE`, path, handle})
func (r *Router) DELETE(path string, handle Handle, middleware ...Middleware) {
r.routes = append(r.routes, route{`DELETE`, path, handle, middleware})
}
// PUT adds a PUT route
func (r *Router) PUT(path string, handle interface{}) {
func (r *Router) PUT(path string, handle interface{}, middleware ...Middleware) {
checkInterfaceHandle(handle)
r.routes = append(r.routes, route{`PUT`, path, handle})
r.routes = append(r.routes, route{`PUT`, path, handle, middleware})
}
// PATCH adds a PATCH route
func (r *Router) PATCH(path string, handle interface{}) {
func (r *Router) PATCH(path string, handle interface{}, middleware ...Middleware) {
checkInterfaceHandle(handle)
r.routes = append(r.routes, route{`PATCH`, path, handle})
r.routes = append(r.routes, route{`PATCH`, path, handle, middleware})
}
// HEAD adds a HEAD route
func (r *Router) HEAD(path string, handle GetHandle) {
r.routes = append(r.routes, route{`HEAD`, path, handle})
func (r *Router) HEAD(path string, handle Handle, middleware ...Middleware) {
r.routes = append(r.routes, route{`HEAD`, path, handle, middleware})
}
// OPTIONS adds a OPTIONS route
func (r *Router) OPTIONS(path string, handle GetHandle) {
r.routes = append(r.routes, route{`OPTIONS`, path, handle})
func (r *Router) OPTIONS(path string, handle Handle, middleware ...Middleware) {
r.routes = append(r.routes, route{`OPTIONS`, path, handle, middleware})
}
// Start starts the web server and binds to the given address
@ -82,19 +98,39 @@ func (r *Router) getHttpr() *httprouter.Router {
httpr := httprouter.New()
for _, v := range r.routes {
if handle, ok := v.Handle.(GetHandle); ok {
httpr.Handle(v.Method, v.Path, handleGET(r, handle))
continue
handle, ok := v.Handle.(Handle)
if !ok {
handle = handlePOST(r, v.Handle)
}
httpr.Handle(v.Method, v.Path, handlePOST(r, v.Handle))
httpr.Handle(v.Method, v.Path, handleReq(r, handle, append(r.middleware, v.Middleware...)))
}
httpr.NotFound = http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
handleReq(r, r.NotFoundHandler, r.middleware)(res, req, nil)
})
httpr.MethodNotAllowed = http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
handleReq(r, r.MethodNotAllowedHandler, r.middleware)(res, req, nil)
})
httpr.PanicHandler = func(res http.ResponseWriter, req *http.Request, err interface{}) {
c := newContext(r, res, req, nil)
r.ErrorHandler(c, err)
}
return httpr
}
func handleErr(errHandler ErrorHandle, err interface{}) Handle {
return func(c *Context) error {
errHandler(c, err)
return nil
}
}
func checkInterfaceHandle(f interface{}) {
if _, ok := f.(GetHandle); ok {
if _, ok := f.(Handle); ok {
return
}
@ -119,34 +155,41 @@ func checkInterfaceHandle(f interface{}) {
return
}
func handlePOST(r *Router, f interface{}) httprouter.Handle {
func handlePOST(r *Router, f interface{}) Handle {
funcRv, inputRt := reflect.ValueOf(f), reflect.TypeOf(f).In(1)
return func(res http.ResponseWriter, req *http.Request, param httprouter.Params) {
c := newContext(r, res, req, param)
return func(c *Context) error {
data := reflect.New(inputRt)
{
err := json.NewDecoder(req.Body).Decode(data.Interface())
req.Body.Close()
if err != nil {
c.NoContent(400) // TODO: send info about error (BindError)
return
}
err := json.NewDecoder(c.Request.Body).Decode(data.Interface())
c.Request.Body.Close()
if err != nil {
c.NoContent(400) // TODO: send info about error (BindError)
return nil
}
out := funcRv.Call([]reflect.Value{reflect.ValueOf(c), data.Elem()})
err := out[0].Interface()
_ = err
if out[0].IsNil() {
return nil
}
return out[0].Interface().(error)
}
}
func handleGET(r *Router, f GetHandle) httprouter.Handle {
func handleReq(r *Router, handle Handle, m []Middleware) httprouter.Handle {
return func(res http.ResponseWriter, req *http.Request, param httprouter.Params) {
c := newContext(r, res, req, param)
f := handle
for i := len(m) - 1; i >= 0; i-- { // TODO: 1,2,3 of 3,2,1
f = m[i](f)
}
err := f(c)
fmt.Println(err)
if err != nil {
r.ErrorHandler(c, err)
}
}
}