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107 lines
2.7 KiB
107 lines
2.7 KiB
5 years ago
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package denco
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import (
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"net/http"
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)
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// Mux represents a multiplexer for HTTP request.
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type Mux struct{}
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// NewMux returns a new Mux.
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func NewMux() *Mux {
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return &Mux{}
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}
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// GET is shorthand of Mux.Handler("GET", path, handler).
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func (m *Mux) GET(path string, handler HandlerFunc) Handler {
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return m.Handler("GET", path, handler)
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}
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// POST is shorthand of Mux.Handler("POST", path, handler).
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func (m *Mux) POST(path string, handler HandlerFunc) Handler {
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return m.Handler("POST", path, handler)
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}
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// PUT is shorthand of Mux.Handler("PUT", path, handler).
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func (m *Mux) PUT(path string, handler HandlerFunc) Handler {
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return m.Handler("PUT", path, handler)
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}
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// HEAD is shorthand of Mux.Handler("HEAD", path, handler).
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func (m *Mux) HEAD(path string, handler HandlerFunc) Handler {
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return m.Handler("HEAD", path, handler)
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}
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// Handler returns a handler for HTTP method.
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func (m *Mux) Handler(method, path string, handler HandlerFunc) Handler {
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return Handler{
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Method: method,
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Path: path,
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Func: handler,
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}
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}
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// Build builds a http.Handler.
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func (m *Mux) Build(handlers []Handler) (http.Handler, error) {
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recordMap := make(map[string][]Record)
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for _, h := range handlers {
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recordMap[h.Method] = append(recordMap[h.Method], NewRecord(h.Path, h.Func))
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}
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mux := newServeMux()
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for m, records := range recordMap {
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router := New()
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if err := router.Build(records); err != nil {
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return nil, err
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}
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mux.routers[m] = router
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}
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return mux, nil
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}
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// Handler represents a handler of HTTP request.
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type Handler struct {
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// Method is an HTTP method.
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Method string
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// Path is a routing path for handler.
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Path string
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// Func is a function of handler of HTTP request.
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Func HandlerFunc
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}
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// The HandlerFunc type is aliased to type of handler function.
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type HandlerFunc func(w http.ResponseWriter, r *http.Request, params Params)
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type serveMux struct {
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routers map[string]*Router
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}
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func newServeMux() *serveMux {
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return &serveMux{
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routers: make(map[string]*Router),
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}
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}
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// ServeHTTP implements http.Handler interface.
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func (mux *serveMux) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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handler, params := mux.handler(r.Method, r.URL.Path)
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handler(w, r, params)
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}
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func (mux *serveMux) handler(method, path string) (HandlerFunc, []Param) {
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if router, found := mux.routers[method]; found {
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if handler, params, found := router.Lookup(path); found {
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return handler.(HandlerFunc), params
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}
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}
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return NotFound, nil
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}
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// NotFound replies to the request with an HTTP 404 not found error.
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// NotFound is called when unknown HTTP method or a handler not found.
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// If you want to use the your own NotFound handler, please overwrite this variable.
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var NotFound = func(w http.ResponseWriter, r *http.Request, _ Params) {
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http.NotFound(w, r)
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}
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