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|
package http
import (
"encoding/json"
"net/http"
)
type router struct {
routes []*route
}
type route struct {
method string
path string
handler appHandler
}
type appHandler func(http.ResponseWriter, *http.Request) (interface{}, *httpError)
func (fn appHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
data, e := fn(w, r)
w.Header().Set("Content-Type", "application/json")
if e != nil { // e is *Error, not os.Error.
if e.Message == "" {
e.Message = e.err.Error()
}
out, err := json.Marshal(e)
if err != nil {
panic(err)
}
w.WriteHeader(e.Status)
w.Write(out)
} else if data != nil {
out, err := json.Marshal(data)
if err != nil {
panic(err)
}
w.Write(out)
}
}
func newRouter() *router { return &router{} }
func notFoundHandler(w http.ResponseWriter, r *http.Request) (interface{}, *httpError) {
return nil, &httpError{
Status: http.StatusNotFound,
Message: "Resource not found",
}
}
func (r *router) route(method, path string, handler appHandler) *route {
route := route{
method: method,
path: path,
handler: handler,
}
r.routes = append(r.routes, &route)
return &route
}
func (r *router) handler() http.Handler {
return appHandler(func(w http.ResponseWriter, req *http.Request) (interface{}, *httpError) {
for _, route := range r.routes {
if route.match(req) {
return route.handler(w, req)
}
}
return notFoundHandler(w, req)
})
}
func (r *route) match(req *http.Request) bool {
if req.Method != r.method {
return false
}
if r.path != req.URL.Path {
return false
}
return true
}
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