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97 lines
2.7 KiB
97 lines
2.7 KiB
/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/*Package router is an HTTP router.
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This router provides appropriate dependency injection/encapsulation for the
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HTTP routing layer. This removes the requirement to set global variables for
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resources like database handles.
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This library does not replace the default HTTP mux because there is no need.
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Instead, it implements an HTTP handler.
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It then defines a handler function that is given a context as well as a
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request and response.
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*/
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package router
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import (
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"log"
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"net/http"
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"reflect"
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"github.com/Masterminds/httputil"
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helmhttp "github.com/kubernetes/helm/pkg/httputil"
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)
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// HandlerFunc responds to an individual HTTP request.
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//
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// Returned errors will be captured, logged, and returned as HTTP 500 errors.
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type HandlerFunc func(w http.ResponseWriter, r *http.Request, c *Context) error
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// Handler implements an http.Handler.
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//
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// This is the top level route handler.
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type Handler struct {
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c *Context
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resolver *httputil.Resolver
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routes map[string]HandlerFunc
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paths []string
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}
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// NewHandler creates a new Handler.
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//
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// Routes cannot be modified after construction. The order that the route
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// names are returned by Routes.Paths() determines the lookup order.
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func NewHandler(c *Context) *Handler {
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return &Handler{
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c: c,
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resolver: httputil.NewResolver([]string{}),
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routes: map[string]HandlerFunc{},
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paths: []string{},
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}
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}
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// Add a route to a handler.
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//
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// The route name is "VERB /ENPOINT/PATH", e.g. "GET /foo".
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func (h *Handler) Add(route string, fn HandlerFunc) {
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log.Printf("Map %q to %s", route, reflect.ValueOf(fn).Type().Name())
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h.routes[route] = fn
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h.paths = append(h.paths, route)
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h.resolver = httputil.NewResolver(h.paths)
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}
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// ServeHTTP serves an HTTP request.
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func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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log.Printf(helmhttp.LogAccess, r.Method, r.URL)
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route, err := h.resolver.Resolve(r)
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if err != nil {
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helmhttp.NotFound(w, r)
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return
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}
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fn, ok := h.routes[route]
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if !ok {
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// This is a 500 because the route was registered, but not here.
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helmhttp.Fatal(w, r, "route %s missing", route)
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}
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if err := fn(w, r, h.c); err != nil {
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helmhttp.Fatal(w, r, err.Error())
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}
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}
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