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package main
import (
"io/ioutil"
"log"
"net/http"
"strings"
)
func cacheIndexHandler() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
switch r.Method {
case http.MethodGet:
getCacheHandler(w, r)
case http.MethodPut:
putCacheHandler(w, r)
case http.MethodDelete:
deleteCacheHandler(w, r)
}
})
}
// handles get requests.
func getCacheHandler(w http.ResponseWriter, r *http.Request) {
target := r.URL.Path[len(cachePath):]
if target == "" {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("can't get a key if there is no key."))
log.Print("empty request.")
return
}
entry, err := cache.Get(target)
if err != nil {
errMsg := (err).Error()
if strings.Contains(errMsg, "not found") {
log.Print(err)
w.WriteHeader(http.StatusNotFound)
return
}
log.Print(err)
w.WriteHeader(http.StatusInternalServerError)
return
}
w.Write(entry)
}
func putCacheHandler(w http.ResponseWriter, r *http.Request) {
target := r.URL.Path[len(cachePath):]
if target == "" {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("can't put a key if there is no key."))
log.Print("empty request.")
return
}
entry, err := ioutil.ReadAll(r.Body)
if err != nil {
log.Print(err)
w.WriteHeader(http.StatusInternalServerError)
return
}
if err := cache.Set(target, []byte(entry)); err != nil {
log.Print(err)
w.WriteHeader(http.StatusInternalServerError)
return
}
log.Printf("stored \"%s\" in cache.", target)
w.WriteHeader(http.StatusCreated)
}
// delete cache objects.
func deleteCacheHandler(w http.ResponseWriter, r *http.Request) {
target := r.URL.Path[len(cachePath):]
if err := cache.Delete(target); err != nil {
if strings.Contains((err).Error(), "not found") {
w.WriteHeader(http.StatusNotFound)
log.Printf("%s not found.", target)
return
}
w.WriteHeader(http.StatusInternalServerError)
log.Printf("internal cache error: %s", err)
}
// this is what the RFC says to use when calling DELETE.
w.WriteHeader(http.StatusOK)
return
}
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