implmented fetch on cache miss

main.go

@@ -3,17 +3,21 @@ package main
 import (
 	"log"
 	"net/http"
-	"os"
-	"path/filepath"
+
+	"gitea.ewpt3ch.dev/ewpt3ch/pkgstash/internal/cache"
 )
 
 const repoRoot = "/home/ewpt3ch/dev/pacman-cache-server/tmprepo"
 
 func main() {
 	const port = "8090"
+	cfg := NewConfig()
+	c := cache.NewCache(cfg.RepoPath, cfg.MirrorURL)
 
 	mux := http.NewServeMux()
-	mux.HandleFunc("GET /{repo}/os/{arch}/{file}", handlePackage)
+	mux.HandleFunc("GET /{repo}/os/{arch}/{file}", func(w http.ResponseWriter, req *http.Request) {
+		handlePackage(w, req, c)
+	})
 
 	httpServe := &http.Server{
 		Addr:    ":" + port,
@@ -23,21 +27,3 @@ func main() {
 	log.Fatal(httpServe.ListenAndServe())
 
 }
-
-func handlePackage(w http.ResponseWriter, req *http.Request) {
-	repo := req.PathValue("repo")
-	arch := req.PathValue("arch")
-	file := req.PathValue("file")
-
-	filePath := filepath.Join(repoRoot, repo, "os", arch, file)
-	// is where we handle cache misses and fetch the file
-	// from a mirror, for now we send a 404
-	if _, err := os.Stat(filePath); err != nil {
-		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
-		w.WriteHeader(404)
-		w.Write([]byte("No such file"))
-		return
-	}
-
-	http.ServeFile(w, req, filePath)
-}