initial commit

cmd/cachefs/main.go

@@ -0,0 +1,64 @@
+// Copyright (C) 2022 Marius Schellenberger
+
+package main
+
+import (
+	"context"
+	"flag"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"cachefs/pkg/fs"
+	"cachefs/pkg/srv"
+
+	"github.com/go-logr/logr"
+	"k8s.io/klog/v2"
+	"k8s.io/klog/v2/klogr"
+)
+
+var (
+	version string
+
+	src      string
+	dst      string
+	metadata string
+	listen   string
+
+	log logr.Logger
+)
+
+func main() {
+	klog.InitFlags(nil)
+	flag.StringVar(&src, "src", "", "root directory (NFS share)")
+	flag.StringVar(&dst, "dst", "", "local directory to cache files")
+	flag.StringVar(&metadata, "data", "", "path to metadata file")
+	flag.StringVar(&listen, "listen", "127.0.0.1:8080", "listen addr:port")
+	flag.Parse()
+
+	log = klogr.New().WithName("main")
+	log.Info("starting cachefs", "version", version)
+
+	fs, err := fs.NewFS(src, dst, metadata, klogr.New().WithName("fs"))
+	if err != nil {
+		klog.Fatalf("init failed: %s", err)
+	}
+	s := &http.Server{Addr: listen, Handler: srv.NewFileServer(fs, klogr.New().WithName("server"))}
+	go func() {
+		err := s.ListenAndServe()
+		if err != nil && err != http.ErrServerClosed {
+			klog.Fatalf("init failed: %s", err)
+		}
+	}()
+	sigs := make(chan os.Signal, 1)
+	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
+	<-sigs
+	log.Info("cachefs shutdown initiated")
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
+	s.Shutdown(ctx)
+	fs.Close()
+	cancel()
+	log.Info("cachefs shutdown completed")
+}