feat: add upstream and verbose flags to command line interface

feat: add upstream support allowing to chain cache servers if needed
fix: tweaked garbage collection to be better

vfs/disk/disk.go

@@ -1,11 +1,13 @@
 package disk
 
 import (
+	"fmt"
 	"os"
 	"path/filepath"
 	"s1d3sw1ped/SteamCache2/steamcache/logger"
 	"s1d3sw1ped/SteamCache2/vfs"
 	"s1d3sw1ped/SteamCache2/vfs/vfserror"
+	"strings"
 	"sync"
 	"time"
 
@@ -82,6 +84,8 @@ func (d *DiskFS) init() {
 		Str("name", d.Name()).
 		Str("root", d.root).
 		Str("capacity", units.HumanSize(float64(d.capacity))).
+		Str("size", units.HumanSize(float64(d.Size()))).
+		Str("files", fmt.Sprint(len(d.info))).
 		Str("duration", time.Since(tstart).String()).
 		Msg("init")
 }
@@ -105,7 +109,8 @@ func (d *DiskFS) walk(path string) {
 			}
 
 			d.mu.Lock()
-			k := npath[len(d.root)+1:]
+			k := strings.ReplaceAll(npath[len(d.root)+1:], "\\", "/")
+			logger.Logger.Debug().Str("name", k).Str("root", d.root).Msg("walk")
 			d.info[k] = vfs.NewFileInfoFromOS(info, k)
 			d.mu.Unlock()
 
@@ -124,9 +129,10 @@ func (d *DiskFS) Name() string {
 }
 
 func (d *DiskFS) Size() int64 {
-	var size int64
 	d.mu.Lock()
 	defer d.mu.Unlock()
+
+	var size int64
 	for _, v := range d.info {
 		size += v.Size()
 	}
@@ -134,24 +140,34 @@ func (d *DiskFS) Size() int64 {
 }
 
 func (d *DiskFS) Set(key string, src []byte) error {
+	if key == "" {
+		return vfserror.ErrInvalidKey
+	}
+	if key[0] == '/' {
+		return vfserror.ErrInvalidKey
+	}
+
 	if d.capacity > 0 {
 		if size := d.Size() + int64(len(src)); size > d.capacity {
 			return vfserror.ErrDiskFull
 		}
 	}
 
+	logger.Logger.Debug().Str("name", key).Str("root", d.root).Msg("set")
+
 	if _, err := d.Stat(key); err == nil {
+		logger.Logger.Debug().Str("name", key).Str("root", d.root).Msg("delete")
 		d.Delete(key)
 	}
 
 	d.mu.Lock()
 	defer d.mu.Unlock()
-	os.MkdirAll(filepath.Join(d.root, filepath.Dir(key)), 0755)
-	if err := os.WriteFile(filepath.Join(d.root, key), src, 0644); err != nil {
+	os.MkdirAll(d.root+"/"+filepath.Dir(key), 0755)
+	if err := os.WriteFile(d.root+"/"+key, src, 0644); err != nil {
 		return err
 	}
 
-	fi, err := os.Stat(filepath.Join(d.root, key))
+	fi, err := os.Stat(d.root + "/" + key)
 	if err != nil {
 		panic(err)
 	}
@@ -163,6 +179,13 @@ func (d *DiskFS) Set(key string, src []byte) error {
 
 // Delete deletes the value of key.
 func (d *DiskFS) Delete(key string) error {
+	if key == "" {
+		return vfserror.ErrInvalidKey
+	}
+	if key[0] == '/' {
+		return vfserror.ErrInvalidKey
+	}
+
 	_, err := d.Stat(key)
 	if err != nil {
 		return err
@@ -170,6 +193,7 @@ func (d *DiskFS) Delete(key string) error {
 
 	d.mu.Lock()
 	defer d.mu.Unlock()
+
 	delete(d.info, key)
 	if err := os.Remove(filepath.Join(d.root, key)); err != nil {
 		return err
@@ -180,6 +204,13 @@ func (d *DiskFS) Delete(key string) error {
 
 // Get gets the value of key and returns it.
 func (d *DiskFS) Get(key string) ([]byte, error) {
+	if key == "" {
+		return nil, vfserror.ErrInvalidKey
+	}
+	if key[0] == '/' {
+		return nil, vfserror.ErrInvalidKey
+	}
+
 	_, err := d.Stat(key)
 	if err != nil {
 		return nil, err
@@ -198,25 +229,23 @@ func (d *DiskFS) Get(key string) ([]byte, error) {
 
 // Stat returns the FileInfo of key. If key is not found in the cache, it will stat the file on disk. If the file is not found on disk, it will return vfs.ErrNotFound.
 func (d *DiskFS) Stat(key string) (*vfs.FileInfo, error) {
-	d.mu.Lock()
-	fi, ok := d.info[key]
-	d.mu.Unlock() // unlock before statting the file
-
-	if !ok {
-		fii, err := os.Stat(filepath.Join(d.root, key))
-		if err != nil {
-			return nil, vfserror.ErrNotFound
-		}
-
-		d.mu.Lock()         // relock to update the info map
-		defer d.mu.Unlock() // nothing else needs to unlock before returning
-
-		d.info[key] = vfs.NewFileInfoFromOS(fii, key)
-		fi = d.info[key]
-		// fallthrough to return fi with shiny new info
+	if key == "" {
+		return nil, vfserror.ErrInvalidKey
+	}
+	if key[0] == '/' {
+		return nil, vfserror.ErrInvalidKey
 	}
 
-	return fi, nil
+	logger.Logger.Debug().Str("name", key).Str("root", d.root).Msg("stat")
+
+	d.mu.Lock()
+	defer d.mu.Unlock()
+
+	if fi, ok := d.info[key]; !ok {
+		return nil, vfserror.ErrNotFound
+	} else {
+		return fi, nil
+	}
 }
 
 func (m *DiskFS) StatAll() []*vfs.FileInfo {