fix: remove draft status from release configuration

.goreleaser.yaml

@@ -36,7 +36,6 @@ changelog:
       - "^test:"
 
 release:
-  draft: true
   name_template: '{{.ProjectName}}-{{.Version}}'
   footer: >-
   

.vscode/launch.json

@@ -5,7 +5,7 @@
     "version": "0.2.0",
     "configurations": [
         {
-            "name": "Launch Package",
+            "name": "Launch Memory & Disk",
             "type": "go",
             "request": "launch",
             "mode": "auto",
@@ -18,6 +18,30 @@
                 "--disk-path",
                 "tmp/disk",
             ],
+        },
+        {
+            "name": "Launch Disk Only",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "${workspaceFolder}/main.go",
+            "args": [
+                "--disk",
+                "10G",
+                "--disk-path",
+                "tmp/disk",
+            ],
+        },
+        {
+            "name": "Launch Memory Only",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "${workspaceFolder}/main.go",
+            "args": [
+                "--memory",
+                "1G",
+            ],
         }
     ]
 }

cmd/root.go

@@ -46,9 +46,9 @@ func Execute() {
 }
 
 func init() {
-	rootCmd.Flags().StringVarP(&memory, "memory", "m", "100MB", "The size of the memory cache")
-	rootCmd.Flags().IntVarP(&memorymultiplier, "memory-multiplier", "M", 10, "The multiplier for the memory cache")
-	rootCmd.Flags().StringVarP(&disk, "disk", "d", "10GB", "The size of the disk cache")
-	rootCmd.Flags().IntVarP(&diskmultiplier, "disk-multiplier", "D", 10, "The multiplier for the disk cache")
-	rootCmd.Flags().StringVarP(&diskpath, "disk-path", "p", "tmp/steamcache2-disk", "The path to the disk cache")
+	rootCmd.Flags().StringVarP(&memory, "memory", "m", "0", "The size of the memory cache")
+	rootCmd.Flags().IntVarP(&memorymultiplier, "memory-gc", "M", 10, "The gc value for the memory cache")
+	rootCmd.Flags().StringVarP(&disk, "disk", "d", "0", "The size of the disk cache")
+	rootCmd.Flags().IntVarP(&diskmultiplier, "disk-gc", "D", 100, "The gc value for the disk cache")
+	rootCmd.Flags().StringVarP(&diskpath, "disk-path", "p", "", "The path to the disk cache")
 }

steamcache/avgcachestate/avgcachestate.go

@@ -14,11 +14,15 @@ type AvgCacheState struct {
 
 // New creates a new average cache state with the given size.
 func New(size int) *AvgCacheState {
-	return &AvgCacheState{
+	a := &AvgCacheState{
 		size: size,
 		avgs: make([]cachestate.CacheState, size),
 		mu:   sync.Mutex{},
 	}
+
+	a.Clear()
+
+	return a
 }
 
 // Clear resets the average cache state to zero.
@@ -26,7 +30,9 @@ func (a *AvgCacheState) Clear() {
 	a.mu.Lock()
 	defer a.mu.Unlock()
 
-	a.avgs = make([]cachestate.CacheState, a.size) // zeroed
+	for i := 0; i < len(a.avgs); i++ {
+		a.avgs[i] = cachestate.CacheStateMiss
+	}
 }
 
 // Add adds a cache state to the average cache state.
@@ -45,16 +51,13 @@ func (a *AvgCacheState) Avg() float64 {
 	a.mu.Lock()
 	defer a.mu.Unlock()
 
-	var hits, misses int
+	var hits int
+
 	for _, cs := range a.avgs {
-		switch cs {
-		case cachestate.CacheStateHit:
+		if cs == cachestate.CacheStateHit {
 			hits++
-		case cachestate.CacheStateMiss:
-			misses++
 		}
 	}
-	total := hits + misses
 
-	return float64(hits) / float64(total)
+	return float64(hits) / float64(len(a.avgs))
 }

steamcache/gc.go

@@ -1,73 +1,42 @@
 package steamcache
 
 import (
-	"s1d3sw1ped/SteamCache2/steamcache/logger"
 	"s1d3sw1ped/SteamCache2/vfs"
 	"s1d3sw1ped/SteamCache2/vfs/cachestate"
 	"time"
 
-	"github.com/docker/go-units"
 	"golang.org/x/exp/rand"
 )
 
-func randomgc(vfss vfs.VFS, stats []*vfs.FileInfo) int64 {
-	// Pick a random file to delete
-	randfile := stats[rand.Intn(len(stats))]
-	sz := randfile.Size()
-	err := vfss.Delete(randfile.Name())
-	if err != nil {
-		// If we failed to delete the file, log it and return 0
-		// logger.Logger.Error().Err(err).Msgf("Failed to delete %s", randfile.Name())
-		return 0
+// RandomGC randomly deletes files until we've reclaimed enough space.
+func randomgc(vfss vfs.VFS, size uint) (uint, uint) {
+
+	// Randomly delete files until we've reclaimed enough space.
+	random := func(vfss vfs.VFS, stats []*vfs.FileInfo) int64 {
+		randfile := stats[rand.Intn(len(stats))]
+		sz := randfile.Size()
+		err := vfss.Delete(randfile.Name())
+		if err != nil {
+			return 0
+		}
+
+		return sz
 	}
 
-	return sz
-}
-
-func memorygc(vfss vfs.VFS, size int) {
-	tstart := time.Now()
 	deletions := 0
 	targetreclaim := int64(size)
 	var reclaimed int64
 
 	stats := vfss.StatAll()
 	for {
-		reclaimed += randomgc(vfss, stats)
+		reclaimed += random(vfss, stats)
 		deletions++
 		if reclaimed >= targetreclaim {
 			break
 		}
 	}
 
-	logger.Logger.Info().
-		Str("name", vfss.Name()).
-		Str("duration", time.Since(tstart).String()).
-		Str("reclaimed", units.HumanSize(float64(reclaimed))).
-		Int("deletions", deletions).
-		Msgf("GC")
-}
-
-func diskgc(vfss vfs.VFS, size int) {
-	tstart := time.Now()
-	deletions := 0
-	targetreclaim := int64(size)
-	var reclaimed int64
-
-	stats := vfss.StatAll()
-	for {
-		reclaimed += randomgc(vfss, stats)
-		deletions++
-		if reclaimed >= targetreclaim {
-			break
-		}
-	}
-
-	logger.Logger.Info().
-		Str("name", vfss.Name()).
-		Str("duration", time.Since(tstart).String()).
-		Str("reclaimed", units.HumanSize(float64(reclaimed))).
-		Int("deletions", deletions).
-		Msgf("GC")
+	return uint(reclaimed), uint(deletions)
 }
 
 func cachehandler(fi *vfs.FileInfo, cs cachestate.CacheState) bool {

steamcache/steamcache.go

@@ -30,6 +30,9 @@ type SteamCache struct {
 	memory *memory.MemoryFS
 	disk   *disk.DiskFS
 
+	memorygc *gc.GCFS
+	diskgc   *gc.GCFS
+
 	hits *avgcachestate.AvgCacheState
 
 	dirty bool
@@ -47,35 +50,64 @@ func New(address string, memorySize string, memoryMultiplier int, diskSize strin
 		panic(err)
 	}
 
-	m := memory.New(memorysize)
-	d := disk.New(diskPath, disksize)
+	c := cache.New(
+		cachehandler,
+	)
+
+	var m *memory.MemoryFS
+	var mgc *gc.GCFS
+	if memorysize > 0 {
+		m = memory.New(memorysize)
+		mgc = gc.New(m, memoryMultiplier, randomgc)
+	}
+
+	var d *disk.DiskFS
+	var dgc *gc.GCFS
+	if disksize > 0 {
+		d = disk.New(diskPath, disksize)
+		dgc = gc.New(d, diskMultiplier, randomgc)
+	}
+
+	// configure the cache to match the specified mode (memory only, disk only, or memory and disk) based on the provided sizes
+	if disksize == 0 && memorysize != 0 {
+		//memory only mode - no disk
+
+		c.SetSlow(mgc)
+		logger.Logger.Info().Bool("memory", true).Bool("disk", false).Msg("configuration")
+	} else if disksize != 0 && memorysize == 0 {
+		// disk only mode
+
+		c.SetSlow(dgc)
+		logger.Logger.Info().Bool("memory", false).Bool("disk", true).Msg("configuration")
+	} else if disksize != 0 && memorysize != 0 {
+		// memory and disk mode
+
+		c.SetFast(mgc)
+		c.SetSlow(dgc)
+		logger.Logger.Info().Bool("memory", true).Bool("disk", true).Msg("configuration")
+	} else {
+		// no memory or disk isn't a valid configuration
+		logger.Logger.Error().Bool("memory", false).Bool("disk", false).Msg("configuration invalid :( exiting")
+		os.Exit(1)
+	}
 
 	sc := &SteamCache{
 		address: address,
-		vfs: syncfs.New(
-			cache.New(
-				gc.New(
-					m,
-					memoryMultiplier,
-					memorygc,
-				),
-				gc.New(
-					d,
-					diskMultiplier,
-					diskgc,
-				),
-				cachehandler,
-			),
-		),
+		vfs:     syncfs.New(c),
 
 		memory: m,
 		disk:   d,
 
-		hits: avgcachestate.New(10000),
+		memorygc: mgc,
+		diskgc:   dgc,
+
+		hits: avgcachestate.New(100),
 	}
 
-	if d.Size() > d.Capacity() {
-		diskgc(d, int(d.Size()-d.Capacity()))
+	if d != nil {
+		if d.Size() > d.Capacity() {
+			randomgc(d, uint(d.Size()-d.Capacity()))
+		}
 	}
 
 	return sc
@@ -89,7 +121,7 @@ func (sc *SteamCache) Run() {
 	sc.mu.Unlock()
 
 	sc.LogStats()
-	t := time.NewTicker(10 * time.Second)
+	t := time.NewTicker(1 * time.Second)
 	go func() {
 		for range t.C {
 			sc.LogStats()
@@ -111,11 +143,49 @@ func (sc *SteamCache) LogStats() {
 	sc.mu.Lock()
 	defer sc.mu.Unlock()
 	if sc.dirty {
+
+		logger.Logger.Info().Msg("") // empty line to separate log entries for better readability
+
+		if sc.memory != nil { // only log memory if memory is enabled
+			lifetimeBytes, lifetimeFiles, reclaimedBytes, deletedFiles, gcTime := sc.memorygc.Stats()
+
+			logger.Logger.Info().
+				Str("size", units.HumanSize(float64(sc.memory.Size()))).
+				Str("capacity", units.HumanSize(float64(sc.memory.Capacity()))).
+				Str("files", fmt.Sprintf("%d", len(sc.memory.StatAll()))).
+				Msg("memory")
+
+			logger.Logger.Info().
+				Str("data_total", units.HumanSize(float64(lifetimeBytes))).
+				Uint("files_total", lifetimeFiles).
+				Str("data", units.HumanSize(float64(reclaimedBytes))).
+				Uint("files", deletedFiles).
+				Str("gc_time", gcTime.String()).
+				Msg("memory_gc")
+		}
+
+		if sc.disk != nil { // only log disk if disk is enabled
+			lifetimeBytes, lifetimeFiles, reclaimedBytes, deletedFiles, gcTime := sc.diskgc.Stats()
+
+			logger.Logger.Info().
+				Str("size", units.HumanSize(float64(sc.disk.Size()))).
+				Str("capacity", units.HumanSize(float64(sc.disk.Capacity()))).
+				Str("files", fmt.Sprintf("%d", len(sc.disk.StatAll()))).
+				Msg("disk")
+
+			logger.Logger.Info().
+				Str("data_total", units.HumanSize(float64(lifetimeBytes))).
+				Uint("files_total", lifetimeFiles).
+				Str("data", units.HumanSize(float64(reclaimedBytes))).
+				Uint("files", deletedFiles).
+				Str("gc_time", gcTime.String()).
+				Msg("disk_gc")
+		}
+
 		logger.Logger.Info().
-			Str("memory", fmt.Sprintf("%s/%s", units.HumanSize(float64(sc.memory.Size())), units.HumanSize(float64(sc.memory.Capacity())))).Int("memory-files", len(sc.memory.StatAll())).
-			Str("disk", fmt.Sprintf("%s/%s", units.HumanSize(float64(sc.disk.Size())), units.HumanSize(float64(sc.disk.Capacity())))).Int("disk-files", len(sc.disk.StatAll())).
 			Str("hitrate", fmt.Sprintf("%.2f%%", sc.hits.Avg()*100)).
-			Msg("stats")
+			Msg("cache")
+
 		sc.dirty = false
 	}
 }

vfs/cache/cache.go

@@ -21,23 +21,24 @@ type CacheFS struct {
 type CacheHandler func(*vfs.FileInfo, cachestate.CacheState) bool
 
 // New creates a new CacheFS. fast is used for caching, and slow is used for storage. fast should obviously be faster than slow.
-func New(fast, slow vfs.VFS, cacheHandler CacheHandler) *CacheFS {
-	if slow == nil {
-		panic("slow is nil")
-	}
-
-	if fast == slow {
-		panic("fast and slow are the same")
-	}
-
+func New(cacheHandler CacheHandler) *CacheFS {
 	return &CacheFS{
-		fast: fast,
-		slow: slow,
-
 		cacheHandler: cacheHandler,
 	}
 }
 
+func (c *CacheFS) SetSlow(vfs vfs.VFS) {
+	if vfs == nil {
+		panic("vfs is nil") // panic if the vfs is nil
+	}
+
+	c.slow = vfs
+}
+
+func (c *CacheFS) SetFast(vfs vfs.VFS) {
+	c.fast = vfs
+}
+
 // cacheState returns the state of the file at key.
 func (c *CacheFS) cacheState(key string) cachestate.CacheState {
 	if c.fast != nil {

vfs/cache/cache_test.go

@@ -20,7 +20,9 @@ func TestNew(t *testing.T) {
 	fast := testMemory()
 	slow := testMemory()
 
-	cache := New(fast, slow, nil)
+	cache := New(nil)
+	cache.SetFast(fast)
+	cache.SetSlow(slow)
 	if cache == nil {
 		t.Fatal("expected cache to be non-nil")
 	}
@@ -35,7 +37,9 @@ func TestNewPanics(t *testing.T) {
 		}
 	}()
 
-	New(nil, nil, nil)
+	cache := New(nil)
+	cache.SetFast(nil)
+	cache.SetSlow(nil)
 }
 
 func TestSetAndGet(t *testing.T) {
@@ -43,7 +47,9 @@ func TestSetAndGet(t *testing.T) {
 
 	fast := testMemory()
 	slow := testMemory()
-	cache := New(fast, slow, nil)
+	cache := New(nil)
+	cache.SetFast(fast)
+	cache.SetSlow(slow)
 
 	key := "test"
 	value := []byte("value")
@@ -66,7 +72,8 @@ func TestSetAndGetNoFast(t *testing.T) {
 	t.Parallel()
 
 	slow := testMemory()
-	cache := New(nil, slow, nil)
+	cache := New(nil)
+	cache.SetSlow(slow)
 
 	key := "test"
 	value := []byte("value")
@@ -89,9 +96,11 @@ func TestCaching(t *testing.T) {
 
 	fast := testMemory()
 	slow := testMemory()
-	cache := New(fast, slow, func(fi *vfs.FileInfo, cs cachestate.CacheState) bool {
+	cache := New(func(fi *vfs.FileInfo, cs cachestate.CacheState) bool {
 		return true
 	})
+	cache.SetFast(fast)
+	cache.SetSlow(slow)
 
 	key := "test"
 	value := []byte("value")
@@ -148,7 +157,9 @@ func TestGetNotFound(t *testing.T) {
 
 	fast := testMemory()
 	slow := testMemory()
-	cache := New(fast, slow, nil)
+	cache := New(nil)
+	cache.SetFast(fast)
+	cache.SetSlow(slow)
 
 	_, err := cache.Get("nonexistent")
 	if !errors.Is(err, vfserror.ErrNotFound) {
@@ -161,7 +172,9 @@ func TestDelete(t *testing.T) {
 
 	fast := testMemory()
 	slow := testMemory()
-	cache := New(fast, slow, nil)
+	cache := New(nil)
+	cache.SetFast(fast)
+	cache.SetSlow(slow)
 
 	key := "test"
 	value := []byte("value")
@@ -185,7 +198,9 @@ func TestStat(t *testing.T) {
 
 	fast := testMemory()
 	slow := testMemory()
-	cache := New(fast, slow, nil)
+	cache := New(nil)
+	cache.SetFast(fast)
+	cache.SetSlow(slow)
 
 	key := "test"
 	value := []byte("value")

vfs/disk/disk.go

@@ -27,6 +27,24 @@ type DiskFS struct {
 
 // New creates a new DiskFS.
 func new(root string, capacity int64, skipinit bool) *DiskFS {
+	if capacity <= 0 {
+		panic("disk capacity must be greater than 0") // panic if the capacity is less than or equal to 0
+	}
+
+	if root == "" {
+		panic("disk root must not be empty") // panic if the root is empty
+	}
+
+	fi, err := os.Stat(root)
+	if err != nil {
+		if !os.IsNotExist(err) {
+			panic(err) // panic if the error is something other than not found
+		}
+	}
+	if !fi.IsDir() {
+		panic("disk root must be a directory") // panic if the root is not a directory
+	}
+
 	dfs := &DiskFS{
 		root:     root,
 		info:     make(map[string]*vfs.FileInfo),
@@ -60,7 +78,12 @@ func (d *DiskFS) init() {
 	d.walk(d.root)
 	d.sg.Wait()
 
-	logger.Logger.Info().Str("name", d.Name()).Str("root", d.root).Str("capacity", units.HumanSize(float64(d.capacity))).Str("duration", time.Since(tstart).String()).Msg("init")
+	logger.Logger.Info().
+		Str("name", d.Name()).
+		Str("root", d.root).
+		Str("capacity", units.HumanSize(float64(d.capacity))).
+		Str("duration", time.Since(tstart).String()).
+		Msg("init")
 }
 
 func (d *DiskFS) walk(path string) {

vfs/gc/gc.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"s1d3sw1ped/SteamCache2/vfs"
 	"s1d3sw1ped/SteamCache2/vfs/vfserror"
+	"sync"
+	"time"
 )
 
 // Ensure GCFS implements VFS.
@@ -12,14 +14,23 @@ var _ vfs.VFS = (*GCFS)(nil)
 // GCFS is a virtual file system that calls a GC handler when the disk is full. The GC handler is responsible for freeing up space on the disk. The GCFS is a wrapper around another VFS.
 type GCFS struct {
 	vfs.VFS
-	multiplier   int
-	gcHanderFunc GCHandlerFunc
+	multiplier int
+
+	// protected by mu
+	gcHanderFunc                 GCHandlerFunc
+	lifetimeBytes, lifetimeFiles uint
+	reclaimedBytes, deletedFiles uint
+	gcTime                       time.Duration
+	mu                           sync.Mutex
 }
 
 // GCHandlerFunc is a function that is called when the disk is full and the GCFS needs to free up space. It is passed the VFS and the size of the file that needs to be written. Its up to the implementation to free up space. How much space is freed is also up to the implementation.
-type GCHandlerFunc func(vfs vfs.VFS, size int)
+type GCHandlerFunc func(vfs vfs.VFS, size uint) (reclaimedBytes uint, deletedFiles uint)
 
 func New(vfs vfs.VFS, multiplier int, gcHandlerFunc GCHandlerFunc) *GCFS {
+	if multiplier <= 0 {
+		multiplier = 1 // if the multiplier is less than or equal to 0 set it to 1 will be slow but the user can set it to a higher value if they want
+	}
 	return &GCFS{
 		VFS:          vfs,
 		multiplier:   multiplier,
@@ -27,13 +38,44 @@ func New(vfs vfs.VFS, multiplier int, gcHandlerFunc GCHandlerFunc) *GCFS {
 	}
 }
 
+// Stats returns the lifetime bytes, lifetime files, reclaimed bytes and deleted files.
+// The lifetime bytes and lifetime files are the total bytes and files that have been freed up by the GC handler.
+// The reclaimed bytes and deleted files are the bytes and files that have been freed up by the GC handler since last call to Stats.
+// The gc time is the total time spent in the GC handler since last call to Stats.
+// The reclaimed bytes and deleted files and gc time are reset to 0 after the call to Stats.
+func (g *GCFS) Stats() (lifetimeBytes, lifetimeFiles, reclaimedBytes, deletedFiles uint, gcTime time.Duration) {
+	g.mu.Lock()
+	defer g.mu.Unlock()
+
+	g.lifetimeBytes += g.reclaimedBytes
+	g.lifetimeFiles += g.deletedFiles
+
+	lifetimeBytes = g.lifetimeBytes
+	lifetimeFiles = g.lifetimeFiles
+	reclaimedBytes = g.reclaimedBytes
+	deletedFiles = g.deletedFiles
+	gcTime = g.gcTime
+
+	g.reclaimedBytes = 0
+	g.deletedFiles = 0
+	g.gcTime = time.Duration(0)
+
+	return
+}
+
 // Set overrides the Set method of the VFS interface. It tries to set the key and src, if it fails due to disk full error, it calls the GC handler and tries again. If it still fails it returns the error.
 func (g *GCFS) Set(key string, src []byte) error {
+	g.mu.Lock()
+	defer g.mu.Unlock()
 	err := g.VFS.Set(key, src) // try to set the key and src
 
 	if err == vfserror.ErrDiskFull && g.gcHanderFunc != nil { // if the error is disk full and there is a GC handler
-		g.gcHanderFunc(g.VFS, len(src)*g.multiplier) // call the GC handler
-		err = g.VFS.Set(key, src)                    // try again after GC if it still fails return the error
+		tstart := time.Now()
+		reclaimedBytes, deletedFiles := g.gcHanderFunc(g.VFS, uint(len(src)*g.multiplier)) // call the GC handler
+		g.gcTime += time.Since(tstart)
+		g.reclaimedBytes += reclaimedBytes
+		g.deletedFiles += deletedFiles
+		err = g.VFS.Set(key, src) // try again after GC if it still fails return the error
 	}
 
 	return err

vfs/gc/gc_test.go

@@ -6,7 +6,6 @@ import (
 	"s1d3sw1ped/SteamCache2/vfs/memory"
 	"sort"
 	"testing"
-	"time"
 
 	"golang.org/x/exp/rand"
 )
@@ -15,13 +14,11 @@ func TestGCSmallRandom(t *testing.T) {
 	t.Parallel()
 
 	m := memory.New(1024 * 1024 * 16)
-	gc := New(m, 10, func(vfs vfs.VFS, size int) {
-		tstart := time.Now()
+	gc := New(m, 10, func(vfs vfs.VFS, size uint) (uint, uint) {
 		deletions := 0
-		targetreclaim := int64(size)
-		var reclaimed int64
+		var reclaimed uint
 
-		t.Logf("GC starting to reclaim %d bytes", targetreclaim)
+		t.Logf("GC starting to reclaim %d bytes", size)
 
 		stats := vfs.StatAll()
 		sort.Slice(stats, func(i, j int) bool {
@@ -31,7 +28,7 @@ func TestGCSmallRandom(t *testing.T) {
 
 		// Delete the oldest files until we've reclaimed enough space.
 		for _, s := range stats {
-			sz := s.Size() // Get the size of the file
+			sz := uint(s.Size()) // Get the size of the file
 			err := vfs.Delete(s.Name())
 			if err != nil {
 				panic(err)
@@ -41,12 +38,11 @@ func TestGCSmallRandom(t *testing.T) {
 
 			// t.Logf("GC deleting %s, %v", s.Name(), s.AccessTime().Format(time.RFC3339Nano))
 
-			if reclaimed >= targetreclaim { // We've reclaimed enough space
+			if reclaimed >= size { // We've reclaimed enough space
 				break
 			}
 		}
-
-		t.Logf("GC took %v to reclaim %d bytes by deleting %d files", time.Since(tstart), reclaimed, deletions)
+		return uint(reclaimed), uint(deletions)
 	})
 
 	for i := 0; i < 10000; i++ {
@@ -70,13 +66,11 @@ func TestGCLargeRandom(t *testing.T) {
 	t.Parallel()
 
 	m := memory.New(1024 * 1024 * 16) // 16MB
-	gc := New(m, 10, func(vfs vfs.VFS, size int) {
-		tstart := time.Now()
+	gc := New(m, 10, func(vfs vfs.VFS, size uint) (uint, uint) {
 		deletions := 0
-		targetreclaim := int64(size)
-		var reclaimed int64
+		var reclaimed uint
 
-		t.Logf("GC starting to reclaim %d bytes", targetreclaim)
+		t.Logf("GC starting to reclaim %d bytes", size)
 
 		stats := vfs.StatAll()
 		sort.Slice(stats, func(i, j int) bool {
@@ -86,17 +80,17 @@ func TestGCLargeRandom(t *testing.T) {
 
 		// Delete the oldest files until we've reclaimed enough space.
 		for _, s := range stats {
-			sz := s.Size() // Get the size of the file
+			sz := uint(s.Size()) // Get the size of the file
 			vfs.Delete(s.Name())
 			reclaimed += sz // Track how much space we've reclaimed
 			deletions++     // Track how many files we've deleted
 
-			if reclaimed >= targetreclaim { // We've reclaimed enough space
+			if reclaimed >= size { // We've reclaimed enough space
 				break
 			}
 		}
 
-		t.Logf("GC took %v to reclaim %d bytes by deleting %d files", time.Since(tstart), reclaimed, deletions)
+		return uint(reclaimed), uint(deletions)
 	})
 
 	for i := 0; i < 10000; i++ {

vfs/memory/memory.go

@@ -25,6 +25,10 @@ type MemoryFS struct {
 
 // New creates a new MemoryFS.
 func New(capacity int64) *MemoryFS {
+	if capacity <= 0 {
+		panic("memory capacity must be greater than 0") // panic if the capacity is less than or equal to 0
+	}
+
 	return &MemoryFS{
 		files:    make(map[string]*file),
 		capacity: capacity,