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

steamcache/steamcache_test.go

@@ -0,0 +1,71 @@
+package steamcache
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestCaching(t *testing.T) {
+	t.Parallel()
+
+	td := t.TempDir()
+
+	os.WriteFile(filepath.Join(td, "key2"), []byte("value2"), 0644)
+
+	sc := New("localhost:8080", "1GB", 10, "1GB", 100, td, "", false)
+
+	sc.dirty = true
+	sc.LogStats()
+
+	if err := sc.vfs.Set("key", []byte("value")); err != nil {
+		t.Errorf("Set failed: %v", err)
+	}
+	if err := sc.vfs.Set("key1", []byte("value1")); err != nil {
+		t.Errorf("Set failed: %v", err)
+	}
+
+	sc.dirty = true
+	sc.LogStats()
+
+	if sc.diskgc.Size() != 17 {
+		t.Errorf("Size failed: got %d, want %d", sc.diskgc.Size(), 17)
+	}
+
+	if sc.vfs.Size() != 17 {
+		t.Errorf("Size failed: got %d, want %d", sc.vfs.Size(), 17)
+	}
+
+	if d, err := sc.vfs.Get("key"); err != nil {
+		t.Errorf("Get failed: %v", err)
+	} else if string(d) != "value" {
+		t.Errorf("Get failed: got %s, want %s", d, "value")
+	}
+
+	if d, err := sc.vfs.Get("key1"); err != nil {
+		t.Errorf("Get failed: %v", err)
+	} else if string(d) != "value1" {
+		t.Errorf("Get failed: got %s, want %s", d, "value1")
+	}
+
+	if d, err := sc.vfs.Get("key2"); err != nil {
+		t.Errorf("Get failed: %v", err)
+	} else if string(d) != "value2" {
+		t.Errorf("Get failed: got %s, want %s", d, "value2")
+	}
+
+	if sc.diskgc.Size() != 17 {
+		t.Errorf("Size failed: got %d, want %d", sc.diskgc.Size(), 17)
+	}
+
+	if sc.vfs.Size() != 17 {
+		t.Errorf("Size failed: got %d, want %d", sc.vfs.Size(), 17)
+	}
+
+	sc.memory.Delete("key2")
+	os.Remove(filepath.Join(td, "key2"))
+
+	if _, err := sc.vfs.Get("key2"); err == nil {
+		t.Errorf("Get failed: got nil, want error")
+	}
+}