lottsa stuff

cacheFs/cacheFs.go

@@ -0,0 +1,98 @@
+package cachefs
+
+import (
+	"os"
+	"time"
+
+	"github.com/spf13/afero"
+)
+
+// ensure CacheFs implements afero.Fs.
+var _ afero.Fs = &CacheFs{}
+
+// CacheStatus represents the status of a file in the cache.
+type CacheStatus int
+
+const (
+	// CacheHit indicates that the requested file was found in the cache.
+	CacheHit CacheStatus = iota
+
+	// CacheMiss indicates that the requested file was not found in the cache.
+	CacheMiss
+)
+
+type CacheFs struct {
+	// source filesystem
+	source afero.Fs
+
+	// cache filesystem
+	cache afero.Fs
+}
+
+func NewCacheFs(source, cache afero.Fs) *CacheFs {
+	return &CacheFs{
+		source: source,
+		cache:  cache,
+	}
+}
+
+// Create implements the Create method of afero.Fs, ensuring we don't exceed storage limits.
+func (cfs *CacheFs) Create(name string) (afero.File, error) {
+	return cfs.source.Create(name)
+}
+
+func (cfs *CacheFs) Mkdir(name string, perm os.FileMode) error {
+	return cfs.source.Mkdir(name, perm)
+}
+
+func (cfs *CacheFs) MkdirAll(path string, perm os.FileMode) error {
+	return cfs.source.MkdirAll(path, perm)
+}
+
+func (cfs *CacheFs) Open(name string) (afero.File, error) {
+	return cfs.source.Open(name)
+}
+
+func (cfs *CacheFs) OpenFile(name string, flag int, perm os.FileMode) (afero.File, error) {
+	return cfs.source.OpenFile(name, flag, perm)
+}
+
+func (cfs *CacheFs) Remove(name string) error {
+	return cfs.source.Remove(name)
+}
+
+func (cfs *CacheFs) RemoveAll(path string) error {
+	return cfs.source.RemoveAll(path)
+}
+
+func (cfs *CacheFs) Rename(oldname, newname string) error {
+	return cfs.source.Rename(oldname, newname)
+}
+
+func (cfs *CacheFs) Stat(name string) (os.FileInfo, error) {
+	return cfs.source.Stat(name)
+}
+
+func (cfs *CacheFs) Name() string {
+	return "CacheFS"
+}
+
+func (cfs *CacheFs) Chmod(name string, mode os.FileMode) error {
+	return cfs.Chmod(name, mode)
+}
+
+func (cfs *CacheFs) Chown(name string, uid, gid int) error {
+	return cfs.source.Chown(name, uid, gid)
+}
+
+func (cfs *CacheFs) Chtimes(name string, atime time.Time, mtime time.Time) error {
+	return cfs.source.Chtimes(name, atime, mtime)
+}
+
+// ensure CacheFile implements afero.File.
+var _ afero.File = &CacheFile{}
+
+// CacheFile wraps an afero.File to manage space usage on write operations.
+type CacheFile struct {
+	afero.File
+}