Rename filesystem interfaces and structs

server/internal/storage/filesystem.go

@@ -0,0 +1,47 @@
+package storage
+
+import (
+	"io/fs"
+	"os"
+)
+
+// fileSystem defines the interface for filesystem operations
+type fileSystem interface {
+	ReadFile(path string) ([]byte, error)
+	WriteFile(path string, data []byte, perm fs.FileMode) error
+	Remove(path string) error
+	MkdirAll(path string, perm fs.FileMode) error
+	RemoveAll(path string) error
+	ReadDir(path string) ([]fs.DirEntry, error)
+	Stat(path string) (fs.FileInfo, error)
+	IsNotExist(err error) bool
+}
+
+// osFS implements the FileSystem interface using the real filesystem.
+type osFS struct{}
+
+// ReadFile reads the file at the given path.
+func (f *osFS) ReadFile(path string) ([]byte, error) { return os.ReadFile(path) }
+
+// WriteFile writes the given data to the file at the given path.
+func (f *osFS) WriteFile(path string, data []byte, perm fs.FileMode) error {
+	return os.WriteFile(path, data, perm)
+}
+
+// Remove deletes the file at the given path.
+func (f *osFS) Remove(path string) error { return os.Remove(path) }
+
+// MkdirAll creates the directory at the given path and any necessary parents.
+func (f *osFS) MkdirAll(path string, perm fs.FileMode) error { return os.MkdirAll(path, perm) }
+
+// RemoveAll removes the file or directory at the given path.
+func (f *osFS) RemoveAll(path string) error { return os.RemoveAll(path) }
+
+// ReadDir reads the directory at the given path.
+func (f *osFS) ReadDir(path string) ([]fs.DirEntry, error) { return os.ReadDir(path) }
+
+// Stat returns the FileInfo for the file at the given path.
+func (f *osFS) Stat(path string) (fs.FileInfo, error) { return os.Stat(path) }
+
+// IsNotExist returns true if the error is a "file does not exist" error.
+func (f *osFS) IsNotExist(err error) bool { return os.IsNotExist(err) }