Additions to domain/ and workspace/ chron-note packages

chron-note/internal/workspace/io.go

@@ -0,0 +1,69 @@
+package workspace
+
+import (
+	"fmt"
+	"os"
+
+	"git.michelsen.id/phill/chron/chron-note/internal/domain"
+)
+
+func (ws *Workspace) Exists(id domain.ObjectID) (bool, error) {
+	_, err := os.Stat(ws.ObjectPath(id))
+	if err == nil {
+		return true, nil
+	}
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+	return false, fmt.Errorf("stat object %s: %w", id.String(), err)
+}
+
+func (ws *Workspace) Read(id domain.ObjectID) ([]byte, error) {
+	b, err := os.ReadFile(ws.ObjectPath(id))
+	if err != nil {
+		return nil, fmt.Errorf("read object %s: %w", id.String(), err)
+	}
+	return b, nil
+}
+
+func (ws *Workspace) Write(id domain.ObjectID, b []byte) error {
+	if err := os.MkdirAll(ws.Dir, 0o755); err != nil {
+		return fmt.Errorf("mkdir workspace dir: %w", err)
+	}
+
+	dst := ws.ObjectPath(id)
+
+	f, err := os.CreateTemp(ws.Dir, id.String()+".*.tmp")
+	if err != nil {
+		return fmt.Errorf("create temp for object %s: %w", id.String(), err)
+	}
+	tmp := f.Name()
+
+	// Best-effort cleanup on failure.
+	defer func() { _ = os.Remove(tmp) }()
+
+	if _, err := f.Write(b); err != nil {
+		_ = f.Close()
+		return fmt.Errorf("write temp for object %s: %w", id.String(), err)
+	}
+	if err := f.Close(); err != nil {
+		return fmt.Errorf("close temp for object %s: %w", id.String(), err)
+	}
+
+	if err := os.Rename(tmp, dst); err != nil {
+		return fmt.Errorf("rename temp for object %s: %w", id.String(), err)
+	}
+
+	// Rename succeeded; prevent deferred cleanup.
+	_ = os.Remove(tmp)
+	return nil
+}
+
+func (ws *Workspace) Delete(id domain.ObjectID) error {
+	p := ws.ObjectPath(id)
+	err := os.Remove(p)
+	if err == nil || os.IsNotExist(err) {
+		return nil
+	}
+	return fmt.Errorf("delete object %s: %w", id.String(), err)
+}