Implemented listenrbainz.ExportArchive.IterFeedback

internal/listenbrainz/archive.go

@@ -23,6 +23,7 @@ package listenbrainz
 
 import (
 	"encoding/json"
+	"errors"
 	"io"
 	"iter"
 	"regexp"
@@ -54,6 +55,9 @@ func OpenExportArchive(path string) (*ExportArchive, error) {
 
 // Close the archive and release any resources.
 func (a *ExportArchive) Close() error {
+	if a.backend == nil {
+		return nil
+	}
 	return a.backend.Close()
 }
 
@@ -126,8 +130,8 @@ func (a *ExportArchive) IterListens(minTimestamp time.Time) iter.Seq2[Listen, er
 				continue
 			}
 
-			f := NewExportFile(file.f)
-			for l, err := range f.IterListens() {
+			f := JSONLFile[Listen]{file: file.f}
+			for l, err := range f.IterItems() {
 				if err != nil {
 					yield(Listen{}, err)
 					return
@@ -144,6 +148,36 @@ func (a *ExportArchive) IterListens(minTimestamp time.Time) iter.Seq2[Listen, er
 	}
 }
 
+// Yields all feedbacks from the archive that are newer than the given timestamp.
+// The feedbacks are yielded in ascending order of their Created timestamp.
+func (a *ExportArchive) IterFeedback(minTimestamp time.Time) iter.Seq2[Feedback, error] {
+	return func(yield func(Feedback, error) bool) {
+		files, err := a.backend.Glob("feedback.jsonl")
+		if err != nil {
+			yield(Feedback{}, err)
+			return
+		} else if len(files) == 0 {
+			yield(Feedback{}, errors.New("no feedback.jsonl file found in archive"))
+			return
+		}
+
+		j := JSONLFile[Feedback]{file: files[0].File}
+		for l, err := range j.IterItems() {
+			if err != nil {
+				yield(Feedback{}, err)
+				return
+			}
+
+			if !time.Unix(l.Created, 0).After(minTimestamp) {
+				continue
+			}
+			if !yield(l, nil) {
+				break
+			}
+		}
+	}
+}
+
 type UserInfo struct {
 	ID   string `json:"user_id"`
 	Name string `json:"username"`
@@ -160,15 +194,11 @@ type ListenExportFileInfo struct {
 	f         archive.OpenableFile
 }
 
-type ListenExportFile struct {
+type JSONLFile[T any] struct {
 	file archive.OpenableFile
 }
 
-func NewExportFile(f archive.OpenableFile) ListenExportFile {
-	return ListenExportFile{file: f}
-}
-
-func (f *ListenExportFile) openReader() (*jsonl.Reader, error) {
+func (f *JSONLFile[T]) openReader() (*jsonl.Reader, error) {
 	fio, err := f.file.Open()
 	if err != nil {
 		return nil, err
@@ -177,17 +207,18 @@ func (f *ListenExportFile) openReader() (*jsonl.Reader, error) {
 	return &reader, nil
 }
 
-func (f *ListenExportFile) IterListens() iter.Seq2[Listen, error] {
-	return func(yield func(Listen, error) bool) {
+func (f *JSONLFile[T]) IterItems() iter.Seq2[T, error] {
+	return func(yield func(T, error) bool) {
 		reader, err := f.openReader()
 		if err != nil {
-			yield(Listen{}, err)
+			var listen T
+			yield(listen, err)
 			return
 		}
 		defer reader.Close()
 
 		for {
-			listen := Listen{}
+			var listen T
 			err := reader.ReadSingleLine(&listen)
 			if err != nil {
 				break