implemented persistence

internal/report.go

@@ -75,8 +75,8 @@ func WithSelector(s Selector) Option {
 }
 
 type Store interface {
-	Load() (map[string]*FillerQueue, error)
-	Save(map[string]*FillerQueue) error
+	Load(context.Context) (map[string]*FillerQueue, error)
+	Save(context.Context, map[string]*FillerQueue) error
 }
 
 func WithStore(s Store) Option {
@@ -93,7 +93,7 @@ func BuildReport(ctx context.Context, reader RecordReader, writer ReportWriter,
 		store:    EphemeralStore{},
 	}, options)
 
-	buys, err := optionals.store.Load()
+	buys, err := optionals.store.Load(ctx)
 	if err != nil {
 		return fmt.Errorf("loading state: %w", err)
 	}
@@ -117,7 +117,7 @@ func BuildReport(ctx context.Context, reader RecordReader, writer ReportWriter,
 			rec, err := reader.ReadRecord(ctx)
 			if err != nil {
 				if errors.Is(err, io.EOF) {
-					err = optionals.store.Save(buys)
+					err = optionals.store.Save(ctx, buys)
 					if err != nil {
 						return fmt.Errorf("saving state: %w", err)
 					}
@@ -182,12 +182,6 @@ func processRecord(ctx context.Context, q *FillerQueue, rec Record, sel Selector
 				return ErrInsufficientBoughtVolume
 			}
 
-			// Since we don't apply selectors while processing buys we need to apply them here, before we
-			// actually use them.
-			if !sel(buy) {
-				continue
-			}
-
 			matchedQty, filled := buy.Fill(unmatchedQty)
 
 			if filled {