support attach labels to rule result

pkg/schedule/rule/periodic.go

@@ -119,6 +119,12 @@ func (r *periodic) execute(ctx context.Context, now time.Time) error {
 		return nil
 	}
 
+	// Attach labels to feeds.
+	for _, feed := range feeds {
+		feed.Labels = append(feed.Labels, config.labels...)
+		feed.Labels.EnsureSorted()
+	}
+
 	// Notify.
 	r.Dependencies().Out <- &Result{
 		Rule:  config.Name,

pkg/schedule/rule/rule.go

@@ -22,6 +22,7 @@ import (
 	"github.com/pkg/errors"
 
 	"github.com/glidea/zenfeed/pkg/component"
+	"github.com/glidea/zenfeed/pkg/model"
 	"github.com/glidea/zenfeed/pkg/storage/feed"
 	"github.com/glidea/zenfeed/pkg/storage/feed/block"
 )
@@ -37,6 +38,8 @@ type Config struct {
 	Query        string
 	Threshold    float32
 	LabelFilters []string
+	Labels       map[string]string
+	labels       model.Labels
 
 	// Periodic type.
 	EveryDay   string // e.g. "00:00~23:59", or "-22:00~7:00" (yesterday 22:00 to today 07:00)
@@ -63,6 +66,9 @@ func (c *Config) Validate() error { //nolint:cyclop,gocognit
 	if c.Threshold < 0 || c.Threshold > 1 {
 		return errors.New("threshold must be between 0 and 1")
 	}
+	if len(c.Labels) > 0 {
+		c.labels.FromMap(c.Labels)
+	}
 	if c.EveryDay != "" && c.WatchInterval != 0 {
 		return errors.New("every_day and watch_interval cannot both be set")
 	}

pkg/schedule/rule/watch.go

@@ -101,6 +101,12 @@ func (r *watch) execute(ctx context.Context, start, end time.Time) error {
 		return nil
 	}
 
+	// Attach labels to feeds.
+	for _, feed := range feeds {
+		feed.Labels = append(feed.Labels, config.labels...)
+		feed.Labels.EnsureSorted()
+	}
+
 	// Split feeds by start time.
 	feedsByStart := make(map[time.Time][]*block.FeedVO) // Start time -> feeds.
 	for _, feed := range feeds {

pkg/schedule/schedule.go

@@ -58,6 +58,7 @@ func (c *Config) From(app *config.App) *Config {
 			Query:         r.Query,
 			Threshold:     r.Threshold,
 			LabelFilters:  r.LabelFilters,
+			Labels:        r.Labels,
 			EveryDay:      r.EveryDay,
 			WatchInterval: time.Duration(r.WatchInterval),
 		}