From 196d66f2211cacf43053bfaeba4bd59bc26b59e8 Mon Sep 17 00:00:00 2001
From: Ken Hibino <ken.hibino7@gmail.com>
Date: Sat, 26 Dec 2020 14:35:25 -0800
Subject: [PATCH] Fix ListSchedulerEnqueueEvents to list recent events first

---
 internal/rdb/inspect.go      |  2 +-
 internal/rdb/inspect_test.go | 37 ++++++++++++++++++++----------------
 tools/asynq/cmd/cron.go      |  6 ------
 3 files changed, 22 insertions(+), 23 deletions(-)

diff --git a/internal/rdb/inspect.go b/internal/rdb/inspect.go
index d5933cb..df6a0aa 100644
--- a/internal/rdb/inspect.go
+++ b/internal/rdb/inspect.go
@@ -855,7 +855,7 @@ func (r *RDB) ListSchedulerEntries() ([]*base.SchedulerEntry, error) {
 // ListSchedulerEnqueueEvents returns the list of scheduler enqueue events.
 func (r *RDB) ListSchedulerEnqueueEvents(entryID string, pgn Pagination) ([]*base.SchedulerEnqueueEvent, error) {
 	key := base.SchedulerHistoryKey(entryID)
-	zs, err := r.client.ZRangeWithScores(key, pgn.start(), pgn.stop()).Result()
+	zs, err := r.client.ZRevRangeWithScores(key, pgn.start(), pgn.stop()).Result()
 	if err != nil {
 		return nil, err
 	}
diff --git a/internal/rdb/inspect_test.go b/internal/rdb/inspect_test.go
index fe831c4..c274c8d 100644
--- a/internal/rdb/inspect_test.go
+++ b/internal/rdb/inspect_test.go
@@ -3033,9 +3033,10 @@ func TestSchedulerEnqueueEvents(t *testing.T) {
 	r := setup(t)
 
 	var (
-		now        = time.Now()
-		oneDayAgo  = now.Add(-24 * time.Hour)
-		oneHourAgo = now.Add(-1 * time.Hour)
+		now          = time.Now()
+		oneDayAgo    = now.Add(-24 * time.Hour)
+		fiveHoursAgo = now.Add(-5 * time.Hour)
+		oneHourAgo   = now.Add(-1 * time.Hour)
 	)
 
 	type event struct {
@@ -3047,22 +3048,26 @@ func TestSchedulerEnqueueEvents(t *testing.T) {
 	tests := []struct {
 		entryID string
 		events  []*base.SchedulerEnqueueEvent
+		want    []*base.SchedulerEnqueueEvent
 	}{
 		{
 			entryID: "entry123",
-			events: []*base.SchedulerEnqueueEvent{
-				{
-					TaskID:     "task123",
-					EnqueuedAt: oneDayAgo,
-				}, {
-					TaskID:     "task456",
-					EnqueuedAt: oneHourAgo,
-				},
+			events:  []*base.SchedulerEnqueueEvent{
+				{TaskID: "task123", EnqueuedAt:  oneDayAgo},
+				{TaskID: "task789", EnqueuedAt:  oneHourAgo},
+				{TaskID: "task456", EnqueuedAt: fiveHoursAgo},
+			},
+			// Recent events first
+			want: []*base.SchedulerEnqueueEvent{
+				{TaskID: "task789", EnqueuedAt: oneHourAgo},
+				{TaskID: "task456", EnqueuedAt: fiveHoursAgo},
+				{TaskID: "task123", EnqueuedAt: oneDayAgo},
 			},
 		},
 		{
-			entryID: "entry123",
-			events:  []*base.SchedulerEnqueueEvent{},
+			entryID: "entry456",
+			events:  nil,
+			want:    nil,
 		},
 	}
 
@@ -3076,14 +3081,14 @@ loop:
 				continue loop
 			}
 		}
-		got, err := r.ListSchedulerEnqueueEvents(tc.entryID)
+		got, err := r.ListSchedulerEnqueueEvents(tc.entryID, Pagination{Size: 20, Page: 0})
 		if err != nil {
 			t.Errorf("ListSchedulerEnqueueEvents(%q) failed: %v", tc.entryID, err)
 			continue
 		}
-		if diff := cmp.Diff(tc.events, got, h.SortSchedulerEnqueueEventOpt, timeCmpOpt); diff != "" {
+		if diff := cmp.Diff(tc.want, got, timeCmpOpt); diff != "" {
 			t.Errorf("ListSchedulerEnqueueEvent(%q) = %v, want %v; (-want,+got)\n%s",
-				tc.entryID, got, tc.events, diff)
+				tc.entryID, got, tc.want, diff)
 		}
 	}
 }
diff --git a/tools/asynq/cmd/cron.go b/tools/asynq/cmd/cron.go
index 23a61db..a7cffd1 100644
--- a/tools/asynq/cmd/cron.go
+++ b/tools/asynq/cmd/cron.go
@@ -118,12 +118,6 @@ func cronHistory(cmd *cobra.Command, args []string) {
 			continue
 		}
 
-		// Sort entries by enqueuedAt timestamp.
-		sort.Slice(events, func(i, j int) bool {
-			x, y := events[i], events[j]
-			return x.EnqueuedAt.Unix() > y.EnqueuedAt.Unix()
-		})
-
 		cols := []string{"TaskID", "EnqueuedAt"}
 		printRows := func(w io.Writer, tmpl string) {
 			for _, e := range events {