Fixing file info caching issue with Aurora for master (#5477)

store/sql_file_info_store.go

@@ -143,7 +143,7 @@ func (s SqlFileInfoStore) InvalidateFileInfosForPostCache(postId string) {
 	fileInfoCache.Remove(postId)
 }
 
-func (fs SqlFileInfoStore) GetForPost(postId string, allowFromCache bool) StoreChannel {
+func (fs SqlFileInfoStore) GetForPost(postId string, readFromMaster bool, allowFromCache bool) StoreChannel {
 	storeChannel := make(StoreChannel, 1)
 
 	go func() {
@@ -174,7 +174,13 @@ func (fs SqlFileInfoStore) GetForPost(postId string, allowFromCache bool) StoreC
 
 		var infos []*model.FileInfo
 
-		if _, err := fs.GetReplica().Select(&infos,
+		dbmap := fs.GetReplica()
+
+		if readFromMaster {
+			dbmap = fs.GetMaster()
+		}
+
+		if _, err := dbmap.Select(&infos,
 			`SELECT
 				*
 			FROM
@@ -187,7 +193,10 @@ func (fs SqlFileInfoStore) GetForPost(postId string, allowFromCache bool) StoreC
 			result.Err = model.NewLocAppError("SqlFileInfoStore.GetForPost",
 				"store.sql_file_info.get_for_post.app_error", nil, "post_id="+postId+", "+err.Error())
 		} else {
-			fileInfoCache.AddWithExpiresInSecs(postId, infos, FILE_INFO_CACHE_SEC)
+			if len(infos) > 0 {
+				fileInfoCache.AddWithExpiresInSecs(postId, infos, FILE_INFO_CACHE_SEC)
+			}
+
 			result.Data = infos
 		}
 

store/sql_file_info_store_test.go

@@ -114,13 +114,19 @@ func TestFileInfoGetForPost(t *testing.T) {
 		infos[i] = Must(store.FileInfo().Save(info)).(*model.FileInfo)
 	}
 
-	if result := <-store.FileInfo().GetForPost(postId, false); result.Err != nil {
+	if result := <-store.FileInfo().GetForPost(postId, true, false); result.Err != nil {
 		t.Fatal(result.Err)
 	} else if returned := result.Data.([]*model.FileInfo); len(returned) != 2 {
 		t.Fatal("should've returned exactly 2 file infos")
 	}
 
-	if result := <-store.FileInfo().GetForPost(postId, true); result.Err != nil {
+	if result := <-store.FileInfo().GetForPost(postId, false, false); result.Err != nil {
+		t.Fatal(result.Err)
+	} else if returned := result.Data.([]*model.FileInfo); len(returned) != 2 {
+		t.Fatal("should've returned exactly 2 file infos")
+	}
+
+	if result := <-store.FileInfo().GetForPost(postId, true, true); result.Err != nil {
 		t.Fatal(result.Err)
 	} else if returned := result.Data.([]*model.FileInfo); len(returned) != 2 {
 		t.Fatal("should've returned exactly 2 file infos")
@@ -163,7 +169,7 @@ func TestFileInfoAttachToPost(t *testing.T) {
 		info2 = Must(store.FileInfo().Get(info2.Id)).(*model.FileInfo)
 	}
 
-	if result := <-store.FileInfo().GetForPost(postId, false); result.Err != nil {
+	if result := <-store.FileInfo().GetForPost(postId, true, false); result.Err != nil {
 		t.Fatal(result.Err)
 	} else if infos := result.Data.([]*model.FileInfo); len(infos) != 2 {
 		t.Fatal("should've returned exactly 2 file infos")
@@ -208,7 +214,7 @@ func TestFileInfoDeleteForPost(t *testing.T) {
 		t.Fatal(result.Err)
 	}
 
-	if infos := Must(store.FileInfo().GetForPost(postId, false)).([]*model.FileInfo); len(infos) != 0 {
+	if infos := Must(store.FileInfo().GetForPost(postId, true, false)).([]*model.FileInfo); len(infos) != 0 {
 		t.Fatal("shouldn't have returned any file infos")
 	}
 }

store/store.go

@@ -326,7 +326,7 @@ type FileInfoStore interface {
 	Save(info *model.FileInfo) StoreChannel
 	Get(id string) StoreChannel
 	GetByPath(path string) StoreChannel
-	GetForPost(postId string, allowFromCache bool) StoreChannel
+	GetForPost(postId string, readFromMaster bool, allowFromCache bool) StoreChannel
 	InvalidateFileInfosForPostCache(postId string)
 	AttachToPost(fileId string, postId string) StoreChannel
 	DeleteForPost(postId string) StoreChannel