Adding ability to fetch posts around a specifc post

2015-11-03 11:34:52 -05:00
--- a/api/post.go
+++ b/api/post.go
@@ -31,6 +31,8 @@ func InitPost(r *mux.Router) {
 	sr.Handle("/posts/{time:[0-9]+}", ApiUserRequiredActivity(getPostsSince, false)).Methods("GET")
 	sr.Handle("/post/{post_id:[A-Za-z0-9]+}", ApiUserRequired(getPost)).Methods("GET")
 	sr.Handle("/post/{post_id:[A-Za-z0-9]+}/delete", ApiUserRequired(deletePost)).Methods("POST")
+	sr.Handle("/post/{post_id:[A-Za-z0-9]+}/before/{offset:[0-9]+}/{num_posts:[0-9]+}", ApiUserRequired(getPostsBefore)).Methods("GET")
+	sr.Handle("/post/{post_id:[A-Za-z0-9]+}/after/{offset:[0-9]+}/{num_posts:[0-9]+}", ApiUserRequired(getPostsAfter)).Methods("GET")
 }

 func createPost(c *Context, w http.ResponseWriter, r *http.Request) {
@@ -812,6 +814,70 @@ func deletePost(c *Context, w http.ResponseWriter, r *http.Request) {
 	}
 }

+func getPostsBefore(c *Context, w http.ResponseWriter, r *http.Request) {
+	getPostsBeforeOrAfter(c, w, r, true)
+}
+func getPostsAfter(c *Context, w http.ResponseWriter, r *http.Request) {
+	getPostsBeforeOrAfter(c, w, r, false)
+}
+func getPostsBeforeOrAfter(c *Context, w http.ResponseWriter, r *http.Request, before bool) {
+	params := mux.Vars(r)
+
+	id := params["id"]
+	if len(id) != 26 {
+		c.SetInvalidParam("getPostsBeforeOrAfter", "channelId")
+		return
+	}
+
+	postId := params["post_id"]
+	if len(postId) != 26 {
+		c.SetInvalidParam("getPostsBeforeOrAfter", "postId")
+		return
+	}
+
+	numPosts, err := strconv.Atoi(params["num_posts"])
+	if err != nil || numPosts <= 0 {
+		c.SetInvalidParam("getPostsBeforeOrAfter", "numPosts")
+		return
+	}
+
+	offset, err := strconv.Atoi(params["offset"])
+	if err != nil || offset < 0 {
+		c.SetInvalidParam("getPostsBeforeOrAfter", "offset")
+		return
+	}
+
+	cchan := Srv.Store.Channel().CheckPermissionsTo(c.Session.TeamId, id, c.Session.UserId)
+	// We can do better than this etag in this situation
+	etagChan := Srv.Store.Post().GetEtag(id)
+
+	if !c.HasPermissionsToChannel(cchan, "getPostsBeforeOrAfter") {
+		return
+	}
+
+	etag := (<-etagChan).Data.(string)
+	if HandleEtag(etag, w, r) {
+		return
+	}
+
+	var pchan store.StoreChannel
+	if before {
+		pchan = Srv.Store.Post().GetPostsBefore(id, postId, numPosts, offset)
+	} else {
+		pchan = Srv.Store.Post().GetPostsAfter(id, postId, numPosts, offset)
+	}
+
+	if result := <-pchan; result.Err != nil {
+		c.Err = result.Err
+		return
+	} else {
+		list := result.Data.(*model.PostList)
+
+		w.Header().Set(model.HEADER_ETAG_SERVER, etag)
+		w.Write([]byte(list.ToJson()))
+	}
+}
+
 func searchPosts(c *Context, w http.ResponseWriter, r *http.Request) {
 	terms := r.FormValue("terms")

--- a/api/post_test.go
+++ b/api/post_test.go
@@ -329,6 +329,83 @@ func TestGetPostsSince(t *testing.T) {
 	}
 }

+func TestGetPostsBeforeAfter(t *testing.T) {
+	Setup()
+
+	team := &model.Team{DisplayName: "Name", Name: "z-z-" + model.NewId() + "a", Email: "test@nowhere.com", Type: model.TEAM_OPEN}
+	team = Client.Must(Client.CreateTeam(team)).Data.(*model.Team)
+
+	user1 := &model.User{TeamId: team.Id, Email: model.NewId() + "corey@test.com", Nickname: "Corey Hulen", Password: "pwd"}
+	user1 = Client.Must(Client.CreateUser(user1, "")).Data.(*model.User)
+	store.Must(Srv.Store.User().VerifyEmail(user1.Id))
+
+	Client.LoginByEmail(team.Name, user1.Email, "pwd")
+
+	channel1 := &model.Channel{DisplayName: "TestGetPosts", Name: "a" + model.NewId() + "a", Type: model.CHANNEL_OPEN, TeamId: team.Id}
+	channel1 = Client.Must(Client.CreateChannel(channel1)).Data.(*model.Channel)
+
+	time.Sleep(10 * time.Millisecond)
+	post0 := &model.Post{ChannelId: channel1.Id, Message: "a" + model.NewId() + "a"}
+	post0 = Client.Must(Client.CreatePost(post0)).Data.(*model.Post)
+
+	time.Sleep(10 * time.Millisecond)
+	post1 := &model.Post{ChannelId: channel1.Id, Message: "a" + model.NewId() + "a"}
+	post1 = Client.Must(Client.CreatePost(post1)).Data.(*model.Post)
+
+	time.Sleep(10 * time.Millisecond)
+	post1a1 := &model.Post{ChannelId: channel1.Id, Message: "a" + model.NewId() + "a", RootId: post1.Id}
+	post1a1 = Client.Must(Client.CreatePost(post1a1)).Data.(*model.Post)
+
+	time.Sleep(10 * time.Millisecond)
+	post2 := &model.Post{ChannelId: channel1.Id, Message: "a" + model.NewId() + "a"}
+	post2 = Client.Must(Client.CreatePost(post2)).Data.(*model.Post)
+
+	time.Sleep(10 * time.Millisecond)
+	post3 := &model.Post{ChannelId: channel1.Id, Message: "a" + model.NewId() + "a"}
+	post3 = Client.Must(Client.CreatePost(post3)).Data.(*model.Post)
+
+	time.Sleep(10 * time.Millisecond)
+	post3a1 := &model.Post{ChannelId: channel1.Id, Message: "a" + model.NewId() + "a", RootId: post3.Id}
+	post3a1 = Client.Must(Client.CreatePost(post3a1)).Data.(*model.Post)
+
+	r1 := Client.Must(Client.GetPostsBefore(channel1.Id, post1a1.Id, 0, 10, "")).Data.(*model.PostList)
+
+	if r1.Order[0] != post1.Id {
+		t.Fatal("wrong order")
+	}
+
+	if r1.Order[1] != post0.Id {
+		t.Fatal("wrong order")
+	}
+
+	if len(r1.Posts) != 2 {
+		t.Fatal("wrong size")
+	}
+
+	r2 := Client.Must(Client.GetPostsAfter(channel1.Id, post3a1.Id, 0, 3, "")).Data.(*model.PostList)
+
+	if len(r2.Posts) != 0 {
+		t.Fatal("should have been empty")
+	}
+
+	post2.Message = "new message"
+	Client.Must(Client.UpdatePost(post2))
+
+	r3 := Client.Must(Client.GetPostsAfter(channel1.Id, post1a1.Id, 0, 2, "")).Data.(*model.PostList)
+
+	if r3.Order[0] != post3.Id {
+		t.Fatal("wrong order")
+	}
+
+	if r3.Order[1] != post2.Id {
+		t.Fatal("wrong order")
+	}
+
+	if len(r3.Order) != 2 {
+		t.Fatal("missing post update")
+	}
+}
+
 func TestSearchPosts(t *testing.T) {
 	Setup()

--- a/model/client.go
+++ b/model/client.go
@@ -618,6 +618,24 @@ func (c *Client) GetPostsSince(channelId string, time int64) (*Result, *AppError
 	}
 }

+func (c *Client) GetPostsBefore(channelId string, postid string, offset int, limit int, etag string) (*Result, *AppError) {
+	if r, err := c.DoApiGet(fmt.Sprintf("/channels/%v/post/%v/before/%v/%v", channelId, postid, offset, limit), "", etag); err != nil {
+		return nil, err
+	} else {
+		return &Result{r.Header.Get(HEADER_REQUEST_ID),
+			r.Header.Get(HEADER_ETAG_SERVER), PostListFromJson(r.Body)}, nil
+	}
+}
+
+func (c *Client) GetPostsAfter(channelId string, postid string, offset int, limit int, etag string) (*Result, *AppError) {
+	if r, err := c.DoApiGet(fmt.Sprintf("/channels/%v/post/%v/after/%v/%v", channelId, postid, offset, limit), "", etag); err != nil {
+		return nil, err
+	} else {
+		return &Result{r.Header.Get(HEADER_REQUEST_ID),
+			r.Header.Get(HEADER_ETAG_SERVER), PostListFromJson(r.Body)}, nil
+	}
+}
+
 func (c *Client) GetPost(channelId string, postId string, etag string) (*Result, *AppError) {
 	if r, err := c.DoApiGet(fmt.Sprintf("/channels/%v/post/%v", channelId, postId), "", etag); err != nil {
 		return nil, err
--- a/store/sql_post_store.go
+++ b/store/sql_post_store.go
@@ -332,6 +332,104 @@ func (s SqlPostStore) GetPostsSince(channelId string, time int64) StoreChannel {
 	return storeChannel
 }

+func (s SqlPostStore) GetPostsBefore(channelId string, postId string, numPosts int, offset int) StoreChannel {
+	return s.getPostsAround(channelId, postId, numPosts, offset, true)
+}
+
+func (s SqlPostStore) GetPostsAfter(channelId string, postId string, numPosts int, offset int) StoreChannel {
+	return s.getPostsAround(channelId, postId, numPosts, offset, false)
+}
+
+func (s SqlPostStore) getPostsAround(channelId string, postId string, numPosts int, offset int, before bool) StoreChannel {
+	storeChannel := make(StoreChannel)
+
+	go func() {
+		result := StoreResult{}
+
+		var direction string
+		var sort string
+		if before {
+			direction = "<"
+			sort = "DESC"
+		} else {
+			direction = ">"
+			sort = "ASC"
+		}
+
+		var posts []*model.Post
+		var parents []*model.Post
+		_, err1 := s.GetReplica().Select(&posts,
+			`(SELECT
+			    *
+			FROM
+			    Posts
+			WHERE
+				(CreateAt `+direction+` (SELECT CreateAt FROM Posts WHERE Id = :PostId)
+			        AND ChannelId = :ChannelId
+					AND DeleteAt = 0)
+			ORDER BY CreateAt `+sort+`
+			LIMIT :NumPosts
+			OFFSET :Offset)`,
+			map[string]interface{}{"ChannelId": channelId, "PostId": postId, "NumPosts": numPosts, "Offset": offset})
+		_, err2 := s.GetReplica().Select(&parents,
+			`(SELECT
+			    *
+			FROM
+			    Posts
+			WHERE
+			    Id
+			IN
+			    (SELECT * FROM (SELECT
+			        RootId
+			    FROM
+			        Posts
+			    WHERE
+					(CreateAt `+direction+` (SELECT CreateAt FROM Posts WHERE Id = :PostId)
+						AND ChannelId = :ChannelId
+						AND DeleteAt = 0)
+					ORDER BY CreateAt `+sort+`
+					LIMIT :NumPosts
+					OFFSET :Offset)
+			    temp_tab))
+			ORDER BY CreateAt DESC`,
+			map[string]interface{}{"ChannelId": channelId, "PostId": postId, "NumPosts": numPosts, "Offset": offset})
+
+		if err1 != nil {
+			result.Err = model.NewAppError("SqlPostStore.GetPostContext", "We couldn't get the posts for the channel", "channelId="+channelId+err1.Error())
+		} else if err2 != nil {
+			result.Err = model.NewAppError("SqlPostStore.GetPostContext", "We couldn't get the parent posts for the channel", "channelId="+channelId+err2.Error())
+		} else {
+
+			list := &model.PostList{Order: make([]string, 0, len(posts))}
+
+			// We need to flip the order if we selected backwards
+			if before {
+				for _, p := range posts {
+					list.AddPost(p)
+					list.AddOrder(p.Id)
+				}
+			} else {
+				l := len(posts)
+				for i := range posts {
+					list.AddPost(posts[l-i-1])
+					list.AddOrder(posts[l-i-1].Id)
+				}
+			}
+
+			for _, p := range parents {
+				list.AddPost(p)
+			}
+
+			result.Data = list
+		}
+
+		storeChannel <- result
+		close(storeChannel)
+	}()
+
+	return storeChannel
+}
+
 func (s SqlPostStore) getRootPosts(channelId string, offset int, limit int) StoreChannel {
 	storeChannel := make(StoreChannel)

--- a/store/sql_post_store_test.go
+++ b/store/sql_post_store_test.go
@@ -383,6 +383,111 @@ func TestPostStoreGetPostsWtihDetails(t *testing.T) {
 	}
 }

+func TestPostStoreGetPostsBeforeAfter(t *testing.T) {
+	Setup()
+	o0 := &model.Post{}
+	o0.ChannelId = model.NewId()
+	o0.UserId = model.NewId()
+	o0.Message = "a" + model.NewId() + "b"
+	o0 = (<-store.Post().Save(o0)).Data.(*model.Post)
+	time.Sleep(2 * time.Millisecond)
+
+	o1 := &model.Post{}
+	o1.ChannelId = model.NewId()
+	o1.UserId = model.NewId()
+	o1.Message = "a" + model.NewId() + "b"
+	o1 = (<-store.Post().Save(o1)).Data.(*model.Post)
+	time.Sleep(2 * time.Millisecond)
+
+	o2 := &model.Post{}
+	o2.ChannelId = o1.ChannelId
+	o2.UserId = model.NewId()
+	o2.Message = "a" + model.NewId() + "b"
+	o2.ParentId = o1.Id
+	o2.RootId = o1.Id
+	o2 = (<-store.Post().Save(o2)).Data.(*model.Post)
+	time.Sleep(2 * time.Millisecond)
+
+	o2a := &model.Post{}
+	o2a.ChannelId = o1.ChannelId
+	o2a.UserId = model.NewId()
+	o2a.Message = "a" + model.NewId() + "b"
+	o2a.ParentId = o1.Id
+	o2a.RootId = o1.Id
+	o2a = (<-store.Post().Save(o2a)).Data.(*model.Post)
+	time.Sleep(2 * time.Millisecond)
+
+	o3 := &model.Post{}
+	o3.ChannelId = o1.ChannelId
+	o3.UserId = model.NewId()
+	o3.Message = "a" + model.NewId() + "b"
+	o3.ParentId = o1.Id
+	o3.RootId = o1.Id
+	o3 = (<-store.Post().Save(o3)).Data.(*model.Post)
+	time.Sleep(2 * time.Millisecond)
+
+	o4 := &model.Post{}
+	o4.ChannelId = o1.ChannelId
+	o4.UserId = model.NewId()
+	o4.Message = "a" + model.NewId() + "b"
+	o4 = (<-store.Post().Save(o4)).Data.(*model.Post)
+	time.Sleep(2 * time.Millisecond)
+
+	o5 := &model.Post{}
+	o5.ChannelId = o1.ChannelId
+	o5.UserId = model.NewId()
+	o5.Message = "a" + model.NewId() + "b"
+	o5.ParentId = o4.Id
+	o5.RootId = o4.Id
+	o5 = (<-store.Post().Save(o5)).Data.(*model.Post)
+
+	r1 := (<-store.Post().GetPostsBefore(o1.ChannelId, o1.Id, 4, 0)).Data.(*model.PostList)
+
+	if len(r1.Posts) != 0 {
+		t.Fatal("Wrong size")
+	}
+
+	r2 := (<-store.Post().GetPostsAfter(o1.ChannelId, o1.Id, 4, 0)).Data.(*model.PostList)
+
+	if r2.Order[0] != o4.Id {
+		t.Fatal("invalid order")
+	}
+
+	if r2.Order[1] != o3.Id {
+		t.Fatal("invalid order")
+	}
+
+	if r2.Order[2] != o2a.Id {
+		t.Fatal("invalid order")
+	}
+
+	if r2.Order[3] != o2.Id {
+		t.Fatal("invalid order")
+	}
+
+	if len(r2.Posts) != 5 {
+		t.Fatal("wrong size")
+	}
+
+	r3 := (<-store.Post().GetPostsBefore(o3.ChannelId, o3.Id, 2, 0)).Data.(*model.PostList)
+
+	if r3.Order[0] != o2a.Id {
+		t.Fatal("invalid order")
+	}
+
+	if r3.Order[1] != o2.Id {
+		t.Fatal("invalid order")
+	}
+
+	if len(r3.Posts) != 3 {
+		t.Fatal("wrong size")
+	}
+
+	if r3.Posts[o1.Id].Message != o1.Message {
+		t.Fatal("Missing parent")
+	}
+}
+
 func TestPostStoreGetPostsSince(t *testing.T) {
 	Setup()
 	o0 := &model.Post{}
--- a/store/store.go
+++ b/store/store.go
@@ -86,6 +86,8 @@ type PostStore interface {
 	Get(id string) StoreChannel
 	Delete(postId string, time int64) StoreChannel
 	GetPosts(channelId string, offset int, limit int) StoreChannel
+	GetPostsBefore(channelId string, postId string, numPosts int, offset int) StoreChannel
+	GetPostsAfter(channelId string, postId string, numPosts int, offset int) StoreChannel
 	GetPostsSince(channelId string, time int64) StoreChannel
 	GetEtag(channelId string) StoreChannel
 	Search(teamId string, userId string, params *model.SearchParams) StoreChannel