🚧 Initial work on ops based page data updates.

backend/resources/migrations/0003.projects.sql

@@ -68,7 +68,7 @@ CREATE TABLE IF NOT EXISTS project_pages (
   metadata bytea NULL DEFAULT NULL
 );
 
-CREATE TABLE IF NOT EXISTS project_page_history (
+CREATE TABLE IF NOT EXISTS project_page_snapshots (
   id uuid PRIMARY KEY DEFAULT uuid_generate_v4(),
 
   user_id uuid NULL REFERENCES users(id) ON DELETE SET NULL,
@@ -81,7 +81,8 @@ CREATE TABLE IF NOT EXISTS project_page_history (
   pinned bool NOT NULL DEFAULT false,
   label text NOT NULL DEFAULT '',
 
-  data bytea NOT NULL
+  data bytea NOT NULL,
+  operations bytea NULL DEFAULT NULL
 );
 
 -- Indexes
@@ -94,8 +95,8 @@ CREATE INDEX project_files__project_id__idx ON project_files(project_id);
 CREATE INDEX project_pages__user_id__idx ON project_pages(user_id);
 CREATE INDEX project_pages__file_id__idx ON project_pages(file_id);
 
-CREATE INDEX project_page_history__page_id__idx ON project_page_history(page_id);
-CREATE INDEX project_page_history__user_id__idx ON project_page_history(user_id);
+CREATE INDEX project_page_snapshots__page_id__idx ON project_page_snapshots(page_id);
+CREATE INDEX project_page_snapshots__user_id__idx ON project_page_snapshots(user_id);
 
 -- Triggers
 
@@ -152,6 +153,6 @@ CREATE TRIGGER project_pages__modified_at__tgr
 BEFORE UPDATE ON project_pages
    FOR EACH ROW EXECUTE PROCEDURE update_modified_at();
 
-CREATE TRIGGER project_page_history__modified_at__tgr
-BEFORE UPDATE ON project_page_history
+CREATE TRIGGER project_page_snapshots__modified_at__tgr
+BEFORE UPDATE ON project_page_snapshots
    FOR EACH ROW EXECUTE PROCEDURE update_modified_at();

backend/src/uxbox/services/mutations/project_pages.clj

@@ -56,11 +56,11 @@
     (-> (db/query-one conn [sql id user file-id name ordering data mdata])
         (p/then' decode-row))))
 
-;; --- Mutation: Update Page
+;; --- Mutation: Update Page Data
 
 (declare select-page-for-update)
-(declare update-page)
-(declare update-history)
+(declare update-page-data)
+(declare insert-page-snapshot)
 
 (s/def ::update-project-page-data
   (s/keys :req-un [::id ::user ::data]))
@@ -73,13 +73,13 @@
       (let [data (blob/encode data)
             version (inc version)
             params (assoc params :id id :data data :version version)]
-        (p/do! (update-page conn params)
-               (update-history conn params)
+        (p/do! (update-page-data conn params)
+               (insert-page-snapshot conn params)
                (select-keys params [:id :version]))))))
 
 (defn- select-page-for-update
   [conn id]
-  (let [sql "select p.id, p.version, p.file_id
+  (let [sql "select p.id, p.version, p.file_id, p.data
                from project_pages as p
               where p.id = $1
                 and deleted_at is null
@@ -87,8 +87,8 @@
     (-> (db/query-one conn [sql id])
         (p/then' su/raise-not-found-if-nil))))
 
-(defn- update-page
-  [conn {:keys [id name version data metadata]}]
+(defn- update-page-data
+  [conn {:keys [id name version data]}]
   (let [sql "update project_pages
                 set version = $1,
                     data = $2
@@ -96,12 +96,12 @@
     (-> (db/query-one conn [sql version data id])
         (p/then' su/constantly-nil))))
 
-(defn- update-history
-  [conn {:keys [user id version data]}]
-  (let [sql "insert into project_page_history (user_id, page_id, version, data)
-             values ($1, $2, $3, $4)"]
-    (-> (db/query-one conn [sql user id version data])
-        (p/then' su/constantly-nil))))
+(defn- insert-page-snapshot
+  [conn {:keys [user id version data operations]}]
+  (let [sql "insert into project_page_snapshots (user_id, page_id, version, data, operations)
+             values ($1, $2, $3, $4, $5)
+             returning id, version, operations"]
+    (db/query-one conn [sql user id version data operations])))
 
 ;; --- Mutation: Rename Page
 
@@ -126,23 +126,60 @@
     (-> (db/query-one db/pool [sql id name])
         (p/then su/constantly-nil))))
 
-;; --- Mutation: Update Page Metadata
+;; --- Mutation: Update Page
 
-;; (s/def ::update-page-metadata
-;;   (s/keys :req-un [::user ::project-id ::name ::metadata ::id]))
+;; A generic, Ops based (granular) page update method.
 
-;; (sm/defmutation ::update-page-metadata
-;;   [{:keys [id user project-id name metadata]}]
-;;   (let [sql "update pages
-;;                 set name = $3,
-;;                     metadata = $4
-;;               where id = $1
-;;                 and user_id = $2
-;;                 and deleted_at is null
-;;              returning *"
-;;         mdata (blob/encode metadata)]
-;;     (-> (db/query-one db/pool [sql id user name mdata])
-;;         (p/then' decode-row))))
+(s/def ::operations
+  (s/coll-of ::cp/opeation :kind vector?))
+
+(s/def ::update-project-page
+  (s/keys :opt-un [::id ::user ::version ::operations]))
+
+(declare update-project-page)
+(declare retrieve-lagged-operations)
+
+(sm/defmutation ::update-project-page
+  [{:keys [id user] :as params}]
+  (db/with-atomic [conn db/pool]
+    (p/let [{:keys [file-id] :as page} (select-page-for-update conn id)]
+      (files/check-edition-permissions! conn user file-id)
+      (update-project-page conn page params))))
+
+(defn- update-project-page
+  [conn page params]
+  (when (> (:version page)
+           (:version params))
+    (ex/raise :type :validation
+              :code :version-conflict
+              :hint "The incoming version is greater that stored version."
+              :context {:incoming-version (:version params)
+                        :stored-version (:version page)}))
+  (let [ops  (:operations params)
+        data (-> (:data page)
+                 (blob/decode)
+                 (cp/process-ops ops)
+                 (blob/encode))
+        page (assoc page
+                    :data data
+                    :version (inc (:version page))
+                    :operations (blob/encode ops))]
+    (-> (update-page-data conn page)
+        (p/then (fn [_] (insert-page-snapshot conn page)))
+        (p/then (fn [s] (retrieve-lagged-operations conn s params))))))
+
+(su/defstr sql:lagged-snapshots
+  "select s.id, s.version, s.operations,
+          s.created_at, s.modified_at, s.user_id
+     from project_page_snapshots as s
+    where s.page_id = $1
+      and s.version > $2")
+
+(defn- retrieve-lagged-operations
+  [conn snapshot params]
+  (let [sql sql:lagged-snapshots]
+    (-> (db/query conn [sql (:id params) (:version params)])
+        (p/then (partial mapv decode-row)))))
 
 ;; --- Mutation: Delete Page
 
@@ -158,12 +195,15 @@
       (files/check-edition-permissions! conn user (:file-id page))
       (delete-page conn id))))
 
+(su/defstr sql:delete-page
+  "update project_pages
+      set deleted_at = clock_timestamp()
+    where id = $1
+      and deleted_at is null")
+
 (defn- delete-page
   [conn id]
-  (let [sql "update project_pages
-                set deleted_at = clock_timestamp()
-              where id = $1
-                and deleted_at is null"]
+  (let [sql sql:delete-page]
     (-> (db/query-one conn [sql id])
         (p/then su/constantly-nil))))
 
@@ -178,7 +218,7 @@
 ;;     (some-> (db/fetch-one conn sqlv)
 ;;             (decode-row))))
 
-;; (s/def ::label ::us/string)
+;; (s/def ::label ::cs/string)
 ;; (s/def ::update-page-history
 ;;   (s/keys :req-un [::user ::id ::pinned ::label]))
 

backend/src/uxbox/services/queries/project_pages.clj

@@ -139,8 +139,9 @@
 ;; --- Helpers
 
 (defn decode-row
-  [{:keys [data metadata] :as row}]
+  [{:keys [data metadata operations] :as row}]
   (when row
     (cond-> row
       data (assoc :data (blob/decode data))
-      metadata (assoc :metadata (blob/decode metadata)))))
+      metadata (assoc :metadata (blob/decode metadata))
+      operations (assoc :operations (blob/decode operations)))))

backend/test/uxbox/tests/test_services_project_pages.clj

@@ -7,6 +7,7 @@
    [uxbox.http :as http]
    [uxbox.services.mutations :as sm]
    [uxbox.services.queries :as sq]
+   [uxbox.util.uuid :as uuid]
    [uxbox.tests.helpers :as th]))
 
 (t/use-fixtures :once th/state-init)
@@ -34,7 +35,9 @@
         pf   @(th/create-project-file db/pool (:id user) (:id proj) 1)
 
         data {::sm/type :create-project-page
-              :data {}
+              :data {:canvas []
+                     :shapes []
+                     :shapes-by-id {}}
               :metadata {}
               :file-id (:id pf)
               :ordering 1
@@ -57,7 +60,9 @@
         page @(th/create-project-page db/pool (:id user) (:id file) 1)
         data {::sm/type :update-project-page-data
               :id (:id page)
-              :data {:shapes [1 2 3]}
+              :data {:shapes [(uuid/next)]
+                     :canvas []
+                     :shapes-by-id {}}
               :file-id (:id file)
               :user (:id user)}
         out (th/try-on! (sm/handle data))]

frontend/src/uxbox/main/data/pages.cljs

@@ -82,6 +82,9 @@
   "A marker protocol for mark events that alters the
   page and is subject to perform a backend synchronization.")
 
+(defprotocol IPageOps
+  (-ops [_] "Get a list of ops for the event."))
+
 (defn page-update?
   [o]
   (or (satisfies? IPageDataUpdate o)