📚 Add a draft of collaborative edition protocol documentation.

backend/src/uxbox/fixtures.clj

@@ -79,7 +79,6 @@
              (create-additional-project-user conn [project-index user-index])))))
 
 
-
 ;; --- Create Page Files
 
 (def create-file-sql

docs/99-Collaborative-Edition.md

@@ -0,0 +1,123 @@
+# Collaborative Edition
+
+This is a collection of design notes for collaborative edition feature.
+
+## Persistence Ops
+
+This is a page data structure:
+
+```
+{:shapes [<id>, ...]
+ :canvas [<id>, ...]
+ :shapes-by-id {<id> <object>, ...}}
+```
+
+This is a potential list of persistent ops:
+
+```
+;; Generic (Shapes & Canvas)
+[:mod-shape <id> [:(mod|add|del) <attr> <val?>], ...] ;; Persistent
+
+;; Example:
+;; [:mod-shape 1 [:add :x 2] [:mod :y 3]]
+
+;; Specific
+[:add-shape <id> <object>]
+[:add-canvas <id> <object>]
+
+[:del-shape <id>]
+[:del-canvas <id>]
+
+[:mov-canvas <id> :after <id|null>] ;; null implies at first position
+[:mov-shape <id> :after <id|null>]
+```
+
+## Ephemeral communication (Websocket protocol)
+
+
+### `join` ###
+
+Sent by clients for notify joining a concrete page-id inside a file.
+
+```clojure
+{:type :join
+ :page-id <id>
+ :version <number>
+ }
+```
+
+Will cause:
+
+- A posible `:page-changes`.
+- Broadcast `:joined` message to all users of the file.
+
+
+### `who` ###
+
+Sent by clients for request the list of users in the channel.
+
+```clojure
+{:type :who}
+```
+
+Will cause:
+
+- Reply to the client with the current users list:
+
+```clojure
+{:type :who
+ :users #{<id>,...}}
+```
+
+This will be sent all the time user joins or leaves the channel for
+maintain the frontend updated with the lates participants. This
+message is also sent at the beggining of connection from server to
+client.
+
+
+### `pointer-update` ###
+
+This is sent by client to server and then, broadcasted to the rest of
+channel participants.
+
+```clojure
+{:type :pointer-update
+ :page-id <id>
+ :x <number>
+ :y <number>
+ }
+```
+
+The server broadcast message will look like:
+
+```clojure
+{:type :pointer-update
+ :user-id <id>
+ :page-id <id>
+ :x <number>
+ :y <number>
+ }
+```
+
+### `:page-snapshot` ###
+
+A message that server sends to client for notify page changes. It can be sent
+on `join` and when a page change is commited to the database.
+
+```clojure
+{:type :page-snapshot
+ :user-id <id>
+ :page-id <id>
+ :version <number>
+ :operations [<op>, ...]
+ }
+```
+
+This message is only sent to users that does not perform this change.
+
+
+
+
+
+
+