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+;;; rudel-obby-client.el --- Client functions of the Rudel obby backend
+;;
+;; Copyright (C) 2008, 2009 Jan Moringen
+;;
+;; Author: Jan Moringen <scymtym@users.sourceforge.net>
+;; Keywords: Rudel, obby, backend, client
+;; X-RCS: $Id:$
+;;
+;; This file is part of Rudel.
+;;
+;; Rudel is free software: you can redistribute it and/or modify it
+;; under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+;;
+;; Rudel is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+;; General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with Rudel. If not, see <http://www.gnu.org/licenses>.
+
+
+;;; Commentary:
+;;
+;; This file contains the client part of the obby backend.
+
+
+;;; History:
+;;
+;; 0.2 - State machine.
+;;
+;; 0.1 - Initial revision.
+
+
+;;; Code:
+;;
+
+(require 'eieio)
+
+(require 'jupiter)
+
+(require 'rudel-state-machine)
+(require 'rudel-operations)
+(require 'rudel-chat)
+
+(require 'rudel-obby-errors)
+(require 'rudel-obby-util)
+(require 'rudel-obby-state)
+
+
+;;; Class rudel-obby-client-state-new
+;;
+
+(defclass rudel-obby-client-state-new
+ (rudel-obby-client-connection-state)
+ ()
+ "Start state of newly established connections.")
+
+(defmethod rudel-obby/obby_welcome
+ ((this rudel-obby-client-state-new) version)
+ "Handle obby 'welcome' message."
+ ;; Examine announced protocol version.
+ (with-parsed-arguments ((version number))
+ (message "Received Obby welcome message (version %d)" version))
+ ;; Start encryption handshake
+ 'encryption-negotiate)
+
+
+;;; Class rudel-obby-client-state-encryption-negotiate
+;;
+
+(defclass rudel-obby-client-state-encryption-negotiate
+ (rudel-obby-client-connection-state)
+ ()
+ "Start state of the encryption handshake.")
+
+(defmethod rudel-obby/net6_encryption
+ ((this rudel-obby-client-state-encryption-negotiate) value)
+ "Handle net6 'encryption' message."
+ (rudel-send this "net6_encryption_ok")
+ 'encryption-start)
+
+
+;;; Class rudel-obby-client-connection-encryption-start
+;;
+
+(defclass rudel-obby-client-state-encryption-start
+ (rudel-obby-client-connection-state)
+ ()
+ "Second state of the encryption handshake.")
+
+(defmethod rudel-obby/net6_encryption_begin
+ ((this rudel-obby-client-state-encryption-start))
+ "Handle net6 'encryption_begin' message."
+ ;; Start TLS encryption for the connection.
+ (with-slots (connection) this
+ (with-slots (socket) connection
+ (when (rudel-process-object socket :supports-tls)
+ (rudel-tls-start-tls socket)
+ (sit-for 1))))
+
+ ;; The connection is now established
+ 'joining)
+
+(defmethod rudel-obby/net6_encryption_failed
+ ((this rudel-obby-client-state-encryption-start))
+ "Handle net6 'encryption_failed' message."
+ ;; The connection is now established; without encryption though
+ 'joining)
+
+
+;;; Class rudel-obby-client-state-joining
+;;
+
+(defclass rudel-obby-client-state-joining
+ (rudel-obby-client-connection-state)
+ ()
+ "First state after the connection has been properly set up.")
+
+(defmethod rudel-enter ((this rudel-obby-client-state-joining))
+ "When entering this state, send a login request."
+ ;; Send login request with username and color. This can easily fail
+ ;; (resulting in response 'net6_login_failed') if the username or
+ ;; color is already taken.
+ (with-slots (info) (oref this connection)
+ (let ((username (plist-get info :username))
+ (color (plist-get info :color))
+ (global-password (plist-get info :global-password))
+ (user-password (plist-get info :user-password)))
+ (apply #'rudel-send
+ this
+ "net6_client_login"
+ username (rudel-obby-format-color color)
+ (append (when global-password
+ (list global-password))
+ (when (and global-password user-password)
+ (list user-password))))))
+ nil)
+
+(defmethod rudel-obby/obby_sync_init
+ ((this rudel-obby-client-state-joining) count)
+ "Handle obby 'sync_init' message."
+ ;; Switch to 'synching' state, passing the number of synchronization
+ ;; items.
+ (with-parsed-arguments ((count number))
+ (list 'session-synching count)))
+
+(defmethod rudel-obby/net6_login_failed
+ ((this rudel-obby-client-state-joining) reason)
+ "Handle net6 'login_failed' message."
+ (with-parsed-arguments ((reason number))
+ (with-slots (connection) this
+ (let ((error-data
+ (cond
+ ;; Invalid username
+ ((= reason rudel-obby-error-username-invalid)
+ (cons 'rudel-obby-username-invalid nil))
+ ;; Username in use
+ ((= reason rudel-obby-error-username-in-use)
+ (cons 'rudel-obby-username-in-use nil))
+ ;; Color in use
+ ((= reason rudel-obby-error-color-in-use)
+ (cons 'rudel-obby-color-in-use nil))
+ ;; Wrong global password
+ ((= reason rudel-obby-error-wrong-global-password)
+ (cons 'rudel-obby-wrong-global-password nil))
+ ;; Wrong user password
+ ((= reason rudel-obby-error-wrong-user-password)
+ (cons 'rudel-obby-wrong-user-password nil))
+ ;; Otherwise, signal a generic join error
+ (t (cons 'rudel-join-error nil)))))
+
+ ;; Switch to 'join-failed' state, pass the error data.
+ (list 'join-failed error-data))))
+ )
+
+
+;;; Class rudel-obby-client-state-join-failed
+;;
+
+(defclass rudel-obby-client-state-join-failed
+ (rudel-obby-client-connection-state)
+ ((error-symbol :initarg :error-symbol
+ :type symbol
+ :documentation
+ "Error symbol describing the reason for the
+login failure.")
+ (error-data :initarg :error-data
+ :type list
+ :documentation
+ "Additional error data describing the login
+failure."))
+ "State for failed login attempts.")
+
+(defmethod rudel-enter ((this rudel-obby-client-state-join-failed)
+ error)
+ "When the state is entered, store the error data passed in ERROR."
+ (with-slots (error-symbol error-data) this
+ (setq error-symbol (car error)
+ error-data (cdr error)))
+ nil)
+
+
+;;; Class rudel-obby-client-state idle
+;;
+
+(defclass rudel-obby-client-state-idle
+ (rudel-obby-client-connection-state
+ rudel-obby-document-handler)
+ ()
+ "Default state of the connection.")
+
+(defmethod rudel-obby/net6_client_join
+ ((this rudel-obby-client-state-idle)
+ client-id name encryption user-id color)
+ "Handle net6 'client_join' message."
+ (with-parsed-arguments ((client-id number)
+ (user-id number)
+ (color color))
+ (with-slots (connection) this
+ (with-slots (session) connection
+ (let ((user (rudel-find-user session user-id
+ #'eq #'rudel-id)))
+ (if user
+ ;; If we have such a user object, update its state.
+ (with-slots ((client-id1 client-id)
+ (color1 color)
+ connected
+ (encryption1 encryption)) user
+ (setq client-id1 client-id
+ color1 color
+ connected t
+ encryption1 (string= encryption "1"))
+
+ ;; Run the change hook of the user object.
+ (object-run-hook-with-args user 'change-hook))
+ ;; Otherwise, create a new user object.
+ (let ((user (rudel-obby-user
+ name
+ :client-id client-id
+ :user-id user-id
+ :connected t
+ :encryption (string= encryption "1")
+ :color color)))
+ (rudel-add-user session user))))))
+ (message "Client joined: %s %s" name color))
+ nil)
+
+(defmethod rudel-obby/net6_client_part
+ ((this rudel-obby-client-state-idle) client-id)
+ "Handle net6 'client_part' message."
+ ;; Find the user object, associated to the client id. Remove the
+ ;; client id and change the user's state to disconnected.
+ (with-parsed-arguments ((client-id number))
+ (with-slots (connection) this
+ (with-slots (session) connection
+ (let ((user (rudel-find-user session client-id
+ #'eql #'rudel-client-id)))
+ (if user
+ (with-slots (client-id connected) user
+ ;; Set slot values.
+ (setq client-id nil
+ connected nil)
+
+ ;; Run the change hook of the user object.
+ (object-run-hook-with-args user 'change-hook))
+ (display-warning
+ '(rudel obby)
+ (format "Cannot find user for client id: %d"
+ client-id)
+ :warning))))))
+ nil)
+
+(defmethod rudel-obby/obby_user_colour
+ ((this rudel-obby-client-state-idle) user-id color)
+ "Handle obby 'user_colour' message."
+ (with-parsed-arguments ((user-id number)
+ (color color))
+ ;; Find user object and set color.
+ (with-slots (connection) this
+ (with-slots (session) connection
+ (let ((user (rudel-find-user session user-id
+ #'= #'rudel-id)))
+ (with-slots ((name :object-name) (color1 :color)) user
+ ;; Set color in user object.
+ (setq color1 color)
+
+ ;; Run the change hook of the user object.
+ (object-run-hook-with-args user 'change-hook)
+
+ ;; Update overlays.
+ (rudel-overlay-set-face-attributes
+ (rudel-overlay-make-face-symbol 'author name)
+ color1))))))
+ nil)
+
+(defmethod rudel-obby/obby_document_create
+ ((this rudel-obby-client-state-idle)
+ owner-id doc-id name suffix encoding)
+ "Handle obby 'document_create' message."
+ (with-parsed-arguments ((owner-id number)
+ (doc-id number)
+ (suffix number)
+ (encoding coding-system))
+ (with-slots (connection) this
+ (with-slots (session) connection
+ (let ((owner (rudel-find-user session owner-id
+ #'= #'rudel-id)))
+ (rudel-add-document session (rudel-obby-document
+ name
+ :subscribed (list owner)
+ :id doc-id
+ :owner-id owner-id
+ :suffix suffix))))
+ (message "New document: %s" name)))
+ nil)
+
+(defmethod rudel-obby/obby_document_remove
+ ((this rudel-obby-client-state-idle) doc-id)
+ "Handle obby 'document_remove' message."
+ (with-parsed-arguments ((doc-id document-id))
+ (with-slots (connection) this
+ (with-slots (session) connection
+ (let ((document (rudel-find-document
+ session doc-id
+ #'equal #'rudel-both-ids)))
+ (if document
+ (progn
+ (rudel-remove-document session document)
+ (with-slots ((name :object-name)) document
+ (message "Document removed: %s" name)))
+ (display-warning
+ '(rudel obby)
+ (format "Document not found: %s" doc-id)
+ :warning))))))
+ nil)
+
+(defmethod rudel-obby/obby_document/rename
+ ((this rudel-obby-client-state-idle)
+ document user new-name new-suffix)
+ "Handle obby 'rename' submessage of the 'obby_document' message."
+ (with-parsed-arguments ((new-suffix number))
+ (with-slots ((name :object-name) suffix) document
+ (setq name new-name
+ suffix new-suffix)))
+ nil)
+
+(defmethod rudel-obby/obby_document/subscribe
+ ((this rudel-obby-client-state-idle)
+ document user-id)
+ "Handle 'subscribe' submessage of obby 'document' message."
+ (with-parsed-arguments ((user-id number))
+ (with-slots (connection) this
+ (with-slots (session) connection
+ (let ((user (rudel-find-user session user-id
+ #'= #'rudel-id)))
+ (rudel-add-user document user)))))
+ nil)
+
+(defmethod rudel-obby/obby_document/unsubscribe
+ ((this rudel-obby-client-state-idle)
+ document user-id)
+ "Handle 'unsubscribe' submessage of obby 'document' message."
+ (with-parsed-arguments ((user-id number))
+ (with-slots (connection) this
+ (with-slots (session) connection
+ (let ((user (rudel-find-user session user-id
+ #'= #'rudel-id)))
+ (rudel-remove-user document user)))))
+ nil)
+
+(defmethod rudel-obby/obby_document/record
+ ((this rudel-obby-client-state-idle)
+ document user-id local-revision remote-revision
+ action &rest arguments)
+ "Handle 'record' submessage of obby 'document' message."
+ (with-parsed-arguments ((user-id number)
+ (local-revision number)
+ (remote-revision number))
+ ;; Locate the user.
+ (let ((user (with-slots (connection) this
+ (with-slots (session) connection
+ (rudel-find-user session user-id
+ #'= #'rudel-id)))))
+ (if user
+ (condition-case error
+ ;; Try to dispatch
+ (rudel-dispatch
+ this "rudel-obby/obby_document/record/" action
+ (append (list document user local-revision remote-revision)
+ arguments))
+ ;; Warn if we failed to locate or execute the
+ ;; method. Return nil in this case, so we remain in the
+ ;; current state.
+ (rudel-dispatch-error
+ (progn
+ (display-warning
+ '(rudel obby)
+ (format "%s: no method (%s: %s): `%s:%s'; arguments: %s"
+ (object-print this) (car error) (cdr error)
+ "rudel-obby/obby_document/record/" action arguments)
+ :debug)
+ nil)))
+ ;; If we did not find the user, warn.
+ (progn
+ (display-warning
+ '(rudel obby)
+ (format "User not found: %d" user-id)
+ :warning)
+ nil))))
+ )
+
+(defmethod rudel-obby/obby_document/record/ins
+ ((this rudel-obby-client-state-idle)
+ document user local-revision remote-revision
+ position data)
+ "Handle 'ins' submessage of 'record' submessage of obby 'document' message."
+ (with-parsed-arguments ((position number))
+ (let ((operation (jupiter-insert
+ (format "insert-%d-%d"
+ remote-revision local-revision)
+ :from position
+ :data data)))
+ (with-slots (connection) this
+ (rudel-remote-operation connection
+ document user
+ remote-revision local-revision
+ operation))))
+ nil)
+
+(defmethod rudel-obby/obby_document/record/del
+ ((this rudel-obby-client-state-idle)
+ document user local-revision remote-revision
+ position length)
+ "Handle 'del' submessage of 'record' submessage of obby 'document' message."
+ (with-parsed-arguments ((position number)
+ (length number))
+ (let ((operation (jupiter-delete
+ (format "delete-%d-%d"
+ remote-revision local-revision)
+ :from position
+ :to (+ position length))))
+ (with-slots (connection) this
+ (rudel-remote-operation connection
+ document user
+ remote-revision local-revision
+ operation))))
+ nil)
+
+(defmethod rudel-obby/obby_document/record/split
+ ((this rudel-obby-client-state-idle)
+ document user local-revision remote-revision
+ &rest operations)
+ "Handle 'split' submessage of 'record' submessage of obby 'document' message."
+ (let ((operation (rudel-message->operation
+ (cons "split" operations)
+ local-revision remote-revision)))
+ (with-slots (connection) this
+ (rudel-remote-operation connection
+ document user
+ remote-revision local-revision
+ operation)))
+ nil)
+
+(defmethod rudel-obby/obby_document/record/noop
+ ((this rudel-obby-client-state-idle)
+ document user local-revision remote-revision)
+ "Handle 'noop' submessage of 'record' submessage of obby 'document' message."
+ (let ((operation (jupiter-nop
+ (format "nop-%d-%d"
+ remote-revision local-revision))))
+ (with-slots (connection) this
+ (rudel-remote-operation connection
+ document user
+ remote-revision local-revision
+ operation)))
+ nil)
+
+(defmethod rudel-obby/obby_message ((this rudel-obby-client-state-idle)
+ sender text)
+ "Handle obby 'message' message"
+ (with-parsed-arguments ((sender number))
+ (with-slots (session) (oref this :connection)
+ (let ((sender (rudel-find-user session sender #'eq #'rudel-id)))
+ (rudel-chat-dispatch-message sender text))))
+ nil)
+
+
+;;; Class rudel-obby-client-state-session-synching
+;;
+
+(defclass rudel-obby-client-state-session-synching
+ (rudel-obby-client-connection-state)
+ ((all-items :initarg :all-items
+ :type (integer 0)
+ :documentation
+ "Total number of synchronization items expected
+ to receive from the server.")
+ (remaining-items :initarg :remaining-items
+ :type (integer 0)
+ :documentation
+ "Number of synchronization items not yet
+ received from the server.")
+ (have-self :initarg :have-self
+ :type boolean
+ :documentation
+ "Flag that remembers, whether the session has
+ a 'self' user object."))
+ "State used for synching session data.")
+
+(defmethod rudel-enter ((this rudel-obby-client-state-session-synching)
+ num-items)
+ "When entering state, store number of expected items."
+ (with-slots (all-items remaining-items have-self) this
+ (setq all-items num-items
+ remaining-items num-items
+ have-self nil))
+ nil)
+
+(defmethod rudel-obby/net6_client_join
+ ((this rudel-obby-client-state-session-synching)
+ client-id name encryption user-id color)
+ "Handle net6 'client_join' message."
+ (with-parsed-arguments ((client-id number)
+ (user-id number)
+ (color color))
+ (with-slots (connection remaining-items have-self) this
+ (with-slots (session) connection
+ ;; Construct user object and add it to the session.
+ (let ((user (rudel-obby-user
+ name
+ :client-id client-id
+ :user-id user-id
+ :connected t
+ :encryption (string= encryption "1")
+ :color color)))
+ (rudel-add-user session user)
+
+ ;; The first user object describes the user of this client.
+ (unless have-self
+ (with-slots (self) session
+ (setq self user
+ have-self t)))))
+
+ ;; Decrease number of not yet received synchronization items.
+ (decf remaining-items)))
+ nil)
+
+(defmethod rudel-obby/obby_sync_usertable_user
+ ((this rudel-obby-client-state-session-synching) user-id name color)
+ "Handle obby 'sync_usertable_user' message."
+ (with-parsed-arguments ((user-id number)
+ (color color))
+ (with-slots (connection remaining-items) this
+ (with-slots (session) connection
+ (rudel-add-user session (rudel-obby-user
+ name
+ :user-id user-id
+ :connected nil
+ :color color)))
+
+ ;; Decrease number of not yet received synchronization items.
+ (decf remaining-items)))
+ nil)
+
+(defmethod rudel-obby/obby_sync_doclist_document
+ ((this rudel-obby-client-state-session-synching)
+ owner-id doc-id name suffix encoding &rest subscribed-user-ids)
+ "Handle obby 'sync_doclist_document' message."
+ (with-parsed-arguments ((doc-id number)
+ (owner-id number)
+ (suffix number)
+ (encoding coding-system))
+ (with-slots (connection remaining-items) this
+ (with-slots (session) connection
+ ;; Retrieve the subscribed users
+ (let ((subscribed-users
+ (mapcar
+ (lambda (user-id)
+ (with-parsed-arguments ((user-id number))
+ (rudel-find-user session user-id
+ #'= #'rudel-id)))
+ subscribed-user-ids)))
+
+ ;; Make a new document with the list of subscribed users.
+ (rudel-add-document session (rudel-obby-document
+ name
+ :subscribed subscribed-users
+ :id doc-id
+ :owner-id owner-id
+ :suffix suffix))))
+
+ ;; Decrease number of not yet received synchronization items.
+ (decf remaining-items)))
+ nil)
+
+(defmethod rudel-obby/obby_sync_final
+ ((this rudel-obby-client-state-session-synching))
+ "Handle obby 'sync_final' message."
+ 'idle)
+
+(defmethod object-print ((this rudel-obby-client-state-session-synching)
+ &rest strings)
+ "Append number of remaining items to string representation."
+ (with-slots (remaining-items) this
+ (call-next-method this (format " remaining: %d" remaining-items))))
+
+
+;;; Class rudel-obby-client-state-subscribing
+;;
+
+(defclass rudel-obby-client-state-subscribing
+ (rudel-obby-client-connection-state
+ rudel-obby-document-handler)
+ ((document :initarg :document
+ :type rudel-obby-document-child
+ :documentation
+ ""))
+ "")
+
+(defmethod rudel-enter ((this rudel-obby-client-state-subscribing)
+ user document)
+ "When entering this state, send a subscription request to the server."
+ (with-slots ((document1 :document)) this
+ (setq document1 document)
+
+ (with-slots ((doc-id :id) owner-id) document1
+ (with-slots (user-id) user
+ (rudel-send this "obby_document"
+ (format "%x %x" owner-id doc-id)
+ "subscribe"
+ (format "%x" user-id)))))
+ nil)
+
+(defmethod rudel-obby/obby_document/sync_init
+ ((this rudel-obby-client-state-subscribing)
+ document num-bytes)
+ "Handle obby 'sync_init' message."
+ (with-parsed-arguments ((num-bytes number))
+ (with-slots (documents) this
+ (if (= num-bytes 0)
+ 'idle
+ (list 'document-synching document num-bytes))))
+ )
+
+
+;;; Class rudel-obby-client-state-document-synching
+;;
+
+(defclass rudel-obby-client-state-document-synching
+ (rudel-obby-client-connection-state
+ rudel-obby-document-handler)
+ ((document :initarg :document
+ :type rudel-obby-document-child
+ :documentation
+ "")
+ (all-bytes :initarg :all-bytes
+ :type (integer 0)
+ :documentation
+ "")
+ (remaining-bytes :initarg :remaining-bytes
+ :type (integer 0)
+ :documentation
+ ""))
+ "")
+
+(defmethod rudel-enter ((this rudel-obby-client-state-document-synching)
+ document num-bytes)
+ ""
+ (with-slots ((document1 :document) all-bytes remaining-bytes) this
+ (setq document1 document
+ all-bytes num-bytes
+ remaining-bytes num-bytes))
+ nil)
+
+(defmethod rudel-obby/obby_document/sync_chunk
+ ((this rudel-obby-client-state-document-synching)
+ document data user-id)
+ "Handle obby 'sync_chunk' message."
+ (with-parsed-arguments ((user-id number))
+ (with-slots (connection remaining-bytes) this
+ (with-slots (session) connection
+ (let* ((user (unless (zerop user-id)
+ (rudel-find-user session user-id
+ #'= #'rudel-id)))
+ (operation (rudel-insert-op "bulk-insert"
+ :from nil
+ :data data)))
+ (rudel-remote-operation document user operation)))
+
+ ;; After all bytes are transferred, go back to idle state.
+ (decf remaining-bytes (string-bytes data))
+ (if (= remaining-bytes 0)
+ 'idle
+ nil)))
+ )
+
+(defmethod object-print ((this rudel-obby-client-state-document-synching)
+ &rest strings)
+ "Append number of remaining items to string representation."
+ (with-slots (remaining-bytes) this
+ (call-next-method this (format " remaining: %d" remaining-bytes))))
+
+
+;;; Class rudel-obby-client-state-they-finalized
+;;
+
+(defclass rudel-obby-client-state-they-finalized
+ (rudel-obby-client-connection-state)
+ ()
+ "State used to indicate that the connection was closed by the peer.")
+
+
+;;; Client connection states.
+;;
+
+(defvar rudel-obby-client-connection-states
+ '((new . rudel-obby-client-state-new)
+ (encryption-negotiate . rudel-obby-client-state-encryption-negotiate)
+ (encryption-start . rudel-obby-client-state-encryption-start)
+ (joining . rudel-obby-client-state-joining)
+ (join-failed . rudel-obby-client-state-join-failed)
+ (idle . rudel-obby-client-state-idle)
+ (session-synching . rudel-obby-client-state-session-synching)
+ (subscribing . rudel-obby-client-state-subscribing)
+ (document-synching . rudel-obby-client-state-document-synching)
+ (they-finalized . rudel-obby-client-state-they-finalized))
+ "Name symbols and classes of connection states.")
+
+
+;;; Class rudel-obby-connection
+;;
+
+(defclass rudel-obby-connection (rudel-obby-socket-owner
+ rudel-connection
+ rudel-state-machine)
+ ((info :initarg :info
+ :type list
+ :documentation
+ "Stores connection information for later use.")
+ (contexts :initarg :contexts
+ :type hash-table
+ :documentation
+ "Contains jupiter context objects for all
+documents."))
+ "Class rudel-obby-connection ")
+
+(defmethod initialize-instance ((this rudel-obby-connection) &rest slots)
+ ;; Initialize slots of THIS
+ (when (next-method-p)
+ (call-next-method))
+
+ ;; Create a new hash-table object to hold jupiter contexts
+ ;; associated to documents.
+ (with-slots (contexts) this
+ (setq contexts (make-hash-table :test #'equal)))
+
+ ;; Register states.
+ (rudel-register-states this rudel-obby-client-connection-states)
+ )
+
+(defmethod rudel-register-state ((this rudel-obby-connection)
+ symbol state)
+ "Register SYMBOL and STATE and set connection slot of STATE."
+ ;; Associate THIS connection to STATE.
+ (oset state :connection this)
+
+ ;; Register STATE.
+ (when (next-method-p)
+ (call-next-method))
+ )
+
+(defmethod rudel-disconnect ((this rudel-obby-connection))
+ ""
+ (when (next-method-p)
+ (call-next-method)))
+
+(defmethod rudel-close ((this rudel-obby-connection))
+ ""
+ ;; Move the state machine into an error state.
+ (rudel-switch this 'they-finalized)
+
+ ;; Terminate the session.
+ (with-slots (session) this
+ (rudel-end session)))
+
+(defmethod rudel-find-context ((this rudel-obby-connection) document)
+ "Return the jupiter context associated to DOCUMENT in THIS connection."
+ (with-slots (contexts) this
+ (gethash (oref document :id) contexts)))
+
+(defmethod rudel-add-context ((this rudel-obby-connection) document)
+ "Add a jupiter context for DOCUMENT to THIS connection."
+ (with-slots (contexts) this
+ (with-slots ((doc-name :object-name) (doc-id :id)) document
+ (puthash doc-id
+ (jupiter-context (format "%s" doc-name))
+ contexts)))
+ )
+
+(defmethod rudel-remove-context ((this rudel-obby-connection) document)
+ "Remove the jupiter context associated to DOCUMENT from THIS connection."
+ (with-slots (contexts) this
+ (remhash (oref document :id) contexts)))
+
+(defmethod rudel-message ((this rudel-obby-connection) message)
+ "Dispatch MESSAGE to the current state of THIS object.
+If the state has no suitable method, generate a warning, but do
+nothing else."
+ ;; Dispatch message to state.
+ (rudel-accept this message))
+
+(defmethod rudel-change-color- ((this rudel-obby-connection) color)
+ ""
+ (rudel-send this "obby_user_colour"
+ (rudel-obby-format-color color)))
+
+(defmethod rudel-publish ((this rudel-obby-connection) document)
+ ""
+ ;; Create a new jupiter context for DOCUMENT.
+ (rudel-add-context this document)
+
+ ;; Announce the new document to the server.
+ (with-slots ((name :object-name) id buffer) document
+ (rudel-send this "obby_document_create"
+ (format "%x" id)
+ name
+ "UTF-8"
+ (with-current-buffer buffer
+ (buffer-string))))
+ )
+
+(defmethod rudel-unpublish ((this rudel-obby-connection) document)
+ "Remove DOCUMENT from the obby session THIS is connected to."
+ ;; Request removal of DOCUMENT.
+ (with-slots ((doc-id :id) owner-id) document
+ (rudel-send this "obby_document_remove"
+ (format "%x %x" owner-id doc-id)))
+
+ ;; Remove the jupiter context for DOCUMENT.
+ (rudel-remove-context this document)
+ )
+
+(defmethod rudel-subscribe-to ((this rudel-obby-connection) document)
+ ""
+ ;; Create a new jupiter context for DOCUMENT.
+ (rudel-add-context this document)
+
+ ;; Switch to subscribing state and wait until the state goes back to
+ ;; idle.
+ (with-slots (session) this
+ (with-slots (self) session
+ (rudel-switch this 'subscribing self document)))
+
+ (lexical-let ((reporter (make-progress-reporter "Subscribing " 0.0 1.0)))
+ (flet ((display-progress (state)
+ (cond
+ ;; Syncing document content, we can provide detailed progress.
+ ((and (consp state)
+ (eq (car state) 'document-synching))
+ (with-slots (all-bytes remaining-bytes) (cdr state)
+ (progress-reporter-force-update
+ reporter
+ (- 1.0 (/ (float remaining-bytes) (float all-bytes)))
+ (format "Subscribing (%s) " (car state)))))
+
+ ;; For other states, we just spin.
+ ((consp state)
+ (progress-reporter-force-update
+ reporter 0.5
+ (format "Subscribing (%s) " (car state))))
+
+ ;; Done
+ (t
+ (progress-reporter-force-update reporter 1.0 "Subscribing ")
+ (progress-reporter-done reporter)))))
+ (rudel-state-wait this '(idle) '(they-finalized) #'display-progress)))
+
+ ;; We receive a notification of our own subscription from the
+ ;; server. Consequently we do not add SELF to the list of subscribed
+ ;; users of DOCUMENT.
+ )
+
+(defmethod rudel-unsubscribe-from ((this rudel-obby-connection) document)
+ ""
+ ;; Delete the jupiter context for DOCUMENT.
+ (rudel-remove-context this document)
+
+ ;; Announce the end of our subscription to the server.
+ (with-slots (session) this
+ (with-slots (user-id) (oref session :self)
+ (with-slots ((doc-id :id) owner-id) document
+ (rudel-send this "obby_document"
+ (format "%x %x" owner-id doc-id)
+ "unsubscribe"
+ (format "%x" user-id)))))
+
+ ;; We receive a notification of the end of our own subscription from
+ ;; the server. Consequently we do not remove SELF from the list of
+ ;; subscribed users of DOCUMENT.
+ )
+
+(defmethod rudel-local-insert ((this rudel-obby-connection)
+ document position data)
+ ""
+ (rudel-local-operation
+ this
+ document
+ (jupiter-insert "insert" :from position :data data)))
+
+(defmethod rudel-local-delete ((this rudel-obby-connection)
+ document position length)
+ ""
+ (rudel-local-operation
+ this
+ document
+ (jupiter-delete "delete" :from position :to (+ position length))))
+
+(defmethod rudel-local-operation ((this rudel-obby-connection)
+ document operation)
+ "Handle OPERATION performed on DOCUMENT by sending a message through THIS connection."
+ ;; Convert character positions in OPERATION to byte positions, since
+ ;; the obby protocol works with byte positions, but Emacs uses
+ ;; character positions.
+ (with-slots (buffer) document
+ (rudel-obby-char->byte operation buffer))
+
+ ;; Find jupiter context for DOCUMENT.
+ (let ((context (rudel-find-context this document)))
+
+ ;; Notify the server of the operation.
+ (with-slots (owner-id (doc-id :id)) document
+ (with-slots (local-revision remote-revision) context
+ (apply #'rudel-send
+ this
+ "obby_document"
+ (format "%x %x" owner-id doc-id)
+ "record"
+ (format "%x" local-revision)
+ (format "%x" remote-revision)
+ (rudel-operation->message operation))))
+
+ ;; Submit the operation to the jupiter context.
+ (jupiter-local-operation context operation))
+ )
+
+(defmethod rudel-remote-operation ((this rudel-obby-connection)
+ document user
+ remote-revision local-revision
+ operation)
+ "Handle OPERATION received through THIS connection performed by USER on DOCUMENT."
+ (let* (;; Find jupiter context for DOCUMENT.
+ (context (rudel-find-context this document))
+ ;; And transform the operation.
+ (transformed (jupiter-remote-operation
+ context
+ remote-revision local-revision
+ operation)))
+
+ ;; Convert byte positions in OPERATION to character positions,
+ ;; since the obby protocol works with byte positions, but Emacs
+ ;; uses character positions.
+ (with-slots (buffer) document
+ (rudel-obby-byte->char transformed buffer)) ;; TODO operation's responsibility?
+
+ ;; Apply the transformed operation to the document.
+ (rudel-remote-operation document user transformed))
+ )
+
+(provide 'rudel-obby-client)
+;;; rudel-obby-client.el ends here
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