example 'meshtastic': review & fix DB message storage

examples/meshtastic/lisp/db.lisp

@@ -11,11 +11,12 @@
   (setf *file* (app:in-data-path "db"))
   (ensure-directories-exist *file*)
   (qt:ini-db qt:*cpp* (namestring *file*))
-  (query "create table if not exists messages (mid integer primary key, uid integer, message text)"))
+  (query "create table if not exists messages (mid integer primary key autoincrement, uid integer, message text)"))
 
-(defun save-message (mid uid message)
-  (query "insert into messages (mid, uid, message) values (?, ?, ?)"
-         mid uid message))
+(defun save-message (uid message)
+  "Inserts MESSAGE and returns the new MID."
+  (first (query "insert into messages (uid, message) values (?, ?)"
+                uid message)))
 
 (defun load-message (mid)
   (first (query "select message from messages where mid = ?"
@@ -29,10 +30,6 @@
   (query "select message from messages where uid = ? order by mid"
          uid))
 
-(defun max-message-id ()
-  (let ((val (first (query "select max(mid) from messages"))))
-    (if (numberp val) val 0)))
-
 (defun delete-message (mid) ; see QML
   (query "delete from messages where mid = ?"
          mid)

examples/meshtastic/lisp/lora.lisp

@@ -69,12 +69,12 @@
      (me:make-to-radio :want-config-id *config-id*))
     (q> |playing| ui:*busy* t)))
 
-(defun set-ready (ready name ble-names) ; see Qt
+(defun set-ready (&optional ready name ble-names) ; see Qt
   (setf *ready* ready)
   (when ready
     (setf *ble-names* ble-names)
     (app:toast (x:cc (tr "radio") ": " name) 2)
-    (qlater 'get-node-config))
+    (get-node-config))
   (values))
 
 (defun add-line-breaks (text)
@@ -112,7 +112,7 @@
           (t
            (msg:check-utf8-length (q< |text| ui:*edit*))
            (unless (q< |tooLong| ui:*edit*)
-             (msg:message-id)
+             (msg:new-message-id)
              (when (stringp *receiver*)
                (setf *receiver* (name-to-node *receiver*)))
              (send-to-radio
@@ -304,7 +304,7 @@
 (defun send-admin (admin-message)
   (send-to-radio
    (to-radio :to (me:num *my-node-info*)
-             :id (msg:message-id)
+             :id (msg:new-message-id)
              :hop-limit 3
              :want-ack t
              :priority :reliable

examples/meshtastic/lisp/main.lisp

@@ -10,7 +10,6 @@
   (radios:ini)
   (db:ini)
   (loc:ini)
-  (setf msg:*message-id* (db:max-message-id))
   (if (setting :latest-receiver)
       (msg:show-messages)
       (qlater (lambda () (q> |currentIndex| ui:*main-view* 0)))) ; 'Group'

examples/meshtastic/lisp/messages.lisp

@@ -1,14 +1,19 @@
 (in-package :msg)
 
-(defvar *message-id* 0)
-(defvar *states*     '(:not-received :sending :received))
+(defvar *states*      '(:not-received :sending :received))
+(defvar *message-id*  0)
+(defvar *message-ids* nil "associate (temporary) QML :mid to (unique) DB 'mid'")
 
 (defun ini ()
-  (q> |fontSize| ui:*message-view* (or (app:setting :message-font-size) 18)))
+  (q> |fontSize| ui:*message-view*
+      (or (app:setting :message-font-size) 18)))
 
-(defun message-id ()
+(defun new-message-id ()
   (mod (incf *message-id*) #.(expt 2 32)))
 
+(defun db-mid (mid)
+  (cdr (assoc mid *message-ids*)))
+
 (defun show-message-p (message)
   (let ((user (app:setting :latest-receiver)))
     (and user (or (string= user (getf message :receiver))
@@ -24,9 +29,10 @@
       (x:when-it* (app:setting (getf message :sender) :custom-name)
         (setf (getf message :sender-name) x:it*)))
     (unless loading
-      (db:save-message (getf message :mid)            ; mid
-                       (parse-integer x:it :radix 16) ; uid
-                       (prin1-to-string message)))
+      (let ((db-mid (db:save-message (parse-integer x:it :radix 16) ; uid
+                                     (prin1-to-string message))))
+        (push (cons (getf message :mid) db-mid)
+              *message-ids*)))
     (if (or loading (show-message-p message))
         (qjs |addMessage| ui:*messages* message)
         (let* ((sender (getf message :sender))
@@ -38,12 +44,13 @@
       (q! |positionViewAtEnd| ui:*message-view*))))
 
 (defun change-state (state mid)
-  (let ((i-state (position state *states*))
-        (message (db:load-message mid)))
+  (let* ((i-state (position state *states*))
+         (db-mid (db-mid mid))
+         (message (db:load-message db-mid)))
     (when message
       (setf message (read-from-string message))
       (setf (getf message :ack-state) i-state)
-      (db:update-message mid (prin1-to-string message))
+      (db:update-message db-mid (prin1-to-string message))
       (qjs |changeState| ui:*messages*
            i-state mid))))
 

examples/meshtastic/lisp/package.lisp

@@ -84,7 +84,6 @@
    #:ini
    #:load-message
    #:load-messages
-   #:max-message-id
    #:save-message
    #:update-message))
 
@@ -103,8 +102,8 @@
    #:font-size-changed
    #:font-size-dialog
    #:ini
-   #:message-id
    #:message-press-and-hold
+   #:new-message-id
    #:receiver-changed
    #:show-date
    #:show-messages