Added printer class

src/printer.py

@@ -1,4 +1,5 @@
 # Importing the module to mage the connection to the printer.
+from flask import flash
 from escpos.printer import Usb, USBNotFoundError
 from time import sleep, gmtime, strftime
 import os.path
@@ -35,6 +36,27 @@ class Printer(object):
         self.usb_args['idVendor'] = self.device_id
         self.usb_args['idProduct'] = self.vendor_id
 
+    def check_paper(self) -> bool:
+        # Let's check paper status
+        self.app.logger.debug('Checking paper status...')
+        self.printer.open(self.usb_args)
+        status = self.printer.paper_status()
+        match status:
+            case 0:
+                self.app.logger.error('Printer has no more paper, aborting...')
+                flash("No more paper on the printer. Sorry.",category='error')
+                self.printer.close()
+                return False
+            case 1:
+                self.app.logger.warning('Printer needs paper to be changed very soon ! ')
+                flash('Printer needs paper to be changed very soon ! ', category='info')
+                self.printer.close()
+                return True
+            case 2:
+                self.app.logger.debug('Printer has paper, good to go')
+                self.printer.close()
+                return True
+
     def init_printer(self):
 
         # Is the printer online ? Is the communication with the printer successfull ?
@@ -53,6 +75,7 @@ class Printer(object):
             try:
                 if p.is_online():
                     self.ready = True
+                    self.app.logger.debug('Printer online !')
             except Exception as e:
                 pass
 
@@ -64,40 +87,48 @@ class Printer(object):
                 return False
 
 
-        # Let's check paper status.
-        ps = p.paper_status()
-        if ps == 0:
-            self.app.logger.error('Printer has no more paper, aborting...')
-            return False
-        elif ps == 1:
-            self.app.logger.warning('Printer needs paper to be changed very soon ! ')
-            sleep(5)
-        elif ps == 2:
-            self.app.logger.debug('Printer has paper, good to go')
+
 
         # Setting up the printing options.
         p.set(align='center', font='a', bold=False, underline=0, width=1, height=1, density=9, invert=False, smooth=False, flip=False, double_width=False, double_height=False, custom_size=False)
-        # Beware : if we print this every time the printer becomes ready, it means
+        # Beware : if we print every time the printer becomes ready, it means
         # we are printing before and after every print !
-
-        self.printer = p;
+        self.printer = p
         self.ready = True;
         self.printer.close();
+
+        if not self.check_paper():
+            return False
+
         return True
 
-    def print_sms(self, msg):
+    def print_sms(self, msg, signature) -> bool:
         clean_msg = str(msg)
+        clean_signature = str(signature)
 
-        if len(clean_msg) > 256 or len(clean_msg) < 10 :
-            self.app.logger.warning("Could not print message of this length :" + str(len(clean_msg)))
-            return "Could not print message of this length :" + str(len(clean_msg)) + ", needs to be 10 < x <    256"
-        else :
+        if not self.check_paper():
+            return False
+
+        if len(clean_msg) > 256 or len(clean_msg) < 3 :
+            self.app.logger.warning("Could not print message of this length: " + str(len(clean_msg)))
+            flash("Could not print message of this length :" + str(len(clean_msg)) + ", needs to between 3 and 256 caracters long.",category='error')
+            return False
+
+        if len(signature) > 256 or len(signature) < 3:
+            self.app.logger.warning("Could not print message without a signature.")
+            flash("Could not print message without a signature.",category='error')
+            return False
+
+        if not os.getenv('LIPY_DEBUG') == True:
             self.printer.open(self.usb_args);
-            self.printer.textln(strftime("%Y-%m-%d %H:%M:%S", gmtime()))
+            self.printer.set(align='left', font='a', bold=False, underline=0, width=1, height=1, density=8, invert=False, smooth=True, flip=False, double_width=False, double_height=False, custom_size=False)
             self.printer.textln(clean_msg)
+            self.printer.set(align='left', font='b', bold=False, underline=1, width=1, height=1, density=9, invert=False, smooth=True, flip=False, double_width=False, double_height=False, custom_size=False)
+            self.printer.textln("> " + clean_signature + " @ " + strftime("%Y-%m-%d %H:%M:%S", gmtime()))
             self.printer.cut()
             self.printer.close()
-            return "Message printed : " + clean_msg
+        flash("Message printed : " + clean_msg ,category='info')
+        return True
 
     def print_img(self, path):