implemented a watchdog

reader_data/sarah/src/reader.py

@@ -49,13 +49,13 @@ def main():
   #create a backup of the data file
   shutil.copy('/home/zutritt/Documents/sarah/data.csv', '/home/zutritt/Documents/sarah/logs/' + datetime.today().strftime('%Y%m%d') + '_data_backup.csv')
 
-  #read the data file once. it will be re-read, if we don't know the UID of a read card or the card is expired. 
+  #read the data file once. it will be re-read, if we don't know the UID of a read card or the card is expired.
   #this saves read/write cycles on the SD card
   data = pd.read_csv(r'/home/zutritt/Documents/sarah/data.csv') #,names=col_names)
 
   #mail loop
   while True:
-    
+
     #try reading a tag
     time.sleep(0.5)
     uid = pn532.read_passive_target(timeout=0.5)
@@ -77,12 +77,22 @@ def main():
         debug_file = open("/home/zutritt/Documents/sarah/logs/"+datetime.today().strftime('%Y%m%d')+"_debug_log.csv", "a")
         debug_file.write("\n"+datetime.now().strftime("%d/%m/%Y %H:%M:%S") + ", Manual open via website.")
         debug_file.close()
-	with open("/home/zutritt/Documents/sarah/logs/"+ datetime.today().strftime('%Y%m%d') +"_entrance_log.csv", "a") as x:
-           x.write("Manual entry via website, " + datetime.now().strftime("%d/%m/%Y %H:%M:%S") + "\n")
-           x.close()
+        with open("/home/zutritt/Documents/sarah/logs/"+ datetime.today().strftime('%Y%m%d') +"_entrance_log.csv", "a") as x:
+               x.write("Manual entry via website, " + datetime.now().strftime("%d/%m/%Y %H:%M:%S") + "\n")
+               x.close()
 
         os.remove('/home/zutritt/Documents/sarah/system_request_commands/manual_door_open_request_set')
-    
+
+
+    #in order to be able to implement a watchdog, the system checks for a file and deletes it is it's there
+    if os.path.isfile('/home/zutritt/Documents/sarah/system_request_commands/watchdog_attention_request_set'):
+        #if this file exists, there was a watchdog request made
+        debug_file = open("/home/zutritt/Documents/sarah/logs/"+datetime.today().strftime('%Y%m%d')+"_debug_log.csv", "a")
+        debug_file.write("\n"+datetime.now().strftime("%d/%m/%Y %H:%M:%S") + ", answered the watchdog.")
+        debug_file.close()
+        os.remove('/home/zutritt/Documents/sarah/system_request_commands/watchdog_attention_request_set')
+
+
     #after reading a tag, we check if any numbers have been read
     #no numbers mean no tag has been detected
     if (not isinstance(uid,bytearray)):
@@ -103,7 +113,7 @@ def main():
        line = data.query("uid == @uid")
        print(line)
        expiration_date = datetime.strptime(str(list(line["expire"])[0]), "%Y-%m-%d")
-       
+
        #check if the card is expired
        if datetime.now() < expiration_date:
 
@@ -122,8 +132,8 @@ def main():
        else: #card is expired
          debug_file.write(", Name:" + str(list(line["name"])[0]) + ", Matrikelnummer:" + str(list(line["matrikelnummer"])[0]) + ", !EXPIRED! no entry!")
          try:
-           data = pd.read_csv(r'/home/zutritt/Documents/sarah/data.csv') #read the file again, in case something has changed 
-           debug_file.write(" (data.csv reloaded)") 
+           data = pd.read_csv(r'/home/zutritt/Documents/sarah/data.csv') #read the file again, in case something has changed
+           debug_file.write(" (data.csv reloaded)")
          except OSError as e:
            debug_file.write(", !data.csv reloaded failed!")
 

reader_data/sarah/src/sarahs_watchdog.py

@@ -0,0 +1,71 @@
+import smtplib, ssl
+from datetime import datetime
+import time
+import os
+from email.mime.text import MIMEText
+
+#
+# This tool was written by Pet (pet@fet.at) in 6.2022
+#
+# It is a watchdog for the RFID reader "sarah", in reader.py
+#
+
+def main():
+
+  print("Watchdog watches! Started at: " + datetime.now().strftime("%d/%m/%Y %H:%M:%S"))
+
+  #if the file is already there, sarah didn't anwer last time and we don't need to send an additional mail
+  if os.path.isfile('/home/zutritt/Documents/sarah/system_request_commands/watchdog_attention_request_set'):
+    print("Sarah was down the last time we checked, no new check initiated. ")
+
+  #create a file which should be removed by the reader.py
+  with open("/home/zutritt/Documents/sarah/system_request_commands/watchdog_attention_request_set", "a") as x:
+    x.write(datetime.now().strftime("%d/%m/%Y %H:%M:%S") + ", Watchdog request set. \n")
+    x.close()
+    print("Watchdog file written.")
+
+  #wait for the read to delete the file
+  time.sleep(10)
+
+  #if the file is still there, sarah didn't anwer
+  if os.path.isfile('/home/zutritt/Documents/sarah/system_request_commands/watchdog_attention_request_set'):
+    print("Sarah didn't answer, we need to send a mail to the lab people. ")
+    send_mail()
+  else:
+    print("Sarah answered, everything is good.")
+
+def send_mail():
+
+  debug_file_text = open("/home/zutritt/Documents/sarah/logs/"+datetime.today().strftime('%Y%m%d')+"_debug_log.csv", "r").read()
+
+  port = 587  # For starttls
+  smtp_server = "buran.htu.tuwien.ac.at"
+  sender_email = "doorknob@fet.at"
+  sender_username = "doorknob"
+  receiver_email = "lab@fet.at"
+  password = "JYgPXDWuX47N6ef"
+
+
+  message = "Hallo, \nich bin Sarahs Watchdog. Sarah, die Türöffnerin im FET Lab, reagiert nicht. \n" +\
+    "Hier ein paar Logs zum debuggen:\n" + \
+    "Es ist jetzt: " + datetime.now().strftime("%d/%m/%Y %H:%M:%S")  + "\nDas Debug file beinhaltet: \n" + debug_file_text
+
+
+  msg = MIMEText(message)
+
+  msg['Subject'] = 'FET Doorknob issues'
+  msg['From'] = sender_email
+  msg['To'] = receiver_email
+
+  context = ssl.create_default_context()
+  with smtplib.SMTP(smtp_server, port) as server:
+    server.ehlo()  # Can be omitted
+    server.starttls(context=context)
+    server.ehlo()  # Can be omitted
+    server.login(sender_username, password)
+    server.sendmail(sender_email, receiver_email, msg.as_string())
+
+  print("Mail sent.")
+
+if __name__ == '__main__':
+  main()