Update remindme_caldav service to use log directory

- Changed ExecStart command to include a new log directory option (--logdir) instead of a single log file (--logfile).

.gitignore

@@ -1,4 +1,5 @@
 config_local.toml
 status
 alert_history
+log
 __pycache__

Makefile

@@ -0,0 +1,18 @@
+install:
+	sudo apt-get update && sudo apt install python3-venv -y
+	sudo mkdir -p /opt/remindme_caldav/logs /etc/remindme_caldav
+	python3 -m venv /opt/remindme_caldav/.venv
+	cp remindme_caldav.py alert_processor.py /opt/remindme_caldav/
+	. /opt/remindme_caldav/.venv/bin/activate && pip3 install -r requirements.txt
+	sudo cp remindme_caldav.service /etc/systemd/system/
+	sudo cp config.toml /etc/remindme_caldav/config.toml
+	sudo systemctl daemon-reload
+	sudo systemctl enable remindme_caldav.service
+	sudo systemctl start remindme_caldav.service
+
+uninstall:
+	sudo systemctl stop remindme_caldav.service
+	sudo systemctl disable remindme_caldav.service
+	rm -rf /opt/remindme_caldav
+	rm -rf /etc/remindme_caldav
+	rm /etc/systemd/system/remindme_caldav.service

README.md

@@ -1,3 +1,96 @@
 # remindme_caldav
+## A Calendar Alerting Daemon
+
+## Purpose
+This script is a simple calendar alerting daemon written in Python. It monitors
+.ics files for changes and sends alerts based on the events' start times,
+recurrence rules, and alert triggers defined within these files. The main
+purpose of this script is to provide reminders or notifications about upcoming
+events.
+
+## How it Works
+The script works by parsing .ics files using the `icalendar` library, which
+converts them into a Python dictionary format for easier manipulation. It then
+processes each event and calculates when the next alert should be triggered
+based on the event's start time, recurrence rules, and alert triggers. If an
+alert is due to trigger, it sends a notification via email or XMPP (an instant
+messaging protocol).
+
+The script also monitors for changes in the directory containing .ics files
+using the `watchdog` library. When a file is modified, created, or deleted, it
+updates its internal list of events accordingly.
+
+## How to Use It
+This script should be used with a calendar syncing service such as vdirsyncer.
+vdirsyncer can be scheduled using cron to sync regularly from the CalDav
+server.
+
+To use this script, you need Python 3 installed on your system. You can install
+the required libraries by running:
+
+```bash
+pip install -r requirements.txt
+```
+
+You also need a .toml configuration file with the following structure:
+```toml
+[app]
+calendar_dir = "/path/to/your/ics/files"
+email_address = "your-email@example.com"
+smtp_server = "smtp.example.com"
+smtp_port = 587
+smtp_username = "your-username"
+smtp_password = "your-password"
+...
+```
+The config file is passed to the script with the `--config` argument.
+
+You can then run the script with:
+```bash
+python3 remindme_caldav.py --config /path/to/your/config.toml
+```
+
+## Installation
+A Makefile and systemd service file is also included for Debian/Ubuntu based
+systems. Make sure to modify the config file in the source directory before
+installation. Also, please ensure that the calendar_dir exists and syncing
+from a CalDav server before running the script.
+
+This Makefile does the following:
+  - install: Installs Python 3.11, creates a virtual environment in
+    /opt/remindme_caldav/.venv, installs dependencies from requirements.txt
+    into this virtual environment, copies the script to /opt/remindme_caldav/,
+    copies the config file to /etc/remindme_caldav and sets up the systemd
+    service file. It also sets up the logging dir in /opt/remindme_caldav/logs.
+
+  - uninstall: Stops and disables the systemd service, removes the installation
+    directory (/opt/remindme_caldav/), and deletes the systemd service file.
+
+## Logging
+The script uses Python's built-in logging module to handle logging. The
+setup_logging(log_location) function sets up basic configuration for the
+logger, including the log file location and format. 
+
+Log levels are used to categorize logs based on their severity: DEBUG, INFO,
+WARNING, ERROR, CRITICAL. By default, the log level is set to INFO. This can
+be modified by passing a --loglevel argument when running the script.
+
+The setup_log_location(logdir) function sets up the locations for three types
+of logs: log, status, and alert_history. 
+
+ - Log Location: This is where script logs are stored. These logs contain
+   information about the general operation of the script, such as when it
+   starts or stops, what files it's processing, errors etc. The logdir argument
+   specifies the directory where these log files will be created. 
+
+ - Status Location: This file contains information about the current state of
+   each event being monitored by the script. It includes details such as the
+   current time, the name of the event, its recurrence dates, and when the
+   next alert will be triggered. The purpose of this file is to provide a
+   real-time status update on what's happening in the script.
+
+ - Alert History Location: This file logs all alerts that have been sent out
+   by the script. It includes details such as the timestamp when the alert was
+   triggered, and the definition time of the alert. The purpose of this file
+   is to keep a record of all alerts that have been sent.
 
-A simple script to send alerts/reminders for caldav events.

config.toml

@@ -1,16 +1,15 @@
-# Modify to your requirements
+# Modify to your requirements. See readme for example.
 [app]
-calendar_dir = "FULL_PATH_TO_.ICS_CALENDAR_FILES"
+calendar_dir =
+
 [email]
-smtp_server = "SMTP.PROVIDER.DOMAIN"
-port = 587
-username = "YOUR_USERNAME"
-password = "YOUR_PASSWORD"
-recipient = "RECIPIENT_EMAIL_ADDRESS"
+smtp_server =
+port =
+username =
+password =
+recipient =
 
 [xmpp]
-jid = 'YOUR_USERNAME@SERVER_INSTANCE.DOMAIN' 
-password = 'YOUR_PASSWORD'  
-recipient = 'RECIPIENT_USERNAME@SERVER_INSTANCE.DOMAIN'
-
-[notify-send]
+jid =
+password =
+recipient =

remindme_caldav.py

@@ -12,38 +12,81 @@ from pathlib import Path
 import argparse, textwrap, logging
 from alert_processor import AlertProcessor
 
-def setup_logger(loglevel):
-    """Setup basic logging."""
-    loglevel = getattr(logging, loglevel.upper(), None)
-    
-    if not isinstance(loglevel, int):
-        raise ValueError('Invalid log level: %s' % loglevel)
-        
-    logging.basicConfig(filename='app.log', filemode='w', format='%(name)s - %(levelname)s - %(message)s')
 logger = logging.getLogger()
-    logger.setLevel(loglevel)
+
+def setup_log_location(logdir):
+    if not Path(logdir).is_dir():
+        raise FileNotFoundError(f"Log dir '{logdir}' does not exist. Be sure to create it first.")
+    log_location = os.path.join(logdir, "log")
+    status_location = os.path.join(logdir, "status")
+    alert_history_location = os.path.join(logdir, "alert_history")
+    return log_location, status_location, alert_history_location
+
+def setup_logging(log_location):
+    log_format='[%(levelname)s] %(asctime)s %(message)s'
+    logging.basicConfig(filename = log_location, format=log_format, level=logging.INFO)
 
 def parse_args():
     """Parse command line arguments."""
     parser = argparse.ArgumentParser(description="A simple calendar alerting daemon written in Python")
     parser.add_argument('--config', type=str, help='Path to config file. Must be .toml')
-    parser.add_argument('--loglevel', choices=['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL'], default='INFO', help='Set the logging level')
+    parser.add_argument('--logdir', type=str, help='Path to logfile directory', default = "logs")
+    parser.add_argument('--loglevel', help="Set the log level (DEBUG, INFO, WARNING, ERROR, CRITICAL)", 
+                        type=str, choices=['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL'])
     args = parser.parse_args()
     if args.config is None:
-        raise RuntimeError("No config file provided. Please use --config path_to_config.toml")
+        logger.error("No config file provided. Please use --config path_to_config.toml")
+        sys.exit(1)
     return args
 
 def read_file(filename):                                       
     try:                                                       
         return Path(filename).read_text()                      
-    except FileNotFoundError as e:                             
-        raise RuntimeError(f"Error: The specified file does not exist. {e}")
+    except FileNotFoundError:                             
+        raise FileNotFoundError("Error: The specified file does not exist.")
                                                                
 def parse_toml(content):                                       
     try:                                                       
-        return toml.loads(content)                             
+        config = toml.loads(content)                             
+        if config is None:
+            logging.error("Invalid config")
+            sys.exit(1)
+        return config
+    except Exception:                                     
+        raise RuntimeError("Error: Failed to parse TOML file.")             
+
+def get_calendar_dir(config):
+    cal_dir = Path(config["app"]["calendar_dir"])
+    if not cal_dir.is_dir():                                                  
+        logger.error(f"The provided path to .ics files does not exist: '{cal_dir}'") 
+        sys.exit(1)
+    return cal_dir
+
+def parse_calendar_files(cal_dir):
+    files = []
+    no_files_detected = True
+    logger.info(f"Looking for calendar files in {cal_dir}...")
+    while no_files_detected is True:
+        files = list(cal_dir.glob('*.ics'))                        
+        if len(files) != 0:
+            logger.info("Calendar files detected in sync location!")
+            no_files_detected = False
+    return files
+
+def construct_initial_event_dict(cal_dir):
+    files = parse_calendar_files(cal_dir)
+    calendar_parser = CalendarParser()
+    event_list = []
+    for file in files:
+        with open(file, 'r') as f:
+            cal_str = f.read()
+        try:
+            event_dict = calendar_parser.parse_calendar(cal_str)
         except Exception as e:
-        raise RuntimeError(f"Error: Failed to parse TOML file. {e}")             
+            logger.warning(f"Error parsing event, skipping. {file}. Error message {e}")
+            continue
+        event_list.append(event_dict)
+    return event_list
 
 def calculate_event_hash(event):
     return hashlib.md5(json.dumps(event, sort_keys=True, cls=DateTimeEncoder).encode()).hexdigest()
@@ -65,46 +108,41 @@ class FileChangeHandler(FileSystemEventHandler):
         self.event_list = event_list   
 
     def on_modified(self, event):
-        logging.debug(f"File modified: {event.src_path}")
+        logger.info(f"File modified: {event.src_path}")
         if not event.is_directory:    
             try:
                 with open(event.src_path, 'r') as f:
                     cal_str = f.read()
             except Exception as e:
-                logging.error(f"Not a valid file: {event.src_path}. Error: {e}")
+                logger.error(f"Not a valid file: {event.src_path}. Error: {e}")
                 return
-
             try:
                 event_dict = self.calendar_parser.parse_calendar(cal_str)  # Use the instance to call parse_calendar method
             except Exception as e:
-                logging.error(f"Failed to parse calendar event at: {event.src_path}. Error: {e}")
+                logger.error(f"Failed to parse calendar event at: {event.src_path}. Error: {e}")
                 return
-            
             self.handle_modified(old_event=None, event_dict=event_dict)
 
     def on_deleted(self, event):
-        logging.debug(f"File deleted: {event.src_path}")
+        logger.info(f"File deleted: {event.src_path}")
         if not event.is_directory:    
             uid = os.path.splitext(os.path.basename(event.src_path))[0]    # Get the UID from the file path without extension
-            
             self.handle_modified(old_event=None, event_dict={"uid": uid}, remove=True)
     
     def on_created(self, event):
-        logging.debug(f"File created: {event.src_path}")
+        logger.info(f"File created: {event.src_path}")
         if not event.is_directory:    
             try:
                 with open(event.src_path, 'r') as f:
                     cal_str = f.read()
             except Exception as e:
-                logging.error(f"Not a valid file: {event.src_path}. Error: {e}")
+                logger.warning(f"Not a valid file: {event.src_path}. Error: {e}")
                 return
-                
             try:
                 event_dict = self.calendar_parser.parse_calendar(cal_str)  # Use the instance to call parse_calendar method
             except Exception as e:
-                logging.error(f"Failed to parse calendar event at: {event.src_path}. Error: {e}")
+                logger.warning(f"Failed to parse calendar event at: {event.src_path}. Error: {e}")
                 return
-            
             self.handle_modified(old_event=None, event_dict=event_dict)
     
     def handle_modified(self, old_event, event_dict, remove=False):
@@ -112,10 +150,9 @@ class FileChangeHandler(FileSystemEventHandler):
             for i, old_event in enumerate(self.event_list):
                 if old_event["uid"] == event_dict["uid"]:  
                     old_hash = old_event["hash"]
-                    
                     new_hash = calculate_event_hash(event_dict)
                     if new_hash != old_hash:    
-                        logging.debug(f"Event with UID {old_event['uid']} has been modified or deleted")
+                        logger.info(f"Event with UID {old_event['uid']} has been modified or deleted")
                         self.event_list[i] = event_dict
                     break
             else:    
@@ -123,7 +160,7 @@ class FileChangeHandler(FileSystemEventHandler):
         else:   # If remove is True, remove the event from the list
             for i, old_event in enumerate(self.event_list):
                 if old_event["uid"] == event_dict["uid"]:   
-                    logging.debug(f"Event with UID {old_event['uid']} has been deleted")
+                    logger.info(f"Event with UID {old_event['uid']} has been deleted")
                     
                     del self.event_list[i]
                     break
@@ -131,15 +168,6 @@ class FileChangeHandler(FileSystemEventHandler):
 class RecurringEventGenerator:
     """
     A class to generate recurring events based on a start date and a recurrence rule.
-    
-    Attributes:
-        dtstart (datetime): The starting date of the event series.
-        rrule (rrule): The recurrence rule for the event series.
-        
-    Methods:
-        __init__(self, dtstart, rrule): Initializes the class with a start date and a recurrence rule.
-        generate(self): Generates the recurring events based on the start date and recurrence rule. 
-            Returns a dictionary containing information about the recurring events.
     """
     def __init__(self, dtstart, rrule):
         self.dtstart = dtstart
@@ -212,15 +240,6 @@ class CalendarParser:
     def parse_calendar(self, cal_str):
         """
         Parse a calendar string and process each event. 
-        
-        Args:
-            cal_str (str): The iCalendar string to be parsed.
-            
-        Returns:
-            dict: A dictionary containing information about the processed events.
-            
-        Raises:
-            RuntimeError: If there are no dates returned for an event or if there is an error calculating the event hash.
         """
         # Parse the calendar
         cal = self.parse_icalendar(cal_str)
@@ -233,6 +252,8 @@ class CalendarParser:
             generator = RecurringEventGenerator(dtstart, event_dict["rrule"])
             recur_info = generator.generate() 
             event_dates = self.remove_exdates(event_dict["exdate"], recur_info["recur_dates"])
+            if len(event_dates) == 0:
+                logging.warning(f"No event dates for event: '{event['summary']}'")
 
             valarms = self.process_valarm(event)
             
@@ -253,7 +274,7 @@ class CalendarParser:
             }
             try:
                 new_hash = calculate_event_hash(event_dict)  # Calculate the hash of the event dictionary
-            except Exception as e:
+            except Exception:
                 raise RuntimeError("Error calculating event hash")
             event_dict["hash"] = new_hash  # Store the hash in the event dictionary
             return event_dict
@@ -261,30 +282,15 @@ class CalendarParser:
     def parse_icalendar(self, cal_str):
         """
         Parse a calendar string into an iCalendar object. 
-        
-        Args:
-            cal_str (str): The iCalendar string to be parsed.
-            
-        Returns:
-            Calendar: An iCalendar object representing the parsed calendar.
-            
-        Raises:
-            RuntimeError: If there is an error parsing the calendar.
         """
         try:
             return Calendar.from_ical(cal_str)
-        except Exception as e:
-            raise RuntimeError(f"Error parsing calendar. Message from icalendar: {e}")
+        except Exception:
+            raise RuntimeError("Error parsing icalendar.")
             
     def process_event(self, event):
         """
         Process an event from a parsed calendar and extract relevant information. 
-        
-        Args:
-            event (Event): An iCalendar event object to be processed.
-            
-        Returns:
-            dict: A dictionary containing the extracted event information.
         """
         event_info = {
                  "uid": None,
@@ -301,21 +307,12 @@ class CalendarParser:
             try:
                 event_info[info] = event[info]
             except Exception:
-                pass
+                logging.info(f"CalDav componant '{info}' missing for event {event['summary']}")
         return event_info
     
     def dtstart_to_datetime(self, dtstart):
         """
         Convert a date or datetime object into a datetime object with UTC timezone. 
-        
-        Args:
-            dtstart (date/datetime): The date or datetime to be converted.
-            
-        Returns:
-            datetime: A datetime object representing the input date or datetime in UTC timezone.
-            
-        Raises:
-            RuntimeError: If there is an error converting the input to a datetime object.
         """
         # Ensure dates are always as datetime
         try:
@@ -323,22 +320,12 @@ class CalendarParser:
                 return dtstart.replace(tzinfo=pytz.UTC)
             else:
                 return dt.datetime.combine(dtstart, dt.time.min).replace(tzinfo=pytz.UTC)
-        except Exception as e:
-            raise RuntimeError(f"Error converting dtstart to datetime. Message: {e}")
+        except Exception:
+            raise RuntimeError("Error converting dtstart to datetime.")
 
     def remove_exdates(self, exdates, recur_dates):
         """
         Remove dates from a list of recurring event dates that are in the exdate list. 
-        
-        Args:
-            exdates (list): A list of datetime objects representing excluded dates.
-            recur_dates (list): A list of datetime objects representing recurring event dates.
-            
-        Returns:
-            list: A list of datetime objects representing the remaining recurring event dates after removing the exdate dates.
-            
-        Raises:
-            RuntimeError: If there is an error processing the exdates.
         """
         if exdates != []:
             try:
@@ -347,31 +334,27 @@ class CalendarParser:
                 else:
                     exdates = [exdates.dts[0].dt.replace(tzinfo=pytz.UTC)]
                 return [i for i in recur_dates if i not in exdates]
-            except Exception as e:
-                raise RuntimeError(f"Error processing exdates. Message {e}")
+            except Exception:
+                raise RuntimeError("Error processing exdates.")
         else: 
             return recur_dates
 
     def process_valarm(self, event):
         """
         Process VALARM components from an iCalendar event and extract trigger times. 
-        
-        Args:
-            event (Event): An iCalendar event object to be processed.
-            
-        Returns:
-            list: A list of datetime objects representing the extracted trigger times.
         """
         valarms = []
         for subcomponent in event.walk("valarm"):
             valarm = Event.from_ical(subcomponent.to_ical())
             timedelta = valarm["trigger"].dt
             valarms.append(timedelta)
+            if len(valarms) == 0:
+                logging.info(f"No reminders for event: {event['summary']}")
         return valarms
 
 def get_next_alert(event, current_time):
     """
-    This function returns the next alert that should be processed based on the current time.
+    Returns the next alert that should be processed based on the current time.
     """
     event_dates = event["event_dates"]
     valarm_deltas = event["valarms"]
@@ -385,71 +368,38 @@ def get_next_alert(event, current_time):
         next_alert = min(next_alert_list)
     return next_alert - dt.timedelta(seconds=5), next_event
 
-def process_alert(current_time, next_alert, next_event, event, config):
+def process_alert(current_time, next_alert, next_event, event, config, alert_history_location):
     """
-    This function processes a given alert and passes it to a messaging client.
+    Processes a given alert and passes it to a messaging client.
     """
     if current_time >= next_alert and current_time < next_alert + dt.timedelta(seconds=15):
         if len(event["alert_history"]) == 0:
-            logging.debug(f"First alert for '{event['summary']}' detected")
+            logger.info(f"First alert for '{event['summary']}' detected")
             event["alert_history"] = [{"timestamp_alert_triggered": current_time, "alert_defintition_time": next_alert}]
         elif next_alert in [i["alert_defintition_time"] for i in event["alert_history"]]:
             return
         else:
-            logging.debug(f"Posting alert for {event['summary']}!")
+            logger.info(f"Posting alert for {event['summary']}!")
             event["alert_history"].append({"timestamp_alert_triggered": current_time, "alert_defintition_time": next_alert})
         try:
             processor = AlertProcessor(config)
             processor.send_email(event, next_alert, next_event)
         except Exception as e:
-            raise RuntimeError(f"Error sending alert for event {event['summary']}. Message {e}")
-        #processor.send_xmpp(event, next_alert, next_event)
-
-        with open("alert_history", 'a') as f:
+            raise RuntimeError(f"Error sending alert for event. {e}")
+        with open(alert_history_location, 'a') as f:
             f.write(str(event))
         return
 
-def main():
-    # Parse args and config
-    args = parse_args()
-    content = read_file(args.config)
-    config = parse_toml(content)
-   
-    # Get calendar dir
-    cal_dir = Path(config["app"]["calendar_dir"])
-    if not cal_dir.is_dir():                                                  
-        print(f"The provided path to .ics files does not exist: '{cal_dir}'") 
-        sys.exit(1)  # Exit with error code                                   
-
-    #Parse calendar events
-    calendar_parser = CalendarParser()
-    files = list(cal_dir.glob('*.ics'))                        
-    event_list = []  # List to hold dictionaries for each event
-    for file in files:
-        with open(file, 'r') as f:
-            cal_str = f.read()
-        try:
-            event_dict = calendar_parser.parse_calendar(cal_str)
-        except Exception:
-            logging.error(f"Error parsing event, skipping. {file}")
-            continue
-        event_list.append(event_dict)
-
-    #Start file handler to detect changes to calendar dir
-    observer = Observer()
-    handler = FileChangeHandler(event_list)  # Pass event_list here
-    observer.schedule(handler, cal_dir, recursive=True)
-    observer.start()
-
-    #Start main loop
-    try:
-        while True:
-            with open("status", 'w') as f:
-                #Refresh the status file
-                f.write("")
+def daemon(status_location, alert_history_location, config, event_list):
+    with open(status_location, 'w') as f:
+        f.write("") # Refresh the status file
     current_time = dt.datetime.now().replace(tzinfo=pytz.UTC)
     for event in event_list:
+        try:
             next_alert, next_event = get_next_alert(event, current_time)
+        except RuntimeError as e:
+            logger.warning(f"Error getting next alert for {event['summary']}, skipping event. Error message {e}")
+            continue
         if next_alert == None:
             continue
         event_delta = next_alert-current_time
@@ -464,11 +414,45 @@ def main():
             Recur info: {event["recur_info"]}
             Alert history: {event["alert_history"]}\n"""
         monitor_status = textwrap.dedent(monitor_status)
-                with open("status", 'a') as f:
-                    # Write the output to the file
-                    f.write(monitor_status)
+        with open(status_location, 'a') as f:
+            f.write(monitor_status) # Write the output to the file
             f.write("\n")
-                process_alert(current_time, next_alert, next_event, event, config)
+        try:
+            process_alert(current_time, next_alert, next_event, event, config, alert_history_location)
+        except RuntimeError as e:
+            logger.warning(f"Error processing alert for event {event['summary']}. Error message: {e}")
+    return
+
+def main():
+    # Parse args and initiate logging
+    args = parse_args()
+    log_location, status_location, alert_history_location = setup_log_location(args.logdir)
+    setup_logging(log_location)
+    logger = logging.getLogger()
+
+    # Redefine log level if args passed
+    if args.loglevel is not None:
+        numeric_level = getattr(logging, args.loglevel.upper(), None)   # Convert string to integer
+        if isinstance(numeric_level, int):
+            logger = logging.getLogger()
+            logger.setLevel(numeric_level) # Set the log level
+
+    # Setup initial event_list
+    config_file = read_file(args.config)
+    config = parse_toml(config_file)
+    cal_dir = get_calendar_dir(config)
+    event_list = construct_initial_event_dict(cal_dir)
+
+    # Start file handler to detect changes to calendar dir
+    observer = Observer()
+    handler = FileChangeHandler(event_list)
+    observer.schedule(handler, cal_dir, recursive=True)
+    observer.start()
+
+    # Start main loop
+    try:
+        while True:
+            daemon(status_location, alert_history_location, config, event_list)
             time.sleep(1)
     except KeyboardInterrupt:
         observer.stop()

remindme_caldav.service

@@ -0,0 +1,18 @@
+[Unit]
+Description=Calendar Alerting Daemon
+After=network.target
+StartLimitIntervalSec=0
+
+[Service]
+Type=simple
+RestartSec=1
+User=root
+ExecStart=/opt/remindme_caldav/.venv/bin/python3 -u /opt/remindme_caldav/remindme_caldav.py --config /etc/remindme_caldav/config.toml --logdir /opt/remindme_caldav/logs
+Environment="PYTHONUNBUFFERED=1"
+StandardOutput=syslog
+StandardError=syslog
+SyslogIdentifier=remindme_caldav
+
+[Install]
+WantedBy=multi-user.target
+