flake.nix: add devShell

README.md

@@ -70,8 +70,8 @@ Run `poetry run worblehat --help` for more info
 ### Deadline daemon
 
 - [X] Ability to be notified when deadlines are due
-- [ ] Ability to be notified when books are available
-- [ ] Ability to have expiring queue positions automatically expire
+- [X] Ability to be notified when books are available
+- [X] Ability to have expiring queue positions automatically expire
 
 ### Web version of the program
 

config-template.toml

@@ -33,5 +33,8 @@ from = 'worblehat@pvv.ntnu.no'
 subject_prefix = '[Worblehat]'
 
 [deadline_daemon]
-warn_days_before_borrow_deadline = [ "5", "1" ]
-warn_days_before_expiring_queue_position_deadline = [ "3", "1" ]
+enabled = true
+dryrun = false
+warn_days_before_borrowing_deadline = [ 5, 1 ]
+days_before_queue_position_expires = 14
+warn_days_before_expiring_queue_position_deadline = [ 3, 1 ]

data/arbeidsrom_smal_hylle_5.csv

@@ -12,14 +12,10 @@ isbn, note, bookcase, shelf
 9781292024967, abstract alg, arbeidsrom_smal, 5
 9780471728979, kreyzig, arbeidsrom_smal, 5
 9781847762399, calc 1, arbeidsrom_smal, 5
-9781847762399, calc 1 again, arbeidsrom_smal, 5
 9781787267763, calc 1 nome, arbeidsrom_smal, 5
 9781787267770, calc 2 nome, arbeidsrom_smal, 5
 9780199208258, non lin ode, arbeidsrom_smal, 5
 9788251915953, tabeller, arbeidsrom_smal, 5
-9788251915953, taeller 2, arbeidsrom_smal, 5
-9788251915953, tabeller 3, arbeidsrom_smal, 5
-9788251915953, tabeller 4, arbeidsrom_smal, 5
 9780750304009, fractals and chaos, arbeidsrom_smal, 5
 9788241902116, geometri, arbeidsrom_smal, 5
 9781620402788, simpsons, arbeidsrom_smal, 5

flake.nix

@@ -39,5 +39,9 @@
         ];
       };
     };
+
+    devShells.${system}.default = pkgs.mkShell {
+      packages = with pkgs; [ poetry sqlite ];
+    };
   };
-}
+}

worblehat/cli/main.py

@@ -1,8 +1,8 @@
 from textwrap import dedent
 
 from sqlalchemy import (
-   event,
-   select,
+    event,
+    select,
 )
 from sqlalchemy.orm import Session
 
@@ -191,10 +191,10 @@ class WorblehatCli(NumberedCmd):
 
     def do_exit(self, _: str):
         if self.sql_session_dirty:
-           if prompt_yes_no('Would you like to save your changes?'):
-               self.sql_session.commit()
-           else:
-               self.sql_session.rollback()
+            if prompt_yes_no('Would you like to save your changes?'):
+                self.sql_session.commit()
+            else:
+                self.sql_session.rollback()
         exit(0)
 
 

worblehat/deadline_daemon/main.py

@@ -11,14 +11,25 @@ from worblehat.models import (
     DeadlineDaemonLastRunDatetime,
     BookcaseItemBorrowingQueue,
 )
+
 from worblehat.services.email import send_email
 
 class DeadlineDaemon:
     def __init__(self, sql_session: Session):
+        if not Config['deadline_daemon.enabled']:
+            return
+
         self.sql_session = sql_session
+
         self.last_run = self.sql_session.scalars(
             select(DeadlineDaemonLastRunDatetime),
-        ).one()
+        ).one_or_none()
+
+        if self.last_run is None:
+            logging.info('No previous run found, assuming this is the first run')
+            self.last_run = DeadlineDaemonLastRunDatetime(time=datetime.now())
+            self.sql_session.add(self.last_run)
+            self.sql_session.commit()
 
         self.last_run_datetime = self.last_run.time
         self.current_run_datetime = datetime.now()
@@ -26,6 +37,12 @@ class DeadlineDaemon:
 
     def run(self):
         logging.info('Deadline daemon started')
+        if not Config['deadline_daemon.enabled']:
+            logging.warn('Deadline daemon disabled, exiting')
+            return
+
+        if Config['deadline_daemon.dryrun']:
+            logging.warn('Running in dryrun mode')
 
         self.send_close_deadline_reminder_mails()
         self.send_overdue_mails()
@@ -36,6 +53,97 @@ class DeadlineDaemon:
         self.last_run.time = self.current_run_datetime
         self.sql_session.commit()
 
+    ###################
+    # EMAIL TEMPLATES #
+    ###################
+
+    def _send_close_deadline_mail(self, borrowing: BookcaseItemBorrowing):
+        logging.info(f'Sending close deadline mail to {borrowing.username}@pvv.ntnu.no.')
+        send_email(
+            f'{borrowing.username}@pvv.ntnu.no',
+            'Reminder - Your borrowing deadline is approaching',
+            dedent(f'''
+                Your borrowing deadline for the following item is approaching:
+                
+                {borrowing.item.name}
+                
+                Please return the item by {borrowing.end_time.strftime("%a %b %d, %Y")}
+                ''',
+            ).strip(),
+        )
+
+
+    def _send_overdue_mail(self, borrowing: BookcaseItemBorrowing):
+        logging.info(f'Sending overdue mail to {borrowing.username}@pvv.ntnu.no for {borrowing.item.isbn} - {borrowing.end_time.strftime("%a %b %d, %Y")}')
+        send_email(
+            f'{borrowing.username}@pvv.ntnu.no',
+            'Your deadline has passed',
+            dedent(f'''
+                Your delivery deadline for the following item has passed:
+                
+                {borrowing.item.name}
+                
+                Please return the item as soon as possible.
+                ''',
+            ).strip(),
+        )
+
+
+    def _send_newly_available_mail(self, queue_item: BookcaseItemBorrowingQueue):
+        logging.info(f'Sending newly available mail to {queue_item.username}')
+
+        days_before_queue_expires = Config['deadline_daemon.days_before_queue_position_expires']
+
+        # TODO: calculate and format the date of when the queue position expires in the mail.
+        send_email(
+            f'{queue_item.username}@pvv.ntnu.no',
+            'An item you have queued for is now available',
+            dedent(f'''
+                The following item is now available for you to borrow:
+
+                {queue_item.item.name}
+
+                Please pick up the item within {days_before_queue_expires} days.
+                ''',
+            ).strip(),
+        )
+
+
+    def _send_expiring_queue_position_mail(self, queue_position: BookcaseItemBorrowingQueue, day: int):
+        logging.info(f'Sending queue position expiry reminder to {queue_position.username}@pvv.ntnu.no.')
+        send_email(
+            f'{queue_position.username}@pvv.ntnu.no',
+            'Reminder - Your queue position expiry deadline is approaching',
+            dedent(f'''
+                Your queue position expiry deadline for the following item is approaching:
+                
+                {queue_position.item.name}
+                
+                Please borrow the item by {(queue_position.item_became_available_time + timedelta(days=day)).strftime("%a %b %d, %Y")}
+                ''',
+            ).strip(),
+        )
+    
+    
+    def _send_queue_position_expired_mail(self, queue_position: BookcaseItemBorrowingQueue):
+        send_email(
+            f'{queue_position.username}@pvv.ntnu.no',
+            'Your queue position has expired',
+            dedent(f'''
+                Your queue position for the following item has expired:
+                
+                {queue_position.item.name}
+                
+                You can queue for the item again at any time, but you will be placed at the back of the queue.
+
+                There are currently {len(queue_position.item.borrowing_queue)} users in the queue.
+                ''',
+            ).strip(),
+        )
+
+    ##################
+    # EMAIL ROUTINES #
+    ##################
 
     def _sql_subtract_date(self, x: datetime, y: timedelta):
         if self.sql_session.bind.dialect.name == 'sqlite':
@@ -48,10 +156,10 @@ class DeadlineDaemon:
 
 
     def send_close_deadline_reminder_mails(self):
-        logging.info('Sending mails about items with a closing deadline')
+        logging.info('Sending mails for items with a closing deadline')
 
         # TODO: This should be int-parsed and validated before the daemon started
-        days = [int(d) for d in Config['deadline_daemon.warn_days_before_borrow_deadline']]
+        days = [int(d) for d in Config['deadline_daemon.warn_days_before_borrowing_deadline']]
 
         for day in days:
             borrowings_to_remind = self.sql_session.scalars(
@@ -69,23 +177,11 @@ class DeadlineDaemon:
                 ),
             ).all()
             for borrowing in borrowings_to_remind:
-                logging.info(f'  Sending close deadline mail to {borrowing.username}@pvv.ntnu.no. {day} days left')
-                send_email(
-                    f'{borrowing.username}@pvv.ntnu.no',
-                    'Reminder - Your borrowing deadline is approaching',
-                    dedent(f'''
-                        Your borrowing deadline for the following item is approaching:
-                        
-                        {borrowing.item.name}
-                        
-                        Please return the item by {borrowing.end_time.strftime("%a %b %d, %Y")}
-                        ''',
-                    ).strip(),
-                )
+                self._send_close_deadline_mail(borrowing)
 
 
     def send_overdue_mails(self):
-        logging.info('Sending mails about overdue items')
+        logging.info('Sending mails for overdue items')
 
         to_remind = self.sql_session.scalars(
             select(BookcaseItemBorrowing)
@@ -96,19 +192,7 @@ class DeadlineDaemon:
         ).all()
 
         for borrowing in to_remind:
-            logging.info(f'  Sending overdue mail to {borrowing.username}@pvv.ntnu.no for {borrowing.item.isbn} - {borrowing.end_time.strftime("%a %b %d, %Y")}')
-            send_email(
-                f'{borrowing.username}@pvv.ntnu.no',
-                'Your deadline has passed',
-                dedent(f'''
-                    Your delivery deadline for the following item has passed:
-                    
-                    {borrowing.item.name}
-                    
-                    Please return the item as soon as possible.
-                    ''',
-                ).strip(),
-            )
+            self._send_overdue_mail(borrowing)
 
 
     def send_newly_available_mails(self):
@@ -133,15 +217,75 @@ class DeadlineDaemon:
         ).all()
 
         for queue_item in newly_available:
-            logging.info(f'Sending newly available mail to {queue_item.username}')
-            logging.warning('Not implemented')
+            logging.info(f'Adding user {queue_item.username} to queue for {queue_item.item.name}')
+            queue_item.item_became_available_time = self.current_run_datetime
+            self.sql_session.commit()
+
+            self._send_newly_available_mail(queue_item)
 
 
     def send_expiring_queue_position_mails(self):
         logging.info('Sending mails about queue positions which are expiring soon')
         logging.warning('Not implemented')
 
+        days = [int(d) for d in Config['deadline_daemon.warn_days_before_expiring_queue_position_deadline']]
+        for day in days:
+            queue_positions_to_remind = self.sql_session.scalars(
+                select(BookcaseItemBorrowingQueue)
+                .join(
+                    BookcaseItemBorrowing,
+                    BookcaseItemBorrowing.fk_bookcase_item_uid == BookcaseItemBorrowingQueue.fk_bookcase_item_uid,
+                )
+                .where(
+                    self._sql_subtract_date(
+                        BookcaseItemBorrowingQueue.item_became_available_time + timedelta(days=day),
+                        timedelta(days=day),
+                    )
+                    .between(
+                        self.last_run_datetime,
+                        self.current_run_datetime,
+                    ),
+                ),
+            ).all()
+
+            for queue_position in queue_positions_to_remind:
+                self._send_expiring_queue_position_mail(queue_position, day)
+
 
     def auto_expire_queue_positions(self):
         logging.info('Expiring queue positions which are too old')
-        logging.warning('Not implemented')
+
+        queue_position_expiry_days = int(Config['deadline_daemon.days_before_queue_position_expires'])
+
+        overdue_queue_positions = self.sql_session.scalars(
+            select(BookcaseItemBorrowingQueue)
+            .where(
+                BookcaseItemBorrowingQueue.item_became_available_time + timedelta(days=queue_position_expiry_days) < self.current_run_datetime,
+                BookcaseItemBorrowingQueue.expired.is_(False),
+            ),
+        ).all()
+
+        for queue_position in overdue_queue_positions:
+            logging.info(f'Expiring queue position for {queue_position.username} for item {queue_position.item.name}')
+
+            queue_position.expired = True
+
+            next_queue_position = self.sql_session.scalars(
+                select(BookcaseItemBorrowingQueue)
+                .where(
+                    BookcaseItemBorrowingQueue.fk_bookcase_item_uid == queue_position.fk_bookcase_item_uid,
+                    BookcaseItemBorrowingQueue.item_became_available_time.is_(None),
+                )
+                .order_by(BookcaseItemBorrowingQueue.entered_queue_time)
+                .limit(1),
+            ).one_or_none()
+
+            self._send_queue_position_expired_mail(queue_position)
+
+            if next_queue_position is not None:
+                next_queue_position.item_became_available_time = self.current_run_datetime
+
+                logging.info(f'Next user in queue for item {next_queue_position.item.name} is {next_queue_position.username}')
+                self._send_newly_available_mail(next_queue_position)
+
+            self.sql_session.commit()

worblehat/devscripts/seed_content_for_deadline_daemon.py

@@ -0,0 +1,117 @@
+from datetime import datetime, timedelta
+
+from worblehat.models import (
+  BookcaseItem,
+  BookcaseItemBorrowing,
+  BookcaseItemBorrowingQueue,
+  DeadlineDaemonLastRunDatetime,
+)
+
+from worblehat.services.config import Config
+
+from .seed_test_data import main as seed_test_data_main
+
+
+def clear_db(sql_session):
+  sql_session.query(BookcaseItemBorrowingQueue).delete()
+  sql_session.query(BookcaseItemBorrowing).delete()
+  sql_session.query(DeadlineDaemonLastRunDatetime).delete()
+  sql_session.commit()
+
+# NOTE: feel free to change this function to suit your needs
+#       it's just a quick and dirty way to get some data into the database
+#       for testing the deadline daemon - oysteikt 2024
+def main(sql_session):
+  borrow_warning_days = [timedelta(days=int(d)) for d in Config['deadline_daemon.warn_days_before_borrowing_deadline']]
+  queue_warning_days = [timedelta(days=int(d)) for d in Config['deadline_daemon.warn_days_before_expiring_queue_position_deadline']]
+  queue_expire_days = int(Config['deadline_daemon.days_before_queue_position_expires'])
+
+  clear_db(sql_session)
+  seed_test_data_main(sql_session)
+
+  books = sql_session.query(BookcaseItem).all()
+
+  last_run_datetime = datetime.now() - timedelta(days=16)
+  last_run = DeadlineDaemonLastRunDatetime(last_run_datetime)
+  sql_session.add(last_run)
+
+  # Create at least one item that is borrowed and not supposed to be returned yet
+  borrowing = BookcaseItemBorrowing(
+    item=books[0],
+    username='test_borrower_still_borrowing',
+  )
+  borrowing.start_time = last_run_datetime - timedelta(days=1)
+  borrowing.end_time = datetime.now() - timedelta(days=6)
+  sql_session.add(borrowing)
+
+  # Create at least one item that is borrowed and is supposed to be returned soon
+  borrowing = BookcaseItemBorrowing(
+    item=books[1],
+    username='test_borrower_return_soon',
+  )
+  borrowing.start_time = last_run_datetime - timedelta(days=1)
+  borrowing.end_time = datetime.now() - timedelta(days=2)
+  sql_session.add(borrowing)
+
+  # Create at least one item that is borrowed and is overdue
+  borrowing = BookcaseItemBorrowing(
+    item=books[2],
+    username='test_borrower_overdue',
+  )
+  borrowing.start_time = datetime.now() - timedelta(days=1)
+  borrowing.end_time = datetime.now() + timedelta(days=1)
+  sql_session.add(borrowing)
+
+  # Create at least one item that is in the queue and is not supposed to be borrowed yet
+  queue_item = BookcaseItemBorrowingQueue(
+    item=books[3],
+    username='test_queue_user_still_waiting',
+  )
+  queue_item.entered_queue_time = last_run_datetime - timedelta(days=1)
+  borrowing = BookcaseItemBorrowing(
+    item=books[3],
+    username='test_borrower_return_soon',
+  )
+  borrowing.start_time = last_run_datetime - timedelta(days=1)
+  borrowing.end_time = datetime.now() - timedelta(days=2)
+  sql_session.add(queue_item)
+  sql_session.add(borrowing)
+
+  # Create at least three items that is in the queue and two items were just returned
+  for i in range(3):
+    queue_item = BookcaseItemBorrowingQueue(
+      item=books[4 + i],
+      username=f'test_queue_user_{i}',
+    )
+    sql_session.add(queue_item)
+
+  for i in range(3):
+    borrowing = BookcaseItemBorrowing(
+      item=books[4 + i],
+      username=f'test_borrower_returned_{i}',
+    )
+    borrowing.start_time = last_run_datetime - timedelta(days=2)
+    borrowing.end_time = datetime.now() + timedelta(days=1)
+
+    if i != 2:
+      borrowing.delivered = datetime.now() - timedelta(days=1)
+
+    sql_session.add(borrowing)
+
+  # Create at least one item that has been in the queue for so long that the queue position should expire
+  queue_item = BookcaseItemBorrowingQueue(
+    item=books[7],
+    username='test_queue_user_expired',
+  )
+  queue_item.entered_queue_time = datetime.now() - timedelta(days=15)
+
+  # Create at least one item that has been in the queue for so long that the queue position should expire,
+  # but the queue person has already been notified
+  queue_item = BookcaseItemBorrowingQueue(
+    item=books[8],
+    username='test_queue_user_expired_notified',
+  )
+  queue_item.entered_queue_time = datetime.now() - timedelta(days=15)
+
+  sql_session.commit()
+

worblehat/devscripts/seed_test_data.py

@@ -0,0 +1,87 @@
+import csv
+
+from pathlib import Path
+from datetime import datetime, timedelta
+
+from worblehat.models import (
+  Bookcase,
+  BookcaseItem,
+  BookcaseShelf,
+  MediaType,
+  Language,
+)
+from worblehat.services.config import Config
+
+
+CSV_FILE = Path(__file__).parent.parent.parent / 'data' / 'arbeidsrom_smal_hylle_5.csv'
+
+def clear_db(sql_session):
+    sql_session.query(BookcaseItem).delete()
+    sql_session.query(BookcaseShelf).delete()
+    sql_session.query(Bookcase).delete()
+    sql_session.query(MediaType).delete()
+    sql_session.query(Language).delete()
+    sql_session.commit()
+
+def main(sql_session):
+    clear_db(sql_session)
+
+    media_type = MediaType(
+        name='Book',
+        description='A book',
+    )
+    sql_session.add(media_type)
+
+    language = Language(
+        name='Norwegian',
+        iso639_1_code='no',
+    )
+    sql_session.add(language)
+
+    seed_case = Bookcase(
+        name='seed_case',
+        description='test bookcase with test data',
+    )
+    sql_session.add(seed_case)
+
+    seed_shelf_1 = BookcaseShelf(
+      row=1,
+      column=1,
+      bookcase=seed_case,
+      description='test shelf with test data 1',
+    )
+    seed_shelf_2 = BookcaseShelf(
+      row=2,
+      column=1,
+      bookcase=seed_case,
+      description='test shelf with test data 2',
+    )
+    sql_session.add(seed_shelf_1)
+    sql_session.add(seed_shelf_2)
+
+    bookcase_items = []
+    with open(CSV_FILE) as csv_file:
+        csv_reader = csv.reader(csv_file, delimiter=',')
+
+        next(csv_reader)
+        for row in csv_reader:
+            item = BookcaseItem(
+                isbn=row[0],
+                name=row[1],
+            )
+            item.media_type = media_type
+            item.language = language
+            bookcase_items.append(item)
+
+    half = len(bookcase_items) // 2
+    first_half = bookcase_items[:half]
+    second_half = bookcase_items[half:]
+
+    for item in first_half:
+        item.bookcase_shelf = seed_shelf_1
+
+    for item in second_half:
+        item.bookcase_shelf = seed_shelf_2
+
+    sql_session.add_all(bookcase_items)
+    sql_session.commit()

worblehat/main.py

@@ -60,6 +60,19 @@ def main():
         WorblehatCli.run_with_safe_exit_wrapper(sql_session)
         exit(0)
 
+    if args.command == 'devscripts':
+        sql_session = _connect_to_database(echo=Config['logging.debug_sql'])
+        if args.script == 'seed-content-for-deadline-daemon':
+            from .devscripts.seed_content_for_deadline_daemon import main
+            main(sql_session)
+        elif args.script == 'seed-test-data':
+            from .devscripts.seed_test_data import main
+            main(sql_session)
+        else:
+            print(f'Error: no such script: {args.script}')
+            exit(1)
+        exit(0)
+
     if args.command == 'flask-dev':
         flask_dev_main()
         exit(0)

worblehat/models/BookcaseItem.py

@@ -2,10 +2,11 @@ from __future__ import annotations
 from typing import TYPE_CHECKING
 
 from sqlalchemy import (
+  ForeignKey,
   Integer,
   SmallInteger,
   String,
-  ForeignKey,
+  Text,
 )
 from sqlalchemy.orm import (
     Mapped,
@@ -31,8 +32,11 @@ if TYPE_CHECKING:
     from .Language import Language
     from .MediaType import MediaType
 
-class BookcaseItem(Base, UidMixin, UniqueNameMixin):
+from worblehat.flaskapp.database import db
+
+class BookcaseItem(Base, UidMixin):
     isbn: Mapped[int] = mapped_column(String, unique=True, index=True)
+    name: Mapped[str] = mapped_column(Text, index=True)
     owner: Mapped[str] = mapped_column(String, default='PVV')
     amount: Mapped[int] = mapped_column(SmallInteger, default=1)
 
@@ -63,4 +67,13 @@ class BookcaseItem(Base, UidMixin, UniqueNameMixin):
     ):
         self.name = name
         self.isbn = isbn
-        self.owner = owner
+        self.owner = owner
+
+    @classmethod
+    def get_by_isbn(cls, isbn: str, sql_session: Session = db.session) -> Self | None:
+        """
+        NOTE:
+        This method defaults to using the flask_sqlalchemy session.
+        It will not work outside of a request context, unless another session is provided.
+        """
+        return sql_session.query(cls).where(cls.isbn == isbn).one_or_none()

worblehat/models/BookcaseItemBorrowingQueue.py

@@ -21,7 +21,8 @@ if TYPE_CHECKING:
 
 class BookcaseItemBorrowingQueue(Base, UidMixin):
     username: Mapped[str] = mapped_column(String)
-    entered_queue_time = mapped_column(DateTime, default=datetime.now())
+    entered_queue_time: Mapped[datetime] = mapped_column(DateTime, default=datetime.now())
+    item_became_available_time: Mapped[datetime | None] = mapped_column(DateTime)
     expired = mapped_column(Boolean, default=False)
 
     fk_bookcase_item_uid: Mapped[int] = mapped_column(ForeignKey('BookcaseItem.uid'), index=True)

worblehat/models/DeadlineDaemonLastRunDatetime.py

@@ -20,4 +20,8 @@ class DeadlineDaemonLastRunDatetime(Base):
         ),
     )
     uid: Mapped[bool] = mapped_column(Boolean, primary_key=True, default=True)
-    time: Mapped[datetime] = mapped_column(DateTime, default=datetime.now())
+    time: Mapped[datetime] = mapped_column(DateTime, default=datetime.now())
+
+    def __init__(self, time: datetime | None = None):
+        if time is not None:
+            self.time = time

worblehat/services/argument_parser.py

@@ -31,6 +31,14 @@ subparsers.add_parser(
     help = 'Start the web interface in production mode',
 )
 
+subparsers.add_parser(
+    'devscripts',
+    help = 'Run development scripts',
+).add_argument(
+    'script',
+    help = 'The development script to run',
+)
+
 arg_parser.add_argument(
     '-V',
     '--version',

worblehat/services/config.py

@@ -24,6 +24,9 @@ class Config:
     ]
 
     def __class_getitem__(cls, name: str) -> Any:
+        if cls._config is None:
+            raise RuntimeError('Configuration not loaded, call Config.load_configuration() first.')
+
         __config = cls._config
         for attr in name.split('.'):
             __config = __config.get(attr)

worblehat/services/email.py

@@ -1,6 +1,7 @@
-from pathlib import Path
 import smtplib
 
+from textwrap import indent
+
 from email.mime.text import MIMEText
 from email.mime.multipart import MIMEMultipart
 
@@ -8,16 +9,16 @@ from .config import Config
 
 
 def send_email(to: str, subject: str, body: str):
-    if Config['smtp.enabled']:
-        msg = MIMEMultipart()
-        msg['From'] = Config['smtp.from']
-        msg['To'] = to
-        if Config['smtp.subject_prefix']:
-            msg['Subject'] = f"{Config['smtp.subject_prefix']} {subject}"
-        else:
-            msg['Subject'] = subject
-        msg.attach(MIMEText(body, 'plain'))
+    msg = MIMEMultipart()
+    msg['From'] = Config['smtp.from']
+    msg['To'] = to
+    if Config['smtp.subject_prefix']:
+        msg['Subject'] = f"{Config['smtp.subject_prefix']} {subject}"
+    else:
+        msg['Subject'] = subject
+    msg.attach(MIMEText(body, 'plain'))
 
+    if Config['smtp.enabled'] and not Config['deadline_daemon.dryrun']:
         try:
             with smtplib.SMTP(Config['smtp.host'], Config['smtp.port']) as server:
                 server.starttls()
@@ -31,6 +32,4 @@ def send_email(to: str, subject: str, body: str):
             print(err)
     else:
         print('Debug: Email sending is disabled, so the following email was not sent:')
-        print(f'  To: {to}')
-        print(f'  Subject: {subject}')
-        print(f'  Body: {body}')
+        print(indent(msg.as_string(), '  '))