add telegram message notification support

README.md

@@ -20,8 +20,8 @@ status [-v --verbose] [-m --max <number>]
     print details of a previously successful upgrade
 reset
     reset the current failure status
-test-smtp
+test-mail
-    send an test email to the configured address
+    send test mails to all configured notification destinations
 ```
 There is also a systemd timer for scheduled automatic upgrades.
 
@@ -47,8 +47,13 @@ Pacroller wipes /var/cache/pacman/pkg after a successful upgrade if the option "
 ### save pacman output
 Every time an upgrade is performed, the pacman output is stored into /var/log/pacroller. This can be configured via the "save_stdout" keyword.
 
-## Smtp
+## Notification
-Configure `/etc/pacroller/smtp.json` to receive an email notification when an upgrade fails. Note that pacroller will not send any email if stdin is a tty (can be overridden by the `--interactive` switch).
+When configuring your notification system, please note that pacroller will not send any notification if stdin is a tty (can be overridden by the `--interactive` switch).
+Notification will be sent through all configured methods when it requires manual inspection. Currently, two notification methods are supported: SMTP and telegram
+### SMTP
+Configure `/etc/pacroller/smtp.json` to receive email notifications.
+### Telegram
+Configure `/etc/pacroller/telegram.json` to receive telegram notifications.
 
 ## Limitations
 - Your favourite package may not be supported, however it's easy to add another set of rules.

src/pacroller/config.py

@@ -8,6 +8,7 @@ from typing import Any
 CONFIG_DIR = Path('/etc/pacroller')
 CONFIG_FILE = 'config.json'
 CONFIG_FILE_SMTP = 'smtp.json'
+CONFIG_FILE_TG = 'telegram.json'
 F_KNOWN_OUTPUT_OVERRIDE = 'known_output_override.py'
 LIB_DIR = Path('/var/lib/pacroller')
 DB_FILE = 'db'
@@ -34,6 +35,16 @@ if (smtp_cfg := (CONFIG_DIR / CONFIG_FILE_SMTP)).exists():
 else:
     _smtp_config = dict()
 
+if (tg_cfg := (CONFIG_DIR / CONFIG_FILE_TG)).exists():
+    try:
+        _tg_cfg_text = tg_cfg.read_text()
+    except PermissionError:
+        _tg_config = dict()
+    else:
+        _tg_config: dict = json.loads(_tg_cfg_text)
+else:
+    _tg_config = dict()
+
 def _import_module(fpath: Path) -> Any:
     spec = importlib.util.spec_from_file_location(str(fpath).removesuffix('.py').replace('/', '.'), fpath)
     mod = importlib.util.module_from_spec(spec)
@@ -98,3 +109,8 @@ if SMTP_ENABLED:
             SMTP_AUTH.pop('password_base64')
         assert SMTP_AUTH['password']
         SMTP_AUTH = {k:v for k, v in SMTP_AUTH.items() if k in {'username', 'password'}}
+
+TG_ENABLED = bool(_tg_config.get('enabled', False))
+TG_BOT_TOKEN = _tg_config.get('bot_token', "")
+TG_API_HOST = _tg_config.get('api_host', 'api.telegram.org')
+TG_RECIPIENT = _tg_config.get('recipient', "")

src/pacroller/mailer.py

@@ -1,40 +1,32 @@
+import json
 import smtplib
 from email.message import EmailMessage
 from typing import List
 import logging
+import urllib.request, urllib.parse
 from platform import node
-from pacroller.config import NETWORK_RETRY, SMTP_ENABLED, SMTP_SSL, SMTP_HOST, SMTP_PORT, SMTP_FROM, SMTP_TO, SMTP_AUTH
+from pacroller.config import NETWORK_RETRY, SMTP_ENABLED, SMTP_SSL, SMTP_HOST, SMTP_PORT, SMTP_FROM, SMTP_TO, SMTP_AUTH, TG_ENABLED, TG_BOT_TOKEN, TG_API_HOST, TG_RECIPIENT
 
 logger = logging.getLogger()
 hostname = node() or "unknown-host"
 
-class MailSender:
+
-    def __init__(self) -> None:
+def send_email(text: str, subject: str, mailto: List[str]) -> bool:
-        self.host = SMTP_HOST
-        self.port = SMTP_PORT
-        self.ssl = SMTP_SSL
-        self.auth = SMTP_AUTH
-        self.mailfrom = SMTP_FROM
-        self.mailto = SMTP_TO.split()
-        self.smtp_cls = smtplib.SMTP_SSL if self.ssl else smtplib.SMTP
-    def send_text_plain(self, text: str, subject: str = f"pacroller on {hostname}", mailto: List[str] = list()) -> bool:
-        if not SMTP_ENABLED:
-            return None
     for _ in range(NETWORK_RETRY):
         try:
-                server = self.smtp_cls(self.host, self.port)
+            smtp_cls = smtplib.SMTP_SSL if SMTP_SSL else smtplib.SMTP
-                if self.auth:
+            server = smtp_cls(SMTP_HOST, SMTP_PORT)
-                    server.login(self.auth["username"], self.auth["password"])
+            if SMTP_AUTH:
-                mailto = mailto if mailto else self.mailto
+                server.login(SMTP_AUTH["username"], SMTP_AUTH["password"])
             msg = EmailMessage()
             msg.set_content(f"from pacroller running on {hostname=}:\n\n{text}")
             msg['Subject'] = subject
-                msg['From'] = self.mailfrom
+            msg['From'] = SMTP_FROM
             msg['To'] = ', '.join(mailto)
             server.send_message(msg)
             server.quit()
         except Exception:
-                logger.exception("error while smtp send_message")
+            logger.exception("error while send_email")
         else:
             logger.debug(f"smtp sent {text=}")
             break
@@ -43,6 +35,48 @@ class MailSender:
         return False
     return True
 
+
+def send_tg_message(text: str, subject: str, mailto: List[str]) -> bool:
+    for _ in range(NETWORK_RETRY):
+        all_succeeded = True
+        try:
+            for recipient in mailto:
+                url = f'https://{TG_API_HOST}/bot{TG_BOT_TOKEN}/sendMessage'
+                headers = {'User-Agent': 'Mozilla/5.0 (compatible; Pacroller/0.1; +https://github.com/isjerryxiao/pacroller)'}
+                data = urllib.parse.urlencode({"chat_id": recipient, "text": f"<b>{subject}</b>\n\n<code>{text}</code>", "parse_mode": "HTML"})
+                req = urllib.request.Request(url, data=data.encode(), headers=headers)
+                resp = urllib.request.urlopen(req).read().decode('utf-8')
+                content = json.loads(resp)
+                if not content["ok"]:
+                    all_succeeded = False
+                    logger.error(f"unable to send telegram message to {recipient}: %s" % content['description'])
+        except Exception:
+            logger.exception("error while send_tg_message")
+        else:
+            logger.debug(f"telegram message sent {text=}")
+            break
+    else:
+        logger.error(f"unable to send telegram message after {NETWORK_RETRY} attempts {text=}")
+        return False
+    return all_succeeded
+
+
+class MailSender:
+    def __init__(self) -> None:
+        pass
+    def send_text_plain(elsf, text: str, subject: str = f"pacroller on {hostname}") -> bool:
+        if_failed = False
+        if SMTP_ENABLED:
+            if not send_email(text, subject, SMTP_TO.split()):
+                if_failed = True
+        if TG_ENABLED:
+            if not send_tg_message(text, subject, TG_RECIPIENT.split()):
+                if_failed = True
+        if not SMTP_ENABLED and not TG_ENABLED:
+            return None
+        return not if_failed
+
+
 if __name__ == "__main__":
     logging.basicConfig(level=logging.DEBUG, format='%(asctime)s - %(module)s - %(funcName)s - %(levelname)s - %(message)s')
-    MailSender().send_text_plain("This is a test mail\nIf you see this email, your smtp config is working.")
+    MailSender().send_text_plain("This is a test mail\nIf you see this mail, your notification config is working.")

src/pacroller/main.py

@@ -288,8 +288,8 @@ def main() -> None:
             logger.debug(f'needrestart {p.stdout=}')
     import argparse
     parser = argparse.ArgumentParser(description='Unattended Upgrades for Arch Linux')
-    parser.add_argument('action', choices=['run', 'status', 'reset', 'fail-reset', 'reset-failed', 'test-smtp'],
+    parser.add_argument('action', choices=['run', 'status', 'reset', 'fail-reset', 'reset-failed', 'test-mail'],
-                        help="what to do", metavar="run / status / reset / test-smtp")
+                        help="what to do", metavar="run / status / reset / test-mail")
     parser.add_argument('-d', '--debug', action='store_true', help='enable debug mode')
     parser.add_argument('-v', '--verbose', action='store_true', help='show verbose report')
     parser.add_argument('-m', '--max', type=int, default=1, help='Number of upgrades to show')
@@ -361,12 +361,12 @@ def main() -> None:
             if PACMAN_SCC:
                 clear_pkg_cache()
 
-    elif args.action == 'test-smtp':
+    elif args.action == 'test-mail':
         logger.info('sending test mail...')
-        if _smtp_result := MailSender().send_text_plain("This is a test mail\nIf you see this email, your smtp config is working."):
+        if _notification_result := MailSender().send_text_plain("This is a test mail\nIf you see this mail, your notification config is working."):
             logger.info("success")
-        elif _smtp_result is None:
+        elif _notification_result is None:
-            logger.warning("smtp is disabled")
+            logger.warning("no notification method is enabled")
         else:
             logger.error("fail")
 

src/pacroller/telegram.json

@@ -0,0 +1,6 @@
+{
+    "enabled": false,
+    "recipient": "",
+    "api_host": "api.telegram.org",
+    "bot_token": ""
+}