Telltale: add check_entrypoint() to easily implement Icinga checker script

.pre-commit-config.yaml

@@ -12,7 +12,7 @@ repos:
     - id: black
       args: ['--target-version', 'py37', '--line-length', '100']
 -   repo: https://github.com/PyCQA/isort
-    rev: 5.11.4
+    rev: 5.11.5
     hooks:
     - id: isort
       args: ['--profile', 'black', '--line-length', '100']

mylib/__init__.py

@@ -62,3 +62,26 @@ def pretty_format_list(row, encoding="utf8", prefix=None):
             + pretty_format_value_in_list(values, encoding=encoding, prefix=prefix)
         )
     return "\n".join(result)
+
+
+def pretty_format_timedelta(timedelta):
+    """Format timedelta object"""
+    seconds = int(timedelta.total_seconds())
+    if seconds < 1:
+        return "less than one second"
+    periods = [
+        ("year", 60 * 60 * 24 * 365),
+        ("month", 60 * 60 * 24 * 30),
+        ("day", 60 * 60 * 24),
+        ("hour", 60 * 60),
+        ("minute", 60),
+        ("second", 1),
+    ]
+
+    strings = []
+    for period_name, period_seconds in periods:
+        if seconds >= period_seconds:
+            period_value, seconds = divmod(seconds, period_seconds)
+            strings.append(f'{period_value} {period_name}{"s" if period_value > 1 else ""}')
+
+    return ", ".join(strings)

mylib/scripts/helpers.py

@@ -37,11 +37,13 @@ def get_default_opt_value(config, default_config, key):
     return default_config.get(key)
 
 
-def get_opts_parser(desc=None, just_try=False, just_one=False, progress=False, config=None):
+def get_opts_parser(
+    desc=None, just_try=False, just_one=False, progress=False, config=None, **kwargs
+):
     """Retrieve options parser"""
-    default_config = dict(logfile=None)
+    default_config = {"logfile": None}
 
-    parser = argparse.ArgumentParser(description=desc)
+    parser = argparse.ArgumentParser(description=desc, **kwargs)
 
     parser.add_argument(
         "-v", "--verbose", action="store_true", dest="verbose", help="Enable verbose mode"
@@ -91,20 +93,20 @@ def add_email_opts(parser, config=None, **defaults):
     """Add email options"""
     email_opts = parser.add_argument_group("Email options")
 
-    default_config = dict(
-        smtp_host="127.0.0.1",
-        smtp_port=25,
-        smtp_ssl=False,
-        smtp_tls=False,
-        smtp_user=None,
-        smtp_password=None,
-        smtp_debug=False,
-        email_encoding=sys.getdefaultencoding(),
-        sender_name=getpass.getuser(),
-        sender_email=f"{getpass.getuser()}@{socket.gethostname()}",
-        catch_all=False,
-        templates_path=None,
-    )
+    default_config = {
+        "smtp_host": "127.0.0.1",
+        "smtp_port": 25,
+        "smtp_ssl": False,
+        "smtp_tls": False,
+        "smtp_user": None,
+        "smtp_password": None,
+        "smtp_debug": False,
+        "email_encoding": sys.getdefaultencoding(),
+        "sender_name": getpass.getuser(),
+        "sender_email": f"{getpass.getuser()}@{socket.gethostname()}",
+        "catch_all": False,
+        "templates_path": None,
+    }
     default_config.update(defaults)
 
     email_opts.add_argument(

mylib/scripts/telltale_check_test.py

@@ -0,0 +1,12 @@
+""" Test telltale file """
+import logging
+
+from mylib.scripts.telltale_test import default_filepath
+from mylib.telltale import TelltaleFile
+
+log = logging.getLogger(__name__)
+
+
+def main(argv=None):
+    """Script main"""
+    TelltaleFile.check_entrypoint(argv=argv, default_filepath=default_filepath)

mylib/scripts/telltale_test.py

@@ -0,0 +1,40 @@
+""" Test telltale file """
+import logging
+import os.path
+import sys
+import tempfile
+
+from mylib.scripts.helpers import get_opts_parser, init_logging
+from mylib.telltale import TelltaleFile
+
+log = logging.getLogger(__name__)
+
+default_filepath = os.path.join(tempfile.gettempdir(), f"{__name__}.last")
+
+
+def main(argv=None):
+    """Script main"""
+    if argv is None:
+        argv = sys.argv[1:]
+
+    # Options parser
+    parser = get_opts_parser()
+    options = parser.parse_args()
+
+    parser.add_argument(
+        "-p",
+        "--telltale-file-path",
+        action="store",
+        type=str,
+        dest="telltale_file_path",
+        help=f"Telltale file path (default: {default_filepath})",
+        default=default_filepath,
+    )
+
+    options = parser.parse_args()
+
+    # Initialize logs
+    init_logging(options, __doc__)
+
+    telltale_file = TelltaleFile(filepath=options.telltale_file_path)
+    telltale_file.update()

mylib/telltale.py

@@ -1,11 +1,19 @@
 """ Telltale files helpers """
 
+import argparse
 import datetime
 import logging
 import os
+import sys
+
+from mylib import pretty_format_timedelta
+from mylib.scripts.helpers import get_opts_parser, init_logging
 
 log = logging.getLogger(__name__)
 
+DEFAULT_WARNING_THRESHOLD = 90
+DEFAULT_CRITICAL_THRESHOLD = 240
+
 
 class TelltaleFile:
     """Telltale file helper class"""
@@ -50,3 +58,108 @@ class TelltaleFile:
             return True
         except FileNotFoundError:
             return True
+
+    @classmethod
+    def check_entrypoint(
+        cls,
+        argv=None,
+        description=None,
+        default_filepath=None,
+        default_warning_threshold=None,
+        default_critical_threshold=None,
+        fail_message=None,
+        success_message=None,
+    ):
+        """Entry point of the script to check a telltale file last update"""
+        argv = argv if argv else sys.argv
+        description = description if description else "Check last execution date"
+        parser = get_opts_parser(desc=description, exit_on_error=False)
+
+        parser.add_argument(
+            "-p",
+            "--telltale-file-path",
+            action="store",
+            type=str,
+            dest="telltale_file_path",
+            help=f"Telltale file path (default: {default_filepath})",
+            default=default_filepath,
+            required=not default_filepath,
+        )
+
+        default_warning_threshold = (
+            default_warning_threshold
+            if default_warning_threshold is not None
+            else DEFAULT_WARNING_THRESHOLD
+        )
+        default_critical_threshold = (
+            default_critical_threshold
+            if default_critical_threshold is not None
+            else DEFAULT_CRITICAL_THRESHOLD
+        )
+
+        parser.add_argument(
+            "-w",
+            "--warning",
+            type=int,
+            dest="warning",
+            help=(
+                "Specify warning threshold (in minutes, default: "
+                f"{default_warning_threshold} minutes)"
+            ),
+            default=default_warning_threshold,
+        )
+
+        parser.add_argument(
+            "-c",
+            "--critical",
+            type=int,
+            dest="critical",
+            help=(
+                "Specify critical threshold (in minutes, default: "
+                f"{default_critical_threshold} minutes)"
+            ),
+            default=default_critical_threshold,
+        )
+
+        try:
+            options = parser.parse_args(argv[1:])
+        except argparse.ArgumentError as err:
+            print(f"UNKNOWN - {err}")
+            sys.exit(3)
+
+        # Initialize logs
+        init_logging(options, argv[0])
+
+        telltale_file = cls(filepath=options.telltale_file_path)
+        last = telltale_file.last_update
+        if not last:
+            status = "UNKNOWN"
+            exit_code = 3
+            msg = (
+                fail_message
+                if fail_message
+                else "Fail to retrieve last successful date of execution"
+            )
+        else:
+            delay = datetime.datetime.now() - last
+            msg = (
+                success_message
+                if success_message
+                else "Last successful execution was {last_delay} ago ({last_date})"
+            ).format(
+                last_delay=pretty_format_timedelta(delay),
+                last_date=last.strftime("%Y/%m/%d %H:%M:%S"),
+            )
+
+            if delay >= datetime.timedelta(minutes=options.critical):
+                status = "CRITICAL"
+                exit_code = 2
+            elif delay >= datetime.timedelta(minutes=options.warning):
+                status = "WARNING"
+                exit_code = 1
+            else:
+                status = "OK"
+                exit_code = 0
+
+        print(f"{status} - {msg}")
+        sys.exit(exit_code)

setup.py

@@ -69,6 +69,8 @@ setup(
             "mylib-test-report = mylib.scripts.report_test:main",
             "mylib-test-ldap = mylib.scripts.ldap_test:main",
             "mylib-test-sftp = mylib.scripts.sftp_test:main",
+            "mylib-test-telltale = mylib.scripts.telltale_test:main",
+            "mylib-test-telltale-check = mylib.scripts.telltale_check_test:main",
         ],
     },
 )