updated dependencies and removed mypy

* Code-correctness has not been veriefied yet.

flake.lock

@@ -1,24 +1,138 @@
 {
   "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nix-github-actions": {
+      "inputs": {
+        "nixpkgs": [
+          "poetry2nix-lib",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1703863825,
+        "narHash": "sha256-rXwqjtwiGKJheXB43ybM8NwWB8rO2dSRrEqes0S7F5Y=",
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "rev": "5163432afc817cf8bd1f031418d1869e4c9d5547",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1692025715,
-        "narHash": "sha256-tsRiiopGT7HA8d/cuk5xYBRXgdnnvD+JhUGUe3x7vmY=",
+        "lastModified": 1716330097,
+        "narHash": "sha256-8BO3B7e3BiyIDsaKA0tY8O88rClYRTjvAp66y+VBUeU=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "09a137528c3aea3780720d19f99cd706f52c3823",
+        "rev": "5710852ba686cc1fd0d3b8e22b3117d43ba374c2",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
-        "ref": "nixos-23.05",
+        "ref": "nixos-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }
     },
+    "poetry2nix-lib": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nix-github-actions": "nix-github-actions",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "systems": "systems_2",
+        "treefmt-nix": "treefmt-nix"
+      },
+      "locked": {
+        "lastModified": 1715251496,
+        "narHash": "sha256-vRBfJCKvJtu5sYev56XStirA3lAOPv0EkoEV2Nfc+tc=",
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "rev": "291a863e866972f356967d0a270b259f46bf987f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "poetry2nix-lib": "poetry2nix-lib"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "id": "systems",
+        "type": "indirect"
+      }
+    },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "poetry2nix-lib",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1714058656,
+        "narHash": "sha256-Qv4RBm4LKuO4fNOfx9wl40W2rBbv5u5m+whxRYUMiaA=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "c6aaf729f34a36c445618580a9f95a48f5e4e03f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
       }
     }
   },

flake.nix

@@ -2,43 +2,45 @@
   description = "A very basic flake";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-23.05";
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    poetry2nix-lib = {
+      url = "github:nix-community/poetry2nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
   outputs = {
     self,
     nixpkgs,
+    poetry2nix-lib,
   } @ inputs: let
     supportedSystems = ["x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"];
     forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
     pkgs = forAllSystems (system: nixpkgs.legacyPackages.${system});
+    poetry2nix = forAllSystems (system: poetry2nix-lib.lib.mkPoetry2Nix {pkgs = pkgs.${system};});
   in {
-    # Formatter
-    formatter = forAllSystems (system: nixpkgs.legacyPackages.${system}.alejandra);
-
-    # Packages
+    # `nix build`
     packages = forAllSystems (system: {
-      default = pkgs.${system}.poetry2nix.mkPoetryApplication {projectDir = self;};
+      default = poetry2nix.${system}.mkPoetryApplication {
+        projectDir = self;
+      };
     });
 
-    # Dev Shell
+    # `nix fmt`
+    formatter = forAllSystems (system: pkgs.${system}.alejandra);
+
+    # `nix develop`
     devShells = forAllSystems (system: {
-      default = pkgs.${system}.mkShellNoCC {
-        packages = with pkgs.${system}; [
-          (poetry2nix.mkPoetryEnv {projectDir = self;})
-          poetry
-          mypy
-          python310Packages.types-requests
-        ];
-      };
-    });
-
-    # Run as apps
-    apps = forAllSystems (system: {
-      default = {
-        program = "${self.packages.${system}.default}/bin/outage_detector";
-        type = "app";
-      };
+      default = let
+        poetryEnv = poetry2nix.${system}.mkPoetryEnv {projectDir = self;};
+      in
+        pkgs.${system}.mkShellNoCC {
+          packages = with pkgs.${system};
+            [
+              poetry
+            ]
+            ++ [poetryEnv];
+        };
     });
 
     # TODO: Home Manager Module

nix/module.nix

@@ -14,31 +14,27 @@ in {
 
     timer = lib.mkOption {
       type = types.nullOr types.int;
+
       default = null;
+
       description = lib.mdDoc ''
         The time intervall in seconds the script should be repeated.
       '';
     };
 
     settings = mkOption {
-      type = with types; let
-        valueType = nullOr (oneOf [
-          # TODO: restrict type to actual config file structure
-          bool
-          int
-          float
-          str
-          path
-          (attrsOf valueType)
-          (listOf valueType)
-        ]);
-      in
-        valueType;
-      default = {
-        filename = throw "Please specify outage-detector.settings.";
-        host = "1.1.1.1";
-        timeout = 2;
-      };
+      type = with types; attrsOf (either str int);
+
+      description = lib.mdDoc ''
+        The settings for the outage-detector script.
+
+        Example:
+        {
+          logFile = "/home/user/outage-detector.log";
+          host = "1.1.1.1";
+          timeout = 2;
+        };
+      '';
     };
   };
 
@@ -47,7 +43,7 @@ in {
 
     systemd.services.outage-detector = mkIf (cfg.timer
       != null) {
-      script = "${package}/bin/outage_detector log ${cfg.settings.filename} --host ${cfg.settings.host} --timeout ${cfg.settings.timeout}";
+      script = "${package}/bin/outage-detector log ${cfg.settings.logFile} --host ${cfg.settings.host} --timeout ${toString cfg.settings.timeout}";
 
       serviceConfig = {
         Type = "oneshot";

outage_detector/main.py

@@ -1,136 +0,0 @@
-import sys
-import argparse
-from datetime import datetime
-
-import requests
-
-
-class LogEntry:
-    """Class describing a connection attempt"""
-
-    def __init__(self: 'LogEntry', log_entry: str) -> None:
-        self.date = datetime.strptime(log_entry[1:20], '%Y-%m-%d %H:%M:%S')
-        self.host = log_entry.split('[')[2].split(']')[0]
-        self.failed = 'FAIL' in log_entry
-
-
-def printOutages(filepath: str, time: int) -> None:
-    """Print outages from a log file"""
-
-    with open(filepath, 'r') as file:
-        log = list(map(lambda x: LogEntry(x), file.readlines()))
-
-    # cluster log entries by host
-    log_by_host = {}
-    for entry in log:
-        if entry.host not in log_by_host:
-            log_by_host[entry.host] = [entry]
-        else:
-            log_by_host[entry.host].append(entry)
-
-    # cluster fails to outages
-    # we consider the time of subsequent failed connection attempts to the same host an outage
-    outages: list = []
-    last_failed = False
-    for entries in log_by_host.values():
-        for entry in entries:
-            if entry.failed and last_failed:
-                outages[-1].append(entry)
-            if entry.failed and not last_failed:
-                outages.append([entry])
-                last_failed = True
-            if not entry.failed and last_failed:
-                last_failed = False
-
-    # print the outages by date of first fail
-    for outage in sorted(outages, key=lambda x: x[0].date):
-
-        # get duration of outage in hours and minutes
-        outage_duration = round(
-            (outage[-1].date - outage[0].date).seconds / 60)
-        # continue if outage is shorter than the minimum duration
-        if outage_duration < time:
-            continue
-        hours = outage_duration // 60
-        minutes = outage_duration - (hours * 60)
-        host = outage[0].host
-
-        # Outputs outages in the form of "Outage at: 2023-19-01 06:29:01 lasting for 2 Hours and 39 Minutes"
-        print(f"[{outage[0].date}][{host}] lasting for {'{} Hours and '.format(hours) if hours >= 1 else ''}{minutes} Minutes")
-
-
-def isOnline(host: str, timeout: int) -> bool:
-    """Check if connection to a host can be established"""
-
-    try:
-        requests.head(f"https://{host}", timeout=timeout)
-        return True
-    except requests.ConnectionError:
-        return False
-
-
-def log(host: str, timeout: int, filepath: None | str = None) -> None:
-    """Log the connection status of a host"""
-
-    logline = f"[{datetime.now().strftime('%Y-%m-%d %H:%M:%S')}][{host}][{'OK' if isOnline(host, timeout) else 'FAIL'}]"
-
-    if filepath is not None:
-        with open(filepath, 'a') as file:
-            file.write(logline + '\n')
-    else:
-        print(logline)
-
-
-def parseArgs(args: list[str]) -> argparse.Namespace:
-
-    parser = argparse.ArgumentParser(
-        prog='outage_detector', description='Log outages and print statistics.'
-    )
-
-    subparsers = parser.add_subparsers(dest='command')
-
-    # Arguments for the log command
-    parser_log = subparsers.add_parser(
-        'log', help='Log the connection status.'
-    )
-    parser_log.add_argument(
-        'filename', type=str, default=None, nargs='?',
-        help='Path to a the file where results should be appended to. Creates the file if it does not exist. If not specified, results are printed to stdout.'
-    )
-    parser_log.add_argument(
-        '--host', type=str, default='1.1.1.1',
-        help='IP or hostname of a server to query. (default: %(default)s)'
-    )
-    parser_log.add_argument(
-        '--timeout', type=int, default=2,
-        help='Set the timeout in seconds to use for the connection test. (default: %(default)s)'
-    )
-
-    # Arguments for the outages command
-    parser_outages = subparsers.add_parser(
-        'outages', help='Print/log outages'
-    )
-    parser_outages.add_argument(
-        'filename', type=str, nargs='?',
-        help='Path to a file with connection logs.'
-    )
-    parser_outages.add_argument(
-        '--time', type=int, default=3,
-        help='Minimum duration for a connection loss to be considered an outage. (default: %(default)s)'
-    )
-
-    return parser.parse_args(args)
-
-
-def main():
-
-    args = parseArgs(sys.argv[1:])
-
-    if args.command == 'log':
-        log(args.host, args.timeout, args.filename)
-    elif args.command == 'outages':
-        printOutages(args.filename, args.time)
-
-
-if __name__ == '__main__':
-    main()

poetry.lock

@@ -1,154 +1,179 @@
-# This file is automatically @generated by Poetry 1.4.2 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
 
 [[package]]
 name = "certifi"
-version = "2023.7.22"
+version = "2024.2.2"
 description = "Python package for providing Mozilla's CA Bundle."
-category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
-    {file = "certifi-2023.7.22-py3-none-any.whl", hash = "sha256:92d6037539857d8206b8f6ae472e8b77db8058fec5937a1ef3f54304089edbb9"},
-    {file = "certifi-2023.7.22.tar.gz", hash = "sha256:539cc1d13202e33ca466e88b2807e29f4c13049d6d87031a3c110744495cb082"},
+    {file = "certifi-2024.2.2-py3-none-any.whl", hash = "sha256:dc383c07b76109f368f6106eee2b593b04a011ea4d55f652c6ca24a754d1cdd1"},
+    {file = "certifi-2024.2.2.tar.gz", hash = "sha256:0569859f95fc761b18b45ef421b1290a0f65f147e92a1e5eb3e635f9a5e4e66f"},
 ]
 
 [[package]]
 name = "charset-normalizer"
-version = "3.2.0"
+version = "3.3.2"
 description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
-category = "main"
 optional = false
 python-versions = ">=3.7.0"
 files = [
-    {file = "charset-normalizer-3.2.0.tar.gz", hash = "sha256:3bb3d25a8e6c0aedd251753a79ae98a093c7e7b471faa3aa9a93a81431987ace"},
-    {file = "charset_normalizer-3.2.0-cp310-cp310-macosx_10_9_universal2.whl", hash = "sha256:0b87549028f680ca955556e3bd57013ab47474c3124dc069faa0b6545b6c9710"},
-    {file = "charset_normalizer-3.2.0-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:7c70087bfee18a42b4040bb9ec1ca15a08242cf5867c58726530bdf3945672ed"},
-    {file = "charset_normalizer-3.2.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:a103b3a7069b62f5d4890ae1b8f0597618f628b286b03d4bc9195230b154bfa9"},
-    {file = "charset_normalizer-3.2.0-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:94aea8eff76ee6d1cdacb07dd2123a68283cb5569e0250feab1240058f53b623"},
-    {file = "charset_normalizer-3.2.0-cp310-cp310-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl", hash = "sha256:db901e2ac34c931d73054d9797383d0f8009991e723dab15109740a63e7f902a"},
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+    {file = "charset_normalizer-3.3.2-py3-none-any.whl", hash = "sha256:3e4d1f6587322d2788836a99c69062fbb091331ec940e02d12d179c1d53e25fc"},
 ]
 
 [[package]]
 name = "idna"
-version = "3.4"
+version = "3.7"
 description = "Internationalized Domain Names in Applications (IDNA)"
-category = "main"
 optional = false
 python-versions = ">=3.5"
 files = [
-    {file = "idna-3.4-py3-none-any.whl", hash = "sha256:90b77e79eaa3eba6de819a0c442c0b4ceefc341a7a2ab77d7562bf49f425c5c2"},
-    {file = "idna-3.4.tar.gz", hash = "sha256:814f528e8dead7d329833b91c5faa87d60bf71824cd12a7530b5526063d02cb4"},
+    {file = "idna-3.7-py3-none-any.whl", hash = "sha256:82fee1fc78add43492d3a1898bfa6d8a904cc97d8427f683ed8e798d07761aa0"},
+    {file = "idna-3.7.tar.gz", hash = "sha256:028ff3aadf0609c1fd278d8ea3089299412a7a8b9bd005dd08b9f8285bcb5cfc"},
 ]
 
 [[package]]
 name = "requests"
-version = "2.29.0"
+version = "2.32.2"
 description = "Python HTTP for Humans."
-category = "main"
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.8"
 files = [
-    {file = "requests-2.29.0-py3-none-any.whl", hash = "sha256:e8f3c9be120d3333921d213eef078af392fba3933ab7ed2d1cba3b56f2568c3b"},
-    {file = "requests-2.29.0.tar.gz", hash = "sha256:f2e34a75f4749019bb0e3effb66683630e4ffeaf75819fb51bebef1bf5aef059"},
+    {file = "requests-2.32.2-py3-none-any.whl", hash = "sha256:fc06670dd0ed212426dfeb94fc1b983d917c4f9847c863f313c9dfaaffb7c23c"},
+    {file = "requests-2.32.2.tar.gz", hash = "sha256:dd951ff5ecf3e3b3aa26b40703ba77495dab41da839ae72ef3c8e5d8e2433289"},
 ]
 
 [package.dependencies]
 certifi = ">=2017.4.17"
 charset-normalizer = ">=2,<4"
 idna = ">=2.5,<4"
-urllib3 = ">=1.21.1,<1.27"
+urllib3 = ">=1.21.1,<3"
 
 [package.extras]
 socks = ["PySocks (>=1.5.6,!=1.5.7)"]
 use-chardet-on-py3 = ["chardet (>=3.0.2,<6)"]
 
 [[package]]
-name = "urllib3"
-version = "1.26.16"
-description = "HTTP library with thread-safe connection pooling, file post, and more."
-category = "main"
+name = "types-requests"
+version = "2.32.0.20240523"
+description = "Typing stubs for requests"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
+python-versions = ">=3.8"
 files = [
-    {file = "urllib3-1.26.16-py2.py3-none-any.whl", hash = "sha256:8d36afa7616d8ab714608411b4a3b13e58f463aee519024578e062e141dce20f"},
-    {file = "urllib3-1.26.16.tar.gz", hash = "sha256:8f135f6502756bde6b2a9b28989df5fbe87c9970cecaa69041edcce7f0589b14"},
+    {file = "types-requests-2.32.0.20240523.tar.gz", hash = "sha256:26b8a6de32d9f561192b9942b41c0ab2d8010df5677ca8aa146289d11d505f57"},
+    {file = "types_requests-2.32.0.20240523-py3-none-any.whl", hash = "sha256:f19ed0e2daa74302069bbbbf9e82902854ffa780bc790742a810a9aaa52f65ec"},
+]
+
+[package.dependencies]
+urllib3 = ">=2"
+
+[[package]]
+name = "urllib3"
+version = "2.2.1"
+description = "HTTP library with thread-safe connection pooling, file post, and more."
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "urllib3-2.2.1-py3-none-any.whl", hash = "sha256:450b20ec296a467077128bff42b73080516e71b56ff59a60a02bef2232c4fa9d"},
+    {file = "urllib3-2.2.1.tar.gz", hash = "sha256:d0570876c61ab9e520d776c38acbbb5b05a776d3f9ff98a5c8fd5162a444cf19"},
 ]
 
 [package.extras]
-brotli = ["brotli (>=1.0.9)", "brotlicffi (>=0.8.0)", "brotlipy (>=0.6.0)"]
-secure = ["certifi", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "ipaddress", "pyOpenSSL (>=0.14)", "urllib3-secure-extra"]
-socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
+brotli = ["brotli (>=1.0.9)", "brotlicffi (>=0.8.0)"]
+h2 = ["h2 (>=4,<5)"]
+socks = ["pysocks (>=1.5.6,!=1.5.7,<2.0)"]
+zstd = ["zstandard (>=0.18.0)"]
 
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.10"
-content-hash = "ee132bd4e431294d08ddbc6bd9a59272e394e2a275ec7982d40592401aa07350"
+content-hash = "0c18c1520626bc79b003d201df4a1688af4e3cfc4805627505de0ff569c9102b"

pyproject.toml

@@ -4,14 +4,17 @@ version = "0.1.0"
 description = ""
 authors = ["Kristian Krsnik <git@krsnik.at>"]
 readme = "README.md"
-packages = [{ include = "outage_detector" }]
+packages = [{ include = "src" }]
 
 [tool.poetry.dependencies]
 python = "^3.10"
-requests = "2.29.0"
+requests = "^2.29.0"
 
 [tool.poetry.scripts]
-outage_detector = "outage_detector.main:main"
+outage-detector = "src.main:main"
+
+[tool.poetry.group.dev.dependencies]
+types-requests = "^2.31.0.20231231"
 
 [build-system]
 requires = ["poetry-core"]

src/main.py

@@ -0,0 +1,211 @@
+import sys
+import argparse
+from datetime import datetime, timedelta
+
+import requests
+
+
+class LogEntry:
+    '''Class describing a connection attempt.'''
+
+    def __init__(self: 'LogEntry', log_entry: str) -> None:
+        self.date = datetime.strptime(log_entry[1:20], '%Y-%m-%d %H:%M:%S')
+        self.host = log_entry.split('[')[2].split(']')[0]
+        self.failed = 'FAIL' in log_entry
+
+    def __repr__(self: 'LogEntry') -> str:
+        return f"[{self.date}][{self.host}][{'OK' if not self.failed else 'FAIL'}]"
+
+
+class Outage:
+    '''
+        Class describing an outage.
+
+        `self.start` The start of the outage represented by a LogEntry object.
+
+        `self.end` The end of an outage represented by a LogEntry object.
+        Could be None to represent that the outage is still ongoing.
+    '''
+
+    def __init__(self, start: LogEntry, end: None | LogEntry = None) -> None:
+        '''
+            Initialize an outage.
+
+            `start` The start of an outage represented by a LogEntry object.
+
+            `end` The end of an outage represented by a LogEntry object.
+            By default it is none to represent an ongoing outage.
+        '''
+
+        self.start = start
+        self.end = end
+
+    def duration(self) -> timedelta:
+        '''
+            Return the duration of the outage as datetime object.
+            If the outage does not have an end, the time from the start to now will be returned.
+        '''
+
+        if self.end is None:
+            return datetime.now() - self.start.date
+        else:
+            return self.end.date - self.start.date
+
+
+def printOutages(filepath: str, time: int) -> None:
+    '''
+        Print outages from a log file
+
+        `filepath` Path to a file with connection logs.
+
+        `time` Minimum duration for a connection loss to be considered an outage.
+    '''
+
+    # Get a sorted list of log entries.
+    with open(filepath, 'r') as file:
+        log = sorted(
+            map(lambda x: LogEntry(x), file.readlines()),
+            key=lambda x: x.date
+        )
+
+    # Cluster log entries by host.
+    log_by_host = {}
+
+    for entry in log:
+        if entry.host not in log_by_host:
+            log_by_host[entry.host] = [entry]
+        else:
+            log_by_host[entry.host].append(entry)
+
+    # Cluster fails to outages.
+    # We consider the time of subsequent failed connection attempts to the same host an outage.
+    outages: list = []
+    last_failed = False
+
+    for _, entries in sorted(log_by_host.items()):  # sort by hostname
+
+        for entry in entries:
+
+            # Start a new outage.
+            if entry.failed and not last_failed:
+                outages.append(Outage(entry))
+                last_failed = True
+
+            # End an outage.
+            elif not entry.failed and last_failed:
+                outages[-1].end = entry
+                last_failed = False
+
+    # Print the outages.
+    for outage in outages:
+
+        # Get duration of outage in hours and minutes.
+        outage_duration = round(outage.duration().seconds / 60)
+
+        # Skip printing if outage is shorter than the minimum duration.
+        if outage_duration < time:
+            continue
+
+        # Get hours and minutes for printing.
+        hours = outage_duration // 60
+        minutes = outage_duration - (hours * 60)
+        host = outage.start.host
+
+        # Outputs outages in the form of "Outage at: 2023-19-01 06:29:01 lasting for 2 Hours and 39 Minutes".
+        print(f"[{outage.start.date}][{host}] lasting for {'{} Hours and '.format(hours) if hours >= 1 else ''}{minutes} Minutes")
+
+
+def isOnline(host: str, timeout: int) -> bool:
+    '''
+        Check if connection to a host can be established.
+
+        `host` IP or hostname of a server to query.
+
+        `timeout` Set the timeout in seconds to use for the connection test.
+    '''
+
+    try:
+        requests.head(f"https://{host}", timeout=timeout)
+        return True
+    except requests.ConnectionError:
+        return False
+
+
+def log(host: str, timeout: int, filepath: None | str = None) -> None:
+    '''
+        Log the connection status of a host.
+
+        `host` IP or hostname of a server to query.
+
+        `timeout` Set the timeout in seconds to use for the connection test.
+
+        `filepath` Path to a the file where results should be appended to. Creates the file if it does not exist. If not specified, results are printed to stdout.
+    '''
+
+    logline = f"[{datetime.now().strftime('%Y-%m-%d %H:%M:%S')}][{host}][{'OK' if isOnline(host, timeout) else 'FAIL'}]"
+
+    if filepath is not None:
+        with open(filepath, 'a') as file:
+            file.write(logline + '\n')
+    else:
+        print(logline)
+
+
+def parseArgs(args: list[str]) -> argparse.Namespace:
+    '''
+        Parse command line arguments.
+
+        `args` List of user-supplied command line arguments.
+    '''
+
+    parser = argparse.ArgumentParser(
+        prog='outage_detector', description='Log outages and print statistics.'
+    )
+
+    subparsers = parser.add_subparsers(dest='command')
+
+    # Arguments for the log command.
+    parser_log = subparsers.add_parser(
+        'log', help='Log the connection status.'
+    )
+    parser_log.add_argument(
+        'filename', type=str, default=None, nargs='?',
+        help='Path to a the file where results should be appended to. Creates the file if it does not exist. If not specified, results are printed to stdout.'
+    )
+    parser_log.add_argument(
+        '--host', type=str, default='1.1.1.1',
+        help='IP or hostname of a server to query. (default: %(default)s)'
+    )
+    parser_log.add_argument(
+        '--timeout', type=int, default=2,
+        help='Set the timeout in seconds to use for the connection test. (default: %(default)s)'
+    )
+
+    # Arguments for the outages command.
+    parser_outages = subparsers.add_parser(
+        'outages', help='Print/log outages'
+    )
+    parser_outages.add_argument(
+        'filename', type=str, nargs='?',
+        help='Path to a file with connection logs.'
+    )
+    parser_outages.add_argument(
+        '--time', type=int, default=3,
+        help='Minimum duration for a connection loss to be considered an outage. (default: %(default)s)'
+    )
+
+    return parser.parse_args(args)
+
+
+def main() -> None:
+
+    args = parseArgs(sys.argv[1:])
+
+    if args.command == 'log':
+        log(args.host, args.timeout, args.filename)
+    elif args.command == 'outages':
+        printOutages(args.filename, args.time)
+
+
+if __name__ == '__main__':
+    main()