feat: add basefiles

.flake8

@@ -0,0 +1,3 @@
+[flake8]
+extend-ignore = E226,E302,E41,E231,B008
+max-line-length=88

.gitignore

@@ -0,0 +1,76 @@
+.idea/*
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+*.manifest
+*.spec
+pip-log.txt
+pip-delete-this-directory.txt
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+*.mo
+*.pot
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+instance/
+.webassets-cache
+.scrapy
+docs/_build/
+.pybuilder/
+target/
+.ipynb_checkpoints
+profile_default/
+ipython_config.py
+__pypackages__/
+celerybeat-schedule
+celerybeat.pid
+*.sage.py
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+.spyderproject
+.spyproject
+.ropeproject
+/site
+.mypy_cache/
+.dmypy.json
+dmypy.json
+.pyre/
+.pytype/
+cython_debug/

.pre-commit-config.yaml

@@ -0,0 +1,79 @@
+default_language_version:
+  python: python3.9
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.3.0
+    hooks:
+      - id: trailing-whitespace
+        args: [ --markdown-linebreak-ext=md ]
+      - id: end-of-file-fixer
+      - id: debug-statements
+      - id: mixed-line-ending
+        args: [ --fix=lf ]
+      - id: detect-private-key
+      - id: check-merge-conflict
+
+  - repo: https://github.com/psf/black
+    rev: 22.8.0
+    hooks:
+      - id: black
+        pass_filenames: false
+        args:
+          - ports
+          - "tests"
+
+  - repo: https://github.com/asottile/pyupgrade
+    rev: v2.37.3
+    hooks:
+      - id: pyupgrade
+        args: [ "--py39-plus" ]
+
+  - repo: https://github.com/hadialqattan/pycln
+    rev: v2.1.1
+    hooks:
+      - id: pycln
+        args: [ --config=pyproject.toml ]
+
+  - repo: https://github.com/codespell-project/codespell
+    rev: v2.2.1
+    hooks:
+      - id: codespell
+
+  - repo: https://github.com/pycqa/bandit
+    rev: 1.7.4
+    hooks:
+      - id: bandit
+        exclude: "test_*"
+        args: [ "-iii", "-ll", "-s=B308,B703" ]
+
+  - repo: https://gitlab.com/pycqa/flake8
+    rev: 3.9.2
+    hooks:
+      - id: flake8
+        additional_dependencies:
+          - "flake8-bugbear"
+          - "flake8-comprehensions"
+          - "flake8-mutable"
+          - "flake8-simplify"
+          - "flake8-type-checking"
+          - "flake8-pytest-style"
+          - "flake8-implicit-str-concat"
+          - "flake8-noqa"
+
+  - repo: https://github.com/pycqa/pylint
+    rev: "v2.15.2"
+    hooks:
+      - id: pylint
+        exclude: "test_*"
+        args: [ "--unsafe-load-any-extension=y" ]
+        additional_dependencies:
+          - typer
+          - psutil
+          - rich
+
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v0.971
+    hooks:
+      - id: mypy
+        files: ^ports/

README.md

@@ -0,0 +1,4 @@
+# ports
+
+small port informer utility
+``

interrogate.svg

@@ -0,0 +1,58 @@
+<svg width="140" height="20" viewBox="0 0 140 20" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" xmlns:serif="http://www.serif.com/" style="fill-rule:evenodd;clip-rule:evenodd;stroke-linejoin:round;stroke-miterlimit:2;">
+    <title>interrogate: 30.0%</title>
+    <g transform="matrix(1,0,0,1,22,0)">
+        <g id="backgrounds" transform="matrix(1.32789,0,0,1,-22.3892,0)">
+            <rect x="0" y="0" width="71" height="20" style="fill:rgb(85,85,85);"/>
+        </g>
+        <rect x="71" y="0" width="47" height="20" data-interrogate="color" style="fill:#e05d44"/>
+        <g transform="matrix(1.19746,0,0,1,-22.3744,-4.85723e-16)">
+            <rect x="0" y="0" width="118" height="20" style="fill:url(#_Linear1);"/>
+        </g>
+    </g>
+    <g fill="#fff" text-anchor="middle" font-family="DejaVu Sans,Verdana,Geneva,sans-serif" font-size="110">
+        <text x="590" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="610">interrogate</text>
+        <text x="590" y="140" transform="scale(.1)" textLength="610">interrogate</text>
+        <text x="1160" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="370" data-interrogate="result">30.0%</text>
+        <text x="1160" y="140" transform="scale(.1)" textLength="370" data-interrogate="result">30.0%</text>
+    </g>
+    <g id="logo-shadow" serif:id="logo shadow" transform="matrix(0.854876,0,0,0.854876,-6.73514,1.732)">
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poetry.lock

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+[[package]]
+name = "black"
+version = "22.8.0"
+description = "The uncompromising code formatter."
+category = "dev"
+optional = false
+python-versions = ">=3.6.2"
+
+[package.dependencies]
+click = ">=8.0.0"
+mypy-extensions = ">=0.4.3"
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+]
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+]
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+]

ports/commands/base.py

@@ -0,0 +1,155 @@
+from abc import ABC, abstractmethod
+from enum import Enum
+from typing import Optional
+
+import psutil
+from psutil import NoSuchProcess
+from rich.console import Console
+from rich.table import Table
+
+
+class PrintFormat(str, Enum):  # pylint: disable=missing-class-docstring
+    PLAIN = "PLAIN"
+    TABLE = "TABLE"
+
+
+class PortInfo:  # pylint: disable=too-few-public-methods
+    """Simple port information wrapper around a few attributes"""
+
+    def __init__(
+        self,
+        is_open: bool,
+        port: int,
+        pid: Optional[int] = None,
+        process_name: Optional[str] = None,
+        interface: Optional[str] = None,
+    ):  # pylint: disable=too-many-arguments
+        self.is_open = is_open
+        self.port = port
+        self.pid = pid
+        self.process_name = process_name
+        self.interface = interface
+
+
+class BaseCommand(ABC):
+    """Base command abstract class. Adds a few utility methods but needs a
+    specific implementation
+
+    Attributes:
+        start_port (int): First port to filter
+        end_port (int): Last port to filter
+        print_format (PrintFormat): enum used to discriminate between plain or table
+            console output
+    """
+
+    def __init__(
+        self,
+        start_port: int = 1,
+        end_port: int = 65535,
+        print_format: PrintFormat = PrintFormat.TABLE,
+    ):
+        if start_port > end_port:
+            raise ValueError("start-port must be greater than end-port")
+        self.print_format = print_format
+        self.start_port = start_port
+        self.end_port = end_port
+
+    @staticmethod
+    def _get_name_of_pid(pid: int) -> str:
+        """Return the name of a process given its PID
+
+        Note that, even though this makes use of `psutil.Process(pid)`, it'll capture
+        a `NoSuchProcess` exception -if risen- and return an empty string instead
+
+        Args:
+            pid (int): process ID
+        Returns:
+            the process name or an empty string
+        """
+        try:
+            return psutil.Process(pid).name()
+        except NoSuchProcess:
+            return ""
+
+    @staticmethod
+    def _normalize_interface(interface: str) -> str:
+        """Return `localhost` for any combination of loopback or 0.0.0.0 IPs
+
+        Args:
+            interface (str): ip or interface
+        Returns:
+            `"localhost"` if it's a loopback interface or the same input ip if not
+        """
+        if interface.startswith("127") or interface in ["::", "::1", "0.0.0.0"]:
+            return "localhost"
+        return interface
+
+    @property
+    def closed_portinfos(self) -> list[PortInfo]:
+        """Return a per-port sorted list of `PortInfo` object that map the result of
+        `psutil.net_connections` by picking the connections that are inside the
+        [start_port, end_port] range
+
+        Returns:
+            sorted list[PortInfo]
+        """
+        portinfos = []
+        for conn in psutil.net_connections():
+            if conn.pid and self.start_port <= conn.laddr.port <= self.end_port:
+                portinfos.append(
+                    PortInfo(
+                        is_open=False,
+                        port=conn.laddr.port,
+                        pid=conn.pid,
+                        process_name=self._get_name_of_pid(conn.pid),
+                        interface=self._normalize_interface(conn.laddr.ip),
+                    )
+                )
+        return sorted(portinfos, key=lambda x: x.port)
+
+    def _print_plain(self, portinfos: list[PortInfo]):
+        """For every `PortInfo`, print if it's open, its port, pid, process_name and
+        interface
+
+        Args:
+             portinfos (list[PortInfo]): list of PortInfo
+        """
+        for portinfo in portinfos:
+            printable = f"{'OPEN' if portinfo.is_open else 'CLOSED'}\t{portinfo.port}"
+            if portinfo.pid:
+                printable = (
+                    f"{printable}"
+                    f"\t{portinfo.pid}"
+                    f"\t{portinfo.process_name}"
+                    f"\t{portinfo.interface}"
+                )
+            print(printable)
+
+    def _print_table(self, portinfos: list[PortInfo]):
+        """For every `PortInfo`, print if it's open, its port, pid, process_name and
+        interface
+
+        Args:
+             portinfos (list[PortInfo]): list of PortInfo
+        """
+        table = Table(title="Connections table")
+        table.add_column("Open/Closed")
+        table.add_column("Port")
+        table.add_column("PID")
+        table.add_column("Process name")
+        table.add_column("Interface")
+        for portinfo in portinfos:
+            table.add_row(
+                "OPEN" if portinfo.is_open else "CLOSED",
+                str(portinfo.port or ""),
+                str(portinfo.pid or ""),
+                portinfo.process_name,
+                portinfo.interface,
+            )
+        Console().print(table)
+
+    @abstractmethod
+    def execute(self):
+        """Execute the command, meaning picking a print format and printing.
+        Implementations may also use this method to further filter the open/closed
+        portinfos"""

ports/commands/closed.py

@@ -0,0 +1,9 @@
+from ports.commands.base import BaseCommand, PrintFormat
+
+
+class ClosedCommand(BaseCommand):  # pylint: disable=missing-class-docstring
+    def execute(self) -> None:
+        if self.print_format == PrintFormat.PLAIN:
+            self._print_plain(self.closed_portinfos)
+        else:
+            self._print_table(self.closed_portinfos)

ports/commands/open.py

@@ -0,0 +1,44 @@
+from rich.console import Console
+from rich.table import Table
+
+from ports.commands.base import BaseCommand, PrintFormat, PortInfo
+
+
+class OpenCommand(BaseCommand):  # pylint: disable=missing-class-docstring
+    def _fill_portinfos(self, closed_portinfos: list[PortInfo]) -> list[PortInfo]:
+        """Since `super.closed_portinfos` returns the closed port info but this command
+        prints the list of open ports, we need to fill the list with the remaining ports
+        inside the [start_port, end_port] range
+
+        TODO:
+            - optimize this MN shitshow
+
+        Args:
+            closed_portinfos (list[PortInfo]): list of closed PortInfo objects
+        Returns:
+            list of open PortInfo objects
+        """
+        filled_portinfos = []
+        for i in range(self.start_port, self.end_port + 1):
+            if not [portinfo for portinfo in closed_portinfos if portinfo.port == i]:
+                filled_portinfos.append(PortInfo(is_open=True, port=i))
+        return filled_portinfos
+
+    def _print_table(self, portinfos: list[PortInfo]):
+        table = Table(title="Connections table")
+        table.add_column("Open/Closed")
+        table.add_column("Port")
+        for portinfo in portinfos:
+            table.add_row(
+                "OPEN" if portinfo.is_open else "CLOSED",
+                str(portinfo.port or ""),
+            )
+        Console().print(table)
+
+    def execute(self) -> None:
+        closed_portinfos = self.closed_portinfos
+        portinfos = self._fill_portinfos(closed_portinfos)
+        if self.print_format == PrintFormat.PLAIN:
+            self._print_plain(portinfos)
+        else:
+            self._print_table(portinfos)

ports/main.py

@@ -0,0 +1,33 @@
+import typer
+
+from ports.commands.base import PrintFormat
+from ports.commands.closed import ClosedCommand
+from ports.commands.open import OpenCommand
+
+app = typer.Typer()
+
+
+@app.command()
+def closed(
+    first_port: int = typer.Argument(1),
+    last_port: int = typer.Argument(65535),
+    plain: bool = False,
+):  # pylint: disable=missing-function-docstring
+    ClosedCommand(
+        first_port, last_port, PrintFormat.PLAIN if plain else PrintFormat.TABLE
+    ).execute()
+
+
+@app.command()
+def open(
+    first_port: int = typer.Argument(1),
+    last_port: int = typer.Argument(65535),
+    plain: bool = False,
+):  # pylint: disable=redefined-builtin,missing-function-docstring
+    OpenCommand(
+        first_port, last_port, PrintFormat.PLAIN if plain else PrintFormat.TABLE
+    ).execute()
+
+
+if __name__ == "__main__":
+    app()

pyproject.toml

@@ -0,0 +1,40 @@
+[tool.poetry]
+name = "ports"
+version = "0.1.0"
+description = ""
+authors = ["cătălin <catalin@roboces.dev>"]
+readme = "README.md"
+
+[tool.poetry.scripts]
+ports = "ports.main:app"
+
+[tool.poetry.dependencies]
+python = "^3.9"
+typer = "^0.6.1"
+psutil = "^5.9.2"
+rich = "^12.5.1"
+
+
+[tool.poetry.group.linters.dependencies]
+black = "^22.8.0"
+
+
+[tool.poetry.group.test.dependencies]
+ward = "^0.66.1b0"
+ward-coverage = "^0.1.5"
+
+
+[tool.ward]
+hook_module = ["ward_coverage"]
+
+[tool.mypy]
+python_version = 3.9
+warn_return_any = false
+no_warn_no_return = true
+
+[tool.pylint.main]
+disable = 'missing-module-docstring'
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"

tests/test_base.py

@@ -0,0 +1,55 @@
+import ipaddress
+import random
+import subprocess
+
+from ward import test, fixture
+
+from ports.commands.base import BaseCommand
+
+
+def _get_random_number_between_1_and_254() -> int:
+    return random.randint(1, 254)
+
+
+@fixture
+def dev_null_pid():
+    p = subprocess.Popen(["tail", "-f", "/dev/null"])
+    yield p.pid
+    p.kill()
+
+
+@test(
+    "`_get_name_of_pid` of non-existing process should return empty string instead of "
+    "raising `NoSuchProcess`"
+)
+def _():
+    assert not BaseCommand._get_name_of_pid(10000000)
+
+
+@test("`_get_name_of_pid` should return `tail` ")
+def _(dnp: int = dev_null_pid):
+    assert BaseCommand._get_name_of_pid(dnp) == "tail"
+
+
+@test("`_normalize_interface` of `::`, `::1` and `0.0.0.0` should return `localhost`")
+def _():
+    assert (
+        BaseCommand._normalize_interface("::")
+        == BaseCommand._normalize_interface("::1")
+        == BaseCommand._normalize_interface("0.0.0.0")
+        == BaseCommand._normalize_interface("localhost")
+        == "localhost"
+    )
+
+
+@test("`_normalize_interface` of any `127.0.0.0/8` ip should return `localhost`")
+def _():
+    # iterating over the real /8 range would take a bit too much
+    # so let's randomize 32 IPs
+
+    random_second_block = _get_random_number_between_1_and_254()
+    random_third_block = _get_random_number_between_1_and_254()
+    for ip in ipaddress.IPv4Network(
+        f"127.{random_second_block}.{random_third_block}.0/24"
+    ):
+        assert BaseCommand._normalize_interface(str(ip)) == "localhost"

tests/test_open.py

@@ -0,0 +1,60 @@
+import subprocess
+from time import sleep
+
+from ward import test, fixture, raises
+
+from ports.commands.base import PortInfo
+from ports.commands.open import OpenCommand
+
+
+@fixture
+def closed_portinfs_8000_to_8020():
+    """
+    can't yield this because `_fill_portinfos` consumes it for every port
+    """
+    return [PortInfo(is_open=False, port=i) for i in range(8000, 8021)]
+
+
+@fixture
+def http_server_pid():
+    p = subprocess.Popen(["python3", "-m", "http.server", "14520"])
+    sleep(1)  # the server may take a bit to be up-n-running
+    yield p.pid
+    p.kill()
+
+
+@fixture
+def open_command_8000_to_8021():
+    yield OpenCommand(start_port=7990, end_port=8025)
+
+
+@test("initializing with start port 80 and end port 79 should raise `ValueError`")
+def _():
+    with raises(ValueError):
+        OpenCommand(start_port=80, end_port=79)
+
+
+@test(
+    "`closed_portinfos` returns a list with the port 14520 closed by the "
+    "`http.server` process"
+)
+def _(hpd: int = http_server_pid):
+    closed_portinfos = OpenCommand().closed_portinfos
+    portinfo_14520 = [
+        portinfo for portinfo in closed_portinfos if portinfo.port == 14520
+    ][0]
+    assert portinfo_14520
+    assert portinfo_14520.pid == hpd
+    assert portinfo_14520.interface == "localhost"
+    assert portinfo_14520.process_name == "python3"
+
+
+@test("`_fill_portinfos` of [7990..8025] should return [7990..7999],[8022...8025]")
+def _(
+    cp: list[PortInfo] = closed_portinfs_8000_to_8020,
+    op: OpenCommand = open_command_8000_to_8021,
+):
+    filled_portinfos = op._fill_portinfos(cp)
+    assert len(filled_portinfos) == 8025 - 8000 - 20 + 8000 - 7990
+    for portinfo in filled_portinfos:
+        assert portinfo.port in range(7990, 8000) or portinfo.port in range(8021, 8026)