Original code by Dmitriy

src/python-service/.dockerignore

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+.venv/
+tests/

src/python-service/.gitignore

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+# Python dependencies
+.venv/
+
+# Python cache
+__pycache__/
+.pytest_cache/
+
+# Coverage reports
+/.coverage
+htmlcov/
+
+# Environment variables
+.env

src/python-service/.lintstagedrc.json

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+{
+  "*.py": [
+    ".venv/bin/python -m black --check",
+    ".venv/bin/python -m isort --check",
+    ".venv/bin/python -m sort_all",
+    ".venv/bin/python -m pyupgrade --py310-plus",
+    ".venv/bin/python -m pylint",
+    "../node_modules/.bin/pyright"
+  ],
+  "*.toml": [".venv/bin/toml-sort --check"]
+}

src/python-service/.prettierignore

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+# Python dependencies
+.venv/
+
+# Python cache
+__pycache__/
+.pytest_cache/
+
+# Coverage reports
+/.coverage
+
+# Environment variables
+.env

src/python-service/Dockerfile

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+FROM ghcr.io/yp-middle-python-24/python-dev:3.10-jammy-0.0.1 AS builder
+
+RUN mkdir --parents /opt/app
+COPY pyproject.toml /opt/app/pyproject.toml
+COPY poetry.lock /opt/app/poetry.lock
+COPY poetry.toml /opt/app/poetry.toml
+
+WORKDIR /opt/app
+RUN poetry install --no-dev
+
+FROM ghcr.io/yp-middle-python-24/python:3.10-jammy-0.0.1 AS runtime
+
+RUN mkdir --parents /opt/app
+COPY --from=builder /opt/app/.venv /opt/app/.venv
+COPY bin /opt/app/bin
+COPY lib /opt/app/lib
+
+WORKDIR /opt/app
+CMD [".venv/bin/python", "-m", "bin.main"]

src/python-service/Makefile

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+IMAGE_REGISTRY=ghcr.io/yp-middle-python-24
+IMAGE_REPOSITORY=python-service-example-backend
+
+PENV = .venv
+NENV = ../node_modules
+PYTHON = $(PENV)/bin/python
+PYRIGHT = $(NENV)/.bin/pyright
+TOML_SORT = $(PENV)/bin/toml-sort
+
+PROJECT_FOLDERS = bin lib tests
+
+.PHONY: init
+init:
+	@echo 'Installing python dependencies...'
+	@poetry install
+
+.PHONY: lint
+lint:
+	@echo 'Running poetry checks...'
+	@poetry check
+
+	@echo 'Running black checks...'
+	@$(PYTHON) -m black --check .
+
+	@echo 'Running isort checks...'
+	@$(PYTHON) -m isort --check .
+
+	@echo 'Running toml-sort checks...'
+	@$(TOML_SORT) --check poetry.toml pyproject.toml
+	@echo ''
+
+	@echo 'Running pylint checks...'
+	@$(PYTHON) -m pylint .
+
+	@echo 'Running pyright checks...'
+	@$(PYRIGHT)
+
+.PHONY: lint-fix
+lint-fix:
+	@echo 'Running poetry autofixes...'
+	@poetry check
+	@poetry lock --no-update
+
+	@echo 'Running black autofixes...'
+	@$(PYTHON) -m black --safe .
+
+	@echo 'Running isort autofixes...'
+	@$(PYTHON) -m isort --atomic .
+
+	@echo 'Running toml-sort autofixes...'
+	@$(TOML_SORT) --in-place poetry.toml pyproject.toml
+
+	@echo 'Running sort-all autofixes...'
+	@find $(PROJECT_FOLDERS) -name '*.py' -type f -exec $(PYTHON) -m sort_all '{}' \;
+
+	@echo 'Running pyupgrade autofixes...'
+	@find $(PROJECT_FOLDERS) -name '*.py' -type f -exec $(PYTHON) -m pyupgrade --py310-plus '{}' \;
+
+	@echo 'Running pylint checks...'
+	@$(PYTHON) -m pylint .
+
+	@echo 'Running pyright checks...'
+	@$(PYRIGHT)
+
+.PHONY: test
+test:
+	@echo 'Running tests...'
+	@#$(PYTHON) -m pytest tests
+
+.PHONY: clean
+clean:
+	@echo 'Cleaning python dependencies...'
+	@rm -rf $(PENV)
+
+	@echo 'Cleaning pytest cache...'
+	@rm -rf .pytest_cache
+
+	@echo 'Cleaning coverage results...'
+	@rm -rf .coverage
+	@rm -rf htmlcov
+
+# Local development
+
+.PHONY: dev-server-start
+dev-server-start:
+	@$(PYTHON) -m bin.main
+
+# Test coverage
+
+.PHONY: test-coverage-run
+test-coverage-run:
+	@echo 'Running test coverage...'
+	@$(PYTHON) -m coverage run -m pytest tests
+
+.PHONY: test-coverage-report
+test-coverage-report:
+	@$(PYTHON) -m coverage report -m
+
+.PHONY: test-coverage-html
+test-coverage-html:
+	@$(PYTHON) -m coverage html
+	@$(PYTHON) -m webbrowser -t htmlcov/index.html
+
+# CI-specific
+
+.PHONY: ci-image-build
+ci-image-build:
+	@echo 'Building image...'
+	@docker build --tag $(IMAGE_REGISTRY)/$(IMAGE_REPOSITORY):$(IMAGE_TAG) .
+
+.PHONY: ci-image-push
+ci-image-push:
+	@echo 'Uploading image...'
+	@docker push $(IMAGE_REGISTRY)/$(IMAGE_REPOSITORY):$(IMAGE_TAG)

src/python-service/README.md

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+# Python Service Example Backend
+
+Python Service Example Backend
+
+## Development
+
+### Global dependencies
+
+- poetry
+
+### Makefile commands
+
+- `make init` - Initialize service
+- `make lint` - Lint service
+- `make lint-fix` - Auto-fix service
+- `make test` - Test service
+- `make clean` - Clean up service
+- `make dev-server-start` - Start dev server
+- `make test-coverage-run` - Collect test coverage data
+- `make test-coverage-report` - Show coverage report in console
+- `make test-coverage-html` - Prepare and show coverage report in browser
+- `make ci-image-build` - Build production container
+- `make ci-image-push` - Push production container to yccr
+
+### Environment variables
+
+- `APP_ENV` - Application environment (development, production, etc.)
+- `APP_VERSION` - Application version

src/python-service/bin/main/__main__.py

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+import asyncio
+import logging
+import os
+
+import lib.app as app
+
+logger = logging.getLogger(__name__)
+
+
+async def run() -> None:
+    settings = app.Settings()
+    application = app.Application.from_settings(settings)
+
+    try:
+        await application.start()
+    finally:
+        await application.dispose()
+
+
+def main() -> None:
+    try:
+        asyncio.run(run())
+        exit(os.EX_OK)
+    except SystemExit:
+        exit(os.EX_OK)
+    except app.ApplicationError:
+        exit(os.EX_SOFTWARE)
+    except KeyboardInterrupt:
+        logger.info("Exited with keyboard interruption")
+        exit(os.EX_OK)
+    except BaseException:
+        logger.exception("Unexpected error occurred")
+        exit(os.EX_SOFTWARE)
+
+
+if __name__ == "__main__":
+    main()

src/python-service/lib/api/rest/v1/health/__init__.py

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+from .liveness_probe import LivenessProbeHandler
+
+__all__ = [
+    "LivenessProbeHandler",
+]

src/python-service/lib/api/rest/v1/health/liveness_probe.py

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+import json
+
+import aiohttp.web as aiohttp_web
+
+import lib.utils.aiohttp as aiohttp_utils
+
+
+class LivenessProbeHandler(aiohttp_utils.HandlerProtocol):
+    async def process(self, request: aiohttp_web.Request) -> aiohttp_web.Response:
+        return aiohttp_web.Response(
+            status=200,
+            body=json.dumps(obj={"status": "healthy"}),
+        )
+
+
+__all__ = [
+    "LivenessProbeHandler",
+]

src/python-service/lib/app/__init__.py

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+from .app import Application
+from .errors import ApplicationError, DisposeError, StartServerError
+from .settings import Settings
+
+__all__ = [
+    "Application",
+    "ApplicationError",
+    "DisposeError",
+    "Settings",
+    "StartServerError",
+]

src/python-service/lib/app/app.py

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+import asyncio
+import dataclasses
+import logging
+import typing
+
+import aiohttp.web as aiohttp_web
+import typing_extensions
+
+import lib.api.rest.v1.health as health_handlers
+import lib.app.errors as app_errors
+import lib.app.settings as app_settings
+
+logger = logging.getLogger(__name__)
+
+
+@dataclasses.dataclass
+class DisposableResource:
+    name: str
+    dispose_callback: typing.Awaitable[typing.Any]
+
+
+class Application:
+    def __init__(
+        self,
+        settings: app_settings.Settings,
+        aio_app: aiohttp_web.Application,
+        disposable_resources: typing.Sequence[DisposableResource],
+    ) -> None:
+        self._settings = settings
+        self._aio_app = aio_app
+        self._disposable_resources = disposable_resources
+
+    @classmethod
+    def from_settings(cls, settings: app_settings.Settings) -> typing_extensions.Self:
+        # Logging
+
+        logging.basicConfig(
+            level=settings.LOGS_MIN_LEVEL,
+            format=settings.LOGS_FORMAT,
+        )
+
+        logger.info("Initializing application")
+        disposable_resources = []
+
+        # Global clients
+
+        logger.info("Initializing global clients")
+
+        # Clients
+
+        logger.info("Initializing clients")
+
+        # Repositories
+
+        logger.info("Initializing repositories")
+
+        # Caches
+
+        logger.info("Initializing caches")
+
+        # Services
+
+        logger.info("Initializing services")
+
+        # Handlers
+
+        logger.info("Initializing handlers")
+        liveness_probe_handler = health_handlers.LivenessProbeHandler()
+
+        logger.info("Creating application")
+        aio_app = aiohttp_web.Application()
+
+        # Routes
+        aio_app.add_routes(
+            [
+                aiohttp_web.get(
+                    "/api/v1/health/liveness",
+                    liveness_probe_handler.process,
+                ),
+            ]
+        )
+
+        application = Application(
+            settings=settings,
+            aio_app=aio_app,
+            disposable_resources=disposable_resources,
+        )
+
+        logger.info("Initializing application finished")
+
+        return application
+
+    async def start(self) -> None:
+        logger.info("Discord server is starting")
+
+        try:
+            await aiohttp_web._run_app(
+                app=self._aio_app,
+                host=self._settings.SERVER_HOST,
+                port=self._settings.SERVER_PORT,
+            )
+        except asyncio.CancelledError:
+            logger.info("HTTP server has been interrupted")
+        except BaseException as unexpected_error:
+            logger.exception("HTTP server failed to start")
+            raise app_errors.StartServerError("HTTP server failed to start") from unexpected_error
+
+    async def dispose(self) -> None:
+        logger.info("Application is shutting down...")
+        dispose_errors = []
+
+        for resource in self._disposable_resources:
+            logger.info("Disposing %s...", resource.name)
+            try:
+                await resource.dispose_callback
+            except Exception as unexpected_error:
+                dispose_errors.append(unexpected_error)
+                logger.exception("Failed to dispose %s", resource.name)
+            else:
+                logger.info("%s has been disposed", resource.name)
+
+        if len(dispose_errors) != 0:
+            logger.error("Application has shut down with errors")
+            raise app_errors.DisposeError("Application has shut down with errors, see logs above")
+
+        logger.info("Application has successfully shut down")
+
+
+__all__ = [
+    "Application",
+]

src/python-service/lib/app/errors.py

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+import typing
+
+
+class ApplicationError(Exception):
+    def __init__(self, message: str, *args: typing.Any) -> None:
+        super().__init__(*args)
+        self.message = message
+
+
+class DisposeError(ApplicationError):
+    pass
+
+
+class StartServerError(ApplicationError):
+    pass
+
+
+__all__ = [
+    "ApplicationError",
+    "DisposeError",
+    "StartServerError",
+]

src/python-service/lib/app/settings.py

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+import typing
+
+import pydantic
+
+LogLevel = typing.Literal["CRITICAL", "ERROR", "WARNING", "INFO", "DEBUG"]
+
+
+class Settings(pydantic.BaseSettings):
+    # App
+
+    APP_ENV: str = "development"
+    APP_NAME: str = "discord-chatbot-backend"
+    APP_VERSION: str = "0.0.1"
+
+    # Logging
+
+    LOGS_MIN_LEVEL: LogLevel = "DEBUG"
+    LOGS_FORMAT: str = "%(asctime)s | %(name)s | %(levelname)s | %(message)s"
+
+    # Server
+
+    SERVER_HOST: str = "localhost"
+    SERVER_PORT: int = 8080
+
+    @property
+    def is_development(self) -> bool:
+        return self.APP_ENV == "development"
+
+
+__all__ = [
+    "Settings",
+]

src/python-service/lib/utils/aiohttp/__init__.py

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+from .types import HandlerProtocol
+
+__all__ = [
+    "HandlerProtocol",
+]

src/python-service/lib/utils/aiohttp/types/__init__.py

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+from .handler import HandlerProtocol
+
+__all__ = [
+    "HandlerProtocol",
+]

src/python-service/lib/utils/aiohttp/types/handler.py

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+import typing
+
+import aiohttp.web as aiohttp_web
+
+
+class HandlerProtocol(typing.Protocol):
+    async def process(self, request: aiohttp_web.Request) -> aiohttp_web.Response:
+        ...
+
+
+__all__ = [
+    "HandlerProtocol",
+]

src/python-service/poetry.toml

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+[virtualenvs]
+create = true
+in-project = true

src/python-service/pyproject.toml

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+[build-system]
+build-backend = "poetry.core.masonry.api"
+requires = ["poetry-core>=1.0.0"]
+
+[tool.black]
+line-length = 120
+target-version = ["py310"]
+
+[tool.coverage.report]
+exclude_lines = [
+    "pragma: no cover",
+    "def __repr__",
+    "raise NotImplementedError",
+    "if __name__ == .__main__.:",
+    "class .*Protocol\\):",
+    "@(abc\\.)?abstractmethod",
+    "if typing.TYPE_CHECKING:",
+]
+
+[tool.coverage.run]
+include = ["bin/*", "lib/*"]
+
+[tool.isort]
+known_first_party = ["bin", "lib", "tests"]
+line_length = 120
+profile = "black"
+py_version = 310
+
+[tool.poetry]
+authors = ["ovsds <ovsds@yandex-team.ru>"]
+description = "Python Service Example Backend"
+name = "python-service-example-backend"
+version = "0.0.1"
+
+[tool.poetry.dependencies]
+aiohttp = "3.8.4"
+pydantic = {extras = ["dotenv"], version = "1.10.2"}
+python = "~3.10"
+typing-extensions = "4.5.0"
+
+[tool.poetry.dev-dependencies]
+black = "22.6.0"
+coverage = "6.5.0"
+isort = "5.10.1"
+pylint = "2.14.5"
+pylint-pydantic = "0.1.4"
+pylint-pytest = "1.1.2"
+pytest = "7.1.2"
+pytest-asyncio = "0.19.0"
+pytest-mock = "3.8.2"
+pyupgrade = "3.1.0"
+sort-all = "1.2.0"
+toml-sort = "0.20.0"
+
+[tool.pylint]
+disable = [
+  "broad-except",
+  "consider-using-from-import",
+  "consider-using-sys-exit",
+  "duplicate-code",
+  "fixme",
+  "missing-docstring",
+  "no-member",
+  "protected-access",
+  "too-few-public-methods",
+  "too-many-instance-attributes",
+  "too-many-locals",
+  "too-many-statements",
+  "unnecessary-ellipsis",
+]
+extension-pkg-allow-list = [
+  "pydantic", # https://github.com/samuelcolvin/pydantic/issues/1961
+]
+ignore-paths = [
+  "^.*venv/.*$",
+]
+load-plugins = [
+  "pylint_pydantic",
+  "pylint_pytest",
+]
+max-args = 10
+max-line-length = 120
+recursive = true
+
+[tool.pylint.basic]
+argument-rgx = "^_{0,2}[a-z][a-z0-9_]*$"
+attr-rgx = "^_{0,2}[a-z][a-z0-9_]*$"
+class-attribute-rgx = "^_{0,2}[a-zA-Z][a-zA-Z0-9_]*$"
+variable-rgx = "^_{0,2}[a-z][a-z0-9_]*$"
+
+[tool.pyright]
+exclude = [
+    "**/__pycache__",
+]
+include = [
+  "bin",
+  "lib",
+  "tests",
+]
+pythonPlatform = "All"
+pythonVersion = "3.10"
+reportConstantRedefinition = "none"
+reportMissingTypeStubs = "warning"
+reportPrivateUsage = "information"
+reportPropertyTypeMismatch = "warning"
+reportUninitializedInstanceVariable = "warning"
+reportUnknownMemberType = "none"
+reportUnnecessaryTypeIgnoreComment = "warning"
+reportUntypedFunctionDecorator = "warning"
+typeCheckingMode = "strict"
+useLibraryCodeForTypes = true
+venv = ".venv"
+venvPath = '.'
+
+[tool.pytest.ini_options]
+pythonpath = "."
+
+[tool.tomlsort]
+all = true
+ignore_case = true
+in_place = true