tasks.py

"""Tasks for use with Invoke."""
import os
import sys
from distutils.util import strtobool
from invoke import task

try:
    import toml
except ImportError:
    sys.exit("Please make sure to `pip install toml` or enable the Poetry shell and run `poetry install`.")


def is_truthy(arg):
    """Convert "truthy" strings into Booleans.
    Examples:
        >>> is_truthy('yes')
        True
    Args:
        arg (str): Truthy string (True values are y, yes, t, true, on and 1; false values are n, no,
        f, false, off and 0. Raises ValueError if val is anything else.
    """
    if isinstance(arg, bool):
        return arg
    return bool(strtobool(arg))


PYPROJECT_CONFIG = toml.load("pyproject.toml")
TOOL_CONFIG = PYPROJECT_CONFIG["tool"]["poetry"]

# Can be set to a separate Python version to be used for launching or building image
PYTHON_VER = os.getenv("PYTHON_VER", "3.7")
# Name of the docker image/image
IMAGE_NAME = os.getenv("IMAGE_NAME", TOOL_CONFIG["name"])
# Tag for the image
IMAGE_VER = os.getenv("IMAGE_VER", f"{TOOL_CONFIG['version']}-py{PYTHON_VER}")
# Gather current working directory for Docker commands
PWD = os.getcwd()
# Local or Docker execution provide "local" to run locally without docker execution
INVOKE_LOCAL = is_truthy(os.getenv("INVOKE_LOCAL", False))  # pylint: disable=W1508


def run_cmd(context, exec_cmd, local=INVOKE_LOCAL):
    """Wrapper to run the invoke task commands.
    Args:
        context ([invoke.task]): Invoke task object.
        exec_cmd ([str]): Command to run.
        local (bool): Define as `True` to execute locally
    Returns:
        result (obj): Contains Invoke result from running task.
    """
    if is_truthy(local):
        print(f"LOCAL - Running command {exec_cmd}")
        result = context.run(exec_cmd, pty=True)
    else:
        print(f"DOCKER - Running command: {exec_cmd} container: {IMAGE_NAME}:{IMAGE_VER}")
        result = context.run(f"docker run -it -v {PWD}:/local {IMAGE_NAME}:{IMAGE_VER} sh -c '{exec_cmd}'", pty=True)

    return result


@task(
    help={
        "cache": "Whether to use Docker's cache when building images (default enabled)",
        "force_rm": "Always remove intermediate images",
        "hide": "Suppress output from Docker",
    }
)
def build(context, cache=True, force_rm=False, hide=False):
    """Build a Docker image."""
    print(f"Building image {IMAGE_NAME}:{IMAGE_VER}")
    command = f"docker build --tag {IMAGE_NAME}:{IMAGE_VER} --build-arg PYTHON_VER={PYTHON_VER} -f Dockerfile ."

    if not cache:
        command += " --no-cache"
    if force_rm:
        command += " --force-rm"

    result = context.run(command, hide=hide)
    if result.exited != 0:
        print(f"Failed to build image {IMAGE_NAME}:{IMAGE_VER}\nError: {result.stderr}")


@task
def clean(context):
    """Remove the project specific image."""
    print(f"Attempting to forcefully remove image {IMAGE_NAME}:{IMAGE_VER}")
    context.run(f"docker rmi {IMAGE_NAME}:{IMAGE_VER} --force")
    print(f"Successfully removed image {IMAGE_NAME}:{IMAGE_VER}")


@task
def rebuild(context):
    """Clean the Docker image and then rebuild without using cache."""
    clean(context)
    build(context, cache=False)


@task(help={"local": "Run locally or within the Docker container"})
def pytest(context, local=INVOKE_LOCAL):
    """Run pytest test cases."""
    exec_cmd = "pytest"
    run_cmd(context, exec_cmd, local)


@task(help={"local": "Run locally or within the Docker container"})
def black(context, path=".", local=INVOKE_LOCAL):
    """Run black to check that Python files adherence to black standards."""
    exec_cmd = f"black {path}"
    run_cmd(context, exec_cmd, local)


@task(help={"local": "Run locally or within the Docker container"})
def flake8(context, path=".", local=INVOKE_LOCAL):
    """Run flake8 code analysis."""
    exec_cmd = f"flake8 {path}"
    run_cmd(context, exec_cmd, local)


@task(help={"local": "Run locally or within the Docker container"})
def pylint(context, path=".", local=INVOKE_LOCAL):
    """Run pylint code analysis."""
    exec_cmd = f'find {path} -name "*.py" | xargs pylint'
    run_cmd(context, exec_cmd, local)


@task(help={"local": "Run locally or within the Docker container"})
def pydocstyle(context, path=".", local=INVOKE_LOCAL):
    """Run pydocstyle to validate docstring formatting adheres to NTC defined standards."""
    exec_cmd = f"pydocstyle {path}"
    run_cmd(context, exec_cmd, local)


@task(help={"local": "Run locally or within the Docker container"})
def bandit(context, path=".", local=INVOKE_LOCAL):
    """Run bandit to validate basic static code security analysis."""
    exec_cmd = f"bandit --recursive ./{path} --configfile .bandit.yml"
    run_cmd(context, exec_cmd, local)


@task
def cli(context):
    """Enter the image to perform troubleshooting or dev work."""
    dev = f"docker run -it -v {PWD}:/local {IMAGE_NAME}:{IMAGE_VER} /bin/bash"
    context.run(f"{dev}", pty=True)


@task(help={"local": "Run locally or within the Docker container"})
def tests(context, path=".", local=INVOKE_LOCAL):
    """Run all tests for this repository."""
    black(context, path, local)
    flake8(context, path, local)
    pylint(context, path, local)
    pydocstyle(context, path, local)
    bandit(context, path, local)
    pytest(context, local)

    print("All tests have passed!")