dev

#!/usr/bin/env python3
"""
"""

import argparse
import functools
import os
import pipes
import re
import requests
import shutil
import subprocess
import sys
import textwrap
import time

import dotenv
import colorama

colorama.init()

def depend_on(binaries=[], envs=[]):
    """
    A decorator to ensure the function is called with the relevant binaries
    available and relevant environment variables set.
    """
    def decorator_depend_on(func):
        @functools.wraps(func)
        def wrapper_depend_on(*args, **kwargs):
            # FEATURE: Allow prompt to set variables interactively.

            missing_binaries = []
            for binary in binaries:
                if shutil.which(binary) is None:
                    missing_binaries.append(binary)
            missing_envs = []
            for env in envs:
                if not os.environ.get(env):
                    missing_envs.append(env)

            if missing_binaries or missing_envs:
                print(f'Exiting due to missing dependencies for "{func.__name__}"')
                print(f"- Binaries: {missing_binaries}")
                print(f"- Env vars: {missing_envs}")
                print("")
                if missing_binaries:
                    print("Install and make the binaries available on your PATH")
                if missing_envs:
                    print("Update your .env file")
                sys.exit(1)
            else:
                return func(*args, **kwargs)

        return wrapper_depend_on

    return decorator_depend_on


@depend_on(binaries=["kubectl", "kind", "docker"], envs=["Z2JH_KUBE_VERSION"])
def kind_create(recreate):
    # check for a existing cluster
    kind_clusters = _run(
        cmd=["kind", "get", "clusters"],
        print_command=True,
        capture_output=True,
    )
    kind_cluster_exist = bool(re.search(r"\bjh-dev\b", kind_clusters))
    if kind_cluster_exist:
        if recreate:
            print("Deleting existing kind cluster")
            _run(["kind", "delete", "cluster", "--name", "jh-dev"])
        else:
            # This workaround currently only works for single node clusters,
            # which is what we currently setup.
            #
            # ref: https://github.com/kubernetes-sigs/kind/issues/148#issuecomment-504712517
            is_kind_cluster_container_running = _run(
                cmd=["docker", "ps", "--quiet", "--filter", "name=jh-dev-control-plane"],
                print_command=False,
                capture_output=True,
            )
            if not is_kind_cluster_container_running:
                print("Starting up existing kind cluster")
                _run(["docker", "start", "jh-dev-control-plane"])
                sys.exit(0)
            else:
                print("The kind cluster was already created and running.")
                sys.exit(0)


    # create and setup a new cluster
    print('Creating kind cluster')
    _run([
        "kind", "create", "cluster",
        "--name", "jh-dev",
        "--image", f"kindest/node:v{os.environ['Z2JH_KUBE_VERSION']}",
        "--config", "ci/kind-config.yaml",
    ])
    
    kubeconfig_path = _run(
        cmd=[
            "kind", "get", "kubeconfig-path",
            "--name", "jh-dev",
        ],
        print_command=False,
        capture_output=True,
    )
    if os.environ.get("KUBECONFIG", None) != kubeconfig_path:
        print(f'Updating your .env file\'s KUBECONFIG value to "{kubeconfig_path}"')
        dotenv.set_key(".env", "KUBECONFIG", kubeconfig_path)
        os.environ["KUBECONFIG"] = kubeconfig_path

    kube_context = _run(
        cmd=["kubectl", "config", "current-context"],
        print_command=False,
        capture_output=True,
    )
    if os.environ.get("Z2JH_KUBE_CONTEXT", None) != kube_context:
        print(f'Updating your .env file\'s Z2JH_KUBE_CONTEXT value to "{kube_context}"')
        dotenv.set_key(".env", "Z2JH_KUBE_CONTEXT", kube_context)
        os.environ["Z2JH_KUBE_CONTEXT"] = kube_context

    if not os.environ.get("Z2JH_KUBE_NAMESPACE", None):
        print(f'Updating your .env file\'s Z2JH_KUBE_NAMESPACE value to "jh-dev"')
        dotenv.set_key(".env", "Z2JH_KUBE_NAMESPACE", "jh-dev")
        os.environ["Z2JH_KUBE_NAMESPACE"] = "jh-dev"

    print('Setting default namespace')
    _run([
        "kubectl", "config", "set-context",
        "--current",
        "--namespace", os.environ["Z2JH_KUBE_NAMESPACE"],
    ])


    # To test network policies, we need a custom CNI like Calico. We have disabled
    # the default CNI through kind-config.yaml and will need to manually install a
    # CNI for the nodes to become Ready.
    print("Installing a custom CNI: Calico (async, in cluster)")
    _run(
        cmd=[
            "kubectl", "apply",
            "-f", "https://docs.projectcalico.org/v3.10/manifests/calico.yaml",
        ],
        print_end="",
    )

    # NOTE: daemonset/calico-node pods' main container fails to start up without
    #       an additional environment variable configured to disable a check
    #       that we fail.
    #
    #       env:
    #         - name: FELIX_IGNORELOOSERPF
    #           value: "true"
    _run(
        cmd=[
            "kubectl", "patch", "daemonset/calico-node",
            "--namespace", "kube-system",
            "--type", "json",
            "--patch", '[{"op":"add", "path":"/spec/template/spec/containers/0/env/-", "value":{"name":"FELIX_IGNORELOOSERPF", "value":"true"}}]',
        ],
    )

    print("Waiting for Kubernetes nodes to become ready.")
    _run(
        # NOTE: kubectl wait has a bug relating to using the --all flag in 1.13
        #       at least Due to this, we wait only for the kind-control-plane
        #       node, which currently is the only node we start with kind but
        #       could be configured in kind-config.yaml.
        #
        #       ref: https://github.com/kubernetes/kubernetes/pull/71746
        cmd=[
            "kubectl", "wait", "node/jh-dev-control-plane",
            "--for", "condition=ready",
            "--timeout", "2m",
        ],
        error_callback=_log_wait_node_timeout,
    )

    print("Installing Helm's tiller asynchronously in the cluster.")
    _run(
        cmd=[
            "kubectl", "create", "serviceaccount", "tiller",
            "--namespace", "kube-system",
        ],
        print_end="",
    )
    _run(
        cmd=[
            "kubectl", "create", "clusterrolebinding", "tiller",
            "--clusterrole", "cluster-admin",
            "--serviceaccount", "kube-system:tiller",
        ],
        print_end="",
    )
    _run([
        "helm", "init",
        "--service-account", "tiller",
    ])

    print("Waiting for Helm's tiller to become ready in the cluster.")
    _run(
        cmd=[
            "kubectl", "rollout", "status", "deployment/tiller-deploy",
            "--namespace", "kube-system",
            "--timeout", "2m",
        ],
        error_callback=_log_tiller_rollout_timeout,
    )

    print('Kind cluster successfully setup!')


@depend_on(binaries=["kind"], envs=[])
def kind_delete():
    print('Deleting kind cluster "jh-dev".')
    _run(["kind", "delete", "cluster", "--name", "jh-dev"])


@depend_on(binaries=["chartpress", "helm"], envs=["KUBECONFIG", "Z2JH_KUBE_CONTEXT", "Z2JH_KUBE_NAMESPACE"])
def upgrade(chart, version, values):
    if chart.startswith("./"):
        print("Building images and updating image tags if needed.")
        _run(["chartpress"])
        # git --no-pager diff

        if "kind-config-jh-dev" in os.environ["KUBECONFIG"]:
            print("Loading the locally built images into the kind cluster.")
            _run([
                "python3", "ci/kind-load-docker-images.py",
                "--kind-cluster", "jh-dev",
            ])
    else:
        print("External chart specified, skipping use of chartpress.")

    print("Installing/upgrading the Helm chart on the Kubernetes cluster.")
    cmd = [
        "helm", "upgrade", "jh-dev", chart,
        "--install",
        "--namespace", os.environ["Z2JH_KUBE_NAMESPACE"],
        "--kube-context", os.environ["Z2JH_KUBE_CONTEXT"],
    ]
    if version:
        cmd.append("--version")
        cmd.append(version)
    for values_file in values:
        cmd.append("--values")
        cmd.append(values_file)
    _run(cmd=cmd)

    print("Waiting for the proxy and hub to become ready.")
    _run(
        cmd=[
            "kubectl", "rollout", "status", "deployment/proxy",
            "--timeout", "2m",
            "--namespace", os.environ["Z2JH_KUBE_NAMESPACE"],
            "--context", os.environ["Z2JH_KUBE_CONTEXT"],
        ],
        print_end=""
    )
    _run([
        "kubectl", "rollout", "status", "deployment/hub",
        "--timeout", "2m",
        "--namespace", os.environ["Z2JH_KUBE_NAMESPACE"],
        "--context", os.environ["Z2JH_KUBE_CONTEXT"],
    ])


@depend_on(binaries=["kubectl"], envs=["KUBECONFIG", "Z2JH_KUBE_CONTEXT", "Z2JH_KUBE_NAMESPACE"])
def port_forward():
    host = os.environ.get("Z2JH_PORT_FORWARD_ADDRESS", "localhost")
    port = os.environ.get("Z2JH_PORT_FORWARD_PORT", "8080")
    service_url = f"http://{host}:{port}"

    print("Run and detach a process to run the kubectl port-forward command.")
    proc = _run(
        cmd=[
            "kubectl", "port-forward", "service/proxy-public",
            "--namespace", os.environ["Z2JH_KUBE_NAMESPACE"],
            "--context", os.environ["Z2JH_KUBE_CONTEXT"],
            "--pod-running-timeout", "1s",
            "--address", host,
            f'{port}:80',
        ],
        detach=True,
    )

    try:
        # Ensure there has been enough time for the detached port-forwarding
        # process to establish a connection
        time.sleep(1.05)
        response = requests.get(service_url, timeout=1)
    except requests.exceptions.ConnectionError as e:
        # this is a signature of a failed port forwarding
        print("Port-forwarding failed!")
        sys.exit(1)
    except requests.exceptions.Timeout as e:
        # this is a signature of successful port forwarding with services not responding
        print("Port-forwarding seems to work but the proxy pod didn't respond quickly.")
    else:
        # this is a signature of a successful web response
        print("Port-forwarding success!")



@depend_on(binaries=["kubectl", "pytest"], envs=["KUBECONFIG", "Z2JH_KUBE_CONTEXT", "Z2JH_KUBE_NAMESPACE"])
def test():
    _run(
        cmd=["pytest", "-v", "--exitfirst", "./tests"],
        error_callback=_log_test_failure,
    )
    
    print("Tests succeeded!")
    _run(
        cmd=[
            "kubectl", "get", "pods",
            "--namespace", os.environ["Z2JH_KUBE_NAMESPACE"],
            "--context", os.environ["Z2JH_KUBE_CONTEXT"],
        ]
    )


@depend_on(binaries=["helm", "yamllint", "kubeval"], envs=["Z2JH_VALIDATE_KUBE_VERSIONS"])
def check_templates():
    _run([
        "python3", "tools/templates/lint-and-validate.py",
         "--kubernetes-versions", os.environ["Z2JH_VALIDATE_KUBE_VERSIONS"],
    ])


@depend_on(binaries=["black"], envs=[])
def check_python_code(apply):
    raise NotImplementedError()
    # invoke black


@depend_on(binaries=[], envs=["GITHUB_ACCESS_TOKEN"])
def changelog():
    raise NotImplementedError()
    # invoke gitlab-activity


def _log_test_failure():
    print("A test failed, let's debug!")
    _run(
        cmd=[
            "kubectl", "describe", "nodes",
            "--namespace", os.environ["Z2JH_KUBE_NAMESPACE"],
            "--context", os.environ["Z2JH_KUBE_CONTEXT"],
        ],
        exit_on_error=False,
        print_end="",
    )
    _run(
        cmd=[
            "kubectl", "get", "pods",
            "--namespace", os.environ["Z2JH_KUBE_NAMESPACE"],
            "--context", os.environ["Z2JH_KUBE_CONTEXT"],
        ],
        exit_on_error=False,
        print_end="",
    )
    _run(
        cmd=[
            "kubectl", "get", "events",
            "--namespace", os.environ["Z2JH_KUBE_NAMESPACE"],
            "--context", os.environ["Z2JH_KUBE_CONTEXT"],
        ],
        exit_on_error=False,
        print_end="",
    )
    _run(
        cmd=[
            "kubectl", "logs", "deploy/hub",
            "--namespace", os.environ["Z2JH_KUBE_NAMESPACE"],
            "--context", os.environ["Z2JH_KUBE_CONTEXT"],
        ],
        exit_on_error=False,
        print_end="",
    )
    _run(
        cmd=[
            "kubectl", "logs", "deploy/proxy",
            "--namespace", os.environ["Z2JH_KUBE_NAMESPACE"],
            "--context", os.environ["Z2JH_KUBE_CONTEXT"],
        ],
        exit_on_error=False,
    )


def _log_tiller_rollout_timeout():
    print("Helm's tiller never became ready!")
    _run(
        cmd=[
            "kubectl", "describe", "nodes",
            "--context", os.environ["Z2JH_KUBE_CONTEXT"],
        ],
        exit_on_error=False,
        print_end="",
    )
    _run(
        cmd=[
            "kubectl", "describe", "deployment/tiller",
            "--namespace", "kube-system",
            "--context", os.environ["Z2JH_KUBE_CONTEXT"],
        ],
        exit_on_error=False,
        print_end="",
    )
    _run(
        cmd=[
            "kubectl", "logs", "deployment/tiller",
            "--namespace", "kube-system",
            "--context", os.environ["Z2JH_KUBE_CONTEXT"],
        ],
        exit_on_error=False,
    )


def _log_wait_node_timeout():
    print("Kubernetes nodes never became ready")
    _run(
        cmd=[
            "kubectl", "describe", "nodes",
            "--context", os.environ["Z2JH_KUBE_CONTEXT"],
        ],
        exit_on_error=False,
        print_end="",
    )
    _run(
        cmd=[
            "kubectl", "describe", "daemonset/calico-node",
            "--namespace", "kube-system",
            "--context", os.environ["Z2JH_KUBE_CONTEXT"],
        ],
        exit_on_error=False,
        print_end="",
    )
    _run(
        cmd=[
            "kubectl", "logs", "daemonset/calico-node",
            "--namespace", "kube-system",
            "--context", os.environ["Z2JH_KUBE_CONTEXT"],
        ],
        exit_on_error=False,
    )


def _print_command(text):
    print(
        colorama.Style.BRIGHT +
        "$ " +
        colorama.Fore.GREEN +
        text +
        colorama.Style.RESET_ALL +
        colorama.Fore.WHITE +
        colorama.Style.DIM
    )

def _run(cmd, detach=False, print_command=True, print_end="\n", print_error=True, error_callback=None, exit_on_error=True, **kwargs):
    """Run a subcommand and exit if it fails"""
    if kwargs.get("capture_output", None):
        # FIXME: This following lines are a removable workaround at the time we
        #        assume Python 3.7+, but it is required for Python 3.6.
        del kwargs["capture_output"]
        kwargs["stdout"] = kwargs["stderr"] = subprocess.PIPE

    if print_command:
        _print_command(" ".join(map(pipes.quote, cmd)))
    if detach:
        # Call and detach the new process
        with open(os.devnull, 'r+b', 0) as DEVNULL:
            proc = subprocess.Popen(
                cmd,
                stdin=subprocess.DEVNULL,
                stdout=subprocess.DEVNULL,
                stderr=subprocess.DEVNULL,
                close_fds=True,
            )
        return proc
    else:
        # This call will await completion
        proc = subprocess.run(cmd, **kwargs)
    if print_command:
        print(colorama.Style.RESET_ALL, end=print_end)

    if proc.returncode != 0:
        print(
            "`{}` errored ({})".format(" ".join(map(pipes.quote, cmd)), proc.returncode),
            file=sys.stderr,
        )
        if proc.stderr:
            print(proc.stderr.decode("utf-8").strip())
        if error_callback:
            error_callback()
        if exit_on_error:
            sys.exit(proc.returncode)

    if proc.stdout:
        return proc.stdout.decode("utf-8").strip()
    return ""


def _get_argparser():
    _ = argparse.ArgumentParser(
        description="Local development help for jupyterhub/zero-to-jupyterhub-k8s"
    )

    _cmds = _.add_subparsers(title="Commands", dest="cmd")

    kind = _cmds.add_parser(
        "kind", help="Kubernetes-in-Docker (kind) cluster management."
    )

    kind_cmds = kind.add_subparsers(title="Commands", dest="sub_cmd")
    kind_create = kind_cmds.add_parser(
        "create", help="Create and setup a kind Kubernetes cluster."
    )
    kind_create.add_argument(
        "--recreate",
        action="store_true",
        help="If the cluster already exist, delete it and create a new.",
    )
    kind_delete = kind_cmds.add_parser(
        "delete", help="Stop and delete a previously started kind Kubernetes cluster."
    )

    upgrade = _cmds.add_parser(
        "upgrade", help="Install or upgrade the Helm chart in the Kubernetes cluster."
    )
    upgrade.add_argument(
        "--chart",
        default="./jupyterhub",
        help="Chart to upgrade/install with the upgrade helm upgrade command.",
    )
    upgrade.add_argument(
        "--version",
        help="Specifies the chart's version to upgrade/install.",
    )
    upgrade.add_argument(
        "-f",
        "--values",
        action="append",
        default=["dev-config.yaml"],
        help="A Helm values file, this argument can be passed multiple times.",
    )

    port_forward = _cmds.add_parser(
        "port-forward", help="Run kubectl port-forward on the deployed Helm chart's proxy-public service in a detached process."
    )

    test = _cmds.add_parser(
        "test", help="Run tests on the deployed Helm chart in the Kubernetes cluster."
    )

    check = _cmds.add_parser(
        "check", help="Run checks on your developed helm templates and python code."
    )
    check_cmds = check.add_subparsers(title="Commands", dest="sub_cmd")
    check_templates = check_cmds.add_parser(
        "templates",
        help="Run checks on the Helm templates and the Kubernetes resources they generate using: helm lint, helm templates, yamllint, and kubeval.",
    )
    check_python_code = check_cmds.add_parser(
        "python-code", help="Run checks on the python code using: black."
    )
    check_python_code.add_argument(
        "--apply",
        action="store_true",
        help="Apply autoformatting to the Python code files.",
    )

    changelog = _cmds.add_parser(
        "changelog",
        help="Generate a changelog since last release using: choldgraf/github-activity.",
    )

    return _


if __name__ == "__main__":
    # parse passed command line arguments
    argparser = _get_argparser()
    args = argparser.parse_args()
    
    # initialize defaults and load environment variables from the .env file
    if not os.path.exists(".env"):
        default_dotenv_file = textwrap.dedent(
            """\
            # Environment variables loaded and used by the ./dev script.
            #
            # Z2JH_ prefixed environment variables already defined will take
            # precedence if they are defined in the system already, while the
            # others are required to be explicitly set here.
            # -----------------------------------------------------------------
            #
            # GITHUB_ACCESS_TOKEN is needed to generate changelog entries etc.
            # For private repositories you don't have to give this token any
            # privileges when you create it here: https://github.com/settings/tokens/new
            #
            GITHUB_ACCESS_TOKEN=""

            # KUBECONFIG is required to be set explicitly in order to avoid
            # potential modifications of non developer clusters. It should
            # be to the path where the kubernetes config resides.
            #
            # The "./dev kind create" command will set this files KUBECONFIG
            # entry automatically on cluster creation.
            KUBECONFIG=""

            # Z2JH_KUBE_CONTEXT and Z2JH_KUBE_NAMESPACE is used to ensure we
            # work with the right cluster, with the right credentials, and in
            # the right namespace without modifying the provided KUBECONFIG.
            Z2JH_KUBE_CONTEXT=""
            Z2JH_KUBE_NAMESPACE=""

            # Z2JH_KUBE_VERSION is used to create a kind cluster. Note that only
            # versions that are found on kindest/node can be used.
            #
            # ref: https://hub.docker.com/r/kindest/node/tags
            Z2JH_KUBE_VERSION="1.15.3"

            # Z2JH_VALIDATE_KUBE_VERSIONS is influences "./dev check templates",
            # what Kubernetes versions do we validate against? Note that only
            # versions found on instrumenta/kubernetes-json-schema can be used.
            #
            # ref: https://github.com/instrumenta/kubernetes-json-schema
            Z2JH_VALIDATE_KUBE_VERSIONS="1.15.0"

            # Z2JH_PORT_FORWARD_ADDRESS and Z2JH_PORT_FORWARD_PORT influences
            # "./dev port-forward" and where "./dev test" will look to access
            # the proxy-public Kubernetes service.
            #
            Z2JH_PORT_FORWARD_ADDRESS="localhost"
            Z2JH_PORT_FORWARD_PORT="8080"
            """
        )
        with open('.env', 'w+') as f:
            f.write(default_dotenv_file)


    dotenv.load_dotenv(override=False)

    # let these environment values in the .env file override the system
    # environment variables, but let the user know if an override happen
    env_keys = ["GITHUB_ACCESS_TOKEN", "KUBECONFIG"]
    for env_key in env_keys:
        env_value_in_os = os.environ.get(env_key, None)
        env_value_in_file = dotenv.get_key(".env", env_key)
        if env_value_in_os and env_value_in_os != env_value_in_file:
            print(f"Warning: system's {env_key} value is ignored in favor of the .env file's value.")
        os.environ[env_key] = env_value_in_file

    # run suitable command and pass arguments
    if args.cmd == "kind":
        if args.sub_cmd == "create":
            kind_create(recreate=args.recreate)
        if args.sub_cmd == "delete":
            kind_delete()

    if args.cmd == "upgrade":
        upgrade(chart=args.chart, version=args.version, values=args.values)

    if args.cmd == "port-forward":
        port_forward()

    if args.cmd == "test":
        test()

    if args.cmd == "check":
        if args.sub_cmd == "templates":
            check_templates()
        if args.sub_cmd == "python-code":
            check_python_code(apply=args.apply)

    if args.cmd == "changelog":
        changelog()