tasks.py

from __future__ import print_function
import os
import sys
import shutil
from distutils.dir_util import copy_tree
from distutils.file_util import copy_file

import invoke
from invoke import task

from yaksh.settings import SERVER_POOL_PORT

SCRIPT_DIR = os.path.abspath(os.path.dirname(__file__))
TARGET_CONTAINER_NAME = 'yaksh_code_server'
SRC_IMAGE_NAME = 'fossee/yaksh_codeserver'
CHECK_FILE = 'server_running.txt'
CHECK_FILE_PATH = os.path.join(SCRIPT_DIR, 'yaksh_data', CHECK_FILE)
OS_NAME = sys.platform


def create_dir(path):
    if not os.path.exists(path):
        os.makedirs(path)


def remove_check_file(path):
    if os.path.isfile(path):
        os.remove(path)


def remove_dir(path):
    if os.path.isdir(path):
        shutil.rmtree(path)


def run_as(os_name):
    if (os_name.startswith('linux') or os_name == 'darwin' or
            os_name.startswith('freebsd')):
        return 'sudo'
    else:  # For os_name = 'Win32'
        return None


def get_cmd(run_as_cmd, base_cmd):
    if run_as_cmd:
        return '{0} {1}'.format(run_as_cmd, base_cmd)
    else:
        return base_cmd


@task
def setupdb(ctx):
    print("** Setting up & migrating database **")
    ctx.run("python manage.py makemigrations")
    ctx.run("python manage.py migrate")
    print("** Done! Migrations complete **")


@task
def loadfixtures(ctx):
    print("** Loading fixtures into database **")
    ctx.run("python manage.py loaddata demo_fixtures.json")
    print("** Done! Loaded fixtures into database **")


@task(setupdb, loadfixtures)
def serve(ctx):
    print("** Running the Django web server. Press Ctrl-C to Exit **")
    ctx.run("python manage.py runserver")


@task
def clean(ctx):
    print("** Discarding database **")
    remove_check_file(os.path.join(SCRIPT_DIR, 'db.sqlite3'))


@task
def getimage(ctx, image=SRC_IMAGE_NAME):
    try:
        base_cmd = "docker inspect {0}".format(image)
        run_as_cmd = run_as(OS_NAME)
        cmd = get_cmd(run_as_cmd, base_cmd)
        ctx.run(cmd, hide=True)
    except invoke.exceptions.Failure:
        print("The docker image {0} does not exist locally".format(image))
        print("\n** Pulling latest image <{0}> from docker hub **".format(
            image)
        )
        base_cmd = "docker pull {0}".format(image)
        run_as_cmd = run_as(OS_NAME)
        cmd = get_cmd(run_as_cmd, base_cmd)
        ctx.run(cmd)
        print("\n** Done! Successfully pulled latest image <{0}> **".format(
            image)
        )


@task
def start(ctx, ports=SERVER_POOL_PORT, image=SRC_IMAGE_NAME, unsafe=False,
          version=3):
    if unsafe:
        with ctx.cd(SCRIPT_DIR):
            print("** Initializing local code server **")
            base_cmd = "python{0} -m yaksh.code_server".format(
                version
            )
            run_as_cmd = run_as(OS_NAME)
            cmd = get_cmd(run_as_cmd, base_cmd)
            ctx.run(cmd)
    else:
        cmd_params = {
            'ports': ports, 'image': SRC_IMAGE_NAME,
            'name': TARGET_CONTAINER_NAME,
            'vol_mount': os.path.join(SCRIPT_DIR, 'yaksh_data'),
            'command': 'sh {0}'.format(
                os.path.join(
                    SCRIPT_DIR,
                    'yaksh_data', 'yaksh', 'scripts', 'yaksh_script.sh')
                )
            }

        remove_check_file(CHECK_FILE_PATH)
        getimage(ctx, image=SRC_IMAGE_NAME)

        print("** Preparing code server **")
        create_dir(os.path.join(SCRIPT_DIR, 'yaksh_data', 'data'))
        create_dir(os.path.join(SCRIPT_DIR, 'yaksh_data', 'output'))

        copy_tree(
            os.path.join(SCRIPT_DIR, 'yaksh'),
            os.path.join(SCRIPT_DIR, 'yaksh_data', 'yaksh')
        )

        copy_file(
            os.path.join(SCRIPT_DIR, 'requirements',
                         'requirements-codeserver.txt'),
            os.path.join(SCRIPT_DIR, 'yaksh_data')
        )

        print("** Initializing code server within docker container **")
        base_cmd = "docker run \
            -dp {ports}:{ports} --name={name} \
            -v {vol_mount}:{vol_mount} \
            -w {vol_mount} \
            {image} {command}".format(**cmd_params)
        run_as_cmd = run_as(OS_NAME)
        cmd = get_cmd(run_as_cmd, base_cmd)
        ctx.run(cmd)

        while not os.path.isfile(CHECK_FILE_PATH):
            print("** Checking code server status. Press Ctrl-C to exit **\r",
                  end="")
        print("\n** Code server is up and running successfully **")


@task
def stop(ctx, container=TARGET_CONTAINER_NAME, hide=True):
    base_filter_cmd = "docker ps -q --filter='name={0}'".format(container)
    run_as_cmd = run_as(OS_NAME)
    cmd = get_cmd(run_as_cmd, base_filter_cmd)
    result = ctx.run(cmd)

    remove_check_file(CHECK_FILE_PATH)
    if result.stdout:
        print("** Stopping the docker container <{0}> **".format(container))
        base_stop_cmd = "docker stop {0}".format(container)
        cmd = get_cmd(run_as_cmd, base_stop_cmd)
        ctx.run(cmd)
        print("** Done! Stopped the docker container <{0}> **".format(
              container))

        print("** Discarding the docker container <{0}> **".format(container))
        base_rm_cmd = "docker rm {0}".format(container)
        cmd = get_cmd(run_as_cmd, base_rm_cmd)
        ctx.run(cmd)
        print("** Done! Discarded the docker container <{0}> **".format(
            container))
    else:
        print("** Docker container <{0}> not found **".format(container))


# Docker compose based deployment
@task
def build(ctx):
    run_as_cmd = run_as(OS_NAME)

    copy_tree(
        os.path.join(SCRIPT_DIR, 'requirements'),
        os.path.join(SCRIPT_DIR, 'docker', 'Files')
    )

    base_build_cmd = "docker-compose build --no-cache"
    cmd = get_cmd(run_as_cmd, base_build_cmd)
    print("** Building docker images **")
    ctx.run(cmd)
    print("** Done! Built the docker images **")

    base_build_cmd = "docker pull mariadb:10.2 "
    cmd = get_cmd(run_as_cmd, base_build_cmd)
    print("** Pulling maria-db base image **")
    ctx.run(cmd)
    print("** Done! Pulled maria-db base image **")


@task
def begin(ctx):
    print("** Initializing docker containers **")
    base_cmd = "docker-compose up -d"
    run_as_cmd = run_as(OS_NAME)
    cmd = get_cmd(run_as_cmd, base_cmd)
    ctx.run(cmd)
    print("** Done! Initialized the docker containers **")


@task
def deploy(ctx, fixtures=False, static=True):
    run_as_cmd = run_as(OS_NAME)

    print("** Setting up & migrating database **")
    base_make_migrate_cmd = "docker exec -i yaksh_django" \
        " python3 manage.py makemigrations"
    cmd = get_cmd(run_as_cmd, base_make_migrate_cmd)
    ctx.run(cmd)

    base_migrate_cmd = "docker exec -i yaksh_django" \
        " python3 manage.py migrate"
    cmd = get_cmd(run_as_cmd, base_migrate_cmd)
    ctx.run(cmd)
    print("** Done! Migrations complete **")

    if fixtures:
        base_fixture_cmd = "docker exec -i yaksh_django" \
            " python3 manage.py loaddata demo_fixtures.json"
        cmd = get_cmd(run_as_cmd, base_fixture_cmd)
        print("** Loading fixtures into database **")
        ctx.run(cmd)
        print("** Done! Loaded fixtures into database **")

    if static:
        base_static_cmd = "docker exec -i yaksh_django " \
            "python3 manage.py collectstatic"
        cmd = get_cmd(run_as_cmd, base_static_cmd)
        print("** Setting up static assets **")
        ctx.run(cmd)
        print("** Done! Set up static assets **")


@task
def status(ctx):
    run_as_cmd = run_as(OS_NAME)
    base_cmd = "docker-compose ps"
    cmd = get_cmd(run_as_cmd, base_cmd)
    print("** Fetching container status **")
    ctx.run(cmd)


@task
def halt(ctx):
    run_as_cmd = run_as(OS_NAME)
    base_cmd = "docker-compose stop"
    cmd = get_cmd(run_as_cmd, base_cmd)
    print("** Stopping containers **")
    ctx.run(cmd)
    print("** Done! Stopped containers **")


@task
def restart(ctx):
    run_as_cmd = run_as(OS_NAME)
    base_cmd = "docker-compose restart"
    cmd = get_cmd(run_as_cmd, base_cmd)
    print("** Restarting containers **")
    ctx.run(cmd)
    print("** Done! Restarted containers **")


@task(halt)
def remove(ctx):
    run_as_cmd = run_as(OS_NAME)
    base_cmd = "docker-compose rm --force"
    cmd = get_cmd(run_as_cmd, base_cmd)
    sql_dir = os.path.join(SCRIPT_DIR, 'docker', 'mysql')
    print("** Removing containers **")
    remove_dir(sql_dir)
    ctx.run(cmd)
    print("** Done! Removed containers **")