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#!/usr/bin/env python3 |
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"""Start Kytos SDN Platform core.""" |
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import asyncio |
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import functools |
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import os |
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import signal |
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from concurrent.futures import ThreadPoolExecutor |
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from pathlib import Path |
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import daemon |
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from IPython.terminal.embed import InteractiveShellEmbed |
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from IPython.terminal.prompts import Prompts, Token |
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from traitlets.config.loader import Config |
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from kytos.core import Controller |
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from kytos.core.config import KytosConfig |
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from kytos.core.metadata import __version__ |
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BASE_ENV = Path(os.environ.get('VIRTUAL_ENV', '/')) |
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class KytosPrompt(Prompts): |
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"""Configure Kytos prompt for interactive shell.""" |
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def in_prompt_tokens(self): |
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"""Kytos IPython prompt.""" |
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return [(Token.Prompt, 'kytos $> ')] |
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def _create_pid_dir(): |
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"""Create the directory in /var/run to hold the pidfile.""" |
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pid_dir = os.path.join(BASE_ENV, 'var/run/kytos') |
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os.makedirs(pid_dir, exist_ok=True) |
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if BASE_ENV == '/': # system install |
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os.chmod(pid_dir, 0o1777) # permissions like /tmp |
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def start_shell(controller=None): |
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"""Load Kytos interactive shell.""" |
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documentation = "https://github.com/kytos-ng/" \ |
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"documentation/tree/master/tutorials/napps" |
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kytos_ascii = r""" |
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_ __ _ |
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| | / / | | |
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| |/ / _ _| |_ ___ ___ _ __ __ _ |
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| \| | | | __/ _ \/ __| ______ | '_ \ / _` | |
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| |\ \ |_| | || (_) \__ \|______|| | | | (_| | |
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\_| \_/\__, |\__\___/|___/ |_| |_|\__, | |
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__/ | __/ | |
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|___/ |___/ |
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""" |
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banner1 = f"""\033[95m{kytos_ascii}\033[0m |
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Welcome to Kytos SDN Platform! |
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Kytos website.: https://kytos-ng.github.io/about/ |
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Documentation.: {documentation} |
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OF Address....:""" |
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exit_msg = "Stopping Kytos daemon... Bye, see you!" |
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if controller: |
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address = controller.server.server_address[0] |
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port = controller.server.server_address[1] |
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banner1 += f" tcp://{address}:{port}\n" |
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api_port = controller.api_server.port |
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banner1 += f" WEB UI........: http://{address}:{api_port}/\n" |
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banner1 += f" Kytos Version.: {__version__}" |
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banner1 += "\n" |
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cfg = Config() |
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cfg.TerminalInteractiveShell.autocall = 2 |
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cfg.TerminalInteractiveShell.show_rewritten_input = False |
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cfg.TerminalInteractiveShell.confirm_exit = False |
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# Avoiding sqlite3.ProgrammingError when trying to save command history |
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# on Kytos shutdown |
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cfg.HistoryAccessor.enabled = False |
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ipshell = InteractiveShellEmbed(config=cfg, |
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banner1=banner1, |
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exit_msg=exit_msg) |
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ipshell.prompts = KytosPrompt(ipshell) |
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ipshell() |
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def main(): |
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"""Read config and start Kytos in foreground or daemon mode.""" |
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# data_files is not enough when installing from PyPI |
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_create_pid_dir() |
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config = KytosConfig().options['daemon'] |
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if config.foreground or not config.daemon: |
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async_main(config) |
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else: |
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with daemon.DaemonContext(): |
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async_main(config) |
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def stop_controller(controller, shell_task=None): |
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"""Stop the controller before quitting.""" |
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loop = asyncio.get_running_loop() |
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if loop: |
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# If stop() hangs, old ctrl+c behaviour will be restored |
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loop.remove_signal_handler(signal.SIGINT) |
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loop.remove_signal_handler(signal.SIGTERM) |
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controller.log.info("Stopping Kytos controller...") |
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controller.stop() |
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if shell_task: |
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shell_task.cancel() |
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def stop_controller_sys_exit(controller, config, shell_task=None): |
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"""Stop the controller while handling sys exit.""" |
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controller.stop() |
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if shell_task: |
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try: |
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shell_task.cancel() |
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except asyncio.CancelledError: |
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pass |
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try: |
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with open(config.pidfile, "r") as f: |
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pid = int(f.read().strip()) |
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os.kill(pid, signal.SIGTERM.value) |
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except (FileNotFoundError, OSError): |
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pass |
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async def start_shell_async(controller, executor): |
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"""Run the shell inside a thread and stop controller when done.""" |
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_start_shell = functools.partial(start_shell, controller) |
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loop = asyncio.get_running_loop() |
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try: |
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data = await loop.run_in_executor(executor, _start_shell) |
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finally: |
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stop_controller(controller) |
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return data |
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def async_main(config): |
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"""Start main Kytos Daemon with asyncio loop.""" |
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loop = asyncio.new_event_loop() |
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asyncio.set_event_loop(loop) |
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controller = Controller(config, loop) |
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if controller.options.debug: |
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loop.set_debug(True) |
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loop.call_soon(controller.start) |
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shell_task = None |
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if controller.options.foreground: |
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executor = ThreadPoolExecutor(max_workers=1) |
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shell_task = loop.create_task(start_shell_async(controller, executor)) |
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kill_handler = functools.partial(stop_controller, controller, shell_task) |
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loop.add_signal_handler(signal.SIGINT, kill_handler) |
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loop.add_signal_handler(signal.SIGTERM, kill_handler) |
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try: |
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loop.run_forever() |
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except SystemExit as exc: |
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print(exc) |
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print("Shutting down Kytos...") |
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loop.remove_signal_handler(signal.SIGINT) |
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loop.remove_signal_handler(signal.SIGTERM) |
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stop_controller_sys_exit(controller, config, shell_task) |
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finally: |
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loop.close() |
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kytos-ng /
kytos
