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# -*- coding: utf-8 eval: (blacken-mode 1) -*-
# SPDX-License-Identifier: GPL-2.0-or-later
#
# September 2 2021, Christian Hopps <chopps@labn.net>
#
# Copyright 2021, LabN Consulting, L.L.C.
#
"""The main function for standalone operation."""
import argparse
import asyncio
import logging
import logging.config
import os
import subprocess
import sys
from . import cli
from . import parser
from .base import get_event_loop
from .cleanup import cleanup_previous
from .compat import PytestConfig
logger = None
async def forever():
while True:
await asyncio.sleep(3600)
async def run_and_wait(args, unet):
tasks = []
if not args.topology_only:
# add the cmd.wait()s returned from unet.run()
tasks += await unet.run()
if sys.stdin.isatty() and not args.no_cli:
# Run an interactive CLI
task = cli.async_cli(unet)
else:
if args.no_wait:
logger.info("Waiting for all node cmd to complete")
task = asyncio.gather(*tasks, return_exceptions=True)
else:
logger.info("Waiting on signal to exit")
task = asyncio.create_task(forever())
task = asyncio.gather(task, *tasks, return_exceptions=True)
try:
await task
finally:
# Basically we are canceling tasks from unet.run() which are just async calls to
# node.cmd_p.wait() so we've stopped waiting for them to complete, but not
# actually canceld/killed the cmd_p process.
for task in tasks:
task.cancel()
async def async_main(args, config):
status = 3
# Setup the namespaces and network addressing.
unet = await parser.async_build_topology(
config, rundir=args.rundir, args=args, pytestconfig=PytestConfig(args)
)
logger.info("Topology up: rundir: %s", unet.rundir)
try:
status = await run_and_wait(args, unet)
except KeyboardInterrupt:
logger.info("Exiting, received KeyboardInterrupt in async_main")
except asyncio.CancelledError as ex:
logger.info("task canceled error: %s cleaning up", ex)
except Exception as error:
logger.info("Exiting, unexpected exception %s", error, exc_info=True)
else:
logger.info("Exiting normally")
logger.debug("main: async deleting")
try:
await unet.async_delete()
except KeyboardInterrupt:
status = 2
logger.warning("Received KeyboardInterrupt while cleaning up.")
except Exception as error:
status = 2
logger.info("Deleting, unexpected exception %s", error, exc_info=True)
return status
def main(*args):
ap = argparse.ArgumentParser(args)
cap = ap.add_argument_group(title="Config", description="config related options")
cap.add_argument("-c", "--config", help="config file (yaml, toml, json, ...)")
cap.add_argument(
"-d", "--rundir", help="runtime directory for tempfiles, logs, etc"
)
cap.add_argument(
"--kinds-config",
help="kinds config file, overrides default search (yaml, toml, json, ...)",
)
cap.add_argument(
"--project-root", help="directory to stop searching for kinds config at"
)
rap = ap.add_argument_group(title="Runtime", description="runtime related options")
rap.add_argument(
"-C",
"--cleanup",
action="store_true",
help="Remove the entire rundir (not just node subdirs) prior to running.",
)
rap.add_argument(
"--gdb", metavar="NODE-LIST", help="comma-sep list of hosts to run gdb on"
)
rap.add_argument(
"--gdb-breakpoints",
metavar="BREAKPOINT-LIST",
help="comma-sep list of breakpoints to set",
)
rap.add_argument(
"--host",
action="store_true",
help="no isolation for top namespace, bridges exposed to default namespace",
)
rap.add_argument(
"--pcap",
metavar="TARGET-LIST",
help="comma-sep list of capture targets (NETWORK or NODE:IFNAME)",
)
rap.add_argument(
"--shell", metavar="NODE-LIST", help="comma-sep list of nodes to open shells on"
)
rap.add_argument(
"--stderr",
metavar="NODE-LIST",
help="comma-sep list of nodes to open windows viewing stderr",
)
rap.add_argument(
"--stdout",
metavar="NODE-LIST",
help="comma-sep list of nodes to open windows viewing stdout",
)
rap.add_argument(
"--topology-only",
action="store_true",
help="Do not run any node commands",
)
rap.add_argument("--unshare-inline", action="store_true", help=argparse.SUPPRESS)
rap.add_argument(
"--validate-only",
action="store_true",
help="Validate the config against the schema definition",
)
rap.add_argument("-v", "--verbose", action="store_true", help="be verbose")
rap.add_argument(
"-V", "--version", action="store_true", help="print the verison number and exit"
)
eap = ap.add_argument_group(title="Uncommon", description="uncommonly used options")
eap.add_argument("--log-config", help="logging config file (yaml, toml, json, ...)")
eap.add_argument(
"--no-kill",
action="store_true",
help="Do not kill previous running processes",
)
eap.add_argument(
"--no-cli", action="store_true", help="Do not run the interactive CLI"
)
eap.add_argument("--no-wait", action="store_true", help="Exit after commands")
args = ap.parse_args()
if args.version:
from importlib import metadata # pylint: disable=C0415
print(metadata.version("munet"))
sys.exit(0)
rundir = args.rundir if args.rundir else "/tmp/munet"
args.rundir = rundir
if args.cleanup:
if os.path.exists(rundir):
if not os.path.exists(f"{rundir}/config.json"):
logging.critical(
'unsafe: won\'t clean up rundir "%s" as '
"previous config.json not present",
rundir,
)
sys.exit(1)
else:
subprocess.run(["/usr/bin/rm", "-rf", rundir], check=True)
subprocess.run(f"mkdir -p {rundir} && chmod 755 {rundir}", check=True, shell=True)
os.environ["MUNET_RUNDIR"] = rundir
parser.setup_logging(args)
global logger # pylint: disable=W0603
logger = logging.getLogger("munet")
config = parser.get_config(args.config)
logger.info("Loaded config from %s", config["config_pathname"])
if not config["topology"]["nodes"]:
logger.critical("No nodes defined in config file")
return 1
if not args.no_kill:
cleanup_previous()
loop = None
status = 4
try:
parser.validate_config(config, logger, args)
if args.validate_only:
return 0
# Executes the cmd for each node.
loop = get_event_loop()
status = loop.run_until_complete(async_main(args, config))
except KeyboardInterrupt:
logger.info("Exiting, received KeyboardInterrupt in main")
except Exception as error:
logger.info("Exiting, unexpected exception %s", error, exc_info=True)
finally:
if loop:
loop.close()
return status
if __name__ == "__main__":
exit_status = main()
sys.exit(exit_status)
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