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from __future__ import annotations
import asyncio
import json
import sys
import click
import yaml
from distributed._signals import wait_for_signals
from distributed.compatibility import asyncio_run
from distributed.config import get_loop_factory
from distributed.deploy.spec import init_spec
@click.command(name="spec", context_settings=dict(ignore_unknown_options=True))
@click.argument("args", nargs=-1)
@click.option("--spec", type=str, default="", help="")
@click.option("--spec-file", type=str, default=None, help="")
@click.version_option()
def main(args: list, spec: str, spec_file: str) -> None:
"""Launch a Dask process defined by a JSON/YAML specification"""
if spec and spec_file or not spec and not spec_file:
print("Must specify exactly one of --spec and --spec-file")
sys.exit(1)
_spec = {}
if spec_file:
with open(spec_file) as f:
_spec.update(yaml.safe_load(f))
if spec:
_spec.update(json.loads(spec))
if "cls" in _spec: # single worker spec
_spec = {_spec["opts"].get("name", 0): _spec}
async def run() -> None:
servers = init_spec(_spec, *args)
async def wait_for_servers_to_finish() -> None:
await asyncio.gather(*servers.values())
await asyncio.gather(*(w.finished() for w in servers.values()))
async def wait_for_signals_and_close() -> None:
await wait_for_signals()
await asyncio.gather(*(w.close() for w in servers.values()))
wait_for_signals_and_close_task = asyncio.create_task(
wait_for_signals_and_close()
)
wait_for_servers_to_finish_task = asyncio.create_task(
wait_for_servers_to_finish()
)
done, _ = await asyncio.wait(
[wait_for_signals_and_close_task, wait_for_servers_to_finish_task],
return_when=asyncio.FIRST_COMPLETED,
)
# Re-raise exceptions from done tasks
[task.result() for task in done]
asyncio_run(run(), loop_factory=get_loop_factory())
if __name__ == "__main__":
main()
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