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import aiohttp
import asyncio
import click
import functools
def async_command(f):
def wrapper(*args, **kwargs):
loop = asyncio.get_event_loop()
return loop.run_until_complete(f(*args, **kwargs))
return functools.update_wrapper(wrapper, f)
def conn_command(f):
async def wrapper(*args, **kwargs):
from . import db
from . import settings
pool = await db.get_pool(settings.DB_DSN)
try:
async with pool.acquire() as conn:
kwargs["conn"] = conn
return await f(*args, **kwargs)
finally:
pool.close()
await pool.wait_closed()
return functools.update_wrapper(wrapper, f)
@click.group()
def cli():
pass
@cli.group()
def db():
"""
Database related commands (migrate, clear…)
"""
pass
@db.command()
@async_command
@conn_command
async def migrate(conn):
"""
Create database tables.
"""
from . import db
await db.create(conn)
@db.command()
@async_command
@conn_command
async def clear(conn):
"""
Drop database tables.
"""
from . import db
await db.clear(conn)
@cli.command()
def server():
"""
Start web server.
"""
from . import server
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async def launch_domain_poll(pool, session, domain):
from . import crawler
async with pool.acquire() as conn:
return await crawler.check(conn=conn, session=session, domain=domain)
@cli.command()
@click.argument("domain", type=str, nargs=-1, required=True)
@async_command
async def poll(domain):
"""
Retrieve and store data for the specified domains.
"""
from . import crawler
from . import db
from . import settings
pool = await db.get_pool(settings.DB_DSN)
try:
kwargs = crawler.get_session_kwargs()
async with aiohttp.ClientSession(**kwargs) as session:
tasks = [launch_domain_poll(pool, session, d) for d in domain]
return await asyncio.wait(tasks)
finally:
pool.close()
await pool.wait_closed()
def main():
cli()
if __name__ == "__main__":
main()