ipv6 address parsing error in postgresql conn string

[sreenandan]

For ipv6 addresses from https://www.postgresql.org/docs/10/libpq-connect.html we can use square brackets around ipv6 address, but it looks like there is a bug in parsing.

import asyncpg
import asyncio

async def run():
    conn = await asyncpg.connect(f"postgresql://postgres:patron@[fd74:ca9b:3a09:868c:0010:0009:0114:0067]:6321/postgres?sslmode=prefer")
    await conn.close()

asyncio.run(run())

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.7/asyncio/runners.py", line 43, in run
    return loop.run_until_complete(main)
  File "/usr/local/lib/python3.7/asyncio/base_events.py", line 568, in run_until_complete
    return future.result()
  File "<stdin>", line 2, in run
  File "/usr/local/lib/python3.7/site-packages/asyncpg/connection.py", line 1727, in connect
    max_cacheable_statement_size=max_cacheable_statement_size)
  File "/usr/local/lib/python3.7/site-packages/asyncpg/connect_utils.py", line 656, in _connect
    addrs, params, config = _parse_connect_arguments(timeout=timeout, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/asyncpg/connect_utils.py", line 497, in _parse_connect_arguments
    server_settings=server_settings)
  File "/usr/local/lib/python3.7/site-packages/asyncpg/connect_utils.py", line 237, in _parse_connect_dsn_and_args
    host, port = _parse_hostlist(dsn_hostspec, port, unquote=True)
  File "/usr/local/lib/python3.7/site-packages/asyncpg/connect_utils.py", line 197, in _parse_hostlist
    hostlist_ports.append(int(hostspec_port))
ValueError: invalid literal for int() with base 10: 'ca9b:3a09:868c:0010:0009:0114:0067]:6321'`



$ pip show asyncpg
Name: asyncpg
Version: 0.21.0
Summary: An asyncio PostgreSQL driver
Home-page: https://github.com/MagicStack/asyncpg
Author: MagicStack Inc
Author-email: hello@magic.io
License: Apache License, Version 2.0
Location: /usr/local/lib/python3.7/site-packages
Requires: 
Required-by: 

$ postgresql version 13

This works:

async def run():
    conn = await asyncpg.connect(
        user="postgres",
        password="patron",
        host="fd74:ca9b:3a09:868c:0010:0009:0114:0067",
        port=6321,
        database="postgres",
        ssl="prefer"
    )
    await conn.close()