kombu 的惰性 connection ？

kombu 这套东西,到底是在哪里建立 amqp 连接的

from kombu import Connection
from kombu.pools import connections

connection = Connection('redis://localhost:6379')

with connections[connection].acquire(block=True) as conn:
    print('Got connection: {0!r}'.format(connection.as_uri()))

方法：人肉看代码，手动二分，加 wireshark 抓包

在这里加了一个断言
site-packages/kombu/transport/pyamqp.py

╰─➤  python 001.py                                           
Traceback (most recent call last):
  File "/Users/ponponon/Desktop/code/me/test_nameko_for_rabbitmq/001.py", line 11, in 
    conn.connect()
  File "/Users/ponponon/.local/share/virtualenvs/test_nameko_for_rabbitmq-Kw9_vVsf/lib/python3.10/site-packages/kombu/connection.py", line 274, in connect
    c=self._ensure_connection(
  File "/Users/ponponon/.local/share/virtualenvs/test_nameko_for_rabbitmq-Kw9_vVsf/lib/python3.10/site-packages/kombu/connection.py", line 436, in _ensure_connection
    return retry_over_time(
  File "/Users/ponponon/.local/share/virtualenvs/test_nameko_for_rabbitmq-Kw9_vVsf/lib/python3.10/site-packages/kombu/utils/functional.py", line 312, in retry_over_time
    return fun(*args, **kwargs)
  File "/Users/ponponon/.local/share/virtualenvs/test_nameko_for_rabbitmq-Kw9_vVsf/lib/python3.10/site-packages/kombu/connection.py", line 880, in _connection_factory
    self._connection = self._establish_connection()
  File "/Users/ponponon/.local/share/virtualenvs/test_nameko_for_rabbitmq-Kw9_vVsf/lib/python3.10/site-packages/kombu/connection.py", line 815, in _establish_connection
    conn = self.transport.establish_connection()
  File "/Users/ponponon/.local/share/virtualenvs/test_nameko_for_rabbitmq-Kw9_vVsf/lib/python3.10/site-packages/kombu/transport/pyamqp.py", line 199, in establish_connection
    assert False
AssertionError