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81 lines
2.5 KiB
Python
81 lines
2.5 KiB
Python
#
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# Copyright (C) 2022-present ScyllaDB
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#
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# SPDX-License-Identifier: AGPL-3.0-or-later
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#
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import time
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import asyncio
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import logging
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from typing import Callable, Awaitable, Optional, TypeVar, Generic
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from cassandra.cluster import NoHostAvailable, Session # type: ignore # pylint: disable=no-name-in-module
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from cassandra.pool import Host # type: ignore # pylint: disable=no-name-in-module
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from test.pylib.internal_types import ServerInfo
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class LogPrefixAdapter(logging.LoggerAdapter):
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def process(self, msg, kwargs):
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return '[%s] %s' % (self.extra['prefix'], msg), kwargs
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unique_name_prefix = 'test_'
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T = TypeVar('T')
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def unique_name():
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current_ms = int(round(time.time() * 1000))
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# If unique_name() is called twice in the same millisecond...
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if unique_name.last_ms >= current_ms:
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current_ms = unique_name.last_ms + 1
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unique_name.last_ms = current_ms
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return unique_name_prefix + str(current_ms)
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async def wait_for(
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pred: Callable[[], Awaitable[Optional[T]]],
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deadline: float, period: float = 1) -> T:
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while True:
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assert(time.time() < deadline), "Deadline exceeded, failing test."
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res = await pred()
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if res is not None:
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return res
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await asyncio.sleep(period)
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async def wait_for_cql(cql: Session, host: Host, deadline: float) -> None:
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async def cql_ready():
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try:
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await cql.run_async("select * from system.local", host=host)
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except NoHostAvailable:
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logging.info(f"Driver not connected to {host} yet")
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return None
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return True
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await wait_for(cql_ready, deadline)
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async def wait_for_cql_and_get_hosts(cql: Session, servers: list[ServerInfo], deadline: float) \
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-> list[Host]:
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"""Wait until every server in `servers` is available through `cql`
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and translate `servers` to a list of Cassandra `Host`s.
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"""
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ip_set = set(str(srv.ip_addr) for srv in servers)
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async def get_hosts() -> Optional[list[Host]]:
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hosts = cql.cluster.metadata.all_hosts()
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remaining = ip_set - {h.address for h in hosts}
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if not remaining:
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return hosts
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logging.info(f"Driver hasn't yet learned about hosts: {remaining}")
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return None
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hosts = await wait_for(get_hosts, deadline)
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# Take only hosts from `ip_set` (there may be more)
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hosts = [h for h in hosts if h.address in ip_set]
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await asyncio.gather(*(wait_for_cql(cql, h, deadline) for h in hosts))
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return hosts
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unique_name.last_ms = 0
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