# Copyright 2022-2026 Xinference Holdings Pte. Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import functools
import ipaddress
import logging
import os

logger = logging.getLogger(__name__)

try:
    from vllm.engine.async_llm_engine import AsyncEngineDeadError
except Exception:
    # vLLM 0.19.0+ removed AsyncEngineDeadError from this module.
    # It is a subclass of RuntimeError, so except RuntimeError suffices.
    # Use except Exception (not just ImportError) to handle partial/broken
    # vllm installations where module init may raise non-ImportError errors.
    AsyncEngineDeadError = RuntimeError  # type: ignore[assignment,misc]


def vllm_check(fn):
    @functools.wraps(fn)
    async def _async_wrapper(self, *args, **kwargs):
        try:
            return await fn(self, *args, **kwargs)
        except AsyncEngineDeadError:
            logger.info("Detecting vLLM is not health, prepare to quit the process")
            try:
                self.stop()
            except Exception:
                # ignore error when stop
                pass
            # Just kill the process and let xinference auto-recover the model
            os._exit(1)

    return _async_wrapper


def get_distributed_init_method(ip: str, port: int) -> str:
    return get_tcp_uri(ip, port)


def get_tcp_uri(ip: str, port: int) -> str:
    if is_valid_ipv6_address(ip):
        return f"tcp://[{ip}]:{port}"  # noqa E231
    else:
        return f"tcp://{ip}:{port}"  # noqa E231


def is_valid_ipv6_address(address: str) -> bool:
    try:
        ipaddress.IPv6Address(address)
        return True
    except ValueError:
        return False
