MediaCrawler/proxy/proxy_ip_pool.py

# -*- coding: utf-8 -*-
# @Author  : relakkes@gmail.com
# @Time    : 2023/12/2 13:45
# @Desc    : ip代理池实现
import random
from typing import Dict, List

import httpx
from tenacity import retry, stop_after_attempt, wait_fixed

import config
from proxy.providers import new_jisu_http_proxy, new_kuai_daili_proxy
from tools import utils

from .base_proxy import ProxyProvider
from .types import IpInfoModel, ProviderNameEnum


class ProxyIpPool:
    def __init__(self, ip_pool_count: int, enable_validate_ip: bool, ip_provider: ProxyProvider) -> None:
        """

        Args:
            ip_pool_count:
            enable_validate_ip:
            ip_provider:
        """
        self.valid_ip_url = "https://httpbin.org/ip"  # 验证 IP 是否有效的地址
        self.ip_pool_count = ip_pool_count
        self.enable_validate_ip = enable_validate_ip
        self.proxy_list: List[IpInfoModel] = []
        self.ip_provider: ProxyProvider = ip_provider

    async def load_proxies(self) -> None:
        """
        加载IP代理
        Returns:

        """
        self.proxy_list = await self.ip_provider.get_proxies(self.ip_pool_count)

    async def _is_valid_proxy(self, proxy: IpInfoModel) -> bool:
        """
        验证代理IP是否有效
        :param proxy:
        :return:
        """
        utils.logger.info(f"[ProxyIpPool._is_valid_proxy] testing {proxy.ip} is it valid ")
        try:
            httpx_proxy = {
                f"{proxy.protocol}": f"http://{proxy.user}:{proxy.password}@{proxy.ip}:{proxy.port}"
            }
            async with httpx.AsyncClient(proxies=httpx_proxy) as client:
                response = await client.get(self.valid_ip_url)
            if response.status_code == 200:
                return True
            else:
                return False
        except Exception as e:
            utils.logger.info(f"[ProxyIpPool._is_valid_proxy] testing {proxy.ip} err: {e}")
            raise e

    @retry(stop=stop_after_attempt(3), wait=wait_fixed(1))
    async def get_proxy(self) -> IpInfoModel:
        """
        从代理池中随机提取一个代理IP
        :return:
        """
        if len(self.proxy_list) == 0:
            await self._reload_proxies()

        proxy = random.choice(self.proxy_list)
        self.proxy_list.remove(proxy) # 取出来一个IP就应该移出掉
        if self.enable_validate_ip:
            if not await self._is_valid_proxy(proxy):
                raise Exception("[ProxyIpPool.get_proxy] current ip invalid and again get it")
        return proxy

    async def _reload_proxies(self):
        """
        # 重新加载代理池
        :return:
        """
        self.proxy_list = []
        await self.load_proxies()


IpProxyProvider: Dict[str, ProxyProvider] = {
    ProviderNameEnum.JISHU_HTTP_PROVIDER.value: new_jisu_http_proxy(),
    ProviderNameEnum.KUAI_DAILI_PROVIDER.value: new_kuai_daili_proxy()
}


async def create_ip_pool(ip_pool_count: int, enable_validate_ip: bool) -> ProxyIpPool:
    """
     创建 IP 代理池
    :param ip_pool_count: ip池子的数量
    :param enable_validate_ip: 是否开启验证IP代理
    :return:
    """
    pool = ProxyIpPool(ip_pool_count=ip_pool_count,
                       enable_validate_ip=enable_validate_ip,
                       ip_provider=IpProxyProvider.get(config.IP_PROXY_PROVIDER_NAME)
                       )
    await pool.load_proxies()
    return pool


if __name__ == '__main__':
    pass