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爬虫代理 IP 池及隧道代理(2022.05.24)

2022-05-24 分类：野生技术 阅读(296) 评论(0)

爬虫代理 IP 池及隧道代理

目录

  • 爬虫代理 IP 池及隧道代理
    • 1. 代理 IP 池
      • 1.1 简介
      • 1.2 实现
      • 1.3 测试
    • 2. 隧道代理
      • 2.1 简介
      • 2.2 实现
        • 2.2.1 目录结构
        • 2.2.2 配置文件
        • 2.2.3 openresty
      • 2.3 测试

日常开发中，偶尔会遇到爬取网页数据的需求，为了隐藏本机真实 IP，常常会用到代理 IP 池，本文将基于 openresty 与代理 IP 池搭建更为易用的隧道代理。

1. 代理 IP 池

1.1 简介

代理 IP 池即在数据库中维护一个可用的 IP 代理队列，一般实现思路如下：

  1. 定时从免费或收费代理网站获取代理 IP 列表；
  2. 将代理 IP 列表以 Hash 结构存入 Redis；
  3. 定时检测代理 IP 的可用性，剔除不可用的代理 IP；
  4. 对外提供 API 接口用来管理代理 IP 池；

1.2 实现

此处笔者采用的开源项目jhao104/proxy_pool，具体实现方式参考其文档。

1.3 测试

import json

import requests
from retrying import retry


def get_proxy_ip() -> str:
    resp = requests.get(url=\"http://192.168.0.121:5010/get\")
    assert resp.status_code == 200
    return f\"http://{json.loads(resp.text)[\'proxy\']}\"


@retry(stop_max_attempt_number=5)
def proxy_test() -> None:
    resp = requests.get(url=\"http://httpbin.org/get\", proxies={\"http\": get_proxy_ip()}, timeout=5)
    assert resp.status_code == 200
    print(f\"origin: {json.loads(resp.text)[\'origin\']}\")


if __name__ == \"__main__\":
    try:
        proxy_test()
    except Exception as e:
        print(f\"Error: {e}.\")

2. 隧道代理

2.1 简介

通过代理 IP 池实现了隐藏本机真实 IP，但每次需要通过 API 接口获取新的代理 IP，不太方便，所以出现了隧道代理。隧道代理内部自动将请求通过不同的代理 IP 进行转发，对外提供统一的代理地址。

2.2 实现

此处笔者通过 openresty 配合上文搭建的代理 IP 池实现隧道代理。

2.2.1 目录结构

openresty
├── conf.d
│   └── tunnel-proxy.stream
├── docker.sh
└── nginx.conf

2.2.2 配置文件

  1. nginx.conf 文件为 openresty 的主配置文件，主要修改为引入了 stream 相关的配置文件，具体内容如下：

    # nginx.conf  --  docker-openresty
#
# This file is installed to:
#   `/usr/local/openresty/nginx/conf/nginx.conf`
# and is the file loaded by nginx at startup,
# unless the user specifies otherwise.
#
# It tracks the upstream OpenResty\'s `nginx.conf`, but removes the `server`
# section and adds this directive:
#     `include /etc/nginx/conf.d/*.conf;`
#
# The `docker-openresty` file `nginx.vh.default.conf` is copied to
# `/etc/nginx/conf.d/default.conf`.  It contains the `server section
# of the upstream `nginx.conf`.
#
# See https://github.com/openresty/docker-openresty/blob/master/README.md#nginx-config-files
#

#user  nobody;
#worker_processes 1;

# Enables the use of JIT for regular expressions to speed-up their processing.
pcre_jit on;



#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    # Enables or disables the use of underscores in client request header fields.
    # When the use of underscores is disabled, request header fields whose names contain underscores are marked as invalid and become subject to the ignore_invalid_headers directive.
    # underscores_in_headers off;

    #log_format  main  \'$remote_addr - $remote_user [$time_local] \"$request\" \'
    #                  \'$status $body_bytes_sent \"$http_referer\" \'
    #                  \'\"$http_user_agent\" \"$http_x_forwarded_for\"\';

    #access_log  logs/access.log  main;

        # Log in JSON Format
        # log_format nginxlog_json escape=json \'{ \"timestamp\": \"$time_iso8601\", \'
        # \'\"remote_addr\": \"$remote_addr\", \'
        #  \'\"body_bytes_sent\": $body_bytes_sent, \'
        #  \'\"request_time\": $request_time, \'
        #  \'\"response_status\": $status, \'
        #  \'\"request\": \"$request\", \'
        #  \'\"request_method\": \"$request_method\", \'
        #  \'\"host\": \"$host\",\'
        #  \'\"upstream_addr\": \"$upstream_addr\",\'
        #  \'\"http_x_forwarded_for\": \"$http_x_forwarded_for\",\'
        #  \'\"http_referrer\": \"$http_referer\", \'
        #  \'\"http_user_agent\": \"$http_user_agent\", \'
        #  \'\"http_version\": \"$server_protocol\", \'
        #  \'\"nginx_access\": true }\';
        # access_log /dev/stdout nginxlog_json;

    # See Move default writable paths to a dedicated directory (#119)
    # https://github.com/openresty/docker-openresty/issues/119
    client_body_temp_path /var/run/openresty/nginx-client-body;
    proxy_temp_path       /var/run/openresty/nginx-proxy;
    fastcgi_temp_path     /var/run/openresty/nginx-fastcgi;
    uwsgi_temp_path       /var/run/openresty/nginx-uwsgi;
    scgi_temp_path        /var/run/openresty/nginx-scgi;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    include /etc/nginx/conf.d/*.conf;

    # Don\'t reveal OpenResty version to clients.
    # server_tokens off;
}

stream {
    log_format proxy \'$remote_addr [$time_local] \'
                     \'$protocol $status $bytes_sent $bytes_received \'
                     \'$session_time \"$upstream_addr\" \'
                     \'\"$upstream_bytes_sent\" \"$upstream_bytes_received\" \"$upstream_connect_time\"\';
    access_log /usr/local/openresty/nginx/logs/access.log proxy;
    error_log /usr/local/openresty/nginx/logs/error.log notice;
    open_log_file_cache off;

    include /etc/nginx/conf.d/*.stream;
}

  2. tunnel-proxy.stream 为配置隧道代理的文件，通过查询 Redis 获取代理 IP，并将请求通过代理 IP 转发到指定目标地址，具体内容如下：

    # tunnel-proxy.stream

upstream backend {
    server 0.0.0.0:9870;

    balancer_by_lua_block {
        local balancer = require \"ngx.balancer\"
        local host = ngx.ctx.proxy_host
        local port = ngx.ctx.proxy_port

        local success, msg = balancer.set_current_peer(host, port)
        if not success then
            ngx.log(ngx.ERR, \"Failed to set the peer. Error: \", msg, \".\")
        end
    }
}

server {
    # 对外代理监听端口
    listen 9870;
    listen [::]:9870;

    proxy_connect_timeout 10s;
    proxy_timeout 10s;
    proxy_pass backend;

    preread_by_lua_block {
        local redis = require(\"resty.redis\")
        local redis_instance = redis:new()
        redis_instance:set_timeout(3000)

        # Redis 地址
        local rhost = \"192.168.0.121\"
        # Redis 端口
        local rport = 6379
        # Redis 数据库
        local database = 0
        # Redis Hash 键名
        local rkey = \"use_proxy\"
        local success, msg = redis_instance:connect(rhost, rport)
        if not success then
            ngx.log(ngx.ERR, \"Failed to connect to redis. Error: \", msg, \".\")
        end

        redis_instance:select(database)
        local proxys, msg = redis_instance:hkeys(rkey)
        if not proxys then
            ngx.log(ngx.ERR, \"Proxys num error. Error: \", msg, \".\")
            return redis_instance:close()
        end

        math.randomseed(tostring(ngx.now()):reverse():sub(1, 6))
        local proxy = proxys[math.random(#proxys)]
        local colon_index = string.find(proxy, \":\")
        local proxy_ip = string.sub(proxy, 1, colon_index - 1)
        local proxy_port = string.sub(proxy, colon_index + 1)
        ngx.log(ngx.NOTICE, \"Proxy: \", proxy, \", ip: \", proxy_ip, \", port: \", proxy_port, \".\");
        ngx.ctx.proxy_host = proxy_ip
        ngx.ctx.proxy_port = proxy_port
        redis_instance:close()
    }
}

2.2.3 openresty

通过 docker 启动 openresty，此处笔者为了方便，将 docker 命令保存成了 shell 文件，具体内容如下：

docker run --name openresty -itd --restart always \\
-p 9870:9870 \\
-v $PWD/nginx.conf:/usr/local/openresty/nginx/conf/nginx.conf \\
-v $PWD/conf.d:/etc/nginx/conf.d \\
-e LANG=C.UTF-8 \\
-e TZ=Asia/Shanghai \\
--log-driver json-file \\
--log-opt max-size=1g \\
--log-opt max-file=3 \\
openresty/openresty:alpine

执行 bash docker.sh 命名启动 openresty，至此隧道代理搭建完成。

2.3 测试

import json

import requests
from retrying import retry

proxies = {
    \"http\": \"http://192.168.0.121:9870\"
}


@retry(stop_max_attempt_number=5)
def proxy_test() -> None:
    resp = requests.get(
        url=\"http://httpbin.org/get\", proxies=proxies,  timeout=5, )
    assert resp.status_code == 200
    print(f\"origin: {json.loads(resp.text)[\'origin\']}\")


if __name__ == \"__main__\":
    try:
        proxy_test()
    except Exception as e:
        print(f\"Error: {e}.\")

参考链接：

  • 只要5分钟，创建一个隧道代理 - 知乎 (zhihu.com)
  • openresty正向代理搭建 - 简书 (jianshu.com)

来源：https://www.cnblogs.com/xiaoQQya/p/16305232.html
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