记一次企业级爬虫系统升级改造(六):基于Redis实现免费的IP代理池

 前言:

  首先表示抱歉,春节后一直较忙,未及时更新该系列文章。

  近期,由于监控的站源越来越多,就偶有站源做了反爬机制,造成我们的SupportYun系统小爬虫服务时常被封IP,不能进行数据采集。

  这时候,前面有园友提到的IP代理就该上场表演了。

 

IP代理池设计:

  博主查阅与调研了多方资料,最终决定先通过爬取网络上各大IP代理网站免费代理的方式,来建立自己的IP代理池。

  最终爬取了五家较为优质的IP代理站点:

    1.西刺代理

    2.快代理

    3.逼格代理

    4.proxy360

    5.66免费代理

  IP代理池方案设计如下:

 

  简单点说就是把在采集的站源里面已知具有反爬机制的站源打上标签,修改所有的爬虫服务,遇到有此标签的站源先从IP代理池随机获取可用的代理IP再进行数据爬取。

  

安装Redis:

  首先,我们需要一台服务器来部署我们的Redis服务(先不考虑集群什么的)。

  博主一向不喜欢弹个小黑框,不停敲命令行进行操作的各种方式。个人认为,GUI是推动计算机快速发展的重要因素之一(非喜勿喷)。

  翻阅了资料,找到了简易的redis安装客户端(windows版本,安装简单到爆),地址如下:

  http://download.csdn.net/detail/cb511612371/9784687

  在博客园找到一篇介绍redis配置文件的博文,贴出来供大家参考:http://www.cnblogs.com/kreo/p/4423362.html

  话说博主就简单的修改了一下内存限制,设置了允许外网连接,设置了一个密码,也没多改其他东西。

  注意,配置文件在安装完成后的目录下,名称是:Redis.window-server.conf

  熟悉一点都知道,redis的c#驱动ServiceStack.Redis,NuGet就可以直接安装。比较坑的是4.0版本后商业化了,限制每小时6000次,要么下载3.9版本,要么考虑其他的驱动,例如:StackExchange。

  博主使用的是ServiceStack V3.9版本,附上下载地址:http://download.csdn.net/detail/cb511612371/9784626

  下面附上博主基于ServiceStack写的RedisManageService,由于业务简单,只使用到了几个API,大家凑合着看。

 1     /// <summary>
 2     /// 基于ServiceStack的redis操作管理服务
 3     /// 当前用到set存储
 4     /// </summary>
 5     public class RedisManageService
 6     {
 7         private static readonly string redisAddress = ConfigurationManager.AppSettings["RedisAddress"];
 8         private static readonly string redisPassword = "myRedisPassword";
 9 
10 
11         /// <summary>
12         /// 获取某set集合 随机一条数据
13         /// </summary>
14         /// <param name="setName"></param>
15         /// <returns></returns>
16         public static string GetRandomItemFromSet(RedisSetNameEnum setName)
17         {
18             using (RedisClient client = new RedisClient(redisAddress, 6379, redisPassword))
19             {
20                 var result = client.GetRandomItemFromSet(setName.ToString());
21                 if (result == null)
22                 {
23                     throw new Exception("redis set集合"+setName.ToString()+"已无数据!");
24                 }
25                 return result;
26             }
27         }
28 
29         /// <summary>
30         /// 从某set集合 删除指定数据
31         /// </summary>
32         /// <param name="setName"></param>
33         /// <param name="value"></param>
34         /// <returns></returns>
35         public static void RemoveItemFromSet(RedisSetNameEnum setName, string value)
36         {
37             using (RedisClient client = new RedisClient(redisAddress, 6379, redisPassword))
38             {
39                 client.RemoveItemFromSet(setName.ToString(), value);
40             }
41         }
42 
43         /// <summary>
44         /// 添加一条数据到某set集合
45         /// </summary>
46         /// <param name="setName"></param>
47         /// <param name="value"></param>
48         public static void AddItemToSet(RedisSetNameEnum setName, string value)
49         {
50             using (RedisClient client = new RedisClient(redisAddress, 6379, redisPassword))
51             {
52                 client.AddItemToSet(setName.ToString(), value);
53             }
54         }
55 
56         /// <summary>
57         /// 添加一个列表到某set集合
58         /// </summary>
59         /// <param name="setName"></param>
60         /// <param name="values"></param>
61         public static void AddItemListToSet(RedisSetNameEnum setName, List<string> values)
62         {
63             using (RedisClient client = new RedisClient(redisAddress, 6379, redisPassword))
64             {
65                 client.AddRangeToSet(setName.ToString(), values);
66             }
67         }
68 
69         /// <summary>
70         /// 判断某值是否已存在某set集合中
71         /// </summary>
72         /// <param name="setName"></param>
73         /// <param name="value"></param>
74         /// <returns></returns>
75         public static bool JudgeItemInSet(RedisSetNameEnum setName, string value)
76         {
77             using (RedisClient client = new RedisClient(redisAddress, 6379, redisPassword))
78             {
79                 return client.Sets[setName.ToString()].Any(t => t == value);
80             }
81         }
82 
83         /// <summary>
84         /// 获取某set数据总数
85         /// </summary>
86         /// <param name="setName"></param>
87         /// <returns></returns>
88         public static long GetSetCount(RedisSetNameEnum setName)
89         {
90             using (RedisClient client = new RedisClient(redisAddress, 6379, redisPassword))
91             {
92                 return client.GetSetCount(setName.ToString());
93             }
94         }
95     }

 

免费代理IP抓取服务实现:

  我们首先设计一个最简单的IpProxy对象:

 1     /// <summary>
 2     /// Ip代理对象
 3     /// </summary>
 4     public class IpProxy
 5     {
 6         /// <summary>
 7         /// IP地址
 8         /// </summary>
 9         public string Address { get; set; }
10 
11         /// <summary>
12         /// 端口
13         /// </summary>
14         public int Port { get; set; }
15     }

  然后实现一个基于Redis的Ip代理池操作服务:

 1     /// <summary>
 2     /// 基于Redis的代理池管理服务
 3     /// </summary>
 4     public class PoolManageService
 5     {
 6         /// <summary>
 7         /// 从代理池随机获取一条代理
 8         /// </summary>
 9         /// <returns></returns>
10         public static string GetProxy()
11         {
12             string result = string.Empty;
13 
14             try
15             {
16                 result = RedisManageService.GetRandomItemFromSet(RedisSetNameEnum.ProxyPool);
17                 if (result != null)
18                 {
19                     if (
20                         !HttpHelper.IsAvailable(result.Split(new[] { ':' })[0],
21                             int.Parse(result.Split(new[] { ':' })[1])))
22                     {
23                         DeleteProxy(result);
24                         return GetProxy();
25                     }
26                 }
27             }
28             catch (Exception e)
29             {
30                 LogUtils.ErrorLog(new Exception("从代理池获取代理数据出错", e));
31             }
32             return result;
33         }
34 
35         /// <summary>
36         /// 从代理池删除一条代理
37         /// </summary>
38         /// <param name="value"></param>
39         public static void DeleteProxy(string value)
40         {
41             try
42             {
43                 RedisManageService.RemoveItemFromSet(RedisSetNameEnum.ProxyPool, value);
44             }
45             catch (Exception e)
46             {
47                 LogUtils.ErrorLog(new Exception("从代理池删除代理数据出错", e));
48             }
49         }
50 
51         /// <summary>
52         /// 添加一条代理到代理池
53         /// </summary>
54         /// <param name="proxy"></param>
55         public static void Add(IpProxy proxy)
56         {
57             try
58             {
59                 if (HttpHelper.IsAvailable(proxy.Address, proxy.Port))
60                 {
61                     RedisManageService.AddItemToSet(RedisSetNameEnum.ProxyPool, proxy.Address + ":" + proxy.Port.ToString());
62                 }
63             }
64             catch (Exception e)
65             {
66                 LogUtils.ErrorLog(new Exception("添加一条代理数据到代理池出错", e));
67             }
68         }
69     }

  提供简易的三个方法:添加代理IP、删除代理IP、随机获取一条代理IP

  我们还需要一个爬虫服务,来爬取我们需要的免费代理IP数据:

  1     /// <summary>
  2     /// IP池 抓取蜘蛛
  3     /// TODO:代理池站点变化较快,时常关注日志监控
  4     /// </summary>
  5     public class IpPoolSpider
  6     {
  7         public void Initial()
  8         {
  9             ThreadPool.QueueUserWorkItem(Downloadproxy360);
 10             ThreadPool.QueueUserWorkItem(DownloadproxyBiGe);
 11             ThreadPool.QueueUserWorkItem(Downloadproxy66);
 12             ThreadPool.QueueUserWorkItem(Downloadxicidaili);
 13         }
 14 
 15         // 下载西刺代理的html页面
 16         public void Downloadxicidaili(object DATA)
 17         {
 18             try
 19             {
 20                 List<string> list = new List<string>()
 21                 {
 22                     "http://www.xicidaili.com/nt/",
 23                     "http://www.xicidaili.com/nn/",
 24                     "http://www.xicidaili.com/wn/",
 25                     "http://www.xicidaili.com/wt/"
 26 
 27                 };
 28                 foreach (var utlitem in list)
 29                 {
 30                     for (int i = 1; i < 5; i++)
 31                     {
 32                         string url = utlitem + i.ToString();
 33                         var ipProxy = PoolManageService.GetProxy();
 34                         if (string.IsNullOrEmpty(ipProxy))
 35                         {
 36                             LogUtils.ErrorLog(new Exception("Ip代理池暂无可用代理IP"));
 37                             return;
 38                         }
 39                         var ip = ipProxy;
 40                         WebProxy webproxy;
 41                         if (ipProxy.Contains(":"))
 42                         {
 43                             ip = ipProxy.Split(new[] { ':' })[0];
 44                             var port = int.Parse(ipProxy.Split(new[] { ':' })[1]);
 45                             webproxy = new WebProxy(ip, port);
 46                         }
 47                         else
 48                         {
 49                             webproxy = new WebProxy(ip);
 50                         }
 51                         string html = HttpHelper.DownloadHtml(url, webproxy);
 52                         if (string.IsNullOrEmpty(html))
 53                         {
 54                             LogUtils.ErrorLog(new Exception("代理地址:" + url + " 访问失败"));
 55                             continue;
 56                         }
 57 
 58                         HtmlDocument doc = new HtmlDocument();
 59                         doc.LoadHtml(html);
 60                         HtmlNode node = doc.DocumentNode;
 61                         string xpathstring = "//tr[@class='odd']";
 62                         HtmlNodeCollection collection = node.SelectNodes(xpathstring);
 63                         foreach (var item in collection)
 64                         {
 65                             var proxy = new IpProxy();
 66                             string xpath = "td[2]";
 67                             proxy.Address = item.SelectSingleNode(xpath).InnerHtml;
 68                             xpath = "td[3]";
 69                             proxy.Port = int.Parse(item.SelectSingleNode(xpath).InnerHtml);
 70                             Task.Run(() =>
 71                             {
 72                                 PoolManageService.Add(proxy);
 73                             });
 74                         }
 75                     }
 76                 }
 77             }
 78             catch (Exception e)
 79             {
 80                 LogUtils.ErrorLog(new Exception("下载西刺代理IP池出现故障", e));
 81             }
 82         }
 83 
 84         // 下载快代理
 85         public void Downkuaidaili(object DATA)
 86         {
 87             try
 88             {
 89                 string url = "http://www.kuaidaili.com/proxylist/";
 90                 for (int i = 1; i < 4; i++)
 91                 {
 92                     string html = HttpHelper.DownloadHtml(url + i.ToString() + "/", null);
 93                     string xpath = "//tbody/tr";
 94                     HtmlDocument doc = new HtmlDocument();
 95                     doc.LoadHtml(html);
 96                     HtmlNode node = doc.DocumentNode;
 97                     HtmlNodeCollection collection = node.SelectNodes(xpath);
 98                     foreach (var item in collection)
 99                     {
100                         var proxy = new IpProxy();
101                         proxy.Address = item.FirstChild.InnerHtml;
102                         xpath = "td[2]";
103                         proxy.Port = int.Parse(item.SelectSingleNode(xpath).InnerHtml);
104                         Task.Run(() =>
105                         {
106                             PoolManageService.Add(proxy);
107                         });
108                     }
109                 }
110             }
111             catch (Exception e)
112             {
113                 LogUtils.ErrorLog(new Exception("下载快代理IP池出现故障", e));
114             }
115         }
116 
117         // 下载proxy360
118         public void Downloadproxy360(object DATA)
119         {
120             try
121             {
122                 string url = "http://www.proxy360.cn/default.aspx";
123                 string html = HttpHelper.DownloadHtml(url, null);
124                 if (string.IsNullOrEmpty(html))
125                 {
126                     LogUtils.ErrorLog(new Exception("代理地址:" + url + " 访问失败"));
127                     return;
128                 }
129                 HtmlDocument doc = new HtmlDocument();
130                 doc.LoadHtml(html);
131                 string xpathstring = "//div[@class='proxylistitem']";
132                 HtmlNode node = doc.DocumentNode;
133                 HtmlNodeCollection collection = node.SelectNodes(xpathstring);
134 
135                 foreach (var item in collection)
136                 {
137                     var proxy = new IpProxy();
138                     var childnode = item.ChildNodes[1];
139                     xpathstring = "span[1]";
140                     proxy.Address = childnode.SelectSingleNode(xpathstring).InnerHtml.Trim();
141                     xpathstring = "span[2]";
142                     proxy.Port = int.Parse(childnode.SelectSingleNode(xpathstring).InnerHtml);
143                     Task.Run(() =>
144                     {
145                         PoolManageService.Add(proxy);
146                     });
147                 }
148             }
149             catch (Exception e)
150             {
151                 LogUtils.ErrorLog(new Exception("下载proxy360IP池出现故障", e));
152             }
153         }
154 
155         // 下载逼格代理
156         public void DownloadproxyBiGe(object DATA)
157         {
158             try
159             {
160                 List<string> list = new List<string>()
161                 {
162                     "http://www.bigdaili.com/dailiip/1/{0}.html",
163                     "http://www.bigdaili.com/dailiip/2/{0}.html",
164                     "http://www.bigdaili.com/dailiip/3/{0}.html",
165                     "http://www.bigdaili.com/dailiip/4/{0}.html"
166                 };
167                 foreach (var utlitem in list)
168                 {
169                     for (int i = 1; i < 5; i++)
170                     {
171                         string url = String.Format(utlitem, i);
172                         string html = HttpHelper.DownloadHtml(url, null);
173                         if (string.IsNullOrEmpty(html))
174                         {
175                             LogUtils.ErrorLog(new Exception("代理地址:" + url + " 访问失败"));
176                             continue;
177                         }
178 
179                         HtmlDocument doc = new HtmlDocument();
180                         doc.LoadHtml(html);
181                         HtmlNode node = doc.DocumentNode;
182                         string xpathstring = "//tbody/tr";
183                         HtmlNodeCollection collection = node.SelectNodes(xpathstring);
184                         foreach (var item in collection)
185                         {
186                             var proxy = new IpProxy();
187                             var xpath = "td[1]";
188                             proxy.Address = item.SelectSingleNode(xpath).InnerHtml;
189                             xpath = "td[2]";
190                             proxy.Port = int.Parse(item.SelectSingleNode(xpath).InnerHtml);
191                             Task.Run(() =>
192                             {
193                                 PoolManageService.Add(proxy);
194                             });
195                         }
196                     }
197                 }
198             }
199             catch (Exception e)
200             {
201                 LogUtils.ErrorLog(new Exception("下载逼格代理IP池出现故障", e));
202             }
203         }
204 
205         // 下载66免费代理
206         public void Downloadproxy66(object DATA)
207         {
208             try
209             {
210                 List<string> list = new List<string>()
211                 {
212                     "http://www.66ip.cn/areaindex_35/index.html",
213                     "http://www.66ip.cn/areaindex_35/2.html",
214                     "http://www.66ip.cn/areaindex_35/3.html"
215                 };
216                 foreach (var utlitem in list)
217                 {
218                     string url = utlitem;
219                     string html = HttpHelper.DownloadHtml(url, null);
220                     if (string.IsNullOrEmpty(html))
221                     {
222                         LogUtils.ErrorLog(new Exception("代理地址:" + url + " 访问失败"));
223                         break;
224                     }
225 
226                     HtmlDocument doc = new HtmlDocument();
227                     doc.LoadHtml(html);
228                     HtmlNode node = doc.DocumentNode;
229                     string xpathstring = "//table[@bordercolor='#6699ff']/tr";
230                     HtmlNodeCollection collection = node.SelectNodes(xpathstring);
231                     foreach (var item in collection)
232                     {
233                         var proxy = new IpProxy();
234                         var xpath = "td[1]";
235                         proxy.Address = item.SelectSingleNode(xpath).InnerHtml;
236                         if (proxy.Address.Contains("ip"))
237                         {
238                             continue;
239                         }
240                         xpath = "td[2]";
241                         proxy.Port = int.Parse(item.SelectSingleNode(xpath).InnerHtml);
242                         Task.Run(() =>
243                         {
244                             PoolManageService.Add(proxy);
245                         });
246                     }
247                 }
248             }
249             catch (Exception e)
250             {
251                 LogUtils.ErrorLog(new Exception("下载66免费代理IP池出现故障", e));
252             }
253         }
254     }

  这段代码也没什么营养,就不仔细解释了。

  前面有说到,博主的爬虫服务都是以windows服务的方式部署的。以前一直用Timer来实现固定间隔多次循环,这次博主引用了Quartz.NET任务调度框架来做,代码看起来更优美一点。

  Quartz.NET可直接在NuGet下载安装。

  先写一个代理池的总调度任务类ProxyPoolTotalJob,继承IJob接口:

 1     /// <summary>
 2     /// 代理池总调度任务
 3     /// </summary>
 4     class ProxyPoolTotalJob : IJob
 5     {
 6         public void Execute(IJobExecutionContext context)
 7         {
 8             var spider = new IpPoolSpider();
 9             spider.Initial();
10         }
11     }

  接下来是在OnStart中运行的Run()方法实现:

 1     private static void Run()
 2         {
 3             try
 4             {
 5                 StdSchedulerFactory factory = new StdSchedulerFactory();
 6                 IScheduler scheduler = factory.GetScheduler();
 7                 scheduler.Start();
 8                 IJobDetail job = JobBuilder.Create<ProxyPoolTotalJob>().WithIdentity("job1", "group1").Build();
 9                 ITrigger trigger = TriggerBuilder.Create()
10                  .WithIdentity("trigger1", "group1")
11                  .StartNow()
12                  .WithSimpleSchedule(
13                  x => x
14                 .WithIntervalInMinutes(28) // 28分钟一次
15                  .RepeatForever()
16                 ).Build();
17                 scheduler.ScheduleJob(job, trigger);
18 
19             }
20             catch (SchedulerException se)
21             {
22                 Console.WriteLine(se);
23             }
24         }

 

  最后采集具有反爬机制的html页面的时候,使用代理IP,这个相信大家都会,设置一下webRequest的Proxy参数即可。

  webRequest.Proxy = new WebProxy(ip, port);

 

  以上,就实现了一个基于redis的免费代理IP池。我们被封IP的爬虫服务又满血复活了,继续采集新数据去。 

 

原创文章,代码都是从自己项目里贴出来的。转载请注明出处哦,亲~~~

posted @ 2017-03-20 10:32 彩色铅笔 阅读(...) 评论(...) 编辑 收藏