Flume自定义Interceptor

有的时候我们想要对Source的数据做自定义的一些修改操作。

我们主要是通过实现Interceptor 接口来达到我们的目的。

第一步:
我们先使用IDEA创建一个空的maven项目,然后添加一个flume依赖即可。

    <dependencies>
        <dependency>
            <groupId>org.apache.flume</groupId>
            <artifactId>flume-ng-core</artifactId>
            <version>1.9.0</version>
        </dependency>
    </dependencies>

第二步:
直接新建一个实现类LogFormat
代码如下:

import org.apache.commons.codec.binary.Base64;
import org.apache.flume.Context;
import org.apache.flume.Event;
import org.apache.flume.interceptor.Interceptor;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Description: TODO
 *
 * @Author: 留歌36
 * @Date: 2019-11-20 15:02
 */
public class LogFormat implements Interceptor {
    private String date = null;
    private String year = "";
    private String month = "";
    private String day = "";
    private String hour = "";


    final Base64 base64 = new Base64();

    public void initialize() {

    }

    /** 获取信息头和信息体
     *
     *  主要是把原始日志中的 日期时间字段 和 其中的部分数据进行解密好
     *
     * */
    public Event intercept(Event event) {
        Map<String, String>  head = event.getHeaders();
        String body = new String(event.getBody());

//        正则提取
        Pattern p = Pattern.compile("\\[([^]]+)\\]");

        Matcher matcher = p.matcher(body);
        while (matcher.find()){
            String _matcher = matcher.group(1);
            date = _matcher;
        }
        if (date != null){
            SimpleDateFormat sdf = new SimpleDateFormat("dd/MMM/yyyy:HH:mm:ss Z", Locale.ENGLISH);

            SimpleDateFormat sd = new SimpleDateFormat("dd");

            SimpleDateFormat sm = new SimpleDateFormat("MMM");

            SimpleDateFormat sy = new SimpleDateFormat("yyyy");

            SimpleDateFormat sh = new SimpleDateFormat("HH");

            try {
                Date _date = sdf.parse(date);

                year = sy.format(_date);
                month = sm.format(_date);
                date = sd.format(_date);
                hour = sh.format(_date);

            } catch (ParseException e) {
                e.printStackTrace();
            }

            String[] _body = body.split(" ");
            String[] _splits = _body[6].split("\\?");

            String mes = "";
            if (_splits.length == 2){
                mes = new String(base64.decode(_splits[1]));
            }

            event.setBody(mes.getBytes());

            head.put("yearStr",year);
            head.put("monthStr",month);
            head.put("dayStr",day);
            head.put("hourStr",hour);
            return event;
        }


        return null;
    }

    /** 每一条数据都要循环上面的方法 */
    public List<Event> intercept(List<Event> list) {
        for (Event event:list){
            intercept(event);
        }
        return list;
    }

    public void close() {

    }




    /**
     * 把这个类打包成一个单独的Jar,上传到Flume目录下的Lib文件夹中即可
     *
     *
     * */
    public static class Builder implements Interceptor.Builder{

        /** 返回我们上面这个类 */
        public Interceptor build() {
            return new LogFormat();
        }

        public void configure(Context context) {

        }
    }
}

第三步:
打包直接上传到$FLUME_HOME/lib目录下

第四步:
编写自己的conf

a1.sources = r1
a1.sinks = k1
a1.channels = c1

# 拦截器
a1.sources.r1.interceptors = i1
a1.sources.r1.interceptors.i1.type = LogFormat$Builder


a1.sources.r1.type = exec
a1.sources.r1.command = tail -F /opt/nginxlog/access.log
a1.sources.r1.shell = /bin/sh -c

# a1.sinks.k1.type = logger
a1.sinks.k1.type = hdfs
a1.sinks.k1.hdfs.path = hdfs://192.168.1.200:8020/user/hive/warehouse/%{yearStr}/%{monthStr}/%{dayStr}
a1.sinks.k1.hdfs.useLocalTimeStamp = true
a1.sinks.k1.hdfs.writeFormat = Text
a1.sinks.k1.hdfs.fileType = DataStream
a1.sinks.k1.hdfs.filePrefix = %{hourStr}
a1.sinks.k1.hdfs.rollInterval = 10
a1.sinks.k1.hdfs.rollSize = 0
a1.sinks.k1.hdfs.rollCount = 0



a1.channels.c1.type = memory

a1.sources.r1.channels = c1
a1.sinks.k1.channel = c1

启动:

 flume-ng agent --name a1  --conf $FLUME_HOME/conf  --conf-file $FLUME_HOME/conf/test2.conf -Dflume.root.logger=INFO,console

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转载自blog.csdn.net/liuge36/article/details/103167980

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