通过HTTP向kafka发送数据

      在大数据整个处理流程过程中，数据的流向是一个很重要的问题，本篇博客主要记录数据是怎么从http发送到kafka的。

使用技术点：

1. java的Vert.x框架

　　(关于java框架Vert.x的使用示例请移步：http://www.programcreek.com/java-api-examples/index.php?api=io.vertx.core.Vertx)

2. KafkaProducer 的使用

　　(使用示例移步：http://www.programcreek.com/java-api-examples/index.php?api=org.apache.kafka.clients.producer.KafkaProducer)

在导数据的过程中需要实现的功能：

1. 解析路径，将路径的最后一个字符串作为appkey；

2. 数据缓存，当kafka无法正常访问时在本地cache目录缓存数据；

3. 安全验证，对请求的appkey进行合法性验证；

4. 自动更新appkey列表，每间隔一段时间获取一次最新的appkey列表；

5. 增加ip字段，给每份数据增加ip字段；

6. 记录日志，记录基本的统计信息日志，及异常错误信息。

框架结构图如下所示：

数据整体计算图如下所示：

计算流程图如下所示:

在IDEA中的代码结构为：

主要代码如下：

Configuration.java

package com.donews.data;

import com.typesafe.config.Config;
import com.typesafe.config.ConfigFactory;

/**
 * Created by reynold on 16-6-23.
 * 
 */
public class Configuration {
   public static  final Config conf= ConfigFactory.load();
}

Counter.java

package com.donews.data;


import io.vertx.core.Vertx;
import io.vertx.core.logging.Logger;
import io.vertx.core.logging.LoggerFactory;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
/**
 * Created by reynold on 16-6-22.
 * 
 */
public class Counter {
    private Logger LOG = LoggerFactory.getLogger(Counter.class);
    AtomicLong messages = new AtomicLong(0L);
    AtomicLong bytes = new AtomicLong(0L);
    private long start = System.currentTimeMillis();

    private void reset() {
        messages.set(0L);
        bytes.set(0L);
        start = System.currentTimeMillis();
    }

    public void start(Vertx vertx) {
        LOG.info("start Counter");
        long delay = Configuration.conf.getDuration("server.counter.delay", TimeUnit.MILLISECONDS);
        vertx.setPeriodic(delay, h -> {
            long time = System.currentTimeMillis() - start;
            double rps = messages.get() * 1000.0 / time;
            double mbps = (bytes.get() * 1000.0 / 1024.0 / 1024.0) / time;
            Runtime runtime = Runtime.getRuntime();
            double totalMem = runtime.totalMemory() * 1.0 / 1024 / 1024;
            double maxMem = runtime.maxMemory() * 1.0 / 1024 / 1024;
            double freeMem = runtime.freeMemory() * 1.0 / 1024 / 1024;
            LOG.info("{0}:Message/S, {1}:MBytes/S", rps, mbps);
            LOG.info("totalMem:{0}MB maxMem:{1}MB freeMem:{2}MB", totalMem, maxMem, freeMem);
            reset();
        });
    }


}

KafkaHttpServer.java

package com.donews.data;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import io.vertx.core.Vertx;
import io.vertx.core.http.HttpServer;
import io.vertx.core.http.HttpServerResponse;
import io.vertx.core.json.JsonArray;
import io.vertx.core.json.JsonObject;
import io.vertx.core.logging.Logger;
import io.vertx.core.logging.LoggerFactory;
import io.vertx.ext.web.Router;
import io.vertx.ext.web.RoutingContext;
import io.vertx.ext.web.handler.BodyHandler;

import java.io.*;
import java.sql.*;
import java.time.Instant;
import java.util.HashSet;
import java.util.Set;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * Created by reynold on 16-6-22.
 * 
 */

public class KafkaHttpServer {
    private static final Logger LOG = LoggerFactory.getLogger(KafkaHttpServer.class);
    private final Counter statistic = new Counter();
    private static final String DBDRIVER = "com.mysql.jdbc.Driver";
    private static final String URL = Configuration.conf.getString("mysql.url");
    private static final String USER = Configuration.conf.getString("mysql.user");
    private static final String PASSWORD = Configuration.conf.getString("mysql.password");
    private static HashSet<String> appkeys = new HashSet<>();
    private static boolean deleteFile = true;

    private void error(HttpServerResponse response, String message) {
        response.setStatusCode(500).end(new JsonObject()
                .put("code", 3)
                .put("msg", message)
                .encode());
    }

    private void ok(HttpServerResponse response, String message) {
        response.putHeader("Access-Control-Allow-Origin", "*");
        response.setStatusCode(200).end(new JsonObject()
                .put("code", 0)
                .put("msg", message)
                .encode());
    }

    private void startService(int port) {
        KafkaProducerWrapper sender = new KafkaProducerWrapper();
        Vertx vertx = Vertx.vertx();
        HttpServer server = vertx.createHttpServer();
        Router router = Router.router(vertx);
        router.route().handler(BodyHandler.create());
        router.route("/mininfo/logs").handler(ctx -> {
            try {
                JsonArray array = ctx.getBodyAsJsonArray();
                String[] messages = new String[array.size()];
                for (int i = 0; i < array.size(); i++) {
                    JsonObject message = array.getJsonObject(i);
                    message.put("ip", ctx.request().remoteAddress().host());
                    if (!message.containsKey("timestamp")) {
                        message.put("timestamp", Instant.now().toString());
                    }
                    messages[i] = array.getJsonObject(i).encode();
                }
                sendMessages(sender, ctx, "appstatistic_production", messages);
            } catch (Exception e) {
                error(ctx.response(), e.getMessage());
            }

        });
        router.routeWithRegex("/mininfo/v1/logs/[^/]+").handler(routingContext -> {
            String path = routingContext.request().path();
            String topic = path.substring(path.lastIndexOf("/") + 1);
            LOG.info("现在处理的topic(appkey)为：" + topic);
            if (appkeys.contains(topic)) {
                LOG.info("经过验证，该topic(appkey)有效");
                String[] messages = routingContext.getBodyAsString().split("
");
                //用于执行阻塞任务(有序执行和无序执行)，默认顺序执行提交的阻塞任务
                vertx.executeBlocking(future -> {
                    sendMessages(sender, routingContext, topic, messages);
                    future.complete();
                }, result -> {
                });
            } else {
                LOG.info("您的topic(appkey)还没有配置，请在mysql中配置先");
                error(routingContext.response(), "please configurate " + topic + "(appkey) in Mysql first! After 10mins it`ll take action");
            }
        });
        router.route("/mininfo/v1/ip").handler(ctx -> {
            LOG.info("x-real-for" + ctx.request().getHeader("x-real-for"));
            LOG.info("x-forwarded-for" + ctx.request().getHeader("x-forwarded-for"));
            ok(ctx.response(), ctx.request().getHeader("x-forwarded-for"));
        });
        router.route("/*").handler(ctx -> error(ctx.response(), "wrong! check your path..."));
        server.requestHandler(router::accept).listen(port, result -> {
            if (result.succeeded()) {
                LOG.info("listen on port:{0}", String.valueOf(port));
                this.statistic.start(vertx);
            } else {
                LOG.error(result.cause());
                vertx.close();
            }
        });
        //如果你需要在你的程序关闭前采取什么措施，那么关闭钩子（shutdown hook）是很有用的，类似finally
        Runtime.getRuntime().addShutdownHook(new Thread(sender::close));
    }

    private void sendMessages(KafkaProducerWrapper sender, RoutingContext ctx, String topic, String[] messages) {
        AtomicInteger counter = new AtomicInteger(0);
        for (String message : messages) {
            if (message == null || "".equals(message)) {
                ok(ctx.response(), "Success");
                continue;
            }
            //将ip增加到数据的ip字段
            JSONObject jsonObject = JSON.parseObject(message);
            if (jsonObject.get("ip") == null) {
                LOG.info("正在增加ip字段");
                String ip;
                String header = ctx.request().getHeader("x-forwarded-for");
                if (!(header == null || header.trim().length() == 0 || header.trim().equals("null"))) {
                    ip = header.split(",")[0];
                } else {
                    ip = ctx.request().remoteAddress().host();
                }
                jsonObject.put("ip", ip);
                LOG.info("ip增加成功");
            }
            //topic, message, callback，以匿名函数的形式实现接口中的onCompletion函数
            sender.send(topic, jsonObject.toString(), (metadata, exception) -> {
                if (exception != null) {
                    LOG.warn(exception);
                    String msg = new JsonObject()
                            .put("error", exception.getMessage())
                            .put("commit", counter.get())
                            .encode();
                    error(ctx.response(), msg);
                    cacheLocal(jsonObject.toString(), "/home/yuhui/httpkafka/data_bak/" + topic + ".txt");
                    LOG.info("连接kafka失败，写入cache缓存目录以备份数据");
                } else {
                    statistic.messages.incrementAndGet();  // Counter
                    statistic.bytes.addAndGet(message.length());
                    if (counter.incrementAndGet() == messages.length) {
                        ok(ctx.response(), "Success");
                    }
                }
            });
        }
    }

    /**
     * 将发送到kafka失败的消息缓存到本地
     *
     * @param message   message
     * @param cachePath cachePath
     */
    private void cacheLocal(String message, String cachePath) {
        try {
            FileWriter fileWriter = new FileWriter(cachePath, true);
            BufferedWriter bw = new BufferedWriter(fileWriter);
            bw.write(message);
            bw.newLine();
            bw.flush();
            bw.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 发送缓存数据到kafka，发送成功，删除缓存数据，失败过10分钟重试
     *
     * @param path 保存缓存数据的[目录]
     */
    private static void sendToKafka(String path) {
        String message;
        KafkaProducerWrapper sender = new KafkaProducerWrapper();
        File file = new File(path);
        if (file.isDirectory()) {
            String[] fileList = file.list();
            if (fileList != null && fileList.length != 0) {
                LOG.info("正在将缓存目录中的备份数据发送到kafka中...");
                for (String str : fileList) {
                    String topic = str.split("\.")[0];
                    try {
                        BufferedReader reader = new BufferedReader(new FileReader(path + str));
                        while ((message = reader.readLine()) != null) {
                            sender.send(topic, message, (metadata, exception) -> {
                                if (metadata != null) {
                                    LOG.info("缓存的备份数据正在一条一条的插入kafka中");
                                } else {
                                    //程序错误重新运行
//                                    exception.printStackTrace();
                                    LOG.error("kafka连接异常为：===> 10分钟后会自动重试，" + exception.getMessage(), exception);
                                    deleteFile = false;
                                }
                            });
                        }
                        if (deleteFile) {
                            LOG.info("开始删除已经插入到kafka中的缓存备份数据");
                            deleteFile(path, topic);
                            LOG.info("删除完毕！");
                        }
                        reader.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            } else {
                LOG.info("缓存目录中没有备份文件");
            }
        }
    }

    private static void deleteFile(String path, String appkey) {
        String appkeyPath = path + "/" + appkey + ".txt";
        File file = new File(appkeyPath);
        file.delete();
        LOG.info("成功删除appkey为" + appkey + "的缓存数据");
    }

    private static Set<String> getAppkeys() {
        Set<String> appkeys = new HashSet<>();
        String sql = "select appkey from config_table";
        try {
            Class.forName(DBDRIVER);
            Connection conn = DriverManager.getConnection(URL, USER, PASSWORD);
            PreparedStatement ps = conn.prepareStatement(sql);
            ResultSet rs = ps.executeQuery();
            while (rs.next()) {
                appkeys.add(rs.getString(1));
            }
            rs.close();
            conn.close();
        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        }
        return appkeys;
    }

    public static void main(String[] args) throws Exception {
        Timer timer = new Timer();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                appkeys.addAll(getAppkeys());
                LOG.info("同步完数据库中的appkey(每隔十分钟)");
                sendToKafka("/home/leixingzhi7/httpkafka/data_bak/");
//                sendToKafka("C:\Dell\UpdatePackage\log");
            }
        }, 0L, 10 * 60 * 1000L);

        try {
            int port = Configuration.conf.getInt("server.port");
            KafkaHttpServer front = new KafkaHttpServer();
            front.startService(port);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

KafkaProducerWrapper.java

package com.donews.data;

import com.typesafe.config.Config;
import io.vertx.core.logging.Logger;
import io.vertx.core.logging.LoggerFactory;
import org.apache.kafka.clients.producer.Callback;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;


import java.util.Properties;

/**
 * Created by reynold on 16-6-22.
 * 
 */
public class KafkaProducerWrapper {
    private Logger LOG = LoggerFactory.getLogger(KafkaProducerWrapper.class);
    private KafkaProducer<String, String> producer = init();

    private KafkaProducer<String, String> init() {
        Config conf = Configuration.conf.getConfig("kafka");
        Properties props = new Properties();
        props.put("bootstrap.servers", conf.getString("bootstrap.servers"));
        props.put("acks", conf.getString("acks"));
        props.put("retries", conf.getInt("retries"));
        props.put("batch.size", conf.getInt("batch.size"));
        props.put("linger.ms", conf.getInt("linger.ms"));
        props.put("buffer.memory", conf.getLong("buffer.memory"));
        props.put("key.serializer", conf.getString("key.serializer"));
        props.put("value.serializer", conf.getString("value.serializer"));
        LOG.info("KafkaProducer Properties: {0}", props.toString());
        return new KafkaProducer<>(props);
    }

    public void send(String topic, String message, Callback callback) {
        producer.send(new ProducerRecord<>(topic, message), callback);
    }

    public void close() {
        producer.close();
        LOG.info("Kafka Producer Closed");
    }

    public static void main(String[] args) {
        //KafkaProducerWrapper sender=new KafkaProducerWrapper();
        //sender.producer.partitionsFor("xxxxx").forEach(System.out::println);
    }
}

application.conf

server {
  port = 20000
  counter.delay = 30s
}
kafka {
  bootstrap.servers = "XXX"
  acks = all
  retries = 1
  batch.size = 1048576
  linger.ms = 1
  buffer.memory = 33554432
  key.serializer = "org.apache.kafka.common.serialization.StringSerializer"
  value.serializer = "org.apache.kafka.common.serialization.StringSerializer"
}
mysql {
  url = "jdbc:mysql://XXX/user_privileges"
  user = "XXX"
  password = "XXX"
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.donews.data</groupId>
    <artifactId>kafkahttp</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <!-- https://mvnrepository.com/artifact/com.typesafe/config -->
        <dependency>
            <groupId>com.typesafe</groupId>
            <artifactId>config</artifactId>
            <version>1.3.0</version>
        </dependency>

        <dependency>
            <groupId>io.vertx</groupId>
            <artifactId>vertx-web</artifactId>
            <version>3.2.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka-clients</artifactId>
            <version>0.9.0.1</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.11</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.5.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>2.4</version>
                <configuration>
                    <filters>
                        <filter>
                            <artifact>*:*</artifact>
                            <excludes>
                                <exclude>META-INF/*.SF</exclude>
                                <exclude>META-INF/*.DSA</exclude>
                                <exclude>META-INF/*.RSA</exclude>
                            </excludes>
                        </filter>
                    </filters>
                    <!-- put your configurations here -->
                </configuration>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>

                        <configuration>
                            <transformers>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                    <mainClass>com.donews.data.KafkaHttpServer</mainClass>
                                </transformer>
                            </transformers>
                            <outputFile>${project.build.directory}/${project.artifactId}-fat.jar</outputFile>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>


</project>