Flume简介与使用（二）——Thrift Source采集数据

Flume简介与使用（二）——Thrift Source采集数据

　　继上一篇安装Flume后，本篇将介绍如何使用Thrift Source采集数据。

　　Thrift是Google开发的用于跨语言RPC通信，它拥有功能强大的软件堆栈和代码生成引擎，允许定义一个简单的IDL文件来生成不同语言的代码，服务器端和客户端通过共享这个IDL文件来构建来完成通信。

　　Flume的Thrift Source是其实现的众多Source中的一个，Flume已经实现了服务器端，因此我们可以用任意自己熟悉的语言编写自己的Thrift Source客户端来采集数据，然后发送给Thrift Source服务器端。

　　[一]、生成C++代码

　　下载源码版的Flume，在apache-flume-1.6.0-srcflume-ng-sdksrcmain hrift目录下有Flume定义好的flume.thrift文件，现在只要用这个文件来生成我们需要的代码就行了。

　　flume.thrift文件内容如下：

namespace java org.apache.flume.thrift

struct ThriftFlumeEvent {
  1: required map <string, string> headers,
  2: required binary body,
}

enum Status {
  OK,
  FAILED,
  ERROR,
  UNKNOWN
}

service ThriftSourceProtocol {
  Status append(1: ThriftFlumeEvent event),
  Status appendBatch(1: list<ThriftFlumeEvent> events),
}

　　1、定义了一个ThriftFlumeEvent结构体，用来封装发送的数据；

　　2、定义了一个service类ThriftSourceProtocol，服务器端具体实现ThriftSourceProtocol里面的两个方法，再由客户端调用这些方法把数据传给Thrift Source服务器端。

　　3、运行下面的命令：thrift --gen cpp flume.thrift，会在当前目录生成gen-cpp目录，里面是Thrift自动生成c++头文件和代码。（在这之前要先安装Thrift）

　　[二]、下面是编写自己的客户端代码，我这里是接收远程传过来的数据，然后发送给Flume的Thrift Source服务器。

#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <pthread.h>
#include <unistd.h>
#include <stdlib.h>
#include "include/MESA_prof_load.h"
#include "include/MESA_handle_logger.h"

#include <string>
#include <iostream>
#include "gen-cpp/flume_constants.h"
#include "gen-cpp/flume_types.h"
#include "gen-cpp/ThriftSourceProtocol.h"
#include <thrift/protocol/TBinaryProtocol.h>
#include <thrift/protocol/TCompactProtocol.h>
#include <thrift/transport/TSocket.h>
#include <thrift/transport/TTransportUtils.h>
using namespace std;
using namespace apache::thrift;
using namespace apache::thrift::protocol;
using namespace apache::thrift::transport;

#define LOG_PATH "/home/zjf/DFcode/trafficlog/traffic_source.log"
#define DATA_BUFFER 2048    //send buffer data length
#define BUFLEN   2048       //received buffer data length
#define BATCH_SIZE 1000     //send event num to flume once

//defined my C++ object
class ThriftClient{
    public:
        // Thrift protocol needings...
        boost::shared_ptr<TTransport> socket;
        boost::shared_ptr<TTransport> transport;
        boost::shared_ptr<TProtocol> protocol;
        ThriftSourceProtocolClient* pClient;

    public:
        ThriftClient();
};
//cconstruction function, init the thrift source server ip and port
ThriftClient::ThriftClient():
    socket(new TSocket("10.208.129.12",5497)),
    transport(new TFramedTransport(socket)),
    protocol(new TCompactProtocol(transport))
{
    pClient = new ThriftSourceProtocolClient(protocol);
}

//log
struct log_info_t{
    char *path;
    int log_level;
    void * handle;
};
struct log_info_t log_info;
const char *module = "zjf_traffic_data_collector";

//类的对象
ThriftClient *client = new ThriftClient();
std::map<std::string, std::string>  headers;
std::vector<ThriftFlumeEvent> eventbatch;
unsigned long long pkt_num_tgl = 0;

int RecvAndSendUDP(){
    MESA_handle_runtime_log(log_info.handle, RLOG_LV_INFO, module, "RecvUDP be called");
    int listen_socket;　　　　　　　　　　//socket id
    struct sockaddr_in    local;　　　　//client IP, where to recevied data
    struct sockaddr_in    from;    　　//server IP(local host)
    char server_addr[16] = "10.208.129.12";    //received traffic IP
    int server_port = 6789;                    //received traffic port
    char send_buf[DATA_BUFFER] = {0};          //data send to flume
    char Buf[BUFLEN] = {0};
    int fromlen;
    int len;

    //init socket
reconnect:
    memset(&local, 0, sizeof(local));
    local.sin_family = AF_INET;
    local.sin_addr.s_addr = inet_addr(server_addr);
    local.sin_port = htons(server_port);
    listen_socket = socket(AF_INET, SOCK_DGRAM, 0); // UDP socket
    if(listen_socket < 0) {
        printf("error udp socket
");
    }else{
        printf("listen_socket create OK
");
    }
    if(bind(listen_socket, (struct sockaddr *)&local, sizeof(local)) < 0) {
        printf("error udp bind
");
        return -1;
    }else{
        printf("socket bind OK
");
    }

    while(1){
        char sip[16] = {0};
        char dip[16] = {0};
        char srcport[6] = {0};
        char destport[6] = {0};
        char url[BUFLEN] = {0};
        memset(Buf,0,BUFLEN);
        fromlen = sizeof(from);
        len = recvfrom(listen_socket, (void *)Buf, (size_t)BUFLEN, 0, (struct sockaddr *)&from,(socklen_t *)&fromlen);
        if(len == -1) {
            printf("error udp recvfrom
");
            close(listen_socket);
            goto reconnect;
        }
        //parse received buf, transform to key-value
        int i;
        int sip_loc = 0;
        int sport_loc = 0;
        int dip_loc = 0;
        int dport_loc = 0;
        int dotcount = 0;
        for(i=0;Buf[i] != '';i++){
            if(Buf[i] == '.'){
                dotcount++;
                if(dotcount == 4){
                    sip_loc = i;
                    memcpy(sip,Buf,i);
                }
                else if(dotcount == 8){
                    dip_loc = i;
                    memcpy(dip,Buf+sport_loc+1,dip_loc-sport_loc-1);
                }
                else if(dotcount == 9){
                    dport_loc = i;
                    memcpy(destport,Buf+dip_loc+1,dport_loc-dip_loc-1);
                    break;
                }
                else{}
            }
            if(Buf[i] == '>'){
                sport_loc = i;
                memcpy(srcport,Buf+sip_loc+1,sport_loc-sip_loc-1);
            }
        }
        memcpy(url,Buf+dport_loc+1,strlen(Buf)-dport_loc);
        unsigned long src_ip = inet_addr(sip);
        unsigned long dst_ip = inet_addr(dip);
        sprintf(send_buf,"SrcIP=%u SrcPort=%s DestIP=%u DestPort=%s",ntohl(src_ip),srcport,ntohl(dst_ip),destport);
        //construct an event and append to send
        if(0 != strlen(send_buf) ){
            pkt_num_tgl++;
            string sBody(send_buf);
            ThriftFlumeEvent tfEvent;
            tfEvent.__set_headers(headers);
            tfEvent.__set_body(sBody);
            eventbatch.push_back(tfEvent);
            if(eventbatch.size() >= BATCH_SIZE){
                if(!client->transport->isOpen())
                    client->transport->open();
                Status::type res = client->pClient->appendBatch(eventbatch);
                if(res != Status::OK){
                    MESA_handle_runtime_log(log_info.handle, RLOG_LV_FATAL, module, "WARNING: send event via thrift failed, return code:%d",res);
                }else{
                    //printf("sended %lld event data to flume successful
", pkt_num_tgl);
                }
                eventbatch.clear();
            }
        }
        bzero(send_buf,DATA_BUFFER);
    }
}


int main()
{
    //create――logger
    log_info.path = (char *)LOG_PATH;
    log_info.log_level = 10;
    log_info.handle = MESA_create_runtime_log_handle(log_info.path, log_info.log_level);
    //open thrift connection
    if(!client->transport->isOpen()){
        client->transport->open();
    }
    eventbatch.clear();
    RecvAndSendUDP();
    return 0;
}

 [三]、编译并运行

　　g++ -g -DHAVE_NETINET_IN_H -I. -I/usr/local/include/thrift -L/usr/local/lib rec_send_traffic_thrift.cpp gen-cpp/flume_constants.cpp gen-cpp/flume_types.cpp gen-cpp/ThriftSourceProtocol.cpp  -o  rec_send_traffic_thrift  -lthrift   -lpcap -L/usr/lib64 -lMESA_htable -lpthread -lMESA_handle_logger

　　用守护进程启动程序：

#!/bin/sh

while [ 1 ]; do
    ulimit -c unlimited
    #./jz
    #cgexec -g cpu,memory:/MESA/jz ./jz >> jz.log
    ./rec_send_traffic_thrift
    #./jz
    echo program crashed, restart at `date +"%w %Y/%m/%d, %H:%M:%S"` >> RESTART.log
    sleep 10
done

---

推荐博文：【1】http://www.micmiu.com/soa/rpc/thrift-sample/

　　　　　【2】http://www.mamicode.com/info-detail-869223.html

　　　　　【3】http://blog.csdn.net/yuzx2008/article/details/50179033

　　　　　【4】http://shiyanjun.cn/archives/456.html

　　　　　【5】http://flume.apache.org/FlumeDeveloperGuide.html#rpc-clients-avro-and-thrift

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