thrift服务(for Python/Java)的简易搭建步骤(不求甚解版)

96
虎哥_huge
2017.11.05 22:58* 字数 501

关于这个话题,网上有大量的文章;但是配置部分都讲得比较混乱,直接拷来并不能跑通。
本文以python和java分别作为服务端/客户端及其逆形式进行了演示,不求甚解,只求能用。

定义好thrift文件,作为C/S的契约[1]

xxx.thrift
注意:以下代码都是手动混淆过的,仅大致示意写法,不保证内容正确

namespace java com.x1.x2.x3.x4.x5.gen_java # 注意,如果是为java版本准备的,一定要写好package

struct MyStruct1{
    1:string field1,
    2:list<string> field2,
    3:optional list<MyStruct1> field3, # 注意java不支持optinal,生成的代码中只有必选项
}

struct MyStruct2{
    1:list<i16> data
}

service MyService{
    void f1(1:MyStruct1 s1)
    list<MyStruct2> f2(1:string field1, 2:MyStruct1 data)
}

将thrift文件分别编译成服务器端语言和客户端语言
注意:自动生成的python代码中,可能有class A依赖class B,而A的代码却写到了同一个文件中B的下方的情况;这可能是thrift的一个BUG,手动调整代码顺序即可

mkdir gen_py gen_java # 默认名字是用短横线分隔(gen-py),不符合python的包命名要求;手动改成下划线
thrift -r --gen py -out gen_py xxx.thrift
thrift -r --gen java -out ../../../../../../ xxx.thrift # 路径中有x1-x5,就要上6层

实现服务端逻辑

注意:

  • gen_py和gen_java文件夹的内容最好别改动;它们都只是作为辅助类库使用的
  • 服务器端要自己写一个Handler类去override指定的方法
  • 客户端只要绑定到指定的端口上调用即可

python版服务器端

先用自己的类来继承IFace,实现各个接口

# thrift 相关的引用
from thrift.protocol import TBinaryProtocol
from thrift.server import TServer
from thrift.transport import TSocket, TTransport
# import ... # 逻辑相关的引用

class MyHandler(MyService.Iface):
    def __init__(self):
        transport = TSocket.TSocket('hostname', 8095) # 最好用IP,稳一点
        transport = TTransport.TBufferedTransport(transport)
        transport.open()  # 注意这一行不能少
        protocol = TBinaryProtocol.TBinaryProtocol(transport)
        # self.xxx = yyy 之类的初始化,省略 ...

    def f1(self, arg1):
        pass # ...

然后写一个server.py来包裹handler并控制服务的起停

from thrift.protocol import TBinaryProtocol
from thrift.server import TServer
from thrift.transport import TSocket, TTransport

# sys.path.append('thrift/gen_py') # 可能需要把gen_py加到PYTHONPATH
# import ... # 逻辑相关的引用

def main():
    handler = MyHandler()
    processor = MyService.Processor(handler)
    transport = TSocket.TServerSocket('10.1.x.x', 8081)
    tfactory = TTransport.TBufferedTransportFactory()
    pfactory = TBinaryProtocol.TBinaryProtocolFactory()
    server = TServer.TThreadPoolServer(processor, transport, tfactory, pfactory)

    logger.info('---------- starting xxx server over thrift...')
    server.serve()
    logger.info('---------- shutting down xxx server over thrift...')

if __name__ == '__main__':
    main()

java版的服务器端

同理,先写个Handler类来覆盖相应的method

package com.xxx.xxx.xxx
// import ...

public class MyHandler implements MyService.Iface {
    @Override
    public synchronized void f1(MyStruct1 arg1) throws TException {
        // ...
    }
    // ... 
}

然后写个Server类来包裹Handler并控制服务的起停

package com.x.x.x.xxx

import ... // 逻辑相关的引用
import org.apache.thrift.server.TServer;
import org.apache.thrift.server.TSimpleServer;
import org.apache.thrift.server.TThreadPoolServer;
import org.apache.thrift.transport.TServerSocket;
import org.apache.thrift.transport.TTransportException;

import java.io.IOException;
import java.net.InetSocketAddress;

public class MyServer {
    public static void main(String[] args) throws IOException, TTransportException {
        MyService.Processor processor = new MyService.Processor(new MyHandler());

        TServerSocket serverTransport = new TServerSocket(new InetSocketAddress("1.2.3.4", 1234));
        TServer server = new TSimpleServer(new TThreadPoolServer.Args(serverTransport).processor(processor));
        System.out.println("Starting server...");
        server.serve();
    }
}

实现客户端逻辑

java版客户端

先把之前运行thrift -r --gen java ...命令生成的gen_java文件夹拷进来,作为一个package;
然后把Guava等其它各种类库写进maven/Gradle。
插一句:如果用到读写wav文件的功能,可以把wavFile相关的类库[2]下载了拷进来。

package com.xxx.yyy;

import org.apache.thrift.TException;
import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.transport.TSocket;
import org.apache.thrift.transport.TTransport;
// import ...

public class App {
    public void work(List<String> arg) {
        try {
            TTransport transport = new TSocket("1.2.3.4", 1234); // 注意两边都尽量用IP,比较稳一点
            transport.open();
            TProtocol protocol = new TBinaryProtocol(transport);
            
            MyService.Client client = new MyService.Client(protocol);
            // arg1 = ...
            client.f1(arg);
            // 多次调用 client.f2(...)

            transport.close();
            System.out.println("----- client done");
        } catch (TException ex) {
            ex.printStackTrace();
        } // 更多catch ...
    }

    public static void main(String[] args) {
        App app = new App();
        app.work(Lists.newArrayList("arm", "aunt", "autumn"));
    }
}

python版的客户端写法

from thrift.protocol import TBinaryProtocol
from thrift.transport import TSocket, TTransport

# 可能需要将gen_py加到PYTHONPATH
# import 逻辑相关的模块 ...

def main():
    transport = TSocket.TSocket('1.2.3.4', 8081)
    transport = TTransport.TBufferedTransport(transport)
    transport.open()
    protocol = TBinaryProtocol.TBinaryProtocol(transport)
    client = MyService.Client(protocol)

    # arg = ...
    client.f1(arg)
    # 多次调用 client.f2(...)
    print('----- client done')

if __name__ == '__main__':
    main()

  1. thrift文件写法参考:http://www.jianshu.com/p/0f4113d6ec4b

  2. Java Wav File IO API:http://www.labbookpages.co.uk/audio/javaWavFiles.html

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