Question

我正在尝试使用thrift的TFileTransport包装要从Python调用的Java类。我尝试使用两个协议TJSON和TBinary，但我一直得到这个异常

org.apache.thrift.transport.TTransportException: FileTransport error: bad event size
    at org.apache.thrift.transport.TFileTransport.readEvent(TFileTransport.java:327)
    at org.apache.thrift.transport.TFileTransport.read(TFileTransport.java:468)
    at org.apache.thrift.transport.TFileTransport.readAll(TFileTransport.java:439)
    at org.apache.thrift.protocol.TJSONProtocol$LookaheadReader.read(TJSONProtocol.java:263)
    at org.apache.thrift.protocol.TJSONProtocol.readJSONSyntaxChar(TJSONProtocol.java:320)
    at org.apache.thrift.protocol.TJSONProtocol.readJSONArrayStart(TJSONProtocol.java:784)
    at org.apache.thrift.protocol.TJSONProtocol.readMessageBegin(TJSONProtocol.java:795)
    at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:27)
    at org.apache.thrift.transport.TFileProcessor.processUntil(TFileProcessor.java:69)
    at org.apache.thrift.transport.TFileProcessor.processChunk(TFileProcessor.java:102)
    at org.apache.thrift.transport.TFileProcessor.processChunk(TFileProcessor.java:111)
    at org.apache.thrift.transport.TFileProcessor.processChunk(TFileProcessor.java:118)
    at com.netflix.suro.client.SendToPyServer.startThriftServer(SendToPyServer.java:51)
    at com.netflix.suro.client.SendToPyServer.main(SendToPyServer.java:67)

这就是我的Python客户端的外观：

 def __init__(self):
        self.outFile=open("../../ThriftFile.in","a")
        self.transport = TTransport.TFileObjectTransport(self.outFile)
        self.protocol = TJSONProtocol.TJSONProtocol(self.transport)
        self.client = sendPyInterface.Client(self.protocol)
        self.transport.open()

    def send(self,routingKey, message):
        self.transport.write(pickle.dumps(self.client.send_send(routingKey, message))) 


    def configClient(self,configurationDict):       
        self.transport.write(pickle.dumps(self.client.send_ClientConfig(configurationDict)))    

if __name__ == "__main__":
    SuroClient=SuroPyClient()
    configurationDict={"ClientConfig.LB_TYPE":"static","ClientConfig.LB_SERVER":"localhost:7101"}
    SuroClient.configClient(configurationDict)
    SuroClient.send("routingKey", "testMessage")

这是我的服务器：

public static void startThriftServer(SendPyInterface.Processor processor) {
            try {
                File input = new File("src/main/java/com/netflix/suro/client/ThriftFile.in");
                if(!input.exists()){
                    input.createNewFile();
                }

                File output = new File("src/main/java/com/netflix/suro/client/ThriftFile.out");
                if(!output.exists()){
                    output.createNewFile();
                }

                TFileTransport inputFileTransport = new TFileTransport(input.getAbsolutePath(), true);
                TFileTransport outputFileTransport = new TFileTransport(output.getAbsolutePath(), false);
                System.out.println(input.getAbsolutePath());
                System.out.println(input.length());

                inputFileTransport.open();
                outputFileTransport.open();
                System.out.println(inputFileTransport.getBytesRemainingInBuffer());
                inputFileTransport.setTailPolicy(tailPolicy.WAIT_FOREVER);
                System.out.println("Wait ...");
                System.out.println(inputFileTransport.getBuffer());
                TFileProcessor fProcessor = 
                        new TFileProcessor(processor, new TJSONProtocol.Factory(), inputFileTransport, outputFileTransport);
                try {
                    fProcessor.processChunk();
                } catch (TTransportException e) {
                    e.printStackTrace();
                }


                System.out.println("File Thrift service started ...");
            } catch (Exception e) {
                e.printStackTrace();
            }

我已经跟随了这个帖子的例子： Example on how to use TFileTransport in Thrift (Client/Server)

并从这篇文章： http://theprogrammersguideto.com/thrift/blog/code/chapter-3-moving-bytes-with-transports/

Answer 1

根据docs in the old Thrift wiki，Java和C ++ TFileTransport实际上是framed transport，它在数据之前写入另外的4字节头。似乎这里的名字有点误导。

相比之下，使用的Python TFileObjectTransport只是一个简单的包装器。这意味着传输不兼容，因此错误消息。

因此，TFileTransport应与Java一起使用而不是TSimpleFileTransport。

尝试使用thrift的TFileTransport和TFileProcessor让Python客户端与Java服务器通信

1 个答案: