尝试使用thrift的TFileTransport和TFileProcess让Python客户机与Java服务器对话

Question

我试图用thrift的TFileTransport包装一个Java类，以便从Python调用。我尝试使用TJSON和TBinary两种协议，但始终出现此异常

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)

这是我的Python客户端的外观：

^{pr2}$

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();
            }

我从这个帖子中得到了一个例子： Example on how to use TFileTransport in Thrift (Client/Server)

从这篇文章中： 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++的文件传输实际上是一个framed transport，它在数据前面写了一个附加的4字节头。这里的名字似乎有点误导人。在

相反，使用的pythontfileobjecttransport只是一个简单的包装器。这意味着传输不兼容，因此会出现错误消息。在

因此，TSimpleFileTransport应该与Java一起使用，而不是TFileTransport。在