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深入探索Python中的Thrift.transport.TTransport模块源码

发布时间:2023-12-28 07:37:09

Thrift是一个跨语言的远程过程调用(RPC)协议和软件框架。它支持多种语言,包括Python。在Thrift中,Thrift.transport.TTransport模块是与底层传输层交互的接口。

首先,我们来看一下Thrift.transport.TTransport模块的源码。在源码中,TTransport类是TTransport模块中的基类。它提供了一组基本的读写方法,供子类实现具体的传输协议。下面是TTransport类的代码:

class TTransport(object):
    """
    Base class for Thrift transport. This is the base class for all
    transports used by Thrift. It provides a basic read/write interface
    that all transport implementations must satisfy.

    Transports are stateful, but do not have to be thread safe, as
    they are expected to be used by only one thread at a time.
    """
    def isOpen(self):
        """
        Returns True if the transport is open, else False.
        """
        pass

    def open(self):
        """
        Opens the transport for reading/writing.
        """
        pass

    def close(self):
        """
        Closes the transport.
        """
        pass

    def read(self, sz):
        """
        Reads up to 'sz' bytes from the transport.

        Throws an TTransportException if there is an error reading.
        """
        pass

    def readAll(self, sz):
        """
        Read 'sz' bytes into string buffer 'buf' raising exception if it couldn't
        read requested number of bytes

        Throws an TTransportException if there is an error reading.
        """
        buf = ''
        have = 0
        while (have < sz):
          chunk = self.read(sz-have)
          have += len(chunk)
          buf += chunk
        return buf

    def write(self, buf):
        """
        Writes the string 'buf' to the transport.

        Throws an TTransportException if there is an error writing.
        """
        pass

    def flush(self):
        """
        Flushes any pending data to the transport.
        """
        pass

TTransport类定义了一组基本的方法,包括isOpen()、open()、close()、read()、readAll()、write()和flush()。子类需要根据具体的传输协议实现这些方法。

然后,我们来看一个使用Thrift.transport.TTransport模块的例子。首先,我们需要将Thrift库导入到Python中:

from thrift.transport import TTransport

接下来,我们可以创建一个传输对象,并打开它以进行读写操作:

transport = TTransport.TMemoryBuffer()
transport.open()

然后,我们可以使用write()方法写入一些数据到传输对象中,使用flush()方法将数据发送到底层传输层:

data = "Hello, Thrift"
transport.write(data)
transport.flush()

接着,我们可以使用readAll()方法从传输对象中读取数据:

read_data = transport.readAll(len(data))
print(read_data)

最后,我们需要关闭传输对象:

transport.close()

以上就是Thrift.transport.TTransport模块的源码及使用示例。该模块提供了一组基本的读写方法,用于与底层传输层交互。通过实现这些方法,我们可以使用Thrift来进行跨语言的远程过程调用。