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A simple protocol based on json representation of python dictionaries

Project description

Python Dictionary Transfer Protocol

pydtp is a package defining a protocol for transparently accessing a remote server with function calls passing lightweight arguments.

pydtp defines three classes:

  • a Server class based on socketserver.TCPServer
  • an abstract Handler class to implement to define the Server-responses
  • an abstract Client class to implement to define the Client interface

The functions implemented on the Client class are redirected to the server class encoding the arguments and the return value in the most transparent way.

Dependencies

The package is developed for Python3.

The package requires numpy plus the standard python libraries for both the client and server sides.

Example

Define the client implementing two functions, that just redirect the functions to the query:

import pydtp 

class SimpleClient (pydtp.Client) :
  def add_one ( self, num ):
    return self.query ( 'add_one', [num] ) 

  def capitalize ( self, *strings):
    return self.query ( 'capitalize', [strings] ) 

The query function hides the complexity and allow to call functions implemented in a Handler:

import pydtp 

class SimpleHandler (pydtp.Handler):
  def add_one ( self, num ):
    return num + 1 

  def capitalize ( self, strings ):
    return {k: k.capitalize() for k in strings} 

The server is then instantiated and started on localhost and on a port.

server = pydtp.Server ( ('localhost', 12345), SimpleHandler )
server.start() 

The client class is instantiated indicating the address and the port

client = SimpleClient ( ('localhost', 12345) ) 
client.add_one ( 3 ) ## == 4
client.capitalize ( 'test' ) ## == "Test"

Project details


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