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The Python Banyan Framework

The Python Banyan Framework is a lightweight, reactive framework used to create flexible, non-blocking, event driven, asynchronous applications.

Python Banyan comes with full documentation that includes a User's Guide with hands-on examples, as well documentation for the OneGPIO Project that allows you to quickly and easily build reusable GPIO projects for the Arduino, ESP-8266, and Raspberry Pi.

Base class API's may be viewed here.

It is being used by Palace Games to concurrently monitor hundreds of real-time sensors and actuators.

Based on a network connected Publish/Subscribe model, Banyan components publish user defined protocol messages in the form of Python dictionaries.
A Banyan protocol message may contain Numpy data.
Applications may reside on a single computer or be distributed across multiple computers without having to change source code.
Compatible Banyan Frameworks are available for JavaScript, Ruby, and Java. Components written in any of these languages can interact with components of a differing language without modification.
Runs on Python 2 or Python 3 (recommended).

To install, view the full installation instructions.

A Simple Banyan Echo Server:

import sys
from python_banyan.banyan_base import BanyanBase


class EchoServer(BanyanBase):
    """
    This class is a simple Banyan echo server
    """
    def __init__(self, ):

        # initialize the parent
        super(EchoServer, self).__init__(process_name='EchoServer')

        # subscribe to receive 'echo' messages from the client
        self.set_subscriber_topic('echo')

        # wait for messages to arrive
        try:
            self.receive_loop()
        except KeyboardInterrupt:
            self.clean_up()
            sys.exit(0)

    def incoming_message_processing(self, topic, payload):
        """
        Process incoming messages from the client
        :param topic: message topic
        :param payload: message payload
        """
        # republish the message with a topic of reply
        self.publish_payload(payload, 'reply')
        
        # extract the message number from the payload
        print('Message number:', payload['message_number'])

A Simple Banyan Echo Client:

import sys
from python_banyan.banyan_base import BanyanBase


class EchoClient(BanyanBase):
    """
    This is a simple echo client derived from the BanyanBase class. 
    It sends out a series of messages and expects an
    echo reply from the server.
    """

    def __init__(self):

        # initialize the parent
        super(EchoClient, self).__init__(process_name='EchoClient')

        # accept banyan messages with the topic of reply
        self.set_subscriber_topic('reply')

        # sequence number of messages and total number of messages to send
        self.message_number = self.number_of_messages = 10

        # send the first message - make sure that the server is already started
        self.publish_payload({'message_number': self.message_number}, 'echo')

        # get the reply messages
        try:
            self.receive_loop()
        except KeyboardInterrupt:
            self.clean_up()
            sys.exit(0)

    def incoming_message_processing(self, topic, payload):
        """
        Process incoming messages received from the echo client
        :param topic: Message Topic string
        :param payload: Message Data
        """

        # When a message is received and its number is zero, finish up.
        if payload['message_number'] == 0:
            print(str(self.number_of_messages) + ' messages sent and received. ')
            input('Press enter to exit.')
            self.clean_up()
            sys.exit(0)
        # bump the message number and send the message out
        else:
            self.message_number -= 1
            if self.message_number >= 0:
                self.publish_payload({'message_number': self.message_number}, 'echo')

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