mini-syndicate-py/syndicate/mini/protocol.py

import preserves
from preserves import Record, Symbol

## Enrolment
Connect = Record.makeConstructor('Connect', 'scope')
Peer = Record.makeConstructor('Peer', 'scope')

## Bidirectional
Commit = Record.makeConstructor('Commit', '')

## Client -> Server
Assert = Record.makeConstructor('Assert', 'endpointName assertion')
Clear = Record.makeConstructor('Clear', 'endpointName')
Message = Record.makeConstructor('Message', 'body')

## Server -> Client
Add = Record.makeConstructor('Add', 'endpointName captures')
Del = Record.makeConstructor('Del', 'endpointName captures')
Msg = Record.makeConstructor('Msg', 'endpointName captures')
Err = Record.makeConstructor('Err', 'detail')

## Bidirectional
Ping = Record.makeConstructor('Ping', '')
Pong = Record.makeConstructor('Pong', '')

## Standard Syndicate constructors
Observe = Record.makeConstructor('observe', 'specification')
Capture = Record.makeConstructor('capture', 'specification')
Discard = Record.makeConstructor('discard', '')

class Decoder(preserves.Decoder):
    def __init__(self, *args, **kwargs):
        super(Decoder, self).__init__(*args, **kwargs)
        _init_shortforms(self)

class Encoder(preserves.Encoder):
    def __init__(self, *args, **kwargs):
        super(Encoder, self).__init__(*args, **kwargs)
        _init_shortforms(self)

def _init_shortforms(c):
    c.set_shortform(0, Discard.constructorInfo.key)
    c.set_shortform(1, Capture.constructorInfo.key)
    c.set_shortform(2, Observe.constructorInfo.key)