robonomics-interface 0.3.0

Robonomics wrapper over https://github.com/polkascan/py-substrate-interface created to facilitate programming with Robonomics

robonomics-interface

This is a simple wrapper over https://github.com/polkascan/py-substrate-interface used to facilitate writing code for applications using Robonomics.

Robonomics project: https://robonomics.network/

Robonomics parachain dapp: https://parachain.robonomics.network/

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Installation

pip3 install robonomics-interface

Usage

More info may be found in docstrings in the source code

import robonomicsinterface as RI

Initialization

interface = RI.RobonomicsInterface()

By default, you will only be able to fetch Chainstate info from Frontier parachain and use PubSub pattern.

You can specify another node address (e.g. local), seed to sign extrinsics (more on that later) and custom registry types.

By default, in the Frontier parachain there is a 10 minutes timeout, after which connection becomes broken. But there is also a keep_alive option that keeps websocket opened with ping() calls in an asynchronous event loop. Watch out using asyncio with this option since keep_alive tasks are added to main thread event loop, which is running in another thread. More on that in a docstring of the method.

Simple case: fetch Chainstate

Here, no need to pass any arguments, by

interface = RI.RobonomicsInterface()

you will be able to read any Chainstate info from the Frontier parachain:

num_dt = interface.custom_chainstate("DigitalTwin", "Total")

you can also specify an argument for the query. Several arguments should be put in a list.

There is a dedicated function to obtain Datalog:

record = interface.fetch_datalog(<ss58_addr>)

This will give you the latest datalog record of the specified account with its timestamp. You may pass an index argument to fetch specific record. If you create an interface with a provided seed, you'll be able to fetch self-datalog calling fetch_datalog with no arguments (or just the index argument).

Extrinsics

Providing seed (any raw or mnemonic) while initializing will let you create and submit extrinsics:

interface = RI.RobonmicsInterface(seed:str = <seed>)
hash = interface.custom_extrinsic("DigitalTwin", "create")

hash here is the transaction hash of the succeeded extrinsic. You can also specify arguments for the extrinsic as a dictionary.

There are dedicated functions for recording datalog and sending launch commands:

interface.record_datalog("Hello, Robonomics")
interface.send_launch(<target_addr>, True)

Current nonce definition and manual nonce setting is also possible.

Robonomics Web Services (RWS)

There are as well dedicated methods for convenient usage of RWS.

• Chainstate functions auctionQueue, auction to examine subscriptions auctions:

interface.rws_auction_queue()
inteface.rws_auction(<auction_index>)

• Extrinsincs: bid, set_devices and, the most important, call

interface.rws_bid(<auction_index>, <amount_weiners>)
interface.rws_set_devices([<ss58_addr>, <ss58_addr>])
interface.rws_custom_call(<subscription_owner_addr>,
                           <call_module>,
                           <call_function>,
                           <params_dict>)

There are as well dedicated datalog and launch functions for RWS-based transactions.

interface.rws_record_datalog(<subscription_owner_addr>, <data>)
interface.rws_send_launch(<subscription_owner_addr>, <target_addr>, True)

Subscriptions

There is a subscriptions functional implemented. When initiated, blocks thread and processes new events with a user-passed callback function. Pay attention that this callback may only accept one argument - the event data. Up to now, the only supported events are NewRecord, NewLaunch, Transfer

from robonomicsinterface import RobonomicsInterface, Subscriber, SubEvent

def callback(data):
    print(data)

interface = RobonomicsInterface()
subscriber = Subscriber(interface, SubEvent.NewLaunch, callback, <ss58_addr>)

JSON RPC

WARNING: THIS MODULE IS UNDER CONSTRUCTIONS, USE AT YOUR OWN RISK! TO BE UPDATED SOON.
There is a way to implement robonomics pubsub rpc calls:

interface = RI.RobonomicsInterface()
pubsub = PubSub(interface)
pubsub.peer()

This is an evolving package, it may have errors and lack of functionality, fixes are coming. Feel free to open issues when faced a problem.