pyrchain

Interface to RChain RNode RPC.

Usage

Pyrchain is Python 3 library for interfacing with RChain RNode gRPC API. The library is distributed via PyPI (https://pypi.org/project/pyrchain/). You can install it for current user by running:

pip3 install --user pyrchain

See setup.py for information about 3rd party library dependencies.

The following snippet shows example usage of the API the library provides. It assumes that you have access to a running RNode instance on localhost with gRPC service listening on TCP port 40401 (default).

import grpc

from rchain.crypto import PrivateKey
from rchain.client import RClient
from rchain.vault import VaultAPI

admin_key = PrivateKey.generate()
alice_key = PrivateKey.generate()

with grpc.insecure_channel('localhost:40401') as channel:
    client = RClient(channel)

    admin_vault_api = VaultAPI(client, admin_key)
    alice_vault_api = VaultAPI(client, alice_key)

    admin_vault_api.create_genesis_vault(None, 100_000)
    admin_vault_api.transfer(None, alice_key.get_public_key().get_address(), 1000)
    assert alice_vault_api.get_balance() == 1000

See ./examples/vaults.py for complete example of vault API usage. See rchain.client.RClient class for available RPC API.

To run the example from this Git repository run:

pipenv install
pipenv run python examples/vaults.py

Development

To update protocol buffers from upstream run:

./update-protobufs
./update-generated

This first command will fetch latest RChain *.proto files from dev branch into ./protobuf directory. The second command will generate gRPC Python code corresponding to the protcol buffers into rchain.pb package (./rchain/pb).

To run unit tests run:

pipenv run python -m unittest rchain/*_test.py

References

• https://github.com/rchain-community/rchain-api

  JavaScript API for RChain RNode RPC

  Includes Rholang parser. Has dApp users already.

• https://github.com/rchain-community/rchain-grpc/

  Python API for RChain RNode RPC

  Seems to cover more of the available gRPC APIs. The author of pyrchain wasn't aware of rchain-grpc existence.