chainlibpy

chainlibpy

Tools for Crypto.org Chain wallet management and offline transaction signing

• Installing
• Usage
  • Generating a wallet
  • Signing and broadcasting a transaction
  • Interact with mainnet or testnet
• Acknowledgement
• Development
  • Set up development environment
  • Add pre-commit git hook
  • Generate gRPC code
  • Tox

Installing

Require Python >= 3.8, installing from PyPI repository:

pip install chainlibpy

Usage

Generating a wallet

from chainlibpy import Wallet

# create a wallet
wallet = Wallet.new()
# or you can recover from an mnomic
# mnemonic = "dune car envelope chuckle elbow slight proud fury remove candy uphold puzzle call select sibling sport gadget please want vault glance verb damage gown"
# wallet = Wallet(mnemonic)

print(wallet.private_key)
print(wallet.public_key)
print(wallet.address)

Signing and broadcasting a transaction

Please refer to example/transaction.py for how to start a local testnet with pystarport and change information below to run the examples successfully.

# Obtained from {directory_started_pystarport}/data/chainmaind/accounts.json
# To recover one of the genesis account
- MNEMONIC_PHRASE = "first ... last"
+ MNEMONIC_PHRASE = "REMEMBER TO CHANGE"
# Obtained from {directory_started_pystarport}/data/chainmaind/accounts.json
- TO_ADDRESS = "cro...add"
+ TO_ADDRESS = "REMEMBER TO CHANGE"

Interact with mainnet or testnet

Please refer to example/secure_channel_example.py on how to use secure gRPC channel with server certificate to interact with mainnet or testnet.

Acknowledgement

Thanks to cosmospy for the following:

• referenced the packages to sign transaction and create hd wallet
• python lint config file
• use same sign method

Thanks to eth-utils for the following:

• Conversion of different units without facing precision issues in Python

Development

Set up development environment

Run command below to install dependencies (more about poetry):

poetry install

Add pre-commit git hook

To set up the git hook scripts, so that pre-commit will run automatically on git commit:

pre-commit install

Generate gRPC code

poetry shell
./generated_protos.sh

NOTE: By default, master branch of cosmos-sdk is used. Use command below to download a different version:

./generated_protos.sh -COSMOS_REF=v0.44.5

If more generated gRPC code is needed in the future, please add the path to .proto file needed here in generated_protos.sh:

# Add .proto files here to generate respective gRPC code
PROTO_FILES="
$COSMOS_SDK_DIR/proto/cosmos/auth/v1beta1/auth.proto
+$COSMOS_SDK_DIR/proto/other.proto
...

Tox

Tox is a tool to automate and standardize testing processes in Python.

For this project, the list of environment that will be run when invoking tox command is py{38,39}. Hence we need to set up Python 3.8 and 3.9 for this project. Run command below to set a local application-specific Python version (in this case 3.8 and 3.9) with pyenv:

pyenv local 3.8.a 3.9.b

Note: a and b are python versions installed on your computer by pyenv.

After running command above, a .python-version file will be generated, which means python versions inside .python-version are presented for this project. Now, running command tox should succeed without prompting environment missing error.

Run command below to verify:

poetry run tox
# or
poetry shell
tox

It is also recommended to run tox command before pushing a commit.