python-monerorpc

python-monerorpc

DISCLAIMER: The repository that should be worked on is located at the monero-ecosystem.

python-monerorpc is an improved version of python-jsonrpc for Monero (monerod rpc, monero-wallet-rpc).

python-monerorpc was originally forked from python-bitcoinrpc.

It includes the following generic improvements:

• HTTP connections persist for the life of the AuthServiceProxy object using requests.Session
• sends protocol 'jsonrpc', per JSON-RPC 2.0
• sends proper, incrementing 'id'
• uses standard Python json lib
• can optionally log all RPC calls and results
• JSON-2.0 batch support (mimicking batch)
  • JSON-2.0 batch doesn't seem to work with monero.
  • The batch functionality is mimicked and just requests the given methods one after another.
  • The result is a list of dictionaries.

It also includes some more specific details:

• sends Digest HTTP authentication headers
• parses all JSON numbers that look like floats as Decimal, and serializes Decimal values to JSON-RPC connections.

What does it do?

python-monerorpc communicates with monero over RPC.

That includes:

• monerod rpc as well as
• monero-wallet-rpc.

python-monerorpc takes over the actual HTTP request containing all the necessary headers.

Compared to similar projects:

• monero-python

  • monero-python
  • The module implements a json RPC backend (monerod rpc, monero-wallet-rpc).
  • It implements implementations around this backend (accounts, wallets, transactions, etc. )
  • It offers helpful utilities like a monero wallet address validator.

• A practical difference:

  • Should a RPC method change or a new one should be added, monero-python would have to adapt its backend and the implementations around it, while with python-monerorpc you just have to modify the property or use a new method like:

      rpc_connection.getbalance()  # -> rpc_connection.get_balance()
      rpc_connection.new_method()
  

Errors

The JSONRPCException is thrown in the event of an error.

One exception to that rule is when receiving a JSONDecodeError when converting the response to JSON. In this case a ValueError including the HTTP response is raised.

This error was not handled before and directly raised a JSONDecodeError. Since JSONDecodeError inherits from ValueError nothing really changes. You should handle ValueError in addition to just JSONRPCException when working with python-monerorpc.

TODO: An improved error handling.

• Provide detailed information.
• Separate into several causes like connection error, conversion error, etc.

Installation:

From PyPI

To install python-monerorpc from PyPI using pip you just need to:

$ pip install python-monerorpc

From Source

$ python setup.py install --user

Note: This will only install monerorpc. If you also want to install jsonrpc to preserve backwards compatibility, you have to replace monerorpc with jsonrpc in setup.py and run it again.

Examples:

Example usage monerod (get info):

    from monerorpc.authproxy import AuthServiceProxy, JSONRPCException

    # initialisation, rpc_user and rpc_password are set as flags in the cli command
    rpc_connection = AuthServiceProxy(service_url='http://{0}:{1}@127.0.0.1:18081/json_rpc'.format(rpc_user, rpc_password))

    info = rpc_connection.get_info()
    print(info)

    # rpc_user and rpc_password can also be left out (testing, develop, not recommended)
    rpc_connection = AuthServiceProxy(service_url='http://127.0.0.1:18081/json_rpc')

Example usage monerod (special characters in RPC password).

This is also the recommended way to use passwords containing special characters like some_password#-+.

When both ways are used (username/password in the URL and passed as arguments), the arguments' values will be predominant.

    from monerorpc.authproxy import AuthServiceProxy, JSONRPCException

    # When leaving rpc_user and rpc_password in the URL,
    # you can still pass those values as separate paramaters.
    rpc_connection = AuthServiceProxy(service_url='http://127.0.0.1:18081/json_rpc', username=rpc_user, password=rpc_password)

    # Or use both ways.
    rpc_connection = AuthServiceProxy(service_url='http://{0}@127.0.0.1:18081/json_rpc'.format(rpc_user), password=rpc_password)

Example usage monerod (get network type):

  from monerorpc.authproxy import AuthServiceProxy, JSONRPCException
  rpc_connection = AuthServiceProxy(service_url='http://{0}:{1}@127.0.0.1:18081/json_rpc'.format(rpc_user, rpc_password))

  result = None
  network_type = None
  try:
      result = rpc_connection.get_info()
  except (requests.HTTPError,
          requests.ConnectionError,
          JSONRPCException) as e:
      logger.error('RPC Error on getting address' + str(e))
      logger.exception(e)
  # Check network type
  network_type = result.get('nettype')
  if not network_type:
      raise ValueError('Error with: {0}'.format(result))
  print(network_type)

Example usage monerod (on get block hash):

  from monerorpc.authproxy import AuthServiceProxy, JSONRPCException
  rpc_connection = AuthServiceProxy(service_url='http://{0}:{1}@127.0.0.1:18081/json_rpc'.format(rpc_user, rpc_password))

  params = [2]
  hash = rpc.on_get_block_hash(params)
  print(hash)

Example usage monero-wallet-rpc (get balance):

    from monerorpc.authproxy import AuthServiceProxy, JSONRPCException

    # initialisation, rpc_user and rpc_password are set as flags in the cli command
    rpc_connection = AuthServiceProxy(service_url='http://{0}:{1}@127.0.0.1:18083/json_rpc'.format(rpc_user, rpc_password))

    balance = rpc_connection.get_balance()
    print(balance)

Example usage monero-wallet-rpc (make transfer):

    from monerorpc.authproxy import AuthServiceProxy, JSONRPCException

    # initialisation, rpc_user and rpc_password are set as flags in the cli command
    rpc_connection = AuthServiceProxy(service_url='http://{0}:{1}@127.0.0.1:18083/json_rpc'.format(rpc_user, rpc_password))

    destinations = {"destinations": [{"address": "some_address", "amount": 1}], "mixin": 10}
    result = rpc_connection.transfer(destinations)
    print(result)

Example usage monero-wallet-rpc (batch):

    from monerorpc.authproxy import AuthServiceProxy, JSONRPCException
    import pprint

    # initialisation, rpc_user and rpc_password are set as flags in the cli command
    rpc_connection = AuthServiceProxy(service_url='http://{0}:{1}@127.0.0.1:18083/json_rpc'.format(rpc_user, rpc_password))

    # some example batch
    params={"account_index":0,"address_indices":[0,1]}
    result = rpc.batch_([ ["get_balance"], ["get_balance", params] ])
    pprint.pprint(result)

    # make transfer and get balance in a batch
    destinations = {"destinations": [{"address": "some_address", "amount": 1}], "mixin": 10}
    result = rpc.batch_([ ["transfer", destinations], ["get_balance"] ])
    pprint.pprint(result)

Logging:

Logging all RPC calls to stderr:

    from monerorpc.authproxy import AuthServiceProxy, JSONRPCException
    import logging

    logging.basicConfig()
    logging.getLogger("MoneroRPC").setLevel(logging.DEBUG)

    rpc_connection = AuthServiceProxy(service_url='http://{0}:{1}@127.0.0.1:18081/json_rpc'.format(rpc_user, rpc_password))

    print(rpc_connection.get_info())

Produces output on stderr like:

    DEBUG:MoneroRPC:-1-> get_info []
    DEBUG:MoneroRPC:<-1- {u'result': {u'incoming_connections_count': 0, ...etc }

Errors:

Possible errors and error codes:

• no code
  • Returns the error contained in the RPC response.
• -341
  • could not establish a connection, original error: {}
  • including the original exception message
• -342
  • missing HTTP response from server
• -343
  • missing JSON-RPC result
• -344
  • received HTTP status code {}
  • including HTTP status code other than 200

Testing and creating requirements.txt

You won't ever need this probably - This is helpful when developing.

pip-tools is used to create requirements.txt.

• There is requirements.in where dependencies are set and pinned.
• To create the requirements.txt, run update_requirements.sh which basically just calls pip-compile.

Note:

• There also is build_requirements.txt which only contains pip-tools. I found, when working with virtual environments, it is necessary to install pip-tools inside the virtual environment as well. Otherwise pip-sync would install outside the virtual environment.

A test and development environment can be created like this:

    # Create a virtual environment 'venv'.
    python -m venv venv
    # Activate the virtual environment 'venv'.
    . /venv/bin/activate
    # Install 'pip-tools'.
    pip install --upgrade -r build_requirements.txt
    # Install dependencies.
    pip-sync requirements.txt
    ...
    # Deactivate the virtual environment 'venv'.
    deactivate

Run unit tests using pytest:

    # virtualenv activated (see above)
    pytest -s -v --cov monerorpc/ tests.py

Run unit tests on all supported python versions:

    tox -q

Run unit tests on a subset of the supported python versions:

    tox -q -e py36,py37

Note: The chosen python versions have to be installed on your system.

Authors

• Norman Moeschter-Schenck - Initial work - normoes

See also the list of contributors who participated in this project.