Yesterday, blockbrother dev Hive account@bennierex updated Nozzle, our RPC-client for the Steem blockchain.

Nozzle was born out of requirements for other projects of Hive account@blockbrothers (Steemify, SteemTurbine, and VoteBot), to have a more stable and low-level RPC-client for the steemd nodes of the Steem network.

Nozzle is open-source, so feel free to use it for your own projects.
Get it from our Github repo: https://github.com/blockbrothers/nozzle

Bug Fixes

A total of three issues were fixed, two of them were still open until today;

Issue #1 - Getting nodes property from RPCClient causes infinite loop.
Issue #2 - Unable to stream blocks.
Issue #3 - Possible infinite loop in call-method of RPCClient.

Issue #1 was fixed by creating a copy of the nodes list by iterating the itertools.cycle.

Issue #2 was fixed by changing the constant STEEMIT_BLOCK_INTERVAL to STEEM_BLOCK_INTERVAL, as it seems to have changed on the RPC-nodes.

Issue #3 was fixed by refactoring the while-loop in SteemdClient.stream_blocks() method.

New Features

I've added a few high-level methods to nozzle.client.SteemdClient to get accounts, get account reputation, get witness accounts by id, and get witness accounts by accountname:

from nozzle import Steem
s = Steem(nodes=['https://api.steemit.com'])
s.get_accounts(['blockbrothers', 'bennierex', 'eqko', 'exyle', 's3rg3'])
s.get_account_reputation('blockbrothers')
s.get_witnesses_by_account(['blockbrothers', 'aggroed'])
s.get_witnesses_by_id([14639, 14503])

Enhancement

SteemdClient.get_blocks() and SteemdClient.stream_blocks() now always yield a block, even if it is None. It's up to the consumer to decide what to do when that happens.

Installation / upgrade

The new version, v0.1.2, is available on pypi.

To install, simply run pip install steem-nozzle.

To upgrade, run pip install --upgrade steem-nozzle.

Planned future enhancements

Add more high-level functions.
Make nozzle compatible with Appbase.
Performance improvements.
Communities/Hivemind/SMT compatibility (when available)

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