Hive Developer Portal
How to stream transactions on the live Hive blockchain
Full, runnable src of Stream Blockchain Transactions can be downloaded as part of: tutorials/python (or download just this tutorial: devportal-master-tutorials-python-13_stream_blockchain_transactions.zip).
In this tutorial we show you how to stream transactions on the Hive blockchain using the
blockchain class found within the beem library.
Tutorial is demonstrating the typical process of streaming operations on Hive. We will show some information from certain ops, based on certain conditions.
We are using the
blockchain.stream() function provided by beem which returns each operation after it has been accepted by witnesses. By default it follows irreversible blocks which was accepted by all witnesses.
- App setup Configure imports and initialization of libraries
- Stream blocks Stream blocks
- Sample result Sample results
In this tutorial we use 1 package:
beem library and interaction with Blockchain
from beem.blockchain import Blockchain from beem import Hive h = Hive() blockchain = Blockchain(blockchain_instance=h)
Above we create an instance of Blockchain which will give us the ability to stream the live transactions from the blockchain.
Next we create an instance of
stream and then loop through the steam as transactions are available and print them to the screen.
stream = blockchain.stream() for op in stream: if op["type"] == 'comment': if len(op["parent_author"]) == 0: print(op["author"] + " authored a post: " + op["title"]) else: print(op["author"] + " replied to " + op["parent_author"])
For this tutorial, we are only interested in the
comment operation. Then, we check if the author wrote a top-level post or a reply.
Also see: Broadcast Ops
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To Run the tutorial
- review dev requirements
git clone https://gitlab.syncad.com/hive/devportal.git
pip install -r requirements.txt
- After a few moments, you should see a prompt for input in terminal screen.