Block Class Usage¶
Library to work with RecordsKeeper block informaion.
You can collect block information like block’s transaction count, blocktime, blockhash, miner of the block by using block class.You just have to pass the required parameters to invoke the pre-defined functions of Block class.
Import these python libraries first to get started with the functionality.
import requests import json from requests.auth import HTTPBasicAuth import yaml import sys
Entry point for accessing Address class resources.
- URL: Url to connect to the chain ([RPC Host]:[RPC Port])
- Chain-name: chain name
with open("config.yaml", 'r') as ymlfile: cfg = yaml.load(ymlfile)
network = cfg['network'] #network variable to store the network that you want to access
url = network['url'] chain = network['chain']
Importing values from config file.
- User name: The rpc user is used to call the APIs.
- Password: The rpc password is used to authenticate the APIs.
Default value of network is Test-net, you can change its value to select mainnet or testnet
user = network['rkuser'] password = network['passwd']
Now we have node authentication credentials.
Block class is used to call block related function like blockinfo or retrieveBlocks which are used to retrieve block details like block’s hash value, size, nonce, transaction ids, transaction count, miner address, previous block hash, next block hash, merkleroot, blocktime and difficulty of the queried block.
1. Block info to retrieve block information
You have to pass block height as the argument to the blockinfo function call:
- Block height: height of the block of which you want to collect information
blockinfo(block_height) result = blockinfo(block_height) print result['txcount'] #prints transaction count of the block print result['tx'] #prints transaction ids of the block print result['size'] #prints size of the block print result['blockhash'] #prints hash value of the block print result['nonce'] #prints nonce of the block print result['miner'] #prints miner's address of the block print result['nextblock'] #prints next block's hash print result['prevblock'] #prints previous block's hash print result['merkleroot'] #prints merkle root of the block print result['blocktime'] #prints time at which block is mined print result['difficulty'] #prints difficulty of the block
It will return transaction ids, transaction count, nonce, size, hash value, previous block’s hash value, next block hash value, merkle root, difficulty, blocktime and miner address of the block.
2. Retrieve a range of blocks on RecordsKeeper chain
You have to pass range of blocks i.e. blockrange can be 10-15. It can be passed as the argument to the retrieveBlocks function call:
- Block range: range of the block of which you want to collect info
. code-block:: python
. code-block:: python
retrieveBlocks(block_range) result = retrieveBlocks(block_range)
print result[‘blockhash’] #prints hash of the blocks print result[‘miner’] #prints miner of the blocks print result[‘blocktime’] #prints block time of the blocks print result[‘tx count’] #prints transaction count of the blocks
It will return blockhash, miner address, blocktime and transaction count of the queried blocks.