Differential D3193 Diff 9124 contrib/devtools/update-chainparams.py

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contrib/devtools/update-chainparams.py

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				#!/usr/bin/env python3
				# Copyright (c) 2019 The Bitcoin developers
				# Distributed under the MIT software license, see the accompanying
				# file COPYING or http://www.opensource.org/licenses/mit-license.php.

				import argparse
				import json
				import subprocess
				import re

				parser = argparse.ArgumentParser(description="Fetch a block from the bitcoin HTTP RPC to update chainparams (nMinimumChainWork and defaultAssumeValid).\n\nNOTE: bitcoind must have `--rest=1` set (either as a cli argument or in the config)!",
				deadalnixUnsubmitted Done Inline Actions bitcoin-cli doesn't need this. How come ? Also, multiline stings are great. deadalnix: bitcoin-cli doesn't need this. How come ? Also, multiline stings are great.
				jasonbcoxAuthorUnsubmitted Done Inline Actions `--rest=1` enables the node to accept HTTP RPC request (otherwise it rejects them). bitcoin-cli doesn't care. jasonbcox: `--rest=1` enables the node to accept HTTP RPC request (otherwise it rejects them). bitcoin…
				formatter_class=argparse.RawTextHelpFormatter)
				parser.add_argument('--hostaddr', '-a',
				default="localhost",
				help="Host address of the HTTP RPC bitcoind server to call for fetching chain info. (defaults to `localhost`)")
				parser.add_argument('--hostport', '-p', default="8332",
				help="Host port of the HTTP RPC bitcoind server to call for fetching chain info. (defaults to 8332)")
				parser.add_argument('--testnet', '-t', action="store_true",
				help="If set, testnet chainparams will be updated instead of mainnet chainparams. If testnet is set, but hostport is not set, hostport will default to 18332.")
				parser.add_argument('--blockhash', '-b',
				help="(optional) The block hash to update chainparams with. If not specified, bestblockhash is used.")
				args = parser.parse_args()


				def curl(url):
				# Call bitcoin HTTP RPC using curl
				print("Fetching URL: {}".format(url))
				curlArgs = ['curl', '-s', url]
				p = subprocess.Popen('curl -s ' + url, stdout=subprocess.PIPE, shell=True)
				(output, err) = p.communicate()
				status = p.wait()
				if status != 0:
				print("curl error status: {}\nSee https://curl.haxx.se/libcurl/c/libcurl-errors.html for error descriptions.".format(status))
				exit(1)
				return json.loads(output.decode('utf8'))


				def replaceChainParams(fileContents, chainParamsClass, chainwork, blockhash):
				# Replace chainparams with the new values for the specified chain params class
				fileContents = re.sub('(' + chainParamsClass + '.?nMinimumChainWork.?")(\w+)("\);)',
				'\g<1>' + chainwork + '\g<3>', fileContents, flags=re.MULTILINE \| re.DOTALL)
				fileContents = re.sub('(' + chainParamsClass + '.?defaultAssumeValid.?")(\w+)("\);)',
				'\g<1>' + blockhash + '\g<3>', fileContents, flags=re.MULTILINE \| re.DOTALL)
				return fileContents
				deadalnixUnsubmitted Done Inline Actions This doesn't need to be in its own function. It just cause the flow to jump back and forth for no good reasons. deadalnix: This doesn't need to be in its own function. It just cause the flow to jump back and forth for…
				jasonbcoxAuthorUnsubmitted Done Inline Actions Good point. jasonbcox: Good point.


				port = args.hostport
				if args.testnet and port == '8332':
				port = '18332'
				url = args.hostaddr + ':' + port

				# Get best block hash and chainwork
				chaininfo = curl(url + '/rest/chaininfo.json')

				chainTestnet = chaininfo['chain'] == 'test'
				if args.testnet != chainTestnet:
				print("The chain network specified did not match the one given by the host node!")
				print("Did you mean to call with a different `--hostaddr` or `--hostport`, or with `--testnet` set?")
				exit(1)

				blockhash = chaininfo['bestblockhash']
				chainwork = chaininfo['chainwork']
				if args.blockhash:
				blockhash = args.blockhash
				print("Fetching chainwork for block {}".format(blockhash))
				block = curl(url + '/rest/block/' + blockhash + '.json')
				chainwork = block['chainwork']

				# Read-write to chainparams.cpp
				f = open('../../src/chainparams.cpp', 'r+')
				chainparams = f.read()

				# Replace chainparams values
				if args.testnet:
				chainparams = replaceChainParams(
				chainparams, 'TestNetParams', chainwork, blockhash)
				else:
				chainparams = replaceChainParams(
				chainparams, 'MainParams', chainwork, blockhash)

				f.seek(0)
				f.write(chainparams)
				f.close()