Last active
April 2, 2018 17:50
-
-
Save CowboyJim/3fd5735f6aea75a28dae5e3ddbe2099b to your computer and use it in GitHub Desktop.
Create and start Ethereum blockchain network
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #!/usr/bin/env python | |
| """ | |
| Simple script that creates a four node Ethereum private blockchain | |
| network using the geth client. Please adjust the script constants | |
| to match your environment. | |
| """ | |
| import sys | |
| from subprocess import call | |
| import os.path | |
| import time | |
| # !!! Change values for your computer !!! | |
| data_dir = "/Users/jboone/work/blog/ethereum" | |
| log_dir = "/tmp/eth_logs" | |
| num_nodes = 4 | |
| base_port = 30301 | |
| rpc_base = 8101 | |
| genesis_file = 'genesis_file.json' | |
| password_file = "pw.txt" | |
| password = "admin" | |
| def createGenesisBlock(data_dir): | |
| if not os.path.isfile(genesis_file): | |
| genesis_block=""" | |
| { | |
| "nonce": "0x0000000000000042", | |
| "timestamp": "0x0", | |
| "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000", | |
| "extraData": "Custom Genesis Block", | |
| "gasLimit": "0x8000000", | |
| "difficulty": "0x0100", | |
| "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000", | |
| "coinbase": "0x3333333333333333333333333333333333333333", | |
| "alloc": { | |
| } | |
| }""" | |
| f = open(genesis_file,"w") | |
| f.write(genesis_block) | |
| f.write("\n") | |
| f.close() | |
| if not os.path.exists(data_dir): | |
| # Create the genesis block | |
| print "Create a new blockchain" | |
| call(['geth',"--datadir",data_dir,"init", genesis_file]) | |
| def createPasswordFile(): | |
| if not os.path.isfile(password_file): | |
| f=open(password_file,"w") | |
| f.write(password) | |
| f.close() | |
| def createUserAccount(node_num, cur_data_dir): | |
| keystore_dir = cur_data_dir + "/keystore" | |
| if not os.path.exists(keystore_dir): | |
| print "Creating keystore directory" | |
| os.makedirs(keystore_dir) | |
| if not os.listdir(keystore_dir): | |
| print "Creating an account for node " + str(node_num) | |
| call(['geth',"--datadir",cur_data_dir,"--password", password_file, | |
| "account","new"]) | |
| def unlockUserAccount(num, rpc): | |
| print "Unlock the account for node {0}".format(num) | |
| url="http://localhost:" + str(rpc) | |
| call(['geth','--exec',"personal.unlockAccount(eth.accounts[0],'admin',99999)", | |
| 'attach', url]) | |
| def createNode(num, cur_data_dir, port, rpc, log_dir): | |
| # Create the data directory if it doesn't exist | |
| if not os.path.exists(cur_data_dir): | |
| print "Created data directory for node {0}".format(num) | |
| os.makedirs(cur_data_dir) | |
| cmd = """nohup geth --datadir="{0}" --verbosity 4 --ipcdisable \ | |
| --rpcapi \"admin,debug,eth,miner,net,personal,shh,txpool,web3\" \ | |
| --networkid 12345 --port {2} --rpc --rpcport {3} --nodiscover \ | |
| --identity \"TestNode{6}\" --autodag --rpcaddr \"0.0.0.0\" \ | |
| 2>> {4}/node{5}.log & | |
| """.format(cur_data_dir,num, port, rpc, log_dir, num, num ) | |
| #print cmd | |
| print "Launching node {0} in the background".format(num) | |
| call(cmd, shell=True) | |
| def main(argv): | |
| # Create the log directory if it doesn't exist | |
| if not os.path.exists(log_dir): | |
| print "Creating log directory" | |
| os.makedirs(log_dir) | |
| createPasswordFile() | |
| for num in range(0, num_nodes): | |
| port = base_port + num | |
| rpc = rpc_base + num | |
| cur_data_dir = "{0}/node{1}".format(data_dir, num) | |
| createGenesisBlock(cur_data_dir) | |
| createUserAccount(num,cur_data_dir) | |
| createNode(num, cur_data_dir, port, rpc, log_dir) | |
| # Give the node time to start | |
| time.sleep(3) | |
| unlockUserAccount(num,rpc) | |
| if __name__ == "__main__": | |
| main(sys.argv[1:]) | |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment