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README.md

README.md

 
 

genesis.json

genesis.json

 
 

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Fast Setup (only after previously setting up using the "Slow Setup")

  • Change the Shell script to match the directory that you setup in the "Slow Setup" steps.

  • Run the Shell script to automatically run a Geth Node in a terminal tab, launches MIST that waits 5 seconds before trying to attach to the Geth Node from a second terminal tab, waits 5 seconds before trying to run a Geth JavaScript Console that attaches to the Geth Node in a third terminal tab, and opens Visual Studio Code from a fourth terminal tab.

    bash launch.sh

  • Click "Launch Application" in MIST

  • Go to "Contracts"

  • Click "Deploy Contracts"

  • Copy/paste a Solidity Smart Contract into the "SOLIDITY CONTRACT SOURCE CODE" section to check if it compiles

Slow Setup

  • Setup Geth Node (independent of MIST or Parity) as an Ethereum client using Ethereum Protocol that allows for interaction with the Private Network blockchain.

  • Make a directory

    mkdir /Users/Ls/code/blockchain/geth-node;
cd /Users/Ls/code/blockchain/geth-node

  • Create genesis.json file and chaindata/ folder, where:

    • coinbase is where mining goes to
    • difficulty is difficulty to mine a new block (0x20000 is fast)
    • gasLimit is upper limit to the amount of assembler OPCODEs a miner is allowed to perform for transactions on blockchain that require payment of gas to miners
    • timestamp - defines the time when this block was generated (i.e. 0x00 is ~1970 epoch)
    • alloc - used to add Ether to pre-allocated accounts
    • config -
      • chainID - do not set to 1 since this is the main net

  • Initial genesis.json

{
  "coinbase"   : "0x0000000000000000000000000000000000000001",
  "difficulty" : "0x20000",
  "extraData"  : "",
  "gasLimit"   : "0x8000000",
  "nonce"      : "0x0000000000000042",
  "mixhash"    : "0x0000000000000000000000000000000000000000000000000000000000000000",
  "parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
  "timestamp"  : "0x00",
  "alloc": {},
  "config": {
        "chainId": 15,
        "homesteadBlock": 0,
        "eip155Block": 0,
        "eip158Block": 0
    }
}
  • Terminal Tab #1 - Initialise Private Network and configure Geth to save blockchain data with Genesis Block inside the chaindata/ folder, informing Geth where genesis.json blockchain configuration is located (cannot be in chaindata/)
geth --datadir=./chaindata/ init ./genesis.json
  • Terminal Tab #1 - Start Geth Node using ./chaindata/ folder. It starts the network with same Chain ID as defined in the genesis.json file. Geth listens for incoming connections on port 30303 using an IPC file geth.ipc that is created when it is running to allow processes to connect to Geth (i.e. with geth attach, MIST / Ethereum Wallet). With the Private Network it has no other Nodes and nothing to synchronise. Note: Verbosity of 3 is recommended.
geth --datadir=./chaindata/ --verbosity 5

  • Terminal Tab #2 - Use MIST to run Ethereum Wallet Dapp in MIST browser at http://wallet.ethereum.org. MIST binds Web3 to window object to inject it into the browser so Web3.js may be used to manage accounts (i.e. allows selecting one account from web3.eth.accounts to be visible in MIST via localhost:8545 by clicking the Manage Identity button), deploy or interact with contracts

  • Add MIST to PATH - https://trello.com/c/XaTEDu12/97-mist-setup-macos

  • Terminal Tab #2 - Start MIST after Geth running. Ensure to identify where the IPC file location of the Private Chain is to MIST (to avoid error Fatal: Error starting protocol stack: listen udp :30303: bind: address already in use).

    • Warning: Using loglevel "trace" uses creates a very large geth.log file quickly
cd /Users/Ls/code/blockchain/geth-node;

/Applications/Mist.app/Contents/MacOS/mist --help

open -a mist --args --mode "mist" \
  --node "geth" \
  --gethpath "/usr/local/bin/geth" \
  --rpc "/Users/Ls/code/blockchain/geth-node/chaindata/geth.ipc" \
  --node-ipcpath "/Users/Ls/code/blockchain/geth-node/chaindata/geth.ipc" \
  --node-datadir "/Users/Ls/code/blockchain/geth-node/chaindata/geth.ipc" \
  --logfile "/Users/Ls/code/blockchain/geth-node/geth.log" \
  --loglevel "trace" \
  --skiptimesynccheck true

  • Terminal Tab #3 - View Logs

    cd /Users/Ls/code/blockchain/geth-node;
tail -f ./geth.log;

  • In MIST click "LAUNCH APPLICATION" button shown in the popup

  • Terminal Tab #2 - Identify the IPC file location to Geth after MIST launches and Launch Application has been clicked, to load the JavaScript RPC Geth Console (JSRE REPL) on the already running Geth instance (communication with Geth through RPC on port 8545).

geth attach --help;
geth attach "/Users/Ls/code/blockchain/geth-node/chaindata/geth.ipc" 

* Outputs the following

Welcome to the Geth JavaScript console!

instance: Geth/v1.7.3-stable/darwin-amd64/go1.9.2
 modules: admin:1.0 debug:1.0 eth:1.0 miner:1.0 net:1.0 personal:1.0 rpc:1.0 txpool:1.0 web3:1.0

> web3.eth.accounts
[]

  • In MIST go to the Wallet Tab

    • Click "Add Account"

    • Click "Create new account"

    • Enter a password (i.e. test123456)

      • Note: This shows a popup:

        "Make sure you backup your keyfiles AND password! You can find your keyfiles folder using the main menu -> Accounts -> Backup -> Accounts. Keep a copy of the "keystore" folder where you can't lose it!"

      • Note: It will create the Wallet file in the directory /Users/Ls/code/blockchain/geth-node/chaindata/keystore/UTC--2017-12-29xxxxxxxxxxx--<ACCOUNT_NUMBER_WITHOUT_0x_PREFIX>

    • Click the new account "Main account (Etherbase) 0x<ACCOUNT_NUMBER>" and then click "AUTHORIZE" to share the identity with Ethereum Wallet DApp (giving it permission to view public account information including accounts and balances)

    • Now in the Wallet Tab under the heading "WALLET CONTRACTS" it says:

      "Once you have more than 1 Ether you can create more sophisticated contracts. Wallets are smart contracts that allow your funds to be controlled by multiple accounts. They can have an optional daily limit on withdrawals to increase security. Create your own custom contracts on the Contracts tab."

  • Terminal Tab #2 - Use Geth JavaScript console to show the Accounts using Web3.js:

> web3.eth.accounts
["0x<ACCOUNT_NUMBER>"]
  • Terminal Tab #2 - Start Mining in the Private Network to earn Ether so we may create custom Contracts in the Contracts Tab of MIST. Enter the amount of threads it should start mining with:
> miner.start(1);

  • Optional Alternative: Try downloading EthMiner, which also supports GPU mining with ethminer -G.

  • Wait about 5 minutes for the DAG to generate before CPU mining starts, since it must first generate the DAG (see Generating DAG in progress in Geth logs with a percentage complete shown i.e. epoch=1 percentage=42). Reference: https://github.com/ethereum/wiki/wiki/Mining

  • In MIST and Terminal Tab #1 - Check latest Block being mined until Account has an Ether balance of at least 1 ETH

  • Terminal Tab #2 - Stop Mining

> miner.stop();

  • In MIST, Deploy the FixedSupplyContract.sol code to the Private Network.

    • Check how much Ether we have CPU mined (say 50 ETH)
    • Go to "Contracts" tab
      • Click "Deploy New Contract" button
        • Select the new Account for the "FROM" field value
        • Do not send any Ether
        • Copy/Paste the Sample FixedSupplyContract.sol code into "SOLIDITY CONTRACT SOURCE CODE" text field value
        • MIST compiles the Solidity Contract to Bytecode
        • Select the "Fixed Supply Token" interface as the Contract to Deploy
        • Click "DEPLOY"
        • Click "SEND TRANSACTION"
        • Go to Wallet Tab > View "LATEST TRANSACTIONS"
        • Re-start Mining
          • Note: Each block mined for the transaction gives a block confirmation. After ~12 confirmations the contract is published on the Private Network

  • In MIST,

    • Go to "Contracts" tab
      • Select the Deployed Contract that was saved in the Wallet
      • View the options available:
        • Copy Contract Address
        • Show Contract QR Code
        • Show Contract JSON Interface (allows execution of the contract)
        • "Call" Functions are under heading "READ FROM CONTRACT"
        • "Transaction" Functions are under heading "WRITE TO CONTRACT" (i.e. transfer, transferFrom, approve)
        • Copy the Transaction Hash

  • Terminal Tab #2 - JavaScript RPC Geth Console

var tx = web3.eth.getTransaction('<INSERT_TRANSACTION_HASH_OF_DEPLOYED_CONTRACT>');
  • Estimate Gas
web3.eth.estimateGas(tx);
  • Transaction Receipt
web3.eth.getTransactionReceipt('<INSERT_TRANSACTION_HASH_OF_DEPLOYED_CONTRACT>', function(err, res) { console.log(JSON.stringify(res, null, 2)) });

rm -rf node_modules

npm install --save-dev \
  web3@1.0.0-beta.27 \
  net@1.0.2 \
  solc@0.4.19 \
  fs@0.0.1-security

npm install
  • Terminal Tab #2 - Deploy New Contract using Web3.js instead of via MIST
node scripts/main.js

* IMPORTANT NOTE: Errors with `authentication needed: password or unlock` were caused because the `unlockAccount` is a Promise that must be resolved before contract deployment.

* Terminal Tab #2 - Successfuly deployment should display:

  * EXAMPLE OUTPUT
    * `transactionHash` event (or `error` event)

Web3.js version: 1.0.0-beta.27
OS Platform: darwin
Geth is not mining
Accounts in Private Network: 57
Coinbase Address:  0x487f2778ec7d0747d6e26af80148ec471a08b339
Geth Node Listening: true
Contract gas estimate: 518329
Created New Account with address: 0x8d59cA1Edfb4b7644A875325A003E4CB0Ae06b9B
New Default address set to:  0x8d59cA1Edfb4b7644A875325A003E4CB0Ae06b9B
Promise.all resolved with:  [ undefined,
  undefined,
  '0x8d59cA1Edfb4b7644A875325A003E4CB0Ae06b9B',
  '0x487f2778ec7d0747d6e26af80148ec471a08b339' ]
Coinbase Address Balance:  4985000000000000000000
Promise.all resolved with:  [ '0x487f2778ec7d0747d6e26af80148ec471a08b339', true, true ]
Creating contract instance defined in JSON interface object
Promise resolved with FSTContract, and senderAddress:  0x487f2778ec7d0747d6e26af80148ec471a08b339
Successfully submitted contract creation. Transaction hash: 0xdf1501e72dc8e11a6abee5fd215850804cfbf9a512719dccf3c9017b32d166a2

* Terminal Tab #1 - Check Geth Console and it should display:

...
INFO [12-31|12:47:33] Submitted contract creation fullhash=0xABC contract=0xDEF...

* Terminal Tab #3 - Attached to the Geth Node JavaScript console. Verify that the Transaction Receipt does not exist for the Transaction Hash yet until mined (and returns `null`), then proceed to Mine some blocks before running `miner.stop()` to publish the contract on the blockchain: 

geth attach "/Users/Ls/code/blockchain/geth-node/chaindata/geth.ipc"

web3.eth.getTransactionReceipt('0xdf1501e72dc8e11a6abee5fd215850804cfbf9a512719dccf3c9017b32d166a2')

miner.start(1);

miner.stop()

* Terminal Tab #2 - Watch the Bash terminal for the PromiEvents that we setup an event listener for to trigger when the contract is mined and deployed in a block, when a receipt is provided, and for each confirmation (i.e. ~20 confirmations).
We also subscribe to different events that we added to the Solidity smart contract (i.e. `Created`)

  * EXAMPLE OUTPUT
    * `confirmation` events
    * `receipt` events
    * Deployment of contract Promise resolved success

Confirmation no. and receipt:  0 { blockHash: '0x388ff4acef35c2cdf18fba6551f359f4c25c3f7aa6ef2c4d87069683678de6b5',
  blockNumber: 126,
  contractAddress: '0xe1EE909fAE2341B12b3CAe9bE90ae47e9D9e1568',
  cumulativeGasUsed: 518521,
  from: '0x487f2778ec7d0747d6e26af80148ec471a08b339',
  gasUsed: 518521,
  logsBloom: '0x00000000000000000000000000008000000000000000000000000000000000021080000000000000000002000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000',
  root: '0xd70f83e1af93d9154a7d9cda888e9b11e11cc9942df5985a62dd25776ae2bee9',
  to: null,
  transactionHash: '0xdf1501e72dc8e11a6abee5fd215850804cfbf9a512719dccf3c9017b32d166a2',
  transactionIndex: 0,
  events: 
   { Created: 
      { address: '0xe1EE909fAE2341B12b3CAe9bE90ae47e9D9e1568',
        blockNumber: 126,
        transactionHash: '0xdf1501e72dc8e11a6abee5fd215850804cfbf9a512719dccf3c9017b32d166a2',
        transactionIndex: 0,
        blockHash: '0x388ff4acef35c2cdf18fba6551f359f4c25c3f7aa6ef2c4d87069683678de6b5',
        logIndex: 0,
        removed: false,
        id: 'log_cc8b5cba',
        returnValues: [Object],
        event: 'Created',
        signature: '0x102d25c49d33fcdb8976a3f2744e0785c98d9e43b88364859e6aec4ae82eff5c',
        raw: [Object] } } }
Receipt after mining with contract address: 0xe1EE909fAE2341B12b3CAe9bE90ae47e9D9e1568
Receipt after mining with events: [object Object]
Contract instance with address:  0xe1EE909fAE2341B12b3CAe9bE90ae47e9D9e1568
Contract instance created at block number: 126
Once event received event:  null
All events received event:  null

...

Confirmation no. and receipt:  10 { blockHash: '0x388ff4acef35c2cdf18fba6551f359f4c25c3f7aa6ef2c4d87069683678de6b5',
  blockNumber: 126,
  contractAddress: '0xe1EE909fAE2341B12b3CAe9bE90ae47e9D9e1568',
  cumulativeGasUsed: 518521,
  from: '0x487f2778ec7d0747d6e26af80148ec471a08b339',
  gasUsed: 518521,
  logsBloom: '0x00000000000000000000000000008000000000000000000000000000000000021080000000000000000002000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000',
  root: '0xd70f83e1af93d9154a7d9cda888e9b11e11cc9942df5985a62dd25776ae2bee9',
  to: null,
  transactionHash: '0xdf1501e72dc8e11a6abee5fd215850804cfbf9a512719dccf3c9017b32d166a2',
  transactionIndex: 0,
  events: 
   { Created: 
      { address: '0xe1EE909fAE2341B12b3CAe9bE90ae47e9D9e1568',
        blockNumber: 126,
        transactionHash: '0xdf1501e72dc8e11a6abee5fd215850804cfbf9a512719dccf3c9017b32d166a2',
        transactionIndex: 0,
        blockHash: '0x388ff4acef35c2cdf18fba6551f359f4c25c3f7aa6ef2c4d87069683678de6b5',
        logIndex: 0,
        removed: false,
        id: 'log_cc8b5cba',
        returnValues: [Object],
        event: 'Created',
        signature: '0x102d25c49d33fcdb8976a3f2744e0785c98d9e43b88364859e6aec4ae82eff5c',
        raw: [Object] } } }

* Check to see if a Transaction Receipt now exists for the Transaction Hash:

web3.eth.getTransactionReceipt('0xdf1501e72dc8e11a6abee5fd215850804cfbf9a512719dccf3c9017b32d166a2')

pyenv install 3.6.4rc1
pyenv versions
pyenv global 3.6.4rc1
python -m pip install py-solc==2.1.0
python -m solc.install v0.4.18
python -m pip install web3==4.0.0b5 
python -m pip install ethereum==2.1.5

python scripts/main.py

  • Experimental code snippets.

    • Install dependencies included for each file first
npm install ethers
npm install ethjs-query
npm install ethjs-account
npm install ethereumjs-tx
npm install ethjs-provider-signer
  • Run each experiment
node scripts/experiments/ethers-lib.js;
node scripts/experiments/ethjs-lib.js

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Deploy FixedSupplyToken to Private Network with Web3.js or Web3.py, Geth and Mist

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ethereum mist web3js solidity-contracts private-blockchain promise-all geth-node

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