TimeStamping App
- tsapp
- sqlite
Use the node package manager npm to install dependencies.
npm install
Python must be installed in the machine. Once Python is installed run
pip install merkletools
# NOTE: Without Python, Ts APP won't work.Setting Up GETH and METAMASK
## METAMASK SETTING UP
1. Follow the Tutorial on Medium
https://medium.com/coinmonks/a-really-simple-smart-contract-on-how-to-insert-value-into-the-ethereum-blockchain-and-display-it-62c455610e98
2. Using Metamask we just buy and set the account ether i.e 1 Ether to the account.
3. Using Metamask we deploy a contract on Ethereum.
4. All of this steps are explained on the tutorial.
## GETH SETTING UP
1. For Installing GETH on Linux Enviroment.
https://geth.ethereum.org/docs/install-and-build/installing-geth
2. Run GETH in Background
COMMAND:
screen -d -m geth --testnet --rpc --syncmode light --ws --wsorigins testnode1 --unlock <METAMASK_ACCOUNT_ID> --password <PASSWORD_FILE_PATH> --allow-insecure-unlock
Example:
screen -d -m geth --testnet --rpc --syncmode light --ws --wsorigins testnode1 --unlock 0x210B0d1c071CE9E59f408972dBcC4C98D9945381 --password ./password --allow-insecure-unlock
2.1 Not that the password file should be located on the directory.
2.2 Password Files, must have an next line, meaning a blank next line, which simulates the enter key.
3. HTTP Command Line for GETH:
geth attach http://127.0.0.1:8545
4. Command Line for GETH Accounts
geth --testnet account list
5. Importing a Metamsk Testnet Ethereum Wallet to GETH
geth --testnet account import private_key
5.1 Import the Metamask Account to GETH.
5.2 Private Key of Metamask in found in the METAMASK Account Details.
The following assumes that
- MetaMask Account has been created, and has enough ethers for transactions.
- Contract has been compiled and deployed on https://remix.ethereum.org/
- GETH is configured and running.
- GETH HTTP IP and PORT are reachable.
Use the package manager https://www.npmjs.com/package/web3 to install Web3 dependencies.
npm install web3 --saveChange the below code segment values only according to configuration.
Start updating the file, for updating the code to new configuration.
var web3 = new Web3(<GETH_HTTP_IP:GETH_HTTP_PORT>);
// Mostly GETH has HTTP running on <IP>:<PORT>
// http://localhost:8545 on local machine
// http://<MACHINE_IP>:8545 on network
const abi=<CONTRACT_ABI_ARRAY>;
// Copy the Contract ABI from remix.ethereum, where the contract
// was compiled and deployed.
const contract_Address=<CONTRACT_ADDDRESS>;
// Copy the Contract Address from remix.ethereum, where the contract
// was compiled and deployed.
const fromAddress = <FROM_ADDRESS>;
// Copy the From Address from Metamask.
After updating the following code segments according to configuration jump to
router.post('/addtoblockchain') API Endpoint
// This API commits to Ropsten Ethereum End Point
// Currently the code is as below
contract.methods.set(req.body["hash_obj"]).send({from: fromAddress})
.on('transactionHash', function(hash){
console.log(hash);
})
.on('receipt', function(receipt){
console.log(receipt);
})
.on('confirmation', function(confirmationNumber, receipt){
console.log(confirmationNumber, receipt);
res.send(receipt);
})
.on('error', console.error);
// To update the contract to call
// a new function with predefined
// number of arguments, update the line,
contract.methods.set(req.body["hash_obj"])
// The first two objects i.e. contract.methods
// are standard Web3 methods, so no updates should be made.
// The third object i.e. set(req.body["hash_obj"])
// is the name of the function and arguments on the contract
// deployed on remix.ethereum.
// If there is any change in the name of the function or argument
// please update the lines as required.
// FORMAT:
// contract.methods.<FUNCTION_NAME>(<FUNCTION_ARGUMENTS>)
// Post that, the '.on' events can be played around.
After updating make sure to restart the complete Express Application to reflect the changes.
- tsapp
#Follow the below commands for setting up arena
npm install
cd tsapp/
npm install
npm start
#Applicaton will run in,
http://<IP>:3070/tsapp
Default Credentials:
Username: <admin@tsapp.com>
Password: <abc123>-
Ts App uses a Bootstrap, hence it can downloaded as per user requirements or can be used over any CDN network.
-
Ts App runs on Ropsten Ethereum TestNet, so a Local Testnet node must be avaliable, on http port 8545.