After cloning the demo repository, please follow the steps below to setup the ethereum dev environment.
The below instructions are for MAC users
To start with, you will need to install some tools:
- Node JS Latest Current v8.8.1 (https://nodejs.org/en/download/)
- Editor (Sublime Text, Atom or Visual Studio Code)
- Download Ethereum-Solidity package/plugin for the chosen editor :
- Ethereum package for Sublime Text
- atom-solidity-linter for Atom
- solidity for VS Code
npm install -g --production windows-build-tools
Note: cygwin terminal is recommended command line tool for windows. Truffle has issues when used through command prompt.
Now to install testrpc & web3, run the below command:
npm install -g ethereumjs-testrpc
Install truffle
npm install -g truffle
Now to install the repository specific dependencies. Change the directory in your terminal to the cloned repo:
npm install
That's it. Now you are all set to start blockchaining!!!
Start testrpc
Below command would start testrpc on localhost:8545 with 20 accounts.
testrpc -a 20
To compile the contract
truffle compile
To deploy the contract
truffle deploy (Save the address at which the contract is deployed for future use). Below is the highlighted text of address on terminal:
Using network 'development'.
Running migration: 1_initial_migration.js
Deploying Migrations...
... 0xb8835c7b4b7f9274ad8d2e08605dc0a21b5815d42b101087f99efef19deef317
Migrations: 0x533675db9fbaf0e1438bb787946f3fd3e44aab88
Saving successful migration to network...
... 0x5ff5defa179f3033dce3515fa3e6cd26942171d724510091d7d721080e3c1195
Saving artifacts...
Running migration: 2_helloEthereum_migration.js
Deploying HelloEthereum...
... 0x14b509d7e4353edfc77460c887ca210da47036c7237cd72ec0576de248cd364b
HelloEthereum: 0xabfb01a7dd39cfeaa733061e5823d0beee7ed287
---------------------------------------------------------
Saving successful migration to network...
... 0x761b17755241169ad99cce5730480e854b948cb363c1a981396ab5c77d914f74
Saving artifacts...
Interactive node console
At the terminal type node, this will start the interactive node console. Now we initialize web3 object.
> Web3 = require('web3')
Ouput:
{ [Function: Web3]
providers:
{ HttpProvider: [Function: HttpProvider],
IpcProvider: [Function: IpcProvider] } }
> web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
To test the initialization
> web3.eth.accounts
Ouput:
[ '0xfbe5ae36d2108833a53b5211d3feea7131708611',
'0x1f22caee8af53c86079f9038801db12db6ab4afc',
'0x6e83e231ccd7bd42b27ecda94e82375ab9ab5db5',
'0x380a47c02ecdf4173d6817a2c544ee3351020ba9',
'0xe3b90832a4d618708bd8ac116e14fe07d8b57f45',
'0xc4afe320dde07e84be25bc621ce192a1b7dc186b',
'0x10d5de17d2ba64ff2816c30600a953c253acad2e',
'0x494cefa9d1a8a6a194567e4f167c409e4734f917',
'0xc315865bc76b37cc0f1b99876412464e4b32087b',
'0x43fcaa087e796dc31f692023d30ece05d7f3cbc4',
'0x724db495e3002b41c4ed16fe867bb593e8c3b77c',
'0x70d56dbd33fbb049346f4d3951e7d2ff80a11b87',
'0xc5ee5ed46c47f0ed887331cacb59f950d59900d8',
'0x1b890ffc94bf4badf05c500f856620d7bb54afe8',
'0xb8e597924ceb748046186154d3b6aa7a4619da51',
'0x6482007817e96d3d36d37f65180993ed1f7374e0',
'0x2267be4362a358c1467f0c5a5fe4d07ce9007152',
'0x1ba07828f8d9c3f36ed221416e44058105c32af4',
'0x2b8fb3e92700929b5ac6bec7fae21d321f110f0d',
'0x884dae28a3ed5f9ca716d1ee3549084bc1732937' ]
**To test the contract, now we need abi(descriptions of functions and events of the contract) and contract deployed address
If you check the build folder in the repo, you have a contracts folder under which you have the compiled json file for the HelloEthereum contract. In the json file, you should a key that says "abi". Copy the whole abi array value. Go to the terminal and assign it to a variable.
> var abi = <copied abi array>
> var contract = web3.eth.contract(abi)
> var contractInstance = contract.at("0x5f35c0fe291735c0d92e2515929fece8ac43e668") -> Deployed address
Start experimenting with methods in contract
> contractInstance.getCreationTime().toLocaleString()
Ouput:
'1509376829'
> contractInstance.isPersonRegistered(web3.eth.accounts[1])
Output:
false
> contractInstance.register('User1', web3.eth.accounts[1], 1234, 0, 23, {from: web3.eth.accounts[0], gas: 145000})
Output:
'0x3f108301f136d5adb841f5e27cd81e1e10ef531f9da7450ae44787ca957a6f20'
> contractInstance.isPersonRegistered(web3.eth.accounts[1])
Output:
true
> contractInstance.sayHi({from: web3.eth.accounts[1]})
Output:
'0x7d6b7e7879f10be53cacbace5722176628ade7ba2c8f4677f0b2131f50ce6fcf'
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