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adeshshuklaadeshshukla
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‎Deploy.js

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Web3 = require("web3");
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solc = require('solc');
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fs = require("fs");
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// Block chain apirpc port
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//web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8081"));
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web3 = new Web3();
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var TestRPC = require("ethereumjs-testrpc");
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web3.setProvider(TestRPC.provider({unlocked_accounts:['0xfac3bc3201226bec30db2c9a68a8015e2ab8e267']}));
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// Read and Compile code
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//console.log('------------------ Code file read');
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code = fs.readFileSync('VotingContract.sol').toString();
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//console.log('------------------ Code compiling');
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compiledCode = solc.compile(code);
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// console.log(compiledCode);
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console.log('------------------ Abi Definition');
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abiDefinition = JSON.parse(compiledCode.contracts[':VotingContract'].interface)
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//var str = JSON.stringify(abiDefinition);
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console.log(abiDefinition);
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console.log('------------------ Reading Byte code ');
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byteCode = compiledCode.contracts[':VotingContract'].bytecode
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console.log('0x' + byteCode);
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//console.log('------------------ Creating contract ')
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VotingContract = web3.eth.contract(abiDefinition)
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//console.log('------------------ Voting contract created ')
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//console.log(VotingContract.options);
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web3.eth.getAccounts(function (error, result) {
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var defaultAcc = result[0];
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//console.log("------------------ DefaultAcc Address => ", defaultAcc);
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// console.log('------------------ Unlocking acc ')
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// web3.personal.unlockAccount(defaultAcc,'test12345'
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// , function(res){
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// console.log(res);
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// });
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var deployedContract = null;
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//console.log('------------------ Deploying contract ');
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VotingContract.new(['Rama','Nick','Jose'],{data: '0x' + byteCode, from: defaultAcc, gas: 4700000}
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, function(err, contract){
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// console.log(err);
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// console.log(contract);
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deployedContract = contract; // 0x326ddddfd73948c83f6e1d86bc5cdffe0f4c5f06
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console.log('------------------ Deployed contract address : ' + deployedContract.address);
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})
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});

‎FinalContract.js

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Web3 = require("web3");
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solc = require('solc');
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fs = require("fs");
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// Block chain apirpc port
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//web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8081"));
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web3 = new Web3();
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var TestRPC = require("ethereumjs-testrpc");
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web3.setProvider(TestRPC.provider({unlocked_accounts:['0xfac3bc3201226bec30db2c9a68a8015e2ab8e267']}));
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// Read and Compile code
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console.log('------------------ Code file read');
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code = fs.readFileSync('VotingContract.sol').toString();
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console.log('------------------ Code compiling');
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compiledCode = solc.compile(code);
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// console.log(compiledCode);
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console.log('------------------ Abi Definition');
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abiDefinition = JSON.parse(compiledCode.contracts[':VotingContract'].interface)
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// console.log('------------------ Abi : ');
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// var str = JSON.stringify(abiDefinition);
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// console.log(str);
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console.log('------------------ Reading Byte code ');
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byteCode = compiledCode.contracts[':VotingContract'].bytecode
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// console.log('0x' + byteCode);
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console.log('------------------ Creating contract ')
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VotingContract = web3.eth.contract(abiDefinition)
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console.log('------------------ Voting contract created ')
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//console.log(VotingContract.options);
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web3.eth.getAccounts(function (error, result) {
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var defaultAcc = result[0];
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console.log("------------------ DefaultAcc Address ")
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console.log(defaultAcc);
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// console.log('------------------ Unlocking acc ')
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// web3.personal.unlockAccount(defaultAcc,'test12345'
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// , function(res){
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// console.log(res);
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// });
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var deployedContract = null;
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console.log('------------------ Deploying contract ');
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VotingContract.new(['Rama','Nick','Jose'],{data: '0x' + byteCode, from: defaultAcc, gas: 4700000}
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, function(err, contract){
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// console.log(err);
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// console.log(contract);
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deployedContract = contract; // 0x326ddddfd73948c83f6e1d86bc5cdffe0f4c5f06
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console.log('------------------ Deployed contract address : ' + deployedContract.address);
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console.log('------------------ ContractInstance --------------------')
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contractInstance = VotingContract.at(deployedContract.address);
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//console.log(contractInstance);
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contractInstance.totalVotesFor('Rama', function(err,result){
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console.log('------------------ Total Votes for Rama --------------------')
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if(err){
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console.log('!!!...Error...!!!');
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console.log(err);
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}
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else{
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console.log("Total Votes => ", result.toString());
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}
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}) ;
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contractInstance.voteForCandidate('Rama', {from: defaultAcc}, function(err,result){
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console.log('------------------ Voting for Rama 1 --------------------')
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if(err){
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console.log('!!!...Error...!!!');
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console.log(err);
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}
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else{
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console.log("Tx => ", result);
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}
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}) ;
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contractInstance.voteForCandidate('Rama', {from: defaultAcc}, function(err,result){
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console.log('------------------ Voting for Rama 2 --------------------')
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if(err){
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console.log('!!!...Error...!!!');
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console.log(err);
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}
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else{
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console.log("Tx => ", result);
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}
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}) ;
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contractInstance.totalVotesFor('Rama', function(err,result){
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console.log('------------------ After voting for Rama --------------------')
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if(err){
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console.log('!!!...Error...!!!');
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console.log(err);
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}
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else{
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console.log("Total Votes => ", result.toString());
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}
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}) ;
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})
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});

‎Interact.js

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Web3 = require("web3");
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solc = require('solc');
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fs = require("fs");
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// Block chain apirpc port
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//web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8081"));
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web3 = new Web3();
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var TestRPC = require("ethereumjs-testrpc");
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web3.setProvider(TestRPC.provider());
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var abiDefinition = JSON.parse('[{"constant":true,"inputs":[{"name":"candidate","type":"bytes32"}],"name":"totalVotesFor","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"candidate","type":"bytes32"}],"name":"validCandidate","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"votesReceived","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"candidateList","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"candidate","type":"bytes32"}],"name":"voteForCandidate","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getCandidateList","outputs":[{"name":"","type":"bytes32[]"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[{"name":"candidateNames","type":"bytes32[]"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"}]');
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var address = "0x69522edac428aa6a369d60e42d374da5575cb911";
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console.log('------------------ Creating Contract ');
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VotingContract = web3.eth.contract(abiDefinition);
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console.log('------------------ Contract Instance ');
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contractInstance = VotingContract.at(address);
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// console.log(contractInstance);
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web3.eth.getAccounts(function (error, result) {
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var defaultAcc = result[0];
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console.log("------------------ DefaultAcc Address => ", defaultAcc);
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// console.log('------------------ Unlocking acc ')
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// web3.personal.unlockAccount(defaultAcc,'test12345'
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// , function(res){
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// console.log(res);
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// });
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contractInstance.totalVotesFor('Rama', function(err,result){
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console.log('------------------ Total Votes for Rama --------------------')
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if(err){
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console.log('!!!...Error...!!!');
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console.log(err);
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}
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else{
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console.log("Total Votes => ", result.toString());
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}
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}) ;
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contractInstance.voteForCandidate('Rama', {from: defaultAcc}, function(err,result){
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console.log('------------------ Voting for Rama 1 --------------------')
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if(err){
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console.log('!!!...Error...!!!');
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console.log(err);
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}
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else{
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console.log("Tx => ", result);
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}
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}) ;
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contractInstance.voteForCandidate('Rama', {from: defaultAcc}, function(err,result){
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console.log('------------------ Voting for Rama 2 --------------------')
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if(err){
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console.log('!!!...Error...!!!');
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console.log(err);
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}
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else{
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console.log("Tx => ", result);
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}
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}) ;
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contractInstance.totalVotesFor('Rama', function(err,result){
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console.log('------------------ After voting for Rama --------------------')
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if(err){
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console.log('!!!...Error...!!!');
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console.log(err);
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}
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else{
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console.log("Total Votes => ", result.toString());
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}
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}) ;
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});

‎VotingContract.sol

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pragma solidity ^0.4.18;
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contract VotingContract {
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/* mapping field below is equivalent to an associative array or hash.
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The key of the mapping is candidate name stored as type bytes32 and value is
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an unsigned integer to store the vote count
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*/
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mapping (bytes32 => uint8) public votesReceived;
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/* Solidity doesn't let you pass in an array of strings in the constructor (yet).
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We will use an array of bytes32 instead to store the list of candidates
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*/
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bytes32[] public candidateList;
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/* This is the constructor which will be called once when you
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deploy the contract to the blockchain. When we deploy the contract,
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we will pass an array of candidates who will be contesting in the election
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*/
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function VotingContract(bytes32[] candidateNames) public {
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candidateList = candidateNames;
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}
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// This function returns the total votes a candidate has received so far
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function totalVotesFor(bytes32 candidate) public view returns (uint8) {
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require(validCandidate(candidate));
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return votesReceived[candidate];
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}
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// This function increments the vote count for the specified candidate. This
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// is equivalent to casting a vote
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function voteForCandidate(bytes32 candidate) public {
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require(validCandidate(candidate));
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votesReceived[candidate] += 1;
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}
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function getCandidateList() public view returns(bytes32[]) {
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return candidateList;
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}
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function validCandidate(bytes32 candidate) public view returns (bool) {
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for (uint i = 0; i < candidateList.length; i++) {
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if (candidateList[i] == candidate) {
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return true;
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}
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}
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return false;
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}
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}

‎contractInfo.js

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‎package.json

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{
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"name": "nodeexpressapp1",
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"version": "1.0.0",
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"description": "",
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"main": "server.js",
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"scripts": {
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"test": "echo \"Error: no test specified\" && exit 1",
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"start": "node server.js"
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},
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"author": "",
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"license": "ISC",
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"dependencies": {
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"body-parser": "^1.17.2",
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"ethereumjs-testrpc": "^6.0.3",
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"express": "^4.15.3",
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"solc": "^0.4.19",
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"web3": "^0.20.1"
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}
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}

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