第十一课 从宠物商店案例看DAPP架构和WEB3.JS交互接口

App = {
  web3Provider: null,
  contracts: {},

  init: function() {
    /*加载宠物名字，图片，年龄，位置等信息*/
    // Load pets.
    $.getJSON('../pets.json', function(data) {
      var petsRow = $('#petsRow');
      var petTemplate = $('#petTemplate');

      for (i = 0; i < data.length; i ++) {
        petTemplate.find('.panel-title').text(data[i].name);
        petTemplate.find('img').attr('src', data[i].picture);
        petTemplate.find('.pet-breed').text(data[i].breed);
        petTemplate.find('.pet-age').text(data[i].age);
        petTemplate.find('.pet-location').text(data[i].location);
        petTemplate.find('.btn-adopt').attr('data-id', data[i].id);

        petsRow.append(petTemplate.html());
      }
    });

    return App.initWeb3();
  },

  initWeb3: function() {
    /*如果web3事先被定义，则使用当前web3实例的钱包对象。例如remix下JavaScript VM创建的虚拟钱包（有4个含100个 ETH的账户）；
      或者MetaMask链接后的账户钱包；或者mist钱包*/
    if (typeof web3 !== 'undefined') {
      App.web3Provider = web3.currentProvider;
    } else {
      // If no injected web3 instance is detected, fall back to Ganache
      /*如果web3不存在，则启动本地启动的Ganache钱包。[前提：要启动好本地的Ganache环境哦，否则会创建不成功]*/
      App.web3Provider = new Web3.providers.HttpProvider('http://localhost:7545');
    }
    /*创建Web3实例，入口参数为刚才配置的App.web3Provider*/
    web3 = new Web3(App.web3Provider);

    /*调用初始化合约函数*/
    return App.initContract();
  },

  initContract: function() {
    /*参考 http://www.w3school.com.cn/jquery/ajax_getjson.asp 获取getJSON到的方法*/
    $.getJSON('Adoption.json', function(data) {
      // Get the necessary contract artifact file and instantiate it with truffle-contract
      var AdoptionArtifact = data;
      App.contracts.Adoption = TruffleContract(AdoptionArtifact);
    
      // 设置当前合约的web3Provider钱包提供者
      App.contracts.Adoption.setProvider(App.web3Provider);
    
      // 使用我们的合约去提取和标识已领养的宠物
      return App.markAdopted();
    });

        /*返回绑定事件*/
    return App.bindEvents();
  },

  /*点击含有'.btn-adopt'类的click事件会触发handleAdopt(处理领养)的函数*/
  bindEvents: function() {
    $(document).on('click', '.btn-adopt', App.handleAdopt);
  },

 /*如果该宠物已被领养，则文字显示为"Success"，按钮不可点击*/
  markAdopted: function(adopters, account) {
    var adoptionInstance;

    App.contracts.Adoption.deployed().then(function(instance) {
      adoptionInstance = instance;
    
      return adoptionInstance.getAdopters.call();
    }).then(function(adopters) {
      for (i = 0; i < adopters.length; i++) {
        /*如果领养者的地址不是为0，则设置按钮字体和状态，*/
        if (adopters[i] !== '0x0000000000000000000000000000000000000000') {
          $('.panel-pet').eq(i).find('button').text('Success').attr('disabled', true);
        }
      }
    }).catch(function(err) {
      console.log(err.message);
    });
  },

  handleAdopt: function(event) {
    event.preventDefault();
    
    /*parseInt() 函数可解析一个字符串，并返回一个整数。*/
    var petId = parseInt($(event.target).data('id'));

    var adoptionInstance;
    
    /*获取当前ETH钱包的账号*/
    web3.eth.getAccounts(function(error, accounts) {
      if (error) {
        console.log(error);
      }
    
     /*取第一个钱包账号*/
      var account = accounts[0];
    
     /*ES6的then函数调用，链式调用*/
      App.contracts.Adoption.deployed().then(function(instance) {
        adoptionInstance = instance;

        // 通过发送账户执行adopt领养函数的交易的返回值
        // 此处没有搞懂，智能合约Adoption.adopt只有一个入参，此处为什么增加了第二个{from: account}参数呢？
        //TINY熊认为，把它当做语法就可以， 要么提前设置默认账号， 要么调用时指定
        return adoptionInstance.adopt(petId, {from: account});
      }).then(function(result) {
        /*标识领养状态*/
        return App.markAdopted();
        /*输出错误*/
      }).catch(function(err) {
        console.log(err.message);
      });
    });
  }

};

/*窗口加载即调用App.init函数*/
$(function() {
  $(window).load(function() {
    App.init();
  });
});

//初始化过程
var Web3 = require('web3');

if (typeof web3 !== 'undefined') {
  web3 = new Web3(web3.currentProvider);
} else {
  // set the provider you want from Web3.providers
  web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
}

//省略初始化过程
var version = web3.version.api;
console.log(version);

$ node test.js
0.18.2

//省略初始化过程
var version = web3.version.node;
console.log(version);

$ node test.js
EthereumJS TestRPC/v3.0.3/ethereum-js

//省略初始化过程
var version = web3.version.network;
console.log(version);

$ node test.js
1488546587563

//省略初始化过程
var version = web3.version.ethereum;
console.log(version);

$ node test.js
60

//省略初始化过程
var version = web3.version.whisper;
console.log(version);

$ node test.js
20

//省略初始化过程
var connected = web3.isConnected();
if(!connected){
  console.log("node not connected!");
}else{
  console.log("node connected");
}

web3.setProvider(new web3.providers.HttpProvider('http://localhost:8545'));

if(!web3.currentProvider)
    web3.setProvider(new web3.providers.HttpProvider("http://localhost:8545"));

//省略初始化过程
console.log("reseting ... ");
web3.reset();
console.log("is connected:" + web3.isConnected());

$ node test.js
reseting ...
is connected:true

//省略初始化过程
var hash = web3.sha3("Some string to be hashed");
console.log(hash); 
var hashOfHash = web3.sha3(hash, {encoding: 'hex'});
console.log(hashOfHash); 

//初始化基本对象
var Web3 = require('web3');
var web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
var BigNumber = require('bignumber.js');

var str = "abcABC";
var obj = {abc: 'ABC'};
var bignumber = new BigNumber('12345678901234567890');

var hstr = web3.toHex(str);
var hobj = web3.toHex(obj);
var hbg = web3.toHex(bignumber);

console.log("Hex of Sring:" + hstr);
console.log("Hex of Object:" + hobj);
console.log("Hex of BigNumber:" + hbg);

$ node test.js
Hex of Sring:0x616263414243
Hex of Object:0x7b22616263223a22414243227d
Hex of BigNumber:0xab54a98ceb1f0ad2

var str = web3.toAscii("0x657468657265756d000000000000000000000000000000000000000000000000");
console.log(str); // "ethereum"

var str = web3.fromAscii('ethereum');
console.log(str); // "0x657468657265756d"

var str2 = web3.fromAscii('ethereum', 32);
console.log(str2); // "0x657468657265756d000000000000000000000000000000000000000000000000"

$ node test.js
0x657468657265756d
0x657468657265756d

var number = web3.toDecimal('0x15');
console.log(number); // 21

var value = web3.fromDecimal('21');
console.log(value); // "0x15"

var value = web3.fromWei('21000000000000', 'finney');
console.log(value); // "0.021"

var value = web3.toWei('1', 'ether');
console.log(value); // "1000000000000000000"

var value = web3.toBigNumber('200000000000000000000001');
console.log(value); // instanceOf BigNumber
console.log(value.toNumber()); // 2.0000000000000002e+23
console.log(value.toString(10)); // '200000000000000000000001'

var listening = web3.net.listening;
console.log("client listening: " + listening);

$ node test.js
client listening: true

var peerCount = web3.net.peerCount;
console.log("Peer count: " + peerCount); 

$ node test.js
Peer count: 0

var eth = web3.eth;

console.log("Current default: " + web3.eth.defaultAccount);
web3.eth.defaultAccount = '0x8888f1f195afa192cfee860698584c030f4c9db1';
console.log("Current default: " + web3.eth.defaultAccount);

$ node test.js
Current default: undefined
Current default: 0x8888f1f195afa192cfee860698584c030f4c9db1

console.log("defaultBlock: " + web3.eth.defaultBlock);
web3.eth.defaultBlock = 231;
console.log("defaultBlock: " + web3.eth.defaultBlock);

$ node test.js
defaultBlock: latest
defaultBlock: 231

var sync = web3.eth.syncing;
console.log(sync);

$ node test.js
false
//正在sync的情况
$ node test.js
{
   startingBlock: 300,
   currentBlock: 312,
   highestBlock: 512
}

//初始化基本对象
var Web3 = require('web3');
var web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
var BigNumber = require('bignumber.js');

web3.eth.isSyncing(function(error, sync){
    if(!error) {
        // stop all app activity
        if(sync === true) {
           // we use `true`, so it stops all filters, but not the web3.eth.syncing polling
           web3.reset(true);

        // show sync info
        } else if(sync) {
           console.log(sync.currentBlock);

        // re-gain app operation
        } else {
            // run your app init function...
        }
    }
});

var coinbase = web3.eth.coinbase;
console.log(coinbase); // "0x407d73d8a49eeb85d32cf465507dd71d507100c1"

var mining = web3.eth.mining;
console.log(mining); // true or false

var hashrate = web3.eth.hashrate;
console.log(hashrate);

var gasPrice = web3.eth.gasPrice;
console.log(gasPrice.toString(10)); // "10000000000000"

var accounts = web3.eth.accounts;
console.log(accounts); 

var number = web3.eth.blockNumber;
console.log(number); // 2744

web3.eth.register("0x407d73d8a49eeb85d32cf465507dd71d507100ca")

web3.eth.unRegister("0x407d73d8a49eeb85d32cf465507dd71d507100ca")

var balance = web3.eth.getBalance("0x407d73d8a49eeb85d32cf465507dd71d507100c1");
console.log(balance); // instanceof BigNumber
console.log(balance.toString(10)); // '1000000000000'
console.log(balance.toNumber()); // 1000000000000

var state = web3.eth.getStorageAt("0x407d73d8a49eeb85d32cf465507dd71d507100c1", 0);
console.log(state); // "0x03"

var code = web3.eth.getCode("0xd5677cf67b5aa051bb40496e68ad359eb97cfbf8");
console.log(code); // "0x600160008035811a818181146012578301005b601b6001356025565b8060005260206000f25b600060078202905091905056"

var info = web3.eth.getBlock(3150);
console.log(info);
/*
{
  "number": 3,
  "hash": "0xef95f2f1ed3ca60b048b4bf67cde2195961e0bba6f70bcbea9a2c4e133e34b46",
  "parentHash": "0x2302e1c0b972d00932deb5dab9eb2982f570597d9d42504c05d9c2147eaf9c88",
  "nonce": "0xfb6e1a62d119228b",
  "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
  "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
  "transactionsRoot": "0x3a1b03875115b79539e5bd33fb00d8f7b7cd61929d5a3c574f507b8acf415bee",
  "stateRoot": "0xf1133199d44695dfa8fd1bcfe424d82854b5cebef75bddd7e40ea94cda515bcb",
  "miner": "0x8888f1f195afa192cfee860698584c030f4c9db1",
  "difficulty": BigNumber,
  "totalDifficulty": BigNumber,
  "size": 616,
  "extraData": "0x",
  "gasLimit": 3141592,
  "gasUsed": 21662,
  "timestamp": 1429287689,
  "transactions": [
    "0x9fc76417374aa880d4449a1f7f31ec597f00b1f6f3dd2d66f4c9c6c445836d8b"
  ],
  "uncles": []
}
*/

var number = web3.eth.getBlockTransactionCount("0x407d73d8a49eeb85d32cf465507dd71d507100c1");
console.log(number); // 1

var uncle = web3.eth.getUncle(500, 0);
console.log(uncle); // see web3.eth.getBlock

var blockNumber = 668;
var indexOfTransaction = 0

var transaction = web3.eth.getTransaction(blockNumber, indexOfTransaction);
console.log(transaction);
/*
{
  "hash": "0x9fc76417374aa880d4449a1f7f31ec597f00b1f6f3dd2d66f4c9c6c445836d8b",
  "nonce": 2,
  "blockHash": "0xef95f2f1ed3ca60b048b4bf67cde2195961e0bba6f70bcbea9a2c4e133e34b46",
  "blockNumber": 3,
  "transactionIndex": 0,
  "from": "0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b",
  "to": "0x6295ee1b4f6dd65047762f924ecd367c17eabf8f",
  "value": BigNumber,
  "gas": 314159,
  "gasPrice": BigNumber,
  "input": "0x57cb2fc4"
}
*/

getTransactionFromBlock(hashStringOrNumber, indexNumber [, callback])

var transaction = web3.eth.getTransactionFromBlock('0x4534534534', 2);
console.log(transaction); // see web3.eth.getTransaction

var receipt = web3.eth.getTransactionReceipt('0x9fc76417374aa880d4449a1f7f31ec597f00b1f6f3dd2d66f4c9c6c445836d8b');
console.log(receipt);
{
  "transactionHash": "0x9fc76417374aa880d4449a1f7f31ec597f00b1f6f3dd2d66f4c9c6c445836d8b",
  "transactionIndex": 0,
  "blockHash": "0xef95f2f1ed3ca60b048b4bf67cde2195961e0bba6f70bcbea9a2c4e133e34b46",
  "blockNumber": 3,
  "contractAddress": "0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b",
  "cumulativeGasUsed": 314159,
  "gasUsed": 30234,
  "logs": [{
         // logs as returned by getFilterLogs, etc.
     }, ...]
}

var number = web3.eth.getTransactionCount("0x407d73d8a49eeb85d32cf465507dd71d507100c1");
console.log(number); // 1

// compiled solidity source code using https://chriseth.github.io/cpp-ethereum/
var code = "603d80600c6000396000f3007c01000000000000000000000000000000000000000000000000000000006000350463c6888fa18114602d57005b6007600435028060005260206000f3";

web3.eth.sendTransaction({data: code}, function(err, address) {
  if (!err)
    console.log(address); // "0x7f9fade1c0d57a7af66ab4ead7c2eb7b11a91385"
});

var Tx = require('ethereumjs-tx');
var privateKey = new Buffer('e331b6d69882b4cb4ea581d88e0b604039a3de5967688d3dcffdd2270c0fd109', 'hex')

var rawTx = {
  nonce: '0x00',
  gasPrice: '0x09184e72a000', 
  gasLimit: '0x2710',
  to: '0x0000000000000000000000000000000000000000', 
  value: '0x00', 
  data: '0x7f7465737432000000000000000000000000000000000000000000000000000000600057'
}

var tx = new Tx(rawTx);
tx.sign(privateKey);

var serializedTx = tx.serialize();

//console.log(serializedTx.toString('hex'));
//0xf889808609184e72a00082271094000000000000000000000000000000000000000080a47f74657374320000000000000000000000000000000000000000000000000000006000571ca08a8bbf888cfa37bbf0bb965423625641fc956967b81d12e23709cead01446075a01ce999b56a8a88504be365442ea61239198e23d1fce7d00fcfc5cd3b44b7215f

web3.eth.sendRawTransaction(serializedTx.toString('hex'), function(err, hash) {
  if (!err)
    console.log(hash); // "0x7f9fade1c0d57a7af66ab4ead79fade1c0d57a7af66ab4ead7c2c2eb7b11a91385"
});

r = signature[0:64]
s = signature[64:128]
v = signature[128:130]

var result = web3.eth.sign("0x135a7de83802408321b74c322f8558db1679ac20",
    "0x9dd2c369a187b4e6b9c402f030e50743e619301ea62aa4c0737d4ef7e10a3d49"); // second argument is web3.sha3("xyz")
console.log(result); // "0x30755ed65396facf86c53e6217c52b4daebe72aa4941d89635409de4c9c7f9466d4e9aaec7977f05e923889b33c0d0dd27d7226b6e6f56ce737465c5cfd04be400"

var Web3 = require('web3');

if (typeof web3 !== 'undefined') {
  web3 = new Web3(web3.currentProvider);
} else {
  // set the provider you want from Web3.providers
  web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
}

var from = web3.eth.accounts[0];
//部署合约的发布地址
/*合约内容如下
pragma solidity ^0.4.0;

contract Calc{
  function add(uint a, uint b) returns (uint){
    return a + b;
  }
}
*/
var to = "0xa4b813d788218df688d167102e5daff9b524a8bc";

//要发送的数据
//格式说明见： http://me.tryblockchain.org/Solidity-call-callcode-delegatecall.html
var data = "0x771602f700000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002";

var result = web3.eth.call({
  from : from,
  to : to,
  data : data
});

//返回结果32字长的结果3
console.log(result);

var result = web3.eth.estimateGas({
    to: "0xc4abd0339eb8d57087278718986382264244252f", 
    data: "0xc6888fa10000000000000000000000000000000000000000000000000000000000000003"
});
console.log(result); // "0x0000000000000000000000000000000000000000000000000000000000000015"

var filter = web3.eth.filter('pending');

filter.watch(function (error, log) {
  console.log(log); //  {"address":"0x0000000000000000000000000000000000000000", "data":"0x0000000000000000000000000000000000000000000000000000000000000000", ...}
});

// get all past logs again.
var myResults = filter.get(function(error, logs){ ... });

...

// stops and uninstalls the filter
filter.stopWatching();

var MyContract = web3.eth.contract(abiArray);

// instantiate by address
var contractInstance = MyContract.at([address]);

// deploy new contract
var contractInstance = MyContract.new([contructorParam1] [, contructorParam2], {data: '0x12345...', from: myAccount, gas: 1000000});

// Get the data to deploy the contract manually
var contractData = MyContract.new.getData([contructorParam1] [, contructorParam2], {data: '0x12345...'});
// contractData = '0x12345643213456000000000023434234'

// Instantiate from an existing address:
var myContractInstance = MyContract.at(myContractAddress);

// Or deploy a new contract:

// Deploy the contract asyncronous from Solidity file:
...
const fs = require("fs");
const solc = require('solc')

let source = fs.readFileSync('nameContract.sol', 'utf8');
let compiledContract = solc.compile(source, 1);
let abi = compiledContract.contracts['nameContract'].interface;
let bytecode = compiledContract.contracts['nameContract'].bytecode;
let gasEstimate = web3.eth.estimateGas({data: bytecode});
let MyContract = web3.eth.contract(JSON.parse(abi));

var myContractReturned = MyContract.new(param1, param2, {
   from:mySenderAddress,
   data:bytecode,
   gas:gasEstimate}, function(err, myContract){
    if(!err) {
       // NOTE: The callback will fire twice!
       // Once the contract has the transactionHash property set and once its deployed on an address.

       // e.g. check tx hash on the first call (transaction send)
       if(!myContract.address) {
           console.log(myContract.transactionHash) // The hash of the transaction, which deploys the contract

       // check address on the second call (contract deployed)
       } else {
           console.log(myContract.address) // the contract address
       }

       // Note that the returned "myContractReturned" === "myContract",
       // so the returned "myContractReturned" object will also get the address set.
    }
  });

// Deploy contract syncronous: The address will be added as soon as the contract is mined.
// Additionally you can watch the transaction by using the "transactionHash" property
var myContractInstance = MyContract.new(param1, param2, {data: myContractCode, gas: 300000, from: mySenderAddress});
myContractInstance.transactionHash // The hash of the transaction, which created the contract
myContractInstance.address // undefined at start, but will be auto-filled later

// contract abi
var abi = [{
     name: 'myConstantMethod',
     type: 'function',
     constant: true,
     inputs: [{ name: 'a', type: 'string' }],
     outputs: [{name: 'd', type: 'string' }]
}, {
     name: 'myStateChangingMethod',
     type: 'function',
     constant: false,
     inputs: [{ name: 'a', type: 'string' }, { name: 'b', type: 'int' }],
     outputs: []
}, {
     name: 'myEvent',
     type: 'event',
     inputs: [{name: 'a', type: 'int', indexed: true},{name: 'b', type: 'bool', indexed: false}]
}];

// creation of contract object
var MyContract = web3.eth.contract(abi);

// initiate contract for an address
var myContractInstance = MyContract.at('0xc4abd0339eb8d57087278718986382264244252f');

// call constant function
var result = myContractInstance.myConstantMethod('myParam');
console.log(result) // '0x25434534534'

// send a transaction to a function
myContractInstance.myStateChangingMethod('someParam1', 23, {value: 200, gas: 2000});

// short hand style
web3.eth.contract(abi).at(address).myAwesomeMethod(...);

// create filter
var filter = myContractInstance.myEvent({a: 5}, function (error, result) {
  if (!error)
    console.log(result);
    /*
    {
        address: '0x8718986382264244252fc4abd0339eb8d5708727',
        topics: "0x12345678901234567890123456789012", "0x0000000000000000000000000000000000000000000000000000000000000005",
        data: "0x0000000000000000000000000000000000000000000000000000000000000001",
        ...
    }
    */
});

// Automatically determines the use of call or sendTransaction based on the method type
myContractInstance.myMethod(param1 [, param2, ...] [, transactionObject] [, defaultBlock] [, callback]);

// Explicitly calling this method
myContractInstance.myMethod.call(param1 [, param2, ...] [, transactionObject] [, defaultBlock] [, callback]);

// Explicitly sending a transaction to this method
myContractInstance.myMethod.sendTransaction(param1 [, param2, ...] [, transactionObject] [, callback]);

// Get the call data, so you can call the contract through some other means
var myCallData = myContractInstance.myMethod.getData(param1 [, param2, ...]);
// myCallData = '0x45ff3ff6000000000004545345345345..'

// creation of contract object
var MyContract = web3.eth.contract(abi);

// initiate contract for an address
var myContractInstance = MyContract.at('0x78e97bcc5b5dd9ed228fed7a4887c0d7287344a9');

var result = myContractInstance.myConstantMethod('myParam');
console.log(result) // '0x25434534534'

myContractInstance.myStateChangingMethod('someParam1', 23, {value: 200, gas: 2000}, function(err, result){ ... });

var MyContract = web3.eth.contract(abi);
var myContractInstance = MyContract.at('0x78e97bcc5b5dd9ed228fed7a4887c0d7287344a9');

// watch for an event with {some: 'args'}
var myEvent = myContractInstance.MyEvent({some: 'args'}, {fromBlock: 0, toBlock: 'latest'});
myEvent.watch(function(error, result){
   ...
});

// would get all past logs again.
var myResults = myEvent.get(function(error, logs){ ... });

...

// would stop and uninstall the filter
myEvent.stopWatching();

var events = myContractInstance.allEvents([additionalFilterObject]);

// watch for changes
events.watch(function(error, event){
  if (!error)
    console.log(event);
});

// Or pass a callback to start watching immediately
var events = myContractInstance.allEvents([additionalFilterObject,] function(error, log){
  if (!error)
    console.log(log);
});

var MyContract = web3.eth.contract(abi);
var myContractInstance = MyContract.at('0x78e97bcc5b5dd9ed228fed7a4887c0d7287344a9');

// watch for an event with {some: 'args'}
var events = myContractInstance.allEvents({fromBlock: 0, toBlock: 'latest'});
events.watch(function(error, result){
   ...
});

// would get all past logs again.
events.get(function(error, logs){ ... });

...

// would stop and uninstall the filter
myEvent.stopWatching();

var source = "" + 
    "contract test {\n" +
    "   function multiply(uint a) returns(uint d) {\n" +
    "       return a * 7;\n" +
    "   }\n" +
    "}\n";
var compiled = web3.eth.compile.solidity(source);
console.log(compiled); 
// {
  "test": {
    "code": "0x605280600c6000396000f3006000357c010000000000000000000000000000000000000000000000000000000090048063c6888fa114602e57005b60376004356041565b8060005260206000f35b6000600782029050604d565b91905056",
    "info": {
      "source": "contract test {\n\tfunction multiply(uint a) returns(uint d) {\n\t\treturn a * 7;\n\t}\n}\n",
      "language": "Solidity",
      "languageVersion": "0",
      "compilerVersion": "0.8.2",
      "abiDefinition": [
        {
          "constant": false,
          "inputs": [
            {
              "name": "a",
              "type": "uint256"
            }
          ],
          "name": "multiply",
          "outputs": [
            {
              "name": "d",
              "type": "uint256"
            }
          ],
          "type": "function"
        }
      ],
      "userDoc": {
        "methods": {}
      },
      "developerDoc": {
        "methods": {}
      }
    }
  }
}

var source = "...";

var code = web3.eth.compile.lll(source);
console.log(code); // "0x603880600c6000396000f3006001600060e060020a600035048063c6888fa114601857005b6021600435602b565b8060005260206000f35b600081600702905091905056"

web3.db.putString('testDB', 'key', 'myString') // true

var value = web3.db.getString('testDB', 'key');
console.log(value); // "myString"

web3.db.putHex('testDB', 'key', '0x4f554b443'); // true

var value = web3.db.getHex('testDB', 'key');
console.log(value); // "0x4f554b443"