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getho Hackathon
ϋϯζΦϯ
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ࣗݾհ
໊લ: ࠤ౻ େี(@st_dsk)
ձࣾ: Popshoot, Inc
ݴޠ: Golang, Swift, ຊޠ, ӳޠ
ࣄ: Server/Infra ΤϯδχΞ, iOS
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ࠓ͢͜ͱ
1. ΠʔαϦΞϜʹ͍ͭͯ
2. εϚʔτίϯτϥΫτʹ͍ͭͯ
3. DApp։ൃπʔϧʹ͍ͭͯ
4. gethoʹ͍ͭͯ
5. ؆୯ͳτʔΫϯͷ࡞ͱσϓϩΠ
6. ToDoΞϓϦͷհ
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ࠓ͢͜ͱ
1. ΠʔαϦΞϜʹ͍ͭͯ
2. εϚʔτίϯτϥΫτʹ͍ͭͯ
3. DApp։ൃπʔϧʹ͍ͭͯ
4. gethoʹ͍ͭͯ
5. ؆୯ͳτʔΫϯͷ࡞ͱσϓϩΠ
6. ToDoΞϓϦͷհ
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ΠʔαϦΞϜʹ͍ͭͯ
• Ծ௨՟ͷҰछ(ETH)
• ΞϓϦέʔγϣϯϓϥοτϑΥʔϜ
• BTCͱETHͷҧ͍?
• BTC௨՟ͱͯ͠ͷׂ͕ϝΠϯ
• ETHΞϓϦέʔγϣϯΛಈ͔͢
ͨΊͷͷ೩ྉ(Ψε)
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ࠓ͢͜ͱ
1. ΠʔαϦΞϜʹ͍ͭͯ
2. εϚʔτίϯτϥΫτʹ͍ͭͯ
3. DApp։ൃπʔϧʹ͍ͭͯ
4. gethoʹ͍ͭͯ
5. ؆୯ͳτʔΫϯͷ࡞ͱσϓϩΠ
6. ToDoΞϓϦͷհ
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εϚʔτίϯτϥΫτʹ͍ͭͯ
• εϚʔτίϯτϥΫτ
• ΠʔαϦΞϜͰಈ͘ΞϓϦέʔγϣϯ
• ϊʔυʹঢ়ଶΛ࣋ͭ
• ίϯτϥΫτΞυϨε
• ։ൃݴޠ
• Solidity, Vyper ͳͲ
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Solidity
• Solidity
• εϚʔτίϯτϥΫτΛ࣮͢ΔͨΊͷݴޠ
• EVMίʔυʹίϯύΠϧ͞ΕΔ
• JavascriptϥΠΫ
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Solidity
pragma solidity ^0.4.24;
contract SimpleStore {
uint value;
function set(uint _value) public {
value = _value;
}
function get() public constant returns (uint) {
return value;
}
}
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Solidityݴޠ༷
boolean
• true or false
uint v = 123
!true // => false
v == 123 // => true
v != 123 // => false
v == 123 && true // => true
v == 123 || false // => true
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Solidityݴޠ༷
intergers
• (u)int
• (u)int8 ~ (u)int256
• int/uint(u)int256ͷΤΠϦΞε
uint x = 3
x = x + 5 // => 8
x = x * 5 // => 40
x = x / 5 // => 8
x = x % 5 // => 3
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Solidityݴޠ༷
address
• 20byteͷ(ΠʔαϦΞϜΞυϨε)
• address or address payable(>=0.5.0)
address payable x = address(0x123);
address myAddress = address(this);
if (x.balance < 10 && myAddress.balance >= 10) x.transfer(10);
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Solidityݴޠ༷
array
uint[2] fixedArr;
fixedArr[0] = 10; // [10, 0]
arr.length; // 2
string[] arr;
arr.push("apple"); // [apple]
arr.push("banana"); // [apple,banana]
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Solidityݴޠ༷
struct
struct Person {
address addr;
string name;
uint8 age;
}
Person memory p = Person(address(0xabc...), "Vitalik", 24);
p.age // => 24
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Solidityݴޠ༷
mapping
mapping(address => uint) public balances;
balances[msg.sender] = 100;
balances[msg.sender] // => 100;
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Solidityݴޠ༷
forจ
for(int i = 0; i < 20; i++) {
// do something
}
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Solidityݴޠ༷
ifจ
uint a = 1;
uint b = 2;
if (a == b) {
// do something
} else if (a != b) {
// do something
} else {
// do something
}
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Solidityݴޠ༷
Time
1 == 1 seconds
1 minutes == 60 seconds
1 hours == 60 minutes
1 days == 24 hours
1 weeks == 7 days
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Solidityݴޠ༷
Block, Transaction Properties
• blockhash(uint blockNumber) returns (bytes32)
• block.gaslimit: uint
• block.number: uint
• block.timestamp: uint
• tx.gasprice: uint
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Solidityݴޠ༷
ͦͷଞ
• msg.sender: address payable
• msg.value: uint
• now: uint
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Solidityݴޠ༷
storageͱmemory
• storage
• ϒϩοΫνΣʔϯ্ʹΔ
• gas͕͔͔Δ
• memory
• ϒϩοΫνΣʔϯ্ʹΒͳ͍
• gas͕͔͔Βͳ͍
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Solidityݴޠ༷
Function
function () {internal|external} [pure|view|payable] [returns ()]
• pure, view, payable
• pure: storageͷΞΫηεෆՄ
• view: storageͷࢀরͷΈՄ
• payable: ETHͷૹ͖ۚ
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Solidityݴޠ༷
Modifier
• ࣮ؔߦ࣌ʹҙͷॲཧΛ࣮ߦ͢Δ
contract A {
address owner;
modifier onlyOwner {
require(msg.sender == owner);
_;
}
function doSomething() public onlyOwner {
// do something if owner
}
}
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ࠓ͢͜ͱ
1. ΠʔαϦΞϜʹ͍ͭͯ
2. εϚʔτίϯτϥΫτʹ͍ͭͯ
3. DApp։ൃπʔϧʹ͍ͭͯ
4. gethoʹ͍ͭͯ
5. ؆୯ͳτʔΫϯͷ࡞ͱσϓϩΠ
6. ToDoΞϓϦͷհ
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DApp։ൃ4େπʔϧ
• ݴޠ(solidity, vyper)
• ϑϨʔϜϫʔΫ(truffle, emberk)
• IDE(Remix, EthFiddle)
• ςετ༻ϒϩοΫνΣʔϯωοτϫʔΫ(ganache, getho)
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DApp։ൃπʔϧ
• web3.js
• Truffle
• OpenZeppelin
• MetaMask
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DApp։ൃπʔϧ
web3.js
• ϊʔυʹΞΫηε͢ΔͨΊͷϥΠϒϥϦ
var Web3 = require('web3');
var web3 = new Web3();
web3.setProvider(new web3.providers.HttpProvider('http://127.0.0.1:8545'));
(web3.eth.getBalance("0x...");
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DApp։ൃπʔϧ
Truffle
• εϚʔτίϯτϥΫτΛ։ൃ͢ΔͨΊͷϑϨʔϜϫʔΫ
$ truffle init
$ truffle compile
$ truffle migrate
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DApp։ൃπʔϧ
OpenZeppelin
• εϚʔτίϯτϥΫτͷςϯϓϨʔτɺϥΠϒϥϦ
• ERC20, ERC721, SafeMathͳͲ
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DApp։ൃπʔϧ
MetaMask
• ϒϥβΥϨοτ
• ETHτʔΫϯͷߴࢀরɺૹۚ
• web3ͱ࿈ܞՄೳ
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ࠓ͢͜ͱ
1. ΠʔαϦΞϜʹ͍ͭͯ
2. εϚʔτίϯτϥΫτʹ͍ͭͯ
3. DApp։ൃπʔϧʹ͍ͭͯ
4. gethoʹ͍ͭͯ
5. ؆୯ͳτʔΫϯͷ࡞ͱσϓϩΠ
6. ToDoΞϓϦͷհ
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getho
DApp։ൃͷͨΊͷ։ൃϓϥοτϑΥʔϜ
ಛ
- ςετ༻ϒϩοΫνΣʔϯωοτϫʔΫ
- εϚʔτίϯτϥΫτͷ࣮ߦڥ
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getho
Dashboard
• ؆୯ʹىಈ
• τϥϯβΫγϣϯཤྺ
• σϑΝϧτΞΧϯτ
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No content
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getho
ίϯτϥΫτ࣮ߦ
• GUI্Ͱ࣮ߦ
• ࣮ߦ݁Ռ
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No content
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ࠓ͢͜ͱ
1. ΠʔαϦΞϜʹ͍ͭͯ
2. εϚʔτίϯτϥΫτʹ͍ͭͯ
3. DApp։ൃπʔϧʹ͍ͭͯ
4. gethoʹ͍ͭͯ
5. ؆୯ͳτʔΫϯͷ࡞ͱσϓϩΠ
6. ToDoΞϓϦͷհ
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؆୯ͳτʔΫϯͷ࡞ͱσϓϩΠ
• ࡞Δͷ
• ERC20τʔΫϯ
• ։ൃڥ
• Node
• Truffle
• OpenZeppelin
• getho
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લ४උᶃ
• gethoΞΧϯτੜ
• ͪ͜Β͔Β => https://getho.io
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લ४උᶄ
• Πϯετʔϧ
$ brew install node // Windows or Linuxͷ߹దٓ
$ npm install -g truffle
$ npm install -g openzeppelin-solidity
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લ४උᶅ
• σΟϨΫτϦੜ
$ mkdir ~/HackathonToken
$ cd ~/HackathonToken
• truffleͷॳظԽ
$ truffle init
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contractsʹϑΝΠϧΛՃ
$ touch ./contracts/HackathonToken.sol
$ vim ./contracts/HackathonToken.sol // ΤσΟλΛ։͘
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HackathonTokenͷ࣮
pragma solidity ^0.4.24;
import "openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";
import "openzeppelin-solidity/contracts/token/ERC20/ERC20Detailed.sol";
contract HackathonToken is ERC20, ERC20Detailed {
constructor(
string name,
string symbol,
uint8 decimals,
uint256 initialSupply
)
ERC20Detailed(name, symbol, decimals)
ERC20()
public
{}
}
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migrationsʹϑΝΠϧΛՃ
$ touch ./migrations/2_deploy_hackathon.js
$ vim ./migrations/2_deploy_hackathon.js // ΤσΟλΛ։͘
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σϓϩΠ༻ͷmigrationίʔυΛ࣮
var hackathon = artifacts.require("./HackathonToken.sol");
module.exports = function(deployer){
var name = "Hackathon Token";
var symbol = "HKT";
var decimals = 18;
var initialSupply = 1000000e18
deployer.deploy(hackathon, name, symbol, decimals, initialSupply, {
})
}
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truffle.jsʹωοτϫʔΫͷՃ
$ vim ./truffle.js // ΤσΟλΛ։͘
module.exports = {
networks: {
getho: {
host: ".getho.io/jsonrpc",
port: 80,
gas: 4712388,
network_id: 1010
}
}
};
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gethoʹσϓϩΠ
$ truffle migrate --network getho
// => gethoͰτϥϯβΫγϣϯ֬ೝ
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ίϯτϥΫτΛgethoʹొ
$ brew tap popshootjapan/homebrew-getho
$ brew install getho
// or go get github.com/popshootjapan/getho
$ getho login
$ getho upload ./build/contracts/HackathonToken.json \
-s
// => gethoͰίϯτϥΫτ࣮ߦ
※ gethoཧը໘্͔ΒొͰ͖·͢
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ࠓ͢͜ͱ
1. ΠʔαϦΞϜʹ͍ͭͯ
2. εϚʔτίϯτϥΫτʹ͍ͭͯ
3. DApp։ൃπʔϧʹ͍ͭͯ
4. gethoʹ͍ͭͯ
5. ؆୯ͳτʔΫϯͷ࡞ͱσϓϩΠ
6. ToDoΞϓϦͷհ
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ToDoΞϓϦͷհ
• WebΞϓϦέʔγϣϯ
http://:3000/
• ιʔείʔυ
https://github.com/daisuke310vvv/web3todo
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ϋοΧιϯΛ
ָ͠Έ·͠ΐ͏ʂʂ