gethoハッカソン -ハンズオン-

gethoハッカソンの時のハンズオンの内容です。

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1. getho Hackathon ϋϯζΦϯ
2. ࣗݾ঺հ ໊લ: ࠤ౻ େี(@st_dsk) ձࣾ: Popshoot, Inc ݴޠ: Golang, Swift, ೔ຊޠ, ӳޠ ࢓ࣄ: Server/Infra ΤϯδχΞ, iOS
3. ࠓ೔࿩͢͜ͱ 1. ΠʔαϦΞϜʹ͍ͭͯ 2. εϚʔτίϯτϥΫτʹ͍ͭͯ 3. DApp։ൃπʔϧʹ͍ͭͯ 4. gethoʹ͍ͭͯ 5. ؆୯ͳτʔΫϯͷ࡞੒ͱσϓϩΠ 6. ToDoΞϓϦͷ঺հ
4. ࠓ೔࿩͢͜ͱ 1. ΠʔαϦΞϜʹ͍ͭͯ 2. εϚʔτίϯτϥΫτʹ͍ͭͯ 3. DApp։ൃπʔϧʹ͍ͭͯ 4. gethoʹ͍ͭͯ 5. ؆୯ͳτʔΫϯͷ࡞੒ͱσϓϩΠ 6. ToDoΞϓϦͷ঺հ
5. ΠʔαϦΞϜʹ͍ͭͯ • Ծ૝௨՟ͷҰछ(ETH) • ΞϓϦέʔγϣϯϓϥοτϑΥʔϜ • BTCͱETHͷҧ͍? • BTC͸௨՟ͱͯ͠ͷ໾ׂ͕ϝΠϯ • ETH͸ΞϓϦέʔγϣϯΛಈ͔͢ ͨΊͷͷ೩ྉ(Ψε)
6. ࠓ೔࿩͢͜ͱ 1. ΠʔαϦΞϜʹ͍ͭͯ 2. εϚʔτίϯτϥΫτʹ͍ͭͯ 3. DApp։ൃπʔϧʹ͍ͭͯ 4. gethoʹ͍ͭͯ 5. ؆୯ͳτʔΫϯͷ࡞੒ͱσϓϩΠ 6. ToDoΞϓϦͷ঺հ
7. εϚʔτίϯτϥΫτʹ͍ͭͯ • εϚʔτίϯτϥΫτ • ΠʔαϦΞϜͰಈ͘ΞϓϦέʔγϣϯ • ϊʔυʹঢ়ଶΛ࣋ͭ • ίϯτϥΫτΞυϨε • ։ൃݴޠ • Solidity, Vyper ͳͲ
8. Solidity • Solidity • εϚʔτίϯτϥΫτΛ࣮૷͢ΔͨΊͷݴޠ • EVMίʔυʹίϯύΠϧ͞ΕΔ • JavascriptϥΠΫ
9. 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; } }
10. Solidityݴޠ࢓༷ boolean • true or false uint v = 123 !true // => false v == 123 // => true v != 123 // => false v == 123 && true // => true v == 123 || false // => true
11. Solidityݴޠ࢓༷ 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
12. Solidityݴޠ࢓༷ 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);
13. Solidityݴޠ࢓༷ array uint[2] fixedArr; fixedArr[0] = 10; // [10, 0] arr.length; // 2 string[] arr; arr.push("apple"); // [apple] arr.push("banana"); // [apple,banana]
14. Solidityݴޠ࢓༷ struct struct Person { address addr; string name; uint8 age; } Person memory p = Person(address(0xabc...), "Vitalik", 24); p.age // => 24
15. Solidityݴޠ࢓༷ mapping mapping(address => uint) public balances; balances[msg.sender] = 100; balances[msg.sender] // => 100;
16. Solidityݴޠ࢓༷ forจ for(int i = 0; i < 20; i++) { // do something }
17. Solidityݴޠ࢓༷ ifจ uint a = 1; uint b = 2; if (a == b) { // do something } else if (a != b) { // do something } else { // do something }
18. Solidityݴޠ࢓༷ Time 1 == 1 seconds 1 minutes == 60 seconds 1 hours == 60 minutes 1 days == 24 hours 1 weeks == 7 days
19. Solidityݴޠ࢓༷ Block, Transaction Properties • blockhash(uint blockNumber) returns (bytes32) • block.gaslimit: uint • block.number: uint • block.timestamp: uint • tx.gasprice: uint
20. Solidityݴޠ࢓༷ ͦͷଞ • msg.sender: address payable • msg.value: uint • now: uint
21. Solidityݴޠ࢓༷ storageͱmemory • storage • ϒϩοΫνΣʔϯ্ʹ࢒Δ • gas͕͔͔Δ • memory • ϒϩοΫνΣʔϯ্ʹ࢒Βͳ͍ • gas͕͔͔Βͳ͍
22. Solidityݴޠ࢓༷ Function function (<parameter types>) {internal|external} [pure|view|payable] [returns (<return types>)] • pure, view, payable • pure: storage΁ͷΞΫηεෆՄ • view: storage΁ͷࢀরͷΈՄ • payable: ETHͷૹۚ෇͖
23. Solidityݴޠ࢓༷ Modifier • ؔ਺࣮ߦ࣌ʹ೚ҙͷॲཧΛ࣮ߦ͢Δ contract A { address owner; modifier onlyOwner { require(msg.sender == owner); _; } function doSomething() public onlyOwner { // do something if owner } }
24. ࠓ೔࿩͢͜ͱ 1. ΠʔαϦΞϜʹ͍ͭͯ 2. εϚʔτίϯτϥΫτʹ͍ͭͯ 3. DApp։ൃπʔϧʹ͍ͭͯ 4. gethoʹ͍ͭͯ 5. ؆୯ͳτʔΫϯͷ࡞੒ͱσϓϩΠ 6. ToDoΞϓϦͷ঺հ
25. DApp։ൃ4େπʔϧ • ݴޠ(solidity, vyper) • ϑϨʔϜϫʔΫ(truffle, emberk) • IDE(Remix, EthFiddle) • ςετ༻ϒϩοΫνΣʔϯωοτϫʔΫ(ganache, getho)
26. DApp։ൃπʔϧ • web3.js • Truffle • OpenZeppelin • MetaMask
27. 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...");
28. DApp։ൃπʔϧ Truffle • εϚʔτίϯτϥΫτΛ։ൃ͢ΔͨΊͷϑϨʔϜϫʔΫ $ truffle init $ truffle compile $ truffle migrate
29. DApp։ൃπʔϧ OpenZeppelin • εϚʔτίϯτϥΫτͷςϯϓϨʔτɺϥΠϒϥϦ • ERC20, ERC721, SafeMathͳͲ
30. DApp։ൃπʔϧ MetaMask • ϒϥ΢β΢ΥϨοτ • ETH΍τʔΫϯͷ࢒ߴࢀরɺૹۚ • web3ͱ࿈ܞ΋Մೳ
31. ࠓ೔࿩͢͜ͱ 1. ΠʔαϦΞϜʹ͍ͭͯ 2. εϚʔτίϯτϥΫτʹ͍ͭͯ 3. DApp։ൃπʔϧʹ͍ͭͯ 4. gethoʹ͍ͭͯ 5. ؆୯ͳτʔΫϯͷ࡞੒ͱσϓϩΠ 6. ToDoΞϓϦͷ঺հ
32. getho DApp։ൃͷͨΊͷ։ൃϓϥοτϑΥʔϜ ಛ௃ - ςετ༻ϒϩοΫνΣʔϯωοτϫʔΫ - εϚʔτίϯτϥΫτͷ࣮ߦ؀ڥ
33. getho Dashboard • ؆୯ʹىಈ • τϥϯβΫγϣϯཤྺ • σϑΝϧτΞΧ΢ϯτ
35. getho ίϯτϥΫτ࣮ߦ • GUI্Ͱ࣮ߦ • ࣮ߦ݁Ռ
37. ࠓ೔࿩͢͜ͱ 1. ΠʔαϦΞϜʹ͍ͭͯ 2. εϚʔτίϯτϥΫτʹ͍ͭͯ 3. DApp։ൃπʔϧʹ͍ͭͯ 4. gethoʹ͍ͭͯ 5. ؆୯ͳτʔΫϯͷ࡞੒ͱσϓϩΠ 6. ToDoΞϓϦͷ঺հ
38. ؆୯ͳτʔΫϯͷ࡞੒ͱσϓϩΠ • ࡞Δ΋ͷ • ERC20τʔΫϯ • ։ൃ؀ڥ • Node • Truffle • OpenZeppelin • getho
39. લ४උᶃ • gethoΞΧ΢ϯτੜ੒ • ͪ͜Β͔Β => https://getho.io
40. લ४උᶄ • Πϯετʔϧ $ brew install node // Windows or Linuxͷ৔߹͸దٓ $ npm install -g truffle $ npm install -g openzeppelin-solidity
41. લ४උᶅ • σΟϨΫτϦੜ੒ $ mkdir ~/HackathonToken $ cd ~/HackathonToken • truffleͷॳظԽ $ truffle init
42. contractsʹϑΝΠϧΛ௥Ճ $ touch ./contracts/HackathonToken.sol $ vim ./contracts/HackathonToken.sol // ΤσΟλΛ։͘
43. 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 {} }
44. migrationsʹϑΝΠϧΛ௥Ճ $ touch ./migrations/2_deploy_hackathon.js $ vim ./migrations/2_deploy_hackathon.js // ΤσΟλΛ։͘
45. 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, { }) }
46. truffle.jsʹωοτϫʔΫͷ௥Ճ $ vim ./truffle.js // ΤσΟλΛ։͘ module.exports = { networks: { getho: { host: "<YOUR SUBDOMAIN>.getho.io/jsonrpc", port: 80, gas: 4712388, network_id: 1010 } } };
47. gethoʹσϓϩΠ $ truffle migrate --network getho // => gethoͰτϥϯβΫγϣϯ֬ೝ
48. 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 <YOUR SUBDOMAIN> // => gethoͰίϯτϥΫτ࣮ߦ ※ getho؅ཧը໘্͔Β΋ొ࿥Ͱ͖·͢
49. ࠓ೔࿩͢͜ͱ 1. ΠʔαϦΞϜʹ͍ͭͯ 2. εϚʔτίϯτϥΫτʹ͍ͭͯ 3. DApp։ൃπʔϧʹ͍ͭͯ 4. gethoʹ͍ͭͯ 5. ؆୯ͳτʔΫϯͷ࡞੒ͱσϓϩΠ 6. ToDoΞϓϦͷ঺հ
50. ToDoΞϓϦͷ঺հ • WebΞϓϦέʔγϣϯ http://<ip>:3000/ • ιʔείʔυ https://github.com/daisuke310vvv/web3todo
51. ϋοΧιϯΛ ָ͠Έ·͠ΐ͏ʂʂ