Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Speaker Deck
PRO
Sign in
Sign up for free
BlockchainTokyo23.pdf
biga816
November 29, 2019
Technology
1
310
BlockchainTokyo23.pdf
biga816
November 29, 2019
Tweet
Share
More Decks by biga816
See All by biga816
BuidlMeetupVol2.pdf
biga816
0
17
Service Worker Cache Problems
biga816
0
1k
Consider how distributed IPFS is
biga816
2
3.1k
Centralized Dapps to read from Dapps game
biga816
1
1.7k
Usage of ethereum libraries for dapps
biga816
0
4.1k
Other Decks in Technology
See All in Technology
AutoMLを利用した機械学習モデル構築時に意識すること
sbtechnight
0
140
DeepDive into Modern Development with AWS
mokocm
1
320
20220803投資先CXO候補者向け 会社紹介資料_合同会社BLUEPRINT
hik
0
160
Cloud Foundryの移行先はどこか? オープンソースPaaS探し
kolinz
0
340
eBPF-based Container Networking
johnlin
2
1.1k
EC/CRMの自社サービス開発をマネジメントするようになって1年でやってきたこととこれから / devio2022-takano-sho-road-to-good-development-team-management
masaru_b_cl
0
370
テクニカルライティングの検定を受けてみた話 / "My Story About Taking the Technical Writing Exam
line_developers
PRO
1
190
バッファープールが大きいMySQL v5.7でDROP DATABASEが詰まった原因と対策 / Causes and Remedies for DROP DATABASE Stuck in MySQL v5.7 with Large Buffer Pool
line_developers
PRO
4
690
Step-by-Step MLOps and Microsoft Products
shisyu_gaku
1
480
ジョブ管理システムをAWS Step Functionsに移行する時の勘所
non97
0
470
AWSで実現する「好き」の感情 / Develop Suki by AWS #devio2022
syobochim
1
240
脆弱性スキャナのOWASP ZAPを コードベースで扱ってみる / OWASP ZAP on a code base
task4233
1
200
Featured
See All Featured
Ruby is Unlike a Banana
tanoku
91
9.3k
Testing 201, or: Great Expectations
jmmastey
21
5.5k
The Invisible Side of Design
smashingmag
290
48k
For a Future-Friendly Web
brad_frost
166
7.5k
No one is an island. Learnings from fostering a developers community.
thoeni
9
1.3k
BBQ
matthewcrist
74
7.9k
Code Reviewing Like a Champion
maltzj
506
37k
Helping Users Find Their Own Way: Creating Modern Search Experiences
danielanewman
7
1.1k
Producing Creativity
orderedlist
PRO
334
37k
The World Runs on Bad Software
bkeepers
PRO
57
5.4k
Why You Should Never Use an ORM
jnunemaker
PRO
47
7.6k
Intergalactic Javascript Robots from Outer Space
tanoku
260
25k
Transcript
%BQQTʹ͓͚Δ ΞʔΩςΫνϟͱͭΒΈ BLJIJSP UBOBLB
%BQQ։ൃ4QFDJBMʂ
%BQQ։ൃ4QFDJBMʂ
%BQQ։ൃ4QFDJBMʂ
αϒίϯςϯπ࢝·Γ·͢
ࣗݾհాதতത !CJHB #6*%-ϒϩοΫνΣʔϯΤϯδχΞɻ ৽ଔͰΞΫηϯνϡΞʹೖࣾޙɺ4*8&#ϞόΠϧΞϓϦͷ։ ൃϦʔυΛ୲ɻ ʹ.U(09Ͱશࣦͯͬͨ͜ͱ͔ΒϒϩοΫνΣʔϯʹ ֮ΊɺԼΞΠυϧ͚%"QQTͳͲΛख͕͚ͨɻ ݱࡏ#6*%-ʹͯ4)*&%-ͷ։ൃΛ୲͍ͯ͠Δɻ 5ZQF4DSJQU͕͖ɻ
։ൃͨ͠ΞϓϦέʔγϣϯͨͪ
اۀ͚ͷίϯαϧɾ։ൃଟ࣮ࢪத
ΞʔΩςΫνϟΛߟ͑Δ
%"QQTΞʔΩςΫνϟͷλΠϓ ϑϩϯτ݁ܕ Ψεߦܕ ΧετσΟܕ Φʔφʔϑϧݖݶܕ
ϑϩϯτ݁ܕ .FUB.BTLͳͲͷϒϥβΥϨοτΛ༻͍ͯΫϥΠΞϯτଆ ͔ΒτϥϯβΫγϣϯΛൃߦ͠ɺαʔόʔଆॲཧΛඞཁͱ͠ͳ͍ λΠϓ Front Node Server DB Tx
Ψεߦܕ .FUB.BTLͳͲͷϒϥβΥϨοτΛ༻͍ͯΫϥΠΞϯτଆ Ͱॺ໊͠ɺτϥϯβΫγϣϯͷൃߦΛαʔόʔଆͰ࣮ߦ͢ΔλΠ ϓ Front Node Server DB 署名付 Tx
ΧετσΟܕ Ϣʔβʔͷݤอɺॺ໊ɺτϥϯβΫγϣϯͷൃߦΛશͯαʔ όʔଆͰ࣮ߦ͢ΔλΠϓ Front Node Server DB Tx
Φʔφʔϑϧݖݶܕ ϢʔβʔͷݤอͤͣɺΦʔφݖݶΛ࣋ͬͨΞυϨεΛ༻͍ͯ αʔόʔଆͰτϥϯβΫγϣϯͷൃߦΛ࣮ߦ͢ΔλΠϓ ˞ϢʔβʔͷΥϨοτΞυϨεͱΞΧϯτใͷඥ͚ΛαʔόʔଆͰ͓࣋ͬͯ͘έʔε͋Δ Front Node Server DB Tx PXOFS
VTFS
ͲͷΞʔΩςΫνϟʹ͢Δ͖͔ λʔήοτ͕ҰൠϢʔβʔͷ߹ɺΧετσΟܕPSΦʔφʔϑ ϧݖݶܕʹ͢Δ # ϚωʔδυαʔϏε͕͑ΔέʔεͰɺ,BMFJEPΛ͏ͷ͕Ұ൪ָ ݤཧτϥϯβΫγϣϯཤྺཧ͕ෆཁɺ"1*ͰίϯτϥΫτ͕ίʔϧͰ͖Δ ݤฆࣦ࣌ʹϦΧόϦʔͰ͖Δ%*%ͳͲΛಋೖͰ͖Δ߹ϑϩϯ τ݁ܕΨεߦܕ༗ޮ # ͨͩ͠ɺΞʔΩςΫνϟͱͯ͠ෳࡶʹͳΔ
৭ʑͳͭΒΈ
τϥϯβΫγϣϯཤྺͷཧ લఏ # αʔόʔαΠυͰτϥϯβΫγϣϯΛൃߦ͢Δ # ύϒϦοΫνΣʔϯ ͭΒΈͱରԠ # ϢʔβʔʹτϥϯβΫγϣϯ͕֬ఆͨ͠ͷ͔Ͳ͏͔௨͢ΔͨΊʹτ ϥϯβΫγϣϯͷཤྺͱεςʔλεΛ%#ʹอ࣋͢Δඞཁ͕͋ΔͨΊɺ
ఆظతʹτϥϯβΫγϣϯΛࢹ͢Δඞཁ͕͋Δɻ # ޮΛߟ͑ͯશτϥϯβΫγϣϯͷεςʔλεΛࢹͤͣΠϕϯτ ͷࢹΛߦ͏͜ͱ͕ଟ͍͕ɺXFCKTͷXFCTPDLFUͷίωΫγϣϯ ͨ·ʹΕΔ͠ɺରΠϕϯτ͕૿͑ΔͱΧΦεʹͳΓ͕ͪɻ
τϥϯβΫγϣϯཤྺͷཧ export class HogeService { : connect(): void { const
provider = new Web3.providers.WebsocketProvider(GETH.HOST); const reconnect = () => { const interval = this.isReconnection ? 1000 : 0; setTimeout(() => { this.isReconnection = true; this.connect(); this.observer.next(false); }, interval); }; provider.on("error", () => reconnect()); provider.on("end", () => reconnect()); provider.on("connect", () => { this.isReconnection = false; this.observer.next(true); }); this.web3 = new Web3(provider); } on(): Observable<any> { const observable = new Observable((observer: Subscriber<any>) => { this.observer = observer; return; }); return observable; } : } export class Hoge { : async run(): Promise<void> { this.hogeService.on().subscribe(async (isConnected: boolean) => { if (isConnected) { this.watchEvents(); this.fetchPastBlocks(); } }); this.web3Service.connect(); } : }
%#ͱετϨʔδͷ࿈ܞ લఏ # ύϒϦοΫνΣʔϯϓϥΠϕʔτνΣʔϯ ͭΒΈͱରԠ # ݕࡧҰཡςʔϒϧͷදࣔ࣌ͷརศੑ্ͷͨΊʹɺετϨʔδʹॻ ͖ࠐΜͩσʔλΛ%#ʹ࿈ܞ͢Δඞཁ͕͋Δɻ # %#ͷॻ͖ࠐΈΛτϥϯβΫγϣϯͷൃߦΛಉ࣌ʹ͢Δ߹ɺΤ
ϥʔϋϯυϦϯά͕͍͠ɻ # ΠϕϯτΛࢹͯ͠%#ʹॻ͖ࠐΉ߹ɺڞ௨ԽͰ͖ͳ͍ͱࢹର ͕૿͑ͯॲཧ͕ΧΦεʹͳΓ͕ͪɻͲ͏͠Α͏ͳ͍ɻ
(BT-JNJU લఏ # αʔόʔαΠυͰτϥϯβΫγϣϯΛൃߦ͢Δ # ύϒϦοΫνΣʔϯ ͭΒΈͱରԠ # 8FCKTͷFTUJNBUF(BTΛ༻͍ͯHBT-JNJUΛઃఆ͍͕ͨ͠ɺ࣮ࡍͷফ අHBTΛԼճͬͨΓɺ#MPDLͷHBT-JNJUΛ͑ͯΤϥʔΛు͍ͨΓͯ͠
҆ఆ͠ͳ͍͜ͱ͕ͨ·ʹ͋Δɻ # ݁ہ࣮ࡍͷফඅHBTʹগ͠ΛόοϑΝΛ࣋ͨͨ͠ݻఆͱ͢Δͷ͕҆ ఆͦ͠͏ɻͨͩফඅHBTΛࢉग़͢Δͷ͕໘ɻ
/PODF લఏ # αʔόʔαΠυͰτϥϯβΫγϣϯΛൃߦ͢Δ # ύϒϦοΫνΣʔϯϓϥΠϕʔτνΣʔϯ ͭΒΈͱରԠ # ͭͷϓϩηεͰෳͷίϯτϥΫτͷϝιουΛಉ࣌ʹ࣮ߦ͢Δ ߹ɺ/PODFΛਖ਼͘͠ΠϯΫϦϝϯτ͠ͳ͍ͱΤϥʔʹɻ
# ͨͩͭͣͭ͠ॲཧ͕ऴΘΔͷΛ͍ͬͯͯͱͯඇޮɻ # ಉ࣮࣌ߦ࣌ΠϯΫϦ͢ΔλΠϛϯάΛ͢Δඞཁ͕͋Δɻ
/PODF export class SampleService { : call(): void { const
provider = new Web3.providers.WebsocketProvider(GETH.HOST); : let nonce = await this.web3Service.getPendingTxCount(ADDRESS); const getNonce = () => { const rv = nonce; nonce += 1; return rv; }; await Promise.all([ this.web3Service.send( contract, ‘setFoo’, { foo: 'bar' }, getNonce() ), this.web3Service.send( contract, 'setHage’, { hage: true }, getNonce() ), ]); } : }
ίϯτϥΫτංେԽ લఏ # ύϒϦοΫνΣʔϯ ͭΒΈͱରԠ # &3$ɺͳͲΛࢀরΛ͢ΔΑ͏ͳίϯτϥΫτΛ࡞͢ Δ߹ɺ୯७ʹJNQPSU͢ΔͱJNQPSUͨ͠ίϯτϥΫταΠζ͕ංେ Խͯ͠͠·͏ɻ #
ΠϯλʔϑΣʔε͚ͩJNQPSUͯ͠ΠϯελϯεԽͯ͠͠·͑ղܾʂ
ίϯτϥΫτංେԽ pragma solidity ^0.5.0; : contract IERC20 { function balanceOf(address
address) public returns (uint256); } contract HogeContract { function balanceOf(address token, address holder) external { return IERC20(token).balanceOf(holder); } : }
ಈ࡞֬ೝਏ͗͢ લఏ # ͳ͠ ͭΒΈͱରԠ # ґଘ͢ΔίϯτϥΫτ͕૿͑Δͱɺ3FNJYͩͱಈ࡞͢Δঢ়ଶ͍࣋ͬͯ ͘ͷ͕େมɻ # ͞ΒʹίϯτϥΫτΛԿίʔϧ͍ͯ͠ΔͱϑϦʔζͯ͠ಈ͔ͳ͘
ͳΔ͜ͱɻɻ # ͦ͜Ͱ4PMJEJUZͦ͜ςετۦಈ։ൃɻςετΛॻ͍͔ͯΒಈ͘Α͏ʹί ϯτϥΫτΛमਖ਼͠Α͏ʂ
ಈ࡞֬ೝਏ͗͢ const FooMarket = artifacts.require('FooMarket'); const HogeToken = artifacts.require('HogeToken'); :
contract('FooMarket', function ([owner, alice]) { beforeEach(async function () { this.HodeToken = await HogeToken.new(); this.FooMarket = await FooMarket.new(this.HodeToken.address, { from: owner }); await this.FooMarket.setWhitelisted(owner, true, { from: owner }); await this.FooMarket.setWhitelisted(alice, true, { from: owner }); }); describe('transfer hoge token', function () { it('token balance should be changed', async function () { await this.HogeToken.mint(alice, 100, { from: owner }); assert(await this.FooMarket.transfer(alice, bob, 100, { from: owner })); const aliceBalance = await this.HogeToken.balanceOf(alice); const bobBalance = await this.HogeToken.balanceOf(bob); assert.equal(aliceBalance, 0); assert.equal(bobBalance, 100); }); }); : });
4PMJEJUZͷ͕ͤ͘ڧ͗͢ લఏ # ͳ͠ ͨͩͷͭΒΈ # جຊGPS͑ͳ͍ɻͦͷͨΊಾͷঢ়ଶΛཧ͢Δม͕૿͑ͯ͠· ͏͜ͱ͕ଟʑ͋Δɻ # ྻͷআͷ༷͕͍·͍ͪͰਏ͍ɻྻͷॱ൪͕୲อ͞Εͳ͍ಾͷ
ํ๏͕ඞཁʹͳΔͷͰɺ·ͨঢ়ଶΛཧ͢Δม͕૿͑ͯ͠·͏ɻ # ͦͯ͠TUBDLUPPEFFQɻɻɻ
4PMJEJUZͷ͕ͤ͘ڧ͗͢ contract Hoge { uint256[] private targetValues; mapping(uint256 => uint256)
private targetValuesIndex; mapping(uint256 => bool) private valueStatus; function add(uint256 _targetId) public { require(!exists(_targetId)); targetValuesIndex[_targetId] = targetValues.push(_targetId) - 1; valueStatus[_targetId] = true; } function remove(uint256 _targetId) public { require(exists(_targetId)); uint256 targetIndex = targetValuesIndex[_targetId]; uint256 lastIndex = targetValues.length - 1; uint256 lastTargetId = targetValues[lastIndex]; valueStatus[_targetId] = false; targetValues[targetIndex] = lastTargetId; targetValues.length--; targetValuesIndex[lastTargetId] = targetIndex; targetValuesIndex[_targetId] = 0; } function exists(uint256 _targetId) public view returns (bool) { return valueStatus[_targetId]; } }
݁ہҰ൪ͷղܾࡦ
ίϯτϥΫτΛॻ͔ͳ͍
!CJHB