Hi-Con2018 より良いDApp開発をするための話と gethoについて

by daisuke sato

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1PQTIPPU *OD %BJTVLF4BUP ΑΓྑ͍%"QQ։ൃΛ͢ΔͨΊͷ࿩ͱ HFUIPʹ͍ͭͯ

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w ࠤ౻େี w !TU@ETL w $50BU1PQTIPPU *OD w Πϯϑϥɾαʔό ࣗݾ঺հ

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w ૑ۀ೥ w ϞόΠϧΞϓϦ։ൃɾӡӦ w ΠʔαϦΞϜ 1PQTIPPU *OD

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͸͡Ίʹ

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ຊ೔ਖ਼ࣜϦϦʔε͠·ͨ͠

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%"QQ։ൃͷͨΊͷ։ൃϓϥοτϑΥʔϜ ςετ༻ ϒϩοΫνΣʔϯωοτϫʔΫ εϚʔτίϯτϥΫτ σόοΨʔ

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ςʔϚ ʮΑΓྑ͍%"QQ։ൃΛ͢ΔͨΊʹ͸ʯ

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w %"QQ։ൃ w %"QQ։ൃʹ͓͚ΔϒϩοΫνΣʔϯωοτϫʔΫ w %"QQ։ൃʹ͓͚ΔεϚʔτίϯτϥΫτͷ࣮ߦ w HFUIPʹ͍ͭͯ ࿩͢͜ͱ

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w %"QQ։ൃ w %"QQ։ൃʹ͓͚ΔϒϩοΫνΣʔϯωοτϫʔΫ w %"QQ։ൃʹ͓͚ΔεϚʔτίϯτϥΫτͷ࣮ߦ w HFUIPʹ͍ͭͯ ࿩͢͜ͱ

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%"QQͱ͸ w ෼ࢄܕΞϓϦέʔγϣϯ %FDFOUSBMJ[FE"QQMJDBUJPO w εϚʔτίϯτϥΫτΛૢ࡞͢ΔΠϯλϑΣʔεΛ࣋ͬͨ ιϑτ΢ΣΞ

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%"QQͱ͸ 8FCΞϓϦέʔγϣϯ ϞόΠϧΞϓϦ ΢ΥϨοτ ϒϩοΫνΣʔϯ  ωοτϫʔΫ /PEF /PEF /PEF /PEF /PEF εϚʔτίϯτϥΫτ ͷ࣮ߦ ΫϥΠΞϯτ ΞϓϦέʔγϣϯ ˞Ұྫͱͯ͠Ϣʔβʔ͕ૢ࡞ՄೳͳΞϓϦέʔγϣϯͷߏ੒ਤ 5Yൃߦ

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%"QQ։ൃεϚʔτίϯτϥΫτ։ൃΫϥΠΞϯτΞϓϦέʔγϣϯ։ൃ

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%"QQ։ൃͷྲྀΕ ϓϥΠϕʔτωοτ ϓϥΠϕʔτ؀ڥ ݸਓࣾ಺͔ΒͷΞΫηε  ։ൃςετ εςʔδϯά؀ڥ ੈքத͔ΒΞΫηε ࠷ऴςετ ຊ൪؀ڥ ੈքத͔ΒΞΫηε σϓϩΠͨ͠ΒมߋෆՄ ςετωοτ ϝΠϯωοτ

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%"QQ։ൃͷྲྀΕ ϓϥΠϕʔτωοτ ϓϥΠϕʔτ؀ڥ ݸਓࣾ಺͔ΒͷΞΫηε  ։ൃςετ εςʔδϯά؀ڥ ੈքத͔ΒΞΫηε ࠷ऴςετ ຊ൪؀ڥ ੈքத͔ΒΞΫηε σϓϩΠͨ͠ΒมߋෆՄ ςετωοτ ϝΠϯωοτ %"QQ։ൃ͸ϓϥΠϕʔτωοτ͔Β࢝·Δ ˞ςετωοτͰ΋Մೳ

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։ൃମ੍ εϚʔτίϯτϥΫτ ։ൃऀ ϒϩοΫνΣʔϯ ωοτϫʔΫ ΫϥΠΞϯτ։ൃऀ αʔόαΠυ։ൃऀ σϓϩΠ ςετ +40/31$8FC4PDLFU ϓϥΠϕʔτ؀ڥ

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։ൃମ੍ εϚʔτίϯτϥΫτ ։ൃऀ ϒϩοΫνΣʔϯ ωοτϫʔΫ ΫϥΠΞϯτ։ൃऀ αʔόαΠυ։ൃऀ σϓϩΠ ςετ +40/31$8FC4PDLFU ϓϥΠϕʔτ؀ڥ

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w %"QQ։ൃ w %"QQ։ൃʹ͓͚ΔϒϩοΫνΣʔϯωοτϫʔΫ w %"QQ։ൃʹ͓͚ΔεϚʔτίϯτϥΫτͷ࣮ߦ w HFUIPʹ͍ͭͯ ࿩͢͜ͱ

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%"QQ։ൃʹ͓͍ͯ ศརͳϒϩοΫνΣʔϯωοτϫʔΫͱ͸

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w ։ൃ͕༰қ w खؒɾίετ͕͔͔Βͳ͍ w ҆ఆੑɾ࣋ଓੑ͕͋Δ %"QQ։ൃ࣌ʹ͓͍ͯ ศརͳϒϩοΫνΣʔϯωοτϫʔΫ

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w ؆୯ʹΞΫηεͰ͖Δ w ΫϥΠΞϯταʔό։ൃऀɺ2"ɺςελʔͳͲ΋ w τϥϯβΫγϣϯཤྺ΍࣮ߦϩάͳͲͷ৘ใྔ͕ଟ͍ w ΤΫεϓϩʔϥʔɺσόοά৘ใ w ίϯηϯαεΞϧΰϦζϜ΍ϊʔυઃఆͷࣗ༝౓͕ߴ͍ w 1P"ɺ1P8 w QSFGVOEɺHBT౳ͷઃఆ ։ൃ͕༰қ

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w ߏஙɺӡ༻ͷखؒ w ϒϩοΫνΣʔϯͷߏஙɺӡ༻ w ӡ༻ίετ w Ͱ͖Δ͚ͩ௿ίετ खؒɾίετ

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w ϊʔυͷӡ༻ w ϊʔυͷεϖοΫ w ΫϥΠΞϯτΞοϓσʔτ w HFUIͳͲͷΞοϓσʔτ௥ै w Ӭଓੑ w DIBJOEBUBͷӬଓԽ ҆ఆੑɾ࣋ଓੑ

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w ςετωοτ w */'63" w ϩʔΧϧͷϒϩοΫνΣʔϯ w (BOBDIFɺ3FNJY+BWBTDSJQU7. w Ϋϥ΢υ্ʹཱͯͨϓϥΠϕʔτϊʔυ ϒϩοΫνΣʔϯωοτϫʔΫ

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ςετωοτ */'63" εϚʔτίϯτϥΫτ ։ൃऀ ΫϥΠΞϯτ։ൃऀ αʔόαΠυ։ൃऀ σϓϩΠ ςετ +40/31$8FC4PDLFU

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ςετωοτ */'63" εϚʔτίϯτϥΫτ ։ൃऀ ΫϥΠΞϯτ։ൃऀ αʔόαΠυ։ൃऀ σϓϩΠ ςετ +40/31$8FC4PDLFU ϝϦοτ  ɾຊ൪؀ڥʹ࠷΋͍ۙ ɾϊʔυෆཁ ɾΞΫηε͠΍͍͢ ɾແྉ ɾαʔυύʔςΟ σϝϦοτ ɾΧελϜͰ͖ͳ͍ ɾ҆ఆੑʹएׯʹෆ҆

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εϚʔτίϯτϥΫτ ։ൃऀ ΫϥΠΞϯτ։ൃऀ αʔόαΠυ։ൃऀ σϓϩΠ ςετ +40/31$8FC4PDLFU ϩʔΧϧϒϩοΫνΣʔϯ (BOBDIF 3FNJY ϩʔΧϧ1$

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εϚʔτίϯτϥΫτ ։ൃऀ ΫϥΠΞϯτ։ൃऀ αʔόαΠυ։ൃऀ σϓϩΠ ςετ +40/31$8FC4PDLFU ϩʔΧϧϒϩοΫνΣʔϯ (BOBDIF 3FNJY ϩʔΧϧ1$ ϝϦοτ ɾ؆୯ ɾσϑΥϧτΞΧ΢ϯτ ɾσόοά৘ใ σϝϦοτ ɾΞΫηεͮ͠Β͍ ɾӬଓԽͰ͖ͳ͍

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εϚʔτίϯτϥΫτ ։ൃऀ (FUI 1BSJUZ ΫϥΠΞϯτ։ൃऀ αʔόαΠυ։ൃऀ σϓϩΠ ςετ +40/31$8FC4PDLFU Ϋϥ΢υ্ʹߏஙͨ͠ϓϥΠϕʔτϊʔυ "84($1

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εϚʔτίϯτϥΫτ ։ൃऀ (FUI 1BSJUZ ΫϥΠΞϯτ։ൃऀ αʔόαΠυ։ൃऀ σϓϩΠ ςετ +40/31$8FC4PDLFU Ϋϥ΢υ্ʹߏஙͨ͠ϓϥΠϕʔτϊʔυ "84($1 ϝϦοτ ɾΧελϜ͠΍͍͢ ɾӬଓԽՄೳ ɾΞΫηε͠΍͍͢ σϝϦοτ ɾߏஙӡ༻ͷखؒ ɾ৘ใෆ଍

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ςετωοτ ϩʔΧϧ Ϋϥ΢υ্ͷ ϓϥΠϕʔτϊʔυ ։ൃ͕༰қ ˚ ؆୯ʹΞΫηε ϊʔυࣗ༝౓௿͍ ̋ νʔϜ։ൃෆ޲͖ ̋ ؆୯ʹΞΫηε ϊʔυࣗ༝౓ߴ͍ खؒ ίετ ˕ खؒෆཁɾແྉ ˕ खؒෆཁɾແྉ ˚ ߏஙͷखؒ ଟগͷίετ ҆ఆੑ ࣋ଓੑ ̋ ˚ DIBJOEBUBͷӬଓԽ͕ Ͱ͖ͳ͍ ˚ ϊʔυӡ༻͕ඞཁ ൺֱ

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w %"QQ։ൃʹదͨ͠ϒϩοΫνΣʔϯωοτϫʔΫෆ଍ w ։ൃ͕༰қ w खؒɾίετ͕͔͔Βͳ͍ w ҆ఆੑɾ࣋ଓੑ ໰୊఺

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w %"QQ։ൃ w %"QQ։ൃ࣌ʹ͓͚ΔϒϩοΫνΣʔϯωοτϫʔΫ w %"QQ։ൃ࣌ʹ͓͚ΔεϚʔτίϯτϥΫτͷ࣮ߦ w HFUIPʹ͍ͭͯ ࿩͢͜ͱ

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w ਖ਼͘͠ಈ͔͘ͷݕূ w σόοά εϚʔτίϯτϥΫτͷ࣮ߦ

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w طଘͷ࣮ߦํ๏ w 5SV⒐FDPOTPMF্͔Βୟ͘ w ϒϥ΢β*%& 3FNJY ্Ͱ࣮ߦ w 8FC D63- εϚʔτίϯτϥΫτͷ࣮ߦ

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USV⒐Fίϯιʔϧ͔Β࣮ߦ $ truffle migrate $ truffle console truffle> metaCoin = MetaCoin.at("0x345c...57e10") truffle> metaCoin.getBalance(web3.eth.coinbase) BigNumber { s: 1, e: 4, c: [ 10000 ] }

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$ truffle migrate $ truffle console truffle> metaCoin = MetaCoin.at("0x345c...57e10") truffle> metaCoin.getBalance(web3.eth.coinbase) BigNumber { s: 1, e: 4, c: [ 10000 ] } USV⒐Fίϯιʔϧ͔Β࣮ߦ ϝϦοτ ɾ8FC1SPWJEFSʹ ґଘͤͣ࢖͑Δ σϝϦοτ ɾσόοά৘ใ͕֬ೝ͠ ͮΒ͍ ɾ࣮ߦ͕ΊΜͲ͍͘͞

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3FNJY͔Β࣮ߦ

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3FNJY͔Β࣮ߦ ϝϦοτ ɾ(6*͔Β࣮ߦՄೳ ɾσόοά৘ใ͕๛෋ σϝϦοτ ɾ׳Ε͕ඞཁ

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w ࣮ߦ͕ΊΜͲ͍͘͞ w ׳Ε͕ඞཁ w σόοά͸ଟ͘ͷ࣌ؒΛऔΔ w ޮ཰Խ͍ͨ͠ ໰୊఺

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w %"QQ։ൃ࣌ͷϒϩοΫνΣʔϯωοτϫʔΫ w ։ൃ͠΍͢͞ɺखؒɾίετɺ҆ఆੑɾܧଓੑ w εϚʔτίϯτϥΫτͷ࣮ߦ w σόοά৘ใͷ๛෋͞ɺ؆୯ ·ͱΊ

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w %"QQ։ൃ࣌ʹ͓͚ΔϒϩοΫνΣʔϯωοτϫʔΫ w %"QQ։ൃ࣌ʹ͓͚ΔεϚʔτίϯτϥΫτͷ࣮ߦͱσόο ά w HFUIPʹ͍ͭͯ ࿩͢͜ͱ

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w ϓϥΠϕʔτϒϩοΫνΣʔϯͷߏஙͱӡ༻ͷखؒΛল͘ w ։ൃΛΑΓ༰қʹ w εϚʔτίϯτϥΫτͷ࣮ߦͱσόοάΛ͠΍͘͢͢Δ w σόοάޮ཰޲্ HFUIP͕ղܾ͢Δ͜ͱ

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ൺֱ ςετωοτ ϩʔΧϧ Ϋϥ΢υ্ͷ ϓϥΠϕʔτϊʔυ HFUIP ։ൃ͕༰қ ˚ ؆୯ʹΞΫηε ϊʔυࣗ༝౓௿͍ ̋ νʔϜ։ൃෆ޲͖ ̋ ؆୯ʹΞΫηε ϊʔυࣗ༝౓ߴ͍ ̋ ؆୯ʹΞΫηε ϊʔυࣗ༝౓ߴ͍ खؒ ίετ ˕ खؒෆཁɾແྉ ˕ खؒෆཁɾແྉ ˚ ߏஙͷखؒ ଟগͷίετ ̋ ख͍ؒΒͣ ແྉ͔Β࢖͑Δ ҆ఆੑ ࣋ଓੑ ̋ ˚ DIBJOEBUBͷӬଓ Խ͕Ͱ͖ͳ͍ ˚ ϊʔυӡ༻͕ඞཁ ̋ DIBJOEBUBӬଓԽ ϊʔυӡ༻ෆཁ

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ಛ௃ᶃ ϫϯΫϦοΫͰϓϥΠϕʔτϊʔυىಈ

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։ൃ͕༰қ w ͙͢࢖͑Δ w ಠࣗΤϯυϙΠϯτ w 5Yཤྺɺ࣮ߦϩά w ΧελϜىಈ w σϑΥϧτΞΧ΢ϯτ w ,FZTUPSF

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खؒɾίετ w ߏஙɾӡ༻ͷखؒͳ͠ w جຊແྉ

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҆ఆੑɾ࣋ଓੑ w DIBJOEBUBͷӬଓԽ w ΫϥΠΞϯτߋ৽ w εϖοΫௐ੔

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μογϡϘʔυը໘

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ಛ௃ᶄ εϚʔτίϯτϥΫτͷ8FCσόοΨʔ

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ίϯτϥΫτը໘

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ίϯτϥΫτը໘

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$-* $ go get github.com/popshootjapan/getho   // or  $ brew tap popshootjapan/homebrew-getho $ brew install getho IUUQTHJUIVCDPNQPQTIPPUKBQBOHFUIP

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$-* $ getho login  $ getho nodes nosy-owl-13990 mean-chicken-19748    $ getho upload ./build/contracts/MetaCoin.json -s nosy-owl-13990    $ getho contracts -s nosy-owl-13990 MetaCoin 0x6176e9ec8ab713e3ab4ca415d25f57eea52e3cd6

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w ෳ਺ϊʔυىಈ w 1P"PS1P8ͷબ୒ w ແఀࢭ w ΧελϜىಈ w εϖοΫௐ੔ w αϙʔτ Ξυόϯευ

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ͳͥ։ൃπʔϧΛ࡞͍ͬͯΔͷ͔

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&UIFSFVNΛੈʹීٴ͍ͤͯͨ͘͞Ίʹ͸ ΑΓྑ͍%"QQ͕ΑΓͨ͘͞Μ ੜ·Εͯ͜ͳ͍ͱ͍͚ͳ͍

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ΑΓྑ͍։ൃπʔϧ͕ੜ·ΕΕ͹ ΑΓྑ͍%"QQ͕ੜ·Εͯ͘Δ͸ͣ

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։ൃπʔϧ΋·ͩൃల్্

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͍·͋Δ໰୊Λղܾ͢Δ

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HFUIPͷΰʔϧ

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%"QQ։ൃπʔϧͷ σϑΝΫτελϯμʔυͱͳͬͯ &UIFSFVNͷൃలʹߩݙ͍ͯ͘͠

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ڵຯͷ͋Δ։ൃऀ΍اۀͷํ͕͍·ͨ͠Β ͝࿈བྷ͍ͩ͘͞ʂ EBJTVLF@TBUP!QPQTIPPUDPKQ !TU@ETL