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HL-Report コントラクト開発裏話 / Developing Contracts of ...
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Roadagain
December 17, 2018
Programming
750
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HL-Report コントラクト開発裏話 / Developing Contracts of HL-Report
blockchain.tokyo#15で発表した資料です。
HL-Reportのコントラクトを開発するに当たり、注意した点やつまづいた点をまとめました。
Roadagain
December 17, 2018
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Transcript
)-3FQPSU ίϯτϥΫτ։ൃཪ גࣜձࣾϞόΠϧϑΝΫτϦʔ ΤϯδχΞࢁڹ
ࣗݾհ ࢁڹ גࣜձࣾϞόΠϧϑΝΫτϦʔ ΤϯδχΞ ৽ଔ 5XJUUFS!SJOHPI (JU)VC3PBEBHBJO
࣍ w)-3FQPSUͱ w)-3FQPSUͷಛ wνϡʔχϯά w݁Ռ w͓·͚
)-3FQPSUͱ
)-3FQPSUͱ ฐࣾͰӡӦ͍ͯͨ͠ҐஔήʔϜ ʮϨΩγτίωΫτʯͷࢿ࢈Λ ׆༻ͨ͠%"QQT
)-3FQPSUͱ ϓϨΠϠʔͷࢿ࢈ΛϒϩοΫνΣʔϯʹ Ҡ২ͯ͠ɺαʔϏεऴྃޙҭͯͨ ΩϟϥΫλʔͨͪʹձ͑ΔαʔϏε
)-3FQPSUͷಛ
)-3FQPSUͷಛ τʔΫϯΛҰؾʹൃߦ HBTΛαʔϏεఏڙऀ͕ෛ୲ τʔΫϯΛചങͰ͖ͳ͍
)-3FQPSUͷಛ ࣮࣭తʹ͍ͬͯΔͷ%#ͷҠ τʔΫϯൃߦ˺&UIFSFVNͷอଘ
)-3FQPSUͷಛ HBTͱτʔΫϯചങʹ͍ͭͯ๏తͳ ৄ͘͠աڈެ։ͨ͠6OJRZT1SPKFDUͷ εϥΠυ IUUQTTQFBLFSEFDLDPNSF@OLZNEBQQTHBNFEFTJHOBOEOPUFT
νϡʔχϯά
HBTઅ͍ͨ͠ νϡʔχϯά
νϡʔχϯά ύϥϝʔλΛݶք·ͰΔ wը૾ w໊લ wઆ໌จ wϨϕϧࢉग़εςʔλε
νϡʔχϯά ίϯτϥΫτεϦϜԽ &OVNFSBCMFͬͨΓͱ͔ NBQQJOHΛྻʹͨ͠Γͱ͔
νϡʔχϯά ίενϡʔϜ'VOHJCMF5PLFO ˠݸίϯτϥΫτཧͰ͖ͳ͍ &3$ΛͬͯҰׅཧ
νϡʔχϯά τϥϯβΫγϣϯεϦϜԽ ෳͷτʔΫϯΛ·ͱΊͯ͢Δ ֤ύϥϝʔλΛͦΕͧΕྻͰ͛Δ &3$ݩ͔ΒͰ͖ΔΑ͏ʹͳ͍ͬͯͨ
νϡʔχϯά ࣮ࡍͷίʔυ
݁Ռ
݁Ռ ൃߦτʔΫϯ ΩϟϥΫλʔମ ணͤସ͑ҥछྨ ແࣄʹྃɺϛεͳ͠
݁Ռ τϥϯβΫγϣϯ૯ ແࣄʹ͓Ҿӽྃ͠͠·ͨ͠
·ͱΊ
·ͱΊ طଘσʔλͷτʔΫϯԽΩπ͍ ྗෆͳ෦ଟ͋ͬͨ͘ Ͱָ͍͠ τʔΫϯԽ·ͨΓ͍ͨ
͓·͚ ͱ͍͏໊ͷۤ࿑
0QFO;FQQFMJO 0QFO;FQQFMJOͷίʔυ͕(JU)VCͱOQN Ͱҧͬͨ (JU)VC3$ OQN
0QFO;FQQFMJO ओʹӨڹ͕͋ͬͨͷ͜Ε 4FQBSBUFE&3$JOUPUIFEJGGFSFOU PQUJPOBMJOUFSGBDFT BOE JOUSPEVDFE&3$'VMMXIJDI JNQMFNFOUTBMM
0QFO;FQQFMJO ղܾࡦ
τʔΫϯ໊ͱTZNCPM τʔΫϯͷ໊લͱTZNCPMͰΉ ΞϓϦදݱͷྲྀ༻ߟ͕͑ͨʜ $SZQUP,JUUJFTˠ$,Έ͍ͨʹΓ͍ͨ
τʔΫϯ໊ͱTZNCPM ͪΐ͏Ͳ͜ͷ࣌ظʹ.$)͕ϓϨηʔϧ ίʔυެ։͞Ε͍ͯͨͷͰ໊લͷࢀߟʹ MyCryptoHeroes:HeroˠHL-Report:Ijin TZNCPM͍Ζ͍Ζߟ͑ͨ݁ՌIJINʹ ΩϟϥΫλʔͰ͋Δ͜ͱ͕͙͢ʹ͔Δ ଞͱ͔ͿΓʹ͍͘
τʔΫϯ໊ͱTZNCPM ணͤସ͑ҥͷτʔΫϯ໊ήʔϜͱಉ͡ TZNCPMCOSͰ౷Ұ छྨTZNCPMߟ͍͑ͯΔ༨༟͕ͳ͍ ίενϡʔϜˠ$PTUVNFˠ$04
ςετωοτͰͷࢼݧൃߦ ͍͖ͳΓຊ൪ා͍͔ΒςετωοτͰ ͓ࢼ͍ͨ͠͠ 3JOLFCZͰ͓ࢼ͠ɺ͍͔ͭ͘ൃݟ͕͋ͬͨ
ςετωοτͰͷࢼݧൃߦ ςετωοτ༻ͷ໊લΛ༻ҙ͢͠
ςετωοτͰͷࢼݧൃߦ ଞͷൃݟ HBOBDIFΑΓऔΓࠐΈ͕͍ UPUBM4VQQMZ͕ͳ͍
ຊ൪ൃߦ ϝΠϯωοτUSVGqFDPOTPMF͕λΠϜ Ξτ͢Δ ͪΌΜͱൃߦͰ͖͍ͯΔ͜ͱΛفͬͯؼ
ຊ൪ൃߦ 5Yࢭ·ͬͯՃൃߦ͠·ͨ͠
ίʔυQVCMJTI ίʔυQVCMJTI͠·ͨ͠ ΩϟϥΫλʔ &3$ϕʔε IUUQTFUIFSTDBOJPUPLFOYCCDGEECEFBCGFE ͖͔ͤ͑ҥ &3$ϕʔε IUUQTFUIFSTDBOJPBEESFTTYCCDEFGFC
ίʔυQVCMJTI ʮ͜ͷίʔυTPMIJOU௨Βͳ͍ʯ externalΛpublicͷޙΖʹஔ͘ͱ͍͏SVMF
͓·͚ͷ͓·͚
ϦϦʔεલ τʔΫϯϑϩϯτͷެ։લ ϦϦʔεલʹόϨͳ͍͔ෆ҆ͩͬͨ ˠ࣮ࡍશવͦͷؾ͕ͳ͔ͬͨ ϒϩοΫνΣʔϯΛΒͳ͍ਓ Ҿ͖ࠐΉ͜ͱ͕Ͱ͖ͨͱղऍ͢Δ
ϦϦʔεޙ ͻͨ͢ΒΤΰα Ϣʔβʔ͕تΜͰ͍Δɺٽ͍͍ͯΔ ਓੜͰҰ൪ָ͍͠
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