Perl to Go

YAPC::Tokyo 2019 で発表した内容になります

Transcript

1. Perl to Go
   Yuji Shimada @xaicron
   YAPC::TOKYO 2019 ASAKUSABASHI HULIC HALL & HULIC CONFERENCE
   Jan, 26 2019 [SAT]
   

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2. Ε΀ͫΩ Go 䨗͚ͼΔͯ͡Ҙ
   

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3. 㰜΅݄ଙ΄Ӿ殹͡Ο䨗ͣতΗΔͭ͵
   

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4. ͩ΄ϕЄμͽ΅ Perl Ψ 10ଙͦΟ͚՛Ԫͽ
   䨗ͣ姆ͧͼͣ͵ͮͫ͠Ω͢ Go ͽ Web API
   Ψ֢͹ͼ஑͵Ӟ᭗Π΄ίϹΨ࣮΢ၞͯΘ΄
   ΁΀ΠΔͯ
   

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5. Go ͽ WebίϤϷξЄτϴЀΨ䨗ͥၞ΢͢
   ͬ͹ͥΠഽΗΡ;Ξ͚ͽͯ΃
   

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6. ΅͚
   

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7. ίυδЀύ
   • ΀Ͳ Go ͡
   • Perl Monger ͢ Golang ΨতΗΞ͜͹ͼ䦒΁Ϝϫ͹͵;ͩΣ
   • Go ΄᥺承՛䯭ͽ਍Ό Perl ;΄ፘ晅ᅩ
   • Web API Ψ֢͹ͼΕΞ͜
   • ϓφϕΨ䨗ͥ
   • Docker Ϡϸϖͭͼ㵕ͯ͡
   • Δ;Η
   

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8. ΀Ͳ Go ͡
   

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9. ΀Ͳ Go ͡
   • ίυδЀύ
   • WebςЄϝЄ;ͭͼΕ͵ Go
   • πϫЀϖ϶αЀϑЄϸ;ͭͼΕ͵ Go
   

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10. WebςЄϝЄ;ͭͼΕ͵ Go (1)
    • ฌՔ΅ηЀϤϹΨ晁አͯΡ΄΅ύγЀϕϹЀϖ΁΀͹ͼͣͼ͚
    Ρ
    • μ϶γϖӤͽͭ͡ΘπЀϓϗӤͽίϤϷξЄτϴЀΨ㵕ͯͩ͡
    ;͢୮ᆐ΁΀͹ͼ͚Ρ
    

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11. WebςЄϝЄ;ͭͼΕ͵ Go (2)
    • πЀϓϗ΅ηЀϤϹ;ྲΏΡ;涥ͥΑͿ΄֗φϧϐμ΄ςЄϝЄӤͽ㵕̵ͭ͡
    හ܈뺶හጯݣ㪔ΏΡΞ͜΀ොݻ
    • ςЄϝЄ΄φϧϐμ͚֗͢͵Ηṛ᭛ͽ㵕̵֢ͭ͡ͺϮϯϷ㵁ሲΘΞ͚᥺承͢࿢
    ΗΟ΢Ρ
    • ͫΟ΁πЀϓϗᛔ֛΄ςαχΘੜͫͥͭ͵Α͜͢Ӟᛱጱ΁᩸㵕᭛ଶ͢Ӥ͢Ρ͵
    Ηੜͫͥͭ͵͚
    • φμϷϤϕ᥺承΄Ξ͜΁϶Ѐόαϭ͢஠ᥝ΀Θ΄΅හጯMBΨ᩻͞ͼͭΔ͚᭿
    ͧ͵͚
    

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12. WebςЄϝЄ;ͭͼΕ͵ Go (3)
    • Go ΄䁰ݳ΅
    • ϝαϗϷΨ֢౮ͯ΢Ά϶Ѐόαϭ͢஠ᥝ΀͚͵ΗπЀϓϗ΄ςαχΨಪ
    ͞Ρͩ;͢ͽͣΡ
    • ฦ᭗΁䨗ͥͶͧͽ Java Κ C ΁܃䤔ͯΡΑͿṛ᭛͡ͺ፜ϮϯϷͽ㵕֢ͯΡ
    • gorutine ΁ΞΠ̵ᛔᆐ;㵁ሲጱ΁CPU;ᑮ樌ΨڥአͯΡͩ;͢ͽͣΡ
    • Ӥ懿΄ᇙ䖀΅ηЀϤϹͽΘ㱢֖΁㰕ͥ
    

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13. πϫЀϖ϶αЀϑЄϸ;ͭͼΕ͵ Go (1)
    • 樄咲ᘏ͡ΟͯΡ;
    • CPUΚϮϯϷ΄௔ᚆ͢Ӥ͢͹͵΄; go ΄πЀϞαϸᛔ֛͢ṛ
    ᭛΀͵Η LL ;晉ᜋ͢΀͚ϹϦϸͽ墋㶨΁πЄϖΨ䨗͚ͼ手ͯ
    ͩ;͢ͽͣΡ΄ͽφμϷϤϕఽ憝ͽπЄϖΨ䨗ͥͩ;͢਻ฃ
    • ل樄ͯΡ;ͣΘμϺφπЀϞαϸ͢਻ฃ΀΄ͽϝαϗϷΨኞ
    ౮ͭͼ晒୮΀䁰ಅ΁ίϐϤͭͼͧ͠ΆΞ͚
    

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14. πϫЀϖ϶αЀϑЄϸ;ͭͼΕ͵ Go (2)
    • ڥአᘏ͡ΟͯΡ;
    • ϚϐϕϼЄμ΄᭛ଶ͢ค΁ྲΏͼݻӤͭͼ͚Ρͭϔΰφμς
    αχΘ䃀͞ͼ͚Ρ΄ͽහ܈MB΄ϝαϗϷΨύγЀϺЄϖͯΡ
    ΄΅֜΄㺔氂Θ΀͚
    • φμϷϤϕ᥺承;晅͚϶Ѐόαϭ͢஠ᥝ΀͚΄ͽϝαϗϷΨ
    ϪЀ;ͥ͠Ͷͧͽֵ͞ͼ׎ڥ
    

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15. Ӥ懿΄Ξ͜΀ቘኧ΀Ϳͽ匍դͽ͚Σ͚Σ΀
    ఺ޱͽֵ͚Κ͚ͯ᥺承Ͷ;ఽͮΡ
    

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16. ΑΩ;΅ၞᤈ͹ͼΡ͡ΟΚ͹ͼΕt
    

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17. ΅͚
    

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18. ίυδЀύ
    • ΀Ͳ Go ͡
    • Perl Monger ͢ Golang ΨতΗΞ͜͹ͼ䦒΁Ϝϫ͹͵;ͩΣ
    • Go ΄᥺承՛䯭ͽ਍Ό Perl ;΄ፘ晅ᅩ
    • Go ͽ๋ṛ΄ Web API Ψ֢͹ͼΕΞ͜Ѻ
    • Go ͽ͚͚ے仂ϓφϕΨ䨗ͥʹѺ
    • ͚͚ఽͮ΁ϠϸϖͭͼϷϷЄφͯΡʹѺ
    • Δ;Η
    

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19. Perl Monger ͢ Golang ΨতΗΞ͜͹ͼ䦒
    ΁Ϝϫ͹͵;ͩΣ
    • ίυδЀύ
    • CPAN ͢΀͚
    • $GOPATH ͡Οᭈ΢Ο΢΀͚
    • ϶αϣ϶Ϸ΄ᓕቘොဩ͢ΖͰ͚
    • ηЄςϷЀνϑЄϸ͢΀͚
    

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20. CPAN͢΀͚ (1)
    • Go ΅ git repository ΄ URL Ψ೰ਧͭͼαЀφϕЄϸͯΡ
    • CPAN Κ Ruby gems Κ npm ΄Ξ͜΀Ӿ।ᵞ䰱ጱςЄϝЄ͢
    ΀͚
    • Ӟͺ΄;ͩΣ΁Δ;Δ͹ͼ΀͚΄ͽ͚ͩͩ͜͜;ͭ͵͚ͧͿ
    ΀΁͚͚͡϶αϣ϶Ϸ΀͚͡΀뺶;റͯ΄͢ࢯ櫞
    

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21. CPAN͢΀͚ (2)
    • ϶αϣ϶ϷΨറͯ;ͣ΅
    • github.com ͽ golang + hogehoge ͯΡ
    • Έ͵ͯΟννΡ
    • ํ挷ᘏ΁守ͥ
    • etc…
    

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22. CPAN΁ၺ͡͹ͼኞͣͼͣ͵΄ͽͺΟ͚
    

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23. ❗ͩͩͽ๔䁭ѺѺ
    

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24. ๔䁭
    • https://blog.golang.org/modules2019
    • ਖ਼๶ጱ΁ҁ2019ଙӾҘ҂΁ Module Indexer Ψ֢ΡԨਧΟͭ
    ͚ѺѺΚ͹͵΃ѺѺ
    • Ք஍ CPAN Testers ጱ΀Θ΄Θͽͣͼ͚ͣͳ͜΀䶲ͯ͢Ρҁ㮆
    Ոጱ΀Ԩమͽͯ҂
    

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25. ๔䁭
    • ϶αϣ϶Ϸ΄ύγЀϺЄϖ΄ mirror Θ֢౮Ԩਧ;΄ͩ;
    • ͩ΢΅ Go 1.13 ͽ䌏䖕ͯΡΕ͵͚΀΄ͽ 2019.8 ΁΅ϷϷЄ
    φͫ΢Ρ͹Γ͚Ҙ
    • ֺ͞Ά github.com ៧ͷͼΘ mirror ͡ΟύγЀϺЄϖͽͣΡ
    Ξ͜΁;͚ͩ͜;Ο͚ͭ
    

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26. minicpan ͽ CPAN mirror 䯤塈ͭͼ
    䶅෭ cron ͽ ๅෛͭͼ͚͵෭̸Ψ௏͚ڊͭ
    Δͯ΃
    

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27. $GOPATH ͡Οᭈ΢Ο΢΀͚ (1)
    • golang ͽ΄樄咲΅ଉ΁ $GOPATH ΄ӥͽᤈ͜஠ᥝ͘͢Ρ
    • ͘ΟΜΡ϶αϣ϶Ϸ͢ $GOPATH ΄ӥ΁ᗝ͡΢Ρڹ൉΁΀͹ͼ
    ͚ͼ͡ͺ $GOPATH ΄ᯈӥͽ樄咲ᤈΥ΀͚;ᶎׯ΀ͩ;΁΀Ρ
    

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28. $GOPATH ͡Οᭈ΢Ο΢΀͚ (2)
    • Go 1.8 զᴳͽ΅ $GOPATH ΅ϔϢζϸϕͽ $HOME/go ΁΀͹
    ͼ͚Ρ
    • ͷΝ͹;;͹ͺͣΚͯͥ΀͹͵
    

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29. $GOPATH ͡Οᭈ΢Ο΢΀͚ (3)
    • Go 1.12 ͽفΡ go mod ͽ $GOPATH Ψ䶲΁ͭ΀ͥͼΘΞͥ΀ΡΟ͚ͭ…͢
    • ͚ΔΔͽل樄ͫ΢ͼͣ͵͘ΟΜΡϯυϲЄϸ͢ semver ΁䌏䖕ͯΡ஠ᥝ͘͢Ρ
    • go mod ͽΘϯυϲЄϸ΄κϰϐτϲ΀Ϳ΅ $GOPATH ᯈӥ΁֢Ο΢Ρ΄ͽ
    ਠق΁䶲΁ͭ΀ͥͼΞͥ΀ΡΥͧͽ΅΀ͫͳ͜
    • ͳΘͳΘ $GOPATH ΄ᯈӥͽͰ͹;Κ͹ͼͣ͵͡Ο嬹䙼Ψ䄜͞Ρ΄΅䦒樌͢
    ͡͡Πͳ͜
    • Go 1.12 ΅ 2019.2 ΁ϷϷЄφԨਧѺҁΘͯͦ͜ͽͯ΃ѺѺ҂
    

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30. ϶αϣ϶Ϸ΄ᓕቘොဩ͢ΖͰ͚ (1)
    • ϶αϣ϶Ϸ΄αЀφϕЄϸ΅ go get πϫЀϖΨֵ͜
    • go get -u github.com/motemen/gore ΄Ξ͜΀୵ୗͽׁਂ樛㭚ΘތΗͼαЀφ
    ϕЄϸͭͼͥ΢Ρ
    • $GOPATH/src ΁ΘΣΘΣ git clone ͫ΢ͼϠϸϖ͢ᩳΡ
    • Քࢧ΄ξЄφͶ; $GOPATH/src/github.com/motemen/gore ΀Ϳ
    • πϫЀϖ϶αЀϑЄϸΘ $GOPATH/bin ΁ϠϸϖͭͼαЀφϕЄϸͭͼͥ΢Ρ
    • perl ͽ cpanm install Foo::Bar ͯΡ΄;Ͷ͚͵͚Ӟ姼
    

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32. ϶αϣ϶Ϸ΄ᓕቘොဩ͢ΖͰ͚ (2)
    • go get ͽαЀφϕЄϸͫ΢Ρ΄΅ git repository ΄ master ΄
    HEADѺ
    • 䋚檭΅ go1 ;͚͜ branch or tag ͘͢΢Άͳ΢Ψ憎ΡͧͿΑ
    Βၺ᭐ͭͼ͚΀͚ཛྷ䯭
    • master ͢ stable ͡Ϳ͜͡΅Υ͡ΟΩ΄ͽ΀͡΀͡㷗͚ͭΘ΄
    ͘͢Ρ
    

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33. ϶αϣ϶Ϸ΄ᓕቘොဩ͢ΖͰ͚ (3)
    • go get ͽ΅ version Ψ೰ਧͭͼݐ஑ͯΡͩ;͢ͽͣ΀͚
    • ͳΘͳΘ version ᓕቘͫ΢ͼ͚ΡϯυϲЄϸ͢੝΀͚ѺѺ
    • Go 1.12 ͽفΡ go mod ΁ΞΠ semver Ψֵ͜Ξ͜΁΀Ρ΄
    ͽϮЀϓͫ΢ͼ͚Ρ϶αϣ϶Ϸ΁΅ၺ᭐ͭͼ͚͹ͼ΅͚Ρ
    

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34. ;΅͚͞
    

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35. WebίϤϷξЄτϴЀ΀ͿΨ䨗ͥ䁰ݳ΅
    go get Ψፗളֵͩ͜;΅च๜ጱ΁΅΀͚
    

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36. WebίϤϷξЄτϴЀΨ䨗ͥ;ͣ΄϶αϣ
    ϶Ϸ΄ᓕቘ (1)
    • Carton Κ bundler ΄Ξ͜΀̵ϤϺυδμϕᯈӥ΁஠ᥝ΀ϯυϲЄ
    ϸΨϝЄυϴЀࢴਧͭͼαЀφϕЄϸͯΡ՛奲ΕΨֵͩ͜;͢Α
    ;ΩͿ
    • go get Ψֵ͜΄΅ᇙਧ΄ϯυϲЄϸ΄䞉㵕Ψ抠Ώ͵͚;̵͡π
    ϫЀϖֵ͚͵͚;͡͹ͼ䁰ݳ͢Α;ΩͿ
    • ͭͭ͡ vendoring / glide / dep / vgo / go mod ;͚Σ͚Σ͘͹ͼ
    奾ੴͿ΢ֵ͞Ά͚͚΄Ҙ;΀Ρ
    

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37. WebίϤϷξЄτϴЀΨ䨗ͥ;ͣ΄϶αϣ
    ϶Ϸ΄ᓕቘ (2)
    • ୮ᶎ΅ glide / dep / go mod Ψֵ͚ړͧͼ͚ͥ஠ᥝ͘͢Ρ;௏Υ΢Ρ
    • glide / dep ΅ֵΥ΢ͼ͚ΡϤϺυδμϕ͢ग̵़ͥΑΒΑΒ๗இ᭗Π΁㵕
    ͥ΄ͽ㪥Π䟵͞ΡϯώϦЄτϴЀ֗͢ͳ͜
    • vgo ΅ go mod ;ͭͼ Go ΁ݐΠ旿Δ΢͵΄ͽ஫΢ͼᜉ͚
    • Go 1.12 ͡Ο΅ go mod Ψֵ͹ͼ͚ͥͩ;΁΀Ρ΅Ͱ
    • 匍ࣁ΄ Go 1.11 ͽ΅ $GO111MODULE =on ΁ͭͼͥ͠;͠手ͭͽͣΡ
    

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38. ;͚͜Υͧͽ
    ΔͶΔͶͩ΀΢ͼ΀͚᮱ړ͘͢Ρఽͮ
    

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39. ηЄςϷЀνϑЄϸ͢΀͚ (1)
    • Go ΁΅ηЄςϷЀνϑЄϸ΄䷥ਧᇇ΄Ξ͜΀Θ΄͢΀͚
    • Δ͹ͫΟ΀य़ࣈ͡ΟতΗΡͩ;΁΀Ρ
    • go xxx πϫЀϖΨ;΁ͥ͡಑ͺ͡ Makefile Ψ;΁ͥ͡䨗ͥͩ;΁΀Ρ
    • Ϡϸϖ͢ͳͩΔͽ櫞ͭͥ΀͚΄ͽ̵ͳΩ΀΁ࢯΟ΀͚;͚͞ΆࢯΟ΀͚͢…
    • ϷϷЄφ䦒΁ tag ಑͹͵Π̵Ϡϸϖͭ͵ϝαϗϷ΁ version ईΗ旿ΩͶΠ΀Ϳਧࣳ
    ΄㳌ቘ΅ generate ͭ͵͚ཿ
    • ;ͥ΁ go mod ΁ΞΠ϶αϣ϶Ϸ΄ϝЄυϴЀᓕቘ͢᯿ᥝ΁΀͹ͼ͚ͥ
    

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40. ηЄςϷЀνϑЄϸ͢΀͚ (2)
    • ౯̸΅ Minilla Κ ExtUtils::MakeMakerҁݘ͚҂ ΁䙼΢ͯͤͼ
    ͭΔ͹͵ΩΚ…
    • go mod Θֵ͞ΡΞ͜΁΀Ρ̵ͭΒͷΒͷͩ΄旽΄ϑЄϸΘڊ
    ͼͣͼΘ͚͚殹΀䶲΅ͯΡ
    

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41. ഄΠᬬ͹ͼΕΡ;ΘΣΘΣ϶αϣ϶Ϸ΄䜷
    ͚;͡ͽϜϫ͹ͼ͚͵
    

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42. ͭ͡ΘՔ஍Θ䄜Υ͹ͼ͚ͥ΄ͽ͘͹͵
    

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43. ΅͚
    

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44. ίυδЀύ
    • ΀Ͳ Go ͡
    • Perl Monger ͢ Golang ΨতΗΞ͜͹ͼ䦒΁Ϝϫ͹͵;ͩΣ
    • Go ΄᥺承՛䯭ͽ਍Ό Perl ;΄ፘ晅ᅩ
    • Web API Ψ֢͹ͼΕΞ͜
    • ϓφϕΨ䨗ͥ
    • Docker Ϡϸϖͭͼ㵕ͯ͡
    • Δ;Η
    

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45. Go ΄᥺承՛䯭ͽ਍Ό Perl ;΄ፘ晅ᅩ
    • ίυδЀύ (1)
    • 䄜හ;ࣳ΁ͺ͚ͼ
    • 樛හ΁ͺ͚ͼ
    • ε϶ЄϜЀϖϷЀν΁ͺ͚ͼ
    • defer ΁ͺ͚ͼ
    • gorutine ΁ͺ͚ͼ
    • context.Context ΁ͺ͚ͼ
    • package ΁ͺ͚ͼ
    

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46. Go ΄᥺承՛䯭ͽ਍Ό Perl ;΄ፘ晅ᅩ
    • ίυδЀύ (2)
    • ګக䯤෈΁ͺ͚ͼҁif / for / while / switch҂
    • goto ΁ͺ͚ͼ
    • Struct ΁ͺ͚ͼ
    • interface ΁ͺ͚ͼ
    • code formatter ΁ͺ͚ͼ
    • linter ΁ͺ͚ͼ
    

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47. 䄜හ;ࣳ΁ͺ͚ͼ (1)
    • 䄜හ΅ calemCase ͽਧ嬝ͯΡ
    • 䄜හ΁΅ࣳ͘͢Π̵Ӟଶਧ嬝ͫ΢͵Ο㳨΄ࣳ΅դفͽͣ΀͚
    • ᯈڜ;φ϶αφ;͚༷͜ஷ͘͢͹ͼፗఽጱ΁ቘᥴͭͻΟ͚͢च
    ๜ጱ΁΅φ϶αφֵͭ͡Υ΀͚΄ͽ䶲΁ͭ΀ͥͼᜉ͚
    • φ϶αφ΅ͬ͹ͥΠ͚͜;ݢ䄜槱΄ᯈڜΕ͵͚΀Θ΄
    

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49. 䄜හ;ࣳ΁ͺ͚ͼ (2)
    • Perl ΅ٖ᮱ጱ΁ࣳఘ䁭ΨΘ͹ͼ͚Ρ͢΀ΩͽΘϣώ旿ΗΡ
    • Scalar::Util::dualvar ΀ͿΨֵ͞ΆӞͺ΄䄜හͽ愢හ΄ࣳ΄㳨
    ΄㮔ΨΌͷ旿Ζͩ;Θݢᚆͽ͚ͯͪ
    • Go ΅ᶉጱࣳ՞ͧ᥺承΀΄ͽࣳ͢͡͹ͷΠͭͼ͚Ρ̵͢ग़ͥ΄
    䁰ݳͽࣳΨ䨗͚ͼࢧΟ΀ͥͼΘπЀϞα϶͢Ξͭ΀΁ͭͼͥ΢
    Ρ
    

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50. 樛හ΁ͺ͚ͼ (1)
    • 樛හ΅ func (୚හ) 䜟Π㮔 { … } ;͚͜୵ୗͽ懿ᬿͯΡ
    • 樛හݷ΅ PascalCase ͽ䨗ͥ; public ;΀Π camelCase ͽ䨗ͥ
    ; private ΁΀Ρ
    • ݢ䄜槱୚හΨݑͧ՞ͧΡͩ;ΘͽͣΡ
    

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52. 樛හ΁ͺ͚ͼ (2)
    • 樛හ΅愢හ΄㮔Ψᬬͯͩ;ΘͽͣΡ
    • Perl ͹Γ͚ͽͯ΃Ѻ
    • 樛හ΅䄜හ΁դف̵ͭ՜΄樛හ΁Ⴡͯͩ;ΘͽͣΡ
    • ΘͷΣΩ僻ݷ樛හΘ֢΢Ρ
    

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54. 樛හ΁ͺ͚ͼ (3)
    • Perl ͽ΅樛හϷϢήϹЀφΨ䄜හ΁ف΢ͼჁͯͩ;ΘͽͣΡͧ
    Ϳ go ΅Ϳ͹ͷ͡;͚͜; JavaScript ͹Γ͚ఽͮ
    • ͵Ͷ̵ͭ樛හΨ୚හ΁ͭ͵Π䜟Π㮔΁ͯΡ䁰ݳ΁τνϚώϰЄ
    Ψق᮱䨗ͥ஠ᥝ͘͢Ρ
    

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55. ε϶ЄϜЀϖϷЀν (1)
    • go ΅ perl ;ݶͮͽ throw exception Κ try / cache ΄Ξ͜΀ֺक़䱛䯤
    ͢΀͚
    • ֺक़Ψڊͯ䁰ݳ΅ panic() Ψֵ͜
    • perl ͽ΅͠΀ͮΕ΄ die ͽͯ΃Ѻ
    • panic() ΨκϰϐώͯΡ΄΅ defer func () { recover() } Ψֵ͜;ͽͣΡ
    • perl ͽ΅͠΀ͮΕ΄ eval ͽͯ΃Ѻ
    

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56. View Slide

57. ̵ͭͭ͡᭗ଉ΅ panic() Ψֵͩ͜;΅വ䅏
    ͫ΢ͼ͚ΔͱΩѺѺ
    

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58. ε϶ЄϜЀϖϷЀν (2)
    • ᛘ޸ጱ΀ε϶ЄͽϤϺψφΨ奰ԧͭ΀ͧ΢Ά΀Ο΀͚䦒΁ᴴ͹
    ͼֵ͜Ώͣ
    • ͭ͵͢͹ͼ recover() ΄ڊኾΘᛔͰ;Α;ΩͿ΀͚
    • WebίϤϷξЄτϴЀ΀Ϳͽ΅΂ΡΓΚOutOfIndexጱ΀Θ΄
    ͽ϶Ѐόαϭε϶Єͽ panic() ͢咲ኞͯΡݢᚆ௔΅͘Ρ΄ͽϷ
    μεφϕ΄Ӟኾक़㯎ͽ recover() ͯΡͦΟ͚
    

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59. ε϶ЄϜЀϖϷЀν (3)
    • go ͽ΅ε϶Є㮔Ψ䜟Π㮔ͽᬬͯͩ;͢വ䅏ͫ΢ͼ͚Ρ
    • ڹᬿͭ͵Ξ͜΁ go ΄樛හ΅䜟Π㮔Ψ愢හᬬͯͩ;͢ͽ̵ͣच
    ๜ጱ΁΅๋஍΄䜟Π㮔͢ error αЀόЄϢδЄφΔ͵΅ bool
    ΁΀ΡΞ͜΁ͯΡ
    • αЀόЄϢδЄφ΁ͺ͚ͼ΅஍ᬿͭΔͯ
    

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60. View Slide

61. ͩΩ΀ఽͮͽ樛හ΅ग़ͥ΄ξЄφͽ error
    ΨᬬͯΞ͜΁΀͹ͼ͚Ρ΄ͽ晒ڔ΁㳌ቘͯ
    Ρ஠ᥝ͘͢ΠΔͯ
    

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62. defer ΁ͺ͚ͼ (1)
    • defer func() ͯΡ;匍ࣁ΄樛හ͡Ο䝏ͧΡ䦒΁ func() Ψ䋚ᤈͯΡ
    • Perl ͽ᥺͜ Scope::Guard ΁֒ͼ͚Ρ
    • go ΄ defer ; Scope::Guard ΄晅͚
    • 䜟Π㮔͢΀͚΄ͽ̵Scope::Guard ΄ dismiss ΄Ξ͜΀ͩ;΅ͽͣ΀͚
    • φπЄϤΨ䝏ͧ͵䦒ͽ΅΀̵ͥͥ͘ΔͽΘ樛හΨ䝏ͧ͵䦒΁ͭ͡咲㵕ͭ΀͚
    • If Κ for ΄Ӿͽ defer Ψ䨗ͥ΄΅఺㾩ͭ͵䞉㵕;΀Ο΀͚ݢᚆ௔͢ṛ͚΄ͽဳ఺
    

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63. View Slide

64. defer ΁ͺ͚ͼ (2)
    • 䋚΅Ӥ懿΄πЄϖ΅ε϶ЄΨൎΠͺΌͭͼ͚Ρ
    • file.Close() ΅ε϶ЄΨᬬͯͩ;͘͢Ρ
    • ͷΙΩ;ϜЀϖϷЀνͭ΀͚;͘͡Ωͽͯ
    

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66. defer ΁ͺ͚ͼ (3)
    • ͫΟ΁̵defer ͽ咲ኞͭ͵ε϶ЄΨ樛හ΄䜟Π㮔;ͭͼᬬͭ͵
    䁰ݳ΅Ӟૡॢ஠ᥝ΁΀Ρ
    • 樛හ΁ε϶Є͘͢Ρ͡Ϳ͜͡ͷΙΩ;嘦扯ͭͼ䶲Ψͺͧͼֵ͜
    ஠ᥝ͘͢Ρ
    

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67. gorutine ΁ͺ͚ͼ
    • Go Ψ᨝䖀ͯΡ䱛ᚆ
    • `go func()` ͯΡͶͧͽ̵㳨φϹϐϖͽ㳌ቘ͢ᩳΡ΄ͽ㪔ڜϤϺ
    ν϶ϬЀν͢墋㶨΁ͽͣͼͭΔ͜
    • gorutine ݶॊ΄ΚΠ;Π΅ channel Ψֵͩ͜;ͽᤈ͜
    • Perl ͽ͚͜ AnyEvent Κ Coro ;༷ஷ΅ΑΒӞ姼ͽͯ΃
    

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68. context.Context ΁ͺ͚ͼ
    • ᇙਧ΄ gorutine Κ Ӟ昧΄㳌ቘ΄Ӿͽձ఺΄ϔЄόΨف΢ͼ୚ͣࢧͭ͵
    Π̵κϰЀψϸ㳌ቘΨူ݊ͫͱΡ͵Η΀Ϳ΁ڥአͯΡ
    • Perl ΄ Amon2 Κ Catalyst (䛖͚ͭ͡) ΀Ϳ΄ $c ;֒͵Ξ͜΀༷ஷ
    • go ΄䁰ݳ΅ core ΁ف͹ͼ͚Ρ͵Η̵͚Σ͚Σ΀ϯυϲЄϸͽݶͮ API Ψ
    ڥአͯΡͩ;͢ͽͣΡ΄ͽΗͷΙͥͷΙֵΥ΢ͼ͚Ρ
    • ᇙ΁WebίϤϷξЄτϴЀΨ֢ΡӤͽ΅ όαϭίγϕΚٖ᮱ε϶Єͽ㳌
    ቘΨκϰЀψϸͭ͵͚䦒΀Ϳ΁஠殾΄䱛ᚆͽ;΁ͥ͡୚ͣࢧͯͩ;΁΀Ρ
    

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69. pacakge ΁ͺ͚ͼ (1)
    • go ͽϯυϲЄϸΨαЀϪЄϕͯΡ䁰ݳ΅
    • core ΄䁰ݳ΅ net/http ΄Ξ͜΁ͯΡ
    • ͳ͜ͽ΀͚䁰ݳ΅ github.com/jmoiron/sqlx ΄Ξ͜΁ͯΡ
    

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70. pacakge ΁ͺ͚ͼ (2)
    • net/http Ψֵ͜䁰ݳ΅ http.Get(“…”) ΄Ξ͜΁ http Ψ prefix ;
    ͭͼֵ͜
    • net/http ΨαЀϪЄϕͭͼ͚ΡΞϢήαϸͽΘͭ github.com/
    xaicron/http ΄Ξ͜΀ package ΨαЀϪЄϕͭΞ͜;ͯΡ;
    http ΄ prefix ͢ᤩ͹ͼͭΔ͜
    • ͳ΄䁰ݳ΅αЀϪЄϕ;ͣ΁㳨ݷΨͺͧΡͩ;͢ͽͣΡ
    

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71. View Slide

72. pacakge ΁ͺ͚ͼ (3)
    • package ΄φπЄϤ΁ͺ͚ͼ
    • sqlx ΄ϔΰϹμϕϷ䯤౮Ψ憎ͼΕΡ;̵Α;ΩͿ΄Ϣήαϸ
    ͢Ϣ϶ϐϕ΁ᗝ͡΢ͼ͚Ρ΄͢Υ͡Ρ
    • named.go ΀ͿΨΈΟͥ; package sqlx ;΀͹ͼ͚Ρ΄͢Υ
    ͡Ρ
    

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73. pacakge ΁ͺ͚ͼ (4)
    • Perl ΄䁰ݳ΅ `ϔΰϹμϕϷ::Ϣήαϸݷ` ͢ package ݷͶ͢晅͜
    • Go ΄䁰ݳ΅φπЄϤ΄塅㾨͢ package ΀΄ͽݶͮϔΰϹμϕ
    Ϸ΁͘Ρ *.go Ϣήαϸ΅قͼݶͮφπЄϤͽ͘Ρ
    • Perl ΅ϢήαϸφπЄϤ
    • Go ΄ϊЄφ΅ݶͮϔΰϹμϕϷ΄Ϣήαϸ΁㳌ቘ͢ړවͭͼ
    ͚Ρ΄͢ฦ᭗
    

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74. ϞϐξЄυ΄䜷͚͢ Perl ;΅奾䯤晅͜΄ͽ
    䶲ΨͺͧΡ஠ᥝ͘͢Ρ
    

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75. ګக䯤෈΁ͺ͚ͼ (1)
    • If ΁ͺ͚ͼ
    • if ΁ೡୢ΅஠ᥝ΀ͭ
    • elseif ͽ΅΀ͥ else if
    • ӣ殻ᄍᓒৼ͢ਂࣁͭ΀͚͵Η̵ͺ΃΁ if ~ else Ψ䨗ͥ஠ᥝ͢
    ͘Ρ
    

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76. ګக䯤෈΁ͺ͚ͼ (2)
    • for ΁ͺ͚ͼ
    • for ΁Θೡୢ΅஠ᥝ΀ͭ
    • for ΄Ӿͽ΅ break ; continue ֵ͢͞Ρ
    • foreach 䯤෈΅΀͚͢դΥΠ΁ for … := range var { … } 䯤෈
    ֵ͢͞Ρ
    

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78. while ΁ͺ͚ͼ
    • while ΀Ϳ;͚͹͵揞୧΀Θ΄΅΀͚ѺѺ
    • for ΄๵կ෈Ψ΀ͥͱΆ while ΁΀Ρ΄ͽ㺔氂΀ͭ
    • for n < 100 { n++ } ΄Ξ͜΀ఽͮ
    

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79. switch ΁ͺ͚ͼ
    • 䘂ݷṛͣ switch ෈ͽ̵ͯ͢go ͽ΅Ξֵ͚ͥΔͯ
    • case ΄͘;΁ break Ψ䨗ͥ஠ᥝ͢΀͚΄ͽ఺㾩ͱͰེ΄ case
    ΁ᤈ͹ͼͭΔ͜;͚͜ϝν᩸ͩ͢Π΁͚ͥ
    • ེ΄ case ΁ᤈͣ͵͚䁰ݳ΅กᐏጱ΁ fallthrough Ψ䨗ͥ஠ᥝ
    ͘͢Ρ
    

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80. View Slide

81. goto ΁ͺ͚ͼ
    • go ΁΅ goto ͘͢ΡѺΚ͹͵΃ѺѺ
    • goto ͢΀͚᥺承΅㷗͚ͭ͡Οͩ΢΅๋ṛͽͯ΃ (e.g. parser Ψ
    䨗ͥ䦒΀Ϳ)
    

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82. Struct ΁ͺ͚ͼ
    • ᥺ΥͰ;Ꭳ΢͵䯤᭜֛
    • Struct ΁͵͚ͭͼ̵ϮϊϐϖΨኞΚͯͩ;͢ͽͣΡ΄ͽͩ΢͢
    ΀͚;তΔΟ΀͚
    • Perl ΄ηϣυδμϕ͹Γ͚Θ΄
    • 抍กͭڊͯ;奰ΥΟ΀͚΄ͽ托奞΅፜ͣΔͯ
    

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83. interface ΁ͺ͚ͼ
    • Interface ΁΅伋͵ͯΏͣ樛හ΄ਧ嬝Ψ䨗ͣΔͯ
    • go ΄ interface ΅ Java ;晅͹ͼกᐏጱ΁μ϶φҁGo ͽ΅ Struct҂΁奄ͻͣΔͱΩ
    • Struct ΄ො΁ interface ͢伋͵ͯΏͣϮϊϐϖΨͯΏͼ䋚ᤰͭ͵;ͣ΁̵interfcae
    Ψ䋚ᤰͭ͵;͚͜ᇫ丆΁΀ΠΔͯ
    • Interface ΁͘ΔΠ΁Θग़ͥ΄ਧ嬝Ψ䨗͚ͼͭΔ͜;䋚ᤰͯΡ㯎͢य़䄜΀͵Η̵ग़
    ͥ΄䁰ݳ interface ΁΅1뺶හ㮆ᑕଶͭ͡䨗͡΢ΔͱΩ
    • 抍กͭڊͯ;奰ΥΟ΀͚΄ͽ托奞΅፜ͣΔͯ
    

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84. code formatter ΁ͺ͚ͼ (1)
    • go ΅ϔϢζϸϕͽ go fmt ;͚͜πϫЀϖ͘͢Ρ΄ͽͩ΢Ψֵ
    ͩ͜;ͽπЄϖΨෆ୵ͯΡͩ;͢ͽͣΡ
    • go ͽ΅ go fmt Ψ᭗ͯͩ;͢୮͵Πڹ΁΀͹ͼ͚Ρ͵Η̵πЄ
    ϔΰЀνφόαϸ΅قӮኴو᭗
    • perl ͽ΅ perltidy Κ App::PRT ΀Ϳ͘͢ΠΔͯ΃Ѻ
    

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85. code formatter ΁ͺ͚ͼ (2)
    • perl ΄䁰ݳ΅̵parser ΅ C ͽ䨗͡΢ͼ͠Π͡ͺ㵕ጱ΁ AST Ψ
    䯤塈ͯΡ͵Ηᶉጱᥴຉͽ΅ᴴኴ͘͢͹͵ΠͭΔ̵ͯ͢go ͽ΅
    ͳΘͳΘπЀϞαϸ᥺承ͽ͘Ρ͵Ηͩ΄旽Π΅䜷͚Κͯͥ΀ͼ
    ͚Ρ
    • perl ͽΘ PPI Κ Compiler::LexerΚ Compiler::Parser Ψֵ͞Ά
    ͡΀Π΄ϹϦϸͽᶉጱᥴຉ΅ݢᚆͽͯ͢ਠኃ΁ΚΡ΄΅΀͡΀
    ͡櫞͚ͭͽͯ΃
    

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86. code formatter ΁ͺ͚ͼ (3)
    • go fmt ΨΘ;΁ͭ͵ go import Κ go returns ΀Ϳ΄ϑЄϸΘ
    ͘Ρ
    • च๜ጱ΁΅πЄϖ᮱ړ΄ෆ୵΅Ӟ姼ͽ̵import ΄ෆ୵ϸЄϸ
    ͢ͷΝ͹;晅͹͵Π return ෈Ψ愆ਠͭͼͥ΢͵ΠͯΡ
    • य़ͣͥ䄜ΥΟ΀͚΄ͽϤϺυδμϕ㶨֖ͽֵ͜Θ΄Ψࢴਧͯ
    ΢Ά㺔氂΀ͭ
    

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87. linter ΁ͺ͚ͼ
    • go ΅ᶉጱᥴຉ͢ go ᛔ֛ͽΚΠΚ͚ͯ͵Η̵linter Θ꧌䋚ͭͼ͚Δͯ
    • 䰤伛πϫЀϖ;ͭͼ͘Ρ go vet ΚςЄϖϞЄϓΰ΄ go lint ΅๋֗ᴴֵ͜;͚͚ͽ
    ͭΝ͜
    • go vet ΅πЀϞαϸε϶Є΁΅΀Ο΀͚ͧͿϮϯϷϷЄμ΀ͿͫΔͬΔ΀㺔氂΁΀
    Πͳ͜΀πЄϖΨර͞ͼͥ΢Δͯ
    • go lint ΅ΞΠΞ͚πЄϔΰЀνφόαϸΨ suggest ͭͼͥ΢Δͯ
    • ͫΟ΁ͣΗ奞͡΀ώδϐμΨᤈ͚͵͚䁰ݳ΅ https://github.com/dominikh/go-tools
    Ψ手ͯͩ;ΘͽͣΔͯ
    

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88. formatter Θ linter Θᛔړͽ͚ͷ͚ͷπϫ
    ЀϖΨݜͥ΄ͽ΅΀ͥ Editer ΁戔ਧͯΡͩ
    ;͢਻ฃ΀΄ͽͳ΄Ξ͜΁ͭΔͭΝ͜
    

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89. ΅͚
    

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90. ίυδЀύ
    • ΀Ͳ Go ͡
    • Perl Monger ͢ Golang ΨতΗΞ͜͹ͼ䦒΁Ϝϫ͹͵;ͩΣ
    • Go ΄᥺承՛䯭ͽ਍Ό Perl ;΄ፘ晅ᅩ
    • Web API Ψ֢͹ͼΕΞ͜
    • ϓφϕΨ䨗ͥ
    • Docker Ϡϸϖͭͼ㵕ͯ͡
    • Δ;Η
    

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91. Go ͽ๋ṛ΄ Web API Ψ֢͹ͼΕΞ͜Ѻ
    • ίυδЀύ
    • WebςЄϝЄΨᒈͼΡ
    • πЄϖ΄䄜ๅ͘͢͹͵Οܨଷ΁ϠϸϖͯΡ
    • Database ΁ίμψφͯΡ
    • Web API Ψ䨗͚ͼ͚ͥ
    

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92. WebςЄϝЄΨᒈͼΡ (1)
    • net/http Ψֵͩ͜;ͽ墋㶨΁ Web ςЄϝЄΨᒈͼΡͩ;͢ͽͣΡ
    • net/http ΅ςЄϝЄ΁Θμ϶αίЀϕ΁Θ΀Ρṛ䱛ᚆ΀϶αϣ϶ϷЄ
    • ςЄϝЄ΄䁰ݳ΅ٖ᮱ͽ㵛ಋ΁ gorutine Ψኞ౮ͭͼϷμεφϕ͢奰Υ͹͵
    ΟᏈ䬤ͭͼͥ΢Ρ΄ͽ΀΁Θᘍ͞Ͱ΁ϷϊЄφΨ㵁ሲጱ΁ֵͩ͜;͢ͽͣΡ
    • Graceful ShutdownΘ墋㶨΁䋚匍ͽͣΡ΄ͽΞ͚
    • HTTP/2 ΁Θ䌏䖕ͭͼ͚Ρ
    

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93. ͩͩ΁πЄϖΨ䨗ͥ
    

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94. WebςЄϝЄΨᒈͼͼΕΡ (2)
    • middleware ΁䌏䖕ͭͼΕΡ
    • Plack ΄ midleware ;ΑΒݶ༷ͮஷ΄Θ΄΀΄ͽ Plack Κ͹
    ͼ΢Ά䮭㵛ͽͯ
    • ͚ͺΘ΄όϫϚλ΄ኮ؟Ψ毣΁௏͚ၶ͡ΏͼͥͶ͚ͫ
    

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95. ͩͩ΁πЄϖΨ䨗ͥ
    

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96. WebςЄϝЄΨᒈͼͼΕΡ (3)
    • middleware Ψ䨗ͥ;ͣ΄ဳ఺ᅩ
    • http.responseWriter.WriteHeader() ͭ͵͘;΅ Header Ψ᭄ے
    ͯΡͩ;͢ͽͣ΀͚΄ͽ䶲ΨͺͧΡ஠ᥝ͘͢Ρ
    • ͵;͞Ά Content-Length Κ X-Frame-Open ΀Ϳ΄ Header Ψ
    middleware ΄஍㳌ቘͽ᭄ےͯΡͩ;͢ࢯ櫞
    • Ε΀ͫΩͿͭ͜ͼΔͯ͡ҘҘ
    

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97. Web ςЄϝЄΨᒈͼΡ (4)
    • Graceful Shutdown ΁䌏䖕ͯΡ
    • ςЄϝЄΨෛ͚ͭ gorutine ͽ᩸㵕ͭͼ̵main ͽ signal ϕ
    ϶ϐϤͯΡͩ;ͽ̵ྲ斃ጱ墋㶨΁䋚匍ͽͣΡ
    

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98. ͩͩ΁πЄϖΨ䨗ͥ
    

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99. net/http 墋㶨ͽͯ΃Ѻ
    

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100. 䄜ๅ͘͢͹͵Οܨଷ΁ϠϸϖͯΡ (1)
     • Ͷ͚͵̵͚ςЄϝЄΨ䨗͚ͼΡ䦒΅πЄϖΨ䨗ͣ䟵͞͵Οᛔ㵕
     ጱ΁Ϡϸϖ͢ᩳ͹ͼٚ᩸㵕ͭͼΑ͚ͭͽͯ΃
     • realize Ψֵ͜;墋㶨΁䋚匍ͽͣΔͯ
     • realize Ψ᩸㵕ͯΡ;ᛔ᫝΄ςЄϝЄΘᒈͷӤ͢͹ͼϢήαϸ
     ΄䄜ๅΚίμψφϺν͢憎Ο΢ͼ䮭͚ͭͽͯ΄ͽͲΈֵ͚Δ
     ͭΝ͜
     

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101. 䄜ๅ͘͢͹͵Οܨଷ΁ϠϸϖͯΡ (2)
     • go get github.com/oxequa/realize ͭͼ realize start ͯΡͶͧ
     ͽ *.go Ϣήαϸ΄哶憙Ψͭͼͥ΢Δͯ
     • 戔ਧϢήαϸ΅ڡࢧ᩸㵕䦒΁ .realize.yaml ΁ͺͥΟ΢Ρ΄ͽ̵
     ͘;΅奞ͥ͡抠ෆͭͼ͚ͣΔͭΝ͜
     

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102. Database ΁ίμψφͯΡ (1)
     • database/sql ΄αЀόЄϢδЄφΨ䋚ᤰͭ͵ driver Ψֵͩ͜;
     ͽ Database ΁ίμψφͽͣΔͯ
     • Perl ΄ DBI ΄Ξ͜΀Θ΄ͽϔϢήμϕ
     • Քࢧ΅ github.com/go-sql-driver/mysql Ψֵ͚Δͯ
     

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103. Database ΁ίμψφͯΡ (2)
     • go-sql-driver-mysql ΅ go ͽقͼ䨗͡΢ͼ͠Π̵libmysqlclient
     ΁ׁਂͭͼ͚΀͚
     • ͩ΢΁ΞΠಅ̸ libmysqlclient Ψֵ͹ͼ͚Ρग़ͥ΄᥺承;䞉
     㵕͢吖΀Ρ;ͩΣ͘͢ΠΔͯ
     

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104. Database ΁ίμψφͯΡ (3)
     • database/sql ΅πϚμτϴЀϤЄϷЀνΨᤈ͚Δͯ
     • ͜Δͥͺ͡͞ΆϞϢζЄϫЀφ͢ڊΡӞොͽϜϫΠͿͩΣΘ͘
     Ρ
     

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105. Database ΁ίμψφͯΡ (4)
     • πϚμτϴЀΨ揳ΠͯͤͼͭΔ͜㺔氂
     • Ϸμεφϕ͢ϝЄφϕͭ͵;ͣ΀Ϳͽ go ΄ concurrency ͢䃀य़ͭͼӞ
     䶲΁ mysql ΁πϚμτϴЀΨ揳͹ͼͭΔ͚ max_connection ΨηЄϝЄ
     ͭ͵ΠϷϊЄφΨ͚ᷣͺΌͭͼͭΔ͜ݢᚆ௔͘͢Ρ
     • Δ͵̵僻洏΁ idel ΄ള姆͢ྜ͹ͼͭΔ͜
     • DB.SetMaxIdleConns() ; DB.SetMaxOpenConns() ͽګகͯΡͩ;͢
     ͽͣΡͩ͢΄㮔΁΀΁Ψف΢΢Ά͚͚͡΅ίϤϷξЄτϴЀ΄ᥝկེᒫ
     

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106. Database ΁ίμψφͯΡ (5)
     • wait_timeout ΁୚͹͡͡Ρڹ΁ίϤϷξЄτϴЀ㯎͡ΟπϚμ
     τϴЀΨᏈ䬤ͭ͵͚
     • DB.SetConnMaxLifetime() ͽګகݢᚆ
     • wait_timeout ͭ͵Π֜Ο͡΄ቘኧͽ MySQL ͡ΟπϚμτϴЀ
     ͢ڔෙͫ΢͵䁰ݳ΅ίϤϷξЄτϴЀ͢ϷμεφϕΨᤈ͹ͼڡ
     Ηͼړ͡Ρ΄ͽͩͩ΄϶γЀϖϕϷϐϤΨಪ͞Ρ΄΁ํ㵁
     

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107. Database ΁ίμψφͯΡ (6)
     • Query() Κ Exec() ͽϤϹЄφϨϸύЄΨֵ͹͵䁰ݳ̵Prepare Statement ͢咲ᤈͫ΢ͼͭΔ͜
     • Prepare ΅πϚμτϴЀ㶨֖ͽٖ᮱ጱ΁κϰϐτϲͫ΢Ρ
     • ͭͭ͡ग़ͥ΄ WebίϤϷξЄτϴЀͽ΅䯭̸΀μεϷЄ͢咲ᤈͫ΢Ρ΄ͽϟϐϕሲ΅͡΀Π͚֗
     • Prepare Ψ咲ᤈͱͰ΁ϤϹЄφϨϸύЄΨ go ͽᗝ䟵ͯΡ΄͢অΔ͚ͭ
     • fmt.Sprintf() Ψֵ͜ොဩ͢ϖκϲϮЀϕͫ΢ͼ͚Ρ̵͢SQL Injection ͢ோ͚
     • MySQL ΄䁰ݳ̵Open䦒΄ params ΁ interpolateParams=true ΨͺͧΡͩ;ͽ driver ΄Ӿͽᗝ䟵
     Ψͭͼͥ΢Ρ΄ͽμεϷЄ΄咲ᤈහ͢仂Ρ
     • 托ͭͥ΅ http://dsas.blog.klab.org/archives/52191467.html
     

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108. Database ΁ίμψφͯΡ (7)
     • 䋚檭΁ϔЄόΨ SELECT ͭͼΕΔͭΝ͜
     • 1ϹπЄϖͶͧݐ஑ͭ͵͚䁰ݳ΅ DB.QueryRow(…).Scan(…) Ψ
     ͺ͚͡Δͯ
     • Scan() ΁΅ϪαЀόЄΨჁͯ஠ᥝ͘͢ΠΔͯ
     • go ΄୚හ΅㮔Ⴡͭ΀͵Η
     

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109. View Slide

110. Database ΁ίμψφͯΡ (8)
     • 愢හᤈݐ஑ͯΡ䦒΅ DB.Query(…) Ψֵ͚Δͯ
     • 䜟Π㮔΅αϓϹЄόЄ΁΀͹ͼ͚ͼ̵ͳ΢ʹ΢Ψ Scan() ͭͼ
     ͚ͥ୵
     • ε϶Є͢咲ኞͯΡ堞ಅ͢ग̵़ͥ奾䯤儴櫏΁΀ΠΔͯ
     

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112. Database ΁ίμψφͯΡ (9)
     • ϕ϶ЀσμτϴЀΨڥአͭͼ INSERT ͯΡ
     • ϕ϶ЀσμτϴЀΨڥአͯΡ䁰ݳ΅ DB.Begin() Ψ咲ᤈͭͼ Tx Ψݑͧݐ
     Ρ
     • ͩ΄ Tx Ψֵ͹ͼ Tx.Exec() Ψᤈͩ͜;ͽϕ϶ЀσμτϴЀ㳌ቘ΁΀Ρ
     • Tx ͽ΅΀ͥ DB.Exec() ͭ͵䁰ݳ΅ϕ϶ЀσμτϴЀ㳌ቘ΁΀Ο΀͚΄
     ͽဳ఺
     

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113. View Slide

114. ͚Σ͚Σ䨗͚ͼͣ͵ͧͿ
     ኞͽΚΡ΄奾䯤ͣͺ͚
     

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115. database/sql ΄϶ϐϞЄΨֵ͜
     • github.com/jmoiron/sqlx Ψֵ͜;̵DB.Get() Κ DB.Select() ͽ
     Struct ΁ϫϐϡЀνͭͼͥ΢Ρ̵ͭrows ΄ Close() ΀ͿΘ晒ڔ΁
     ᤈ͹ͼͥ΢Ρ
     • Struct ΁΅όνΨͺ͡͹ͼ `db:”column”` ΀Ϳ;䨗͚ͼ͚ͧΆ䌏䖕
     ͭͼͥ΢Ρ
     • sqlx ΅ database/sql ΄ͯΏͼ΄ل樄樛හΨ䋚ᤰͭͼ͚Ρ΄ͽ̵
     QueryRow() ΀ͿΘͳ΄ΔΔֵͩ͜;͢ͽͣΡ
     

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116. View Slide

117. View Slide

118. ͡΀ΠφϐκϷͭΔͭ͵΃ѺѺ
     

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119. ϕ϶ЀσμτϴЀ㳌ቘΨ䮭΁ͯΡ
     • github.com/Code-Hex/sqlx-transactionmanager Ψֵ͜;ϕ϶ЀσμτϴЀ
     㳌ቘ͢䮭΁΀ΠΔͯ
     • Perl ΄ DBIx::TransactionManager ΄Ξ͜΀Θ΄
     • Ϛφϕͭ͵ϕ϶ЀσμτϴЀΨ墋㶨΁䨗ͥͩ;͢ͽͣΡ
     • sqlx΄϶ϐϞЄ΁΀͹ͼ͚Ρ΄ͽͯΏͼ΄樛හ͢ڥአݢᚆ
     • ֵ͜䦒΅ tm ϞϐξЄυ΄ϕ϶ЀσμτϴЀϣϺϐμ΄ΕΨڥአͭ͵ො͢Ϝϫ
     Π΁͚ͥ
     

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120. View Slide

121. Ͷ͚Όͯ͹ͣΠѺ
     

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122. μεϷЄϠϸύЄΨֵ͜
     • Κ͹·Π IN ܄Ψᛔێͽ䨗ͥ΄΅ᬔ͚Θ΄͘͢Ρ΄ͽμεϷϠϸύЄΨ
     ֵ͚ΔͭΝ͜
     • ᛔړ΅ github.com/Masterminds/squirrel Ψֵ͹ͼ͚Δͯ
     • JOIN ΨތΖͶ͚͵͚΄ξЄφ΄μεϷЄ͢ኞ౮ͽͣΡ΄ͽ׎ڥ
     • Perl ΄ SQL::Maker ͹Γֵ͚͚ͪͩͷ
     • لୗϖκϲϮЀϕ΁ςЀϤϸ͢掓੄΀΄ͽֵ͚ො΅ͳͷΟ݇ᆙ΄ͩ;
     

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123. ͿΩ΀μεϷЄ͢咲ᤈͫ΢ͼ͚Ρ͡ᎣΡ
     • ίϤϷξЄτϴЀ͢य़ͣͥ΀͹ͼͥΡ;Ԩ๗ͱ΂μεϷЄ͢咲ኞͯΡͩ;͢Δ
     Δ͘ΠΔͯ
     • ͳΩ΀;ͣ΅咲ᤈͫ΢ͼ͚ΡμεϷЄΨԃ᥃΁ͭ͵͚ͽͯ΃
     • tcpdump Ψ;΢ΆΥ͡ΡͧͿ樄咲Ӿ΅櫏΁Ϻν΁ڊͭ͵͚
     • github.com/gchaincl/sqlhooks Ψֵ͞Ά墋㶨΁μεϷЄΨϺλЀνͽͣΔͯ
     • perl ͽ͚͜ Devel::KTYProf Κ DBI:x::QueryLog ΄Ξ͜΀Θ΄
     

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124. View Slide

125. ͫͼ
     

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126. ͩͩΔͽͣ͵Ο Web API Ψ
     ͪΠ͹;ͧ͡ͳ͜ͽͯ΃ѺѺ
     

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127. Web API Ψ䨗͚ͼ͚ͥ (1)
     • RESTful ͹Γ͚ JSON Ψᬬͯ API Ψ䨗͚ͼ͚ͥ
     • Twitter͹Γ͚ͷΝ͹;ͭ͵ϮϐψЄυΨಭᑤͽͣΡ API Ψ戔懯ͭΔͯ
     • POST /users
     • GET /users/{user_id}
     • POST /messages
     • GET /messages/{message_id}
     • Ε͵͚΀ఽͮ
     

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128. Web API Ψ䨗͚ͼ͚ͥ (1)
     • ᇙਧ΄ HTTP Method ͡ͺᇙਧ΄ path զक़Ύ΄ίμψφ΅ε϶Є΁ͭ
     ͵͚
     • {user_id} ΀ͿΨ͚͚ఽͮ΁઀樄ͭ͵͚
     • ;௏͚Δͯ΃
     • net/http ኞͽӤ懿Ψ伋͵ͯ΄΅΀͡΀͡ᬔ͚
     • HTTPϸЄόЄ΄ github.com/gorilla/mux Ψֵ͚ΔͭΝ͜
     

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129. View Slide

130. gollila/mux Ψֵ͞ΆͶ͚Ό
     φϐκϷͧ͡Δͯ΃
     

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131. negroni Ψֵ͜
     • net/http ኞͽ΅ HandlerFunc() ͪ;΁ middleware Ψ晒አͭͼ
     ͚͡΀ͥͼ΅΀ΟͰय़䄜ΗΩͿ͜΀΄ͽ negroni Ψֵ͚Δͯ
     • negroni Ψֵͩ͜;ͽ̵ᇙਧ΄ path ΁䌏ͭͼͶͧ middleware
     Ψ晒አͭ͵Π̵愢හ΄ middleware Ψق֛΁晒አͯΡͩ;͢
     φϐκϷ;ͧ͡ΡΞ͜΁΀ΠΔͯ
     

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132. Web API ΄䯤౮ (1)
     • Handler -> Service -> Repository ;͚͜Ξ͜΁㳌ቘ͢ၞ΢ΡΞ
     ͜΁䋚ᤰͭΔͯ
     • ݱ̸΅ interface ΨՕͭ͵ΚΠݐΠΨᤈ͜
     • ͚ͩ͜͜䯤౮Ψ;Ρͩ;ͽݱ䍅ͽ΄䱛ᚆ͢ړ櫝ͫ΢ϓφϕΘ䨗
     ͣΚͯͥ΀ΠΔͯ
     

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133. Web API ΄䯤౮ (2)
     • Handler
     • HTTP Request Ψݑͧ՞ͧͼϞ϶ϮЄό΄㳌ቘΨᤈ͚
     Service Ψ޷Ήڊͯ
     • Service ΁ HTTP 樛昧΄Θ΄΅Ⴡͫ΀͚
     

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134. Web API ΄䯤౮ (3)
     • Service
     • ϠυϚφϺυϐμΨ䨗ͥ;ͩΣ
     • ͳ΄ݷ΄᭗ΠςЄϠφ΄ᙋ
     

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135. Web API ΄䯤౮ (4)
     • Repository
     • ϔЄόϦЄφΚͳ΄՜΄φϕϹЄυΎ΄ίμψφΨ檱ᠰͯΡ
     Θ΄
     • 愢櫏΅Ϻυϐμ΀Ϳ΅䨗͡΀͚΄͢ቘమ
     • sqlx.DB ΅ repository ΄ Struct ΄Ӿ΁೮͵ͱΡΞ͜΁ͯΡ
     

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137. View Slide

138. View Slide

139. ίυδЀύ
     • ΀Ͳ Go ͡
     • Perl Monger ͢ Golang ΨতΗΞ͜͹ͼ䦒΁Ϝϫ͹͵;ͩΣ
     • Go ΄᥺承՛䯭ͽ਍Ό Perl ;΄ፘ晅ᅩ
     • Web API Ψ֢͹ͼΕΞ͜
     • ϓφϕΨ䨗ͥ
     • Docker Ϡϸϖͭͼ㵕ͯ͡
     • Δ;Η
     

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140. ϓφϕΨ䨗ͥ (1)
     • ϓφϕ΄䨗ͣො
     • ϓφϕ΅ *_test.go ;͚͜͜ݷڹͽ΄Ϣήαϸ΁䨗ͥ
     • ֺ͞Ά̵server.go Ͷ͹͵Ο server_test.go
     • testing ϶αϣ϶ϷΨ import ͭͼ func TestXXX(t *testing.T)
     ͡ΟতΔΡ樛හΨ䨗ͥ
     

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141. ϓφϕΨ䨗ͥ (2)
     • ϓφϕ΄䋚ᤈ΄՛ො
     • go test ͽ䋚ᤈͽͣΡ
     • go test ./… ͽٚ䒐ጱ΁ϓφϕͭͼͥ΢Ρ
     • Perl ΄ prove ΄Ξ͜΀Θ΄
     

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142. Service ΄ϓφϕΨᘍ͞Ρ (1)
     • ΔͰ Service ΄ϓφϕΨ䨗ͥͩ;Ψᘍ͞Δͯ
     • Repository ΅ interface Ψ伋͵ͭͼ͚΢Ά͚͚΄ͽ̵ϓφϕӾ
     ͽ Struct Ψਧ嬝ͭͼͨ͘΢Ά૧๊ͭ͞Ρͩ;͢ͽ̵ͣService
     Ͷͧ΁ᵞӾͯΡͩ;͢ͽͣΔͯ
     

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143. Service ΄ϓφϕΨᘍ͞Ρ (2)
     • ducktyping ͶͧͶ; Service ΄ӾͽͷΙΩ;๗இͭ͵ Repository ΄Ϯ
     ϊϐϖ͢޷Ά΢ͼ͚Ρ͡Υ͡Ο΀͚͡Θͭ΢ΔͱΩ
     • gomock Ψֵ͜;̵樛හ΄޷Ήڊͭ΄殼ଧΚ޷Ήڊͭࢧහ΀ͿΨϓφϕ
     ͯΡͩ;͢ͽͣΔͯ
     • gomock ΅ mockgen ;͚͜πϫЀϖͿψϐϕͽڥአͭΔͯ
     • mockgen ΁ϯϐμͭ͵͚ go ϢήαϸΨჁͯ; interface Ψ伋͵ͭ͵
     go ϢήαϸΨ generate ͭͼͥ΢Δͯ
     

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144. MySQL Ψֵ͹͵ϓφϕ (1)
     • github.com/lestrrat-go/test-mysqld Ψͺ͜͡
     • ΕΩ΀य़অͣ Test::mysqld ΄ go ϪЄϓΰЀν ͽͯ΃
     • test ΄͵Ή΁ਠق΁μϷЄЀ΀ MySQL ΨᒈͷӤͨͼͥ΢ΡΚ
     ͺ
     • ΘͷΣΩ MySQL ΄ᒈͷӤͨ΁䦒樌͢͡͡Ρ΄΅᭿ͧΟ΢΀͚
     

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145. MySQL Ψֵ͹͵ϓφϕ (2)
     • ϓφϕΨṛ᭛΁ࢧͭ͵͚䁰ݳ΅Ԫڹ΁愢හ΄ MySQL Ψ Docker ΀Π
     MySQL::Sandbox ΀ΠͽᒈͷӤͨͼ͚͠ͼࢧͯ΄͢ፘ䄜ΥΟͰ͚͚䶲ͭ͢Δ
     ͯ
     • Perl Ͷ;ව̸ͩ΄͘͵Π΅ΚΠੱͥͫ΢ͼ͚ͼᛔړΘค Test::mysqld Ψ࿞
     姆۸ͯΡොဩΚApp::Prove::Plugin::MySQLParallel Ψ䨗͚͵ΠͭͼΔͭ͵
     • Test::mysqld::pool ;͡ App::Prove::Plugin::MySQLPool ;͚͡Σ͚Σ͘Ρ
     • Go ͽ͚͚ఽͮ΁ΚΡොဩ΅Θ͜ͷΝ͚ᎸᑪͭΔͯ
     

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146. WebςЄϝЄ΄ϓφϕ
     • net/http ΁΅ httptest ;͚͜ WebςЄϝЄϓφϕአ΄϶αϣ϶
     ϷЄ͘͢͹ͼͩ΢Ψͺ͜͡;墋㶨΁ϓφϕΨ䨗ͥͩ;͢ͽͣΔͯ
     • httptest.Server Ψֵ͜;䋚檭΁ςЄϝЄΨᒈͷӤͨͼͥ΢Ρ
     • net.Listen(“tcp”, “127.0.0.1:0”) ;ͥ͡;̵ᑮ͚ͼ͚ΡportΨ
     Listen ͭͼͥ΢Δͯ
     • Test::TCP ጱ΀䱛ᚆ͘͢͹ͼ׎ڥͽͯ΃
     

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147. ΅͚
     

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148. ίυδЀύ
     • ΀Ͳ Go ͡
     • Perl Monger ͢ Golang ΨতΗΞ͜͹ͼ䦒΁Ϝϫ͹͵;ͩΣ
     • Go ΄᥺承՛䯭ͽ਍Ό Perl ;΄ፘ晅ᅩ
     • Web API Ψ֢͹ͼΕΞ͜
     • ϓφϕΨ䨗ͥ
     • Docker Ϡϸϖͭͼ㵕ͯ͡
     • Δ;Η
     

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149. DockerͽϠϸϖͭͼ㵕ͯ͡ (2)
     • φϓϐϤ;ͭͼ΅
     • golang:latest 厏हͽ go Ψ Linux ݻͧ΁Ϡϸϖ
     • alpine / busybox / scratch ΀Ϳ΄敽ᰁ΀αϮЄυ΁Ϡϸϖͭ
     ͵ϝαϗϷΨ COPY
     • ;͚͜ၞ΢ͽͯ
     

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150. DockerͽϠϸϖͭͼ㵕ͯ͡ (2)
     • net/http ϞϐξЄυΨڥአͭͼ͚Ρ;̵dynamic link ΁΀͹ͼͭΔ̵͚ϝα
     ϗϷΨπϡЄͭ͵Ͷͧͽ΅㵕͡΀͚
     • `go build -a -tags netgo -installsuffix netgo` ΀Ϳ;ͭͼϠϸϖͯΡͩ;ͽ
     static link ΁΀͹ͼͥ΢Δͯ
     • ׁਂͭͼ͚Ρ϶αϣ϶Ϸͽ cgo Ψֵ͹ͼ͚Ρ䁰ݳ΅ͳ΢Θ dynamik link ΁
     ΀Ρ΄ͽզӥ΄Ξ͜΁ͭΔͯ
     • `go build -a -tags netgo -installsuffix netgo --ldflags '-extldflags "-static"'`
     

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151. DockerͽϠϸϖͭͼ㵕ͯ͡ (3)
     • WebςЄϝЄ΅ net/http Ψֵͩ͜;͢Α;ΩͿ΀΄ͽ
     dynamic link ΁΀͹ͼͭΔ͜΄΅ϜϫΠ͢ͷ
     • ̵ͭͭ͡golang:latest ͽͳ΄ΔΔ docker build ͭͼͭΔ͜;
     πЀϓϗ͢ 700MB ᑕଶ΁΀͹ͼͭΔ͜΄ͽ̵හMB͡Οහ܈
     MBᑕଶ΄ੜͫ΀ Linux ΨڥአͯΡͩ;Ψ͠㵣ΗͭΔͯ
     

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152. ΅͚
     

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153. ίυδЀύ
     • ΀Ͳ Go ͡
     • Perl Monger ͢ Golang ΨতΗΞ͜͹ͼ䦒΁Ϝϫ͹͵;ͩΣ
     • Go ΄᥺承՛䯭ͽ਍Ό Perl ;΄ፘ晅ᅩ
     • Web API Ψ֢͹ͼΕΞ͜
     • ϓφϕΨ䨗ͥ
     • Docker Ϡϸϖͭͼ㵕ͯ͡
     • Δ;Η
     

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154. Δ;Η
     • Perl ͽङ͹͵Ꭳ挷Ψͺ͡͹ͼ Go ͽ WebςЄϝЄΨ䨗͚ͼ͚ͥ
     ොဩ΁ͺ͚ͼ扖ͭΔͭ͵
     • ᛔړᛔ᫝ΔͶ娞ଶ͚֗͢΄ͽ୚ͣ姆ͣ毇䔴͹ͼ͚ͣ͵͚ͽͯ
     • Perl ֵ͹ͼ͚͵Ո͢奾䯤 Go Ψֵ͹ͼ͚Ρ΄ͽ̵Ϳͩ͡ͽΕ͵
     Ξ͜΀϶αϣ϶Ϸ͘͢͹͵Πͭͼ΀ΩͶ͚͚͡ͽͯ΃
     

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155. ͭ͠Δ͚
     

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