ミドルウェアにmrubyを組み込む方法 / How to Embed mruby into Middlewares Written in C

真夏の技術部&BPR室 TechMTG #3（ペパボ社内勉強会）

Transcript

1. ʙγϯϓϧͳαʔόͷ֦ுΛ୊ࡐʹઆ໌͠·͢ʙ
   ܀ྛ݈ଠ࿠(.01FQBCP *OD
   ਅՆͷٕज़෦#13ࣨ5FDI.5(ʢࣾ಺ษڧձʣ
   ϛυϧ΢ΣΞʹmrubyΛ૊ΈࠐΉํ๏
   

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2. (.0ϖύϘגࣜձࣾ
   ܀ྛ݈ଠ࿠@kentaro
   औక໾$50
   https://kentarok.org
   

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3. ຊτʔΫʹΑͬͯಘΒΕΔ͜ͱ
   w$ͷϓϩάϥϜʹNSVCZΛ૊ΈࠐΈɺNSVCZͷεΫϦ
   ϓτΛ࣮ߦ͢Δํ๏͕Θ͔Γ·͢
   wطଘͷϛυϧ΢ΣΞʹɺNSVCZΛ૊ΈࠐΜͰ֦ுͰ͖
   ΔΑ͏ʹͳΓ·͢
   wͭ·ΓɺOHY@NSVCZͷΑ͏ͳ΋ͷΛ࡞ΕΔΑ͏ʹͳ
   Δͱ͍͏͜ͱͰ͢Ͷʂʢݪཧతʹ͸ʣ
   

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4. ໨࣍
   ֦ு͢Δϛυϧ΢ΣΞ
   NSVCZ૊ΈࠐΈͷखॱ
   ͓ΘΓʹ
   

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5. ֦ு͢Δϛυϧ΢ΣΞ
   

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6. FDIPαʔόΛ֦ு͍͖ͯ͠·͢
   

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7. FDIPαʔόɺΫϥΠΞϯτͷ3VCZͰͷྫ
   αʔό ΫϥΠΞϯτ
   

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8. FDIPαʔόɺΫϥΠΞϯτΛ࣮ߦ
   ೖྗ͞ΕͨจࣈྻΛ
   ͦͷ··ฦ͚ͩ͢ͷ
   αʔόɻ
   

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9. ͳͥFDIPαʔό͔ʁ
   w࣮ࡍ͸ɺ$Ͱॻ͍ͨFDIPαʔόΛ֦ு͠·͢
   w͜ͷFDIPαʔόΛɺͨͱ͑͹OHJOYͷΑ͏ͳϛυϧ΢Σ
   Ξͩͱࢥ͍ͬͯͩ͘͞ɻݪཧతʹ͸ɺಉ͡Α͏ͳ΍Γ
   ํͰ֦ுͰ͖·͢
   w͍͖ͳΓେ͖ͳϛυϧ΢ΣΞʹऔΓ૊ΜͰ΋ͭΒ͍˞
   ͷͰɺ؆୯ͳ΋ͷΛྫʹ͸͡Ί͍͖ͯ·͠ΐ͏
   ˞$ݴޠͱNSVCZͷ஌ࣝʹՃ͑ͯɺର৅ͱͳΔϛυϧ΢ΣΞΛ֦ு͢Δϊ΢ϋ΢΋஌Δඞཁ͕͋Δ͔Βɻ
   

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10. NSVCZΛ૊ΈࠐΜͩFDIPαʔό
    ೖྗ͞ΕͨจࣈྻΛ
    NSVCZͷίʔυͱ͠
    ͯධՁ͠ɺ݁ՌΛฦ
    ͢αʔό
    

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11. ֦ுͨ͠FDIPαʔόͷಛ௃
    w༩͑ΒΕͨจࣈྻΛɺNSVCZͷίʔυͱͯ͠ධՁ͢Δ
    wNSVCZͷίʔυΛ࣮ߦͨ݁͠ՌͷܕΛ൑ผͯ͠ɺద੾
    ͳจࣈྻΛฦ͢
    wFDIPαʔόͷߏ଄ମʢ(em *
    ܕʣͷఏڙ͢Δϝϯό
    ΍ؔ਺ʹNSVCZίʔυ͔Β৮ΕΒΕΔ
    

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12. NSVCZ૊ΈࠐΈͷखॱ
    

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13. ૊ΈࠐΈͷखॱ
    ೖྗ͞ΕͨจࣈྻΛNSVCZͷίʔυͱͯ͠ධՁ͢Δ
    NSVCZͷίʔυͱ૊ΈࠐΈର৅ͷϛυϧ΢ΣΞͱͷ
    ؒͰɺ஋Λద੾ͳܕʹม׵͢Δ
    NSVCZͷίʔυத͔Βϛυϧ΢ΣΞͷίʔυʹ৮Ε
    ͍ͨ৔߹͸ɺΫϥεͱϝιουΛ࡞੒͢Δ
    MJCNSVCZΛϛυϧ΢ΣΞʹ૊ΈࠐΉ
    

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14. ೖྗ͞ΕͨจࣈྻΛ
    NSVCZͷίʔυͱͯ͠ධՁ͢Δ
    

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15. ೖྗΛNSVCZͷίʔυͱ࣮ͯ͠ߦ
    

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16. ͔͜͜ΒͲ͏΍ͬͯઌʹਐΉ͔ʁ
    

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17. NSVCZͱϛυϧ΢ΣΞͷؒͰ
    ஋ͷܕม׵Λ͢Δ
    

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18. ϛυϧ΢ΣΞˠNSVCZˠϛυϧ΢ΣΞ
    NSVCZͷ
    ੈք
    ϛυϧ΢ΣΞͷ
    ੈք
    ϛυϧ΢ΣΞͷ
    ੈք
    (char *
    ܕͰ
    ίʔυΛ౉͢˞
    mrb_valueܕ
    ͔Βద੾ͳܕ΁ม׵
    ˞ࠓճ͸ͦ͏͍ͯ͠Δ͚ͩͰɺ࣮ࡍʹ͸ͦͷଞʹ΋ϑΝΠϧΛΘͨ͢ͱ͔͍Ζ͍Ζํ๏͕͋Γ·͢ɻ
    

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19. mruby_valueܕ͔Βͷܕม׵
    ࣮ࡍͷܕΛ
    ൑ఆ͢Δ
    ܕ͝ͱʹ
    ม׵͍ͯ͘͠
    

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20. લϖʔδͷิ଍
    wࠓճͷྫ͸؆୯ͳFDIPαʔόͳͷͰɺͲͷܕͰ͋ͬ
    ͯ΋͢΂ͯ(char *
    ܕʹม׵͍ͯ͠·͢
    wͨͩ͠ɺݩͷܕ͕Θ͔ΔΑ͏ɺNSVCZίʔυ಺Ͱͷ
    ܕ໊Λࣔ͢จࣈྻΛ෇Ճ͍ͯ͠·͢ɻ
    wҰൠతʹ͸ɺ૊ΈࠐΈର৅ͷϛυϧ΢ΣΞ͕ظ଴͢Δ
    ܕʹม׵͍͖ͯ͠·͢
    

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21. NSVCZίʔυͷத͔Β
    ϛυϧ΢ΣΞͷத਎ʹ৮Δ
    

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22. FDIPαʔόͷίΞߏ଄ମ
    typedef struct em_t {
    int reply_count; // ϦΫΤετ΁ͷฦ৴ճ਺
    char *reply_prefix; // ϓϩϯϓτͷจࣈྻ
    mrb_state *mrb;
    } em;
    Emߏ଄ମͷఆٛ
    

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23. NSVCZͷίʔυ͔Βϛυϧ΢ΣΞʹ৮Δ
    NSVCZ͔Β
    Emߏ଄ମͷ
    ίʔυΛݺͿ
    Χ΢ϯτ͕
    ͞Ε͍ͯΔ
    NSVCZ͔Β
    Emߏ଄ମͷ
    ίʔυΛݺͿ
    ϓϩϯϓτͷ
    จࣈ͕มԽ
    

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24. NSVCZʹΫϥεͱϝιουΛຒΊࠐΉ
    EmΫϥεΛ
    ࡞Δ
    EmΫϥεʹ
    ϝιουΛ࡞Δ
    

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25. mrb_valueܕ
    ͔Βద੾ͳܕ΁ม׵
    NSVCZˠϛυϧ΢ΣΞˠNSVCZ
    ϛυϧ΢ΣΞͷ
    ੈք
    NSVCZͷ
    ੈք
    NSVCZͷ
    ੈք
    mrb_valueܕ
    ΁ม׵
    ͖ͬ͞ͱٯͩͶ
    

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26. ϝιουΛఆٛ͢Δ
    Em ߏ଄ମΛ
    औΓग़͢
    Em ߏ଄ମͷ
    ϝϯό஋Λมߋ
    

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27. ϙΠϯτmrb_stateͷudϝϯό
    mrb_value
    em_mrb_method_set_reply_prefix(mrb_state *mrb, mrb_value self);
    ϝιουఆٛͷγάωνϟ͸ҎԼͷ௨ΓͳͷͰɺ
    em->mrb->ud = self; // udϝϯό͸(void *)ܕ
    // ……snip……
    em *obj = (em *)mrb->ud; // ͳͷͰɺऔΓग़͢ͱ͖ʹΩϟετ͢Δ
    ͋ͱͰ࢖͏ͨΊʹmrb->udʹEmߏ଄ମΛೖΕ͓ͯ͘
    

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28. MJCNSVCZΛ
    ϛυϧ΢ΣΞʹ૊ΈࠐΉ
    

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29. MJCNSVCZΛ૊ΈࠐΉ
    $ gcc src/em.c src/em_server.c \
    -Iinclude -Ivendor/mruby/include \
    -Lvendor/mruby/build/host/lib -lmruby \
    -o build/echo-mruby
    ҎԼͷΑ͏ʹϏϧυͯ͠ɺMJCNSVCZΛ૊ΈࠐΉ
    $ git clone git@github.com:mruby/mruby.git vendor/mruby
    $ cd vendor/mruby && rake all
    NSVCZΛ΋͖ͬͯͯϏϧυ͢Δ
    

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30. ΋ͬͱ͍͍ํ๏͸ˣΛࢀরͷ͜ͱ
    http://hb.matsumoto-r.jp/entry/2015/02/07/011237
    

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31. ͓ΘΓʹ
    

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32. ͋ͱ͸ˣΛΈͯͬͨΒ࡞ΕΔ
    https://github.com/kentaro/echo-mruby
    

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33. ͓ΘΓʹ
    w͍͖ͳΓ͍ͭ͝ϛυϧ΢ΣΞΛ֦ு͠Α͏ͱ͢Δͱɺ
    NSVCZͱؔ܎ͳ͍ͱ͜ΖͰΘ͔Βͳ͘ͳΔͷͰɺ؆୯
    ͳྫͰ૊ΈࠐΈΛߦͬͯΈ·ͨ͠
    w͓࢖͍ͷϛυϧ΢ΣΞͷ֦ுੑʹࠔͬͨΒɺNSVCZΛ
    ૊ΈࠐΉ͜ͱͰָ͕Ͱ͖ͳ͍͔ߟ͑ͯΈ·͠ΐ͏
    w͋ͱ͸ɺ͍͍ײ͡ʹόʔϯʂͱΑΖ͘͠
    

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34. NSVCZ΍ΔͷʹϖύϘΊͪΌ࠷ߴ
    ΤϥʔͰϋϚͬͯࢮΜͰ͚ͨͲɺ
    @matsumotory
    
    @udzura
    
    ͷ໊྆ʹฉ͍ͨΒ͙͢ղܾ͠
    ͨ
    

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