Evans: more expressive gRPC client

Transcript

1. at Go 1.10 Release Party in Tokyo
   more expressive gRPC client
   Evans
   

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2. XIPBNJ
   !cJE
   LUS@
   ձ௡େֶֶ෦೥
   ιϥϛπגࣜձࣾαʔόΤϯδχΞ
   

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3. at Go 1.10 Release Party in Tokyo
   more expressive gRPC client
   Evans
   

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4. View Slide

5. ΞδΣϯμ
   w H31$ͱΫϥΠΞϯτπʔϧ܈
   w &WBOTͱ&WBOT͕໨ࢦͨ͠΋ͷ
   w &WBOTͷΞʔΩςΫνϟͱ࣮૷
   

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6. H31$
   

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7. gRPC
   DMJFOUTFSWFSؒͰಁաతʹ௨৴Ͱ͖ΔγεςϜΛ
   ߏங͢ΔͨΊͷ31$ϑϨʔϜϫʔΫ
   

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8. gRPC
   *%-Ͱ"1*εΩʔϚΛఆٛ͢Δ
   ΫϥΠΞϯταʔόͷίʔυΛੜ੒͢Δ
   αʔόͷϩδοΫΛ࣮૷͢Δ
   

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9. H31$3FNPUF1SPDFEVSF$BMMT PGDPVSTF
   IUUQTHSQDJPGBR
   

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11. gRPC ͷྑ͍ͱ͜Ζ
    w"1*࢓༷ͱ࣮૷ͷဃ཭Λ๷͙͜ͱ͕Ͱ͖Δ
    wΫϥΠΞϯταʔόؒͷ*'͕෗ഊ͠ͳ͍
    w4USFBNJOH31$
    wFUD
    

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12. gRPC ͷͭΒ͍ͱ͜Ζ
    w)551͔͠αϙʔτ͍ͯ͠ͳ͍
    wπʔϧɾϛυϧ΢ΣΞ܈͕ॆ࣮͍ͯ͠ͳ͍
    w"1*ͷσόοά͕ͮ͠Β͍
    

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13. gRPC ͷͭΒ͍ͱ͜Ζ
    w)551͔͠αϙʔτ͍ͯ͠ͳ͍
    wπʔϧɾϛυϧ΢ΣΞ܈͕ॆ࣮͍ͯ͠ͳ͍
    w"1*ͷσόοά͕ͮ͠Β͍
    

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14. API ͷσόοά͕ͮ͠Β͍
    wH31$͸σʔλΛγϦΞϥΠζͯ͠΍ΓͱΓ͢Δ
    wDVSM΍XHFU౳ͰςετͰ͖ͳ͍
    wΫϥΠΞϯτίʔυΛ࣮૷͢ΔPSπʔϧͷར༻
    

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15. grpc-ecosystem / polyglot
    w "'"*,
    ࠷΋ߴػೳͳΫϥΠΞϯτ
    w+BWB੡
    wͨ͘͞ΜͷΦϓγϣϯΛίϚϯυϥΠϯͰࢦఆ͢
    Δඞཁ͕͋ͬͯ൥ࡶ
    

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16. grpc-ecosystem / polyglot
    1 $ echo | java -jar polyglot.jar \
    2 --command=call \
    3 --endpoint=: \
    4 --full_method= \
    5 --proto_discovery_root=
    

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17. njpatel / grpcc
    w/PEFKT੡
    w3&1-PS$-*Ͱͷ࣮ߦ͕Մೳ
    w3&1-Ͱ+BWB4DSJQUΛॻ͘ඞཁ͕͋Δ
    wิ׬͕ͳ͍
    

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18. njpatel / grpcc
    

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19. ͍·͍ͪͬ͘͠Γ͜ͳ͍
    

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20. ސ٬
    ͕ຊ౰ʹཉ͔ͬͨ͠΋ͷ
    

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21. ސ٬
    ͕ຊ౰ʹཉ͔ͬͨ͠΋ͷ
    ָʹςετͰ͖ΔΫϥΠΞϯτ
    

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22. Ұ͔Βͭ͘Δͧ
    

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23. LUSFWBOT
    

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24. ktr0731 / evans
    w(P੡
    wָʹ͔ͭ͑ΔΫϥΠΞϯτ
    w1SPUPDPM#V⒎FST
    

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25. Ϣʔεέʔε
    wσόοά
    ɺςετ
    wγΣϧεΫϦϓτ΁ͷ૊ΈࠐΈ
    

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26. σόοάɺςετ
    wجຊతʹखಈͰ"1*Λୟ͘
    wͰ͖Δ͚ͩλΠϓͨ͘͠ͳ͍
    w๛෋ͳิ׬͕ཉ͍͠
    wෳ਺ͷ"1*Λୟ͖͍ͨ৔߹΋͋Δ
    

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27. γΣϧεΫϦϓτ΁ͷ૊ΈࠐΈ
    wTUEJOPSpMFTUEPVU
    w૊ΈࠐΈ΍͍͢ΠϯλʔϑΣʔε͕ඞཁ
    

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28. Ϣʔεέʔε
    wσόοά
    ɺςετ
    3&1-Ϟʔυ
    wγΣϧεΫϦϓτ΁ͷ૊ΈࠐΈ
    ίϚϯυϥΠϯϞʔυ
    

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29. EFNP
    LUSFWBOTEFNP
    
    

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32. Evans Internal
    w εΩʔϚͷϩʔυ
    w &WBOTͷϞσϧ΁ͷม׵
    w 31$ͷൃߦ $-*Ϟʔυ
    PS
    3&1-ͷىಈ 3&1-Ϟʔυ
    
    

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33. DBTF3&1-31$DBMM
    

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34. εΩʔϚͷϩʔυ
    1 func runProtoc(args []string) ([]byte, error) {
    2 buf, errBuf := new(bytes.Buffer), new(bytes.Buffer)
    3
    4 // with "--descriptor_set_out=/dev/stdout"
    5 cmd := exec.Command("protoc", args...)
    6 cmd.Stdout = buf
    7 cmd.Stderr = errBuf
    8 if err := cmd.Run(); err != nil {
    9 if errBuf.Len() != 0 {
    10 return nil, errors.New(errBuf.String())
    11 }
    12 return nil, err
    13 }
    14 return buf.Bytes(), nil
    15 }
    

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35. wHPMBOHQSPUPCVGEFTDSJQUPS
    wHPMBOHQSPUPCVGQSPUP
    εΩʔϚͷϩʔυ
    1 code, _ := runProtoc(args)
    2 ds := descriptor.FileDescriptorSet{}
    3 proto.Unmarshal(code, &ds)
    

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36. Ϟσϧ΁ͷม׵
    wΞϓϦέʔγϣϯ͔Βѻ͍΍͘͢͢ΔͨΊ
    wKIVNQQSPUPSFqFDU΁ͷґଘΛͳͨ͘͢Ί ޙड़
    
    

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37. REPL: read
    wDCBUBHPQSPNQU
    

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38. REPL: read / eval
    wϑΟʔϧυΛ࠶ؼతʹḷΔ
    wϓϦϛςΟϒܕͰ͋Ε͹஋Λೖྗͤ͞Δ
    

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39. 1 message User {
    2 string first_name = 1;
    3 string last_name = 2;
    4 Gender gender = 3;
    5 }
    6
    7 message RegisterUsersRequest {
    8 repeated User users = 1;
    9 }
    type = "double" | "float" | "int32" |
    "int64" | "uint32" | "uint64" |
    "sint32" | "sint64" | "fixed32" |
    "fixed64" | "sfixed32" | "sfixed64" |
    "bool" | "string" | "bytes" |
    messageType | enumType
    

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40. 1 message User {
    2 string first_name = 1;
    3 string last_name = 2;
    4 Gender gender = 3;
    5 }
    6
    7 message RegisterUsersRequest {
    8 repeated User users = 1;
    9 }
    type = "double" | "float" | "int32" |
    "int64" | "uint32" | "uint64" |
    "sint32" | "sint64" | "fixed32" |
    "fixed64" | "sfixed32" | "sfixed64" |
    "bool" | "string" | "bytes" |
    messageType | enumType
    

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41. type = "double" | "float" | "int32" |
    "int64" | "uint32" | "uint64" |
    "sint32" | "sint64" | "fixed32" |
    "fixed64" | "sfixed32" | "sfixed64" |
    "bool" | "string" | "bytes" |
    messageType | enumType
    1 message User {
    2 string first_name = 1;
    3 string last_name = 2;
    4 Gender gender = 3;
    5 }
    6
    7 message RegisterUsersRequest {
    8 repeated User users = 1;
    9 }
    

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42. ϓϦϛςΟϒܕͷೖྗ
    wೖྗΛड͚͚ͭΔ DCBUBHPQSPNQU
    
    wରԠ͢Δܕ΁ม׵
    wϑΟʔϧυʹ஋Ληοτ͢Δ KIVNQQSPUPSFqFDU
    
    wೖྗର৅ͷϝοηʔδ͸ಈతʹܾఆ͞ΕΔ
    

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43. ϝοηʔδͷಈతͳߏங
    wKIVNQQSPUPSFqFDUEZOBNJD.FTTBHF
    wQSPUP.BSTIBMFS࣮૷Λ࣋ͭ
    

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44. ϝοηʔδͷಈతͳߏங
    ֤ϑΟʔϧυ஋ΛEZOBNJD.FTTBHF͕อ࣋
    #V⒎FS.BSTIBM΁QSPUP.FTTBHFͱͯ͠౉͞ΕΔ
    .BSTIBM͕QSPUP.BSTIBMFSͷ࣮૷ΛݺͿ
    EZOBNJD.FTTBHF.BSTIBMʹΑΓγϦΞϥΠζ
    

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45. QSPUP.FTTBHF
    QSPUP.BSTIBMFS
    EZOBNJD.FTTBHF
    Marshal() ([]byte, error)
    CVG
    WBMVFT
    encode
    marshal each field values
    ϝοηʔδͷಈతͳߏங
    

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46. ΞʔΩςΫνϟ
    w $MFBO"SDIJUFDUVSF
    w )FYBHPOBM"SDIJUFDUVSF
    

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47. ͳͥ CA / HA ͔ʁ
    w ࠜװΛࢧ͑ΔϥΠϒϥϦ͕ະ੒ख़
    w $-*Ϟʔυɺ3&1-Ϟʔυ͕͋Δ
    w ίϯϙʔωϯτ͕ଟ͍
    

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48. JOQVUUFS*'
    3&1-
    1SPNQU*OQVUUFS
    DCBUBHPQSPNQU
    
    $-*
    +40/JOQVUUFS
    FODPEJOHKTPO
    
    Entity layer
    Adapter layer UseCase layer
    EFTDSJQUPST
    KIVNQQSPUPSFqFDU
    
    pFMET NFTTBHF
    TFSWJDF*'
    

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49. TODOs
    w ετϦʔϜछ
    w 5-4ରԠ
    w ϦϑϨΫγϣϯαʔόରԠ
    w FUD
    

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50. TODOs
    w ετϦʔϜछ
    w 5-4ରԠ
    w ϦϑϨΫγϣϯαʔόରԠ
    w FUD
    1VMM3FRVFTUT*TTVFT
    XFMDPNF
    

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51. ·ͱΊ
    w ݸਓతʹ͸
    ָʹ͔ͭ͑ΔΫϥΠΞϯτ͕Ͱ͖ͨ
    w ڊਓͷݞʹ৐͍ͬͯΔ͓͔͛Ͱ͢
    w ͱ͸͍͑50%0͸·ͩଟ͍
    

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52. ·ͱΊ
    w ݸਓతʹ͸
    ָʹ͔ͭ͑ΔΫϥΠΞϯτ͕Ͱ͖ͨ
    w ڊਓͷݞʹ৐͍ͬͯΔ͓͔͛Ͱ͢
    w ͱ͸͍͑50%0͸·ͩଟ͍
    ΍͍ͬͯͧ͘ʂʂ
    

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