Consider pluggable CLI tool implementation #gocon

1 Consider pluggable CLI tool implementation Go Conference 2018 Autumn
- @izumin5210

3 grapi1SFTFOUFEPO(P$PO4QpOH https://speakerdeck.com/izumin5210/grapi-bulding-json-api-server-with-grpc-gateway-for-microservices

grapi (Pͷ"1*TFSWFS։ൃମݧΛߴΊΔ$-* QBDLBHF 4 * https://github.com/izumin5210/grapi ** https://cloud.google.com/apis/design/

‣ ϘΠϥϓϨʔτͷTDBGGPMEJOH ن໿ʹଇͬͨΠϯλϑΣʔεʢQSPUPʣͱ࣮૷ʢHPʣͷςϯϓϨʔτੜ੒ (PPHMF"1*%FTJHO(VJEF ʹԊͬͨ΋ͷ͕ੜ੒͞ΕΔ grapi (Pͷ"1*TFSWFS։ൃମݧΛߴΊΔ$-* QBDLBHF
4 * https://github.com/izumin5210/grapi ** https://cloud.google.com/apis/design/

‣ ϘΠϥϓϨʔτͷTDBGGPMEJOH ن໿ʹଇͬͨΠϯλϑΣʔεʢQSPUPʣͱ࣮૷ʢHPʣͷςϯϓϨʔτੜ੒ (PPHMF"1*%FTJHO(VJEF ʹԊͬͨ΋ͷ͕ੜ੒͞ΕΔ ‣ H31$*%- DPEFHFOFSBUJPO
SPVUJOH VO NBSTIBMJOHͳͲؾʹ͠ͳͯ͘ྑ͍ɼ  ຊ࣭ʹϑΥʔΧε͠΍͍͢։ൃମݧΛఏڙ HSQDHBUFXBZΛ಺แ͠ɼ;ͭ͏ͷ+40/"1*TFSWFSͱͯ͠ར༻Մ ΋ͪΖΜɼHBUFXBZͳ͠ͷH31$TFSWFSʹ΋Ͱ͖Δ grapi (Pͷ"1*TFSWFS։ൃମݧΛߴΊΔ$-* QBDLBHF 4 * https://github.com/izumin5210/grapi ** https://cloud.google.com/apis/design/

‣ ϘΠϥϓϨʔτͷTDBGGPMEJOH ن໿ʹଇͬͨΠϯλϑΣʔεʢQSPUPʣͱ࣮૷ʢHPʣͷςϯϓϨʔτੜ੒ (PPHMF"1*%FTJHO(VJEFʹԊͬͨ΋ͷ͕ੜ੒͞ΕΔ ‣ H31$*%- DPEFHFOFSBUJPO
SPVUJOH VO NBSTIBMJOHͳͲؾʹ͠ͳͯ͘ྑ͍ɼ  ຊ࣭ʹϑΥʔΧε͠΍͍͢։ൃମݧΛఏڙ HSQDHBUFXBZΛ಺แ͠ɼ;ͭ͏ͷ+40/"1*TFSWFSͱͯ͠ར༻Մ ΋ͪΖΜɼHBUFXBZͳ͠ͷH31$TFSWFSʹ΋Ͱ͖Δ grapi(Pͷ"1*TFSWFS։ൃମݧΛߴΊΔ$-* QBDLBHF 5 HSBQJʹ৽ͨͳDPEFHFOFSBUPSΛೖΕͨ͘ͳͬͨ ͔ͦ͠͠Ε͸QSPUPCVG͸͔ͭ͏͚ͲH31$͸ͪΐͬͱؔ܎ͳ͍ ୯७ͳ8FCαʔό։ൃʹؔΘͬͯ͘Δ࿩Ͱ΋ͳ͍ HSBQJ͸PQFOͳ෺ͳͷͰɼ͋·Γϔϯͳ΋ͷ͸ೖΕͨ͘ͳ͍ʜ

6 Consider pluggable CLI tool implementation Go Conference 2018 Autumn
- @izumin5210

7 @izumin5210 Application Engineer, Wantedly People Wantedly, Inc.

2ͳͥQMVHJOػߏ͕ඞཁͳͷ͔

2ͳͥQMVHJOػߏ͕ඞཁͳͷ͔ "։ൃऀɾར༻ऀͲͪΒ΋)BQQZʹ͢ΔͨΊ

9 Users ͓٬༷ͷ੠ʢྫʣ ʢ1PTUHSF42-༻πʔϧʹରͯ͠ʣ.Z42-ʹ΋ରԠͯ͠΄͍͠ʂ ʢίʔυδΣωϨʔλʹରͯ͠ʣUFTUJGZͰςετ΋ੜ੒ͯ͠ʂ Author

9 Users ͓٬༷ͷ੠ʢྫʣ ʢ1PTUHSF42-༻πʔϧʹରͯ͠ʣ.Z42-ʹ΋ରԠͯ͠΄͍͠ʂ ʢίʔυδΣωϨʔλʹରͯ͠ʣUFTUJGZͰςετ΋ੜ੒ͯ͠ʂ Author Զͷ੠ʢྫʣ
ʢ1PTUHSF42-͔͠࢖Θ΁Μ͠ʜʣ ʢAUFTUJOHA೿ͳͷͰϞνϕʔγϣϯ͕ͳ͍ʜʣ

Users ͓٬༷ͷ੠ʢྫʣ ʢ1PTUHSF42-༻πʔϧʹରͯ͠ʣ.Z42-ʹ΋ରԠͯ͠΄͍͠ʂ ʢίʔυδΣωϨʔλʹରͯ͠ʣUFTUJGZͰςετ΋ੜ੒ͯ͠ʂ 10 Author ͔ͤͬ͘ݟ͚ͭͯ΋Β͑ͨͷʹʜ
.Z42-࢖ͬͨ͜ͱͳ͍͔Β೉͍͠ʜ ͜͜ͰରԠͪ͠Ό͏ͱɼ΄͔ͷ%#.4΋  αϙʔτཁٻ͕དྷͪΌ͏͔΋ʜ 044CVSOPVUͦ͠͏ 6OIBQQZ Զͷ੠ʢྫʣ ʢ1PTUHSF42-͔͠࢖Θ΁Μ͠ʜʣ ʢAUFTUJOHA೿ͳͷͰϞνϕʔγϣϯ͕ͳ͍ʜʣ

Author Զͷ੠ʢྫʣ ʢ1PTUHSF42-͔͠࢖Θ΁Μ͠ʜʣ ʢAUFTUJOHA೿ͳͷͰϞνϕʔγϣϯ͕ͳ͍ʜʣ 11 Users ͔ͤͬ͘ྑ͍πʔϧʹग़ձͬͨͷʹʜ
ࣗ෼͕ରԠ࡞ۀͯ͠΋͍͍͚Ͳɼ  ࡞ऀ͕.Z42-࢖Θͳ͍ͳΒෆ҆ఆ͔΋ʜ ͔ͩΒͱ͍ͬͯࣗ෼͕ϝϯς͠ଓ͚Δͷ͔ʜʁ 6OIBQQZ ͓٬༷ͷ੠ʢྫʣ ʢ1PTUHSF42-༻πʔϧʹରͯ͠ʣ.Z42-ʹ΋ରԠͯ͠΄͍͠ʂ ʢίʔυδΣωϨʔλʹରͯ͠ʣUFTUJGZͰςετ΋ੜ੒ͯ͠ʂ

Author Զͷ੠ʢྫʣ ʢ1PTUHSF42-͔͠࢖Θ΁Μ͠ʜʣ ʢAUFTUJOHA೿ͳͷͰϞνϕʔγϣϯ͕ͳ͍ʜʣ 12 Users ͓٬༷ͷ੠ʢྫʣ
ʢ1PTUHSF42-༻πʔϧʹରͯ͠ʣ.Z42-ʹ΋ରԠͯ͠΄͍͠ʂ ʢίʔυδΣωϨʔλʹରͯ͠ʣUFTUJGZͰςετ΋ੜ੒ͯ͠ʂ Ϣʔβ͕֎͔Β֦ுͰ͖ΔΑ͏ʹ͢Δ ֎ʹ੾Γग़͞Εͨ%#.4ͷESJWFSΛݺͿ ίʔυੜ੒ͷલޙͰ֎෦ϓϩάϥϜΛݺͿ

13 ຊମΞϓϦ͸ͳΔ΂͘ബ͘อͪͭͭ ֎͔ΒॲཧΛࠩ͠ࠐΊΔιέοτ͕͋Ε͹ྑ͍ Extensibility֦ுੑͷߴ͍πʔϧ

13 ຊମΞϓϦ͸ͳΔ΂͘ബ͘อͪͭͭ ֎͔ΒॲཧΛࠩ͠ࠐΊΔιέοτ͕͋Ε͹ྑ͍ Extensibility֦ுੑͷߴ͍πʔϧ ‣ ϢʔβͷΞϓϦέʔγϣϯίʔυ͔Βར༻ FH42-%SJWFS
Adatabase/sql/driver.DriverA .JEEMFXBSF Ahttp.HandlerA *OUFSDFQUPS Agrpc.*InterceptorA

13 ຊମΞϓϦ͸ͳΔ΂͘ബ͘อͪͭͭ ֎͔ΒॲཧΛࠩ͠ࠐΊΔιέοτ͕͋Ε͹ྑ͍ Extensibility֦ுੑͷߴ͍πʔϧ ‣ ϢʔβͷΞϓϦέʔγϣϯίʔυ͔Βར༻ FH42-%SJWFS
Adatabase/sql/driver.DriverA .JEEMFXBSF Ahttp.HandlerA *OUFSDFQUPS Agrpc.*InterceptorA ‣ طଘΞϓϦέʔγϣϯʹػೳΛ֎෇͚ͯ͠ར༻ FH1SPUPDQMVHJOT 5FSSBGPSNQSPWJEFST 3BJMTHFOFSBUPST ࠓ೔͸ͬͪ͜ͷ࿩

14 Plugin ExperienceϓϥάΠϯͱ%FWFMPQFS&YQFSJFODF Users Plugin Developers

15 Plugin ExperienceϓϥάΠϯͱ%FWFMPQFS&YQFSJFODF ‣ ϢʔβͷυϝΠϯͱπʔϧͷSFRVJSFNFOU͕ζϨͳ͍͔ FHʮΠϯϑϥπʔϧͷϓϥάΠϯػߏʹ/PEFKT͕ඞཁʯ͸ଟ෼͠ΜͲ͍ Users Plugin Developers

15 Plugin ExperienceϓϥάΠϯͱ%FWFMPQFS&YQFSJFODF ‣ ϢʔβͷυϝΠϯͱπʔϧͷSFRVJSFNFOU͕ζϨͳ͍͔ FHʮΠϯϑϥπʔϧͷϓϥάΠϯػߏʹ/PEFKT͕ඞཁʯ͸ଟ෼͠ΜͲ͍ ‣ ෳ਺ਓϓϩδΣΫτͰ΋ར༻Ͱ͖Δ͔
ʮਓʹΑͬͯ࢖ͬͯΔόʔδϣϯ͕ҟͳΔʯ͸஍ࠈ Ϛγϯάϩʔόϧ͡Όͳͯ͘ϓϩδΣΫτϩʔΧϧʹΠϯετʔϧग़དྷͳ͍ͱμϝ Users Plugin Developers

16 Plugin ExperienceϓϥάΠϯͱ%FWFMPQFS&YQFSJFODF Users Plugin Developers ‣ ࣮૷ɾσόοά͸؆୯͔ ݩπʔϧͷίϯςΩετΛࢀরɾར༻Ͱ͖Δ͔
ϩʔΧϧͰ࡞੒தͷ΋ͷΛ࣮πʔϧ͔Βར༻Ͱ͖Δ͔ ࣮૷ͷͨΊͷϨʔϧ͸͋Δ͔

16 Plugin ExperienceϓϥάΠϯͱ%FWFMPQFS&YQFSJFODF Users Plugin Developers ‣ ࣮૷ɾσόοά͸؆୯͔ ݩπʔϧͷίϯςΩετΛࢀরɾར༻Ͱ͖Δ͔
ϩʔΧϧͰ࡞੒தͷ΋ͷΛ࣮πʔϧ͔Βར༻Ͱ͖Δ͔ ࣮૷ͷͨΊͷϨʔϧ͸͋Δ͔ ‣ ഑෍͸؆୯͔ FH0SHBOJ[BUJPOJOUFSOBMͳπʔϧΛOQNʹެ։͢Δͷ͸͠ΜͲ͍

Pluggable tools: Real-World Examples

‣ ମݧͷྑ͍πʔϧ 3BJMT(FOFSBUPST DSFBUFSFBDUBQQ ‣ (PͰ࣮૷͠΍ͦ͢͏ͳπʔϧ QSPUPD
5FSSBGPSN LVCFDUM 42-CPJMEFS Pluggable tools3FBM8PSME&YBNQMFT 18

‣ ࣮૷͕࠷ߴʹΧϯλϯ A3BJMT(FOFSBUPST#BTFAͷαϒΫϥεΛ࡞Δ ͜ͷαϒΫϥε໊͕·Μ·αϒίϚϯυʹʢԼͷίʔυͳΒASBJMTHJOJUJBMJ[FSAʹͳΔʣ ࣮ߦ͢ΔͱQVCMJDNFUIPET͕ఆٛ͞Εͨॱʹݺͼग़͞Ε͍ͯ͘ Ralis Generators*%4-Ͱهड़(FNpMFʹॻ͍ͯಋೖ
19 * https://guides.rubyonrails.org/generators.html#creating-your-ﬁrst-generator class InitializerGenerator < Rails::Generators::Base def create_initializer_file create_file "config/initializers/initializer.rb", "# Add initialization content here" end end

‣ ࣮૷͕࠷ߴʹΧϯλϯ A3BJMT(FOFSBUPST#BTFAͷαϒΫϥεΛ࡞Δ ͜ͷαϒΫϥε໊͕·Μ·αϒίϚϯυʹʢԼͷίʔυͳΒASBJMTHJOJUJBMJ[FSAʹͳΔʣ ࣮ߦ͢ΔͱQVCMJDNFUIPET͕ఆٛ͞Εͨॱʹݺͼग़͞Ε͍ͯ͘ ‣ ಋೖ΋ָ
3BJMTBQQMJDBUJPOىಈ࣌ʹಡ·ΕΕ͹0, HFNԽͯ͠(JU)VCʹஔ͚͹ɼ(FNpMFʹॻ͚ͩ͘ Ralis Generators*%4-Ͱهड़(FNpMFʹॻ͍ͯಋೖ 19 * https://guides.rubyonrails.org/generators.html#creating-your-ﬁrst-generator class InitializerGenerator < Rails::Generators::Base def create_initializer_file create_file "config/initializers/initializer.rb", "# Add initialization content here" end end

‣ ར༻͢ΔUFNQMBUFͷࠩ͠ସ͕͑؆୯ FH`npx create-react-app my-app --scripts-version=react-scripts-ts` Ͱ5ZQF4DSJQUʹͳΔ A--script-versionA͸࠷ऴతʹAyarn
addAʹ౤͛ࠐ·ΕΔͷͰɼ೚ҙͷOQNNPEVMFͷ໊લΛೖΕ͍͍ͯ create-react-app*͍·Ͳ͖ͷ+4FS͸webpack.config.jsॻ͔ͳ͍ΜͰ͢Αʁ<ཁग़య> 20 * https://github.com/facebook/create-react-app

‣ ར༻͢ΔUFNQMBUFͷࠩ͠ସ͕͑؆୯ FH`npx create-react-app my-app --scripts-version=react-scripts-ts` Ͱ5ZQF4DSJQUʹͳΔ A--script-versionA͸࠷ऴతʹAyarn
addAʹ౤͛ࠐ·ΕΔͷͰɼ೚ҙͷOQNNPEVMFͷ໊લΛೖΕ͍͍ͯ ‣ ಠࣗͷUFNQMBUF΋؆୯ʹ࡞ΕΔ ಺෦తʹ͸ASFBDUTDSJQUTAͷAscripts/init.jsAΛ࣮ߦͯ͠Δ͚ͩ ͳͷͰɼʮΦϦδφϧͷASFBDUTDSJQUTAͷJOJUΛ࣮ߦͨ͋͠ͱʹಠࣗͷॲཧΛՃ͑ΔʯΑ͏ͳ  Areact-scripts-<your_module_name>AΛ࡞Ε͹ྑ͍ AZBSOBEEA͕ղऍͰ͖Ε͹͍͍ͷͰɼͱΓ͋͑ͣ(JU)VCʹஔ͍ͱ͚͹ΈΜͳ࢖͑ΔʢͨͿΜʣ create-react-app*͍·Ͳ͖ͷ+4FS͸webpack.config.jsॻ͔ͳ͍ΜͰ͢Αʁ<ཁग़య> 20 * https://github.com/facebook/create-react-app

create-react-app*͍·Ͳ͖ͷ+4FS͸webpack.config.jsॻ͔ͳ͍ΜͰ͢Αʁ<ཁग़య> 21 https://github.com/facebook/create-react-app/blob/v2.1.1/packages/create-react-app/createReactApp.js#L305-L313 if (useYarn) { command = 'yarnpkg'; args
= ['add', '--exact']; // snip. [].push.apply(args, dependencies); args.push('--cwd'); args.push(root); // snip. } else { // snip. } if (verbose) { args.push('--verbose'); } const child = spawn(command, args, { stdio: 'inherit' }); child.on('close', code => { // snip. });

‣ ࣮૷͸TJNQMF FBTZ Aprotoc --foo_out=DIR input.protoAͰAprotoc-gen-fooAͱ͍͏࣮ߦϑΝΠϧΛݺͼग़͢ Ҿ਺ͷ౉͠ํ͸ಠಛ
ର৅ʹͳͬͯΔ QSPUPͳͲ͸TUEJO͔Β ͦͷଞͷҾ਺͸A--foo_out=<args>:DIRAͱ͢Ε͹ʢͨͩͷจࣈྻͱͯ͠ʣ౉ͬͯ͘Δ protoc*࣮ߦ࣌ͷҾ਺೉֮ͯ͑͘͠ΒΕ΁Μ 22 * https://developers.google.com/protocol-buﬀers/docs/reference/go-generated

‣ ࣮૷͸TJNQMF FBTZ Aprotoc --foo_out=DIR input.protoAͰAprotoc-gen-fooAͱ͍͏࣮ߦϑΝΠϧΛݺͼग़͢ Ҿ਺ͷ౉͠ํ͸ಠಛ
ର৅ʹͳͬͯΔ QSPUPͳͲ͸TUEJO͔Β ͦͷଞͷҾ਺͸A--foo_out=<args>:DIRAͱ͢Ε͹ʢͨͩͷจࣈྻͱͯ͠ʣ౉ͬͯ͘Δ ‣ ಋೖ͸ʜ FYFDVUBCMF͔ͭA1"5)Aʹଘࡏ͢ΔPSA--plugin=path/to/protoc-gen-fooAΛ౉ͤ͹ྑ͍ ͲͷݴޠͷίϯςΩετԽʹΑͬͯಋೖ೉қ౓͕มΘΓͦ͏ protoc*࣮ߦ࣌ͷҾ਺೉֮ͯ͑͘͠ΒΕ΁Μ 22 * https://developers.google.com/protocol-buﬀers/docs/reference/go-generated

‣ ࣮૷͸&BTZ ϨʔϧΛෑ͍ͯ͘Ε͍ͯΔʢAgithub.com/hashicorp/terraform/pluginAʣ ಺෦͸Agithub.com/hashicorp/go-pluginA ϓϥάΠϯ͕αʔόɾຊମ͕ΫϥΠΞϯτʹͳͬͯnet/rpcͰ௨৴ Terraform*͔͜͜ΒΑ͏΍͘(Pͷ࿩Ͱ͢ 23
* https://www.terraform.io/docs/plugins/basics.html

‣ ࣮૷͸&BTZ ϨʔϧΛෑ͍ͯ͘Ε͍ͯΔʢAgithub.com/hashicorp/terraform/pluginAʣ ಺෦͸Agithub.com/hashicorp/go-pluginA ϓϥάΠϯ͕αʔόɾຊମ͕ΫϥΠΞϯτʹͳͬͯnet/rpcͰ௨৴ ‣ ಋೖ͸·͋·͋
ಛఆͷσΟϨΫτϦʹFYFDVUBCMFͳ΋ͷΛஔ͚ͩ͘ ஔ͖৔͸ϚγϯશମͰͭͳͷͰɼϓϩδΣΫτ͝ͱʹόʔδϣϯม͑Δͱ͔͸Ͱ͖ͳ͍ ʢ5FSSBGPSNͷ৔߹͸ͦΜͳधཁ΋ͳ͍ͷ͔΋ʣ Terraform*͔͜͜ΒΑ͏΍͘(Pͷ࿩Ͱ͢ 23 * https://www.terraform.io/docs/plugins/basics.html

‣ ࣮૷͸TJNQMF FBTZ Akubectl foo barAͰAkubectl-foo-barAΛ୳࣮ͯ͠ߦ͢Δ ίϯςΩετͱ͔͸؀ڥม਺ʹೖ͍ͬͯΔ
(PͰ͋Ε͹ศརύοέʔδ͕ଘࡏ͢ΔʢAk8s.io/kubectl/pkg/pluginutilsA Ak8s.io/cli-runtimeAʣ kubectl*ਅͬ౰Ͱࣗવͳ΍Γํ 24 * https://kubernetes.io/docs/tasks/extend-kubectl/kubectl-plugins/ https://github.com/kubernetes/kubernetes/blob/v1.12.2/pkg/kubectl/cmd/cmd.go

‣ ࣮૷͸TJNQMF FBTZ Akubectl foo barAͰAkubectl-foo-barAΛ୳࣮ͯ͠ߦ͢Δ ίϯςΩετͱ͔͸؀ڥม਺ʹೖ͍ͬͯΔ
(PͰ͋Ε͹ศརύοέʔδ͕ଘࡏ͢ΔʢAk8s.io/kubectl/pkg/pluginutilsA Ak8s.io/cli-runtimeAʣ ‣ ಋೖ͸·͋·ָ͋ͦ͏ &YFDVUBCMFͳϑΝΠϧஔ͚ͩ͘ ͭ͘Δͱ͖͸มͳϥϯλΠϜʹґଘͤ͞ͳ͍΄͏͕਌੾ kubectl*ਅͬ౰Ͱࣗવͳ΍Γํ 24 * https://kubernetes.io/docs/tasks/extend-kubectl/kubectl-plugins/ https://github.com/kubernetes/kubernetes/blob/v1.12.2/pkg/kubectl/cmd/cmd.go

25 type defaultPluginHandler struct{} func (h *defaultPluginHandler) Execute(executablePath string, cmdArgs,
environment []string) error { return syscall.Exec(executablePath, cmdArgs, environment) } func handleEndpointExtensions(pluginHandler PluginHandler, cmdArgs []string) error { remainingArgs := []string{} // all "non-flag" arguments for idx := range cmdArgs { if strings.HasPrefix(cmdArgs[idx], "-") { break } remainingArgs = append(remainingArgs, strings.Replace(cmdArgs[idx], "-", "_", -1)) } foundBinaryPath := "" for len(remainingArgs) > 0 { path, err := pluginHandler.Lookup(fmt.Sprintf("kubectl-%s", strings.Join(remainingArgs, "-"))) // snip. foundBinaryPath = path break } // snip. if err := pluginHandler.Execute(foundBinaryPath, append([]string{foundBinaryPath}, cmdArgs[len(remainingArgs):]...), os.Environ()); err != nil { return err } return nil } ࣮૷͸ૉ๿ https://github.com/kubernetes/kubernetes/blob/v1.12.2/pkg/kubectl/cmd/cmd.go

SQLBoiler*๻͸͜Ε͕Ұ൪޷͖Ͱ͢ 26 * https://github.com/volatiletech/sqlboiler users, err := models.Users( qm.Where("age >
?", 30), qm.Limit(5), qm.Offset(6), ).All(db, ctx)

‣ 8IBUJT42-#PJMFS ίʔυੜ੒ϕʔεͷ03. %#ͷεΩʔϚΛಡΜͰɼͦΕͬΆ͍TUSVDUͱ࣮૷Λੜ੒ͯ͘͠ΕΔ SQLBoiler*๻͸͜Ε͕Ұ൪޷͖Ͱ͢ 26 *
https://github.com/volatiletech/sqlboiler users, err := models.Users( qm.Where("age > ?", 30), qm.Limit(5), qm.Offset(6), ).All(db, ctx)

‣ 8IBUJT42-#PJMFS ίʔυੜ੒ϕʔεͷ03. %#ͷεΩʔϚΛಡΜͰɼͦΕͬΆ͍TUSVDUͱ࣮૷Λੜ੒ͯ͘͠ΕΔ ‣ Ͳ͕͜QMVHHBCMFʹͳͬͯΔʁ
ཪͷ%#.4ʹͭͳ͍ͰɼεΩʔϚಡΜͰɼϑΝΠϧΛੜ੒͢Δ΍ͭ SQLBoiler*๻͸͜Ε͕Ұ൪޷͖Ͱ͢ 26 * https://github.com/volatiletech/sqlboiler users, err := models.Users( qm.Where("age > ?", 30), qm.Limit(5), qm.Offset(6), ).All(db, ctx)

‣ ࣮૷͕&BTZ ATRMCPJMFS AͳFYFDVUBCMFͳϑΝΠϧΛಡΉ ATRMCPJMEFSESJWFST*OUFSGBDFAͷ࣮૷Λ  AESJWFST%SJWFS.BJOAʹ౉͚ͩ͢ SQLBoiler*๻͸͜Ε͕Ұ൪޷͖Ͱ͢ 27
* https://github.com/volatiletech/sqlboiler func main() { drivers.DriverMain(&driver.PostgresDriver{}) } // Interface abstracts either a side-effect imp // that is called in order to produce the data type Interface interface { // Assemble the database information into a n Assemble(config Config) (*DBInfo, error) // Templates to add/replace for generation Templates() (map[string]string, error) // Imports to merge for generation Imports() (importers.Collection, error) }

‣ ࣮૷͕&BTZ ATRMCPJMFS AͳFYFDVUBCMFͳϑΝΠϧΛಡΉ ATRMCPJMEFSESJWFST*OUFSGBDFAͷ࣮૷Λ  AESJWFST%SJWFS.BJOAʹ౉͚ͩ͢ ‣ ಋೖ͸ʁ
A1"5)AʹFYFDVUBCMFͳϑΝΠϧΛ഑ஔ͢ΔγϦʔζ %SJWFS΋(PQBDLBHFͳͷͰɼͱΓ͋͑ͣAHPHFUAͰ͍͍ όʔδϣϯݻఆ͸ʜ (Pʹ΋UPPMΛϓϩδΣΫτ͝ͱʹ؅ཧ͢Δखஈ͕΄͍͠Ͱ͢Ͷ SQLBoiler*๻͸͜Ε͕Ұ൪޷͖Ͱ͢ 27 * https://github.com/volatiletech/sqlboiler func main() { drivers.DriverMain(&driver.PostgresDriver{}) } // Interface abstracts either a side-effect imp // that is called in order to produce the data type Interface interface { // Assemble the database information into a n Assemble(config Config) (*DBInfo, error) // Templates to add/replace for generation Templates() (map[string]string, error) // Imports to merge for generation Imports() (importers.Collection, error) }

‣ ମݧͷྑ͍πʔϧ 3BJMT(FOFSBUPST3VCZ΍͹͍ DSFBUFSFBDUBQQͺͬͱݟ࣏҆ΘΔ͍͚Ͳɼ69ͱ֦ுੑͷόϥϯε͸ૉ੖Β͍͠ ‣ (PͰ࣮૷͠΍ͦ͢͏ͳπʔϧ QSPUPD
LVCFDUMΘ͔Γ΍͍͚͢ͲϓϥάΠϯͮ͘Γ͕໘౗ 5FSSBGPSNΞϓϩʔν͸͓΋͠Ζ͍͚ͲɼόʔδϣϯϩοΫ͕ඞཁͳ৔໘Ͱ೰·͍͠ 42-#PJMFS(PͰUPPM؅ཧ͢Δखஈ͑͋͞Ε͹ྑͦ͞͏ʁ Pluggable tools3FBM8PSME&YBNQMFT 28

Implements plugin-mechanism into grapi

‣ HSBQJͰٻΊ͍ͨཁ݅ 1MVHJO͕(PͰ͋Δඞཁੑ͸ͳ͍ ͕ɼͳΜΒ͔ͷQBDLBHFNBOBHFSʹ৐͔ͬͬͨ΄͏͕࣮૷͸ָ HSBQJ͕࣋ͬͯΔQSPUPD࣮ߦػೳ͸ར༻͍ͨ͠ ಋೖʹ಄Λ࢖Θͳ͍ͱ͍͚ͳ͍ͷ͸ආ͚͍ͨ
όʔδϣϯϩοΫ͸ඞਢ Approach)PXUPJNQMFNFOUQMVHJONFDIBOJTJOUPHSBQJ 30

όʔδϣϯϩοΫ͸ඞਢ Approach)PXUPJNQMFNFOUQMVHJONFDIBOJTJOUPHSBQJ 31 ݁ہ(PͰ΍Δલఏͩͱָͦ͏ 42-#PJMFSͱಉ͡Α͏ͳ  )FMQFSΛ༻ҙͯ͋͛͠Δ

όʔδϣϯϩοΫ͸ඞਢ Approach)PXUPJNQMFNFOUQMVHJONFDIBOJTJOUPHSBQJ 32 πʔϧͷύοέʔδΛWFOEPSJOHͯ͠ɼ  ͦΕΛ؅ཧɾϏϧυͰ͖Δ࢓૊Έ͕͋Δͱྑͦ͞͏

5PPMEFQFOEFODJFTΛ؅ཧɾ࣮ߦ͢Δπʔϧ github.com/izumin5210/gex5IFJNQMFNFOUBUJPOPGDMBSJGZCFTUQSBDUJDFGPSUPPMEFQFOEFODJFT 33 // Code generated by github.com/izumin5210/gex. DO NOT
E // +build tools package tools // tool dependencies import ( _ "github.com/haya14busa/reviewdog/cmd/reviewdog" _ "github.com/srvc/wraperr/cmd/wraperr" _ "golang.org/x/lint/golint" )

5PPMEFQFOEFODJFTΛ؅ཧɾ࣮ߦ͢Δπʔϧ ಺෦తʹ͸AEFQAAHPNPEA͍ͣΕ͔Λར༻͍ͯ͠Δ ͷͰɼͨͩ͘͠όʔδϣϯϩοΫ͞ΕΔ github.com/izumin5210/gex5IFJNQMFNFOUBUJPOPGDMBSJGZCFTUQSBDUJDFGPSUPPMEFQFOEFODJFT 33 // Code generated
by github.com/izumin5210/gex. DO NOT E // +build tools package tools // tool dependencies import ( _ "github.com/haya14busa/reviewdog/cmd/reviewdog" _ "github.com/srvc/wraperr/cmd/wraperr" _ "golang.org/x/lint/golint" )

5PPMEFQFOEFODJFTΛ؅ཧɾ࣮ߦ͢Δπʔϧ ಺෦తʹ͸AEFQAAHPNPEA͍ͣΕ͔Λར༻͍ͯ͠Δ ͷͰɼͨͩ͘͠όʔδϣϯϩοΫ͞ΕΔ AUPPMTHPAͱ͍͏ϑΝΠϧΛੜ੒ͯ͠JNQPSU͍ͯ͠Δ *NQPSUͯ͠ͳ͍ϑΝΠϧ͸؅ཧ͞Εͳ͍ͷͰ github.com/izumin5210/gex5IFJNQMFNFOUBUJPOPGDMBSJGZCFTUQSBDUJDFGPSUPPMEFQFOEFODJFT
33 // Code generated by github.com/izumin5210/gex. DO NOT E // +build tools package tools // tool dependencies import ( _ "github.com/haya14busa/reviewdog/cmd/reviewdog" _ "github.com/srvc/wraperr/cmd/wraperr" _ "golang.org/x/lint/golint" )

5PPMEFQFOEFODJFTΛ؅ཧɾ࣮ߦ͢Δπʔϧ ಺෦తʹ͸AEFQAAHPNPEA͍ͣΕ͔Λར༻͍ͯ͠Δ ͷͰɼͨͩ͘͠όʔδϣϯϩοΫ͞ΕΔ AUPPMTHPAͱ͍͏ϑΝΠϧΛੜ੒ͯ͠JNQPSU͍ͯ͠Δ *NQPSUͯ͠ͳ͍ϑΝΠϧ͸؅ཧ͞Εͳ͍ͷͰ
΋ͱ΋ͱ͸AmockgenAͷόʔδϣϯΛݻఆͨͯ͘͠࡞ͬͨ github.com/izumin5210/gex5IFJNQMFNFOUBUJPOPGDMBSJGZCFTUQSBDUJDFGPSUPPMEFQFOEFODJFT 33 // Code generated by github.com/izumin5210/gex. DO NOT E // +build tools package tools // tool dependencies import ( _ "github.com/haya14busa/reviewdog/cmd/reviewdog" _ "github.com/srvc/wraperr/cmd/wraperr" _ "golang.org/x/lint/golint" )

5PPMEFQFOEFODJFTΛ؅ཧɾ࣮ߦ͢Δπʔϧ ಺෦తʹ͸AEFQAAHPNPEA͍ͣΕ͔Λར༻͍ͯ͠Δ ͷͰɼͨͩ͘͠όʔδϣϯϩοΫ͞ΕΔ AUPPMTHPAͱ͍͏ϑΝΠϧΛੜ੒ͯ͠JNQPSU͍ͯ͠Δ *NQPSUͯ͠ͳ͍ϑΝΠϧ͸؅ཧ͞Εͳ͍ͷͰ
΋ͱ΋ͱ͸AmockgenAͷόʔδϣϯΛݻఆͨͯ͘͠࡞ͬͨ ʢ͙͢ެࣜʹ΋ೖΔͰ͠ΐʜͱ͍͏ࢥ͍͕͋ΔͷͰബ͘Ͱ͖͍ͯΔʣ github.com/izumin5210/gex5IFJNQMFNFOUBUJPOPGDMBSJGZCFTUQSBDUJDFGPSUPPMEFQFOEFODJFT 33 // Code generated by github.com/izumin5210/gex. DO NOT E // +build tools package tools // tool dependencies import ( _ "github.com/haya14busa/reviewdog/cmd/reviewdog" _ "github.com/srvc/wraperr/cmd/wraperr" _ "golang.org/x/lint/golint" )

όʔδϣϯϩοΫ͸ඞਢ Approach)PXUPJNQMFNFOUQMVHJONFDIBOJTJOUPHSBQJ 34 πʔϧͷύοέʔδΛWFOEPSJOHͯ͠ɼ  ͦΕΛ؅ཧɾϏϧυͰ͖Δ࢓૊Έ͕͋Δͱྑͦ͞͏ ಺෦తʹHFYΛ͔ͭ͑͹Αͦ͞͏ʂ

Plugin exampleHSQBJHFODPNNBOE 35

Plugin exampleHSQBJHFODPNNBOE 35 γϯϓϧͳྫ

Plugin exampleHSQBJHFODPNNBOE 35 γϯϓϧͳྫ ੩తϑΝΠϧʢUFNQBMUFʣͷFNCFEEJOHʹ͸WGTHFOΛ࢖ͬͨ ಺෦తʹ͸AIUUQ'JMF4ZTUFNAʹͳΕ͹ԿͰ΋͍͍

Plugin exampleHSQBJHFODPNNBOE 35 γϯϓϧͳྫ ੩తϑΝΠϧʢUFNQBMUFʣͷFNCFEEJOHʹ͸WGTHFOΛ࢖ͬͨ ಺෦తʹ͸AIUUQ'JMF4ZTUFNAʹͳΕ͹ԿͰ΋͍͍
ੜ੒ίʔυΛTOBQTIPUUFTU͍ͯ͠Δ - github.com/bradleyjkemp/cupaloy

Plugin exampleHSQBJHFOUZQF 36

Plugin exampleHSQBJHFOUZQF 36 ͪΐͬͱ͚ͩ΍΍͍͜͠ྫ %*ͱ͔͋Δͷ͸ɼHSBQJຊମͷQSPUPD8SBQQFSΛར༻͍ͨͨ͠Ί ຊମ͕಺෦ͰXJSFΛ࢖͍ͬͯΔͷͰɼͦΕʹ৐͔ͬͬͨ
ͳͷͰผʹඞਢ͡Όͳ͍

Plugin exampleHSQBJHFOUZQF 37 func main() { buildCommand(di.NewApp).MustExecute() } func buildCommand(createApp
di.CreateAppFunc, opts ...gencmd.Option) gencmd.Exec { return gencmd.New( "type", newGenerateCommand(createApp), newDestroyCommand(), opts..., ) } func newGenerateCommand(createApp di.CreateAppFunc) *gencmd.Command { var ( app *di.App

Plugin exampleHSQBJHFOUZQF 38 func newGenerateCommand(createApp di.CreateAppFunc) *gencmd.Command { var (
app *di.App ) return &gencmd.Command{ Use: "generate NAME", Short: "Generate a new type", Args: cobra.ExactArgs(1), TemplateFS: template.FS, ShouldInsideApp: true, PreRun: func(c *gencmd.Command, args []string) error { var err error app, err = createApp(c) return errors.WithStack(err) }, BuildParams: func(c *gencmd.Command, args []string) (interface{}, error) { return buildParams(args[0], c.Ctx().Ctx) }, PostRun: func(c *gencmd.Command, args []string) error { return errors.WithStack(app.Protoc.Exec(context.TODO())) }, } }

app *di.App ) return &gencmd.Command{ Use: "generate NAME", Short: "Generate a new type", Args: cobra.ExactArgs(1), TemplateFS: template.FS, ShouldInsideApp: true, PreRun: func(c *gencmd.Command, args []string) error { var err error app, err = createApp(c) return errors.WithStack(err) }, BuildParams: func(c *gencmd.Command, args []string) (interface{}, error) { return buildParams(args[0], c.Ctx().Ctx) }, PostRun: func(c *gencmd.Command, args []string) error { return errors.WithStack(app.Protoc.Exec(context.TODO())) }, } } ґଘϞδϡʔϧͷॳظԽ ͜͜Ͱ͸ࣗલͷ%*DPOUBJOFSΛ  ࢖͍ͬͯΔ͕ɼ;ͭ͏͸Կ΋͠ͳ͍

app *di.App ) return &gencmd.Command{ Use: "generate NAME", Short: "Generate a new type", Args: cobra.ExactArgs(1), TemplateFS: template.FS, ShouldInsideApp: true, PreRun: func(c *gencmd.Command, args []string) error { var err error app, err = createApp(c) return errors.WithStack(err) }, BuildParams: func(c *gencmd.Command, args []string) (interface{}, error) { return buildParams(args[0], c.Ctx().Ctx) }, PostRun: func(c *gencmd.Command, args []string) error { return errors.WithStack(app.Protoc.Exec(context.TODO())) }, } } UFYUUFNQMBUFʹ౉Δύϥϝλ૊Έཱͯ ϑΝΠϧͷੜ੒ɾॏෳ൑ఆͳͲ͸  উखʹ΍ͬͯ͘ΕΔ

app *di.App ) return &gencmd.Command{ Use: "generate NAME", Short: "Generate a new type", Args: cobra.ExactArgs(1), TemplateFS: template.FS, ShouldInsideApp: true, PreRun: func(c *gencmd.Command, args []string) error { var err error app, err = createApp(c) return errors.WithStack(err) }, BuildParams: func(c *gencmd.Command, args []string) (interface{}, error) { return buildParams(args[0], c.Ctx().Ctx) }, PostRun: func(c *gencmd.Command, args []string) error { return errors.WithStack(app.Protoc.Exec(context.TODO())) }, } } ੜ੒ͷલޙʹ೚ҙͷॲཧΛڬΊΔ ͜͜Ͱ͸QSPUPDΛ͍͍ײ͡ʹ  ࣮ߦ͍ͯ͠Δ

‣ ςετ༻ͷNPDLTUVC͸༻ҙͯ͋͛͠Δ ͓͠ΌΕඪ४ग़ྗͱ͔ɼࠓճͷ৔߹ͩͱQSPUPDͱ͔ ‣ &YBNQMFΛ༻ҙͯ͋͛͠Δ ͜Ε͕Ұ൪ମݧྑ͘ͳΔؾ͕͢Δ HSBQJͷ৔߹͸HFOFSBUPS͕͢΂ͯQMVHJOʹͳ͍ͬͯΔͷͰɼ͜Ε͕ͦͷ··FYBNQMFʹͳΔ
ͨͩυΩϡϝϯτ͕ͳ͍ͷͰʜ ‣ 1MVHJOHFOFSBUPSΛఏڙ͢Δ 50%0ͭ͗ͷϦϦʔεʹؚΊΔ TipsGPSJNQSPWJOH%FWFMPQFS&YQFSJFODF 42

Go Conference 2018 Autumn - @izumin5210 ConclusionΈΜͳ͕޾ͤʹͳΔπʔϧΛ࡞ΔͨΊʹ ‣ ϝΠϯ͡Όͳ͍ػೳ͸ɼQMVHJOͱͯ͠ఏڙͰ͖ΔΑ͏ʹ͢Δ
044CVSOPVU๷ࢭ ܧଓతʹϝϯς͍ͯͨ͘͠Ίʹ΋ɼʮͻͱͭͷ͜ͱΛ͏·͘΍ΔʯΞʔΩςΫνϟ ‣ ࢖͍΍͍͢ɾ࡞Γ΍͍͢QMVHJOػߏ Ϣʔβͷ஌ࣝɾπʔϧͷίϯςΩετʹ͋ͬͨखஈͰఏڙͰ͖ΔΑ͏ʹ AHJUDMPOFA௚ޙͰ΋໰୊ͳ͘࢖͍࢝ΊΒΕΔΑ͏ʹ ϓϥάΠϯΛ࡞Δਓ΋CVSOPVU͠ͳ͍Α͏ʹ

Consider pluggable CLI tool implementation #gocon

Consider pluggable CLI tool implementation #gocon

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