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BFF introduction 2018/11/2 @ AWS Dev Day
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Twitter: @yosuke_furukawa Github: yosuke-furukawa
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/PEFֶԂࡇ։࠵͠·͢ʂʂʂ
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!*5Ͱ#''ͷهࣄΛॻ͖·ͨ͠ʂʂʂʂ
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BFFͱ
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Backends For Frontends
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Backends For Frontends #SPXTFS #'' .JDSP4FSWJDF .JDSP4FSWJDF .JDSP4FSWJDF • ϑϩϯτΤϯυͷͨΊͷόοΫΤϯυαʔό
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Backends For Frontends #SPXTFS #'' .JDSP4FSWJDF .JDSP4FSWJDF .JDSP4FSWJDF ϑϩϯτΤϯυͱόοΫΤϯυʹ͚Δɺ ϚΠΫϩαʔϏεΛҙࣝ͢Δ • ϑϩϯτΤϯυͷͨΊͷόοΫΤϯυαʔό
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Backends For Frontends • Sam Newman ΞʔΩςΫνϟύλʔϯΛఏএ
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Backends For Frontends • ֤छΫϥΠΞϯτ͝ͱʹઐ༻ͷΞμϓλʔΛ ༻ҙ͢Δ
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BFF͕Δ͜ͱ͍͔ͭ͘հ
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BFF use-cases (1) • API Aggregation #'' 6TFS .JDSP4FSWJDF "SUJDMF .JDSP4FSWJDF $PNNFOU .JDSP4FSWJDF 3FRVFTUUPCMPH QBHF 3FRVFTUUPTPNFЖ4FSWJDFT DPODVSSFOUMZ $PODBU&WFSZ+40/ 3FTQPOTF
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• Session Management BFF use-cases (2) #'' 3FRVFTUXJUI TFTTJPOJE (FU5PLFOGSPN 4FTTJPO 4FTTJPO4UPSF JE VTFSOBNF UPLFO 0UIFS"1* 3FRVFTUXJUIUPLFO
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• (Server Side) Rendering BFF use-cases (3) #'' 1BHF3FRVFTU $PNQPOFOUT 5FNQMBUFT 'FUDI%BUB "1* 3FOEFS)5.-
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• File Upload BFF use-cases (4) #'' 'JMF$IVOLFE 6QMPBE "1* 4UPSF'JMF 'JMF4UPSBHF 4 (FU'JMF1BUI "1*3FRVFTUXJUI 'JMF1BUI
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• WebSocket/LongPolling/SSE BFF use-cases (5) #'' 8FC4PDLFU "1* 4VC4DSJCF .FTTBHF2VFVF 1VCMJTI
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BFF CaseStudy: Twitter
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BFF CaseStudy: Twitter
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Mobile Twitter Stack #SPXTFS #'' /PEFKT &YQSFTT3FBDU .JDSP4FSWJDF 4DBMB .JDSP4FSWJDF 4DBMB .JDSP4FSWJDF 4DBMB
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BFF CaseStudy: Twitter • ࠷ॳ Monolith • ్த͔ΒScalaԽͯ͠MicroServices • ࠷ۙMobileͷϑϩϯτ͚ͩ BFF ʹ
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BFF CaseStudy: Netflix
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http://techblog.netflix.com/2012/07/embracing-differences-inside-netflix.html
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Many Devices : Many APIs
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Many Devices : Many APIs
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BFF CaseStudy: Netflix • ଟछଟ༷ͳσόΠεʹରͯ͠ҰݸҰݸʹBFF ʢClient Adapter CodeʣΛஔ͘ • σόΠεؒͷҧ͍ΛBFFͰٵऩ͢Δ • OSFA - One Size Fit All - ͳ REST API Λ࡞Β ͣʹ֤σόΠεຖʹ࠷దԽ͢Δͱ͍͏ߟ͑ํ
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BFF CaseStudy: RecruitTech
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Recruit Technologies • BFFΛNode.js (Express) Ͱߏங͍ͯ͠Δ • API Aggregation • Server Side Rendering (React) • Session Management • File Upload • WebSocket
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Recruit Technologies • Example: booking table
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Recruit Technologies • Example: raico #SPXTFS #'' #BDLFOE"1* 4FTTJPO4UPSF 3FEJT /'4 )5518FC4PDLFU 4FTTJPO .BOBHFNFOU 'JMF4UPSBHF 3&45"1* 4FSWFS4JEF 3FOEFSJOH
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BFFಋೖ͢Δͱ͖ ಋೖ͠ͳ͍ͱ͖
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BFFΛಋೖ͢Δ࣌ • ϑϩϯτΤϯυͱόοΫΤϯυͰ։ൃऀΛۀͤ͞Δ ͜ͱͰૄ݁߹ʹͯ͠ࠓޙͷΤϯϋϯεΛ্͍͛ͨ • ઌఔ͋͛ͨϢʔεέʔεͷΑ͏ͳॲཧ͕ඞཁʢྫɿ SEO ͷͨΊʹαʔόαΠυϨϯμϦϯά͕ඞཁɺϦΞϧλ ΠϜΞϓϦͳͷͰWebSocket͕ඞཁ etcʣ • ϨΨγʔͳγεςϜ͕طʹଘࡏ͓ͯ͠ΓɺͦΕΛ্ʹ ͔Ϳͤͯஈ֊తʹϦΞʔΩςΫτ͍ͨ͠
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ٯʹBFFΛಋೖ͠ͳ͍࣌ • ϑϩϯτͱόοΫ྆ํΛ։ൃͰ͖Δਓ͕ଟ͍ʢϑϧ ελοΫΤϯδχΞ͕ଟ͍ʣ • ϞϊϦγοΫʹαʔϏε։ൃ্ͨ͠ͰϚʔέοτΠ ϯΛΊ͍ͨ • ্ड़ͨ͠Ϣʔεέʔε͕ٻΊΒΕΔ͜ͱ͕গͳ͍ (ྫɿSEOཁΒͳ͍ɺϦΞϧλΠϜͳॲཧ͕ͳ͍ etc)
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BFFΞϯνύλʔϯ
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༁όοΫΤϯυͱϑϩϯτΤϯυΛ͚Δࣄͦͷ ͷ͕Ξϯνύλʔϯ
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BFFΛ2࣮ؒફͯ͠ ࣮ࡍʹؕͬͨ ΞϯνύλʔϯΛհ
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BFF ϑϩϯτΤϯυͱόο ΫΤϯυͷՍ͚ڮͰ͋Γɺ ৫ͷ߹
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BFFΞϯνύλʔϯ ͦͷ1 εύʔείϛϡχέʔγϣϯ
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BFFΞʔΩςΫνϟಉ͕࢜ ૄʹͳΔ͕ɺ ίϛϡχέʔγϣϯ·Ͱૄ(sparse) ʹͳͬͯ͠·͏έʔε
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ྫ1: ςʔϒϧؙݟ͑ API JE OBNF BHF
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#'' .JDSP4FSWJDF .JDSP4FSWJDF .JDSP4FSWJDF \ pSTU@OBNFGPP MBTU@OBNFCBS SPMFIPHF SPMFGVHB ^
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#'' .JDSP4FSWJDF .JDSP4FSWJDF .JDSP4FSWJDF \ pSTU@OBNFGPP MBTU@OBNFCBS SPMFIPHF SPMFGVHB ^ %#ͷεΩʔϚ͕ಁ͚ͯݟ͑Δʂʂʂʂ
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SELECTจ͕ಁ͚ͯݟ͑Δɻ ୯७ͳέʔεͳΒͦΕͰྑ͍͕ɺ snake => camelͷมJOIN͠ ͨεΩʔϚ͕ͦͷ··ݟ͑ͯΔͷ NGɻɻɻ
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ྫ2: N+1 Query API
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#'' .JDSP4FSWJDF .JDSP4FSWJDF .JDSP4FSWJDF (&5VTFST R GPP JEͷϦετ͚ͩฦΔ \ JE< > ^
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#'' .JDSP4FSWJDF .JDSP4FSWJDF .JDSP4FSWJDF JE͔ΒৄࡉΛऔΔʢ˞/ ճ"1*Λ࣮ߦ͍ͯ͠Δɻʣ (&5VTFST (&5VTFST (&5VTFST (&5VTFST (&5VTFST
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#'' .JDSP4FSWJDF .JDSP4FSWJDF .JDSP4FSWJDF JET< > /ճΫΤϦʔ͛ͯΔɻɻɻɻ VTFS\ JE OBNFCBS ^ VTFS\ JE OBNFCBS ^ VTFS\ JE OBNFCBS ^ VTFS\ JE OBNFCBS ^ VTFS\ JE OBNFCBS ^ VTFS\ JE OBNFGPP ^
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ϚΠΫϩαʔϏε͔ͩΒͱ͍ͬͯ APIΛ؆ૉʹ͍͍ͯ͠༁͡Όͳ͍ɻ ݁Ռ:1ϖʔδදࣔ͢Δͷʹ3secͱ ͔͔͔Δ
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શ෦ίϛϡχέʔγϣϯΛͪΌ Μͱऔͬͯͳ͍͔Βى͖Δ • όοΫΤϯυBFF͔ͩΒͱݴͬͯϏδωεϩ δοΫαʔόαΠυʹ͋ΔͷΛΕͳ͍Ͱཉ͠ ͍ʢαϘΒͳ͍Ͱ͘Εʣ • ϑϩϯτΤϯυͲ͏͍͏API͕΄͍͠ͷ͔ͪΌ ΜͱόοΫΤϯυʹཁٻ͢ΔΑ͏ʹͯ͠ཉ͍͠ ʢΩϟϝϧ͕ཉ͍͠ͱ͔͜͜arrayͰ΄͍͠ͱ͔ ͪ͜ΒଆͰͪΌΜͱݴ͏͖ʣ
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શ෦ίϛϡχέʔγϣϯΛͪΌ Μͱऔͬͯͳ͍͔Βى͖Δ • όοΫΤϯυBFF͔ͩΒͱݴͬͯϏδωεϩ δοΫαʔόαΠυʹ͋ΔͷΛΕͳ͍Ͱ ཉ͍͠ • ϑϩϯτΤϯυͲ͏͍͏API͕΄͍͠ͷ͔ ͪΌΜͱόοΫΤϯυʹཁٻ͢ΔΑ͏ʹͯ͠ ཉ͍͠ ΞʔΩςΫνϟૄͰؔରͰ͋Γɺ ίϛϡχέʔγϣϯີͰͳ͚ΕͳΒͳ͍
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ΒͲ͏ͯ͠Δ͔
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ΒͲ͏ͯ͠Δ͔
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ϑϩϯτΤϯυͱόοΫΤϯ υͷର͢ΔͨΊͷϞοΫαʔ όΛ࡞ΓɺೝࣝᴥᴪΛੜ ·ͳ͍Α͏ʹ͍ͯ͘͠ɻ
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ϑϩϯτΤϯυͱόοΫΤϯ υͷର͢ΔͨΊͷϞοΫαʔ όΛ࡞ΓɺೝࣝᴥᴪΛੜ ·ͳ͍Α͏ʹ͍ͯ͘͠ɻ
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DEMO
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͞Βʹ࠷ۙͰ Mock Λॻ͍ ͨΒ Swagger Λੜ͢Δࣄ ͰAPI docsࣗಈੜ͢Δ ΈΛ։ൃத
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DEMO
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BFFΞϯνύλʔϯ ͦͷ2 ΠϯϑϥϨεϙϯγϏϦςΟ
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BFFϑϩϯτΤϯυͷͨΊͷαʔ όͳͷʹɺΠϯϑϥɾӡ༻όοΫ Τϯυʹԡ͚ͯ͠͠·͏έʔε
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Πϯϑϥɾӡ༻ #SPXTFS #'' .JDSP4FSWJDF .JDSP4FSWJDF .JDSP4FSWJDF ͦͦ͜ͷαʔό୭͕ ݟΔͷʁϑϩϯτʁόοΫ Τϯυʁ
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Πϯϑϥɾӡ༻ #SPXTFS #'' .JDSP4FSWJDF .JDSP4FSWJDF .JDSP4FSWJDF ৽͍͠ͷΛ࡞Δͷʹӡ༻ όοΫΤϯυͤʁ
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A. શһ
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Πϯϑϥɾӡ༻ • ӡ༻ͳΜͯͲ͔͚͕ͬͪͩ͢ΔΑ͏ͳΜ͡Όͳ ͍ • ϑϩϯτ։ൃ͢ΔͳΒαʔϏεͷোʹහײ ʹͳΔ͖ͩ͠ɺམͪͨΓͨ͠ΒݟΕΔΑ͏ʹͳ Δ͖ • όοΫΤϯυϑϩϯτͷίʔυ͕Θ͔Βͳ͍͔ Βͱݴͬͯܟԕͪ͠Ό͍͚ͳ͍
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Πϯϑϥɾӡ༻ • ӡ༻ͳΜͯͲ͔͚͕ͬͪͩ͢ΔΑ͏ͳΜ͡Όͳ ͍ • ϑϩϯτ։ൃ͢ΔͳΒαʔϏεͷোʹහײ ʹͳΔ͖ͩ͠ɺམͪͨΓͨ͠ΒݟΕΔΑ͏ʹͳ Δ͖ • όοΫΤϯυϑϩϯτͷίʔυ͕Θ͔Βͳ͍͔ Βͱݴͬͯܟԕͪ͠Ό͍͚ͳ͍ ϑϩϯτΤϯυͱόοΫΤϯυʹ͚͔ͨΒͱݴͬͯαʔ ϏεҰͭɻαʔϏεͷ࣭Λ্͛Δͷશһٿ
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BFFΞϯνύλʔϯ ͦͷ3 ϏοάόϯδϣΠϯτ
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࠷ޙͷ࠷ޙʹͳ͔ͬͯΒόοΫΤϯ υͱϑϩϯτΤϯυΛ݁߹͢Δͱ େମࢮ͵
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Πϯϑϥɾӡ༻ #SPXTFS #'' .JDSP4FSWJDF .JDSP4FSWJDF .JDSP4FSWJDF ϑϩϯτΤϯυNPDL"1* Ͱಈ͍ͯΔΑ͏ʹͳ͖ͬͯ ͨɻ
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Πϯϑϥɾӡ༻ #SPXTFS #'' .JDSP4FSWJDF .JDSP4FSWJDF .JDSP4FSWJDF όοΫΤϯυఆ͍ͯ͠ ΔϦΫΤετύε͢ΔΑ ͏ʹͳͬͨɻ
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ظؒ͋ͱͪΐͬͱɺ࠷ޙͷ࠷ޙʹ ݁߹ͩʂʂʂʂ
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ʊਓਓਓਓਓਓʊ ʼɹવͷࢮɹʻ ʉ^Y^Y^Y^Y^ʉ
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ϏοάόϯδϣΠϯτ • ઈରʹAPIͷϦΫΤετɾϨεϙϯεఆ௨ Γ͡Όͳ͍ɻ • ࣮֬ʹఆ֎ͷى͖Δɻ • ϦΫΤετͷܕ͕string, integer, Ϩεϙϯεͷ status code͕ҧ͏ etc
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ΒͲ͏ͯ͠Δ͔
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+ Proxy
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ग़དྷ͍ͯΔͱ͜Ζ͔Βঃʑʹ ຊʹ͍ͯ͘͠ #SPXTFS #'' 3FBM.JDSP4FSWJDF .PDL 'BLF .PDL 'BLF
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ग़དྷ͍ͯΔͱ͜Ζ͔Βঃʑʹ ຊʹ͍ͯ͘͠ #SPXTFS #'' 3FBM.JDSP4FSWJDF .PDL 'BLF .PDL 'BLF ͋Δఔϑϩϯτઌߦͯ͠ɺը໘Λঃʑʹຊʹ͍ͯ͠ ͘ελΠϧɻͦ͏͢Δͱاըʹಈ͖Λ͍͑͢
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·ͱΊ
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·ͱΊ • BFFͱ • Backends For Frontends • ϑϩϯτΤϯυͷͨΊͷαʔό • ར༻ྫ: API ू, Server Side Rendering, WebSocket, File Upload, Session Management
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·ͱΊ • BFF ʹΞϯνύλʔϯ͋Δ • εύʔείϛϡχέʔγϣϯʢίϛϡχέʔγϣϯ͕ૄ͔ʹͳΔέʔεʣ • ΞʔΩςΫνϟૄʹͯ͠Α͍͕ɺίϛϡχέʔγϣϯૄʹͯ͠ ͍͚ͳ͍ • ΠϯϑϥϨεϙϯγϏϦςΟʢΠϯϑϥͷΛ࣋ͭʣ • ΠϯϑϥΛݟΔͷόοΫΤϯυ͚ͩʹ͋ΒͣɺશһͰݟΔඞཁ͕͋Δ • ϏοάόϯδϣΠϯτʢ࠷ޙͷ࠷ޙʹͳ͔ͬͯΒ݁߹ςετʣ • ࠷ޙͷ࠷ޙʹ݁߹ɻͰͳ͘ग़དྷ্͕Γ࣍ୈɺঃʑʹ݁߹͍ͯ͘͠
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·ͱΊ • DevOps͕Dev/Ops͡Όͳͯ͘DevὑOpsͷΑ ͏ʹ • ϑϩϯτΤϯυ/όοΫΤϯυͰͳ͘ɺ • ϑϩϯτΤϯυὑόοΫΤϯυ • BFF Backend For Frontend Ͱͳ͘ɺ
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·ͱΊ • DevOps͕Dev/Ops͡Όͳͯ͘DevὑOpsͷΑ ͏ʹ • ϑϩϯτΤϯυ/όοΫΤϯυͰͳ͘ɺ • ϑϩϯτΤϯυὑόοΫΤϯυ • BFF Backend For Frontend Ͱͳ͘ɺ #FTU'SJFOE'PSFWFSͰ͋Γ·͢Α͏ʹɻ