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Web API をデバックするときに必要なたったひとつのこと
Tomokazu Kiyohara
May 16, 2015
Technology
1
280
Web API をデバックするときに必要なたったひとつのこと
Web API 開発の観点からみたロギングのコツについて。
kanazawa.rb meetup 33 発表資料。
Tomokazu Kiyohara
May 16, 2015
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Transcript
Web API Λσόοά͢Δͱ͖ʹඞཁͳ ͨͬͨͻͱͭͷ͜ͱ 2015/05/16 - Kanazawa.rb meetup 33
͔͍͜͠ϩΪϯά ͨ͑͜
͔͍͜͠ϩΪϯά ͨ͑͜
Web API ͷಛ • ଟͷߏཁૉ • ϩʔυόϥϯα, ϦόʔεϓϩΫγ, Ξϓέʔγϣϯαʔόʔ, DB
... • ϓϩηε, εϨου … • ଟͷฒྻॲཧ • ෳΫϥΠΞϯτ, ଟॏ API ίʔϧ …
client A client B RP RP App Server App Server
DB DB Process α ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ Process β ɾ ɾ ɾ ɾ ɾ ɾ LB client A ͔Βͷ API ίʔϧ x ͷ ॲཧύεΛಛఆͯ͠ ͦΕͧΕͷ log Λ grep ͯ͠…
ͦΜͳඋͰେৎ͔ʁ
–T.K, 2013 “։ൃڥͦΜͳෳࡶ͡Όͳ͍ɻෳ Terminal ։͍ͯ log Λ tail ͓͚ͯ͠ेɻ”
–T.K, 2014 “։ൃڥෳࡶͩͬͨ”
–T.K, 2015 “ຊͷόάӡ༻ڥʹͦ͜જΉ”
͔͜͠͞ͷछ • ϩΪϯάશൠ • ͍Ζ͍Ζ͋Δɻ͓͓͍ɻ • ͓άάΓ͍ͩ͘͞ɻ • Web API
ʹߜΔͱ • ूͱࣝผ
ूͱࣝผ
ूͱࣝผ
ϩάͷू • ͢Ͱʹ༷ʑͳΞϓϩʔν͕͋Δ • ݹ͘ syslog • ΠϚυΩ fluentd
ूͱࣝผ
ϩάͷࣝผ • API Call Λࣝผ͢Δ • ߏཁૉԣஅͰࣝผ • αʔόϓϩηεΛ·͍ͨͰࣝผͰ͖Δ͜ͱ͕େࣄ •
API Call ຖʹࣝผ • ΫϥΠΞϯτຖͰͳ͘ Call ຖͰ͋Δ͜ͱ͕େࣄ
Ͳ͏ͬͯʁ • ࣝผࢠΛൃߦͯ͠ߏཁૉؒͰൖ • ͩΕ͕ൃߦʁ • Ͳ͏ͬͯൖʁ
ͩΕ͕ൃߦʁ
client A client B RP RP App Server App Server
DB DB ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ LB APIΫϥΠΞϯτʹ ͬͱ͍ۙߏཁૉ ೖΕ͍͢ͷ͜ͷล
Ͳ͏ͬͯൖʁ
ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ client
A client B RP RP App Server App Server DB DB ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ LB ᶃ API Call ᶄ ࣝผࢠൃߦ ᶅ ࣝผࢠ͖ Ͱ logging ᶆ ࣝผࢠ͖ ͰIPC(call) ᶇ ࣝผࢠ͖ Ͱ logging ᶈ ࣝผࢠ͖ ͰIPC(call) ᶉ ࣝผࢠ͖ Ͱ logging ᶊ ࣝผࢠ͖ ͰIPC(call) ᶋ ࣝผࢠ͖ Ͱ logging ᶌ ࣝผࢠ͖ ͰIPC(res) ᶎ ࣝผࢠ͖ ͰIPC(res) ᶍ ࣝผࢠ͖ Ͱ logging ᶏ ࣝผࢠ͖ Ͱ logging ᶐ ࣝผࢠ͖ ͰIPC(res) ᶑ ࣝผࢠ͖ Ͱ logging ᶒ API Response
γϯϓϧͳ
ԡ͑͞Δ͖ϙΠϯτ͕ ͏ͻͱͭ
Ͳ͏ͬͯʁ • ࣝผࢠΛൃߦͯ͠ߏཁૉؒͰൖ • ͩΕ͕ൃߦʁ • Ͳ͏ͬͯൖʁ
Ͳ͏ͬͯʁ • ࣝผࢠΛൃߦͯ͠ߏཁૉؒͰൖ • ͩΕ͕ൃߦʁ • Ͳ͏ͬͯൃߦʁ • Ͳ͏ͬͯൖʁ New!
client A client B RP RP App Server App Server
DB DB ɾ ɾ ɾ LB ᶃ API Call ᶄ ࣝผࢠൃߦ LB ᶃ' API Call ᶄ' ࣝผࢠൃߦ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ
client A client B RP RP App Server App Server
DB DB ɾ ɾ ɾ LB ᶃ API Call ᶄ ࣝผࢠൃߦ LB ᶃ' API Call ᶄ' ࣝผࢠൃߦ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ
ϩάͷࣝผ • API Call Λࣝผ͢Δ • ߏཁૉԣஅͰࣝผ • αʔόϓϩηεΛ·͍ͨͰࣝผͰ͖Δ͜ͱ͕େࣄ •
API Call ຖʹࣝผ • ΫϥΠΞϯτຖͰͳ͘ Call ຖͰ͋Δ͜ͱ͕େࣄ
ϩάͷࣝผ • API Call Λࣝผ͢Δ • ߏཁૉԣஅͰࣝผ • αʔόϓϩηεΛ·͍ͨͰࣝผͰ͖Δ͜ͱ͕େࣄ •
API Call ຖʹࣝผ • ΫϥΠΞϯτຖͰͳ͘ Call ຖͰ͋Δ͜ͱ͕େࣄ Ұҙੑ (Uniqueness)
client A client B RP RP App Server App Server
DB DB ɾ ɾ ɾ LB ᶃ API Call ᶄ ࣝผࢠൃߦ LB ᶃ' API Call ᶄ' ࣝผࢠൃߦ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ
client A client B RP RP App Server App Server
DB DB ɾ ɾ ɾ LB ᶃ API Call ᶄ ࣝผࢠൃߦ LB ᶃ' API Call ᶄ' ࣝผࢠൃߦ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ɾ ࣝผࢠൃߦ αʔόʔ × The ϘτϧωοΫ
ࢄܕϢχʔΫIDੜ
ࢄܕ࠾൪ख๏ • ࢄͨ͠࠾൪ڥͦΕͧΕͰཱࣗతʹ࠾൪Մೳ Ͱ͋Δ͜ͱ • ࠾൪݁Ռ͕ઈରʹিಥ͠ͳ͍͜ͱ
ࢄܕ࠾൪ख๏ • ࢄͨ͠࠾൪ڥͦΕͧΕͰཱࣗతʹ࠾൪Մೳ Ͱ͋Δ͜ͱ • ࠾൪݁Ռ͕ઈରʹিಥ͠ͳ͍͜ͱ
ࢄܕ࠾൪ख๏ • ࢄͨ͠࠾൪ڥͦΕͧΕͰཱࣗతʹ࠾൪Մೳ Ͱ͋Δ͜ͱ • ࠾൪݁Ռͷিಥ͕֬ӡ༻͞ΕΔγεςϜʹ͓͍ͯ ेʹ֬Ͱ͋Δ͜ͱ
ࢄܕ࠾൪ख๏ • େ͖ͳܻͷϥϯμϜจࣈྻ • UUID
ࢄܕ࠾൪ख๏ • ԋࢉίετ • Snowflake • Twitter ͷ Tweet ID
ੜख๏ • িಥ্͕֬Δ • Twitter ʹͱͬͯे֬
·ͱΊ • Web API ʹ͓͚Δ͔͍͜͠ϩΪϯά • ऩूͱࣝผΛ࣮ݱ͢Δ • ࣝผࢠʹࢄܕϢχʔΫIDੜख๏Λ͍ͪΔ
Thank you Tomokazu Kiyohara http://github.com/kiyohara http://facebook.com/tomokazu.kiyohara