circuit_switch: small start to create gem

by makicamel

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DJSDVJU_TXJUDI   ͍ͪ࢝͘͞ΊΔHFNͮ͘Γ 2021.10.10. Kaigi on Rails _2021_ new @makicamel

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w!NBLJDBNFM઒ݪສق w3VCZͱϏʔϧɹɹͱ͓ञ͕޷͖ w޷͖ͳ73ήʔϜ ࣗݾ঺հ

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࠷ۙࠔ͍ͬͯΔ͜ͱ ͓࢓ࣄͰ

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ো֐͕ଟ͍

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•ӨڹൣғௐࠪΛ͕Μ͹Ζ͏ •ϨϏϡʔΛ͕Μ͹Ζ͏ •ࣗಈςετͷ௥ՃɾϝϯςΛ͕Μ͹Ζ͏ •खಈςετΛ͕Μ͹Ζ͏ •Τϥʔ؂ࢹΛ͕Μ͹Ζ͏ ো֐Λىͨ͜͠ਓྨͷߟ͕͑ͪͳ͜ͱ ΋ͬͱ ΋ͬͱ ΋ͬͱ ΋ͬͱ ΋ͬͱ

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͕Μ͹Γͨ͘ͳ͍

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•͕Μ͹ΔͱϛεΔ •͕Μ͹Γ͸ݸਓʹґଘ •͕Μ͹ΔͱർΕΔ •͕Μ͹Δ͸Ӭԕʹ͸ܧଓͰ͖ͳ͍ ͕Μ͹Γͨ͘ͳ͍

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࢓૊ΈͰͳΜͱ͔͍ͨ͠

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ɹো֐͕ଟ͍ΜͰ͢Α…😣 ɹ90% ϛε͕ͳ͍͜ͱͷอূ͸ͦͦ͜͜Ͱ͖Δ͚Ͳ   ɹ100% ϛε͕ͳ͍͜ͱͷอূ͸ͱͯ΋ߴίετ ɹϦϦʔεස౓Λ্͛Δͷ͕೉ͯ͘͠…😭 ɹ͙͢ʹ੾Γ໭ͤΔΑ͏ʹͨ͠ํ͕   ɹ݈શ͔΋͠Ε·ͤΜͶ

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•ϦϦʔε͸िʹ 1 ճ ˞   ˞ো֐ରԠΛআ͘

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•ϦϦʔε͸िʹ 1 ճ •100ʙ200 Pull Requests •500ʙ1,000 commits •10Kʙ60K lines ˞ ϏοάόϯϦϦʔε   ˞Ұ൪ݹ͘ػೳ͕ଟ͍ϞϊϦγοΫϦϙδτϦʹ͓͚Δ਺ɻଟ͘ͷଞϦϙδτϦ͸΋ͬͱԺ΍͔Ͱ͢   ˞ো֐ରԠΛআ͘ ˞

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ϦϦʔείετ͕ߴͯ͘ো֐͕ଟ͘ɾେ͖͘ͳΓ͕ͪ ো֐͕ଟͯ͘ϦϦʔεස౓Λ্͛ΒΕͳ͍ ϏοάόϯϦϦʔε

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ͱ͍͏Θ͚Ͱ

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ͭͬͨ͘ NBLJDBNFMDJSDVJU@TXJUDI   IUUQTHJUIVCDPNNBLJDBNFMDJSDVJU@TXJUI

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circuit_switch

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circuit_switch ΍Γ͍ͨ͜ͱɿ ϦϦʔεස౓Λ͋͛Δ   ˞ϦϦʔεස౓΋͍͋͛ͨͰ͢

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circuit_switch ΍Γ͍ͨ͜ͱɿ ௿ίετʹ੾Γ໭͢

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circuit_switch if CircuitSwitch.open?(close_if_reach_limit: false) do_something_experimental else call_existing_codes end CircuitSwitch.report(if: unexpected_happen)

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circuit_switch if CircuitSwitch.open?(close_if_reach_limit: false) do_something_experimental else call_existing_codes end

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circuit_switch •CircuitSwitch ͕։͍͍ͯΔ࣌ do_something_experimental ΛݺͿ •CircuitSwitch ͕ด͡ΒΕͨ࣌ call_existing_codes ΛݺͿ if CircuitSwitch.open?(close_if_reach_limit: false) do_something_experimental else call_existing_codes end

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circuit_switch •CircuitSwitch ͷ։ด৚݅ نఆ্ݶճ਺ʹ౸ୡ ։์৚݅ͱҰக ด࠯৚݅ͱҰக ৗ࣮࣌ߦʴڧ੍ด࠯

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circuit_switch •CircuitSwitch ͷ։ด৚݅ if CircuitSwitch.open?(reach_limit: 100) do_something_experimental else call_existing_codes end نఆ্ݶճ਺ʹ౸ୡ ։์৚݅ͱҰக ด࠯৚݅ͱҰக ৗ࣮࣌ߦʴڧ੍ด࠯

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circuit_switch if CircuitSwitch.open?(if: current_user.testing?) do_something_experimental else call_existing_codes end •CircuitSwitch ͷ։ด৚݅ نఆ্ݶճ਺ʹ౸ୡ ։์৚݅ͱҰக ด࠯৚݅ͱҰக ৗ࣮࣌ߦʴڧ੍ด࠯

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circuit_switch if CircuitSwitch.open?( close_if: Date.today > some_period ) do_something_experimental else call_existing_codes end •CircuitSwitch ͷ։ด৚݅ نఆ্ݶճ਺ʹ౸ୡ ։์৚݅ͱҰக ด࠯৚݅ͱҰக ৗ࣮࣌ߦʴڧ੍ด࠯

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circuit_switch rake circuit_switch:terminate_to_run   [/app/services/greetings_service:21 block   in validate] •CircuitSwitch ͷ։ด৚݅ if CircuitSwitch.open?(close_if_reach_limit: false) do_something_experimental else call_existing_codes end نఆ্ݶճ਺ʹ౸ୡ ։์৚݅ͱҰக ด࠯৚݅ͱҰக ৗ࣮࣌ߦʴڧ੍ด࠯

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circuit_switch CircuitSwitch.report(if: unexpected_happen) •CircuitSwitch ͕։͍͍ͯΔ࣌ report ΛૹΔ •Slack ΍ Bugsnag ͳͲ೚ҙͷϨϙʔτπʔϧΛࢦఆ •։ด৚݅͸ open? ͱྨࣅͷ৚݅Λࢦఆ

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circuit_switch •ґଘϥΠϒϥϦ •ActiveRecord •࣮ߦߦʢcallerʣɾCircuitSwitch ͷ։ดঢ়ଶΛ DB ʹอଘ •ActiveJob •DB ߋ৽ɾϨϙʔτ

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circuit_switch •ίʔυϦʔμʔͷΈͲ͜Ζ

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circuit_switch •ίʔυϦʔμʔͷΈͲ͜Ζ •ͳ͍

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circuit_switch •ίʔυϦʔμʔͷΈͲ͜Ζ •ͳ͍ •ͳ͍ͷ͕ΈͲ͜Ζʢʁʣ

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ΈͲ͜Ζ •Կ΋มΘͬͨ͜ͱΛ΍͍ͬͯͳ͍ •Rails ͷίʔυ͕ॻ͚ͨΒॻ͚Δ •ࠓ͙͢ॻ͖࢝ΊΒΕΔ

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ΈͲ͜Ζ •;ͭ͏ͷ Rails ΞϓϦ͕ґଘ͍ͯ͠ΔϥΠϒϥϦʹґଘ •ࠓ͙͢ಋೖͰ͖Δ

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ͱ͜ΖͰ͓ؾ͖͔ͮͱࢥ͍·͕͢

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Inspired by •Feature Toggles •CircuitBreaker 'FBUVSF5PHHMFTNBSUJOGPXMFSDPN   IUUQTNBSUJOGPXMFSDPNBSUJDMFTGFBUVSFUPHHMFTIUNM $JSDVJU#SFBLFSNBSUJOGPXMFSDPN   IUUQTNBSUJOGPXMFSDPNCMJLJ$JSDVJU#SFBLFSIUNM

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Feature Toggles •৽ػೳΛಛఆϢʔβʹ҆શɾ଎΍͔ʹఏڙ͢ΔͨΊͷ࢓૊Έ •ؔ࿈ɿDark Launch •🙅 େن໛ feature ϒϥϯν্Ͱͷ։ൃ   🙆 master(main) ϒϥϯνʹ߹ྲྀͨ͠։ൃ 'FBUVSF5PHHMFTNBSUJOGPXMFSDPN   IUUQTNBSUJOGPXMFSDPNBSUJDMFTGFBUVSFUPHHMFTIUNM

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Feature Toggles •ΧφϦΞϦϦʔε •ϥϯμϜબग़ͷۃҰ෦ͷҰൠϢʔβʹػೳ։์༷ͯ͠ࢠݟ •A / B ςετ 'FBUVSF5PHHMFTNBSUJOGPXMFSDPN   IUUQTNBSUJOGPXMFSDPNBSUJDMFTGFBUVSFUPHHMFTIUNM

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CircuitBreaker •αʔόʹಛఆճ਺Ҏ্ͷো֐͕ൃੜͨ࣌͠ʹ   ϦΫΤετΛड͚෇͚ͣʹΤϥʔΛฦ͢࢓૊Έ •ো֐ͷ࿈࠯తͳൃੜΛ๷͙ •αʔό͕վળͨ͠ΒࣗಈͰ෮ؼ͢Δ $JSDVJU#SFBLFSNBSUJOGPXMFSDPN   IUUQTNBSUJOGPXMFSDPNCMJLJ$JSDVJU#SFBLFSIUNM

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Inspired by … ?

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Inspired by … ? •ΠϯεύΠΞ͞Εͨͱ͍͏ʹ͸࢓૊Έ͕͠ΐ΅͍ •τάϧͷ؅ཧʹ೉͕͋Δ •ϒϨʔΧʔΛམͱ͢৚͕݅ͨͩͷճ਺ •ࣗಈ෮ؼ͠ͳ͍ •DB ΞΫηεΛ͢ΔͷͰΦʔόʔϔου͕ੜ͡Δ

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Ұ఺ूத •΄͍͠ͷ͸ʮ௿ίετʹ੾Γ໭ͤΔʯ࢓૊Έ •ͱʹ͔͘ࠓ΄͍͠ ػೳ͚ͩΛ࣮૷ͯ͠ϦϦʔε

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ॠൃྗ •ͱΓ͋͑ͣ΄͔ͬͨ͠ •ϨϏϡʔɾௐࠪɾςετίετ͕૿େ͍ͯ͠Δঢ়گΛվળ͍ͨ͠ •ݱ৔ͷࠓ͋Δ՝୊Λࠓ͙͢ղܾ͍ͨ͠ •଍Γͳ͍஌ࣝɾٕज़͸ͨ͘͞Μ͋Δ •४උ͕Ͱ͖Δ·Ͱ଴ͭͱ͋ͬͱ͍͏ؒʹ݄೔͕ա͗Δ

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ॠൃྗ •MVP •Minimum Viable Product •࣮༻࠷খݶͷ੡඼ •ఏڙ͠ͳ͕Β։ൃ͢Δ

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΍Βͳ͍ཧ༝ •ͦ͏͔΋͠Εͳ͍ •ͦ͏Ͱͳ͍͔΋͠Εͳ͍ •OSS ʹ͓͚ͯ͠͹୭͔ͷ໾ʹཱ͔ͭ΋͠Εͳ͍ •OSS ʹ͠ͳ͍ཧ༝͸ͳ͍ ɹgem ʹ͠ͳͯ͘΋͍͍Μ͡Όͳ͍ʁ

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՝୊ʹΞϓϩʔν͢Δ •ίʔυͷ೉͠͞ͱϥΠϒϥϦͷՁ஋͸ؔ܎ͳ͍ ɹ͜Μͳ͠ΐ΅͍ίʔυΛੈʹग़͢ͳΜͯ…