Rackミドルウェア入門のためのRackミドルウェア

3BDLϛυϧ΢ΣΞೖ໳ͷͨΊͷ
3BDLϛυϧ΢ΣΞ
ԘҪඒ࡙!DPF@
%FD
5PLZP(JSMTSC.FFUVQWPM

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ٕज़తʹ੿͍಺༰΋ؚ·Ε͍ͯΔ͔ͱࢥ͍·͢ɻ
օ༷͔Βͷ͝ࢦఠɾ13Λ
͓଴͓ͪͯ͠Γ·͢

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ࣗݾ঺հ
ԘҪඒ࡙!DPF@

8FCϓϩάϥϚGSPNגࣜձࣾΩϟλϧ
5BNBSCɺ"TBLVTBSCɺ'VLVPLBSCʢ࿦ཧʣʹ͍·͢
࠷ۙؾʹͳΔϥΠϒϥϦ͸3BDL

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ࣗݾ঺հ
ԘҪඒ࡙!DPF@

8FCϓϩάϥϚGSPNגࣜձࣾΩϟλϧ
5BNBSCɺ"TBLVTBSCɺ'VLVPLBSCʢ࿦ཧʣʹ͍·͢
࠷ۙؾʹͳΔϥΠϒϥϦ͸3BDL
‐ࠓ೔ͷ͓࿩

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3BDLͬͯԿͰ͚ͨͬ͠ʜʁ
ʢهԱ૕ࣦʣ

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8FCαʔόʔͱ8FCΞϓϦέʔγϣϯΛܨ͙ϓϩτίϧ
8FCαʔόʔͱ8FCΞϓϦέʔγϣϯΛܨ͙ϥΠϒϥϦ
‎3BDLϓϩτίϧΛຬͨͨ͠8FCαʔόʔͱ
‎3BDLϓϩτίϧΛຬͨͨ͠8FCΞϓϦέʔγϣϯؒΛ
‎3BDLϥΠϒϥϦ͕औΓ࣋ͭ
3BDLͱ͸
ը૾ग़యɿIUUQTSVCZPOSBJMTPSH͓ΑͼIUUQTSBDLHJUIVCJP

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8FCαʔόʔͱ8FCΞϓϦέʔγϣϯΛܨ͙ϓϩτίϧ
8FCαʔόʔͱ8FCΞϓϦέʔγϣϯΛܨ͙ϥΠϒϥϦ
‎3BDLϓϩτίϧΛຬͨͨ͠8FCαʔόʔͱ
‎3BDLϓϩτίϧΛຬͨͨ͠8FCΞϓϦέʔγϣϯؒΛ
‎3BDLϥΠϒϥϦ͕औΓ࣋ͭ
3BDLͱ͸
3BDLΞϓϦέʔγϣϯ

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3BDLΞϓϦέʔγϣϯͷ͓࿩
ɹྫ͑͹ɺ3BJMTΞϓϦέʔγϣϯ͔Β
ɹ3BJMTಛ༗ͷॾʑΛશ෦ണ͕͍ͯ͘͠ͱʜ
ɹ

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3BDLΞϓϦέʔγϣϯͷ͓࿩
ɹྫ͑͹ɺ3BJMTΞϓϦέʔγϣϯ͔Β
ɹ3BJMTಛ༗ͷॾʑΛશ෦ണ͕͍ͯ͘͠ͱʜ
ɹ
࠷ޙʹ࢒Δͷ͕ૉͷ3BDLΞϓϦέʔγϣϯ
˞3BJMTҎ֎ͷ3VCZͰॻ͔Εͨ8FCΞϓϦέʔγϣϯϑϨʔϜϫʔΫ΋ಉ༷

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Ұ൪γϯϓϧͳྫ
ɹ3BDLΞϓϦέʔγϣϯ͸ɺ
ɹ8FCΞϓϦέʔγϣϯΛߏ੒͢ΔͨΊʹඞཁͳ
ɹͭͷཁૉΛ࣋ͬͨ഑ྻ͔Β੒Δ
[ 200, { "Content-Type" => "text/plain" }, ["Hello World!\n"] ]
εςʔλείʔυ ϔομ ϘσΟ
3BDLΞϓϦέʔγϣϯͷߏ଄

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Ұ൪γϯϓϧͳྫ
ɹ
ͱ͸͍͑
ɹ࣮ࡍͷ8FCΞϓϦέʔγϣϯ͸
ɹ΋ͬͱ৭ʑෳࡶͳػೳΛ͍࣋ͬͯΔ΋ͷͳͷͰ͸ʜʁ

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Ұ൪γϯϓϧͳྫ
ɹ
ͱ͸͍͑
‎ͦΜͳ࣌͸3BDLϛυϧ΢ΣΞͷग़൪
ɹ࣮ࡍͷ8FCΞϓϦέʔγϣϯ͸
ɹ΋ͬͱ৭ʑෳࡶͳػೳΛ͍࣋ͬͯΔ΋ͷͳͷͰ͸ʜʁ

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3BDLϛυϧ΢ΣΞͱ͸
8FCΞϓϦέʔγϣϯ͕ඞཁͱ͢Δ൚༻తͳػೳΛ
3BDLΞϓϦέʔγϣϯʹ௥Ճ͢ΔͨΊͷ
ϥΠϒϥϦ ͨͪ

ɹɹ˞3BDLϛυϧ΢ΣΞ͸3BDLͷػߏΛར༻͍ͯ͠Δ
ը૾ग़యɿIUUQTSBDLHJUIVCJP
ػೳ
ػೳ
ػೳ

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3BDLϛυϧ΢ΣΞ"
"ػೳΛ௥Ճ
3BDLϛυϧ΢ΣΞ#
#ػೳΛ௥Ճ
3BDLϛυϧ΢ΣΞ$
$ػೳΛ௥Ճ
Α͘ݟΔΠϝʔδਤ
3BDLΞϓϦέʔγϣϯΛத৺ʹɺ
֤3BDLϛυϧ΢ΣΞ͕ͦΕͧΕͷػೳΛ௥Ճ
Α͘ݟΔΠϝʔδਤ
3BDLΞϓϦ3BDLϛυϧ΢ΣΞ‎Ұͭͷ8FCΞϓϦ
ೖΕࢠঢ়ʹͳ͍ͬͯΔ
"
#
$

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3BJMTͷ৔߹
ʜ
Ҿ༻3BJMTΨΠυ3BJMTͱ3BDL"DUJPO%JTQBUDIFSͷϛυϧ΢ΣΞελοΫ
3BJMTΞϓϦέʔγϣϯͰ΋
ଟ͘ͷ3BDLϛυϧ΢ΣΞ͕࢖ΘΕ͍ͯΔ

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ྫ͑͹
ActionDispatch::Cookies
cookieػೳΛఏڙ͠·͢

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ྫ͑͹
ͳΔ΄Ͳʂ
ʢΘ͔Βͳ͍ʣ

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ྫɿ"DUJPO%JTQBUDI$PPLJFTͷ৔߹ɹ
஌ࣝͱͯࣗ͠෼͕஌͍ͬͯΔ͜ͱ
ɹαʔόʔ͸ΫϥΠΞϯτʹରͯ͠
ɹɹϨεϙϯεϔομΛฦ͢
ɹϨεϙϯεϔομʹ͸
ɹɹ$PPLJFͷ໊લͱ஋ؚ͕·Ε͍ͯΔ
Կ͕Θ͔Βͳ͍ͷ͔

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ྫɿ"DUJPO%JTQBUDI$PPLJFTͷ৔߹ɹ
஌ࣝͱͯࣗ͠෼͕஌͍ͬͯΔ͜ͱ
ɹαʔόʔ͸ΫϥΠΞϯτʹରͯ͠
ɹɹϨεϙϯεϔομΛฦ͢
ɹϨεϙϯεϔομʹ͸
ɹɹ$PPLJFͷ໊લͱ஋ؚ͕·Ε͍ͯΔ
Կ͕Θ͔Βͳ͍ͷ͔
‎$PPLJFͷ໊લͱ஋ͱ͸۩ମతʹԿʁ

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஌Γ͍ͨ
޷ح৺

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ͱ͍͏͜ͱͰɺ
͔͜͜Β͕ຊฤͰ͢

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΋͘͡
ɹ3BDLϛυϧ΢ΣΞೖ໳ͷͨΊͷ
ɹ3BDLϛυϧ΢ΣΞ
ᶃ໨తͱ੒Ռ෺
ᶄ࣮૷ํ਑ͱํ๏
ᶅ༗ޮੑͷݕূ

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ɹ3BDLϛυϧ΢ΣΞೖ໳ͷͨΊͷ3BDLϛυϧ΢ΣΞ
ᶃ໨తͱ੒Ռ෺

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໨త
ྫ͑͹
֤3BDLϛυϧ΢ΣΞΛ௨͢લͱ௨ͨ͠ޙͰɺ
ϨεϙϯεϔομʹͲΜͳมߋ͕͋ͬͨͷ͔஌Γ͍ͨ
3BDLϛυϧ΢ΣΞ#Ͱ
ൃੜͨ͠มߋΛ஌Γ͍ͨ
"
#
$

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ର৅ͷ3BDLϛυϧ΢ΣΞΛ௨ͨ͠ޙͷ
ϨεϙϯεϔομͷมԽΛλʔϛφϧʹදࣔ͢Δ
3BDLϛυϧ΢ΣΞ
Λ࡞Γ·ͨ͠
੒Ռ෺

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ͦͷ໊͸
5SBDF)FBEFS
IUUQTHJUIVCDPNTIJPJNNUSBDF@IFBEFS

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ௐ΂͍ͨϛυϧ΢ΣΞʹରͯ͠
5SBDF)FBEFSϛυϧ΢ΣΞΛJOTFSU@CFGPSF͢Δ
class Application < Rails::Application

conﬁg.middleware.insert_before ActionDispatch::Cookies, TraceHeader

end
࢖͍ํ 3BJMTͷ৔߹

DPOpHBQQMJDBUJPOSC

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end
ɹ[Target Middleware]

ɹ ActionDispatch::Cookies

ɹ[New Headers]

ɹ -
ʁʁʁʁ
ௐ΂͍ͨϛυϧ΢ΣΞʹରͯ͠
5SBDF)FBEFSϛυϧ΢ΣΞΛJOTFSU@CFGPSF͢Δ
࢖͍ํ 3BJMTͷ৔߹

λʔϛφϧʹࠩ෼͕දࣔ͞ΕΔ
DPOpHBQQMJDBUJPOSC

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ᶄ࣮૷ํ਑ͱํ๏

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લఏ
3BDLΞϓϦέʔγϣϯͱ3BDLϛυϧ΢ΣΞ͸ɺ
ڞ௨ͷن֨ʹԊ࣮ͬͯ૷͞Ε͍ͯΔ
࣮ߦ؀ڥ FOW
ΛҾ਺ʹऔΔΠϯελϯεϝιουDBMMΛ࣮૷͢Δ
3BDLΞϓϦέʔγϣϯͷ৔߹

DBMMϝιου͸
<εςʔλείʔυ \ϔομ^ <ϘσΟ>>
ͷ഑ྻΛฦ͢
3BDLϛυϧ΢ΣΞͷ৔߹

ᶃΠϯελϯεม਺!BQQʹ
ࣗ෼ͷ಺ଆͷΫϥεͷΠϯελϯεΛ࣋ͭ
ᶄDBMMϝιουͷதͰ
!BQQʹରͯ͠DBMMϝιουΛݺͿ
࣍ϖʔδͰ
΋͏গ͠ৄ͘͠
)551Ϩεϙϯε

"
#
$

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3BDLϛυϧ΢ΣΞͷ಺෦ߏ଄ ྫ

ᶄDBMMϝιουͷதͰ
ɹ!BQQʹରͯ͠DBMMϝιουΛݺͿ
‎!BQQ͔ΒฦΓ஋Λड͚औΔ
‎ࣗ෼ࣗ਎ͷฦΓ஋Λ֎ଆͷϛυϧ΢ΣΞʹ౉͢
BQQ"OFX #OFX $OFX 3BDLΞϓϦέʔγϣϯͷΠϯελϯε

"Πϯελϯεͷ!BQQ#Πϯελϯεͷ!BQQ$Πϯελϯεͷ!BQQ
BQQ "
DBMMͷதͰ!BQQ #
DBMM
‎!BQQ #
DBMMͷதͰ!BQQ $
DBMM
‎!BQQ $
DBMMͷதͰ!BQQ 3BDLΞϓϦ
DBMM
ᶃΠϯελϯεม਺!BQQʹࣗ෼ͷ಺ଆͷΫϥεͷΠϯελϯεΛ࣋ͭ
"
#
$

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require 'rack'

require_relative 'sample_middleware'

class SampleApp

def call(env)

[ 200, {"Content-Type" => "text/plain"}, ["Hello World!\n"] ]

end

end

use SampleMiddleware

run SampleApp.new

3BDLΞϓϦέʔγϣϯͷ࣮૷ྫ
഑ྻΛฦ͢
ϛυϧ΢ΣΞΛੵΉ
εςʔλείʔυ ϘσΟ
ϔομ
DPOpHSV

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3BDLϛυϧ΢ΣΞͷ࣮૷ྫ
class SampleMiddleware

def initialize(app)

@app = app

end

def call(env)

status, header, body = @app.call(env)

[ status, header, body ]

end

end

ͦͷଞͷॲཧ
3BDLΞϓϦέʔγϣϯͷฦΓ஋ͱͯ͠
഑ྻΛฦ͢
Πϯελϯεม਺!BQQ Ҿ਺BQQ
͸
಺ଆͷϛυϧ΢ΣΞͷΠϯελϯε
಺ଆͷϛυϧ΢ΣΞͷฦΓ஋Λ
഑ྻͱͯ͠ड͚औΔ
TBNQMF@NJEEMFXBSFSC

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3BDLϛυϧ΢ΣΞͷ಺෦ߏ଄͔ΒΘ͔Δ͜ͱ
$ΠϯελϯεDBMM FOW

‎<εςʔλείʔυ \ϔομ^ <ϘσΟ>>
#ΠϯελϯεDBMM FOW

"ΠϯελϯεDBMM FOW

3BDLϛυϧ΢ΣΞ͸ڞ௨ͷن֨ʹԊ࣮ͬͯ૷͞Ε͍ͯΔ
‎Ͳͷϛυϧ΢ΣΞʹରͯ͠DBMMΛݺΜͰ΋
࠷Լ૚ͷ3BDLΞϓϦέʔγϣϯ·ͰDBMM͞ΕΔ
‎࠷ऴతʹಉ͡ߏ଄ͷ഑ྻ͕ฦΔ
"
#
$

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͔͜͜ΒཱͯͨԾઆ
ର৅ͷϛυϧ΢ΣΞͱͦͷ௚લʹݺ͹Εͨϛυϧ΢ΣΞͷ
DBMMϝιουΛݺͼɺฦΓ஋ಉ࢜Λൺֱ͢Ε͹ྑ͍ͷͰ͸ʁ
$ΠϯελϯεDBMM FOW
‎ $࣌఺ͷฦΓ஋

#ΠϯελϯεDBMM FOW
‎ #࣌఺ͷฦΓ஋

ᶃ#࣌఺ͱ$࣌఺ͷϛυϧ΢ΣΞ
ɹͦΕͧΕͷΠϯελϯεʹͦΕͧΕDBMMΛݺͿ
ᶄͦΕͧΕͷฦΓ஋Λऔಘ͢Δ
ᶅฦΓ஋ಉ࢜ͷࠩ෼Λλʔϛφϧʹग़ྗ͢Δ
࣮૷ํ਑λʔήοτ͕#ͷ৔߹ʜ#͕ݺ͹ΕΔ௚લʹ$͕ݺ͹ΕΔ
"
$
#

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͔͠͠

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՝୊
ྫ͑͹λʔήοτ͕#ͷ৔߹
3BDLΞϓϦέʔγϣϯͷߏ଄্ɺ
ؒʹ͋Δϛυϧ΢ΣΞʹରͯ͠ॲཧΛڬΉ͜ͱ͕Ͱ͖ͳ͍
ᶃ"ͷΠϯελϯεʹରͯ͠DBMM͕ݺ͹ΕΔ
ᶄ࠷Լ૚ͷ3BDLΞϓϦέʔγϣϯ·Ͱ
ɹશͯͷϛυϧ΢ΣΞͷDBMM͕ݺ͹ΕΔ
ᶅ8FCΞϓϦέʔγϣϯͱͯ͠஋͕ฦΔ
ࠓճDBMMΛݺͼ͍ͨ
#࣌఺ͱ$࣌఺Ͱ
ॲཧΛڬΉ͜ͱ͕Ͱ͖ͳ͍
ͭ·Γʜ
ᶃ
ᶄ
ᶅ
"
#
$

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՝୊
"
#
$
"ͷΠϯελϯεʹରͯ͠DBMM͕ݺ͹ΕΔͱ
࠷Լ૚ͷ3BDLΞϓϦέʔγϣϯ·Ͱ
શͯͷϛυϧ΢ΣΞͷDBMM͕ݺ͹ΕΔ
ࠓճDBMMΛݺͼ͍ͨ
#࣌఺ͱ$࣌఺Ͱ
ͭ·Γʜ

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՝୊
"
#
$
"ͷΠϯελϯεʹରͯ͠DBMM͕ݺ͹ΕΔͱ
࠷Լ૚ͷ3BDLΞϓϦέʔγϣϯ·Ͱ
શͯͷϛυϧ΢ΣΞͷDBMM͕ݺ͹ΕΔ
ࠓճDBMMΛݺͼ͍ͨ
#࣌఺ͱ$࣌఺Ͱ
ͭ·Γʜ
5SBDF1PJOUͷग़൪Ͱ͸ʁ

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5SBDF1PJOUͱ͸
ɹϓϩάϥϜ࣮ߦதͷΠϕϯτʹϑοΫͯ͠
ɹԿͰ΋Ͱ͖Δ3VCZͷ૊ΈࠐΈϥΠϒϥϦ
ɹৄࡉ͸ׂѪ
ɹࢀߟهࣄ
ɹDMBTT5SBDF1PJOU
ɹɹIUUQTEPDTSVCZMBOHPSHKBDMBTT5SBDF1PJOUIUNM
3VCZͷվળΛࣗຫ͍ͨ͠
ɹɹIUUQTUFDIMJGFDPPLQBEDPNFOUSZ
ɹ3VCZͷ5SBDF1PJOUʹ͍ͭͯௐ΂ͯΈͨ
ɹɹIUUQTRJJUBDPNTJNBOJUFNT⒎DGF
˞Πϕϯτʜϝιουݺͼग़͠΍Ϧλʔϯɺ
ɹɹɹɹɹɹΫϥεఆٛɺྫ֎ͷൃੜFUD

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Ҏ্Λ౿·͑ͯ
5SBDF)FBEFSͷ࣮૷

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DMBTT5SBDF)FBEFS ‏5SBDF1PJOUΛ࢖༻

ɾࣗ෼ΑΓલʹ࣮ߦ͞Ε͍ͯΔશͯͷϛυϧ΢ΣΞͷ৘ใΛऩू
ɾࣗ෼ͷޙʹ࣮ߦ͞ΕΔϛυϧ΢ΣΞ΁
λʔήοτͷϛυϧ΢ΣΞͷฦΓ஋Λ౉͢ ޙଓͷॲཧͷͨΊ
ɹ
DMBTT3FTVMU
ɾλʔήοτͱɺͦͷ௚લʹ࣮ߦ͞Εͨϛυϧ΢ΣΞͷ
ΠϯελϯεΛநग़ͯ͠DBMMΛ࣮ߦ
ͦΕͧΕͷฦΓ஋Λൺֱ͠ɺࠩ෼Λฦ͢ϝιουΛ࣮૷
NPEVMF%FTDSJCBCMF
ɾλʔϛφϧʹදࣔ͢ΔจࣈྻΛ੔͑ΔPVUQVUϝιουΛ࣮૷
ৄࡉ͸ׂѪ
˞5SBDF)FBEFSࣗ਎͸ΞϓϦέʔγϣϯʹมߋΛՃ͑ͳ͍
5SBDF)FBEFSͷߏ଄

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5SBDF)FBEFSΠϯελϯεͷ!BQQDBMM FOW
Λ࣮ߦ
5SBDF1PJOUΛ࣮ߦ
ɹ‎ࣗ෼ΑΓલͷશͯͷϛυϧ΢ΣΞͷ৘ใΛऩू
NPEVMF%FTDSJCBCMF
DMBTT3FTVMU
DMBTT5SBDF)FBEFS
DMBTT5SBDF)FBEFS
5SBDF)FBEFSͷॲཧͷྲྀΕ
!BQQDBMM FOW
ͷฦΓ஋Λޙଓͷϛυϧ΢ΣΞʹ౉͢
5SBDF)FBEFSΠϯελϯεDBMM FOW
͕ݺ͹ΕΔͱ
ௐ΂͍ͨϛυϧ΢ΣΞͷΠϯελϯεDBMM FOW

ɹ‎ͦΕͧΕͷฦΓ஋Λൺֱ͠ɺࠩ෼Λऔಘ
PVUQVUϝιουͰࠩ෼Λλʔϛφϧʹදࣔ

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࣮૷ DMBTT5SBDF)FBEFS

1 require 'active_support/core_ext'

6 class TraceHeader

7 include Describable

8

9 def initialize(app)

10 @app = app

11 @datas = []

12 @ﬁxed_app = nil

13 end

14

15 def call(env)

16 tracer.enable { @app.call(env) }

17 output(result)

18 @ﬁxed_app

19 end
˞จࣈྻΛ੒ܗ͢Δ
%FTDSJCBCMFPVUQVUϝιουΛ
࢖༻͢ΔͨΊʹJODMVEF
# ...লུ...

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6 class TraceHeader

7 include Describable

8

9 def initialize(app)

10 @app = app

11 @datas = []

12 @ﬁxed_app = nil

13 end

14

15

16

17

18

19
# ...লུ...
!BQQ‎λʔήοτͷϛυϧ΢ΣΞͷΠϯελϯε
!EBUBT‎5SBDF1PJOUͷ࣮ߦ݁ՌΛ֨ೲ͢Δ഑ྻ
!pYFE@BQQ‎!BQQDBMM FOW
ͷฦΓ஋Λ֨ೲ͢Δม਺

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6 class TraceHeader

7

8

9

10

11

12

13

14

15 def call(env)

16 tracer.enable { @app.call(env) }

17 output(result)

18 @ﬁxed_app

19 end
# ...লུ...
ᶃ
ᶄ
ᶅ
ᶃ!BQQDBMM FOW
ΛϑοΫͯ͠5SBDF1PJOUΛ࣮ߦ
ᶄ%FTDSJCBCMFPVUQVUͰ࣮ߦ݁ՌSFTVMUΛλʔϛφϧʹදࣔ
ᶅ!BQQDBMM FOW
ͷฦΓ஋!pYFE@BQQΛ
ᶆޙଓͷϛυϧ΢ΣΞʹ౉͢
˞USBDFS͸5SBDF1PJOUͷΠϯελϯεΛฦ͢ϝιου

View Slide


30 def tracer

31 TracePoint.new(:call, :return) do |tp|

32 if tp.rack_middleware_called?

33 if tp.event.eql?(:call) \

34 && !@datas.find { |op| op[:middleware].eql? tp.defined_class }

35 @datas << { middleware: tp.defined_class,

36 app: tp.self.deep_dup,

37 env: tp.binding.local_variable_get(:env).deep_dup }

38 end

39

40 @fixed_app = tp.return_value if tp.event.eql?(:return)

41 end

42 end

43

44 def result

45 Result.new(@app, @datas)

46 end

47 end
5SBDF1PJOUΛΠϯελϯεԽ
ϝιουݺͼग़͠ͱϦλʔϯ࣌ʹ
ϒϩοΫ಺ͷॲཧΛ࣮ߦ͢Δ

View Slide

30 def tracer



33

34

35

36

37

38

39

40

41 end

42 end

43

44 def result


46 end

47 end

࣮ߦதͷΠϕϯτ͕
3BDLϛυϧ΢ΣΞͷΠϯελϯεʹର͢Δ
DBMMϝιουͷݺͼग़͠PSϦλʔϯ
Ͱ͋Δ৔߹

View Slide

30 def tracer





35

36

37

38

39

40

41

42

43

44 def result


46 end

47 end

·ͩॲཧ͞Ε͍ͯͳ͍3BDLϛυϧ΢ΣΞʹର͢Δ
DBMMϝιουͷݺͼग़͠
Ͱ͋Δ৔߹

View Slide

30 def tracer








38 end

39

40

41 end

42 end

43

44 def result


46 end

47 end
ᶄ
ᶅ

ᶃ
֤ϛυϧ΢ΣΞͷ
ᶃΫϥεᶄΠϯελϯεᶅ࣮ߦ؀ڥ
Λ഑ྻ!EBUBTʹอଘ

View Slide

30 def tracer








38 end

39

40

41 end

42 end

43

44

45

46

47 end
ᶃ
ᶄ
ᶃUQTFMG
DBMMϝιου͕ݺ͹ΕͨΦϒδΣΫτ
‎ͦͷϛυϧ΢ΣΞͷΠϯελϯε
ᶄUQCJOEJOHMPDBM@WBSJBCMF@HFU FOW

DBMMϝιου͕ݺ͹ΕͨίϯςΩετͰ
ఆٛ͞Ε͍ͯΔϩʔΧϧม਺FOW
‎ͦͷϛυϧ΢ΣΞͷDBMM࣮ߦ࣌ͷҾ਺FOW
˞ॏཁ

View Slide

˞ॏཁ
30 def tracer








38 end

39

40

41 end

42 end

43

44

45

46

47 end
ཹҙ఺ᶃ
֤ϛυϧ΢ΣΞͷΠϯελϯεͱҾ਺FOW͸
5SBDF)FBEFSϛυϧ΢ΣΞ
λʔήοτͷϛυϧ΢ΣΞ
λʔήοτͷ௚લͷϛυϧ΢ΣΞ
Ͱಉ͡ΦϒδΣΫτΛࢦ͢

View Slide

˞ॏཁ
30 def tracer








38 end

39

40

41 end

42 end

43

44

45

46

47 end
ཹҙ఺ᶄ
֤ϛυϧ΢ΣΞͷΠϯελϯεͱҾ਺FOW͸
DBMMϝιουʹΑͬͯ
஋͕มߋ͞ΕΔՄೳੑ͕͋Δ

View Slide

˞ॏཁ
30 def tracer








38 end

39

40

41 end

42 end

43

44

45

46

47 end
ཹҙ఺ᶅ
஋͕มߋ͞ΕͨΦϒδΣΫτʹ
࠶౓DBMMϝιουΛݺͿͱʜ
ਖ਼͍͠ฦΓ஋Λฦ͞ͳ͍
ޙଓͷॲཧʹӨڹ͕ग़ΔͳͲ͕ى͜Γ͏Δ
‎յΕΔ

View Slide

˞ॏཁ
30 def tracer








38 end

39

40

41 end

42 end

43

44

45

46

47 end
ճආࡦ
"DUJWF4VQQPSUEFFQ@EVQΛ࢖ͬͯ
σΟʔϓίϐʔΛߦ͏
‎5SBDF)FBEFSϛυϧ΢ΣΞ಺Ͱ
࢖༻͞Ε͍ͯΔΦϒδΣΫτͱ͸
ແؔ܎ͷΦϒδΣΫτͱͯ͠஋Λऔಘ

View Slide


30 def tracer








38 end

39

40 @ﬁxed_app = tp.return_value if tp.event.eql?(:return)

41 end

42 end

43

44

45

46

47 end
DBMMϝιουͷϦλʔϯͰ͋Δ৔߹
‎!BQQDBMM FOW
ͷฦΓ஋Λ!pYFE@BQQʹ୅ೖ

View Slide


30 def tracer








38 end

39

40

41 end

42 end

43

44 def result


46 end

47 end
ࠩ෼Λऔಘ͢ΔͨΊ3FTVMUΫϥεΛΠϯελϯεԽ
!BQQ‎λʔήοτͷϛυϧ΢ΣΞͷΠϯελϯε
!EBUBT‎5SBDF1PJOUͷ࣮ߦ݁ՌΛ֨ೲͨ͠഑ྻ

View Slide

࣮૷ DMBTT3FTVMU

1 class TraceHeader

2 class Result

3 attr_reader :target_app

4

5 def initialize(target_app, datas)

6 @target_app = target_app

7 @target_hash = datas.find { |dt| dt[:middleware].eql?(target_app.class) }

8 @inner_hash = datas[datas.index(target_hash) + 1]

9 end

10

11 def new_headers

12 headers(new_fields)

13 end

14

15 def changed_headers

16 headers(changed_fields)

17 end

18

View Slide

࣮૷ DMBTT3FTVMU

1 class TraceHeader

2 class Result


4





9 end

10

11 def new_headers


13 end

14



17 end

18
!UBSHFU@BQQ‎λʔήοτͷϛυϧ΢ΣΞͷΠϯελϯε
Ҿ਺EBUBT‎5SBDF1PJOUͷ࣮ߦ݁ՌΛ֨ೲͨ͠഑ྻ
ʲҎԼ͸EBUBT͔Βநग़ʳ
!UBSHFU@IBTI‎λʔήοτͷϛυϧ΢ΣΞͷ৘ใ
!JOOFS@IBTI‎λʔήοτͷ௚લʹݺ͹Εͨ
ϛυϧ΢ΣΞͷ৘ใ

View Slide

࣮૷ DMBTT3FTVMU

1 class TraceHeader

2 class Result


4





9 end

10

11 def new_headers


13 end

14



17 end

18
!UBSHFU@IBTIͱ!JOOFS@IBTIʹ͸
ͦΕͧΕ࣍ͷΑ͏ͳϋογϡ͕֨ೲ͞Ε͍ͯΔ
\NJEEMFXBSFϛυϧ΢ΣΞͷΫϥε
BQQϛυϧ΢ΣΞͷΠϯελϯε
FOWϛυϧ΢ΣΞ࣮ߦ࣌ͷ؀ڥ^

View Slide

࣮૷ DMBTT3FTVMU

1 class TraceHeader

2 class Result


4

32

33 def target_header

34 @target_header ||= rack_app( @target_hash )[1]

35 end

36

37 def prev_header

38 @prev_header ||= rack_app( @inner_hash )[1]

39 end

40

41 def rack_app(hash)

42 hash[:app].call(hash[:env])

43 end

44
ᶃλʔήοτͷϛυϧ΢ΣΞͷ৘ใ
ᶃͱᶄɺ
ͦΕͧΕͷϛυϧ΢ΣΞͷ
Πϯελϯεʹରͯ͠DBMM
ᶄ௚લʹݺ͹Εͨϛυϧ΢ΣΞͷ৘ใ
# ...লུ...

View Slide

࣮૷ DMBTT3FTVMU

1 class TraceHeader

2 class Result


4

32

33 def target_header

34 @target_header ||= rack_app( @target_hash )[1]

35 end

36

37 def prev_header

38 @prev_header ||= rack_app( @inner_hash )[1]

39 end

40

41 def rack_app(hash)

42 hash[:app].call(hash[:env])

43 end

44
# ...লུ...
ฦΓ஋͸ͦΕͧΕ
<εςʔλείʔυ \ϔομ^ <ϘσΟ>>
‎ϔομΛऔಘ͢ΔͨΊʹ
‎ΠϯσοΫε<>Λࢦఆ

View Slide

࣮૷ DMBTT3FTVMU

20

21 def common_fields

22 target_header.keys & prev_header.keys

23 end

24

25 def new_fields

26 target_header.keys - common_fields

27 end

28

29 def changed_fields

30 common_fields.select { |field| target_header[field] != prev_header[field] }

31 end

32

46 def headers(fields)

47 fields.map { |field| { field => target_header[field].to_s } }

48 end

49 end
ϛυϧ΢ΣΞΛ௨ͨ͠લޙͰڞ௨ͷϔομ໊Λநग़
৽͘͠௥Ճ͞Εͨϔομ໊Λநग़
஋͕ॻ͖׵Θͬͨϔομ໊Λநग़
ϔομ໊͔Βϔομͷ஋Λऔಘ
# ...লུ...

View Slide

࣮૷ DMBTT3FTVMU

1 class TraceHeader

2 class Result

3

4

5

6

7

8

9

10

11 def new_headers


13 end

14



17 end

18
औಘͨ͠஋Λ
3FTVMUOFX@IFBEFST ৽͘͠௥Ճ͞Εͨϔομ

3FTVMUDIBOHFE@IFBEFST ஋͕ॻ͖׵Θͬͨϔομ

ͱ࣮ͯ͠૷
‎%FTDSJCBCMFPVUQVUϝιουͰλʔϛφϧʹදࣔ

View Slide

5SBDF)FBEFSΠϯελϯεͷ!BQQDBMM FOW
Λ࣮ߦ
PVUQVUϝιουͰࠩ෼Λλʔϛφϧʹදࣔ
5SBDF1PJOUΛ࣮ߦ
ɹ‎ࣗ෼ΑΓલͷશͯͷϛυϧ΢ΣΞͷ৘ใΛऩू
NPEVMF%FTDSJCBCMF
DMBTT3FTVMU
DMBTT5SBDF)FBEFS
DMBTT5SBDF)FBEFS
5SBDF)FBEFSͷॲཧͷྲྀΕͷ͓͞Β͍
!BQQDBMM FOW
ͷฦΓ஋Λޙଓͷϛυϧ΢ΣΞʹ౉͢
5SBDF)FBEFSΠϯελϯεDBMM FOW
͕ݺ͹ΕΔͱ
ௐ΂͍ͨϛυϧ΢ΣΞͷΠϯελϯεDBMM FOW

ɹ‎ͦΕͧΕͷฦΓ஋Λൺֱ͠ɺࠩ෼Λऔಘ

View Slide

͓ർΕ༷Ͱͨ͠✨

View Slide

ᶅ༗ޮੑͷݕূ

View Slide

"DUJPO%JTQBUDI$PPLJFTΛ௨ͨ͠ޙɺ
৽͘͠௥Ճ͞ΕͨϔομΛλʔϛφϧʹදࣔ͢Δ


end
ݕূ
DPOpHBQQMJDBUJPOSC
ݕূ؀ڥ3VCZ
3BJMT
ɹ4DB⒎PME͚ͨͩ͠ͷ؆୯ͳΞϓϦέʔγϣϯ
ݕূํ๏αʔόʔΛ্ཱͪ͛ͯద౰ͳϖʔδʹΞΫηε

View Slide

ͦͷ݁Ռ

View Slide

݁Ռ ࣮ࡍͷը໘

‎Ͱ͖·ͨ͠

View Slide

----------------------------------------------------

TraceHeader printing...

[Target Middleware]

ActionDispatch::Cookies
[New Headers]

- Set-Cookie: _sampleapp_session=P8jTL8...; path=/; HttpOnly
[Changed Headers]

- ETag: W/"f25d17d6ad73a7091771928fef7cc6f8"
----------------------------------------------------
ϛυϧ΢ΣΞ໊
৽͍͠ϔομͷ໊લͱ஋
஋͕ॻ͖׵Θͬͨϔομͷ໊લͱ஋
݁Ռ ֦େ


View Slide

৽͘͠௥Ճ͞Εͨϔομ4FU$PPLJF
ᶃ@TBNQMFBQQ@TFTTJPO1K5-IUCIPHFIPHFGVHBHVGB
ᶄQBUI
ᶅ)UUQ0OMZ
஋͕มߋ͞Εͨϔομ&5BH
ᶆ8GEEBEBGFGDDG
"DUJPO%JTQBUDI$PPLJFT͕ϔομʹ༩࣮͑ͨࡍͷ஋͔Β
৭ʑͳൃݟ͕͋Γ·ͨ͠
݁Ռ͔ΒಘΒΕͨ΋ͷ
ᶃ஋͸ʮ@ΞϓϦ໊@TFTTJPOϥϯμϜͳӳ਺ࣈʯ
ᶄσϑΥϧτͰQBUIଐੑ͕ϧʔτʹઃఆ͞ΕΔ
ᶅσϑΥϧτͰ)UUQ0OMZʹͳΔ
ᶆ&5BH͸Ͳͷϛυϧ΢ΣΞΛ௨ͯ͠΋ॻ͖׵ΘΔ

View Slide

'VLVPLBSC͔Βͷ͓ͨΑΓ঺հ
CZ!VE[VSB͞Μ
ൃදࢿྉͷϨϏϡʔΛ͓ئ͍ͨ͠'VLVPLBSC͔Β
ײ૝Λ௖͖·ͨ͠ɻ

View Slide

5SBDF)FBEFSͷ༗ޮੑ

View Slide

5SBDF)FBEFSͷ༗ޮੑ
͋Γͦ͏
13͍ͭͰ΋͓଴͓ͪͯ͠Γ·͢
IUUQTHJUIVCDPNTIJPJNNUSBDF@IFBEFS

View Slide

͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠
ɹ4QFDJBM5IBOLT✨
!UEUET͞Μ !LBLVUBOJ͞Μ
!KPLFS͞Μɹ !ZPVDIBO͞Μ
!PLVSBNBTBGVNJ͞Μ !VE[VSB͞Μ
!KJNMPDL͞Μ"TBLVTBSC⚡'VLVPLBSC
ը૾ग़యIUUQTUXJUUFSDPN

View Slide

Rackミドルウェア入門のためのRackミドルウェア

Rackミドルウェア入門のためのRackミドルウェア

Misaki Shioi(塩井美咲/しおい)

More Decks by Misaki Shioi(塩井美咲/しおい)

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