Go初心者がgoroutineで挑んだFTPプロキシ

by ryu

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(Pॳ৺ऀ͕ ༄ɹ௝২(.01FQBCP *OD (PSPVUJOFͰ௅Μͩ '51QSPYZ։ൃ

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༄ɹ௝২!IFBU (.0ϖύϘΠϯϑϥΤϯδχΞ ϦϡɹδϯγΫ

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झຯ͸ंͱ༡Ϳࣄ

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ೖࣾલ࡞ͬͨ΋ͷ

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ϩϦϙοϓʁ ʮࠃ಺࠷େڃͷϨϯλϧαʔόʔαʔϏεʯ

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ϩϦϙοϓʂ ೥݄೔։࢝ ϨϯλϧαʔόαʔϏε ສਓҎ্ͷ͓٬͞Μ ສҎ্ͷαΠτެ։

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ϩϦϙοϓʂͰ࢖͏'51 '51ͷ઀ଓ࣌͸௚઀8FCαʔόͷ1VCMJD*1΁઀ଓ )PTUVTFSTMPMJQPQKQ *1 )PTUVTFSTMPMJQPQKQ *1 )PTUVTFSTMPMJQPQKQ *1 VTFSTMPMJQPQKQ $PNNVOJDBUJPO %BUBUSBOTGFS $MJFOU

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ϩϦϙοϓʂͰ࢖͏'51 8FCαʔόͷσʔλΛҠઃ͢Δͱ σʔλҠઃ $MJFOU

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ϩϦϙοϓʂͰ࢖͏'51 8FCαʔόͷσʔλΛҠઃ͢Δͱ  8FCαʔόΛҠઃͨ͠Β઀ଓઌ΋มΘΔ $PNNVOJDBUJPO %BUBUSBOTGFS VTFSTMPMJQPQKQ $MJFOU

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ͳͥ'51ΛQSPYZ͢Δʁ Ϣʔβͷརศੑ αʔό൪߸Λ೺Ѳ͢Δඞཁͳ͍ Ϧιʔε؅ཧ ଞͷ8FCαʔόʹҠઃͯ͠΋ɺϢʔβʹ઀ଓઌมߋͷ௨஌͕ෆཁ ηΩϡϦςΟʔ 8FCαʔόͷ1VCMJD*1͸ग़དྷΔ͚ͩด͍ͨ͡ υϝΠϯʹߏΘͣ'514͕࢖༻Մೳ

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Q'51঺հ 6TFS*%Λ,FZͱͯ͠઀ଓઌΛ୳͢ ΫϥΠΞϯτ͔Β͸ɺQ'51ࣗମ͕'51αʔόͷΑ͏ʹݟ͑Δ $MJFOU Q'51 $PNNBOE

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Q'51঺հ ̍ηογϣϯ͋ͨΓ̏ͭͷ(PSPVUJOF͕ੜ੒ 64&3\*%^ $NESFBEFS 3FTQPOTFSFBEFS $MJFOUIBOEMFS $POOFDU 3FTQPOTF 3FTQPOTF $PNNBOE $PNNBOE 3FTQPOTF 3FTQPOTF CVpP $PNNVOJDBUJPO

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,FZGFBUVSF $MJFOUͱ'514FSWFSͷύέοτΛಡΉ(PSPVUJOF࣮ߦ

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ॳΧφϦΞϦϦʔε

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ॳΧφϦΞϦϦʔεࣦഊ

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Կ͕໰୊ͩͬͨͷ͔ Q'51͸'51αʔό͔Βͷ3FTQPOTFΛͦͷ··ฦ͢ $NESFBEFS 3FTQPOTFSFBEFS $PNNBOE $PNNBOE 3FTQPOTF 3FTQPOTF CVpP $PNNVOJDBUJPO

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σʔλసૹ͕໰୊ σʔλ઀ଓ͸ΫϥΠΞϯτͱ'51αʔό͕௚ʹ઀ଓ͢Δ࢓૊Έͩͬͨ %BUB$POOFDUUP 1"47SFTQPOTF 1"47SFTQPOTF  $MJFOU Q'51

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'51αʔό͕ 1SJWBUF*1Λฦͯ͠΋઀ଓ͢ΔͨΊ

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ਅ໘໨͗͢Δύλʔϯ ݩ઀ଓ*1ͱσʔλ઀ଓ*1͕ҧ͏৔߹ΤϥʔʹͳΔΫϥΠΞϯτ $MJFOU Q'51 &SSPS

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਌੾͗͢Δύλʔϯ উखʹ઀ଓઌͷ*1Λ੾Γସ͑ΔΫϥΠΞϯτ $MJFOU Q'51 AA΁ߦ͜͏??

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ղܾࡦ͸ʁ σʔλసૹ΋1SPYZ͢Δ సૹϞʔυʹΑͬͯ-JTUFOFS΍%JBMFSΛઃఆͯ͠σʔλΛதܧ %BUB$POOFDUUP 1"47SFTQPOTF 1"47SFTQPOTF  $MJFOU Q'51 %BUB$POOFDUUP

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(PSPVUJOF͕૿͑ͨ σʔλసૹΛॲཧ͢ΔͨΊɺ(PSPVUJOFΛ௥Ճ 1"47 $NESFBEFS 3FTQPOTFSFBEFS $MJFOUIBOEMFS $POOFDU $MJFOUˠ0SJHJO 0SJHJOˡ$MJFOU %BUBIBOEMFS 1"47 $POOFDU 4FUMJTUFOFS

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͓͔͛ͰֶΜٕͩज़ 8SJUFDPOOFDUJPOʹ&P'ΛૹΔํ๏ "DUJWFసૹϞʔυͷͨΊɺTPDLFUSFVTFઃఆํ๏

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Ͳ͔͜-FBLͯ͠Δʁ "MMPDBUFETPDLFU਺͕૿Ճͬ͠ͺͳ͠

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1"47 $POOFDU 1"47 $POOFDU 4FUMJTUFOFS -FBLΛ୳ͦ͏ -FBL͸Ͳ͜Ͱ͠ΐ͏ $NESFBEFS 3FTQPOTFSFBEFS $MJFOUIBOEMFS $MJFOUˠ0SJHJO 0SJHJOˡ$MJFOU %BUBIBOEMFS

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1"47 $POOFDU 1"47 $POOFDU 4FUMJTUFOFS -FBLΛ୳ͦ͏ $MJFOUIBOEMFS $MJFOUˠ0SJHJO 0SJHJOˡ$MJFOU $NESFBEFS %BUBIBOEMFS 3FTQPOTFSFBEFS

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-FBLΛ୳ͦ͏ ෛՙςετ͢Ε͹-FBLൃੜ͕Θ͔Γ΍͍͢

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-FBLΛ୳ͦ͏ -FBLͨ࣌͠ͷϩά͔Β৔ॴΛಛఆ $PNNBOESFBE͕-FBL͢Δ৔߹ͷϩά ਖ਼ৗʹऴྃ͢Δ৔߹ͷϩά

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-FBLΛࢭΊΖʂ

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-FBLΛࢭΊΖʂ -JNJUDMJFOUDPNNBOEVOUJMHFUSFTQPOTF ϨεϙϯεΛฦ͢લʹ΋࣍ͷίϚϯυΛ'51αʔόʹඈ͹͢ࣄ͕Ͱ͖ͨ ͜ΕʹΑͬͯ'51αʔόͷॲཧ͕ϋϯάʹͳΓɺ)BOEMFS͕σουϩοΫঢ়ଶʹͳΔ

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-FBLΛࢭΊΖʂ 'PSMPPQˠ$IBOOFMXBJU 4MFFQͳͲͳ͠ͰGPSMPPQ͠ͳ͕Βঢ়ଶΛ଴ͭίʔυ͸ɺ  ϦιʔεΛٵ͍ࠐΜͰ͠·͏ͷͰϋϯάͷݪҼʹͳΔ

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-FBLΛࢭΊΖʂ $PNNBOEMJOFDIFDL ΫϥΠΞϯτ͕ਖ਼͘͠ͳ͍ίϚϯυΛૹΔ͕࣌͋ͬͨ ͜͏͍͏ίϚϯυΛ'51αʔόʹૹͬͯ͠·͏ͱɺॲཧͰ͖ͣϋϯάʹͳΔ

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#FGPSF /PX ൺֱ

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̎ඖ໨ͷΧφϦΞ

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̍ϲ݄Ҏ্໰୊ͳ͘८ߤத ର৅ΞΧ΢ϯτ ໿ ΞΧ΢ϯτ ಉ࣌઀ଓ ࠷େ໿DPOOFDUJPOT ̍೔઀ଓ਺ ໿ DPOOFDUJPOT

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·ͩ·ͩमਖ਼த ࠓ΋#VH΍-FBLͳͲ͕ݟ͚ͭΒΕΔͷͰɺ13ఏग़͠ͳ͕ΒରԠத

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సૹϞʔυผ࣮૷ Q'51UP'51αʔόͷసૹϞʔυ͸ݸผઃఆՄೳ ͜ΕʹΑͬͯɺҎԼͷ̐ͭͷ઀ଓέʔε͕ग़དྷΔ "DUJWF5P"DUJWF4FUEJBMFSGPSDMJFOU MJTUFOFSGPSPSJHJO "DUJWF5P1BTTJWF4FUEJBMFSGPSDMJFOUBOEPSJHJO 1BTTJWF5P"DUJWF4FUMJTUFOFSGPSDMJFOUBOEPSJHJO 1BTTJWF501BTTJWF4FUMJTUFOFSGPSDMJFOU EJBMFSGPSPSJHJO