3789 lines
768 KiB
Plaintext
3789 lines
768 KiB
Plaintext
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rust
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„ÿ #rustc 1.96.0 (ac68faa20 2026-05-25)ÁÀ뉊 ]!ÜÛê(¹Þ—šên -5be7b69c3ff7b5b8Á íàÄTËŸ ÜJîÄ)'ß\¥! -3d1337db07d0b3aeÁ ¤²XctÔ'ÐÓ©z¨É½Ó -a4945860e1c53b00Á ¤°ð ¾ä-±($²ï=©Ã -7e98a21bfd32b0edÁ–�òÖÀH•‘P IÓHã#£ -055f30b747f859b6Á rustc_std_workspace_coreÁCçß^ò½èÝ$Çÿ+Cé -c4878ee60b2242c9Á ŸÃï+Ñ]ŠqB<ÏïW# -8dd1dd90e70d0b6aÁ miniz_oxideÁ€š»J(P>àö÷g\K -1eb618da2918ab7fÁ adler2ÁÆ;+Þ®5¥ÌýÝ°¦ÛLˆ -f7919172d268e069Á hashbrownÁPäV9ÒÆèÜ�"ÊÖVŽ\ -0fc2184a5da6723aÁ rustc_std_workspace_allocÁs&ØòØy¯s•bæ!‰ýŠ -97e4bf30be240674Á
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std_detectÁhŠBîÙºÌI®Ë�Å�š -9dbbf8346ba7ac8bÁ rustc_demangleÁûë9´Ç×@Œ�’ùXFº -f33013f239bf9f14Á cfg_ifÁÜLh�ž§Œaã¯>� -0a71c8f33a838301Á addr2lineÁ׎Þ!]8V$É@@T· -e618e6be60e87ba2Á gimliÁ¸
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°µ~Î1‹Ñt ðÁ€w -1f7768a68858f670Á objectÁ
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áPÃ?À¶¼QHJ¥� -914cd6a4dbe590d1Á memchrÁ›º«8Ór2Ù $¨ûib‚ -cf21ca6f2bb15dcdÁ ë
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‹ás «LÖ€îâƒ×ɯŒ -ee6f3747e38367f0Á tokioÁJ;Ì3‹<þÝñŠ7_�ú -081d57d1ceb823d6Á pin_project_liteÁ·x¼+Ä`·á¨›�t—¸Íœ -2dc344ecc91b59efÁ parking_lotÁâ°r4¨6ª(ü²Hd©n¼ -21962aa896c8619bÁ lock_apiÁEcÓŽ/ÅS}sw‡A$P -0e8055cd433fa267Á
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scopeguardÁ’‰‘p ÒÞa¢ßöéqÓB -29f0bdb2ea82739eÁ parking_lot_coreÁ’Ý%Ž=Eq^U4FOV)àŸ -e1ee0517e8b9a4bfÁ smallvecÁ[“S‰«2ûÓàÁ3™ËºS -fa382cf08413422fÁ serdeÁFV æ¸Û•IÄÀz Í -9c8ce3cf08540cc3Á serde_deriveÁ,w|êñ]ù¿¥C£ð -975c43f96d83014eÁ
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serde_coreÁ²€Ãb˜ cÐòÅ�¾ÇÇ
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-7a42419d8e43b208Á ®f©¾/ô)c§{õa“â‘ -a3906971a93fd1b8Á –æ\‹±Ôcd�-»ùÀTƒ -f86f80b348d33b13Á mioÁGù�j0ðÔ·â"FÆ#0Q -3545320490828222Á bytesÁ�`²['3_ ²µÆ=üå¥ -d4f44708ed5da7b6Á tokio_macrosÁóÁm¹^E�¼>ŽCê
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z3 -074a4ab5bbda1a72Á socket2ÁsT›¸n>~R�Ê1G/R -c161f09f0083d1e0Á signal_hook_registryÁœ¥¿’g›´·D V<{Y<< -b3ea108dcb9d0adeÁ errnoÁÍ\Ý| #{°zŽ¡p&a” -464950f23d45b34dÁ
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tower_serviceÁ:`¡{¶aÛ¬í"aô -3b2010b03e380b78Á tower_layerÁX*�ø6êWHNᕈf§ • -ee72e88a461fccddÁ futures_coreÁÆöc$Ž³–º¾v¸dK -ac1e9cdb826f83c0Á futures_utilÁNdpµÙærC˜ÊÉíNá -c6fee091c887f5ffÁ futures_taskÁÀð‘ô Rî-Ø¡±ê¹ -b68ad6d97da04350Á futures_sinkÁL 1Tš½‰¤
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Èþ. -14e3b8a05e30b9eeÁ slabÁ³=E–¿Ü;Ö¾t›,)ã( -82737aed38d266b2Á
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futures_ioÁTo«�Š§ JíZu\Ȩ -94612345b0215f77Á 솰<šÒ"®9eæ·3š¶Ø -809318e8f6183885Á sync_wrapperÁTÃ@Oø~:åÍžêƒE¦« -fb4745e3f4df95dbÁ balanceÁ<»9 »¼œ�9 bufferÁ4ç9 »Ù”Ê9 discoverÁD”: »õ¤õ9 filterÁ4Á: »“”¤: hedgeÁ,ë: »¯ŒÏ: limitÁ,”; »ÊŒø: ¬$¼; »¬„¡; load_shedÁLè; » load-shedÁ¬È; + testsÁ,û‚ $ð ready_cacheÁ\Ã< » ready-cacheÁ¼¡< reconnectÁLö< »ç¬Ö< �£,™0‚ $Ž0°£,×1‚ $Ì1÷ _obj_safeÁLì‚ $â spawn_readyÁ\Ò= » spawn-readyÁ¼°= steerÁ,�> »÷Œå= Ú£,‡,‚ $ü+€
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sample_floyd2Álß»¼œ»€
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£,÷ ‚ $ì À macrosÁ
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opaque_futureÁ makeÁ make_connectionÁ MakeConnectionÁ å
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ConnectionÁ ErrorÁ FutureÁ
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poll_readyÁ š ¤ å ” å ð � � š š make_serviceÁ " """""""" sharedÁ + +++++ 1¤ 1æ +4¤ 4¥ 4 ResponseÁ 4� 4� 4š 4Ñ " MakeServiceÁ <å < RequestÁ <ñ <� < ServiceÁ < MakeErrorÁ <� <š <ù < into_serviceÁ <
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as_serviceÁ " Hž H¤ Hå Hµ "Mž M¤ Må Mµ Mñ M� MÑ Mß M� Mš Mù " IntoServiceÁ Yž Yµ Y� Y _markerÁ "^ž ^µ ^ƒ "bž bµ b× "fž f¤ få fµ fñ f� f� fš fÑ " AsServiceÁ p 'aÁ pž pµ p� pÀ "vž vµ v× "zž z¤ zå zµ zñ z� z� zš zÑ futureÁ Š retryÁ Œ backoffÁ � ������� MakeBackoffÁ • BackoffÁ • make_backoffÁ �Ð ˜� ˜ next_backoffÁ � ›£ ›æ �ž£ žÐ žß �¢£ ¢ baseÁ ¢ jitterÁ �¦£ ¦� ¦ƒ �ª> �¬× �Œ budgetÁ ¯
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tps_budgetÁ ° °°°°°°°°° ° TpsBudgetÁ »
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generationÁ » reserveÁ » slotsÁ » windowÁ » writerÁ » deposit_amountÁ » withdraw_amountÁ ° Ãæ à expireÁ à sumÁ Æ Ã putÁ à try_getÁ °Ê depositÁ Ê withdrawÁ °Í> °Ï× ¯ ¯ BudgetÁ ÒÏ# ÒÞ# Œì Õ ÕÕÕÕÕÕÕÕÕ Õ
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Õ á¡ á¤ áµ áæ Õæ¡ æ¤ æµ æ° æŠ Œ layerÁ ì ìì ï¡ ïæ ìò¡ ò¤ òÑ ò»% Œ policyÁ ÷ ÷ PolicyÁ ù ReqÁ ù ResÁ ù– ù� ùþ ù
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clone_requestÁ Œ ŒŒŒŒŒŒŒŒ ˆ¡ ˆ¤ ˆæ ˆ get_refÁ ˆ get_mutÁ ˆ
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into_innerÁ Œ�¡ �¤ �µ �ñ �� �� �š �Ñ timeoutÁ ˜ errorÁ ™ ™™™ �æ ™Ÿ× ™˜ì ¢ ¢¢¢¢¢¢¢¢¢ ¬¥ ¬æ ¢¯— ¯¥ ¯– ¯° ¯Š ˜»% µ µµµ ¹æ µ»¤ »Ñ »»% ˜ ˜˜˜˜˜˜˜ Æ¥ Ææ Ƶ' ÆÄ' ÆÓ' ˜Ì¤ ̵ Ìñ Ì� Ì� Ìš ÌÑ utilÁ Ô¶ Õ ÕÕÕÕÕÕÕÕÕ Õ
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Õ Õ â¤ â— â× Õæ F1Á æ F2Á æŸ ææ Õë©, ë³, ëŸ ë× Õð©, ð³, ðŸ ð° ðŠ Õö¤ ö— öæ ö»% Õû¤ û— ûµ û FutÁ ûñ û� û� ûš ûÑ Õ…— …æ Õˆ¤ ˆ— ˆÑ ˆ»% Ô boxedÁ �»% Ž ŽŽŽŽŽŽŽŽ BoxLayerÁ — InÁ —¥ —¦ —– —Î. Ž �›/ �¥ �¦ �– �æ ¢� ¢ Ž¥›/ ¥¥ ¥¦ ¥– ¥Ñ ¥»% Ž¬›/ ¬¥ ¬¦ ¬– ¬ƒ Ž²›/ ²¥ ²¦ ²– ²× � layer_cloneÁ ¸ ¸¸¸¸¸¸¸¸ BoxCloneServiceLayerÁ Á›/ Á¥ Á¦ Á– ÁÎ. ¸ Ç›/ Ç¥ Ǧ Ç– Çæ Ì� Ì ¸Ï›/ Ï¥ Ϧ Ï– ÏÑ Ï»% ¸Ö›/ Ö¥ Ö¦ Ö– Öƒ ¸Ü›/ Ü¥ ܦ Ü– Ü× � layer_clone_syncÁ â ââââââââ BoxCloneSyncServiceLayerÁ ë›/ ë¥ ë¦ ë– ëÎ. â ñ›/ ñ¥ ñ¦ ñ– ñæ ö� ö âù›/ ù¥ ù¦ ù– ùÑ ù»% ‛/ €¥ €¦ €– €ƒ ↛/ †¥ †¦ †– †× �ç Œ ŒŒŒŒŒŒŒŒŒ Œ
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Œ Œ Œ
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BoxServiceÁ š¥ š¦ š– š innerÁ Œ BoxFutureÁ Ÿ¥ Ÿ– Œ ¢¥ ¢¦ ¢– ¢æ ¦¤ ¦ ¢»% ©¤ Œ«¥ «¦ «– «ñ «� «� «š «Ñ Œ´¥ ´¦ ´– ´× � unsyncÁ ¹ ¹¹¹¹¹¹¹¹¹ ¹
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¹ UnsyncBoxServiceÁ Å¥ Ŧ Å– Åš7 ¹ UnsyncBoxFutureÁ Ê¥ Ê– ¹ Í¥ ͦ Í– Íæ Ѥ Í»% Ó¤ ¹Õ¥ Õ¦ Õ– Õñ Õ� Õ� Õš ÕÑ ¹Þ¥ Þ¦ Þ– Þ× ¹ã¤ ãµ ãñ ã� ã� ãš ãÑ � �����Ô boxed_cloneÁ ñ ñññññññññ ñ
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ñ BoxCloneServiceÁ ý
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ý¥ ý¦ ý– ýˆ ñ ƒ¥ ƒ¦ ƒ– ƒæ ‡¤ ‡ ƒ»% Š¤ ñŒ¥ Œ¦ Œ– Œñ Œ� Œ� Œš ŒÑ ñ•¥ •¦ •– •ƒ ñ CloneServiceÁ š£ š clone_boxÁ ñ�£ �¥ �è> ñ¡¥ ¡¦ ¡– ¡× Ô boxed_clone_syncÁ ¦ ¦¦¦¦¦¦¦¦¦ ¦
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¦ BoxCloneSyncServiceÁ ²
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²¥ ²¦ ²– ²ˆ ¦ ¸¥ ¸¦ ¸– ¸æ ¼¤ ¼ ¸»% ¿¤ ¦Á¥ Á¦ Á– Áñ Á� Á� Áš ÁÑ ¦Ê¥ ʦ Ê– ʃ ¦Ì> Ï£ Ïè> ¦Ò£ Ò¥ Òè> ¦Ö¥ Ö¦ Ö– Ö× Ô call_allÁ Ûž Ü ÜÜÜÜÜÜÜÜÜ Ü
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Ü è SvcÁ è¤ è¢ è× Ü DriveÁ í— í is_emptyÁ í pushÁ íŠ Üò¤C ò¤ ò¢ òæ òÓ' ò take_serviceÁ ò unorderedÁ Üú¤C ú¤ ú¢ ú› ú poll_nextÁ Û orderedÁ € €€€€€€€€€ €
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€ Œ¤C Œ¤ Œæ ŒÓ' ŒD ŒÁD €“¤C “¤ “› “÷D €˜— ˜ÜC ˜ìC ˜Š ÛÁD � ��������� �
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� ©¤C ©¤ ©æ ©Ó' ©D �¯¤C ¯¤ ¯› ¯÷D �´— ´ÜC ´ìC ´Š Û ÛÛÔ eitherÁ ¼ ¼¼¼¼¼¼¼¼¼ Æ’ Æ“ Ƶ Æñ Æ� Æ� Æš ÆÑ ¼Ï’ Ï“ Ï° ÏŠ ¼Ô¤ Ô’ Ô“ ÔÑ Ô»% Ô future_serviceÁ Ú ÚÚÚÚÚÚÚÚäI ã— ã¤ ã£ ã– Ú è— è¤ èæ Úì— ì¤ ì× Úð— ð¤ ð× Úô— ô¤ ô£ ô– ôñ ô� ô� ôš ôÑ ÔÙ þ þþþþþþþþþ ˆ¤ ˆ— ˆ× þŒ¤ Œ— Œæ Œ»% þ‘¤ ‘— ‘µ ‘� ‘ñ ‘�‘� ‘š ‘Ñ þ›— ›æ þž¤ ž— žÑ ž»% Ô map_requestÁ £ ££££££ ª¤ ª— ª× £®¤ ®— ®æ ®»% £³¤ ³— ³ R1Á ³ R2Á ³ñ ³� ³� ³š ³Ñ £½— ½æ £À¤ À— ÀÑ À»% Ô map_responseÁ Å ÅÅÅÅÅÅÅÅŠϤ Ï— Ï× ÅÓ¤ Ó— Óæ Ó»% Åؤ Ø— ص Øñ ØñØ� Ø� Øš ØÑ Åâ— âæ Åå¤ å— åÑ å»% Ô
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map_resultÁ ê êêêêêêêêê ô¤ ô— ô× êø¤ ø— øæ ø»% êý¤ ý— ýµ ýñ ý� ýñý�ý� ýš ýÑ êˆ— ˆæ ꋤ ‹— ‹Ñ ‹»% Ô
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map_futureÁ � �������� ™¤ ™— ™æ ™»% ™µ' ™Ä' ™Ó' �¡£ ¡¤ ¡— ¡¥ ¡– ¡á- ¡ñ ¡� ¡� ¡š ¡Ñ �¤ — × �±— ±æ �´¤ ´— ´Ñ ´»% �¹— ¹× Ô oneshotÁ ¼ ¼¼¼¼¼¼¼¼¼ ¼ Ǥ Ç& Ç not_readyÁ Ç calledÁ ¼Ì¤ Ì& Ì× ¼Ð¤ Ð& Ðæ ¼Ô¤ Ô& Ô° ÔŠ Ô optionalÁ Ù¸( Ú ÚÚÚ Þæ Úà× ÚÙì ã ãããããããã ì¥ ìæ ãï— ï¥ ï– ï° ïŠ Ù ÙÙÙÙÙ ú¥ úæ üµ Ùþ¥ þµ þñ þ� þ� þš þÑ … Ô readyÁ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
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‡ ReadyOneshotÁ “ ¥ “ µ “ š7 “ _pÁ ‡ ˜ ¥ ˜ µ ‡ › ¥ › µ › æ ‡ Ÿ ¥ Ÿ µ Ÿ ° Ÿ Š ‡ ¤ ¥ ¤ µ ¤ × ‡ È ¨
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¨ Ó ¨ ¥ ¨ µ ¨ ˆ ‡ ® ¥ ® µ ‡ ± Ó ± ¥ ± µ ± æ ‡ ¶ Ó ¶ ¥ ¶ µ ¶ ° ¶ Š ‡ ¼ ¥ ¼ µ ¼ × Ô
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service_fnÁ À À À À À À À ç] Ç ¥ À É ¥ É × À Ì ¥ Ì — Ì µ Ì £ Ì – Ì ñ Ì � Ì � Ì š Ì Ñ Ô thenÁ × × × × × × × × × × ×
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× ã ¤ ã — ã × × ç ¤ ç — ç æ ç »% × ì ¤ ì — ì µ ì ñ ì � ì á- ì ñì �ì � ì š ì Ñ × ø — ø æ × û ¤ û — û Ñ û »% Ô rngÁ €
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€
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€
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€
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€
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€
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€
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RngÁ ‡
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next_u64Á ‡
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next_f64Á ‡
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next_rangeÁ €
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‹
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£ ‹
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áa €
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Ž
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æ €
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with_hasherÁ €
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áa Ô ÔÔÔÔÔÔÔÔÔ Ô
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Ô Ô Ô
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Ôì É
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Ô
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ServiceExtÁ Ñ
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µ Ñ
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ÈZ Ñ
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ready_oneshotÁ Ñ
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ÄV Ñ
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ÐB Ö
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¤ Ñ
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¶ Ø
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êO Ú
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ìM ä
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NewRequestÁ Ñ
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‘_ ç
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ñ ç
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á- Ñ
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Î. Ñ
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š< Ô ó
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¥ ó
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µ Ô option_layerÁ ö
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� builderÁ ø
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ø
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� æ ø
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ƒ � ƒ »% … ¥ ƒ ßg ‡ ¥ ƒ layer_fnÁ ‰ — ƒ þ ‹ ¡ ƒ ©( ƒ ìM Ž — Ž ôN Ž þN ƒ êO ’ — ƒ Ù ” — ƒ „T – — ƒ ‘_ ˜ — ƒ ¶ š — ƒ ôQ œ — ƒ Ó' ƒ serviceÁ Ÿ ¤ ƒ ç] ¡ — ƒ check_cloneÁ ƒ check_service_cloneÁ ¤ ¤ ƒ
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check_serviceÁ ¦ ¤ ¦ ¥ ¦ ¦ ¦ – ƒ Î. « ¤ « £ ƒ š< ® ¤ ® £ ƒ »? ± ¤ ± £ ø
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´ � ´ × ø
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· ¤ · � · Ñ · »% »% ¼ ¼ ¼ ¼ ¼ ·+ Á Á Á sealedÁ Ì SealedÁ Í ¥ BoxErrorÁ + SharedÁ Ð ¤ Ð ¥j +Ó ¤ Ó × +Ö ¤ Ö ƒ +Ù ¤ +Û ¤ Û æ +Þ ¤ Þ × +á ¤ á ° á Š + SharedFutureÁ å ¤ å š7 + è é ¤ è __assert_not_repr_packedÁ ë ¤ è
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ProjectionÁ í '__pinÁ í ¤ í š7 è
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ProjectionRefÁ ñ ¾o ñ ¤ ñ š7 é projectÁ õ ¾o é project_refÁ ÷ ¾o è __OriginÁ ù ¾o ù ¤ ù __dummy_lifetimeÁ ù š7 è þ ¾o þ ¤ è MustNotImplDropÁ è ‚ ¥ è „ ¤ � ExponentialBackoffMakerÁ † £ † minÁ † maxÁ † â † a �Œ £ Œ × �� £ � ƒ � ExponentialBackoffÁ ’ £ ’ èq ’ óq ’ â ’ a ’
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iterationsÁ � ™ £ ™ × �
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œ £ œ ƒ � InvalidBackoffÁ Ÿ
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Ÿ ˆ � ¢ × °
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GenerationÁ ¤ Ö ¤ timeÁ °§ × Õ ResponseFutureÁ © ¡ © ¤ © µ © requestÁ © þ © º Õ° ¡ ° ¤ ° µ ° × Õ µ ¶ ¡ ¶ ¤ ¶ µ µ „o º ¡ º ¤ º µ µ ¬o ¾ ¾o ¾ ¡ ¾ ¤ ¾ µ ¾ Çt ¾ þ ¾ º µ Üo Æ ¾o Æ ¡ Æ ¤ Æ µ Æ Çt Æ þ Æ º ¶ ‰p Î ¾o ¶ p Ð ¾o µ »p Ò ¾o Ò ¡ Ò ¤ Ò µ Ò Ûp Ò Çt Ò þ Ò º µ Û ¾o Û ¡ Û ¤ Û µ µ �q µ á ¥ µ ã ¡ ã ¤ ã µ Õ StateÁ ç — ç ¡ ç CalledÁ ê ì ç WaitingÁ ì waitingÁ ç RetryingÁ î
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Ç ê·t¬@ Ö È œ\ªA < É ‰ LayerÁ,ÜA 'Ú Ê Ñ<ŠB & Ë ü ‡D üÌ2 / `async fn(Request) -> Result<Response, Error>`Á ÿ ú tƒ # OverviewÁ ’ ú ü–F C Tower is a library of modular and reusable components for buildingÁ üÝ* ' robust networking clients and servers.Á ˆ ú üŒJ G Tower provides a simple core abstraction, the [`Service`] trait, whichÁ ü×O L represents an asynchronous function taking a request and returning either aÁ ü§P M response or an error. This abstraction can be used to model both clients andÁ dø servers.Á … ú ü‰P M Generic components, like [`timeout`], [rate limiting], and [load balancing],Á üÚI F can be modeled as [`Service`]s that wrap some inner service and applyÁ ü¤P M additional behavior before or after the inner service is called. This allowsÁ üõT Q implementing these components in a protocol-agnostic, composable way. Typically,Á üÊ2 / such services are referred to as _middleware_.Á ý ú ü� F C An additional abstraction, the [`Layer`] trait, is used to composeÁ üÈ J G middleware with [`Service`]s. If a [`Service`] can be thought of as anÁ ü“
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O L Since the [`Service`] and [`Layer`] traits are important integration pointsÁ üÃK H for all libraries using Tower, they are kept as stable as possible, andÁ ü�M J breaking changes are made rarely. Therefore, they are defined in separateÁ üÝF C crates, [`tower-service`] and [`tower-layer`]. This crate containsÁ ü¤E B re-exports of those core traits, implementations of commonly-usedÁ üêM J middleware, and [utilities] for working with [`Service`]s and [`Layer`]s.Á ü¸O L Finally, the [`tower-test`] crate provides tools for testing programs usingÁ Tˆ Tower.Á “ ú \— # UsageÁ £ ú ü§O L Tower provides an abstraction layer, and generic implementations of variousÁ ü÷O L middleware. This means that the `tower` crate on its own does *not* provideÁ üÇL I a working implementation of a network client or server. Instead, Tower'sÁ ü”F C [`Service` trait][`Service`] provides an integration point betweenÁ üÛI F application code, libraries providing middleware implementations, andÁ ü¥G D libraries that implement servers and/or clients for various networkÁ tí protocols.Á ü ú ü€O L Depending on your particular use case, you might use Tower in several ways:Á Ð ú üÔK H * **Implementing application logic** for a networked program. You mightÁ ü M J use the [`Service`] trait to model your application's behavior, and useÁ üîN K the middleware [provided by this crate](#modules) and by other librariesÁ ü½I F to add functionality to clients and servers provided by one or moreÁ ü‡ protocol implementations.Á ü§O L * **Implementing middleware** to add custom behavior to network clients andÁ ü÷L I servers in a reusable manner. This might be general-purpose middlewareÁ üÄO L (and if it is, please consider releasing your middleware as a library forÁ ü”K H other Tower users!) or application-specific behavior that needs to beÁ üà1 . shared between multiple clients or servers.Á ü’ K H * **Implementing a network protocol**. Libraries that implement networkÁ üÞ G D protocols (such as HTTP) can depend on `tower-service` to use theÁ ü¦ M J [`Service`] trait as an integration point between the protocol and userÁ üô P M code. For example, a client for some protocol might implement [`Service`],Á üÅ H E allowing users to add arbitrary Tower middleware to those clients.Á üŽ L I Similarly, a server might be created from a user-provided [`Service`].Á Û ú üß J G Additionally, when a network protocol requires functionality alreadyÁ üª P M provided by existing Tower middleware, a protocol implementation might useÁ üû F C Tower middleware internally, as well as as an integration point.Á Â! ú ´Æ! ## Library SupportÁ Ý! ú üá!N K A number of third-party libraries support Tower and the [`Service`] trait.Á ü°": 7 The following is an incomplete list of such libraries:Á ë" ú üï"B ? * [`hyper`]: A fast and correct low-level HTTP implementation.Á ü²#J G * [`tonic`]: A [gRPC-over-HTTP/2][grpc] implementation built on top ofÁ üý#P M [`hyper`]. See [here][tonic-examples] for examples of using [`tonic`] withÁ dÎ$ Tower.Á üÛ$< 9 * [`warp`]: A lightweight, composable web framework. SeeÁ ü˜%D A [here][warp-service] for details on using [`warp`] with Tower.Á üÝ%5 2 * [`tower-lsp`]: implementations of the [LanguageÁ ü“&+ ( Serv
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;¯Ë¥Ì$å _targetÁ<ëüÛA ü�# Creates new [`Service`] values.Á ± ú üµM J Acts as a service factory. This is useful for cases where new [`Service`]Á üƒL I values must be produced. One case is a TCP server listener. The listenerÁ üÐF C accepts new TCP streams, obtains a new [`Service`] value using theÁ ü—Q N [`MakeService`] trait, and uses that new [`Service`] value to process inboundÁ üé$ ! requests on that new TCP stream.Á Ž ú ü’H E This is essentially a trait alias for a [`Service`] of [`Service`]s.Á \å < å = µ > = > < ÿµüÛÓ Í ‡¶·ËÊÏ Ìƒ §¶4ñ ÍìÊÏ <ù < ÿµK îÕ6 ÿµW îÕB?@ABCDEFG?@ABCDEFG Í쇶·ËÊÏ ? tÊ ÚÖ Í쇶·ËÊÏ @ \… €× Í쇶·ËÊÏ A üÌO &®×ÊÏ üÚ@ ®×ÊÏ& âÖÌë ®×ÊÏ&
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# async {Á ´ø // A `MakeService`Á ü“8 5 let make_service = service_fn(|make_req: ()| async {Á üÐ< 9 Ok::<_, Infallible>(service_fn(|req: String| async {Á ü‘$ ! Ok::<_, Infallible>(req)Á \º }))Á <Ê });Á Ö ú üÞ1 . // Convert the `MakeService` into a `Service`Á ü”. + let mut svc = make_service.into_service();Á Ç ú ÌÏ // Make a new serviceÁ üí2 / let mut new_svc = svc.call(()).await.unwrap();Á ¤ ú ¼¬ // Call the serviceÁ üÈ= : let res = new_svc.call("foo".to_string()).await.unwrap();Á DŠ # };Á <— # }Á <£ š�d² ‡¶ Y Y ™ \� " ]À " â!1Ã_N‡¶ÊÏ < < Í쇶 ,û
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F‡¶·ËÊÏ$¿ üñ W üíc ` Convert this [`MakeService`] into a [`Service`] without consuming the original [`MakeService`].Á Õ ú lÝ åä <ï š� üû! ‰å ¼¡ ³å ü½! Ôå Ôã þå ‚ ú ŒŠ æ l Çæ ´² Ýæ üÍ< 9 let mut make_service = service_fn(|make_req: ()| async {Á üŽ< ¿ç üÏ$ …è \ø ²è <ˆ Æè ” ú üœ1 ãè üÒ, ) let mut svc = make_service.as_service();Á ƒ ú Ì‹ áé ü© 2 „ê à ú ¼è Ëê ü„ = ìê Æ ú üÎ 5 2 // The original `MakeService` is still accessibleÁ üˆ ? < let new_svc = make_service.make_service(()).await.unwrap();Á DÌ ²ë <Ù Ãë <å š�Tô ì 쇶 p p à t� " uÀ " z2[QDÀ¡ 쇶ÊÏ < ÿ < Áí,Â
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€Ÿ&4° ù �™ttË © Œ ‚ˆ�\ñ Œ ƒk<Ž Ì� Œ …·$— œØ Œ †Ñ<± & Œ ‡|0 ü N K This module contains generic [backoff] utilities to be used with the retryÁ TO layer.Á Zú ü^M J The [`Backoff`] trait is a generic way to represent backoffs that can useÁ œ¬ any timer type.Á Àú üÄ? < [`ExponentialBackoffMaker`] implements the maker type for Á ü„N K [`ExponentialBackoff`] which implements the [`Backoff`] trait and providesÁ üÓA > a batteries included exponential backoff and jitter strategy.Á •ú ü™@ = [backoff]: https://en.wikipedia.org/wiki/Exponential_backoffÁ <8 •˜† ’ Ÿ t<é Äc � Ž�4ƒ ‚Ø � �ý¤Dš Ö � �€t$¯ Ãc � ‘Š·LÍ Ì � “Öa Ø ‡
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� ”Œßƒœötœ�c\¨S„ºCE24¬› üß; 8 Trait used to construct [`Backoff`] trait implementors.Á \¥ • • ÿµü›¾ • ÿµ ÿµ –—–— Í쇶 – ´è ˜–¤ <ö Ž¤ ¦¤ — ¬è ü·, ) The backoff type produced by this maker.Á<í • • ü«, ü„" Constructs a new backoff type.Ád® ‚ ‚‡¶–¤ • » •
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—‡¶$ÀŒµ üÛH E A backoff trait where a single mutable reference represents a singleÁ ü¤J G backoff session. Implementors must also implement [`Clone`] which willÁ üïE B reset the backoff back to the default state for the next session.Á <¿ ˜ ˜ ÿµüµ� ˜ ÿµ ÿµ ™š™š Í쇶 ™ ü¯ ! ‚Øè¨ œ¼ è¨ƒØ \à à¨- ù¨! Š© š ü¯ üÍK H The future associated with each backoff. This usually will be some sortÁ l�
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øÐ µ¦Ð� ü¸� üÀ& # Create a new `ExponentialBackoff`.Á ëú \ó # ErrorÁ ƒú ü‹) & Returns a config validation error if:Á œ¹ - `min` > `max`Á „Ñ
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$ã.± é.üÚ/) ùÓ tA ü M J A retry "budget" for allowing only a certain amount of retries over time.Á N ú üR& # # Why budgets and not max retries?Á y ú ü}F C The most common way of configuring retries is to specify a maximumÁ üÄ[ X number of retry attempts to perform before giving up. This is a familiar idea to anyoneÁ ü c ` who’s used a web browser: you try to load a webpage, and if it doesn’t load, you try again.Á ü„J G If it still doesn’t load, you try a third time. Finally you give up.Á Ï ú üÓU R Unfortunately, there are at least two problems with configuring retries this way:Á © ú üI F **Choosing the maximum number of retry attempts is a guessing game.**Á ü÷i f You need to pick a number that’s high enough to make a difference when things are somewhat failing,Á üág d but not so high that it generates extra load on the system when it’s really failing. In practice,Á üÉa ^ you usually pick a maximum retry attempts number out of a hat (e.g. 3) and hope for the best.Á « ú ü¯C @ **Systems configured this way are vulnerable to retry storms.**Á üóa ^ A retry storm begins when one service starts to experience a larger than normal failure rate.Á üÕf c This causes its clients to retry those failed requests. The extra load from the retries causes theÁ ü¼ c ` service to slow down further and fail more requests, triggering more retries. If each client isÁ ü
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d a configured to retry up to 3 times, this can quadruple the number of requests being sent! To makeÁ ü… k h matters even worse, if any of the clients’ clients are configured with retries, the number of retriesÁ üñ t q compounds multiplicatively and can turn a small number of errors into a self-inflicted denial of service attack.Á æ ú üê k h It's generally dangerous to implement retries without some limiting factor. [`Budget`]s are that limit.Á Ö
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# ExamplesÁ é
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```rustÁ üù
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! use std::{future, sync::Arc};Á › ú üŸ< 9 use tower::retry::{budget::{Budget, TpsBudget}, Policy};Á Ü ú ´à type Req = String;Á ´÷ type Res = String;Á Ž ú Ü’ #[derive(Clone, Debug)]Á Ä® struct RetryPolicy {Á üÇ budget: Arc<TpsBudget>,Á ,ç }Á í ú üñ1 . impl<E> Policy<Req, Res, E> for RetryPolicy {Á ü£( % type Future = future::Ready<()>;Á Ì ú üÐa ^ fn retry(&mut self, req: &mut Req, result: &mut Result<Res, E>) -> Option<Self::Future> {Á Ô² match result {Á ÔÍ Ok(_) => {Á üè8 5 // Treat all `Response`s as success,Á ü¡; 8 // so deposit budget and don't retry...Á üÝ* ' self.budget.deposit();Á Ĉ NoneÁ Œ¡ }Á ܳ Err(_) => {Á üÏ6 3 // Treat all errors as failures...Á ü†G D // Withdraw the budget, don't retry if we overdrew.Á üÎ: 7 let withdrew = self.budget.withdraw();Á ü‰" if !withdrew {Á ü¬$ ! return None;Á ¬Ñ }Á ç ú üë! // Try again!Á ü�+ ( Some(future::ready(()))Á Œ¹ €Î lË
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}Á LÙ }Á ã ú üç? < fn clone_request(&mut self, req: &Req) -> Option<Req> {Á ì§ Some(req.clone())Á LÅ šÒ ,Ï àÉ <Õ š� 4I °Òý!L‡ » Ñ”Þ ü 8 5 Transactions Per Minute (Tps) Budget implementationsÁ Tæ »¤ × I ¤, ° ² AtomicIsizeÁ\k Ýà ° µ®Dx ¼À ° ¶¤,‹ µ> ° ·ý¤D£ Ö ° ¸ InstantÁ<Á e ° ¹Œ$4Ö Ò ° º >¦¨Ä>ü>*’”�ƒprt�b¤´KlÏ<¤û üß? < A Transactions Per Minute config for managing retry tokens.Á Ÿú ü£Q N [`TpsBudget`] uses a token bucket to decide if the request should be retried.Á õú üù` ] [`TpsBudget`] works by checking how much retries have been made in a certain period of time.Á üÚ] Z Minimum allowed number of retries are effectively reset on an interval. Allowed number ofÁ ü¸A > retries depends on failed request count in recent time frame.Á úú üþP M For more info about [`Budget`], please see the [module-level documentation].Á Ïú üÓ' $ [module-level documentation]: superÁ L† ‰Õ A")ãT ¼½¾¿ÀÁÂì–T–° » » µ>µ> ¤ ·>š7£> ¸> poisonÁ£> ¹> dataÁ£> Ë»™z™g—ÈÔtê<ê° » » Ì©,©° » » �� ž²Ž ¡ˆˆ ¢‰ˆ l }.xÏ
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° » » tù ‰ÕÄÅÆÈÉ üçG üŽ I F Create a [`TpsBudget`] that allows for a certain percent of the totalÁ ÜÜ requests to be retried.Á ü ú ü„
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H E - The `ttl` is the duration of how long a single `deposit` should beÁ üÑ
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3 0 considered. Must be between 1 and 60 seconds.Á ü‰M J - The `min_per_sec` is the minimum rate of retries allowed to accommodateÁ üÛI F clients that have just started issuing requests, or clients that doÁ ü©) & not issue many requests per window.Á ü×J G - The `retry_percent` is the percentage of calls to `deposit` that canÁ ü¦D A be retried. This is in addition to any retries allowed for viaÁ üï0 - `min_per_sec`. Must be between 0 and 1000.Á ¤ú ü¬L I As an example, if `0.1` is used, then for every 10 calls to `deposit`,Á üýE B 1 retry will be allowed. If `2.0` is used, then every `deposit`Á ÜÇ allows for 2 retries.Á î ñ¥‰Õ à Ã
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Ä ttlÁ ò min_per_secÁ\�
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„� ü“P õÙ ä ú üè& # [module-level documentation]: selfÁ 4™ Ò Ò ÿµü�Å Ò ÿµ ÿµ ÓÔÓÔ Ó Ô ”ˆ ü¦H E Store a "deposit" in the budget, which will be used to permit futureÁ „ó
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withdrawals.Á<‹ ” ”‡¶ Ò “ Ò
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Ó‡¶$” Ü· ü H E Check whether there is enough "balance" in the budget to issue a newÁ Tí retry.Á ü ú ü„. + If there is not enough, false is returned.ÁDº • •‡¶ Ò Ã Ò
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ü¦&! &àÌÊÏ „Õ!œÖå _a df ik üí’! û! ۼݼ޼© ß¼ à¼ÛἈ cSñŸ«‡zÙÊϱÚàÌÊÏ & œÖ á á
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Â÷Ð÷üÆ I!$É ! – — ˜„¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• –œÖ —Ì�Ì� k Î�´»¸� Ï�Ç»¸� Ð�໸� Ñ�À ¸� Ò�ÿ»¸� f'EwÚ]¾å ˜œØžØ ŸØÈ Øˆ ¡Ø¢Ø´ ‰‰Nµý¤ÃœÖ ƒØ æ Ø ! æ
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üë# ü±5 2 Creates a new [`RetryLayer`] from a retry policy.Á ø âÖÞÙ ï ï
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ñâÖŒ&¢�ü¸9 ¡ ó ¤ ô ô ó ’÷ ½ ¾õ À ØâÖ ,ëÞÙõö 'Ü 'Ý ö 24 79 dø<ý ò ò ±Úü™,,œ ™ ™ÞÙ àÌÞÙàÌ 'Ü ò ¢ ò
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öâÖàÌ$£¥j<©Tl 4pŒù�4 ‚Ø ÷ øœìæ ü@ = A "retry policy" to classify if a request should be retried.Á [ú l_åä mú <qš� ìy use tower::retry::Policy;Á ¤— use std::future;Á ¬ú ´°¨È ´ÇÇÈ Þú Üâ struct Attempts(usize);Á þú ü‚. + impl<E> Policy<Req, Res, E> for Attempts {Á ü±(¶Ê Úú üÞaôÊ ÔÀÞË ÔÛ�Ì üö8¥Ì ü¯( % // so don't retry...Á ÄØßÍ ”ñ },Á Ü„šÎ ü 6¿Î ü×= : // But we limit the number of attempts...Á ü•# if self.0 > 0 {Á ü¹% " // Try again!Á üß$ ! self.0 -= 1;Á ü„/ , Some(future::ready(()))Á ä´ } else {Á üÑ= : // Used all our attempts, no retry...Á ä� NoneÁ ¬¬íÐ ŒÂ€Î lÔ„Ò LâšÒ ìú üð?¹Ò ì° �Ó LÎ šÒ ,Ø àÉ <Þ š� 4ð ù & ú ¸& û – ü ú ü û ù ÿµüæ Ò Íìñƒ ÷ Íì¸& ü Íìõã �
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6 3 The [`Future`] type returned by [`Policy::retry`].Á4Ê
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ù ù üÀX üì
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< 9 Check the policy if a certain request should be retried.Á ú üµ I F This method is passed a reference to the original request, and eitherÁ üƒ K H the [`Service::Response`] or [`Service::Error`] from the inner service.Á Ó ú üÛ < 9 If the request should **not** be retried, return `None`.Á œ
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ú ü¤
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L I If the request *should* be retried, return `Some` future that will delayÁ üõ
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J G the next retry of the request. This can be used to sleep for a certainÁ üÄL I duration, to wait for some external condition to be met before retrying,Á ü•H E or resolve right away, if the request should be retried immediately.Á âú Äê ## Mutating RequestsÁ ‡ú ü�L I The policy MAY chose to mutate the `req`: if the request is mutated, theÁ üàH E mutated request will be sent to the inner service in the next retry.Á üH E This can be helpful for use cases like tracking the retry count in aÁ \ú header.Á Šú ¼’ ## Mutating ResultsÁ ®ú ü¶E B The policy MAY chose to mutate the result. This enables the retryÁ ü€K H policy to convert a failure into a success and vice versa. For example,Á üÐG D if the policy is used to poll while waiting for a state change, theÁ üœJ G policy can switch the result to emit a specific error when retries areÁ të exhausted.Á þú ü†A > The policy can also record metadata on the request to includeÁ üÌH E information about the number of retries required or to record that aÁ ü™0 - failure failed after exhausting all retries.Á Îú üÖ3 0 [`Service::Response`]: crate::Service::ResponseÁ üŽ- * [`Service::Error`]: crate::Service::ErrorÁ,à š › œ š‡¶ ›ñƒ œÖ¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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þ‡¶ñƒ¾Œõã$Î’¬ Ô� 4ãü€6 üžF C Tries to clone a request before being passed to the inner service.Á éú üñI F If the request cannot be cloned, return [`None`]. Moreover, the retryÁ ü¿< 9 function will not be called if the [`None`] is returned.Álƒ � ž �‡¶ žñƒ û¿ ù ‘ ù
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ÿ‡¶ñƒ¾Œõã$–’¬ œ¼�C¤¢ûBä½ðBìßáBL‚ÔB×BÄBÇB´¢¸B´æ ¡ ‰ ¤ Š ‰ Š ’÷ ë ¾õ î ±Ú‹Œ�Ž !# üÁ
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9 6 Retry the inner service depending on this [`Policy`].Á Î
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‹âÖàÌŒ&W‘¥ja‘ÜÍ ü ( % Get a reference to the inner serviceÁ<Ô Ÿ Ÿ±Ú ŸàÌ ˆ Ü ˆ
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�âÖàÌ$ÕäÀ üŒ/ , Consume `self`, returning the inner serviceÁTÇ ±ÚàÌ ˆ ˆ
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—âÖàÌÊÏ$åÇt<ë|¤> ü 2 / Middleware that applies a timeout to requests.Á 3 ú ü7P M If the response does not complete within the specified timeout, the responseÁ ¤ˆ will be aborted.Á »©(œŽ> ܈> <¬> ™¢µ‰ò�dÞ ƒ ¿™ttÿ Û
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ù¯Ë©Ùš7;”±E”ü‰% ü¿? < Returns a new [`Layer`] that produces [`AndThen`] services.Á ƒ ú ü‹K H This is a convenience function that simply calls [`AndThenLayer::new`].Á Û ú üã! [`Layer`]: tower_layer::LayerÁ,� ©Ùùâ ö ö
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( üÔ*( ' A boxed `Service + Send` trait object.Á ÿ(ú üƒM( J [`BoxService`] turns a service into a trait object, allowing the responseÁ üÑJ( G future type to be dynamic. This type requires both the service and theÁ üœ#( response future to be [`Send`].Á À(ú üÄL( I If you need a boxed [`Service`] that implements [`Clone`] consider usingÁ ü‘6( 3 [`BoxCloneService`](crate::util::BoxCloneService).Á È(ú üÌO( L Dynamically dispatched [`Service`] objects allow for erasing the underlyingÁ üœR( O [`Service`] type and using the `Service` instances as opaque handles. This canÁ üïO( L be useful when the service instance cannot be explicitly named for whateverÁ \¿( reason.Á Ë(ú tÏ(èÆ Þ(ú <â(š� Üê( use std::future::ready;Á ü†!( # use tower_service::Service;Á ü¨0( - # use tower::util::{BoxService, service_fn};Á üÙK( H // Respond to requests using a closure, but closures cannot be named...Á ¬¥( # pub fn main() {Á ü»0( - let svc = service_fn(|mut request: String| {Á üì&( # request.push_str(" response");Á Ô“ ( ready(Ok(request))Á <® (Æè ¶ (ú üº G( D let service: BoxService<String, String, ()> = BoxService::new(svc);Á ¤‚
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<�D#Ãë ,™D#ø› Œ£D#æ |¹D# # async {Á üÍD+# ( // A service returning Result<_, Error>Á üýD9#ÒÐ
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»E#ú üÃE## // Map the error to a new errorÁ üëE:# 7 let mut new_service = service.map_err(|err| err.code);Á ªF#ú ܲF#”Ó
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ü¸SK# H into a different type. It can also be used to change the [`Error`] typeÁ üˆTO# L of the service. However, because the [`map_result`] function is not appliedÁ üÜTJ# G to the errors returned by the service's [`poll_ready`] method, it mustÁ ü«UK# H be possible to convert the service's [`Error`] type into the error typeÁ üûUN# K returned by the [`map_result`] function. This is trivial when the functionÁ üÎVJ# G returns the same error type as the service, but in other cases, it canÁ ü�WA# > be useful to use [`BoxError`] to erase differing error types.Á ãW#ú tëW#èÆ þW#ú ü†X## Recovering from certain errors:Á ®X#ú <¶X#š� üÂX%#¤Ç
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‡¶ÎŸ‚’° $½•#± Õ#wy pr ü¯ßü# ü²¿;# 8 Composes an asynchronous function *after* this service.Á ò¿#ú üú¿J# G This takes a function or closure returning a future, and returns a newÁ üÉÀL# I `Service` that chains that function after this service's [`Future`]. TheÁ üšÁJ# G new `Service`'s future will consist of this service's future, followedÁ üéÁL# I by the future returned by calling the chained function with the future'sÁ üºÂI# F [`Output`] type. The chained function is called regardless of whetherÁ üˆÃI# F this service's future completes with a successful response or with anÁ TÖÃ# error.Á åÃ#ú üíÃD# A This method can be thought of as an equivalent to the [`futures`Á ü¶ÄJ# G crate]'s [`FutureExt::then`] combinator, but acting on `Service`s thatÁ ü…ÅL# I _return_ futures, rather than on an individual future. Similarly to thatÁ üÖÅJ# G combinator, [`ServiceExt::then`] can be used to implement asynchronousÁ ü¥ÆE# B error recovery, by calling some asynchronous function with errorsÁ üïÆJ# G returned by this service. Alternatively, it may also be used to call aÁ ü¾ÇI# F fallible async function with the successful response of this service.Á ŒÈ#ú ü”ÈJ#�Ä
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„×#ú üŒ×F# C // If the database service returns an error, attempt to recover byÁ ü××O# L // calling `recover_from_error`. Otherwise, return the successful response.Á ü«Ø<# 9 let mut new_service = service.then(|result| async move {Á ´ìØ# match result {Á ü‡Ù%# " Ok(record) => Ok(record),Á ü±Ù2# / Err(e) => recover_from_error(e).await,Á LèÙ#šÒ <öÙ#Æè ‚Ú#ú ÜŠÚ#”Ó
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áì#ú üéìB# ? let mut new_service = service.map_future(|future| async move {Á ü°íA# > let res = timeout(Duration::from_secs(1), future).await?;Á ôöí# Ok::<_, BoxError>(res)Á <™î#Æè ¥î#ú Üî#”Ó
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<ˆð#Ãë <”ð#š� ð#ú ü¨ð]# Z Note that normally you wouldn't implement timeouts like this and instead use [`Timeout`].Á Šñ#ú ü’ñ"# [`call`]: crate::Service::callÁ ü¹ñ(# % [`Timeout`]: crate::timeout::TimeoutÁTéñ# ‡¶Ÿ‚ Ù Ù ÷§ Üš7 � ݱ � ã‡" î}pO‡¶Ÿ‚ Ñ
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‡¶ÎŸ‚üæÕÛ éÛ $�ò#± “ò#69 <? 7: 25 üòý˜# üÿóC# @ Convert the service into a [`Service`] + [`Send`] trait object.Á Çô#ú üÏô(# % See [`BoxService`] for more details.Á üô#ú ü„õH# E If `Self` implements the [`Clone`] trait, the [`boxed_clone`] methodÁ üÑõC# @ can be used instead, to produce a boxed service which will alsoÁ Ä™ö# implement [`Clone`].Á ¶ö#ú l¾ö#åä Ðö#ú <Øö#š� üäöM# J use tower::{Service, ServiceExt, BoxError, service_fn, util::BoxService};Á ,¶÷#ø› ¬À÷#†œ ´Ú÷#¤œ ¬õ÷#Ãœ ü�ø##✠<·ø#Ãë Ãø#ú üËø3# 0 let service = service_fn(|req: Request| async {Á üƒù*# ' Ok::<_, BoxError>(Response::new())Á <²ù#Æè ¾ù#ú üÆùB# ? let service: BoxService<Request, Response, BoxError> = serviceÁ ä�ú#ÍŸ ü®ú)#óŸ |Üú#¥ Tðú#½ ìÿú#Ð ü¡û*#÷ |Ðû#ª¡ Täû#½ Œóû# .boxed();Á ü‰ü,#²¥ üºü*#ç¦ üéü!#›§ <�ý#š� ›ý#ú ü£ý #ˆ“ üÇý&# # [`boxed_clone`]: Self::boxed_cloneÁ,õý# ‡¶ š š ð6 žš7 Œ �Dä’Êò¹YÎÞá
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‡¶Î$ûý#üú‰«# üºÿO# L Convert the service into a [`Service`] + [`Clone`] + [`Send`] trait object.Á Ž€#ú ü–€R# O This is similar to the [`boxed`] method, but it requires that `Self` implementÁ üí€C# @ [`Clone`], and the returned boxed service implements [`Clone`].Á üµ�-# * See [`BoxCloneService`] for more details.Á ç�#ú lï�#åä �‚#ú <‰‚#š� ü•‚R# O use tower::{Service, ServiceExt, BoxError, service_fn, util::BoxCloneService};Á ,ì‚#ø› ¬ö‚#†œ ´�ƒ#¤œ ¬«ƒ#Ãœ üŃ##✠<íƒ#Ãë ùƒ#ú ü�„3#‘â ü¹„*#Ïâ <è„#Æè ô„#ú üü„G# D let service: BoxCloneService<Request, Response, BoxError> = serviceÁ äÈ…#ÍŸ üé…)#óŸ |—†#¥ T«†#½ 캆#Ð ü܆*#÷ |‹‡#ª¡ TŸ‡#½ ¼®‡# .boxed_clone();Á ʇ#ú üÒ‡-# * // The boxed service can still be cloned.Á ¤„ˆ# service.clone();Á ü�ˆ,#²¥ üΈ*#ç¦ üýˆ!#›§ <£‰#š� ¯‰#ú ü·‰ #ˆ“ ÔÛ‰# [`boxed`]: Self::boxedÁ\ý‰# ‡¶ ý ý þä< ‚ˆ ñ Dm’Çnü©vÎÞá
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ÎìíÌ Ý‹# ‡€<è‹# ÇÑ ü”Œ #íÌ " ü¿‘?# ü¸Œ0# - Convert an `Option<Layer>` into a [`Layer`].Á éŒ#ú <íŒ#š� ôõŒ# # use std::time::Duration;Á Ì”�# # use tower::Service;Á ü®�)# & # use tower::builder::ServiceBuilder;Á üØ�"# use tower::util::option_layer;Á üû�'# $ # use tower::timeout::TimeoutLayer;Á ü£Žm# j # async fn wrap<S>(svc: S) where S: Service<(), Error = &'static str> + 'static + Send, S::Future: Send {Á ü‘�/# , # let timeout = Some(Duration::new(10, 0));Á üÁ�-# * // Layer to apply a timeout if configuredÁ üï�E# B let maybe_timeout = option_layer(timeout.map(TimeoutLayer::new));Á µ�#ú ̹�# ServiceBuilder::new()Á ìÓ�# .layer(maybe_timeout)Á ´ñ�# .service(svc);Á <ˆ‘#Ãë <�‘#š� ˜‘#ú üœ‘"# [`Layer`]: crate::layer::LayerÁdÆ‘# ۼݼ޼© ß¼ à¼ÛἈ cSñŸ«‡zÙÅ‘ ÷ ú ûÖ‘ üˆ ý þï‘ ÿˆ Iyüj ž§ºÅ‘�’ � ÷
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‚ Ì� � „ „ ¾û ” –‘… ‡ ‰ ‹ � Ž ’ ” – ˜ š œ ž Ÿ ¡ £ ¤ ¦ « ® ± GI ü³ > ü¯ 4 1 Add a new layer `T` into the [`ServiceBuilder`].Á è ú üð L I This wraps the inner service with the service provided by a user-definedÁ üÁ E B [`Layer`]. The provided layer must implement the [`Layer`] trait.Á ‹ ú Ü“ °“,º –‘¥Ì Ö Ö ê· Ø»% ø
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… Å‘¥Ì$à »%,É " üÉ&ƒ üÔ!? < Optionally add a new layer `T` into the [`ServiceBuilder`].Á ˜"ú < "š� ô¬"”ó ÌÏ"¼ó üí")àó ü›#'Áô üÇ#móô ü¹$/ëõ üí$$ ! // Apply a timeout if configuredÁ Ì–%¹÷ ü´%5 2 .option_layer(timeout.map(TimeoutLayer::new))Á ¬î% .service(svc)Á <ˆ& # ;Á <”&Ãë < &š� »·+„²&Ĭ&dÐ& –‘ۼݼ޼© ß¼ à¼ÛἈ cSñŸ«‡zÙ¥Ì Ö Ö ê· Ø»% ø
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‡ Å‘¥Ì$é&»%,÷& " üï)T ü�(] Z Add a [`Layer`] built from a function that accepts a service and returns another service.Á ñ(ú üù(< 9 See the documentation for [`layer_fn`] for more details.Á º)ú üÂ)( % [`layer_fn`]: crate::layer::layer_fnÁDö) –‘©Ù Ö Ö ê· Ø»% ø
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Èõ¹p „8ç'ò'ò ßû 'õš7' 'öû� ' PÛÈù—'ê'ê �Ú 'ì±' äƒ5ظ�³©ÙÅ‘ ƒ — Š Š ƒ ëÕ ÿ)
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‰ Å‘©Ù$‚*± ˆ* " ü÷@Y üÐ=H E Retry failed requests according to the given [retry policy][policy].Á �>ú ü¥>F C `policy` determines which failed requests will be retried. It mustÁ üð>2 / implement the [`retry::Policy`][policy] trait.Á §?ú ü¯?B ? This wraps the inner service with an instance of the [`Retry`]Á |ö?¤ò Š@ú Ü’@ [`Retry`]: crate::retryÁ ü²@" [policy]: crate::retry::PolicyÁ »þ Œß@ÌÙ@,þ@ –‘¾× Ö Ö ê· Ø»% ø
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‹ Å‘¾×$‡AŒ&4�A " ü�Eƒ ü˜B2 / Fail requests that take longer than `timeout`.Á ÏBú ü×BH E If the next layer takes more than `timeout` to respond to a request,Á ü¤C6 3 processing is terminated and an error is returned.Á ßCú üçCD A This wraps the inner service with an instance of the [`timeout`]Á |°D¤ò ÄDú üÌD [`timeout`]: crate::timeoutÁ »©(œöDÜðD<—E –‘ñ¥ Ö Ö ê· Ø»% ø
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� Å‘$¨E©(<¶Eüç^« üæO$ ! Map one request type to another.Á �Pú ü—PG D This wraps the inner service with an instance of the [`MapRequest`]Á |ãP¤ò ÷Pú tÿPèÆ ’Qú üšQ# Changing the type of a request:Á ÂQú \ÊQ‹Ç ôÚQ use tower::ServiceBuilder;Á ÔýQ use tower::ServiceExt;Á œRú ¤¤Rõû ü½R) & # async fn main() -> Result<(), ()> {Á üëRE B // Suppose we have some `Service` whose request type is `String`:Á üµSE B let string_svc = tower::service_fn(|request: String| async move {Á üÿS) & println!("request: {}", request);Á tT Ok(())Á <ÀTÆè ÌTú üÔTI F // ...but we want to call that service with a `usize`. What do we do?Á ¢Uú üªU) & let usize_svc = ServiceBuilder::new()Á üØUJ G // Add a middleware that converts the request type to a `String`:Á ü§V= : .map_request(|request: usize| format!("{}", request))Á üéV? < // ...and wrap the string service with that middleware:Á ìW .service(string_svc);Á ÏWú ü×W4 1 // Now, we can call that service with a `usize`:Á ü�X! usize_svc.oneshot(42).await?;Á d¶X»€
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<ÇXÃë <ÓXš� ßXú üçX Modifying the request value:Á ŒYú \”Y‹Ç ô¤Y½™ ÔÇYä™ æYú ¤îYõû ü‡Z)¡š üµZ4 1 // A service that takes a number and returns it:Á üîZ= : let svc = tower::service_fn(|request: usize| async move {Á ”°[ Ok(request)Á <Ç[Æè Ó[ú üÛ[# let svc = ServiceBuilder::new()Á üƒ\8 5 // Add a middleware that adds 1 to each requestÁ üÀ\2 / .map_request(|request: usize| request + 1)Á ´÷\ƒø ’]ú üš]) & let response = svc.oneshot(1).await?;Á äÈ] assert_eq!(response, 2);Á dé]»€
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<ú]Ãë <†^š� ’^ú üš^+ ( [`MapRequest`]: crate::util::MapRequestÁ »·+„Ð^ÄÊ^\î^ –‘©Ù Ö Ö ê· Ø»% ø
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Èõ¹p „8ç'ò'ò ßû 'õš7' 'öû� ' PÛÈù—ÏúÅ‘ ƒ — � ôN � þN ‘ ‘ � � ƒ ëÕ ú^ …îý^ –î�_ ºî|ú_ âí‡` úç,Œ`
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Ž Å‘©Ùýùóí$Ž_± œ_PR UW Z\ üécw üÝ`% " Map one response type to another.Á ‡aú ü�aH E This wraps the inner service with an instance of the [`MapResponse`]Á |Üa¤ò ðaú üøaJ G See the documentation for the [`map_response` combinator] for details.Á Çbú üÏb- * [`MapResponse`]: crate::util::MapResponseÁ ü�cF C [`map_response` combinator]: crate::util::ServiceExt::map_responseÁ »·+„ÒcÄÌcdðc –‘©Ù Ö Ö ê· Ø»% ø
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’ Å‘©Ù$‰d± —d " ü“hV ü¨e" Map one error type to another.Á Ïeú ü×eC @ This wraps the inner service with an instance of the [`MapErr`]Á |Ÿf¤ò ³fú ü»fE B See the documentation for the [`map_err` combinator] for details.Á …gú ü�g# [`MapErr`]: crate::util::MapErrÁ üµg< 9 [`map_err` combinator]: crate::util::ServiceExt::map_errÁ »·+„ügÄög<šh –‘©Ù Ö Ö ê· Ø»% ø
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Èõ¹p „8ç'ò'ò ßû 'õš7' 'öû� ' PÛÈù—çøÅ‘ ƒ — • • ƒ ëÕ ¢h
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” Å‘©Ù$¥h± «h " üËl\ ü¬iHþÌ ùiú ü�jW T This wraps the inner service with an instance of the [`MapFutureLayer`] middleware.Á Ýjú üåjH E See the documentation for the [`map_future`] combinator for details.Á ²kú üºk3 0 [`MapFutureLayer`]: crate::util::MapFutureLayerÁ üòk7 4 [`map_future`]: crate::util::ServiceExt::map_futureÁ »·+„´lÄ®lTÒl –‘©Ù Ö Ö ê· Ø»% ø
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– Å‘©Ù$àl± æl " üÊtQ üímV S Apply an asynchronous function after the service, regardless of whether the futureÁ ´Èn succeeds or fails.Á ãnú üënA > This wraps the inner service with an instance of the [`Then`]Á |±o¤ò Åoú üÍoF C This is similar to the [`map_response`] and [`map_err`] functions,Á ü˜pHÔñ
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“rú ü›rB ? See the documentation for the [`then` combinator] for details.Á ârú üêr [`Then`]: crate::util::ThenÁ üŽs6 3 [`then` combinator]: crate::util::ServiceExt::thenÁ üÉs2 / [`map_response`]: ServiceBuilder::map_responseÁ ü€t( % [`map_err`]: ServiceBuilder::map_errÁ »·+„³tÄt$Ñt –‘©Ù Ö Ö ê· Ø»% ø
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Êxú üÒxD A This wraps the inner service with an instance of the [`AndThen`]Á |›y¤ò ¯yú ü·yF C See the documentation for the [`and_then` combinator] for details.Á ‚zú üŠz*’Æ
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üìz> ; [`and_then` combinator]: crate::util::ServiceExt::and_thenÁ ü¯{% " [`AndThen`]: crate::util::AndThenÁ »·+„ß{ÄÙ{Dý{ –‘©Ù Ö Ö ê· Ø»% ø
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Èõ¹p „8ç'ò'ò ßû 'õš7' 'öû� ' PÛÈù—ùâÅ‘ ƒ — › › ƒ ëÕ †|
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¼~ú üÄ~F C This wraps the inner service with an instance of the [`MapResult`]Á |�¤ò £ú ü«H E See the documentation for the [`map_result` combinator] for details.Á øú ü€€B ? [`map_result` combinator]: crate::util::ServiceExt::map_resultÁ üÇ€) & [`MapResult`]: crate::util::MapResultÁ »·+„û€Äõ€T™� –‘©Ù Ö Ö ê· Ø»% ø
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œ Å‘©Ù$§�± �#% äë‚ ü´‚2 / Returns the underlying `Layer` implementation.ÁTò‚ –‘Å‘ ƒ ƒ
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ž Å‘$ý‚üý„Q ü¨ƒ= : Wrap the service `S` with the middleware provided by thisÁ üêƒB ? [`ServiceBuilder`]'s [`Layer`]'s, returning a new [`Service`].Á ±„ú ܹ„°“ üÙ„ ˆ“<„… … …–‘ àÌÅ‘àÌ 'Ü ƒ ¤ �… ƒ ¾õ Œ… 'ÚÅ‘àÌ DÅ…
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Ÿ Å‘àÌ$�…¥j<–…8: üÚ�e ü‚†Y V Wrap the async function `F` with the middleware provided by this [`ServiceBuilder`]'sÁ üà†, ) [`Layer`]s, returning a new [`Service`].Á ‘‡ú ü™‡? < This is a convenience method which is equivalent to callingÁ ü݇A > [`ServiceBuilder::service`] with a [`service_fn`], like this:Á £ˆú \«ˆ‹Ç ü»ˆ. + # use tower::{ServiceBuilder, service_fn};Á üîˆ= : # async fn handler_fn(_: ()) -> Result<(), ()> { Ok(()) }Á |°‰ # let _ = {Á Ìĉ¹÷ tâ‰ñÁ üõ‰( % .service(service_fn(handler_fn))Á D¢Š²ë <¯Šš� »Šú lÊåä ÕŠú \ÝŠ‹Ç ä튤ù üŽ‹B ? use tower::{ServiceBuilder, ServiceExt, BoxError, service_fn};Á Õ‹ú ¤Ý‹õû üö‹/“ü üªŒN K async fn handle(request: &'static str) -> Result<&'static str, BoxError> {Á ”ýŒ¡£ ,”�àÉ ž�ú ü¦�#Ö£ ¬Î� .buffer(1024)Á üè�)”¢ ä–Ž .service_fn(handle);Á ·Žú ü¿Ž- * let response = svc.oneshot("foo").await?;Á ñŽú üùŽ assert_eq!(response, "foo");Á dž�»€
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¡ Å‘©Ù$ï�± õ�9; üؘ? ü‚’. + Check that the builder implements `Clone`.Á µ’ú ü½’[ X This can be useful when debugging type errors in `ServiceBuilder`s with lots of layers.Á �“ú ü¥“C @ Doesn't actually change the builder but serves as a type check.Á í“ú lõ“åä ‡”ú \�”‹Ç ôŸ”½™ ”ú üÊ”' $ let builder = ServiceBuilder::new()Á üö”5 2 // Do something before processing the requestÁ ü°•( % .map_request(|request: String| {Á üÝ•% " println!("got request!");Á œ‡– requestÁ TŸ–½ ü®–4 1 // Ensure our `ServiceBuilder` can be clonedÁ ´ç– .check_clone()Á ü‚—4 1 // Do something after processing the requestÁ ü»—* ' .map_response(|response: String| {Á üê—& # println!("got response!");Á ¤•˜ responseÁ \®˜‘¥ <¾˜š�\ߘ –‘–‘ ƒ ƒ Ø–‘ ,‘™
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£ Å‘$ë˜ü¾¡e ü¶™^ [ Check that the builder when given a service of type `S` produces a service that implementsÁ d™š `Clone`.Á ªšú ü²š[‹Ú ’›ú üš›CþÚ â›ú lê›åä ü›ú \„œ‹Ç ô”œ½™ ·œú ´¿œ # #[derive(Clone)]Á ¼Úœ # struct MyService;Á ,öœø› ü€�'�Ü ü¬�5ÏÜ üæ�(�Ý ü“ž%ÂÝ œ½žñÝ TÕž½ üäžO L // Ensure that the service produced when given a `MyService` implementsÁ ü¸Ÿ+ ( .check_service_clone::<MyService>()Á üèŸ4üÞ ü¡ *»ß üÐ &ðß ¤û à \”¡‘¥ <¤¡š�œÅ¡ –‘–‘ ƒ ¤ ¥ ¥ ƒ ¾õ Ù¡ �Î Dÿ¡ ØÓÍ ,�¢
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¤ Å‘àÌ$Ü¡46 ü•°† ü¢] Z Check that the builder when given a service of type `S` produces a service with the givenÁ ü¤£' $ request, response, and error types.Á Уú üØ£[‹Ú ¸¤ú üÀ¤CþÚ ˆ¥ú l�¥åä ¢¥ú \ª¥‹Ç ôº¥½™ üÝ¥# use std::task::{Poll, Context};Á ü…¦% " use tower::{Service, ServiceExt};Á ¯¦ú Ì·¦ // An example serviceÁ ¬Õ¦ struct MyService;Á ï¦ú ü÷¦) & impl Service<Request> for MyService {Á ü¥§ type Response = Response;Á Ìɧ type Error = Error;Á üç§@ = type Future = std::future::Ready<Result<Response, Error>>;Á ¬¨ú ü´¨W T fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {Á „�©
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// ...Á œ¥© # todo!()Á <½© }Á É©ú üÑ©< 9 fn call(&mut self, request: Request) -> Self::Future {Á „’ªåí œ§ªÿí <¿ªœî ,˪àÉ Õªú œÝª struct Request;Á ¤õª struct Response;Á ŒŽ« struct Error;Á ¤«ú ü¬«% " struct WrappedResponse(Response);Á Ö«ú üÞ«'�Ü üŠ¬Y V // At this point in the builder if given a `MyService` it produces a service thatÁ üè¬L I // accepts `Request`s, produces `Response`s, and fails with `Error`sÁ ü¹? < .check_service::<MyService, Request, Response, Error>()Á üý. + // Wrap responses in `WrappedResponse`Á ü°®E B .map_response(|response: Response| WrappedResponse(response))Á üú®: 7 // Now the response type will be `WrappedResponse`Á ü¹¯= : .check_service::<MyService, _, WrappedResponse, _>();Á <û¯š�lœ° –‘–‘ ƒ ¤ § ¥ ¨ ¦ © – ª ª ¨ § © ƒ ¾õ ª° Íì¥ ° Íì¦ °° –© ³° �Î DÙ° &ÓÍ ˜÷ ü÷°#
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¦ Å‘à̘÷ ¬÷ ê¨ $¶°£¥ œž •— ™› ü¶¹£ üº±X U This wraps the inner service with the [`Layer`] returned by [`BoxService::layer()`].Á —²ú üŸ²% " See that method for more details.Á ɲú lѲåä ã²ú <벚� ü÷²E B use tower::{Service, ServiceBuilder, BoxError, util::BoxService};Á äÁ³¤ù ,â³ø› ¬ì³†œ ´†´¤œ ¬¡´Ãœ ü»´#✠<ã´Ãë ï´ú ü÷´P M let service: BoxService<Request, Response, BoxError> = ServiceBuilder::new()Á „̵
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« Å‘àÌ‘ö$Ò¹ŠŒ Ž� ü–ɶ ü ¾] Z This wraps the inner service with the [`Layer`] returned by [`BoxCloneService::layer()`].Á ‚¿ú üŠ¿R³è üá¿C�é ©Àú ü±À-Þé ãÀú lëÀåä ýÀú <…Áš� ü‘ÁJœ� äàÁ¤ù ,�Âø› ¬‹Â†œ ´¥Â¤œ ¬ÀÂÃœ üÚÂ#✠<‚ÃÃë ŽÃú ü–ÃU R let service: BoxCloneService<Request, Response, BoxError> = ServiceBuilder::new()Á ´ðà .boxed_clone()Á ¤‹ÄÏ¡ ô¤Äì¡ üÇÄ)”¢ üõÄ*Ç¢ ü¤Å.Ú¤ \×Å‘¥ üçÅ,²¥ ˜Æú ü Æ-¶î ¤ÒÆíî üëÆ*ç¦ üšÇ!›§ <ÀÇš� ÌÇú üÔÇG D [`BoxCloneService::layer()`]: crate::util::BoxCloneService::layer()Á ü È5 2 [`BoxCloneService`]: crate::util::BoxCloneServiceÁ ÔÚÈâï »·+„ÿÈÄùÈ\�É –‘ Ö Ö ê· Ø»% ø
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® Å‘àÌ‘ö$¸Éfh jl ü·Ù† ü˜Î] Z This wraps the inner service with the [`Layer`] returned by [`BoxCloneSyncServiceLayer`].Á úÎú ü‚ÏX U This is similar to the [`boxed_clone`] method, but it requires that `Self` implementÁ üßÏA > [`Sync`], and the returned boxed service implements [`Sync`].Á ¥Ðú üÐ1 . See [`BoxCloneSyncService`] for more details.Á ãÐú lëÐåä ýÐú <…Ñš� ü‘ÑN K use tower::{Service, ServiceBuilder, BoxError, util::BoxCloneSyncService};Á ääѤù ,…Òø› ¬�Ò†œ ´©Ò¤œ ¬ÄÒÃœ üÞÒ#✠<†ÓÃë ’Óú üšÓY V let service: BoxCloneSyncService<Request, Response, BoxError> = ServiceBuilder::new()Á ¤øÓÏ¡ ô‘Ôì¡ ü´Ô)”¢ ÜâÔ .boxed_clone_sync()Á ü‚Õ*Ç¢ ü±Õ.Ú¤ \äÕ‘¥ üôÕ,²¥ ¥Öú üÖ-¶î ¤ßÖíî üøÖ*ç¦ ü§×!›§ <Íך� Ù×ú üá×G D [`BoxCloneSyncServiceLayer`]: crate::util::BoxCloneSyncServiceLayerÁ üØ= : [`BoxCloneSyncService`]: crate::util::BoxCloneSyncServiceÁ üïØ&Ðå »·+„ ÙÄšÙ„¾Ù –‘ Ö Ö ê· Ø»% ø
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» ¯Ë÷’$€áš7,†álî> ü 2/ / A collection of [`Layer`] based tower servicesÁ 3/ú Ü7/°“ ,ö> Á íhDj/ ' ¾ ú×,t/ 'Ú ¿ �Ú<{/ 'ê À \\/46')d¡/ ü†"/ Utilities for combining layersÁ ©/ú ü./ + [`Identity`]: crate::layer::util::IdentityÁ ÜÜ/°“ üø(/ % [`Stack`]: crate::layer::util::StackÁ $©/ ‹‘DÊ/ 'ä à ßû ,Ô/ 'ò Ä \¼/&(TÞ? ¬«¬«Â«Â«ôœ@ Õ«Ä�A ç«”ÏA ¬´ûA ¬T÷B »¼œ¸B »õ¤ÍB »�„ãB ü·B= ü®BH 4ûB Í œˆC 4’C Í ¥ Î Í Î ÿµ´ˆC ÌË ™C Í ÿµ ÿµ& !# ŒÊC ü¢C' $ Alias for a type-erased error type.ÁDÓC ¤¹¤� ü[I F A [`MakeService`] that produces services by cloning an inner service.Á ¥ú ü©' $ [`MakeService`]: super::MakeServiceÁ Ñú lÕåä ãú <çš� üï% " # use std::task::{Context, Poll};Á Ä• # use std::pin::Pin;Á ü®# # use std::convert::Infallible;Á üÒ$ ! use std::future::{Ready, ready};Á ü÷+ ( use tower::make::{MakeService, Shared};Á ô£ use tower::buffer::Buffer;Á ¼Â³å Úú üÞ! // An example connection typeÁ Ä€ struct Connection {}Á ™ú ô� // An example request typeÁ ¬¼ struct Request {}Á Òú üÖ // An example response typeÁ ´ö struct Response {}Á �ú ü‘2 / // Some service that doesn't implement `Clone`Á ¬Äþê Úú üÞ)«ë üˆ! type Response = Response;Á üª type Error = Infallible;Á üË: 7 type Future = Ready<Result<Response, Infallible>>;Á †ú üŠZ W fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {Á üå Poll::Ready(Ok(()))Á L…šÒ �ú ü“: 7 fn call(&mut self, req: Request) -> Self::Future {Á üÎ" ready(Ok(Response {}))Á LñšÒ ,ûàÉ � ú ü… R O // Example function that runs a service by accepting new connections and usingÁ üØ K H // `Make` to create new services that might be bound to the connection.Á 4¤
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Ô¯+Ñ # use std::cell::Cell;Á äÎ+õ # use std::error::Error;Á ´ï+ # use std::rc::Rc;Á ,Š+<ø› ü”$+L ! use std::future::{ready, Ready};Á ܽ+{ use futures::StreamExt;Á üÝ +¢ use futures::channel::mpsc;Á ü� +Í use tower_service::Service;Á ü¥ +ø use tower::util::ServiceExt;Á Ê+#ú üÒ@+2 = // First, we need to have a Service to process our requests.Á ü—#+~ #[derive(Debug, Eq, PartialEq)]Á ¼¿+¬ struct FirstLetter;Á üÛ0+Ï - impl Service<&'static str> for FirstLetter {Á ü� &+ # type Response = &'static str;Á ü» 3+= 0 type Error = Box<dyn Error + Send + Sync>;Á üó B+| ? type Future = Ready<Result<Self::Response, Self::Error>>;Á º
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Z+Ø W fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {Á ü¡ +> Poll::Ready(Ok(()))Á TÆ +i }Á Õ +~ú üÝ @+� = fn call(&mut self, req: &'static str) -> Self::Future {Á ü¢ !+Ù ready(Ok(&req[..1]))Á TÈ +°² ,× +àÉ á +#ú ”é +1 #[tokio::main]Á ¬€
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.+o + // Next, we need a Stream of requests.Á üÌ/+© , let (mut reqs, rx) = mpsc::unbounded();Á ü€X+ä U // Note that we have to help Rust out here by telling it what error type to use.Á üÝQ+H N // Specifically, it has to be From<Service::Error> + From<Stream::Error>.Á ü³0+¥ - let mut rsps = FirstLetter.call_all(rx);Á è+àú üða+ï ^ // Now, let's send a few requests and then check that we get the corresponding responses.Á üÖ,+\ ) reqs.unbounded_send("one").unwrap();Á ü‡,+” ) reqs.unbounded_send("two").unwrap();Á ü¸.+Ì + reqs.unbounded_send("three").unwrap();Á œë+ drop(reqs);Á ƒ+#ú ü‹R+2 O // We then loop over the response `Stream` that we get back from call_all.Á Üâ+� let mut i = 0usize;Á ü‚1+¶ . while let Some(rsp) = rsps.next().await {Á ü¸V+ó S // Each response is a Result (we could also have used TryStream::try_next)Á ü“)+U & match (i + 1, rsp.unwrap()) {Á ÔÁ+‰ (1, "o") |Á Ôà+® (2, "t") |Á ôÿ+Ó (3, "t") => {}Á Ü¢+ü (n, i) => {Á üÂ@+#
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©ïûé ³yï�ê þ ± ± ÿµÁïûé ± ÿµ ÿµ" ùïÏê6 ³ ¥ ³ ³ ö ïÔê ‡Ó
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¹ï×ê íÌ ùï‘ëF ³ — µ Ÿ ¶ µ ¶ ˆ¹ Á¸‚ø " Üè üc6 3 Service returned by the [`MapRequest`] combinator.Á šú üž8 5 [`MapRequest`]: crate::util::ServiceExt::map_requestÁ 7Tó ¤ ¸ — ¹ ¹ ¸ ÀÀ þ ëÕ �¥ù ¤²~lÂüÕù º»(* -/ DŠ,Š£ · · ¯Ë$˜ ˜£ · · ©Ù(òà » ¤ ½ — ¾ ½ ¾ ÀÀ± ëÕ¯ ÝËòþ úçò�¥ù¿ Ù ¿ ÜÞ áã |~ ç ç¥ù ¥ù ¼ òà ¼
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¿¯Ë©ÙÔìÚ üå 6 3 A [`Layer`] that produces [`MapRequest`] services.Á œ ú ü !¬ä 9|å — Á Á ˆ¹ õ Šú ßp}_ÑC  $þ þ £ À À ÁØ(ôË ¼ — Ä Ä ˆ¹o ¯…ôõ ŠúÅ Ù Å ŠŒ PR
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ëë„ Æ õÒ Æ
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ÈÁØý±äž ü”8 5 Service returned by the [`map_response`] combinator.Á Íú üÑ; 8 [`map_response`]: crate::util::ServiceExt::map_responseÁ :\© ¤ Ê — Ë Ê Ë ÀÀ µ ëÕ ¸�û ÍÀ(LŸP‚Ø ÌÍ(* -/ DÁ,ÁÅ É É ¯Ë$Ï ÏÅ É É ©Ù(ö– ¾ ¤ Ï — Ð Ð Ï ÀÀ± ëÕ¯ ÝËöµ úçö¸�ûÑ Ù Ñ ÜÞ áã |~ ì ì�û �û Î ö– Î
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ѯ˩ÙÔôŒ ü•8 5 A [`Layer`] that produces a [`MapResponse`] service.Á Îú üÒ!¬ä <„— — Ó Ó ˆ¹ ¨âû Ý£ø’øÐ) Ô $± ±Å Ò Ò ÁØ(øý ¿ — Ö Ö ˆ¹o åŒø¨âû× Àc × ŠŒ PR í î ï íâû î c c ˆ ¢cµ
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ïë„ Õ øý Õ
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×ÁØú± (ù„ À — Ù Ù ˆ¹r ¯…ù¨âûÚ Ù Ú Ž‘ SU ð ðâû âû Ø ù„ Ø
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ÚÁئøúž$ = — Ü Ÿ Ý Ü Ý ˆ¹ Û Á¸ ÞñüÞ øúÑ) úß )€@)€@ ïö )ƒ@š7)Ô S/ˆ¨>(8$Áصøñü Û Û
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ÞÁصøš7(úã øúá8 = — à Ÿ á à á ˆ¹ç Á¸åñüâ Àc â þ øú¨B ú« ñ ò ó ññü ò c c ˆ ¢cµ
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óë„ ß ú¯ ß
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âÁصø ú° ±ú¶ øúät = — ä Ÿ å ä å ˆ¹ Á¸ ‚Ø•è ˜úÄ ñüæç ƒØ „Ø ç KN RU Xúï 0úô ã ã •è ƒØøúÉi úÌ ô õ ö„¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• ôñü õÌ�Ì� k Î�´»¸� Ï�Ç»¸� Ð�໸� Ñ�À ¸� Ò�ÿ»¸� f'EwÚ]¾å öœØžØ ŸØÈ Øˆ ¡Ø¢Ø´ ‰‰Nµý¤Ãñü ƒØ ã úå ã
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çÁصø úÑ ´¬úñ ù‚•º´ üÏ2I‚�º / Response future from [`MapResponse`] services.Á †Bú üŽ-PÅ« ÊŒÉ — é Ÿ ê é ê ˆ¹¦ Á¸¥ñü ¥˜×½Ž‚U ëÊÍ ÑÔ á‚“» (úî Å è è •èYƒös ƒüs Å ùƒ¸{2 Î — î Ÿ ï î ï ˆ¹Z Á¸Yñüýÿ nq ux ùƒÚ•S ÁƒÝ• Å ÷ ÷ñü — ñ Ÿ ò ò ñ ƒ’– ˆ¹ Á¸ÿ
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!ƒŒ– $' +. ù…¨ÝÕ 1…¨Õ ÖQƒÝt ¾o ô — õ Ÿ ö ö ô õ ëÕ± ÑØ° ¨ü ¾o1…¤Þ ‚�ù„ÿÈ �Æ
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ó ó ¬o ÷š7 Å ‘’¼¢G.Z ¾o©Ù‚â ‘’¼¢G.Z ÷1…ÓÝ =@ DG ‰mÅ ó ó „¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• ¾o)€@)€@ ïö )ƒ@š7)Ô S/ˆ¨>(8$©Ù‚âùˆ¨ÝÕ 1ˆ¨Õ Øiƒ®x ¾o ù — ú Ÿ û ù ú û ëÕO ÑØN þô1ˆ¤Þ ‚�ù‡ÿÈ �Æ
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ø ø Üo üš7 Å ¿"XFçÁ ¾o©Ù‚â ¿"XFçÁ ü1ˆÓÝ Ô× ÛÞ ‰Å ø ø „¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• ¾oëö ùŠ•‡› 1Šù… 9ƒÜ} þ„¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• þñü ó ó ¬o ÷š7 Å ‘’¼¢G.Z þÁصø í 1Š°‡ í
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ýÁصø!ŠÅ‡ %'ùŒ•‡› 1Œù… Yƒ›� €„¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• €ñü ø ø Üo üš7 Å ¿"XFçÁ €Áصø í 1Œ°‡ í
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ÿÁصø!ŒÅ‡ %'ùŽå½0 ÔAŽñ½ ¾o ‚ — ƒ Ÿ „ ‚ ƒ „ ëÕ” ÑØ“ � � »p …Ûp Å †š7 Å �Ñ©é ¾o©Ù‚â �Ñ©é …†1Žú½ ùŽÜ¾< �ŽÜ¾ Å � � ‰Ð
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©�ûé Õy��ê Å ‹ ‹ ÿµÁ�ûé ‹ ÿµ ÿµ" ù�Ïê6 Õ ¥ � � ö �Ôê ‡Ó
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¹�×ê íÌ ù�‘ëF Õ — � Ÿ � � � ˆ¹ Á¸ñü Ô“ ü�6 3 Service returned by the [`map_result`] combinator.Á Æú üÊ7 4 [`map_result`]: crate::util::ServiceExt::map_resultÁ >Lž ¤ ’ — “ ’ “ ÀÀ ¨ ëÕ «’þ x
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,Oî*îD ”•(* -/ D´,´ê ‘ ‘ ¯Ë$ Âê ‘ ‘ ©Ù(“‹ Ý ¤ — — ˜ — ˜ ÀÀ± ëÕ¯ ÝË“¨ úç“«’þ™ Ù ™ ÜÞ áã |~ ø ø’þ ’þ – “‹ –
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™¯Ë©ÙÔäù ü„6 3 A [`Layer`] that produces a [`MapResult`] service.Á »ú ü¿!¬ä @t„ — › › ˆ¹ “çþ mÎE’‰¾÷£ œ $œ œê š š ÁØ(•ê Þ — ž ž ˆ¹o 匕“çþŸ Àc Ÿ ŠŒ PR
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¢Áئø—ž$ A — ¤ Ÿ ¥ ¥ ¤ ˆ¹ ¾ Á¸ Áöÿ¦ ø—Ñ) —ß )Æ6)Æ6 ȉ )É6š7)% ÚŸ Ãs½>Áصøöÿ £ £
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¦Áصøš7(—ã ø—á8 A — ¨ Ÿ © ¨ © ˆ¹æ Á¸äöÿª Àc ª ýÿ ø—¨B —« ý þ ÿ ýöÿ þ c c ˆ ¢cµ
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ªÁصø —° ±—¶ ø—ät A — ¬ Ÿ ¬ ˆ¹ Á¸ ‚Ø€Ž ˜—Ä öÿ®¯ ƒØ „Ø ¯ IL PS X—ï 0—ô « « €Ž ƒØø—Éi —Ì € � ‚„¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• €öÿ �Ì�Ì� k Î�´»¸� Ï�Ç»¸� Ð�໸� Ñ�À ¸� Ò�ÿ»¸� f'EwÚ]¾å ‚œØžØ ŸØÈ Øˆ ¡Ø¢Ø´ ‰‰Nµý¤Ãöÿ ƒØ « —å «
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¯Áصø —Ñ ´¬—ñ ùŸ•º´ üº0IŸ�º - Response future from [`MapResult`] services.Á ï@ú ü÷)N²Ç é|® — ± Ÿ ² ± ² ˆ¹¢ Á¸¡öÿ �“¨$Ö[,0 ³ÆÉ ÍР៓» (—î ê ° ° €ŽY ös üs ê ù ¸{2 í — ¶ Ÿ · ¶ · ˆ¹V Á¸UöÿÅÇ jm qt ù Ú•S Á Ý• ê ƒ ƒöÿ — ¹ Ÿ º º ¹ ’– ˆ¹ü Á¸û
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» » ¬o ¿š7 ê QhÖíÈË,à ¾o©Ù‚â QhÖíÈË,à ¿1¢ÓÝ 9< @C ‰mê » » „¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• ¾o)Æ6)Æ6 ȉ )É6š7)% ÚŸ Ãs½>©Ù‚âù¥¨ÝÕ 1¥¨Õ ÷i ®x ¾o Á —  Ÿ à Á  à ëÕJ ÑØI åš1¥¤Þ ‚�ù¤ÿÈ �Æ
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Ä1¥ÓÝ ÏÒ ÖÙ ‰ê À À „¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• ¾oÒœ ù§•‡› 1§ù… 9 Ü} Æ„¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• Æöÿ » » ¬o ¿š7 ê QhÖíÈË,à ÆÁصø µ 1§°‡ µ
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ÅÁصø!§Å‡ %'ù©•‡› 1©ù… Y ›� È„¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• Èöÿ À À Üo Äš7 ê â²i¦¥Pá
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ÇÁصø!©Å‡ %'ù«å½0 óA«ñ½ ¾o Ê — Ë Ÿ Ì Ë Ê Ì ëÕ� ÑØŽ É É »p ÍÛp ê Κ7 ê B sŠ°M™û ¾o©Ù‚â B sŠ°M™û ÍÎ1«ú½
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ù ݈t cê É É Òœù«Ã¿á ó ¾o Ð — Ñ Ÿ Ò Ò Ñ Ð ëÕª ÑØ© “í)) *¤Ð
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©ûé ôy�ê ê Ó Ó ÿµÁûé Ó ÿµ ÿµ" ùÏê6 ô ¥ Õ Õ Ã¶ Ôê ‡Ó
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¹×ê íÌ ù‘ëF ô — × Ÿ Ø × Ø ˆ¹ Á¸ÿ
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öÿ Ôƒ ü{: 7 [`Service`] returned by the [`map_future`] combinator.Á ¶ú üº7е BLŽ ¤ Ú — Û Û Ú ÀÀ ˜ ëÕ ›—� ã‡" î}pO ÜÝ(* -/ D¤,¤� Ù Ù ¯Ë$² ²� Ù Ù ©Ù(°û ü ¤ ß — à à ß ÀÀ± ëÕ¯ ÝË°˜ úç°›—�á Ù á ÜÞ áã |~ „ „—� —� Þ °û Þ
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á¯Ë©ÙÔäâ üô6 3 A [`Layer`] that produces a [`MapFuture`] service.Á «ú ü¯!¬ä Dtí — ã ã ˆ¹ ü»‚ ±2}o
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kÒÅ ä $… …� â â ÁØ(²Ú ý — æ æ ˆ¹o ¯…²ü»‚ç Ù ç ŠŒ PR … …»‚ »‚ å ²Ú å
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çÁØ£ù¼•º´ ü®SI¼�º P A [`Future`] consuming a [`Service`] and request, waiting until the [`Service`]Á ü†Fd C is ready, and then calling [`Service::call`] with the request, andÁ üÑ µ waiting for that [`Future`].Á Š<– ¤ é & ê é ê ÀÀ ž ¥Œ ¯ šº yºŸ£ ¾ƒ ¦s�˜“kø ë24 79 ἓ» ,ͼ è è ×…(½ÿ ‹ ¤ í & î í î ÀÀ£ ¥Œ¡ üÕ½ž šº © Á¼ ½¯¾ƒï Àc ï ÔÖ ÙÛ ‚„ † ‡ ˆ †¾ƒ ‡ c c ˆ ¢cµ
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!¾Œ– ÓÖ ÚÝ ùÀ¨ÝÕ 1À¨Õ “Q¾Ýt ¾o ø ¤ ù & ú ú ø ù ¾õ` Í첄 h &à̲„ } ÿƒ ¾o1À¤Þ ÚÅ
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ù¿ÿÈ ²„ ¾o ÷ ÷ ¬o ûº ¼ ØW™ÎÐI
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Ö û1ÀÓÝ �Ú¼ ÷ ÷ „¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• ¾oÖ„ùèÝÕ 1Ã¨Õ •i¾®x ¾o ý ¤ þ & ÿ þ ÿ ý ¾õí ¬¹ì ¼¹ö ι1Ã¤Þ ÚÅ
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ùÂÿÈ î¹
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ü ü Üo €º ¼ à|r*@ ¾oà̲„ à|r*@ €1ÃÓÝ y| €ƒ ‰E¼ ü ü „¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• ¾oÖ„ ùÅ•‡› 1Åù… 9¾Ü} ‚„¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• ‚¾ƒ ÷ ÷ ¬o ûº ¼ ØW™ÎÐI
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�¯Ëñƒ!ÅŇ %'ùÇ•‡› 1Çù… Y¾›� „„¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• „¾ƒ ü ü Üo €º ¼ à|r*@ „¯Ëñƒ ñ 1Ç°‡ ñ
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ƒ¯Ëñƒ!ÇŇ %'ùÉå½0 ‘AÉñ½ ¾o † ¤ ‡ & ˆ † ‡ ˆ ¾õ9 ¬¹8 ¼¹B … … »p ‰Ûp ¼ Šº ¼ —¤ûðÓ ¾oà̲„ —¤ûðÓ ‰Š1Éú½ ´· »¾ ùÉܾ< �Éܾ ¼ … … ‰Ð
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ù¾Ýˆt ¬¼ … … Ö„ùÉÃ¿á ‘ ¾o Œ ¤ � & Ž Ž Œ � ¾õ[ ¬¹Z ¼¹d “í)) *¤Ð
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,ˆ Úˆ3Clœ†’à ( ÁÉŒÁ ÿƒ 1ÉÈ¿ Ã Æ Ê Í ©Ëûé ’yË�ê ¼ � � ÿµÁËûé � ÿµ ÿµ" ùËÏê6 ’ ¥ ‘ ‘ ö ËÔê ‡Ó
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ùÑÛ¿µ ž,Ÿ¼ ¤ – & — — – ÀÀ ¥ ¥Œ ¶ šº yÏŸ£ ×… Pu¾“€ Y˜›�ž ™š œž KM PR ùÑýÀw žDż • • ×…‰Ñ¹Á ܼ • • ¯Ë ð¼ • • û¿^ ž4•¼ • • ×…W ½¼ • • çÁAÑýÀ ž$༠• • ×…# ¼ • • ×…ùÓ¨ÝÕ 1Ó¨Õ £L‹¼ ¾o ¤ ¡ & ¢ ¡ ¢ ¾õ· ¬¹¶ ¼¹yÏä¥ Ö„ ¾o1Ó¤Þ ÚÅ
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ùÒþЄ î¹ à̲„ & ¾o% Ÿ £ ÷« ¤‡¬ ¼ ¥’¬ ¼ ¦ «x §¥¬ ¼ ¨ ©°¬ ü0k#ì|Š ¾oà̲„ ü0k#ì|Š £¦¨© ¤¥ §© 1ÓÓÝ ¹¼ Àà ùÒºÐú £s¼ Ÿ Ÿ þÌm¼ Ÿ Ÿ ¾oàÌ8t¼ Ÿ Ÿ ¾oۼݼ޼© ß¼ à¼ÛἈ cSñŸ«‡zÙ²„« £¿¼ Ÿ Ÿ þ̺¿¼ Ÿ Ÿ „¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• ¾oêÌAҺР£÷¼ Ÿ Ÿ þÌ" ¼ Ÿ Ÿ þÌY×�¡ ×–¡ ¼ ù׬¡2 ¢ ¤ ¬ & ¬ ÀÀ• ¥Œ” šº Þ×…® ° ´· ùØ’œ› 1Øöš 9×ã ¼ ¯„¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• ¯×… Ÿ £ ÷« ¤‡¬ ¼ ¥’¬ ¼ ¦ «x §¥¬ ¼ ¨ ©°¬ ü0k#ì|Š ¯¯Ëñƒ « 1Øœ «
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®¯Ëñƒ!ØÂœ %'ùÜå½0 ªAÜñ½ ¼ ¾o ± ¤ ² & ³ ² ± ³ ¾õW ¬¹V ¼¹ ° ° »p ´Ûp ¼ µ÷« ¼ ¶«x ¼ ·°¬ ¼ ÆîªrJã( ¾oà̲„ ÆîªrJã( ´µ¶·1Üú½ ðó ÷ú ùÜܾ< �Üܾ ¼ ° ° ‰Ð
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ù×ɱõ ̼ ° ° 00 1¾ƒ 3ˆ ‰4ä\’ÎMàÌ00 1¾ƒ 3ˆ ‰4ä\’ÎM¬Ï‚ï¼ ° ° ê̛˼ ° ° ùÜÃ¿á ª ¾o ¹ ¤ º & » º » ¹ ¾õ* ¬¹) ¼¹s “í)) *¤Ð
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,ˆ Úˆ3Clœ†ÛÕ ( ÁÜŒÁ Ö„ 1ÜÈ¿ ’• ™œ ©àûé «yà�ê ¼ ¼ ¼ ÿµÁàûé ¼ ÿµ ÿµ" ùàÏê6 « ¥ ¾ ¾ ö àÔê ‡Ó
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¹à×ê íÌ ùà‘ëF « ¤ À & Á Á À ÀÀ‡ ¥Œ† šº Ð×… œ Ÿ £ ¦ lª ü= : Error returned if the inner [`Service`] has not been set.Á Vú üZ ˆ“ L$– ä† µk9Wš4 Ã Ä ä† lª6 Ú ä† Â Â
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à ›Ú   (éƒ ´ ä†Æ Àc Æ $& Š ‹ Œ Šä† ‹ c c ˆ ¢cµ
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Æ É±Ïùô•º´ ü”--Iô�º * Response future returned by [`Optional`].Á Æ-=ú üÎ'-K $ [`Optional`]: crate::util::OptionalÁ Âtš- ¥ È È Ã¶ ©-³‡ ƒ/(}¦¦" É áô“» ,Å-ã Ç Ç àÅ(õƒ- à ¥ Ë Ë Ã¶s �æ õ©-³‡Ì Àc Ì Ž� PR � Ž � �³‡ Ž c c ˆ ¢cµ
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ÌíÌú± Yöös öüs ã ùö¸{2 Á ¥ Ï Ï Ã¶�³‡ÚÜ œŸ ùöÚ•S ÁöÝ• ã � �³‡ ¥ Ñ Ñ ö’– ö
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!öŒ– (+ ùø¨ÝÕ 1ø¨Õ ËQöÝt ¾o Ó ¥ Ô Ó Ô ÌË– í‡ ¾o1ø¤Þ ÉÏù÷ÿÈ Ò Ò ¬o Õš7 ã ‰�ç 2ÈÌb ¾o¥Ì ‰�ç 2ÈÌb Õ1øÓÝ pïã Ò Ò „¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• ¾o ‡ ùû¨ÝÕ 1û¨Õ Íiö®x ¾o × ¥ Ø Ø × ÌËÑ ¬æ1û¤Þ ÉÏùúÿÈ Ö Ö Üo Ùš7 ã %Õó¯ ¾o¥Ì %Õó¯ Ù1ûÓÝ EH p#ã Ö Ö „¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• ¾o ‡ ùý•‡› 1ýù… 9öÜ} Û„¾„¾ ¥Î †¾‰ ˜X $ ]È=„kt• Û³‡ Ò Ò ¬o Õš7 ã ‰�ç 2ÈÌb ÛíÌ Î 1ý°‡ Î
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# ServiceÁ Ìú üÐO L A [`Service`] is a trait representing an asynchronous function of a requestÁ ü S P to a response. It is similar to `async fn(Request) -> Result<Response, Error>`.Á ôú üøI F A [`Service`] is typically bound to a single transport, such as a TCPÁ üÂN K connection. It defines how _all_ inbound or outbound requests are handledÁ ¼‘ by that connection.Á ©ú üL I [builder]: https://doc.rust-lang.org/1.0.0/style/ownership/builders.htmlÁ úú \þ # OrderÁ Šú üŽP M The order in which layers are added impacts how requests are handled. LayersÁ üßO L that are added first will be called with the request first. The argument toÁ ü¯. + `service` will be last to see the request.Á Þú <âš� üêH E # // this (and other) doctest is ignored because we don't have a wayÁ ü³D A # // to say that it should only be run with cfg(feature = "...")Á Ìø¼ó ü’ )àó ü¼ 8 5 # #[cfg(all(feature = "buffer", feature = "limit"))]Á üõ móô Ìã
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� ƒ � provided by this crateÁ /https://docs.rs/warp/0.2.5/warp/fn.service.htmlÁ tower-lspÁ "https://crates.io/crates/tower-lspÁ ©( crate::limitÁ load balancingÁ utilitiesÁ crate::ServiceExtÁ
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