3781 lines
768 KiB
Plaintext
3781 lines
768 KiB
Plaintext
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rust
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>þ #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 $¨ûib‚ -cf21ca6f2bb15dcdÁë
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‹ás «LÖ€îâƒ×ɯŒ -ee6f3747e38367f0Á tokioÁâYH+ÄS£ü4§…>ˆº$ -886576ce57e45364Á pin_project_liteÁ·x¼+Ä`·á¨›�t—¸Íœ -2dc344ecc91b59efÁ parking_lotÁ,kÞÖGϹ˾ϷxwOÜ -5fc2c3fdec45feedÁ lock_apiÁEcÓŽ/ÅS}sw‡A$P -0e8055cd433fa267Á
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scopeguardÁ’‰‘p ÒÞa¢ßöéqÓB -29f0bdb2ea82739eÁ parking_lot_coreÁªôqu�´<Üb3 Èn~É -385dbf21a0d1611bÁ smallvecÁØNôCt€ïAGV– -97fd81655f68edefÁ ®f©¾/ô)c§{õa“â‘ -a3906971a93fd1b8Á –WÉ?A©ú¡E2¯ëäu -8e0657b9e365f274Á mioÁU»"‘¦Ï¹Ç8³<u�½ -325017fc6dce34b0Á bytesÁz"ˆ9äš
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2s÷ "X"“ -f60c5f60586b21edÁ tokio_macrosÁ€§)£Í‰ÔœxðÁŠ–ü´ -a4c6e56303f3349dÁ socket2Áüß<%ñÁyðUe› -fe803a4340fa19d8Á signal_hook_registryÁ{lz…<Bžš;ë®
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å -cb4f4a08e32ec862Á errnoÁðšÿçNš&^
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�:Ón -ef17a36a98ab2a47Á
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tower_serviceÁ:`¡{¶aÛ¬í"aô -3b2010b03e380b78Á tower_layerÁX*�ø6êWHNᕈf§ • -ee72e88a461fccddÁ futures_coreÁÍ© û4ù†ŽNx¼ -a28fb4b6ab5a68eeÁ futures_utilÁ¿—‰ ˆÝ!4 _ò/"™I -c0d3c2c1cc8a32daÁ futures_taskÁ¡™�£!€34¢è¸Zbå3 -a6639629ff41f298Á sync_wrapperÁžEÖsPÍÿ
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"<„:Ay -5431a0c56a16c6a2Á balanceÁ<»9 »èœ�9 bufferÁ4ç9 »…”Ê9 discoverÁD”: »¡¤õ9 filterÁ4Á: »¿”¤: hedgeÁ,ë: »ÛŒÏ: limitÁ,”; »öŒø: ¬$¼; »¬„¡; load_shedÁLè; » load-shedÁ¬È; + testsÁ,û‚ $ð ready_cacheÁ\Ã< » ready-cacheÁ¼¡< reconnectÁLö< »“¬Ö< �Ï,™0‚ $Ž0°Ï,×1‚ $Ì1÷ _obj_safeÁLì‚ $â spawn_readyÁ\Ò= » spawn-readyÁ¼°= steerÁ,�> »£Œå= ÚÏ,‡,‚ $ü+€
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sample_floyd2Ál߻蜻€
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Ï,÷ ‚ $ì À macrosÁ
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opaque_futureÁ makeÁ make_connectionÁ MakeConnectionÁ å
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ConnectionÁ ErrorÁ FutureÁ
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poll_readyÁ Æ ¤ å ” å œ ¹ Æ Æ make_serviceÁ " """""""" sharedÁ + +++++ 1¤ 1æ +4¤ 4¥ 4 ResponseÁ 4 4¹ 4Æ 4Ñ " MakeServiceÁ <å < RequestÁ <� < < ServiceÁ < MakeErrorÁ <¹ <Æ <¥ < into_serviceÁ <
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as_serviceÁ " Hž H¤ Hå Há "Mž M¤ Må Má M� M Mý M‹ M¹ MÆ M¥ " IntoServiceÁ Yž Yá Y» Y _markerÁ "^ž ^á ^ƒ "bž bá b× "fž f¤ få fá f� f f¹ fÆ fÑ " AsServiceÁ p 'aÁ pž pá p» pì "vž vá v× "zž z¤ zå zá z� z z¹ zÆ zÑ futureÁ Š retryÁ Œ backoffÁ � ������� MakeBackoffÁ • BackoffÁ • make_backoffÁ �ü ˜¹ ˜ next_backoffÁ � ›£ ›æ �ž£ žü ž‹ �¢£ ¢ baseÁ ¢ jitterÁ �¦£ ¦¹ ¦¯ �ª> �¬× �Œ budgetÁ ¯
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tps_budgetÁ ° °°°°°°°°° ° TpsBudgetÁ »
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generationÁ » reserveÁ » slotsÁ » windowÁ » writerÁ » deposit_amountÁ » withdraw_amountÁ ° Ãæ à expireÁ à sumÁ Æ Ã putÁ à try_getÁ °Ê depositÁ Ê withdrawÁ °Í> °Ï× ¯ ¯ BudgetÁ Òû ÒŠ! Œ˜ Õ ÕÕÕÕÕÕÕÕÕ Õ
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Õ á¡ á¤ áá áæ Õæ¡ æ¤ æá æ° æŠ Œ layerÁ ì ìì ï¡ ïæ ìò¡ ò¤ òý òç" Œ policyÁ ÷ ÷ PolicyÁ ù ReqÁ ù ResÁ ù– ù¹ ùª ù
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clone_requestÁ Œ ŒŒŒŒŒŒŒŒ ˆ¡ ˆ¤ ˆæ ˆ get_refÁ ˆ get_mutÁ ˆ
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into_innerÁ Œ�¡ �¤ �á �� � �¹ �Æ �Ñ timeoutÁ ˜ errorÁ ™ ™™™ �æ ™Ÿ× ™˜˜ ¢ ¢¢¢¢¢¢¢¢¢ ¬¥ ¬æ ¢¯— ¯¥ ¯– ¯° ¯Š ˜ç" µ µµµ ¹æ µ»¤ »ý »ç" ˜ ˜˜˜˜˜˜˜ Æ¥ Ææ Æá$ Æð$ Æÿ$ ˜Ì¤ Ìá Ì� Ì Ì¹ ÌÆ ÌÑ utilÁ Ô¶ Õ ÕÕÕÕÕÕÕÕÕ Õ
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Õ Õ â¤ â— â× Õæ F1Á æ F2Á æŸ ææ ÕëÕ) ëß) ëŸ ë× ÕðÕ) ðß) ðŸ ð° ðŠ Õö¤ ö— öæ öç" Õû¤ û— ûá û FutÁ û� û û¹ ûÆ ûÑ Õ…— …æ Õˆ¤ ˆ— ˆý ˆç" Ô boxedÁ �ç" Ž ŽŽŽŽŽŽŽŽ BoxLayerÁ — InÁ —¥ —¦ —– —ú+ Ž �Ç, �¥ �¦ �– �æ ¢� ¢ Ž¥Ç, ¥¥ ¥¦ ¥– ¥ý ¥ç" Ž¬Ç, ¬¥ ¬¦ ¬– ¬ƒ Ž²Ç, ²¥ ²¦ ²– ²× � layer_cloneÁ ¸ ¸¸¸¸¸¸¸¸ BoxCloneServiceLayerÁ ÁÇ, Á¥ Á¦ Á– Áú+ ¸ ÇÇ, Ç¥ Ǧ Ç– Çæ Ì� Ì ¸ÏÇ, Ï¥ Ϧ Ï– Ïý Ïç" ¸ÖÇ, Ö¥ Ö¦ Ö– Öƒ ¸ÜÇ, Ü¥ ܦ Ü– Ü× � layer_clone_syncÁ â ââââââââ BoxCloneSyncServiceLayerÁ ëÇ, ë¥ ë¦ ë– ëú+ â ñÇ, ñ¥ ñ¦ ñ– ñæ ö� ö âùÇ, ù¥ ù¦ ù– ùý ùç" â€Ç, €¥ €¦ €– €ƒ â†Ç, †¥ †¦ †– †× �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 ¦¤ ¦ ¢ç" ©¤ Œ«¥ «¦ «– «� « «¹ «Æ «Ñ Œ´¥ ´¦ ´– ´× � unsyncÁ ¹ ¹¹¹¹¹¹¹¹¹ ¹
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¹ UnsyncBoxServiceÁ Å¥ Ŧ Å– ÅÆ4 ¹ UnsyncBoxFutureÁ Ê¥ Ê– ¹ Í¥ ͦ Í– Íæ Ѥ Íç" Ó¤ ¹Õ¥ Õ¦ Õ– Õ� Õ Õ¹ ÕÆ ÕÑ ¹Þ¥ Þ¦ Þ– Þ× ¹ã¤ ãá ã� ã ã¹ ãÆ 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 ‡¤ ‡ ƒç" Š¤ ñŒ¥ Œ¦ Œ– Œ� Œ Œ¹ ŒÆ ŒÑ ñ•¥ •¦ •– •ƒ ñ CloneServiceÁ š£ š clone_boxÁ ñ�£ �¥ �”< ñ¡¥ ¡¦ ¡– ¡× Ô boxed_clone_syncÁ ¦ ¦¦¦¦¦¦¦¦¦ ¦
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¦ BoxCloneSyncServiceÁ ²
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²¥ ²¦ ²– ²ˆ ¦ ¸¥ ¸¦ ¸– ¸æ ¼¤ ¼ ¸ç" ¿¤ ¦Á¥ Á¦ Á– Á� Á Á¹ ÁÆ ÁÑ ¦Ê¥ ʦ Ê– ʃ ¦ø; Ï£ Ï”< ¦Ò£ Ò¥ Ò”< ¦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 ÜòÐ@ ò¤ ò¢ òæ òÿ$ ò take_serviceÁ ò unorderedÁ ÜúÐ@ ú¤ ú¢ ú› ú poll_nextÁ Û orderedÁ € €€€€€€€€€ €
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€ ŒÐ@ Œ¤ Œæ Œÿ$ ŒÙA ŒíA €“Ð@ “¤ “› “£B €˜— ˜ˆA ˜˜A ˜Š ÛíA � ��������� �
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� ©Ð@ ©¤ ©æ ©ÿ$ ©ÙA �¯Ð@ ¯¤ ¯› ¯£B �´— ´ˆA ´˜A ´Š Û ÛÛÔ eitherÁ ¼ ¼¼¼¼¼¼¼¼¼ Æ’ Æ“ Æá Æ� Æ Æ¹ ÆÆ ÆÑ ¼Ï’ Ï“ Ï° ÏŠ ¼Ô¤ Ô’ Ô“ Ôý Ôç" Ô future_serviceÁ Ú ÚÚÚÚÚÚÚÚ�G ã— ã¤ ã£ ã– Ú è— è¤ èæ Úì— ì¤ ì× Úð— ð¤ ð× Úô— ô¤ ô£ ô– ô� ô ô¹ ôÆ ôÑ ÔÙ þ þþþþþþþþþ ˆ¤ ˆ— ˆ× þŒ¤ Œ— Œæ Œç" þ‘¤ ‘— ‘á ‘ ‘� ‘‘¹ ‘Æ ‘Ñ þ›— ›æ þž¤ ž— žý žç" Ô map_requestÁ £ ££££££ ª¤ ª— ª× £®¤ ®— ®æ ®ç" £³¤ ³— ³ R1Á ³ R2Á ³� ³ ³¹ ³Æ ³Ñ £½— ½æ £À¤ À— Àý Àç" Ô map_responseÁ Å ÅÅÅÅÅÅÅÅŠϤ Ï— Ï× ÅÓ¤ Ó— Óæ Óç" Åؤ Ø— Øá Ø� Ø�Ø Ø¹ ØÆ ØÑ Åâ— âæ Åå¤ å— åý åç" Ô
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map_resultÁ ê êêêêêêêêê ô¤ ô— ô× êø¤ ø— øæ øç" êý¤ ý— ýá ý� ý ý�ýý¹ ýÆ ýÑ êˆ— ˆæ ꋤ ‹— ‹ý ‹ç" Ô
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map_futureÁ � �������� ™¤ ™— ™æ ™ç" ™á$ ™ð$ ™ÿ$ �¡£ ¡¤ ¡— ¡¥ ¡– ¡�+ ¡� ¡ ¡¹ ¡Æ ¡Ñ �¤ — × �±— ±æ �´¤ ´— ´ý ´ç" �¹— ¹× Ô oneshotÁ ¼ ¼¼¼¼¼¼¼¼¼ ¼ Ǥ ÇÙ# Ç not_readyÁ Ç calledÁ ¼Ì¤ ÌÙ# Ì× ¼Ð¤ ÐÙ# Ðæ ¼Ô¤ ÔÙ# Ô° ÔŠ Ô optionalÁ Ùä% Ú ÚÚÚ Þæ Úà× ÚÙ˜ ã ãããããããã ì¥ ìæ ãï— ï¥ ï– ï° ïŠ Ù ÙÙÙÙÙ ú¥ úæ üá Ùþ¥ þá þ� þ þ¹ þÆ þÑ … Ô readyÁ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
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‡ ReadyOneshotÁ “ ¥ “ á “ Æ4 “ _pÁ ‡ ˜ ¥ ˜ á ‡ › ¥ › á › æ ‡ Ÿ ¥ Ÿ á Ÿ ° Ÿ Š ‡ ¤ ¥ ¤ á ¤ × ‡ È ¨
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¨ ÿ ¨ ¥ ¨ á ¨ ˆ ‡ ® ¥ ® á ‡ ± ÿ ± ¥ ± á ± æ ‡ ¶ ÿ ¶ ¥ ¶ á ¶ ° ¶ Š ‡ ¼ ¥ ¼ á ¼ × Ô
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service_fnÁ À À À À À À À “[ Ç ¥ À É ¥ É × À Ì ¥ Ì — Ì á Ì £ Ì – Ì � Ì Ì ¹ Ì Æ Ì Ñ Ô thenÁ × × × × × × × × × × ×
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next_rangeÁ €
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ƒ � ƒ ç" … ¥ ƒ ‹e ‡ ¥ ƒ layer_fnÁ ‰ — ƒ ª ‹ ¡ ƒ Õ% ƒ ˜K Ž — Ž L Ž ªL ƒ –M ’ — ƒ Ù ” — ƒ °Q – — ƒ ½\ ˜ — ƒ ¶ š — ƒ O œ — ƒ ÿ$ ƒ serviceÁ Ÿ ¤ ƒ “[ ¡ — ƒ check_cloneÁ ƒ check_service_cloneÁ ¤ ¤ ƒ
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· ¤ · � · ý · ç" ç" ¼ ¼ ¼ ¼ ¼ ã( Á Á Á sealedÁ Ì SealedÁ Í ¥ BoxErrorÁ + SharedÁ Ð ¤ Ð Ñg +Ó ¤ Ó × +Ö ¤ Ö ƒ +Ù ¤ +Û ¤ Û æ +Þ ¤ Þ × +á ¤ á ° á Š + SharedFutureÁ å ¤ å Æ4 + è é ¤ è __assert_not_repr_packedÁ ë ¤ è
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ProjectionÁ í '__pinÁ í ¤ í Æ4 è
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ProjectionRefÁ ñ êl ñ ¤ ñ Æ4 é projectÁ õ êl é project_refÁ ÷ êl è __OriginÁ ù êl ù ¤ ù __dummy_lifetimeÁ ù Æ4 è þ êl þ ¤ è MustNotImplDropÁ è ‚ ¥ è „ ¤ � ExponentialBackoffMakerÁ † £ † minÁ † maxÁ † Ž † Ù^ �Œ £ Œ × �� £ � ƒ � ExponentialBackoffÁ ’ £ ’ ”o ’ Ÿo ’ Ž ’ Ù^ ’
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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 © ¡ © ¤ © á © requestÁ © ª © º Õ° ¡ ° ¤ ° á ° × Õ µ ¶ ¡ ¶ ¤ ¶ á µ °l º ¡ º ¤ º á µ Øl ¾ êl ¾ ¡ ¾ ¤ ¾ á ¾ óq ¾ ª ¾ º µ ˆm Æ êl Æ ¡ Æ ¤ Æ á Æ óq Æ ª Æ º ¶ µm Î êl ¶ Ìm Ð êl µ çm Ò êl Ò ¡ Ò ¤ Ò á Ò ‡n Ò óq Ò ª Ò º µ Û êl Û ¡ Û ¤ Û á µ ¼n µ á ¥ µ ã ¡ ã ¤ ã á Õ StateÁ ç — ç ¡ ç CalledÁ ê ˜ ç WaitingÁ ì waitingÁ ç RetryingÁ î
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Õð — ð ¡ ð × Õ StateProjÁ ô êl ô — ô ¡ ô ×u ø ˜ ô íu ú üu ô ‹v ü
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Ç –µt¬@ Ö È È\ªA < É ‰ LayerÁ,ÜA $Ú Ê ý<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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P M a function taking a [`Service`] of one type and returning a [`Service`] of aÁ üµ N K different type. The [`ServiceBuilder`] type is used to add middleware to aÁ ü„ 5 2 service by composing it with multiple [`Layer`]s.Á º ú Ô¾ ## The Tower EcosystemÁ Ù ú üÝ - * Tower is made up of the following crates:Á ‹
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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$< 9 * [`warp`]: A lightweight, composable web framework. SeeÁ ü˜%D A [here][warp-service] for details on using [`warp`] with Tower.Á üÝ%5 2 * [`tower-lsp`]: implementations of the [LanguageÁ ü“&+ ( Serv
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AsyncWriteÁTo Å ý<� # ¬ “œ †L8 y{jlLX UW=?´€ 3ü½3 ü™> ; The [`MakeConnection`] trait is used to create transports.Á Ø ú üÜH E The goal of this service is to allow composable methods for creatingÁ ü¥G D `AsyncRead + AsyncWrite` transports. This could mean creating a TLSÁ üíO L based connection or using some other method to authenticate the connection.Á tÇ å Îì ü½ú Í °³áÈ Œß ÍìãÈ 4Ö ¨³> ¼³. ¨³J ¼³: Íì°³ãÈ ü¦( ’›´ L· Å›´ Tà “´) ¯´ ¿´ Íì°³ãÈ \† â´ Íì°³ãÈ üÑD ‚ØŒµ üÞ6 ŒµƒØ Ö¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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;ÛÈÑÉ$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 = á > = > < ¨³üÛÓ Í °³ãÈöÌ Ìƒ г4ñ ÍìöÌ <ù < ¨³K —Ó6 ¨³W —ÓB?@ABCDEFG?@ABCDEFG Íì°³ãÈöÌ ? tÊ ƒÔ Íì°³ãÈöÌ @ \… ©Ô Íì°³ãÈöÌ A üÌO #×ÔöÌ üÚ@ ×ÔöÌ# ‹ÔÌë ×ÔöÌ#
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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 <£ Êd² °³ Y Y Å \» " ]ì " MeO¥ ŠÂ°³öÌ < < Íì°³ ,û
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F°³ãÈöÌ$¿ üñ W üíc ` Convert this [`MakeService`] into a [`Service`] without consuming the original [`MakeService`].Á Õ ú lÝ Žâ <ï Ê üû! ²â ¼¡ Üâ ü½! ýâ Ô㠧㠂 ú ŒŠ Öã l ðã ´² †ä üÍ< 9 let mut make_service = service_fn(|make_req: ()| async {Á üŽ< èä üÏ$ ®å \ø Ûå <ˆ ïå ” ú üœ1 Œæ üÒ, ) let mut svc = make_service.as_service();Á ƒ ú Ì‹ Šç ü© 2 ç à ú ¼è ôç ü„ = •è Æ ú üÎ 5 2 // The original `MakeService` is still accessibleÁ üˆ ? < let new_svc = make_service.make_service(()).await.unwrap();Á DÌ Ûè <Ù ìè <å ÊTô ì ì°³ p p ï t» " uì " DAÜ0 i ì°³öÌ < ÿ < êê,Â
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€Ë#4° ù �ÅqtË © Œ ‚±š\ñ Œ ƒk<Ž Ì� Œ …·$— œØ Œ †ý<± # Œ ‡|0 ü N K This module contains generic [backoff] utilities to be used with the retryÁ TO layer.Á Zú ü^M J The [`Backoff`] trait is a generic way to represent backoffs that can useÁ œ¬ any timer type.Á Àú üÄ? < [`ExponentialBackoffMaker`] implements the maker type for Á ü„N K [`ExponentialBackoff`] which implements the [`Backoff`] trait and providesÁ üÓA > a batteries included exponential backoff and jitter strategy.Á •ú ü™@ = [backoff]: https://en.wikipedia.org/wiki/Exponential_backoffÁ <8 •˜† ’ Ÿ t<é Äc � Ž¹4ƒ ‚Ø � �¦¢Dš Ö � �¬q$¯ øc � ‘¶´LÍ Ì � “‚_ Ø ‡
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� ”Œßƒœötœ�c\¨S„ºCE24¬› üß; 8 Trait used to construct [`Backoff`] trait implementors.Á \¥ • • ¨³ü›¾ • ¨³ ¨³ –—–— Íì°³ – ´è ˜¿¡ <ö ·¡ Ï¡ — ¬è ü·, ) The backoff type produced by this maker.Á<í • • ü«, ü„" Constructs a new backoff type.Ád® ‚ ‚°³¿¡ • » •
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—°³$ÀŒµ üÛH E A backoff trait where a single mutable reference represents a singleÁ ü¤J G backoff session. Implementors must also implement [`Clone`] which willÁ üïE B reset the backoff back to the default state for the next session.Á <¿ ˜ ˜ ¨³üµ� ˜ ¨³ ¨³ ™š™š Íì°³ ™ ü¯ ! ‚Ø‘¦ œ¼ ‘¦ƒØ \à ‰¦- ¢¦! ³¦ š ü¯ üÍK H The future associated with each backoff. This usually will be some sortÁ l�
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$ã.± é.üÚ/) ¥Ñ 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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! 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 ÏË 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 éÏ ,Ï ¯Ç <Õ ÃŠ 4I °Ò© L‡ » Ñ”Þ ü 8 5 Transactions Per Minute (Tps) Budget implementationsÁ Tæ »¤ × I ¤, ° ² AtomicIsizeÁ\k Ýà ° µ®Dx ¼À ° ¶¤,‹ µ> ° ·¦¢D£ Ö ° ¸ InstantÁ<Á âe ° ¹¸!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† µÒ ¥ ôÐ"¨ ¼½¾¿ÀÁÂì–T–° » » µ>µ> ¤ ·>Æ4£> ¸> poisonÁ£> ¹> dataÁ£> Ë»™z™g—ôÑtê<ê° » » Ì©,©° » » �� žÛ‹ ¡ˆˆ ¢‰ˆ l }.xÏ
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° » » tù µÒÄÅÆÈÉ 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 š£µÒ à Ã
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„� ü“P Ä× ä ú üè& # [module-level documentation]: selfÁ 4™ Ò Ò ¨³ü�Å Ò ¨³ ¨³ 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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Ó°³$” 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 • •°³ Ò Ã Ò
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üë# ü±5 2 Creates a new [`RetryLayer`] from a retry policy.Á ø ŽÔŠ× ï ï
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ñŽÔ¸#K�ü¸9 ¡ ó ¤ ô ô ó áô ½ çò À ØŽÔ ,ëŠ×õö $Ü $Ý ö 24 79 dø<ý ò ò Ý×ü™,,œ ™ ™Š× ŒÊŠ×ŒÊ $Ü ò ¢ ò
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öŽÔŒÊ$£Ñg<©Tl 4pŒù¹4 ‚Ø ÷ øœìæ ü@ = A "retry policy" to classify if a request should be retried.Á [ú l_Žâ mú <qÊ ìy use tower::retry::Policy;Á ¤— use std::future;Á ¬ú ´°÷Å ´Ç–Æ Þú Üâ struct Attempts(usize);Á þú ü‚. + impl<E> Policy<Req, Res, E> for Attempts {Á ü±(…È Úú üÞaÃÈ ÔÀÉ ÔÛÐÉ üö8ôÉ ü¯( % // so don't retry...Á ÄØ®Ë ”ñ },Á Ü„éË ü 6ŽÌ 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 ¬¬¼Î ŒÂÏË lÔÓÏ LâéÏ ìú üð?ˆÐ ì° ÐÐ LÎ éÏ ,Ø ¯Ç <Þ ÃŠ 4ð ù Ù# ú ä# û – ü ú ü û ù ¨³üæ Ò Íìš� ÷ Íìä# ü Íìžá �
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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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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°³ ›š� œÖ¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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þ°³š��Šžá$ξ© 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 �°³ žš� ¤½ ù ‘ ù
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9 6 Retry the inner service depending on this [`Policy`].Á Î
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% üy#% A boxed [`Layer`] trait object.Á �%ú ü¡V% S [`BoxLayer`] turns a layer into a trait object, allowing both the [`Layer`] itselfÁ üøL% I and the output [`Service`] to be dynamic, while having consistent types.Á Å%ú üÉL% I This [`Layer`] produces [`BoxService`] instances erasing the type of theÁ ü–2% / [`Service`] produced by the wrapped [`Layer`].Á É%ú lÍ%Žâ Û%ú üßd% a `BoxLayer` can, for example, be useful to create layers dynamically that otherwise wouldn't haveÁ üÄC% @ the same types. In this example, we include a [`Timeout`] layerÁ üˆA% > only if an environment variable is set. We can use `BoxLayer`Á üÊD% A to return a consistent type regardless of runtime configuration:Á �%ú <“%Ê ä›% use std::time::Duration;Á ü¸C% @ use tower::{Service, ServiceBuilder, BoxError, util::BoxLayer};Á ü%ú ü€D% A fn common_layer<S, T>() -> BoxLayer<S, T, S::Response, BoxError>Á LÅ% whereÁ üÏ'% $ S: Service<T> + Send + 'static,Á ü÷"% S::Future: Send + 'static,Á üš+% ( S::Error: Into<BoxError> + 'static,Á ,Æ% {Á üÌ+% ( let builder = ServiceBuilder::new()Á üø$% ! .concurrency_limit(100);Á � %ú ü¡ 1% . if std::env::var("SET_TIMEOUT").is_ok() {Á üÓ % let layer = builderÁ üó 1% . .timeout(Duration::from_secs(30))Á ô¥
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'šû ü‹1'Ãû ô½'ýû Ü'ú üà0' - BoxCloneSyncServiceLayer::new(layer)Á „‘'Úü ü¢ 'šû üÂ$'‚ý ôç'ýû †'ú üŠ0'éÁ L»'éÏ ,Å'¯Ç Ë'ú üÏ@'Õž ü�0' - let boxed_clone_sync_layer = common_layer();Á Á'ú üÅ;' 8 let cloned_sync_layer = boxed_clone_sync_layer.clone();Á �'ú ü…Q' N // Using the `BoxCloneSyncServiceLayer` we can create a `BoxCloneSyncService`Á ü×r' o let service: BoxCloneSyncService<Request, Response, BoxError> = ServiceBuilder::new().layer(cloned_sync_layer)Á üÊ+'ò¡ üö.'§¢ \¥'Þ¢ ±'ú üµ,'ÿ¢ â'ú üæ)'Á£ ü�)'ô£ ,º'Å™ üÀ*'´¤ üë!'è¤ �'ú <‘'Ê ™'ú ü�!'ùá ü¿''˜þ üç%'Éþ ü� 'øþ ĸ' Ç, ì ¥ í ¦ î – ï ì í ï î æ€Ñ' õÈ Õ' ÿ€ Ø' ˜Š Û'¤â º é¢) ð68 ;= @B EG üäY',ä'â ë ë †J†J K ‰Jµ �7 ŠJ���7 ‹J¤�7 ·0ØQd�è $ÚŽá $ÜŽá ² ² ³¶= ·ˆ ¦ kO1Š{A®Ñɘážá � Ìì’�üÂ7' Ç, ò ¥ ó ¦ ô – õ ó õ ô ò æ€Ç' õÈ Ë' ÿ€ Î' ˜Š Ñ'¤âö #% (* -/ 24 ü³ò' ü€.' + Create a new [`BoxCloneSyncServiceLayer`].Á º' �…¤â ñ� ÷ ÷ ñ Æ… ¾' ×…Lî' ë…$ú' ü…$�' Œ†<ˆ' —†ü¥#' ¶†d°' ̆L¾' â†$Ë' � �† $Ò' Õ¬,Ù' ó†<á' þ†$–' ™‡<�'
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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(·Ä Þ(ú <â(Ê 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 <® (ïå ¶ (ú üº G( D let service: BoxService<String, String, ()> = BoxService::new(svc);Á ¤‚
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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#éÏ <öÙ#ïå ‚Ú#ú ÜŠÚ#áÐ
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°³ÙËÈÿ€þ�’ Í¥ $Ðß#± Öß#Ÿ¡ £¥ §© « üæñç# üØáH# E Composes a function that transforms futures produced by the service.Á ¥â#ú üâ\# Y This takes a function or closure returning a future computed from the future returned byÁ üŽãV# S the service's [`call`] method, as opposed to the responses produced by the future.Á éã#ú tñã#·Ä „ä#ú <Œä#Ê ü˜ä%#ñÄ
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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#ïå ¥î#ú Üî#áÐ
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<ˆð#ìè <”ð#Ê 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# °³Èÿ Ù Ù £¥ ÜÆ4 � ݱ � ÆXç�Ç°³Èÿ Ñ
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°³ÙËÈÿÉä¢Ù ¶Ù $�ò#± “ò#69 <? 7: 25 üòý˜# üÿóC# @ Convert the service into a [`Service`] + [`Send`] trait object.Á Çô#ú üÏô(# % See [`BoxService`] for more details.Á üô#ú ü„õH# E If `Self` implements the [`Clone`] trait, the [`boxed_clone`] methodÁ üÑõC# @ can be used instead, to produce a boxed service which will alsoÁ Ä™ö# implement [`Clone`].Á ¶ö#ú l¾ö#Žâ Ðö#ú <Øö#Ê üäöM# J use tower::{Service, ServiceExt, BoxError, service_fn, util::BoxService};Á ,¶÷#Å™ ¬À÷#Ó™ ´Ú÷#ñ™ ¬õ÷#�š ü�ø##¯š <·ø#ìè Ãø#ú üËø3# 0 let service = service_fn(|req: Request| async {Á üƒù*# ' Ok::<_, BoxError>(Response::new())Á <²ù#ïå ¾ù#ú üÆùB# ? let service: BoxService<Request, Response, BoxError> = serviceÁ ä�ú#š� ü®ú)#À� |Üú#ò� Tðú#Šž ìÿú#�ž ü¡û*#Äž |Ðû#÷ž Täû#Šž Œóû# .boxed();Á ü‰ü,#ÿ¢ üºü*#´¤ üéü!#è¤ <�ý#Ê ›ý#ú ü£ý #±� üÇý&# # [`boxed_clone`]: Self::boxed_cloneÁ,õý# °³ š š œ4 žÆ4 Œ ™•Ê³Q°ÙË«ß
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°³ÙË$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�#Žâ �‚#ú <‰‚#Ê ü•‚R# O use tower::{Service, ServiceExt, BoxError, service_fn, util::BoxCloneService};Á ,ì‚#Å™ ¬ö‚#Ó™ ´�ƒ#ñ™ ¬«ƒ#�š üŃ##¯š <íƒ#ìè ùƒ#ú ü�„3#Þß ü¹„*#œà <è„#ïå ô„#ú üü„G# D let service: BoxCloneService<Request, Response, BoxError> = serviceÁ äÈ…#š� üé…)#À� |—†#ò� T«†#Šž 캆#�ž ü܆*#Äž |‹‡#÷ž TŸ‡#Šž ¼®‡# .boxed_clone();Á ʇ#ú üÒ‡-# * // The boxed service can still be cloned.Á ¤„ˆ# service.clone();Á ü�ˆ,#ÿ¢ üΈ*#´¤ üýˆ!#è¤ <£‰#Ê ¯‰#ú ü·‰ #±� ÔÛ‰# [`boxed`]: Self::boxedÁ\ý‰# °³ ý ý þ�: ‚ˆ ñ ªûuÈ"]qLÙË«ß
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Îì™Ê Ý‹# °ý<è‹# ”Ï ü”Œ #™Ê " ü¿‘?# ü¸Œ0# - Convert an `Option<Layer>` into a [`Layer`].Á éŒ#ú <íŒ#Ê 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‘#ìè <�‘#Ê ˜‘#ú üœ‘"# [`Layer`]: crate::layer::LayerÁdÆ‘# ۼݼ޼© ß¼ à¼ÛἈ cSñŸ«‡zÙîŽ ÷ ú û‚� üˆ ý þ›� ÿˆ ‡‰ÉÊŽ¬Þß� � ÷
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€ ìÕ ûŽ‚ Ô¢ üù $ ! Create a new [`ServiceBuilder`].Á ¯ ûŽ � �
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‚ Ì� � „ „ ‹ù ” ¿Ž… ‡ ‰ ‹ � 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“ Ù�,º ¿ŽÑÉ Ö Ö –µ Øç" ø
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… îŽÑÉ$à ç",É " üÉ&ƒ üÔ!? < Optionally add a new layer `T` into the [`ServiceBuilder`].Á ˜"ú < "Ê ô¬"áð ÌÏ"‰ñ üí")ñ ü›#'Žò üÇ#mÀò ü¹$/¸ó üí$$ ! // Apply a timeout if configuredÁ Ì–%†õ ü´%5 2 .option_layer(timeout.map(TimeoutLayer::new))Á ¬î% .service(svc)Á <ˆ& # ;Á <”&ìè < &Ê »ã(„²&Ĭ&dÐ& ¿ŽÛ¼Ý¼Þ¼© ß¼ à¼ÛἈ cSñŸ«‡zÙÑÉ Ö Ö –µ Øç" ø
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‡ îŽÑÉ$é&ç",÷& " üï)T ü�(] Z Add a [`Layer`] built from a function that accepts a service and returns another service.Á ñ(ú üù(< 9 See the documentation for [`layer_fn`] for more details.Á º)ú üÂ)( % [`layer_fn`]: crate::layer::layer_fnÁDö) ¿ŽÕÖ Ö Ö –µ Øç" ø
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Æ‘�©‘Rh$ò$ò ¬ù $õÆ4$ $öÈÿ $ PÛÈù—$ê$ê Ü× $ì±$ äƒ5ظ�³ÕÖîŽ ƒ — Š Š ƒ ¸Ó ÿ)
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‰ îŽÕÖ$‚*± ˆ* " ü÷@Y üÐ=H E Retry failed requests according to the given [retry policy][policy].Á �>ú ü¥>F C `policy` determines which failed requests will be retried. It mustÁ üð>2 / implement the [`retry::Policy`][policy] trait.Á §?ú ü¯?B ? This wraps the inner service with an instance of the [`Retry`]Á |ö?ñï Š@ú Ü’@ [`Retry`]: crate::retryÁ ü²@" [policy]: crate::retry::PolicyÁ »ª Œß@ÌÙ@,þ@ ¿ŽêÔ Ö Ö –µ Øç" ø
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‹ îŽêÔ$‡A¸#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 |°Dñï ÄDú üÌD [`timeout`]: crate::timeoutÁ »Õ%œöDÜðD<—E ¿Žš£ Ö Ö –µ Øç" ø
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� îŽ$¨EÕ%<¶Eüç^« üæO$ ! Map one request type to another.Á �Pú ü—PG D This wraps the inner service with an instance of the [`MapRequest`]Á |ãPñï ÷Pú tÿP·Ä ’Qú üšQ# Changing the type of a request:Á ÂQú \ÊQÚÄ ôÚQ use tower::ServiceBuilder;Á ÔýQ use tower::ServiceExt;Á œRú ¤¤RÂù 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 <ÀTïå 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¶Xˆþ <ÇXìè <ÓXÊ ßXú üçX Modifying the request value:Á ŒYú \”YÚÄ ô¤YŠ— ÔÇY±— æYú ¤îYÂù ü‡Z)î— 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[ïå 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 ´÷\Ðõ ’]ú üš]) & let response = svc.oneshot(1).await?;Á äÈ] assert_eq!(response, 2);Á dé]ˆþ <ú]ìè <†^Ê ’^ú üš^+ ( [`MapRequest`]: crate::util::MapRequestÁ »ã(„Ð^ÄÊ^\î^ ¿ŽÕÖ Ö Ö –µ Øç" ø
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Æ‘�©‘Rh$ò$ò ¬ù $õÆ4$ $öÈÿ $ PÛÈù—ø÷îŽ ƒ — � L � ªL ‘ ‘ � � ƒ ¸Ó ú^ Òëý^ ãë�_ ‡ì|ú_ ¯ë‡` Çå,Œ`
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Ž îŽÕÖ¦÷Àë$Ž_± œ_PR UW Z\ üécw üÝ`% " Map one response type to another.Á ‡aú ü�aH E This wraps the inner service with an instance of the [`MapResponse`]Á |Üañï ðaú üøaJ G See the documentation for the [`map_response` combinator] for details.Á Çbú üÏb- * [`MapResponse`]: crate::util::MapResponseÁ ü�cF C [`map_response` combinator]: crate::util::ServiceExt::map_responseÁ »ã(„ÒcÄÌcdðc ¿ŽÕÖ Ö Ö –µ Øç" ø
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Æ‘�©‘Rh$ò$ò ¬ù $õÆ4$ $öÈÿ $ PÛÈù—ýúîŽ ƒ — “ “ ƒ ¸Ó ýc
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’ îŽÕÖ$‰d± —d " ü“hV ü¨e" Map one error type to another.Á Ïeú ü×eC @ This wraps the inner service with an instance of the [`MapErr`]Á |Ÿfñï ³fú ü»fE B See the documentation for the [`map_err` combinator] for details.Á …gú ü�g# [`MapErr`]: crate::util::MapErrÁ üµg< 9 [`map_err` combinator]: crate::util::ServiceExt::map_errÁ »ã(„ügÄög<šh ¿ŽÕÖ Ö Ö –µ Øç" ø
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Æ‘�©‘Rh$ò$ò ¬ù $õÆ4$ $öÈÿ $ PÛÈù—�öîŽ ƒ — • • ƒ ¸Ó ¢h
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” îŽÕÖ$¥h± «h " üËl\ ü¬iHËÊ ùiú ü�jW T This wraps the inner service with an instance of the [`MapFutureLayer`] middleware.Á Ýjú üåjH E See the documentation for the [`map_future`] combinator for details.Á ²kú üºk3 0 [`MapFutureLayer`]: crate::util::MapFutureLayerÁ üòk7 4 [`map_future`]: crate::util::ServiceExt::map_futureÁ »ã(„´lÄ®lTÒl ¿ŽÕÖ Ö Ö –µ Øç" ø
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Æ‘�©‘Rh$ò$ò ¬ù $õÆ4$ $öÈÿ $ PÛÈù—ž€îŽ ƒ — — — ƒ ¸Ó Ýl
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– îŽÕÖ$àl± æl " üÊtQ üímV S Apply an asynchronous function after the service, regardless of whether the futureÁ ´Èn succeeds or fails.Á ãnú üënA > This wraps the inner service with an instance of the [`Then`]Á |±oñï Åoú üÍoF C This is similar to the [`map_response`] and [`map_err`] functions,Á ü˜pH¡ï
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üåpHóï
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ž îŽ$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 ܹ„Ù� üÙ„ ±�<„… … …¿Ž ŒÊîŽŒÊ $Ü ƒ ¤ �… ƒ çò Œ… $ÚîŽŒÊ DÅ…
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Ÿ Ê$�…Ñg<–…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 \«ˆÚÄ ü»ˆ. + # use tower::{ServiceBuilder, service_fn};Á üîˆ= : # async fn handler_fn(_: ()) -> Result<(), ()> { Ok(()) }Á |°‰ # let _ = {Á Ìĉ†õ t≾¿ üõ‰( % .service(service_fn(handler_fn))Á D¢ŠÛè <¯ŠÃŠ »Šú lÊŽâ ÕŠú \ÝŠÚÄ äíŠñö üŽ‹B ? use tower::{ServiceBuilder, ServiceExt, BoxError, service_fn};Á Õ‹ú ¤Ý‹Âù üö‹/àù üªŒN K async fn handle(request: &'static str) -> Result<&'static str, BoxError> {Á ”ýŒî ,”�¯Ç ž�ú ü¦�#£¡ ¬Î� .buffer(1024)Á üè�)០䖎 .service_fn(handle);Á ·Žú ü¿Ž- * let response = svc.oneshot("foo").await?;Á ñŽú üùŽ assert_eq!(response, "foo");Á dž�ˆþ <¯�ìè <»�Ê Ç�ú ÜÏ�Ù� üï� ±� ü“�% " [`service_fn`]: crate::service_fnÁ »ã(„Ã�Ľ�Tá� ¿ŽÕÖîŽ ñ ñ ã® ó± À O»_‹ƒ ¼ÍÕÖ $Ü ƒ — ¢ ¢ ƒ ¸Ó ì� $ÚîŽàÖ üž‘
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¡ îŽÕÖ$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“Žâ ‡”ú \�”ÚÄ ôŸ”Š— ”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–Šž 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 \®˜Þ¢ <¾˜ÃŠ\ߘ ¿Ž¿Ž ƒ ƒ Ø¿Ž ,‘™
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£ îŽ$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[Ø× ’›ú üš›CËØ â›ú lꛎâ ü›ú \„œÚÄ ô”œŠ— ·œú ´¿œ # #[derive(Clone)]Á ¼Úœ # struct MyService;Á ,öœÅ™ ü€�'êÙ ü¬�5œÚ üæ�(ÜÚ ü“ž%�Û œ½ž¾Û TÕžŠž üäžO L // Ensure that the service produced when given a `MyService` implementsÁ ü¸Ÿ+ ( .check_service_clone::<MyService>()Á üèŸ4ÉÜ ü¡ *ˆÝ üÐ &½Ý ¤û íÝ \”¡Þ¢ <¤¡ÃŠœÅ¡ ¿Ž¿Ž ƒ ¤ ¥ ¥ ƒ çò Ù¡ ÝË Dÿ¡ Ø Ë ,�¢
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¦ Êåô ùô ·¦ $¶°£¥ œž •— ™› ü¶¹£ üº±X U This wraps the inner service with the [`Layer`] returned by [`BoxService::layer()`].Á —²ú üŸ²% " See that method for more details.Á ɲú lѲŽâ ã²ú <ë²ÃŠ ü÷²E B use tower::{Service, ServiceBuilder, BoxError, util::BoxService};Á äÁ³ñö ,â³Å™ ¬ì³Ó™ ´†´ñ™ ¬¡´�š ü»´#¯š <ã´ìè ï´ú ü÷´P M let service: BoxService<Request, Response, BoxError> = ServiceBuilder::new()Á „̵
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« ʺó$Ò¹ŠŒ Ž� ü–ɶ ü ¾] Z This wraps the inner service with the [`Layer`] returned by [`BoxCloneService::layer()`].Á ‚¿ú üŠ¿R€æ üá¿CÝæ ©Àú ü±À-«ç ãÀú lëÀŽâ ýÀú <…ÁÊ ü‘ÁJéš äàÁñö ,�ÂÅ™ ¬‹ÂÓ™ ´¥Âñ™ ¬ÀÂ�š üÚÂ#¯š <‚Ãìè ŽÃú ü–ÃU R let service: BoxCloneService<Request, Response, BoxError> = ServiceBuilder::new()Á ´ðà .boxed_clone()Á ¤‹ÄœŸ ô¤Ä¹Ÿ üÇÄ)០üõÄ*” ü¤Å.§¢ \×ÅÞ¢ üçÅ,ÿ¢ ˜Æú ü Æ-ƒì ¤Òƺì üëÆ*´¤ üšÇ!è¤ <ÀÇÊ ÌÇú üÔÇG D [`BoxCloneService::layer()`]: crate::util::BoxCloneService::layer()Á ü È5 2 [`BoxCloneService`]: crate::util::BoxCloneServiceÁ ÔÚÈ¯í »ã(„ÿÈÄùÈ\�É ¿Ž Ö Ö –µ Øç" ø
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® ʺó$¸Éfh jl ü·Ù† ü˜Î] Z This wraps the inner service with the [`Layer`] returned by [`BoxCloneSyncServiceLayer`].Á úÎú ü‚ÏX U This is similar to the [`boxed_clone`] method, but it requires that `Self` implementÁ üßÏA > [`Sync`], and the returned boxed service implements [`Sync`].Á ¥Ðú üÐ1 . See [`BoxCloneSyncService`] for more details.Á ãÐú lëÐŽâ ýÐú <…ÑÊ ü‘ÑN K use tower::{Service, ServiceBuilder, BoxError, util::BoxCloneSyncService};Á ääÑñö ,…ÒÅ™ ¬�ÒÓ™ ´©Òñ™ ¬ÄÒ�š üÞÒ#¯š <†Óìè ’Óú üšÓY V let service: BoxCloneSyncService<Request, Response, BoxError> = ServiceBuilder::new()Á ¤øÓœŸ ô‘Ô¹Ÿ ü´Ô)០ÜâÔ .boxed_clone_sync()Á ü‚Õ*” ü±Õ.§¢ \äÕÞ¢ üôÕ,ÿ¢ ¥Öú üÖ-ƒì ¤ßÖºì üøÖ*´¤ ü§×!è¤ <Í×Ê Ù×ú üá×G D [`BoxCloneSyncServiceLayer`]: crate::util::BoxCloneSyncServiceLayerÁ üØ= : [`BoxCloneSyncService`]: crate::util::BoxCloneSyncServiceÁ üïØ&�ã »ã(„ ÙÄšÙ„¾Ù ¿Ž Ö Ö –µ Øç" ø
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» ÛÈ �$€áÆ4,†álî> ü 2/ / A collection of [`Layer`] based tower servicesÁ 3/ú Ü7/Ù� ,ö> Á ™fDj/ $ ¾ £Õ,t/ $Ú ¿ Ü×<{/ $ê À \\/46')d¡/ ü†"/ Utilities for combining layersÁ ©/ú ü./ + [`Identity`]: crate::layer::util::IdentityÁ ÜÜ/Ù� üø(/ % [`Stack`]: crate::layer::util::StackÁ $©/ ´ŽDÊ/ $ä à ¬ù ,Ô/ $ò Ä \¼/&(TÞ? UªUªkªkªôœ@ ~ªÄ�A �ª”ÏA ªª´ûA ¼ªT÷B »èœ¸B »¡¤ÍB »»„ãB ü·B= ü®BH 4ûB Í œˆC 4’C Í ¥ Î Í Î ¨³´ˆC õÈ ™C Í ¨³ ¨³& !# ŒÊC ü¢C' $ Alias for a type-erased error type.ÁDÓC ò¶¤� ü[I F A [`MakeService`] that produces services by cloning an inner service.Á ¥ú ü©' $ [`MakeService`]: super::MakeServiceÁ Ñú lÕŽâ ãú <çÊ 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 ¼ÂÜâ 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 ¬ÄËè Úú üÞ)øè 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…éÏ �ú ü“: 7 fn call(&mut self, req: Request) -> Self::Future {Á üÎ" ready(Ok(Response {}))Á LñéÏ ,û¯Ç � 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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ùù•º´ ü×]+Iù�º Z This is a [`Stream`] of responses resulting from calling the wrapped [`Service`] for eachÁ ü¹/+n , request received on the wrapped [`Stream`].Á í+§ú \õ+´ÚÄ ü…%+ÃñÄ
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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+<Å™ 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 +ý¯ ,× +¯Ç 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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ž ž ˆm ¢Æ4 þ Ó\ ‡l,¦Å êlÕÖ«ß Ó\ ‡l,¦Å ¢1çÓÝ àã Þá ‰ þ ž ž „¾„¾ ÎË †¾‰ ˜X $ ]È=„kt• êl¾Å ù镇› 1éù… 9âÜ} ¤„¾„¾ ÎË †¾‰ ˜X $ ]È=„kt• ¤«õ ™ ™ Øl �Æ4 þ ^9ij§Ç½- ¤íÕÞõ “ 1é°‡ “
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¹ï×ê ™Ê ùï‘ëF ³ — µ Ÿ ¶ µ ¶ Ö¶ Ž¶«õ " Üè üc6 3 Service returned by the [`MapRequest`] combinator.Á šú üž8 5 [`MapRequest`]: crate::util::ServiceExt::map_requestÁ 7Tó ¤ ¸ — ¹ ¹ ¸ é½ þ ¸Ó �Îö Ñð*«;Æg7 º»(* -/ DŠ,Š£ · · ÛÈ$˜ ˜£ · · ÕÖ(òà » ¤ ½ — ¾ ½ ¾ é½± ¸Ó¯ †Éòþ Çåò�Îö¿ Ù ¿ ÜÞ áã |~ ç çÎö Îö ¼ òà ¼
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¿ÛÈÕÖÔìÚ üå 6 3 A [`Layer`] that produces [`MapRequest`] services.Á œ ú ü !ùá 9|å — Á Á Ö¶ õ ³÷ Ò©©ÃÖ‹q¾  $þ þ £ À À íÕ(ôË ¼ — Ä Ä Ö¶o ü‚ôõ ³÷Å Ù Å ŠŒ PR è è³÷ ³÷ à ôË Ã
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ÈíÕý±äž ü”8 5 Service returned by the [`map_response`] combinator.Á Íú üÑ; 8 [`map_response`]: crate::util::ServiceExt::map_responseÁ :\© ¤ Ê — Ë Ê Ë é½ µ ¸Ó ¸¶ø =‚Ùû±2¾B ÌÍ(* -/ DÁ,ÁÅ É É ÛÈ$Ï ÏÅ É É ÕÖ(ö– ¾ ¤ Ï — Ð Ð Ï é½± ¸Ó¯ †Éöµ Çåö¸¶øÑ Ù Ñ ÜÞ áã |~ ì ì¶ø ¶ø Î ö– Î
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ÑÛÈÕÖÔôŒ ü•8 5 A [`Layer`] that produces a [`MapResponse`] service.Á Îú üÒ!ùá <„— — Ó Ó Ö¶ ¨‹ù ½%bTðB Ô $± ±Å Ò Ò íÕ(øý ¿ — Ö Ö Ö¶o ²Šø¨‹ù× Àc × ŠŒ PR í î ï í‹ù î c c ˆ ¢cµ
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ÚíÕ¦øúž$ = — Ü Ÿ Ý Ü Ý Ö¶ Û Ž¶ ÞšúÞ øúÑ) úß &Ô,&Ô, ¼ô &×,Æ4&³ +º†ŸíÕÞõšú Û Û
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ÞíÕÞõÆ4(úã øúá8 = — à Ÿ á à á Ö¶ç Ž¶åšúâ Àc â þ øú¨B ú« ñ ò ó ñšú ò c c ˆ ¢cµ
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çíÕÞõ úÑ Ý©úñ ù‚•º´ üÏ2I‚�º / Response future from [`MapResponse`] services.Á †Bú üŽ-P’© ÊŒÉ — é Ÿ ê é ê Ö¶¦ Ž¶¥šú mkÌ—¶Ô$
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ó ó Øl ÷Æ4 Å Ïé0iD0WC êlÕÖ«ß Ïé0iD0WC ÷1…ÓÝ =@ DG ‰mÅ ó ó „¾„¾ ÎË †¾‰ ˜X $ ]È=„kt• êl&Ô,&Ô, ¼ô &×,Æ4&³ +º†ŸÕÖ«ßùˆ¨ÝÕ 1ˆ¨Õ Øiƒ®x êl ù — ú Ÿ û ù ú û ¸ÓO žÖN Ëò1ˆ¤Þ Ï�ù‡ÿÈ êÃ
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¹�×ê ™Ê ù�‘ëF Õ — � Ÿ � � � Ö¶ Ž¶šú Ô“ ü�6 3 Service returned by the [`map_result`] combinator.Á Æú üÊ7 4 [`map_result`]: crate::util::ServiceExt::map_resultÁ >Lž ¤ ’ — “ ’ “ é½ ¨ ¸Ó «»û ]#�}VP” ”•(* -/ D´,´ê ‘ ‘ ÛÈ$ Âê ‘ ‘ ÕÖ(“‹ Ý ¤ — — ˜ — ˜ é½± ¸Ó¯ †É“¨ Çå“«»û™ Ù ™ ÜÞ áã |~ ø ø»û »û – “‹ –
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™ÛÈÕÖÔäù ü„6 3 A [`Layer`] that produces a [`MapResult`] service.Á »ú ü¿!ùá @t„ — › › Ö¶ “�ü 3¡x�Q™; œ $œ œê š š íÕ(•ê Þ — ž ž Ö¶o ²Š•“�üŸ Àc Ÿ ŠŒ PR
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¯íÕÞõ —Ñ Ý©—ñ ùŸ•º´ üº0IŸ�º - Response future from [`MapResult`] services.Á ï@ú ü÷)NÿÄ é|® — ± Ÿ ² ± ² Ö¶¢ Ž¶¡Ÿý D†'Ñ¡
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s ³ÆÉ ÍР៓» (—î ê ° ° Í‹Y ös üs ê ù ¸{2 í — ¶ Ÿ · ¶ · Ö¶V Ž¶UŸýÅÇ jm qt ù Ú•S Á Ý• ê ƒ ƒŸý — ¹ Ÿ º º ¹ ’– Ö¶ü Ž¶û
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» » Øl ¿Æ4 ê ØRd˜ÇÐú‡ êlÕÖ«ß ØRd˜ÇÐú‡ ¿1¢ÓÝ 9< @C ‰mê » » „¾„¾ ÎË †¾‰ ˜X $ ]È=„kt• êl&�$&�$ •‡ &�$Æ4& 4?�®#–ÕÖ«ßù¥¨ÝÕ 1¥¨Õ ÷i ®x êl Á —  Ÿ à Á  à ¸ÓJ žÖI ²˜1¥¤Þ Ï�ù¤ÿÈ êÃ
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Ÿý Ôƒ ü{: 7 [`Service`] returned by the [`map_future`] combinator.Á ¶ú üº7�³ BLŽ ¤ Ú — Û Û Ú é½ ˜ ¸Ó ›Àþ ÆXç�Ç ÜÝ(* -/ D¤,¤� Ù Ù ÛÈ$² ²� Ù Ù ÕÖ(°û ü ¤ ß — à à ß é½± ¸Ó¯ †É°˜ Çå°›Àþá Ù á ÜÞ áã |~ „ „Àþ Àþ Þ °û Þ
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áÛÈÕÖÔäâ üô6 3 A [`Layer`] that produces a [`MapFuture`] service.Á «ú ü¯!ùá Dtí — ã ã Ö¶ üäÿ �ô´æiåpU ä $… …� â â íÕ(²Ú ý — æ æ Ö¶o ü‚²üäÿç Ù ç ŠŒ PR … …äÿ äÿ å ²Ú å
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çíÕ£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 Ù# ê é ê é½ ž ô‰ ¯ ç· yºŸ£ ç€ K¿RPø„h ë24 79 ἓ» ,ͼ è è €ƒ(½ÿ ‹ ¤ í Ù# î í î é½£ ô‰¡ ÉÓ½ž ç· © Žº ½¯ç€ï Àc ï ÔÖ ÙÛ ‚„ † ‡ ˆ †ç€ ‡ c c ˆ ¢cµ
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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 <âÊ 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 Ìø‰ñ ü’ )ñ ü¼ 8 5 # #[cfg(all(feature = "buffer", feature = "limit"))]Á üõ mÀò Ìã
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R O layer. Combined with `concurrency_limit`, this allows up to 110 requests to beÁ t in-flight.Á ¯ú <³ÃŠ Ì»‰ñ üÕ)ñ üÿ8ª³ ü¸mÀò ̦†õ ôÀ£´ ¤ß†´ ¬ôý‚ <Š›ƒ <’ìè <šÃŠ ¢ú ü¦K H The above example is similar, but the order of layers is reversed. Now,Á üòQ N `concurrency_limit` applies first and only allows 10 requests to be in-flightÁ TÄ total.Á Ïú tÓ·Ä âú üæ, ) A [`Service`] stack with a single layer:Á “ú <—Ê ÌŸ‰ñ ü¹)ñ üã # #[cfg(feature = "limit")]Á üƒ; 8 # use tower::limit::concurrency::ConcurrencyLimitLayer;Á ü¿ Œ¼ üßmÀò Ì͆õ ìç .concurrency_limit(5)Á ´…Ðõ <œ›ƒ <¤ìè <¬ÃŠ ´ú ü¸J G A [`Service`] stack with _multiple_ layers that contain rate limiting,Á üƒI F in-flight request limits, and a channel-backed, clonable [`Service`]:Á Íú <ÑÊ ÌÙ‰ñ üó)ñ ô�áð ü¼8ª³ üõmÀò Ìã†õ ”ý .buffer(5)Á ì�¢½ ü®. + .rate_limit(5, Duration::from_secs(1))Á ´ÝÐõ <ô›ƒ <üìè <„Ê Œú ü� ±� YtÌ � × × ‹ù Û¿Ž Æ‘�©‘Rh Ø Dä,äø
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