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a i9,@sDdZddlZddlmZGdddejZGdddZdd ZdS) aA class supporting chat-style (command/response) protocols. This class adds support for 'chat' style protocols - where one side sends a 'command', and the other sends a response (examples would be the common internet protocols - smtp, nntp, ftp, etc..). The handle_read() method looks at the input stream for the current 'terminator' (usually '\r\n' for single-line responses, '\r\n.\r\n' for multi-line output), calling self.found_terminator() on its receipt. for example: Say you build an async nntp client using this class. At the start of the connection, you'll have self.terminator set to '\r\n', in order to process the single-line greeting. Just before issuing a 'LIST' command you'll set it to '\r\n.\r\n'. The output of the LIST command will be accumulated (using your own 'collect_incoming_data' method) up to the terminator, and then control will be returned to you - by calling your self.found_terminator() method. N)dequec@seZdZdZdZdZdZdZd(ddZdd Z d d Z d d Z ddZ ddZ ddZddZddZddZddZddZddZd d!Zd"d#Zd$d%Zd&d'ZdS)) async_chatzThis is an abstract class. You must derive from this class, and add the two methods collect_incoming_data() and found_terminator()irzlatin-1NcCs(d|_g|_t|_tj|||dSN) ac_in_bufferincomingr producer_fifoasyncore dispatcher__init__)selfsockmapr /usr/lib64/python3.9/asynchat.pyr Cszasync_chat.__init__cCs tddSNzmust be implemented in subclassNotImplementedErrorr datarrrcollect_incoming_dataQsz async_chat.collect_incoming_datacCs|j|dSN)rappendrrrr_collect_incoming_dataTsz!async_chat._collect_incoming_datacCsd|j}|jdd=|Sr)joinr)r drrr _get_dataWs  zasync_chat._get_datacCs tddSrrr rrrfound_terminator\szasync_chat.found_terminatorcCsBt|tr|jrt||j}nt|tr8|dkr8td||_dS)zdSet the input delimiter. Can be a fixed string of any length, an integer, or None. rz-the number of received bytes must be positiveN) isinstancestr use_encodingbytesencodingint ValueError terminator)r Ztermrrrset_terminator_s zasync_chat.set_terminatorcCs|jSr)r&rrrrget_terminatorjszasync_chat.get_terminatorcCsz||j}Wn.ty$YdSty>|YdS0t|tr\|jr\tt|j }|j ||_ |j rt |j }| }|s| |j d|_ qht|tr|}||kr| |j d|_ |j||_n2| |j d||j |d|_ d|_|qht |}|j |}|dkr`|dkrB| |j d||j ||d|_ |qht|j |}|r||kr| |j d| |j | d|_ qqh| |j d|_ qhdS)Nrr)recvac_in_buffer_sizeBlockingIOErrorOSError handle_errorrr r!r"r#rlenr(rr$r&rfindfind_prefix_at_end)r rZlbr&nZterminator_lenindexrrr handle_readrsR                zasync_chat.handle_readcCs |dSr) initiate_sendrrrr handle_writeszasync_chat.handle_writecCs |dSr)closerrrr handle_closeszasync_chat.handle_closecCsxt|tttfstdt||j}t||kr`tdt||D]}|j ||||q@n |j || dS)Nz#data argument must be byte-ish (%r)r) rr" bytearray memoryview TypeErrortypeac_out_buffer_sizer/rangerrr5)r rZsabsirrrpushs  zasync_chat.pushcCs|j||dSr)rrr5)r Zproducerrrrpush_with_producers zasync_chat.push_with_producercCsdS)z4predicate for inclusion in the readable for select()rrrrrreadableszasync_chat.readablecCs|jp |j S)z4predicate for inclusion in the writable for select())r connectedrrrrwritableszasync_chat.writablecCs|jddS)zAautomatically close this channel once the outgoing queue is emptyN)rrrrrrclose_when_doneszasync_chat.close_when_donecCs|jr|jr|jd}|s:|jd=|dur:|dS|j}z|d|}Wn8ty|}|rx|j|n|jd=YqYn0t|tr|j rt ||j }z| |}Wnt y|YdS0|r|t|ks|t|kr||d|jd<n|jd=dSdS)Nr)rrDr8r=r;more appendleftrr r!r"r#sendr-r.r/)r firstZobsrZnum_sentrrrr5s8     zasync_chat.initiate_sendcCs d|_|jdd=|jdSr)rrrclearrrrrdiscard_bufferss zasync_chat.discard_buffers)NN)__name__ __module__ __qualname____doc__r+r=r!r#r rrrrr'r(r4r6r8r@rArCrErFr5rLrrrrr4s,  H (rc@seZdZdddZddZdS)simple_producercCs||_||_dSr)r buffer_size)r rrSrrrr szsimple_producer.__init__cCsJt|j|jkr6|jd|j}|j|jd|_|S|j}d|_|SdSr)r/rrS)r resultrrrrGszsimple_producer.moreN)rR)rMrNrOr rGrrrrrQs rQcCs0t|d}|r,||d|s,|d8}q |S)NrB)r/endswith)ZhaystackZneedlelrrrr1/s  r1)rPr collectionsrr rrQr1rrrrs  \