projects / OpenSPARC-T2-SAM / blame
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| 53 | ||
| 54 | <H2><A NAME="SECTION00132620000000000000000"></A><A NAME="asynchat-example"></A> | |
| 55 | <BR> | |
| 56 | 11.26.2 asynchat Example | |
| 57 | </H2> | |
| 58 | ||
| 59 | <P> | |
| 60 | The following partial example shows how HTTP requests can be read with | |
| 61 | <tt class="class">async_chat</tt>. A web server might create an <tt class="class">http_request_handler</tt> object for | |
| 62 | each incoming client connection. Notice that initially the | |
| 63 | channel terminator is set to match the blank line at the end of the HTTP | |
| 64 | headers, and a flag indicates that the headers are being read. | |
| 65 | ||
| 66 | <P> | |
| 67 | Once the headers have been read, if the request is of type POST | |
| 68 | (indicating that further data are present in the input stream) then the | |
| 69 | <code>Content-Length:</code> header is used to set a numeric terminator to | |
| 70 | read the right amount of data from the channel. | |
| 71 | ||
| 72 | <P> | |
| 73 | The <tt class="method">handle_request()</tt> method is called once all relevant input | |
| 74 | has been marshalled, after setting the channel terminator to <code>None</code> | |
| 75 | to ensure that any extraneous data sent by the web client are ignored. | |
| 76 | ||
| 77 | <P> | |
| 78 | <div class="verbatim"><pre> | |
| 79 | class http_request_handler(asynchat.async_chat): | |
| 80 | ||
| 81 | def __init__(self, conn, addr, sessions, log): | |
| 82 | asynchat.async_chat.__init__(self, conn=conn) | |
| 83 | self.addr = addr | |
| 84 | self.sessions = sessions | |
| 85 | self.ibuffer = [] | |
| 86 | self.obuffer = "" | |
| 87 | self.set_terminator("\r\n\r\n") | |
| 88 | self.reading_headers = True | |
| 89 | self.handling = False | |
| 90 | self.cgi_data = None | |
| 91 | self.log = log | |
| 92 | ||
| 93 | def collect_incoming_data(self, data): | |
| 94 | """Buffer the data""" | |
| 95 | self.ibuffer.append(data) | |
| 96 | ||
| 97 | def found_terminator(self): | |
| 98 | if self.reading_headers: | |
| 99 | self.reading_headers = False | |
| 100 | self.parse_headers("".join(self.ibuffer)) | |
| 101 | self.ibuffer = [] | |
| 102 | if self.op.upper() == "POST": | |
| 103 | clen = self.headers.getheader("content-length") | |
| 104 | self.set_terminator(int(clen)) | |
| 105 | else: | |
| 106 | self.handling = True | |
| 107 | self.set_terminator(None) | |
| 108 | self.handle_request() | |
| 109 | elif not self.handling: | |
| 110 | self.set_terminator(None) # browsers sometimes over-send | |
| 111 | self.cgi_data = parse(self.headers, "".join(self.ibuffer)) | |
| 112 | self.handling = True | |
| 113 | self.ibuffer = [] | |
| 114 | self.handle_request() | |
| 115 | </pre></div> | |
| 116 | ||
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| 153 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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