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1 | 1 | # hgweb/wsgicgi.py - CGI->WSGI translator |
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2 | 2 | # |
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3 | 3 | # Copyright 2006 Eric Hopper <hopper@omnifarious.org> |
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4 | 4 | # |
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5 | 5 | # This software may be used and distributed according to the terms |
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6 | 6 | # of the GNU General Public License, incorporated herein by reference. |
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7 | 7 | # |
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8 | 8 | # This was originally copied from the public domain code at |
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9 | 9 | # http://www.python.org/dev/peps/pep-0333/#the-server-gateway-side |
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10 | 10 | |
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11 | 11 | import os, sys |
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12 | from mercurial import util | |
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12 | 13 | |
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13 | 14 | def launch(application): |
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15 | util.set_binary(sys.stdout) | |
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14 | 16 | |
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15 | 17 | environ = dict(os.environ.items()) |
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16 | 18 | environ['wsgi.input'] = sys.stdin |
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17 | 19 | environ['wsgi.errors'] = sys.stderr |
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18 | 20 | environ['wsgi.version'] = (1, 0) |
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19 | 21 | environ['wsgi.multithread'] = False |
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20 | 22 | environ['wsgi.multiprocess'] = True |
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21 | 23 | environ['wsgi.run_once'] = True |
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22 | 24 | |
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23 | 25 | if environ.get('HTTPS','off') in ('on','1'): |
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24 | 26 | environ['wsgi.url_scheme'] = 'https' |
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25 | 27 | else: |
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26 | 28 | environ['wsgi.url_scheme'] = 'http' |
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27 | 29 | |
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28 | 30 | headers_set = [] |
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29 | 31 | headers_sent = [] |
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30 | 32 | out = sys.stdout |
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31 | 33 | |
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32 | 34 | def write(data): |
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33 | 35 | if not headers_set: |
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34 | 36 | raise AssertionError("write() before start_response()") |
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35 | 37 | |
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36 | 38 | elif not headers_sent: |
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37 | 39 | # Before the first output, send the stored headers |
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38 | 40 | status, response_headers = headers_sent[:] = headers_set |
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39 | 41 | out.write('Status: %s\r\n' % status) |
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40 | 42 | for header in response_headers: |
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41 | 43 | out.write('%s: %s\r\n' % header) |
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42 | 44 | out.write('\r\n') |
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43 | 45 | |
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44 | 46 | out.write(data) |
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45 | 47 | out.flush() |
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46 | 48 | |
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47 | 49 | def start_response(status, response_headers, exc_info=None): |
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48 | 50 | if exc_info: |
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49 | 51 | try: |
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50 | 52 | if headers_sent: |
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51 | 53 | # Re-raise original exception if headers sent |
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52 | 54 | raise exc_info[0], exc_info[1], exc_info[2] |
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53 | 55 | finally: |
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54 | 56 | exc_info = None # avoid dangling circular ref |
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55 | 57 | elif headers_set: |
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56 | 58 | raise AssertionError("Headers already set!") |
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57 | 59 | |
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58 | 60 | headers_set[:] = [status, response_headers] |
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59 | 61 | return write |
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60 | 62 | |
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61 | 63 | result = application(environ, start_response) |
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62 | 64 | try: |
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63 | 65 | for data in result: |
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64 | 66 | if data: # don't send headers until body appears |
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65 | 67 | write(data) |
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66 | 68 | if not headers_sent: |
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67 | 69 | write('') # send headers now if body was empty |
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68 | 70 | finally: |
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69 | 71 | if hasattr(result,'close'): |
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70 | 72 | result.close() |
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