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annotate roundup/cgi/engine_zopetal.py @ 6479:808f7a8ed2b6

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Clean leaking file descriptors. Eliminates ResourceWarnings.
author John Rouillard <rouilj@ieee.org>
date Sun, 05 Sep 2021 23:38:10 -0400
parents 38d04127d9bb
children 408fd477761f
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1 """Templating engine adapter for the legacy TAL implementation ported from
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2 Zope.
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3 """
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4 __docformat__ = 'restructuredtext'
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5
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6 import errno
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7 import mimetypes
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8 import os
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9 import os.path
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10
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11 from roundup.cgi.templating import StringIO, context, translationService, TALLoaderBase
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12 from roundup.cgi.PageTemplates import PageTemplate, GlobalTranslationService
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13 from roundup.cgi.PageTemplates.Expressions import getEngine
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14 from roundup.cgi.TAL import TALInterpreter
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15
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16 GlobalTranslationService.setGlobalTranslationService(translationService)
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17
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18
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19 class Loader(TALLoaderBase):
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20 templates = {}
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21
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22 def __init__(self, dir):
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23 self.dir = dir
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24
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25 def load(self, tplname):
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26 # find the source
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27 src, filename = self._find(tplname)
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28
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29 # has it changed?
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30 try:
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31 stime = os.stat(src)[os.path.stat.ST_MTIME]
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32 except os.error as error:
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33 if error.errno != errno.ENOENT:
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34 raise
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35
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36 if src in self.templates and \
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37 stime <= self.templates[src].mtime:
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38 # compiled template is up to date
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39 return self.templates[src]
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40
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41 # compile the template
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42 pt = RoundupPageTemplate()
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43 # use pt_edit so we can pass the content_type guess too
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44 content_type = mimetypes.guess_type(filename)[0] or 'text/html'
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45 with open(src) as srcd:
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46 pt.pt_edit(srcd.read(), content_type)
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47 pt.id = filename
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48 pt.mtime = stime
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49 # Add it to the cache. We cannot do this until the template
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50 # is fully initialized, as we could otherwise have a race
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51 # condition when running with multiple threads:
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52 #
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53 # 1. Thread A notices the template is not in the cache,
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54 # adds it, but has not yet set "mtime".
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55 #
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56 # 2. Thread B notices the template is in the cache, checks
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57 # "mtime" (above) and crashes.
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58 #
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59 # Since Python dictionary access is atomic, as long as we
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60 # insert "pt" only after it is fully initialized, we avoid
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61 # this race condition. It's possible that two separate
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62 # threads will both do the work of initializing the template,
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63 # but the risk of wasted work is offset by avoiding a lock.
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64 self.templates[src] = pt
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65 return pt
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66
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68 class RoundupPageTemplate(PageTemplate.PageTemplate):
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69 """A Roundup-specific PageTemplate.
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70
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71 Interrogate the client to set up Roundup-specific template variables
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72 to be available. See 'context' function for the list of variables.
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73
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74 """
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75
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76 def render(self, client, classname, request, **options):
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77 """Render this Page Template"""
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78
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79 if not self._v_cooked:
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80 self._cook()
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81
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82 __traceback_supplement__ = (PageTemplate.PageTemplateTracebackSupplement, self)
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83
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84 if self._v_errors:
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85 raise PageTemplate.PTRuntimeError('Page Template %s has errors.' %
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86 self.id)
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87
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88 # figure the context
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89 c = context(client, self, classname, request)
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90 c.update({'options': options})
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91
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92 # and go
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93 output = StringIO()
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94 TALInterpreter.TALInterpreter(self._v_program, self.macros,
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95 getEngine().getContext(c), output,
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96 tal=1, strictinsert=0)()
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97 return output.getvalue()
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