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annotate roundup/cgi/engine_zopetal.py @ 8071:a4cb4e75d4e9

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final changes for 2.4.0 release
author John Rouillard <rouilj@ieee.org>
date Fri, 12 Jul 2024 20:32:20 -0400
parents 310e19beba3e
children dff6d2edc52f
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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, TALLoaderBase
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12 from roundup.cgi.PageTemplates import PageTemplate
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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
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17 class Loader(TALLoaderBase):
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18 templates = {}
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19
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20 def __init__(self, template_dir):
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21 self.template_dir = template_dir
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22
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23 def load(self, tplname):
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24 # find the source
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25 try:
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26 src, filename = self._find(tplname)
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27 except TypeError as e:
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28 raise ValueError("Unable to load template file basename: %s: %s" % (
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29 tplname, e))
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30
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31 # has it changed?
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32 try:
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33 stime = os.stat(src)[os.path.stat.ST_MTIME]
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34 except os.error as error:
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35 if error.errno != errno.ENOENT:
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36 raise
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37
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38 if src in self.templates and \
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39 stime <= self.templates[src].mtime:
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40 # compiled template is up to date
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41 return self.templates[src]
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42
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43 # compile the template
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44 pt = RoundupPageTemplate()
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45 # use pt_edit so we can pass the content_type guess too
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46 content_type = mimetypes.guess_type(filename)[0] or 'text/html'
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47 with open(src) as srcd:
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48 pt.pt_edit(srcd.read(), content_type)
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49 pt.id = filename
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50 pt.mtime = stime
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51 # Add it to the cache. We cannot do this until the template
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52 # is fully initialized, as we could otherwise have a race
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53 # condition when running with multiple threads:
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54 #
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55 # 1. Thread A notices the template is not in the cache,
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56 # adds it, but has not yet set "mtime".
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57 #
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58 # 2. Thread B notices the template is in the cache, checks
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59 # "mtime" (above) and crashes.
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60 #
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61 # Since Python dictionary access is atomic, as long as we
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62 # insert "pt" only after it is fully initialized, we avoid
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63 # this race condition. It's possible that two separate
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64 # threads will both do the work of initializing the template,
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65 # but the risk of wasted work is offset by avoiding a lock.
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66 self.templates[src] = pt
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67 return pt
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68
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70 class RoundupPageTemplate(PageTemplate.PageTemplate):
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71 """A Roundup-specific PageTemplate.
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72
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73 Interrogate the client to set up Roundup-specific template variables
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74 to be available. See 'context' function for the list of variables.
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75
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76 """
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77
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78 def render(self, client, classname, request, **options):
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79 """Render this Page Template"""
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80
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81 if not self._v_cooked:
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82 self._cook()
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83
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84 __traceback_supplement__ = (PageTemplate.PageTemplateTracebackSupplement, self)
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85
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86 if self._v_errors:
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87 raise PageTemplate.PTRuntimeError('Page Template %s has errors.' %
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88 self.id)
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89
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90 # figure the context
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91 c = context(client, self, classname, request)
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92 c.update({'options': options})
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93
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94 # and go
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95 output = StringIO()
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96 TALInterpreter.TALInterpreter(self._v_program, self.macros,
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97 getEngine().getContext(c), output,
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98 tal=1, strictinsert=0)()
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99 return output.getvalue()
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