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annotate roundup/cgi/engine_zopetal.py @ 4651:beb8d43f4d9d

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issue2550765: Don't show links in calendar that will fail. Found and fixed by Cédric Krier.
author Bernhard Reiter <bernhard@intevation.de>
date Wed, 01 Aug 2012 08:49:41 +0200
parents a2eb4fb3e6d8
children 05fe39f1d823
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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, find_template, TemplatesBase
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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 class Templates(TemplatesBase):
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19 templates = {}
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20
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21 def __init__(self, dir):
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22 self.dir = dir
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23
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24 def get(self, name, extension=None):
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25 """ Interface to get a template, possibly loading a compiled template.
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26
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27 "name" and "extension" indicate the template we're after, which in
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28 most cases will be "name.extension". If "extension" is None, then
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29 we look for a template just called "name" with no extension.
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30
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31 If the file "name.extension" doesn't exist, we look for
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32 "_generic.extension" as a fallback.
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33 """
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34 # default the name to "home"
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35 if name is None:
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36 name = 'home'
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37 elif extension is None and '.' in name:
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38 # split name
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39 name, extension = name.split('.')
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40
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41 # find the source
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42 src, filename = find_template(self.dir, name, extension)
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43
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44 # has it changed?
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45 try:
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46 stime = os.stat(src)[os.path.stat.ST_MTIME]
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47 except os.error, error:
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48 if error.errno != errno.ENOENT:
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49 raise
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50
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51 if self.templates.has_key(src) and \
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52 stime <= self.templates[src].mtime:
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53 # compiled template is up to date
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54 return self.templates[src]
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55
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56 # compile the template
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57 pt = RoundupPageTemplate()
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58 # use pt_edit so we can pass the content_type guess too
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59 content_type = mimetypes.guess_type(filename)[0] or 'text/html'
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60 pt.pt_edit(open(src).read(), content_type)
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61 pt.id = filename
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62 pt.mtime = stime
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63 # Add it to the cache. We cannot do this until the template
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64 # is fully initialized, as we could otherwise have a race
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65 # condition when running with multiple threads:
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66 #
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67 # 1. Thread A notices the template is not in the cache,
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68 # adds it, but has not yet set "mtime".
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69 #
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70 # 2. Thread B notices the template is in the cache, checks
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71 # "mtime" (above) and crashes.
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72 #
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73 # Since Python dictionary access is atomic, as long as we
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74 # insert "pt" only after it is fully initialized, we avoid
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75 # this race condition. It's possible that two separate
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76 # threads will both do the work of initializing the template,
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77 # but the risk of wasted work is offset by avoiding a lock.
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78 self.templates[src] = pt
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79 return pt
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80
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81 class RoundupPageTemplate(PageTemplate.PageTemplate):
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82 """A Roundup-specific PageTemplate.
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83
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84 Interrogate the client to set up Roundup-specific template variables
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85 to be available. See 'context' function for the list of variables.
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86
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87 """
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88
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89 def render(self, client, classname, request, **options):
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90 """Render this Page Template"""
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91
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92 if not self._v_cooked:
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93 self._cook()
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94
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95 __traceback_supplement__ = (PageTemplate.PageTemplateTracebackSupplement, self)
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96
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97 if self._v_errors:
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98 raise PageTemplate.PTRuntimeError, \
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99 'Page Template %s has errors.'%self.id
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100
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101 # figure the context
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102 c = context(client, self, classname, request)
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103 c.update({'options': options})
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104
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105 # and go
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106 output = StringIO.StringIO()
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107 TALInterpreter.TALInterpreter(self._v_program, self.macros,
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108 getEngine().getContext(c), output, tal=1, strictinsert=0)()
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109 return output.getvalue()
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110
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