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annotate roundup/cgi/engine_zopetal.py @ 5378:35ea9b1efc14

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Python 3 preparation: "raise" syntax. Changing "raise Exception, value" to "raise Exception(value)". Tool-assisted patch. Particular cases to check carefully are the one place in frontends/ZRoundup/ZRoundup.py where a string exception needed to be fixed, and the one in roundup/cgi/client.py involving raising an exception with a traceback (requires three-argument form of raise in Python 2, which as I understand it requires exec() to avoid a Python 3 syntax error).
author Joseph Myers <jsm@polyomino.org.uk>
date Tue, 24 Jul 2018 21:39:58 +0000
parents 198b6e810c67
children 0942fe89e82e
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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 class Loader(TALLoaderBase):
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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 load(self, tplname):
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25 # find the source
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26 src, filename = self._find(tplname)
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27
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28 # has it changed?
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29 try:
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30 stime = os.stat(src)[os.path.stat.ST_MTIME]
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31 except os.error as error:
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32 if error.errno != errno.ENOENT:
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33 raise
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34
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35 if self.templates.has_key(src) and \
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36 stime <= self.templates[src].mtime:
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37 # compiled template is up to date
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38 return self.templates[src]
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39
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40 # compile the template
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41 pt = RoundupPageTemplate()
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42 # use pt_edit so we can pass the content_type guess too
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43 content_type = mimetypes.guess_type(filename)[0] or 'text/html'
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44 pt.pt_edit(open(src).read(), content_type)
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45 pt.id = filename
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46 pt.mtime = stime
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47 # Add it to the cache. We cannot do this until the template
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48 # is fully initialized, as we could otherwise have a race
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49 # condition when running with multiple threads:
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50 #
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51 # 1. Thread A notices the template is not in the cache,
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52 # adds it, but has not yet set "mtime".
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53 #
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54 # 2. Thread B notices the template is in the cache, checks
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55 # "mtime" (above) and crashes.
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56 #
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57 # Since Python dictionary access is atomic, as long as we
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58 # insert "pt" only after it is fully initialized, we avoid
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59 # this race condition. It's possible that two separate
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60 # threads will both do the work of initializing the template,
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61 # but the risk of wasted work is offset by avoiding a lock.
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62 self.templates[src] = pt
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63 return pt
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64
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65 class RoundupPageTemplate(PageTemplate.PageTemplate):
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66 """A Roundup-specific PageTemplate.
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67
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68 Interrogate the client to set up Roundup-specific template variables
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69 to be available. See 'context' function for the list of variables.
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70
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71 """
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72
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73 def render(self, client, classname, request, **options):
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74 """Render this Page Template"""
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75
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76 if not self._v_cooked:
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77 self._cook()
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78
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79 __traceback_supplement__ = (PageTemplate.PageTemplateTracebackSupplement, self)
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80
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81 if self._v_errors:
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82 raise PageTemplate.PTRuntimeError('Page Template %s has errors.'%self.id)
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83
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84 # figure the context
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85 c = context(client, self, classname, request)
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86 c.update({'options': options})
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87
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88 # and go
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89 output = StringIO.StringIO()
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90 TALInterpreter.TALInterpreter(self._v_program, self.macros,
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91 getEngine().getContext(c), output, tal=1, strictinsert=0)()
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92 return output.getvalue()
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93
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