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annotate roundup/cgi/engine_zopetal.py @ 5418:55f09ca366c4

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Python 3 preparation: StringIO. This generally arranges for StringIO and cStringIO references to use io.StringIO for Python 3 but io.BytesIO for Python 2, consistent with the string representations generally used in Roundup. A special FasterStringIO in the TAL code, which referenced internals of the old Python 2 StringIO module, is cut down so it doesn't actually do anything beyond the StringIO class it inherits from (it would also be reasonable to remove FasterStringIO completely). One place in roundup_server.py clearly needing binary I/O is made to use io.BytesIO unconditionally.
author Joseph Myers <jsm@polyomino.org.uk>
date Wed, 25 Jul 2018 09:08:29 +0000
parents 0942fe89e82e
children 38d04127d9bb
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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 src in self.templates 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()
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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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