113 lines
3.6 KiB
Python
113 lines
3.6 KiB
Python
import errno
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import os
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import hashlib
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from django.core.files.base import File
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from django.core.exceptions import ObjectDoesNotExist
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from django.utils.translation import ugettext
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from documents.conf.settings import STAGING_DIRECTORY
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from documents.conf.settings import DEFAULT_TRANSFORMATIONS
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from documents.conf.settings import STAGING_FILES_PREVIEW_SIZE
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from converter import TRANFORMATION_CHOICES
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from converter.api import convert, cache_cleanup
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HASH_FUNCTION = lambda x: hashlib.sha256(x).hexdigest()
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#TODO: Do benchmarks
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#func = lambda:[StagingFile.get_all() is None for i in range(100)]
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#t1=time.time();func();t2=time.time();print '%s took %0.3f ms' % (func.func_name, (t2-t1)*1000.0)
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def get_all_files(path):
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try:
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return sorted([os.path.normcase(f) for f in os.listdir(path) if os.path.isfile(os.path.join(path, f))])
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except OSError, exc:
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raise OSError(ugettext(u'Unable get list of staging files: %s') % exc)
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def create_staging_file_class():
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return type('StagingFile', (StagingFile,), dict(StagingFile.__dict__))
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class StagingFile(object):
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"""
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Simple class to encapsulate the files in a directory and hide the
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specifics to the view
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"""
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path = STAGING_DIRECTORY
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@classmethod
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def set_path(cls, path):
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cls.path = path
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@classmethod
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def get_all(cls):
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staging_files = []
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for filename in get_all_files(cls.path):
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staging_files.append(StagingFile(
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filepath=os.path.join(cls.path, filename)))
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return staging_files
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@classmethod
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def get(cls, id):
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files_dict = dict([(file.id, file) for file in cls.get_all()])
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if id in files_dict:
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return files_dict[id]
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else:
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raise ObjectDoesNotExist
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def __init__(self, filepath):
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self.filepath = filepath
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self.filename = os.path.basename(filepath)
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self._id = HASH_FUNCTION(open(filepath).read())
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def __unicode__(self):
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return self.filename
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def __repr__(self):
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return self.__unicode__()
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def __getattr__(self, name):
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if name == 'id':
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return self._id
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else:
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raise AttributeError
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def upload(self):
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try:
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return File(file(self.filepath, 'rb'), name=self.filename)
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except Exception, exc:
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raise Exception(ugettext(u'Unable to upload staging file: %s') % exc)
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def delete(self):
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tranformation_string, errors = get_transformation_string(DEFAULT_TRANSFORMATIONS)
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cache_cleanup(self.filepath, size=STAGING_FILES_PREVIEW_SIZE, extra_options=tranformation_string)
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try:
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os.unlink(self.filepath)
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except OSError, exc:
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if exc.errno == errno.ENOENT:
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pass
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else:
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raise OSError(ugettext(u'Unable to delete staging file: %s') % exc)
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def preview(self):
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tranformation_string, errors = get_transformation_string(DEFAULT_TRANSFORMATIONS)
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output_file = convert(self.filepath, size=STAGING_FILES_PREVIEW_SIZE, extra_options=tranformation_string, cleanup_files=False)
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return output_file, errors
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def get_transformation_string(transformations):
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transformation_list = []
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errors = []
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for transformation in transformations:
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try:
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if transformation['name'] in TRANFORMATION_CHOICES:
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output = TRANFORMATION_CHOICES[transformation['name']] % eval(transformation['arguments'])
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transformation_list.append(output)
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except Exception, e:
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errors.append(e)
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tranformation_string = ' '.join(transformation_list)
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return tranformation_string, errors
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