/usr/lib/python2.7/dist-packages/horizon/utils/csvbase.py is in python-django-horizon 1:2014.1.5-0ubuntu2.1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | # Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from __future__ import division
from csv import DictWriter # noqa
from csv import writer # noqa
from StringIO import StringIO
from django.http import HttpResponse # noqa
from django import template as django_template
from django import VERSION # noqa
class CsvDataMixin(object):
"""CSV data Mixin - provides handling for CSV data.
.. attribute:: columns
A list of CSV column definitions. If omitted - no column titles
will be shown in the result file. Optional.
"""
def __init__(self):
self.out = StringIO()
super(CsvDataMixin, self).__init__()
if hasattr(self, "columns"):
self.writer = DictWriter(self.out, map(self.encode, self.columns))
self.is_dict = True
else:
self.writer = writer(self.out)
self.is_dict = False
def write_csv_header(self):
if self.is_dict:
try:
self.writer.writeheader()
except AttributeError:
# For Python<2.7
self.writer.writerow(dict(zip(
self.writer.fieldnames,
self.writer.fieldnames)))
def write_csv_row(self, args):
if self.is_dict:
self.writer.writerow(dict(zip(
self.writer.fieldnames, map(self.encode, args))))
else:
self.writer.writerow(map(self.encode, args))
def encode(self, value):
# csv and StringIO cannot work with mixed encodings,
# so encode all with utf-8
return unicode(value).encode('utf-8')
class BaseCsvResponse(CsvDataMixin, HttpResponse):
"""Base CSV response class. Provides handling of CSV data."""
def __init__(self, request, template, context, content_type, **kwargs):
super(BaseCsvResponse, self).__init__()
self['Content-Disposition'] = 'attachment; filename="%s"' % (
kwargs.get("filename", "export.csv"),)
self['Content-Type'] = content_type
self.context = context
self.header = None
if template:
# Display some header info if provided as a template
header_template = django_template.loader.get_template(template)
context = django_template.RequestContext(request, self.context)
self.header = header_template.render(context)
if self.header:
self.out.write(self.encode(self.header))
self.write_csv_header()
for row in self.get_row_data():
self.write_csv_row(row)
self.out.flush()
self.content = self.out.getvalue()
self.out.close()
def get_row_data(self):
raise NotImplementedError("You must define a get_row_data method on %s"
% self.__class__.__name__)
if VERSION >= (1, 5, 0):
from django.http import StreamingHttpResponse # noqa
class BaseCsvStreamingResponse(CsvDataMixin, StreamingHttpResponse):
"""Base CSV Streaming class. Provides streaming response for CSV data.
"""
def __init__(self, request, template, context, content_type, **kwargs):
super(BaseCsvStreamingResponse, self).__init__()
self['Content-Disposition'] = 'attachment; filename="%s"' % (
kwargs.get("filename", "export.csv"),)
self['Content-Type'] = content_type
self.context = context
self.header = None
if template:
# Display some header info if provided as a template
header_template = django_template.loader.get_template(template)
context = django_template.RequestContext(request, self.context)
self.header = header_template.render(context)
self._closable_objects.append(self.out)
self.streaming_content = self.get_content()
def buffer(self):
buf = self.out.getvalue()
self.out.truncate(0)
return buf
def get_content(self):
if self.header:
self.out.write(self.encode(self.header))
self.write_csv_header()
yield self.buffer()
for row in self.get_row_data():
self.write_csv_row(row)
yield self.buffer()
def get_row_data(self):
raise NotImplementedError("You must define a get_row_data method "
"on %s" % self.__class__.__name__)
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