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
|
"""CherryPy Library"""
# Deprecated in CherryPy 3.2 -- remove in CherryPy 3.3
from cherrypy.lib.reprconf import unrepr, modules, attributes
def is_iterator(obj):
'''Returns a boolean indicating if the object provided implements
the iterator protocol (i.e. like a generator). This will return
false for objects which iterable, but not iterators themselves.'''
from types import GeneratorType
if isinstance(obj, GeneratorType):
return True
elif not hasattr(obj, '__iter__'):
return False
else:
# Types which implement the protocol must return themselves when
# invoking 'iter' upon them.
return iter(obj) is obj
def is_closable_iterator(obj):
# Not an iterator.
if not is_iterator(obj):
return False
# A generator - the easiest thing to deal with.
import inspect
if inspect.isgenerator(obj):
return True
# A custom iterator. Look for a close method...
if not (hasattr(obj, 'close') and callable(obj.close)):
return False
# ... which doesn't require any arguments.
try:
inspect.getcallargs(obj.close)
except TypeError:
return False
else:
return True
class file_generator(object):
"""Yield the given input (a file object) in chunks (default 64k). (Core)"""
def __init__(self, input, chunkSize=65536):
self.input = input
self.chunkSize = chunkSize
def __iter__(self):
return self
def __next__(self):
chunk = self.input.read(self.chunkSize)
if chunk:
return chunk
else:
if hasattr(self.input, 'close'):
self.input.close()
raise StopIteration()
next = __next__
def file_generator_limited(fileobj, count, chunk_size=65536):
"""Yield the given file object in chunks, stopping after `count`
bytes has been emitted. Default chunk size is 64kB. (Core)
"""
remaining = count
while remaining > 0:
chunk = fileobj.read(min(chunk_size, remaining))
chunklen = len(chunk)
if chunklen == 0:
return
remaining -= chunklen
yield chunk
def set_vary_header(response, header_name):
"Add a Vary header to a response"
varies = response.headers.get("Vary", "")
varies = [x.strip() for x in varies.split(",") if x.strip()]
if header_name not in varies:
varies.append(header_name)
response.headers['Vary'] = ", ".join(varies)
|
