本文整理汇总了Python中chunkobject.ChunkObject.prepare_chunk方法的典型用法代码示例。如果您正苦于以下问题：Python ChunkObject.prepare_chunk方法的具体用法？Python ChunkObject.prepare_chunk怎么用？Python ChunkObject.prepare_chunk使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类chunkobject.ChunkObject的用法示例。
在下文中一共展示了ChunkObject.prepare_chunk方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: CloudFilesFD
# 需要导入模块: from chunkobject import ChunkObject [as 别名]
# 或者: from chunkobject.ChunkObject import prepare_chunk [as 别名]
class CloudFilesFD(object):
'''Acts like a file() object, but attached to a cloud files object'''
def __init__(self, cffs, container, obj, mode):
self.cffs = cffs
self.container = container
self.name = obj
self.mode = mode
self.closed = False
self.total_size = 0
self.stream = None
if not all([container, obj]):
self.closed = True
raise IOSError(EPERM, 'Container and object requred')
self.container = self.cffs._get_container(self.container)
if 'r' in self.mode:
self.obj = self.container.get_object(self.name)
logging.debug("read fd obj.name=%r obj.size=%r" % (self.obj.name, self.obj.size))
else: #write
self.obj = ChunkObject(self.container, obj)
self.obj.content_type = mimetypes.guess_type(obj)[0]
self.obj.prepare_chunk()
def write(self, data):
'''Write data to the object'''
if 'r' in self.mode:
raise IOSError(EPERM, "Can't write to stream opened for read")
self.obj.send_chunk(data)
def close(self):
'''Close the object and finish the data transfer'''
if 'r' in self.mode:
return
self.obj.finish_chunk()
def read(self, size=65536):
'''Read data from the object.
We can use just one request because 'seek' is not supported.
NB: It uses the size passed into the first call for all subsequent calls'''
if not self.stream:
self.stream = self.obj.stream(size)
logging.debug("read size=%r, total_size=%r, obj.size=%r" % (size, self.total_size, self.obj.size))
try:
buff = self.stream.next()
self.total_size += len(buff)
except StopIteration:
return ""
else:
return buff
def seek(self, *kargs, **kwargs):
'''Seek in the object: FIXME doesn't work and raises an error'''
logging.debug("seek args=%s, kargs=%s" % (str(kargs), str(kwargs)))
raise IOSError(EPERM, "Seek not implemented")示例2: CloudFilesFD
# 需要导入模块: from chunkobject import ChunkObject [as 别名]
# 或者: from chunkobject.ChunkObject import prepare_chunk [as 别名]
class CloudFilesFD(object):
"""Acts like a file() object, but attached to a cloud files object"""
def __init__(self, cffs, container, obj, mode):
self.cffs = cffs
self.container = container
self.name = obj
self.mode = mode
self.closed = False
self.total_size = 0
if not all([container, obj]):
self.closed = True
raise IOSError(EPERM, "Container and object requred")
self.container = self.cffs._get_container(self.container)
if "r" in self.mode:
self.obj = self.container.get_object(self.name)
logging.debug("read fd obj.name=%r obj.size=%r" % (self.obj.name, self.obj.size))
else: # write
self.obj = ChunkObject(self.container, obj)
self.obj.content_type = mimetypes.guess_type(obj)[0]
self.obj.prepare_chunk()
def write(self, data):
"""Write data to the object"""
if "r" in self.mode:
raise IOSError(EPERM, "Can't write to stream opened for read")
self.obj.send_chunk(data)
def close(self):
"""Close the object and finish the data transfer"""
if "r" in self.mode:
return
self.obj.finish_chunk()
def read(self, size=65536):
"""Read data from the object"""
logging.debug("read size=%r, total_size=%r, obj.size=%r" % (size, self.total_size, self.obj.size))
readsize = size
if (self.total_size + size) > self.obj.size:
readsize = self.obj.size - self.total_size
if self.total_size >= self.obj.size:
return ""
else:
offset = self.total_size
self.total_size += size
return self.obj.read(size=readsize, offset=offset)
def seek(self, *kargs, **kwargs):
"""Seek in the object: FIXME doesn't work and raises an error"""
logging.debug("seek args=%s, kargs=%s" % (str(kargs), str(kwargs)))
raise IOSError(EPERM, "Seek not implemented")示例3: CloudFilesFD
# 需要导入模块: from chunkobject import ChunkObject [as 别名]
# 或者: from chunkobject.ChunkObject import prepare_chunk [as 别名]
class CloudFilesFD(object):
'''Acts like a file() object, but attached to a cloud files object'''
def __init__(self, cffs, container, obj, mode):
self.cffs = cffs
self.container = container
self.name = obj
self.mode = mode
self.closed = False
self.total_size = 0
self.stream = None
self.headers = dict()
if not all([container, obj]):
self.closed = True
raise IOSError(EPERM, 'Container and object required')
self.container = self.cffs._get_container(self.container)
if 'r' in self.mode:
self.obj = self.container.get_object(self.name)
logging.debug("read fd obj.name=%r obj.size=%r" % (self.obj.name, self.obj.size))
else: #write
self.obj = ChunkObject(self.container, obj)
self.obj.content_type = mimetypes.guess_type(obj)[0]
self.obj.prepare_chunk()
def write(self, data):
'''Write data to the object'''
if 'r' in self.mode:
raise IOSError(EPERM, "Can't write to stream opened for read")
self.obj.send_chunk(data)
def close(self):
'''Close the object and finish the data transfer'''
if 'r' in self.mode:
return
self.obj.finish_chunk()
def read(self, size=65536):
'''Read data from the object.
We can use just one request because 'seek' is not fully supported.
NB: It uses the size passed into the first call for all subsequent calls'''
if not self.stream:
self.stream = self.obj.stream(size, hdrs=self.headers)
logging.debug("read size=%r, total_size=%r, obj.size=%r" % (size, self.total_size, self.obj.size))
try:
buff = self.stream.next()
self.total_size += len(buff)
except StopIteration:
return ""
else:
return buff
def seek(self, offset, whence=None):
'''Seek in the object.
It's supported only for read operations because of the object storage limitations.'''
logging.debug("seek offset=%s, whence=%s" % (str(offset), str(whence)))
if 'r' in self.mode:
if not whence:
offs = offset
elif whence == 1:
offs = self.total_size + offset
elif whence == 2:
offs = self.obj.size - offset
else:
raise IOSError(EPERM, "Invalid file offset")
if offs < 0 or offs > self.obj.size:
raise IOSError(EPERM, "Invalid file offset")
# we need to start over after a seek call
if self.stream:
self.stream = None
self.obj = self.container.get_object(self.name)
self.headers['Range'] = "bytes=%s-" % offs
self.total_size = offs
else:
raise IOSError(EPERM, "Seek not available for write operations")