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Phuoc
2015-03-31 20:26:20 +00:00
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# (c) 2005 Ian Bicking and contributors; written for Paste (http://pythonpaste.org)
# Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
# (c) 2005 Clark C. Evans
# This module is part of the Python Paste Project and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
# This code was written with funding by http://prometheusresearch.com
"""
Upload Progress Monitor
This is a WSGI middleware component which monitors the status of files
being uploaded. It includes a small query application which will return
a list of all files being uploaded by particular session/user.
>>> from paste.httpserver import serve
>>> from paste.urlmap import URLMap
>>> from paste.auth.basic import AuthBasicHandler
>>> from paste.debug.debugapp import SlowConsumer, SimpleApplication
>>> # from paste.progress import *
>>> realm = 'Test Realm'
>>> def authfunc(username, password):
... return username == password
>>> map = URLMap({})
>>> ups = UploadProgressMonitor(map, threshold=1024)
>>> map['/upload'] = SlowConsumer()
>>> map['/simple'] = SimpleApplication()
>>> map['/report'] = UploadProgressReporter(ups)
>>> serve(AuthBasicHandler(ups, realm, authfunc))
serving on...
.. note::
This is experimental, and will change in the future.
"""
import time
from paste.wsgilib import catch_errors
DEFAULT_THRESHOLD = 1024 * 1024 # one megabyte
DEFAULT_TIMEOUT = 60*5 # five minutes
ENVIRON_RECEIVED = 'paste.bytes_received'
REQUEST_STARTED = 'paste.request_started'
REQUEST_FINISHED = 'paste.request_finished'
class _ProgressFile(object):
"""
This is the input-file wrapper used to record the number of
``paste.bytes_received`` for the given request.
"""
def __init__(self, environ, rfile):
self._ProgressFile_environ = environ
self._ProgressFile_rfile = rfile
self.flush = rfile.flush
self.write = rfile.write
self.writelines = rfile.writelines
def __iter__(self):
environ = self._ProgressFile_environ
riter = iter(self._ProgressFile_rfile)
def iterwrap():
for chunk in riter:
environ[ENVIRON_RECEIVED] += len(chunk)
yield chunk
return iter(iterwrap)
def read(self, size=-1):
chunk = self._ProgressFile_rfile.read(size)
self._ProgressFile_environ[ENVIRON_RECEIVED] += len(chunk)
return chunk
def readline(self):
chunk = self._ProgressFile_rfile.readline()
self._ProgressFile_environ[ENVIRON_RECEIVED] += len(chunk)
return chunk
def readlines(self, hint=None):
chunk = self._ProgressFile_rfile.readlines(hint)
self._ProgressFile_environ[ENVIRON_RECEIVED] += len(chunk)
return chunk
class UploadProgressMonitor(object):
"""
monitors and reports on the status of uploads in progress
Parameters:
``application``
This is the next application in the WSGI stack.
``threshold``
This is the size in bytes that is needed for the
upload to be included in the monitor.
``timeout``
This is the amount of time (in seconds) that a upload
remains in the monitor after it has finished.
Methods:
``uploads()``
This returns a list of ``environ`` dict objects for each
upload being currently monitored, or finished but whose time
has not yet expired.
For each request ``environ`` that is monitored, there are several
variables that are stored:
``paste.bytes_received``
This is the total number of bytes received for the given
request; it can be compared with ``CONTENT_LENGTH`` to
build a percentage complete. This is an integer value.
``paste.request_started``
This is the time (in seconds) when the request was started
as obtained from ``time.time()``. One would want to format
this for presentation to the user, if necessary.
``paste.request_finished``
This is the time (in seconds) when the request was finished,
canceled, or otherwise disconnected. This is None while
the given upload is still in-progress.
TODO: turn monitor into a queue and purge queue of finished
requests that have passed the timeout period.
"""
def __init__(self, application, threshold=None, timeout=None):
self.application = application
self.threshold = threshold or DEFAULT_THRESHOLD
self.timeout = timeout or DEFAULT_TIMEOUT
self.monitor = []
def __call__(self, environ, start_response):
length = environ.get('CONTENT_LENGTH', 0)
if length and int(length) > self.threshold:
# replace input file object
self.monitor.append(environ)
environ[ENVIRON_RECEIVED] = 0
environ[REQUEST_STARTED] = time.time()
environ[REQUEST_FINISHED] = None
environ['wsgi.input'] = \
_ProgressFile(environ, environ['wsgi.input'])
def finalizer(exc_info=None):
environ[REQUEST_FINISHED] = time.time()
return catch_errors(self.application, environ,
start_response, finalizer, finalizer)
return self.application(environ, start_response)
def uploads(self):
return self.monitor
class UploadProgressReporter(object):
"""
reports on the progress of uploads for a given user
This reporter returns a JSON file (for use in AJAX) listing the
uploads in progress for the given user. By default, this reporter
uses the ``REMOTE_USER`` environment to compare between the current
request and uploads in-progress. If they match, then a response
record is formed.
``match()``
This member function can be overriden to provide alternative
matching criteria. It takes two environments, the first
is the current request, the second is a current upload.
``report()``
This member function takes an environment and builds a
``dict`` that will be used to create a JSON mapping for
the given upload. By default, this just includes the
percent complete and the request url.
"""
def __init__(self, monitor):
self.monitor = monitor
def match(self, search_environ, upload_environ):
if search_environ.get('REMOTE_USER', None) == \
upload_environ.get('REMOTE_USER', 0):
return True
return False
def report(self, environ):
retval = { 'started': time.strftime("%Y-%m-%d %H:%M:%S",
time.gmtime(environ[REQUEST_STARTED])),
'finished': '',
'content_length': environ.get('CONTENT_LENGTH'),
'bytes_received': environ[ENVIRON_RECEIVED],
'path_info': environ.get('PATH_INFO',''),
'query_string': environ.get('QUERY_STRING','')}
finished = environ[REQUEST_FINISHED]
if finished:
retval['finished'] = time.strftime("%Y:%m:%d %H:%M:%S",
time.gmtime(finished))
return retval
def __call__(self, environ, start_response):
body = []
for map in [self.report(env) for env in self.monitor.uploads()
if self.match(environ, env)]:
parts = []
for k, v in map.items():
v = str(v).replace("\\", "\\\\").replace('"', '\\"')
parts.append('%s: "%s"' % (k, v))
body.append("{ %s }" % ", ".join(parts))
body = "[ %s ]" % ", ".join(body)
start_response("200 OK", [('Content-Type', 'text/plain'),
('Content-Length', len(body))])
return [body]
__all__ = ['UploadProgressMonitor', 'UploadProgressReporter']
if "__main__" == __name__:
import doctest
doctest.testmod(optionflags=doctest.ELLIPSIS)