root / kamaki / clients / __init__.py @ 27abfa9f
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# Copyright 2011-2012 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above
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# copyright notice, self.list of conditions and the following
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# disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, self.list of conditions and the following
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# disclaimer in the documentation and/or other materials
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# provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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from urllib2 import quote |
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from threading import Thread |
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from json import dumps, loads |
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from time import time |
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import logging |
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from kamaki.clients.connection.kamakicon import KamakiHTTPConnection |
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from kamaki.clients.connection.errors import KamakiConnectionError |
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from kamaki.clients.connection.errors import KamakiResponseError |
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sendlog = logging.getLogger('clients.send')
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datasendlog = logging.getLogger('data.send')
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recvlog = logging.getLogger('clients.recv')
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datarecvlog = logging.getLogger('data.recv')
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class ClientError(Exception): |
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def __init__(self, message, status=0, details=None): |
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try:
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message += '' if message and message[-1] == '\n' else '\n' |
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serv_stat, sep, new_msg = message.partition('{')
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new_msg = sep + new_msg[:-1 if new_msg.endswith('\n') else 0] |
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json_msg = loads(new_msg) |
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key = json_msg.keys()[0]
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serv_stat = serv_stat.strip() |
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json_msg = json_msg[key] |
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message = '%s %s (%s)\n' % (
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serv_stat, |
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key, |
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json_msg['message']) if ( |
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'message' in json_msg) else '%s %s' % (serv_stat, key) |
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status = json_msg.get('code', status)
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if 'details' in json_msg: |
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if not details: |
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details = [] |
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if not isinstance(details, list): |
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details = [details] |
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if json_msg['details']: |
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details.append(json_msg['details'])
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except Exception: |
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pass
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finally:
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super(ClientError, self).__init__(message) |
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self.status = status if isinstance(status, int) else 0 |
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self.details = details if details else [] |
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class SilentEvent(Thread): |
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""" Thread-run method(*args, **kwargs)"""
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def __init__(self, method, *args, **kwargs): |
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super(self.__class__, self).__init__() |
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self.method = method
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self.args = args
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self.kwargs = kwargs
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@property
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def exception(self): |
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return getattr(self, '_exception', False) |
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@property
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def value(self): |
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return getattr(self, '_value', None) |
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def run(self): |
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try:
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self._value = self.method(*(self.args), **(self.kwargs)) |
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except Exception as e: |
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recvlog.debug('Thread %s got exception %s\n<%s %s' % (
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self,
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type(e),
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e.status if isinstance(e, ClientError) else '', |
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e)) |
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self._exception = e
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class Client(object): |
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MAX_THREADS = 7
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def __init__(self, base_url, token, http_client=KamakiHTTPConnection()): |
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self.base_url = base_url
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self.token = token
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self.headers = {}
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self.DATE_FORMATS = [
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'%a %b %d %H:%M:%S %Y',
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'%A, %d-%b-%y %H:%M:%S GMT',
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'%a, %d %b %Y %H:%M:%S GMT']
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self.http_client = http_client
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def _init_thread_limit(self, limit=1): |
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self._thread_limit = limit
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self._elapsed_old = 0.0 |
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self._elapsed_new = 0.0 |
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def _watch_thread_limit(self, threadlist): |
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recvlog.debug('# running threads: %s' % len(threadlist)) |
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if (self._elapsed_old > self._elapsed_new) and ( |
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self._thread_limit < self.MAX_THREADS): |
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self._thread_limit += 1 |
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elif self._elapsed_old < self._elapsed_new and self._thread_limit > 1: |
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self._thread_limit -= 1 |
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self._elapsed_old = self._elapsed_new |
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if len(threadlist) >= self._thread_limit: |
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self._elapsed_new = 0.0 |
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for thread in threadlist: |
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begin_time = time() |
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thread.join() |
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self._elapsed_new += time() - begin_time
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self._elapsed_new = self._elapsed_new / len(threadlist) |
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return []
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return threadlist
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def _raise_for_status(self, r): |
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status_msg = getattr(r, 'status', '') |
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try:
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message = '%s %s\n' % (status_msg, r.text)
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except:
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message = '%s %s\n' % (status_msg, r)
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status = getattr(r, 'status_code', getattr(r, 'status', 0)) |
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raise ClientError(message, status=status)
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def set_header(self, name, value, iff=True): |
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"""Set a header 'name':'value'"""
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if value is not None and iff: |
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self.http_client.set_header(name, value)
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def set_param(self, name, value=None, iff=True): |
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if iff:
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self.http_client.set_param(name, value)
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def set_default_header(self, name, value): |
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self.http_client.headers.setdefault(name, value)
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def request( |
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self,
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method, |
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path, |
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async_headers={}, |
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async_params={}, |
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**kwargs): |
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"""In threaded/asynchronous requests, headers and params are not safe
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Therefore, the standard self.set_header/param system can be used only
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for headers and params that are common for all requests. All other
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params and headers should passes as
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@param async_headers
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@async_params
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E.g. in most queries the 'X-Auth-Token' header might be the same for
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all, but the 'Range' header might be different from request to request.
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"""
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try:
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success = kwargs.pop('success', 200) |
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data = kwargs.pop('data', None) |
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self.set_default_header('X-Auth-Token', self.token) |
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if 'json' in kwargs: |
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data = dumps(kwargs.pop('json'))
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self.set_default_header('Content-Type', 'application/json') |
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if data:
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self.set_default_header('Content-Length', '%s' % len(data)) |
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sendlog.info('perform a %s @ %s', method, self.base_url) |
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self.http_client.url = self.base_url |
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self.http_client.path = quote(path.encode('utf8')) |
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r = self.http_client.perform_request(
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method, |
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data, |
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async_headers, |
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async_params) |
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req = self.http_client
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sendlog.info('%s %s', method, req.url)
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headers = dict(req.headers)
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headers.update(async_headers) |
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for key, val in headers.items(): |
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sendlog.info('\t%s: %s', key, val)
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sendlog.info('')
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if data:
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datasendlog.info(data) |
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recvlog.info('%d %s', r.status_code, r.status)
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for key, val in r.headers.items(): |
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recvlog.info('%s: %s', key, val)
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if r.content:
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datarecvlog.info(r.content) |
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except (KamakiResponseError, KamakiConnectionError) as err: |
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from traceback import format_stack |
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recvlog.debug('\n'.join(['%s' % type(err)] + format_stack())) |
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self.http_client.reset_headers()
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self.http_client.reset_params()
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errstr = '%s' % err
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if not errstr: |
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errstr = ('%s' % type(err))[7:-2] |
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status = getattr(err, 'status', getattr(err, 'errno', 0)) |
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raise ClientError('%s\n' % errstr, status=status) |
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self.http_client.reset_headers()
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self.http_client.reset_params()
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if success is not None: |
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# Success can either be an int or a collection
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success = (success,) if isinstance(success, int) else success |
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if r.status_code not in success: |
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r.release() |
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self._raise_for_status(r)
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return r
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def delete(self, path, **kwargs): |
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return self.request('delete', path, **kwargs) |
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def get(self, path, **kwargs): |
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return self.request('get', path, **kwargs) |
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def head(self, path, **kwargs): |
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return self.request('head', path, **kwargs) |
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def post(self, path, **kwargs): |
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return self.request('post', path, **kwargs) |
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def put(self, path, **kwargs): |
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return self.request('put', path, **kwargs) |
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def copy(self, path, **kwargs): |
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return self.request('copy', path, **kwargs) |
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def move(self, path, **kwargs): |
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return self.request('move', path, **kwargs) |