root / kamaki / clients / connection / kamakicon.py @ 5d16ef46
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# Copyright 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 urlparse import urlparse |
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from objpool.http import get_http_connection |
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from kamaki.clients.connection import KamakiConnection, KamakiResponse |
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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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from json import loads |
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from time import sleep |
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from httplib import ResponseNotReady |
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class KamakiHTTPResponse(KamakiResponse): |
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def _get_response(self): |
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if self.prefetched: |
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return
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ready = False
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while not ready: |
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try:
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r = self.request.getresponse()
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except ResponseNotReady:
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sleep(0.001)
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continue
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break
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self.prefetched = True |
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headers = {} |
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for k, v in r.getheaders(): |
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headers.update({k: v}) |
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self.headers = headers
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self.content = r.read()
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self.status_code = r.status
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self.status = r.reason
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self.request.close()
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@property
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def text(self): |
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"""
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:returns: (str) content
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"""
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self._get_response()
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return unicode(self._content) |
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@text.setter
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def text(self, v): |
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pass
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@property
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def json(self): |
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"""
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:returns: (dict) the json-formated content
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:raises KamakiResponseError: if content is not json formated
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"""
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self._get_response()
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try:
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return loads(self._content) |
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except ValueError as err: |
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KamakiResponseError('Response not formated in JSON - %s' % err)
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@json.setter
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def json(self, v): |
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pass
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def release(self): |
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""" Release the connection. Should always be called if the response
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content hasn't been used.
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"""
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if not self.prefetched: |
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self.request.close()
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class KamakiHTTPConnection(KamakiConnection): |
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def _retrieve_connection_info(self, extra_params={}): |
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"""
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:param extra_params: (dict) key:val for url parameters
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:returns: (scheme, netloc, url?with¶ms)
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"""
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if self.url: |
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url = self.url if self.url[-1] == '/' else (self.url + '/') |
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else:
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url = 'http://127.0.0.1'
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if self.path: |
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url += self.path[1:] if self.path[0] == '/' else self.path |
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params = dict(self.params) |
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params.update(extra_params) |
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for i, (key, val) in enumerate(params.items()): |
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url += '%s%s%s' % (
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'&' if i else '?', |
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key, |
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'=%s' % val if val else '') |
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parsed = urlparse(url) |
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self.url = url
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self.path = parsed.path or '/' |
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if parsed.query:
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self.path += '?%s' % parsed.query |
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return (parsed.scheme, parsed.netloc)
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def perform_request( |
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self,
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method=None, data=None, async_headers={}, async_params={}): |
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"""
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:param method: (str) http method ('get', 'post', etc.)
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:param data: (binary object)
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:param async_headers: (dict) key:val headers that are used only for one
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request instance as opposed to self.headers, which remain to be
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used by following or parallel requests
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:param async_params: (dict) key:val url parameters that are used only
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for one request instance as opposed to self.params, which remain to
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be used by following or parallel requests
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:returns: (KamakiHTTPResponse) a response object
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:raises KamakiConnectionError: Connection failures
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"""
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(scheme, netloc) = self._retrieve_connection_info(async_params)
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headers = dict(self.headers) |
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for k, v in async_headers.items(): |
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headers[k] = v |
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#de-unicode headers to prepare them for http
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http_headers = {} |
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for k, v in headers.items(): |
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http_headers[str(k)] = str(v) |
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#get connection from pool
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try:
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conn = get_http_connection(netloc=netloc, scheme=scheme) |
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except ValueError as ve: |
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raise KamakiConnectionError(
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'Cannot establish connection to %s %s' % (self.url, ve), |
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errno=-1)
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try:
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#Be carefull, all non-body variables should not be unicode
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conn.request( |
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method=str(method.upper()),
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url=str(self.path), |
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headers=http_headers, |
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body=data) |
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except IOError as ioe: |
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raise KamakiConnectionError(
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'Cannot connect to %s: %s' % (self.url, ioe.strerror), |
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errno=ioe.errno) |
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except Exception as err: |
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from traceback import format_stack |
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from kamaki.clients import recvlog |
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recvlog.debug('\n'.join(['%s' % type(err)] + format_stack())) |
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conn.close() |
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raise
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return KamakiHTTPResponse(conn)
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