Synnefo » ./kamaki

# Copyright 2012 GRNET S.A. All rights reserved.

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, self.list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, self.list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

from urlparse import urlparse

#from .pool.http import get_http_connection

from synnefo.lib.pool.http import get_http_connection

from kamaki.clients.connection import HTTPConnection, HTTPResponse, HTTPConnectionError

from gevent.dns import DNSError

from json import loads

from time import sleep

from httplib import ResponseNotReady

class KamakiHTTPResponse(HTTPResponse):

    def _get_response(self):

        if self.prefetched:

            return

        ready = False

        while not ready:

            try:

                r = self.request.getresponse()

            except ResponseNotReady:

                sleep(0.001)

                continue

            break

        self.prefetched = True

        headers = {}

        for k,v in r.getheaders():

            headers.update({k:v})

        self.headers = headers

        self.content = r.read()

        self.status_code = r.status

        self.status = r.reason

        self.request.close()

    @property 

    def text(self):

        self._get_response()

        return self._content

    @text.setter

    def test(self, v):

        pass

    @property 

    def json(self):

        self._get_response()

        try:

            return loads(self._content)

        except ValueError as err:

            HTTPConnectionError('Response not formated in JSON', details=unicode(err), status=702)

    @json.setter

    def json(self, v):

        pass

    def release(self):

        if not self.prefetched:

            self.request.close()

class KamakiHTTPConnection(HTTPConnection):

    def _retrieve_connection_info(self, extra_params={}):

        """ return (scheme, netloc, url?with&params) """

        url = self.url

        params = dict(self.params)

        for k,v in extra_params.items():

            params[k] = v

        for i,(key, val) in enumerate(params.items()):

            param_str = ('?' if i == 0 else '&') + unicode(key) 

            if val is not None:

                param_str+= '='+unicode(val)

            url += param_str

        parsed = urlparse(self.url)

        self.url = url

        return (parsed.scheme, parsed.netloc)

    def perform_request(self, method=None, data=None, async_headers={}, async_params={}):

        (scheme, netloc) = self._retrieve_connection_info(extra_params=async_params)

        headers = dict(self.headers)

        for k,v in async_headers.items():

            headers[k] = v

        #de-unicode headers to prepare them for http

        http_headers = {}

        for k,v in headers.items():

            http_headers[str(k)] = str(v)

        #get connection from pool

        conn = get_http_connection(netloc=netloc, scheme=scheme)

        try:

            #Be carefull, all non-body variables should not be unicode

            conn.request(method = str(method.upper()),

                url=str(self.url),

                headers=http_headers,

                body=data)

        except Exception as err:

            conn.close()

            if isinstance(err, DNSError):

                raise HTTPConnectionError('Cannot connect to %s'%self.url, status=701,

                    details='%s: %s'%(type(err),unicode(err)))

            raise

        return KamakiHTTPResponse(conn)