Synnefo » ./kamaki

# Copyright 2011-2012 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 urllib2 import quote

from threading import Thread

from json import dumps, loads

from time import time

import logging

from kamaki.clients.connection.kamakicon import KamakiHTTPConnection

from kamaki.clients.connection.errors import KamakiConnectionError

from kamaki.clients.connection.errors import KamakiResponseError

sendlog = logging.getLogger('clients.send')

datasendlog = logging.getLogger('data.send')

recvlog = logging.getLogger('clients.recv')

datarecvlog = logging.getLogger('data.recv')

class ClientError(Exception):

    def __init__(self, message, status=0, details=None):

        try:

            message += '' if message and message[-1] == '\n' else '\n'

            serv_stat, sep, new_msg = message.partition('{')

            new_msg = sep + new_msg[:-1 if new_msg.endswith('\n') else 0]

            json_msg = loads(new_msg)

            key = json_msg.keys()[0]

            serv_stat = serv_stat.strip()

            json_msg = json_msg[key]

            message = '%s %s (%s)\n' % (

                serv_stat,

                key,

                json_msg['message']) if (

                    'message' in json_msg) else '%s %s' % (serv_stat, key)

            status = json_msg.get('code', status)

            if 'details' in json_msg:

                if not details:

                    details = []

                if not isinstance(details, list):

                    details = [details]

                if json_msg['details']:

                    details.append(json_msg['details'])

        except Exception:

            pass

        finally:

            while message.endswith('\n\n'):

                message = message[:-1]

            super(ClientError, self).__init__(message)

            self.status = status if isinstance(status, int) else 0

            self.details = details if details else []

class SilentEvent(Thread):

    """ Thread-run method(*args, **kwargs)"""

    def __init__(self, method, *args, **kwargs):

        super(self.__class__, self).__init__()

        self.method = method

        self.args = args

        self.kwargs = kwargs

    @property

    def exception(self):

        return getattr(self, '_exception', False)

    @property

    def value(self):

        return getattr(self, '_value', None)

    def run(self):

        try:

            self._value = self.method(*(self.args), **(self.kwargs))

        except Exception as e:

            recvlog.debug('Thread %s got exception %s\n<%s %s' % (

                self,

                type(e),

                e.status if isinstance(e, ClientError) else '',

                e))

            self._exception = e

class Client(object):

    def __init__(self, base_url, token, http_client=KamakiHTTPConnection()):

        self.base_url = base_url

        self.token = token

        self.headers = {}

        self.DATE_FORMATS = [

            '%a %b %d %H:%M:%S %Y',

            '%A, %d-%b-%y %H:%M:%S GMT',

            '%a, %d %b %Y %H:%M:%S GMT']

        self.http_client = http_client

        self.MAX_THREADS = 7

    def _init_thread_limit(self, limit=1):

        assert isinstance(limit, int) and limit > 0, 'Thread limit not a +int'

        self._thread_limit = limit

        self._elapsed_old = 0.0

        self._elapsed_new = 0.0

    def _watch_thread_limit(self, threadlist):

        self._thread_limit = getattr(self, '_thread_limit', 1)

        self._elapsed_new = getattr(self, '_elapsed_new', 0.0)

        self._elapsed_old = getattr(self, '_elapsed_old', 0.0)

        recvlog.debug('# running threads: %s' % len(threadlist))

        if self._elapsed_old and self._elapsed_old >= self._elapsed_new and (

                self._thread_limit < self.MAX_THREADS):

            self._thread_limit += 1

        elif self._elapsed_old <= self._elapsed_new and self._thread_limit > 1:

            self._thread_limit -= 1

        self._elapsed_old = self._elapsed_new

        if len(threadlist) >= self._thread_limit:

            self._elapsed_new = 0.0

            for thread in threadlist:

                begin_time = time()

                thread.join()

                self._elapsed_new += time() - begin_time

            self._elapsed_new = self._elapsed_new / len(threadlist)

            return []

        return threadlist

    def _raise_for_status(self, r):

        status_msg = getattr(r, 'status', None) or ''

        try:

            message = '%s %s\n' % (status_msg, r.text)

        except:

            message = '%s %s\n' % (status_msg, r)

        status = getattr(r, 'status_code', getattr(r, 'status', 0))

        raise ClientError(message, status=status)

    def set_header(self, name, value, iff=True):

        """Set a header 'name':'value'"""

        if value is not None and iff:

            self.http_client.set_header(name, value)

    def set_param(self, name, value=None, iff=True):

        if iff:

            self.http_client.set_param(name, value)

    def request(

            self,

            method,

            path,

            async_headers={},

            async_params={},

            **kwargs):

        """In threaded/asynchronous requests, headers and params are not safe

        Therefore, the standard self.set_header/param system can be used only

        for headers and params that are common for all requests. All other

        params and headers should passes as

        @param async_headers

        @async_params

        E.g. in most queries the 'X-Auth-Token' header might be the same for

        all, but the 'Range' header might be different from request to request.

        """

        assert isinstance(method, str) or isinstance(method, unicode)

        assert method

        assert isinstance(path, str) or isinstance(path, unicode)

        assert path

        try:

            success = kwargs.pop('success', 200)

            data = kwargs.pop('data', None)

            self.http_client.headers.setdefault('X-Auth-Token', self.token)

            if 'json' in kwargs:

                data = dumps(kwargs.pop('json'))

                self.http_client.headers.setdefault(

                    'Content-Type',

                    'application/json')

            if data:

                self.http_client.headers.setdefault(

                    'Content-Length',

                    '%s' % len(data))

            sendlog.info('perform a %s @ %s', method, self.base_url)

            self.http_client.url = self.base_url

            self.http_client.path = quote(path.encode('utf8'))

            r = self.http_client.perform_request(

                method,

                data,

                async_headers,

                async_params)

            req = self.http_client

            sendlog.info('%s %s', method, req.url)

            headers = dict(req.headers)

            headers.update(async_headers)

            for key, val in headers.items():

                sendlog.info('\t%s: %s', key, val)

            sendlog.info('')

            if data:

                datasendlog.info(data)

            recvlog.info('%d %s', r.status_code, r.status)

            for key, val in r.headers.items():

                recvlog.info('%s: %s', key, val)

            if r.content:

                datarecvlog.info(r.content)

        except (KamakiResponseError, KamakiConnectionError) as err:

            from traceback import format_stack

            recvlog.debug('\n'.join(['%s' % type(err)] + format_stack()))

            self.http_client.reset_headers()

            self.http_client.reset_params()

            errstr = '%s' % err

            if not errstr:

                errstr = ('%s' % type(err))[7:-2]

            status = getattr(err, 'status', getattr(err, 'errno', 0))

            raise ClientError('%s\n' % errstr, status=status)

        finally:

            self.http_client.reset_headers()

            self.http_client.reset_params()

        if success is not None:

            # Success can either be an int or a collection

            success = (success,) if isinstance(success, int) else success

            if r.status_code not in success:

                r.release()

                self._raise_for_status(r)

        return r

    def delete(self, path, **kwargs):

        return self.request('delete', path, **kwargs)

    def get(self, path, **kwargs):

        return self.request('get', path, **kwargs)

    def head(self, path, **kwargs):

        return self.request('head', path, **kwargs)

    def post(self, path, **kwargs):

        return self.request('post', path, **kwargs)

    def put(self, path, **kwargs):

        return self.request('put', path, **kwargs)

    def copy(self, path, **kwargs):

        return self.request('copy', path, **kwargs)

    def move(self, path, **kwargs):

        return self.request('move', path, **kwargs)