Synnefo » ./kamaki

# Copyright 2011-2012 GRNET S.A. All rights reserved.

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

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import json

import logging

from kamaki.clients.connection import HTTPConnectionError

from kamaki.clients.connection.kamakicon import KamakiHTTPConnection

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

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

class ClientError(Exception):

    def __init__(self, message, status=0, details=''):

        super(ClientError, self).__init__(message, status, details)

        self.message = message

        self.status = status

        self.details = details

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

    def _raise_for_status(self, r):

        message = "%d %s" % (r.status_code, r.status)

        try:

            details = r.text

        except:

            details = ''

        raise ClientError(message, r.status_code, details)

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

        """Set a header 'name':'value' provided value is not None and iff is True"""

        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 set_default_header(self, name, value):

        self.http_client.headers.setdefault(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.

        """

        try:

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

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

            self.set_default_header('X-Auth-Token', self.token)

            if 'json' in kwargs:

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

                self.set_default_header('Content-Type', 'application/json')

            if data:

                self.set_default_header('Content-Length', unicode(len(data)))

            self.http_client.url = self.base_url + path

            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:

                sendlog.info('%s', 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:

            #    recvlog.debug(r.content)

            if success is not None:

                # Success can either be an in 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)

        except Exception as err:

            self.http_client.reset_headers()

            self.http_client.reset_params()

            errmsg = getattr(err, 'message', unicode(err))

            errdetails = getattr(err, 'details', '')+' (%s)'%type(err)

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

            raise ClientError(message=errmsg,status=errstatus,details=errdetails)

        self.http_client.reset_headers()

        self.http_client.reset_params()

        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)