Synnefo » ./kamaki

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

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# without modification, are permitted provided that the following

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#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

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# 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

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import json

import logging

from httplib import HTTPConnection, HTTPSConnection

from urlparse import urlparse

from . import ClientError

log = logging.getLogger('kamaki.clients')

class HTTPClient(object):

    def __init__(self, config):

        self.config = config

    @property

    def url(self):

        url = self.config.get('url')

        if not url:

            raise ClientError('No URL was given')

        return url

    @property

    def token(self):

        token = self.config.get('token')

        if not token:

            raise ClientError('No token was given')

        return token

    def raw_http_cmd(self, method, path, body=None, headers=None, success=200,

                     json_reply=False, skip_read=False):

        p = urlparse(self.url)

        path = p.path + path

        if p.scheme == 'http':

            conn = HTTPConnection(p.netloc)

        elif p.scheme == 'https':

            conn = HTTPSConnection(p.netloc)

        else:

            raise ClientError('Unknown URL scheme')

        headers = headers or {}

        headers['X-Auth-Token'] = self.token

        if body:

            headers.setdefault('Content-Type', 'application/json')

            headers['Content-Length'] = len(body)

        log.debug('>' * 50)

        log.debug('%s %s', method, path)

        for key, val in headers.items():

            log.debug('%s: %s', key, val)

        if body:

            log.debug('')

            log.debug(body)

        conn.request(method, path, body, headers)

        resp = conn.getresponse()

        reply = '' if skip_read else resp.read()

        log.debug('<' * 50)

        log.info('%d %s', resp.status, resp.reason)

        for key, val in resp.getheaders():

            log.info('%s: %s', key.capitalize(), val)

        log.info('')

        log.debug(reply)

        log.debug('-' * 50)

        if json_reply:

            try:

                reply = json.loads(reply) if reply else {}

            except ValueError:

                raise ClientError('Did not receive valid JSON reply',

                                  resp.status, reply)

        if success and resp.status != success:

            if len(reply) == 1:

                if json_reply:

                    key = reply.keys()[0]

                    val = reply[key]

                    message = '%s: %s' % (key, val.get('message', ''))

                    details = val.get('details', '')

                else:

                    message = reply

                    details = ''

                raise ClientError(message, resp.status, details)

            else:

                raise ClientError('Invalid response from the server')

        return resp, reply

    def http_cmd(self, method, path, body=None, headers=None, success=200):

        resp, reply = self.raw_http_cmd(method, path, body, headers, success,

                                        json_reply=True)

        return reply

    def http_get(self, path, success=200):

        return self.http_cmd('GET', path, success=success)

    def http_post(self, path, body=None, headers=None, success=202):

        return self.http_cmd('POST', path, body, headers, success)

    def http_put(self, path, body=None, headers=None, success=204):

        return self.http_cmd('PUT', path, body, headers, success)

    def http_delete(self, path, success=204):

        return self.http_cmd('DELETE', path, success=success)