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resource.py
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resource.py
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# Licensed to Cloudera, Inc. under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. Cloudera, Inc. licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import os
try:
import json
except ImportError:
import simplejson as json
import logging
import posixpath
import time
import socket
try:
import socks
socks_server = os.environ.get("SOCKS_SERVER", None)
if socks_server:
host, port = socks_server.split(":")
socks.setdefaultproxy(socks.PROXY_TYPE_SOCKS5, host, int(port))
socket.socket = socks.socksocket
except ImportError:
pass
import urllib2
LOG = logging.getLogger(__name__)
class Resource(object):
"""
Encapsulates a resource, and provides actions to invoke on it.
"""
def __init__(self, client, relpath=""):
"""
@param client: A Client object.
@param relpath: The relative path of the resource.
"""
self._client = client
self._path = relpath.strip('/')
self.retries = 3
self.retry_sleep = 3
@property
def base_url(self):
return self._client.base_url
def _join_uri(self, relpath):
if relpath is None:
return self._path
return self._path + posixpath.normpath('/' + relpath)
def invoke(self, method, relpath=None, params=None, data=None, headers=None):
"""
Invoke an API method.
@return: Raw body or JSON dictionary (if response content type is JSON).
"""
path = self._join_uri(relpath)
resp = self._client.execute(method,
path,
params=params,
data=data,
headers=headers)
try:
body = resp.read()
except Exception, ex:
raise Exception("Command '%s %s' failed: %s" %
(method, path, ex))
self._client.logger.debug(
"%s Got response: %s%s" %
(method, body[:32], len(body) > 32 and "..." or ""))
# Is the response application/json?
if len(body) != 0 and \
resp.info().getmaintype() == "application" and \
resp.info().getsubtype() == "json":
try:
json_dict = json.loads(body)
return json_dict
except Exception, ex:
self._client.logger.exception('JSON decode error: %s' % (body,))
raise ex
else:
return body
def get(self, relpath=None, params=None):
"""
Invoke the GET method on a resource.
@param relpath: Optional. A relative path to this resource's path.
@param params: Key-value data.
@return: A dictionary of the JSON result.
"""
for retry in xrange(self.retries + 1):
if retry:
time.sleep(self.retry_sleep)
try:
return self.invoke("GET", relpath, params)
except (socket.error, urllib2.URLError) as e:
if "timed out" in str(e).lower():
log_message = "Timeout issuing GET request for %s." \
% (self._join_uri(relpath), )
if retry < self.retries:
log_message += " Will retry."
else:
log_message += " No retries left."
LOG.warn(log_message, exc_info=True)
else:
raise
else:
raise e
def delete(self, relpath=None, params=None):
"""
Invoke the DELETE method on a resource.
@param relpath: Optional. A relative path to this resource's path.
@param params: Key-value data.
@return: A dictionary of the JSON result.
"""
return self.invoke("DELETE", relpath, params)
def post(self, relpath=None, params=None, data=None, contenttype=None):
"""
Invoke the POST method on a resource.
@param relpath: Optional. A relative path to this resource's path.
@param params: Key-value data.
@param data: Optional. Body of the request.
@param contenttype: Optional.
@return: A dictionary of the JSON result.
"""
return self.invoke("POST", relpath, params, data,
self._make_headers(contenttype))
def put(self, relpath=None, params=None, data=None, contenttype=None):
"""
Invoke the PUT method on a resource.
@param relpath: Optional. A relative path to this resource's path.
@param params: Key-value data.
@param data: Optional. Body of the request.
@param contenttype: Optional.
@return: A dictionary of the JSON result.
"""
return self.invoke("PUT", relpath, params, data,
self._make_headers(contenttype))
def _make_headers(self, contenttype=None):
if contenttype:
return { 'Content-Type': contenttype }
return None