author | Drew Fisher <drew.fisher@oracle.com> |
Fri, 13 Jun 2014 09:10:23 -0700 | |
branch | s11-update |
changeset 3178 | 77584387a894 |
permissions | -rw-r--r-- |
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# Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); you may |
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# not use this file except in compliance with the License. You may obtain |
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# a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
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# License for the specific language governing permissions and limitations |
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# under the License. |
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""" |
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ZFS Storage Appliance REST API Client Programmatic Interface |
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""" |
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|
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import httplib |
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import json |
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import time |
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import urllib2 |
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import StringIO |
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|
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from cinder.openstack.common import log |
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LOG = log.getLogger(__name__) |
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|
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class Status: |
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"""Result HTTP Status""" |
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def __init__(self): |
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pass |
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|
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#: Request return OK |
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OK = httplib.OK |
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|
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#: New resource created successfully |
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CREATED = httplib.CREATED |
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#: Command accepted |
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ACCEPTED = httplib.ACCEPTED |
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|
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#: Command returned OK but no data will be returned |
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NO_CONTENT = httplib.NO_CONTENT |
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|
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#: Bad Request |
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BAD_REQUEST = httplib.BAD_REQUEST |
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|
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#: User is not authorized |
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UNAUTHORIZED = httplib.UNAUTHORIZED |
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#: The request is not allowed |
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FORBIDDEN = httplib.FORBIDDEN |
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|
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#: The requested resource was not found |
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NOT_FOUND = httplib.NOT_FOUND |
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|
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#: The request is not allowed |
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NOT_ALLOWED = httplib.METHOD_NOT_ALLOWED |
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#: Request timed out |
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TIMEOUT = httplib.REQUEST_TIMEOUT |
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#: Invalid request |
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CONFLICT = httplib.CONFLICT |
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#: Service Unavailable |
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BUSY = httplib.SERVICE_UNAVAILABLE |
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class RestResult(object): |
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"""Result from a REST API operation""" |
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def __init__(self, response=None, err=None): |
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"""Initialize a RestResult containing the results from a REST call |
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:param response: HTTP response |
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""" |
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self.response = response |
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self.error = err |
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self.data = "" |
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self.status = 0 |
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if self.response is not None: |
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self.status = self.response.getcode() |
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result = self.response.read() |
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while result: |
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self.data += result |
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result = self.response.read() |
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if self.error is not None: |
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self.status = self.error.code |
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self.data = httplib.responses[self.status] |
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LOG.debug('response code: %s' % self.status) |
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LOG.debug('response data: %s' % self.data) |
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def get_header(self, name): |
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"""Get an HTTP header with the given name from the results |
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:param name: HTTP header name |
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:return: The header value or None if no value is found |
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""" |
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if self.response is None: |
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return None |
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info = self.response.info() |
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return info.getheader(name) |
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class RestClientError(Exception): |
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"""Exception for ZFS REST API client errors""" |
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def __init__(self, status, name="ERR_INTERNAL", message=None): |
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"""Create a REST Response exception |
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:param status: HTTP response status |
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:param name: The name of the REST API error type |
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:param message: Descriptive error message returned from REST call |
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""" |
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Exception.__init__(self, message) |
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self.code = status |
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self.name = name |
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self.msg = message |
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if status in httplib.responses: |
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self.msg = httplib.responses[status] |
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|
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125 |
def __str__(self): |
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return "%d %s %s" % (self.code, self.name, self.msg) |
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127 |
|
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128 |
|
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129 |
class RestClientURL(object): |
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"""ZFSSA urllib2 client""" |
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def __init__(self, url, **kwargs): |
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132 |
""" |
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Initialize a REST client. |
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134 |
|
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:param url: The ZFSSA REST API URL |
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:key session: HTTP Cookie value of x-auth-session obtained from a |
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normal BUI login. |
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138 |
:key timeout: Time in seconds to wait for command to complete. |
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(Default is 60 seconds) |
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140 |
""" |
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141 |
self.url = url |
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142 |
self.local = kwargs.get("local", False) |
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self.base_path = kwargs.get("base_path", "/api") |
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144 |
self.timeout = kwargs.get("timeout", 60) |
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145 |
self.headers = None |
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146 |
if kwargs.get('session'): |
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self.headers['x-auth-session'] = kwargs.get('session') |
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148 |
|
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149 |
self.headers = {"content-type": "application/json"} |
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self.do_logout = False |
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151 |
self.auth_str = None |
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152 |
|
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153 |
def _path(self, path, base_path=None): |
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"""build rest url path""" |
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if path.startswith("http://") or path.startswith("https://"): |
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156 |
return path |
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157 |
if base_path is None: |
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158 |
base_path = self.base_path |
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if not path.startswith(base_path) and not ( |
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160 |
self.local and ("/api" + path).startswith(base_path)): |
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path = "%s%s" % (base_path, path) |
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162 |
if self.local and path.startswith("/api"): |
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163 |
path = path[4:] |
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164 |
return self.url + path |
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165 |
|
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166 |
def authorize(self): |
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167 |
"""Performs authorization setting x-auth-session""" |
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self.headers['authorization'] = 'Basic %s' % self.auth_str |
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169 |
if 'x-auth-session' in self.headers: |
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170 |
del self.headers['x-auth-session'] |
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171 |
|
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172 |
try: |
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173 |
result = self.post("/access/v1") |
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174 |
del self.headers['authorization'] |
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175 |
if result.status == httplib.CREATED: |
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176 |
self.headers['x-auth-session'] = \ |
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177 |
result.get_header('x-auth-session') |
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178 |
self.do_logout = True |
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179 |
LOG.info('ZFSSA version: %s' % |
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180 |
result.get_header('x-zfssa-version')) |
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181 |
|
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182 |
elif result.status == httplib.NOT_FOUND: |
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183 |
raise RestClientError(result.status, name="ERR_RESTError", |
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184 |
message="REST Not Available: \ |
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185 |
Please Upgrade") |
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186 |
|
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187 |
except RestClientError as err: |
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188 |
del self.headers['authorization'] |
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189 |
raise err |
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190 |
|
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191 |
def login(self, auth_str): |
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192 |
""" |
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193 |
Login to an appliance using a user name and password and start |
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194 |
a session like what is done logging into the BUI. This is not a |
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195 |
requirement to run REST commands, since the protocol is stateless. |
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196 |
What is does is set up a cookie session so that some server side |
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197 |
caching can be done. If login is used remember to call logout when |
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198 |
finished. |
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199 |
|
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200 |
:param auth_str: Authorization string (base64) |
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201 |
""" |
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202 |
self.auth_str = auth_str |
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203 |
self.authorize() |
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204 |
|
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205 |
def logout(self): |
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206 |
"""Logout of an appliance""" |
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207 |
result = None |
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208 |
try: |
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209 |
result = self.delete("/access/v1", base_path="/api") |
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|
210 |
except RestClientError: |
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211 |
pass |
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212 |
|
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213 |
self.headers.clear() |
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214 |
self.do_logout = False |
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215 |
return result |
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216 |
|
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217 |
def islogin(self): |
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218 |
"""return if client is login""" |
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219 |
return self.do_logout |
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220 |
|
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221 |
@staticmethod |
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222 |
def mkpath(*args, **kwargs): |
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223 |
"""Make a path?query string for making a REST request |
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224 |
|
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225 |
:cmd_params args: The path part |
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226 |
:cmd_params kwargs: The query part |
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227 |
""" |
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228 |
buf = StringIO() |
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229 |
query = "?" |
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230 |
for arg in args: |
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|
231 |
buf.write("/") |
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232 |
buf.write(arg) |
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233 |
for k in kwargs: |
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234 |
buf.write(query) |
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235 |
if query == "?": |
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236 |
query = "&" |
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237 |
buf.write(k) |
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238 |
buf.write("=") |
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239 |
buf.write(kwargs[k]) |
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240 |
return buf.getvalue() |
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241 |
|
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242 |
def request(self, path, request, body=None, **kwargs): |
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243 |
"""Make an HTTP request and return the results |
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244 |
|
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245 |
:param path: Path used with the initiazed URL to make a request |
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246 |
:param request: HTTP request type (GET, POST, PUT, DELETE) |
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|
247 |
:param body: HTTP body of request |
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248 |
:key accept: Set HTTP 'Accept' header with this value |
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249 |
:key base_path: Override the base_path for this request |
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250 |
:key content: Set HTTP 'Content-Type' header with this value |
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|
251 |
""" |
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252 |
out_hdrs = dict.copy(self.headers) |
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|
253 |
if kwargs.get("accept"): |
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254 |
out_hdrs['accept'] = kwargs.get("accept") |
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|
255 |
|
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256 |
if body is not None: |
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|
257 |
if isinstance(body, dict): |
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|
258 |
body = str(json.dumps(body)) |
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|
259 |
|
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|
260 |
if body and len(body): |
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|
261 |
out_hdrs['content-length'] = len(body) |
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|
262 |
|
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|
263 |
zfssaurl = self._path(path, kwargs.get("base_path")) |
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|
264 |
req = urllib2.Request(zfssaurl, body, out_hdrs) |
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|
265 |
req.get_method = lambda: request |
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|
266 |
maxreqretries = kwargs.get("maxreqretries", 10) |
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|
267 |
retry = 0 |
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|
268 |
response = None |
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|
269 |
|
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|
270 |
LOG.debug('request: %s %s' % (request, zfssaurl)) |
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|
271 |
LOG.debug('out headers: %s' % out_hdrs) |
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|
272 |
if body is not None and body != '': |
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|
273 |
LOG.debug('body: %s' % body) |
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|
274 |
|
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|
275 |
while retry < maxreqretries: |
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|
276 |
try: |
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|
277 |
response = urllib2.urlopen(req, timeout=self.timeout) |
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|
278 |
except urllib2.HTTPError as err: |
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|
279 |
LOG.error('REST Not Available: %s' % err.code) |
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|
280 |
if err.code == httplib.SERVICE_UNAVAILABLE and \ |
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parents:
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|
281 |
retry < maxreqretries: |
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|
282 |
retry += 1 |
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parents:
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|
283 |
time.sleep(1) |
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|
284 |
LOG.error('Server Busy retry request: %s' % retry) |
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parents:
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changeset
|
285 |
continue |
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parents:
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|
286 |
if (err.code == httplib.UNAUTHORIZED or |
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|
287 |
err.code == httplib.INTERNAL_SERVER_ERROR) and \ |
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parents:
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|
288 |
'/access/v1' not in zfssaurl: |
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parents:
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changeset
|
289 |
try: |
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parents:
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changeset
|
290 |
LOG.error('Authorizing request retry: %s, %s' % |
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parents:
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|
291 |
(zfssaurl, retry)) |
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parents:
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|
292 |
self.authorize() |
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parents:
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|
293 |
req.add_header('x-auth-session', |
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parents:
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|
294 |
self.headers['x-auth-session']) |
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parents:
diff
changeset
|
295 |
except RestClientError: |
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parents:
diff
changeset
|
296 |
pass |
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parents:
diff
changeset
|
297 |
retry += 1 |
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parents:
diff
changeset
|
298 |
time.sleep(1) |
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parents:
diff
changeset
|
299 |
continue |
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parents:
diff
changeset
|
300 |
|
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parents:
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changeset
|
301 |
return RestResult(err=err) |
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parents:
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changeset
|
302 |
|
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parents:
diff
changeset
|
303 |
except urllib2.URLError as err: |
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parents:
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changeset
|
304 |
LOG.error('URLError: %s' % err.reason) |
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parents:
diff
changeset
|
305 |
raise RestClientError(-1, name="ERR_URLError", |
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parents:
diff
changeset
|
306 |
message=err.reason) |
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parents:
diff
changeset
|
307 |
|
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parents:
diff
changeset
|
308 |
break |
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parents:
diff
changeset
|
309 |
|
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parents:
diff
changeset
|
310 |
if response and response.getcode() == httplib.SERVICE_UNAVAILABLE and \ |
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parents:
diff
changeset
|
311 |
retry >= maxreqretries: |
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parents:
diff
changeset
|
312 |
raise RestClientError(response.getcode(), name="ERR_HTTPError", |
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parents:
diff
changeset
|
313 |
message="REST Not Available: Disabled") |
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parents:
diff
changeset
|
314 |
|
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parents:
diff
changeset
|
315 |
return RestResult(response=response) |
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parents:
diff
changeset
|
316 |
|
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parents:
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changeset
|
317 |
def get(self, path, **kwargs): |
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parents:
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changeset
|
318 |
""" |
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parents:
diff
changeset
|
319 |
Make an HTTP GET request |
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Drew Fisher <drew.fisher@oracle.com>
parents:
diff
changeset
|
320 |
|
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parents:
diff
changeset
|
321 |
:param path: Path to resource. |
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parents:
diff
changeset
|
322 |
""" |
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parents:
diff
changeset
|
323 |
return self.request(path, "GET", **kwargs) |
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parents:
diff
changeset
|
324 |
|
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parents:
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changeset
|
325 |
def post(self, path, body="", **kwargs): |
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parents:
diff
changeset
|
326 |
"""Make an HTTP POST request |
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parents:
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changeset
|
327 |
|
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parents:
diff
changeset
|
328 |
:param path: Path to resource. |
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parents:
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changeset
|
329 |
:param body: Post data content |
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parents:
diff
changeset
|
330 |
""" |
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parents:
diff
changeset
|
331 |
return self.request(path, "POST", body, **kwargs) |
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parents:
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changeset
|
332 |
|
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parents:
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changeset
|
333 |
def put(self, path, body="", **kwargs): |
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parents:
diff
changeset
|
334 |
"""Make an HTTP PUT request |
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parents:
diff
changeset
|
335 |
|
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parents:
diff
changeset
|
336 |
:param path: Path to resource. |
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parents:
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changeset
|
337 |
:param body: Put data content |
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parents:
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changeset
|
338 |
""" |
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parents:
diff
changeset
|
339 |
return self.request(path, "PUT", body, **kwargs) |
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parents:
diff
changeset
|
340 |
|
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parents:
diff
changeset
|
341 |
def delete(self, path, **kwargs): |
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parents:
diff
changeset
|
342 |
"""Make an HTTP DELETE request |
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parents:
diff
changeset
|
343 |
|
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parents:
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changeset
|
344 |
:param path: Path to resource that will be deleted. |
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parents:
diff
changeset
|
345 |
""" |
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parents:
diff
changeset
|
346 |
return self.request(path, "DELETE", **kwargs) |
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parents:
diff
changeset
|
347 |
|
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parents:
diff
changeset
|
348 |
def head(self, path, **kwargs): |
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parents:
diff
changeset
|
349 |
"""Make an HTTP HEAD request |
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parents:
diff
changeset
|
350 |
|
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parents:
diff
changeset
|
351 |
:param path: Path to resource. |
77584387a894
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Drew Fisher <drew.fisher@oracle.com>
parents:
diff
changeset
|
352 |
""" |
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parents:
diff
changeset
|
353 |
return self.request(path, "HEAD", **kwargs) |