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occi_api.py
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occi_api.py
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#!/usr/bin/python
#
# occi_api.py - common functions, classes, and variables for Vcycle
#
# Andrew McNab, University of Manchester.
# Luis Villazon Esteban, CERN.
# Copyright (c) 2013-5. All rights reserved.
#
# Redistribution and use in source and binary forms, with or
# without modification, are permitted provided that the following
# conditions are met:
#
# o Redistributions of source code must retain the above
# copyright notice, this list of conditions and the following
# disclaimer.
# o 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.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
# CONTRIBUTORS "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 THE COPYRIGHT OWNER 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.
#
# Contacts: [email protected] http://www.gridpp.ac.uk/vcycle/
#
import requests
import time
import base64
import vcycle.vacutils
class OcciError(Exception):
pass
ca_path = '/etc/grid-security/occi.ca-certs'
class OcciSpace(vcycle.BaseSpace):
def __init__(self, api, spaceName, parser, spaceSectionName):
# Initialize data structures from configuration files
# Generic initialization
vcycle.BaseSpace.__init__(self, api, spaceName, parser, spaceSectionName)
# OCCI-specific initialization
try:
self.tenancy_name = parser.get(spaceSectionName, 'tenancy_name')
except Exception as e:
raise OcciError('tenancy_name is required in Occi [space ' + spaceName + '] (' + str(e) + ')')
try:
self.queryURL = parser.get(spaceSectionName, 'url')
except Exception as e:
raise OcciError('url is required in Occi [space ' + spaceName + '] (' + str(e) + ')')
if self.queryURL.endswith('/'):
self.queryURL = self.queryURL[:-1]
#check if proxy is in the configuration, if not, then use the username-password
if parser.has_option(spaceSectionName, 'proxy'):
self.userkey = parser.get(spaceSectionName, 'proxy')
self.usercert = parser.get(spaceSectionName, 'proxy')
else:
#check username and password are defined
if not parser.has_option(spaceSectionName, 'username'):
raise OcciError('username is required in Occi [space %s]' % spaceName)
if not parser.has_option(spaceSectionName, 'password'):
raise OcciError('password is required in Occi [space %s]' % spaceName)
self.username = parser.get(spaceSectionName, 'username')
self.password = ''.join([ chr(ord(c)-1) for c in parser.get(spaceSectionName, 'password')])
self._create_ca_file()
def connect(self):
# Connect to the OCCI service
self.session = requests.Session()
self.session.mount(self.queryURL, requests.adapters.HTTPAdapter(pool_connections=20))
#Retrieve token
keystone_url = self._get_keystone()
if keystone_url is not None:
vcycle.vacutils.logLine("Found Keystone URL %s" % keystone_url)
self.token = self._get_token(keystone_url)
self.session.headers.clear()
self.session.headers.update({"X-Auth-Token": self.token})
self.session.cert = self.usercert
self.session.verify = ca_path
self._get_definitions()
self.computeURL = "%s/compute/" % (self.queryURL)
vcycle.vacutils.logLine("Connected to %s for space %s" % (self.queryURL ,self.spaceName))
def scanMachines(self):
"""Query OCCI compute service for details of machines in this space"""
headers = {'Accept': 'application/occi+json',
'Content-Type': 'application/occi+json'}
try:
response = self.session.get(self.computeURL)
except Exception as e:
raise OcciError('Cannot connect to ' + self.computeURL + ' (' + str(e) + ')')
for machineID in [line[line.rfind('/')+1:] for line in response.text.split("\n")[1:]]:
try:
response = self.session.get("%s/%s" % (self.computeURL, machineID), headers=headers)
except Exception as e:
raise OcciError('Cannot connect to %s/%s (%s)' %(self.computeURL, machineID, str(e)))
response = response.json()
machineName = response['attributes']['occi.compute.hostname']
occiState = response['attributes']['org.openstack.compute.state'].lower()
uuidStr = response['attributes']['occi.core.id']
try:
ip = response['links'][0]['attributes']['occi.networkinterface.address']
except:
ip = '0.0.0.0'
# Just in case other VMs are in this space
if machineName[:7] != 'vcycle-':
# Still count VMs that we didn't create and won't manage, to avoid going above space limit
self.totalMachines += 1
continue
# With OCCI will have to use our file datestamps to get transition times
try:
createdTime = int(open('/var/lib/vcycle/machines/' + machineName + '/started', 'r').read().strip())
updatedTime = int(open('/var/lib/vcycle/machines/' + machineName + '/started', 'r').read().strip())
startedTime = int(open('/var/lib/vcycle/machines/' + machineName + '/started', 'r').read().strip())
except:
createdTime = None
updatedTime = None
startedTime = None
if occiState == 'active':
state = vcycle.MachineState.running
elif occiState == 'inactive':
state = vcycle.MachineState.shutdown
else:
state = vcycle.MachineState.unknown
self.machines[machineName] = vcycle.shared.Machine(name=machineName,
spaceName=self.spaceName,
state=state,
ip=ip,
createdTime=createdTime,
startedTime=startedTime,
updatedTime=updatedTime,
uuidStr=uuidStr,
machinetypeName=None)
def createMachine(self, machineName, machinetypeName):
# OCCI-specific machine creation steps
# 'metadata' : { 'cern-services' : 'false',
# 'machinefeatures' : 'http://' + os.uname()[1] + '/' + machineName + '/machinefeatures',
# 'jobfeatures' : 'http://' + os.uname()[1] + '/' + machineName + '/jobfeatures',
# 'machineoutputs' : 'https://' + os.uname()[1] + '/' + machineName + '/machineoutputs' }
import uuid
headers = {'X-Auth-Token': self.token,
'Accept': 'text/plain,text/occi',
'Content-Type': 'text/plain,text/occi',
'Connection': 'close'
}
image = self.machinetypes[machinetypeName].root_image[6:].strip()
data = 'Category: compute;scheme="http://schemas.ogf.org/occi/infrastructure#";class="kind";location="/compute/";title="Compute Resource"\n'
data += 'Category: %s;%s;class="mixin";location="/%s"\n' % (image, self.categories[image]['scheme'], image)
data += 'Category: %s;%s;class="mixin";location="/%s"\n' % (self.machinetypes[machinetypeName].flavor_name, self.categories[self.machinetypes[machinetypeName].flavor_name]['scheme'], self.machinetypes[machinetypeName].flavor_name)
data += 'Category: user_data;"%s";class="mixin";location="%s";title="OS contextualization mixin"\n' % (self.categories['user_data']['scheme'], self.categories['user_data']['location']);
data += 'X-OCCI-Attribute: occi.core.id="%s"\n' % str(uuid.uuid4())
data += 'X-OCCI-Attribute: occi.core.title="%s"\n' % machineName
data += 'X-OCCI-Attribute: occi.compute.hostname="%s"\n' % machineName
data += 'X-OCCI-Attribute: org.openstack.compute.user_data="%s"' % base64.b64encode(open('/var/lib/vcycle/machines/' + machineName + '/user_data', 'r').read())
if self.machinetypes[machinetypeName].root_public_key:
if self.machinetypes[machinetypeName].root_public_key[0] == '/':
try:
f = open(self.machinetypes[machinetypeName].root_public_key, 'r')
except Exception as e:
OcciError('Cannot open ' + self.machinetypes[machinetypeName].root_public_key)
else:
try:
f = open('/var/lib/vcycle/' + self.spaceName + '/' + self.machinetypeName + '/' + self.machinetypes[machinetypeName].root_public_key, 'r')
except Exception as e:
OcciError('Cannot open ' + self.spaceName + '/' + self.machinetypeName + '/' + self.machinetypes[machinetypeName].root_public_key)
while True:
try:
line = f.read()
except:
raise OcciError('Cannot find ssh-rsa public key line in ' + self.machinetypes[machinetypeName].root_public_key)
if line[:8] == 'ssh-rsa ':
sshPublicKey = line.split(' ')[1]
data += 'X-OCCI-Attribute: org.openstack.credentials.publickey.data="ssh-rsa ' + sshPublicKey + ' vcycle"'
break
try:
response = self.session.post(self.computeURL, data=data, headers=headers)
if response.status_code not in [200, 201]:
raise OcciError(response.text)
except Exception as e:
raise OcciError('Cannot connect to ' + self.computeURL + ' (' + str(e) + ')')
vcycle.vacutils.logLine('Created ' + machineName + ' for ' + machinetypeName + ' within ' + self.spaceName)
self.machines[machineName] = vcycle.shared.Machine(name=machineName,
spaceName=self.spaceName,
state=vcycle.MachineState.starting,
ip='0.0.0.0',
createdTime=int(time.time()),
startedTime=int(time.time()),
updatedTime=int(time.time()),
uuidStr=None,
machinetypeName=machinetypeName)
return machineName
def deleteOneMachine(self, machineName):
"""Deletes a VM from the provider
:param machineName: vm identifier
"""
try:
self.session.delete("%s%s" % (self.computeURL, self.machines[machineName].uuidStr))
except Exception as e:
raise vcycle.shared.VcycleError('Cannot delete ' + machineName + ' via ' + self.computeURL + ' (' + str(e) + ')')
def _get_definitions(self):
"""Store the schema definitions to create VMs
"""
headers = {'X-Auth-Token': self.token,
'Accept': 'text/plain,text/occi'}
response = requests.get("%s/-/" % self.queryURL,
headers=headers,
cert=self.usercert,
verify=ca_path)
self.categories = {}
categories = response.text.split("\n")[1:]
for category in categories:
values = category.split(";")
cat = values[0][values[0].find(":")+1:].strip()
self.categories[cat] = {}
for property in values:
if property.find("scheme=") >= 0:
self.categories[cat]["scheme"] = property.strip()
if property.find("class=") >= 0:
self.categories[cat]["class"] = property.strip()
if property.find("title=") >= 0:
self.categories[cat]["title"] = property.strip()
if property.find("location=") >= 0:
aux = property.strip()
aux = aux.replace("https://","")
aux = aux.replace("http://","")
aux = aux[aux.find("/"):]
self.categories[cat]["location"] = 'location="'+aux
def _get_keystone(self):
""" Returns The authorization token to retrieve the OCCI token
:return: The keystone url
"""
try:
result = requests.head(self.queryURL + '/-/',
headers={"Content-Type": "application/json"},
cert=self.usercert,
verify=ca_path
)
except Exception as e:
raise OcciError('Cannot connect to ' + self.queryURL + ' (' + str(e) + ')')
# This is implicitly only for Keystone authentication
if result.status_code != 401 or result.headers is None:
raise OcciError('Do not recognise response when connecting to ' + self.queryURL)
if 'www-authenticate' not in result.headers:
return None
# Explicitly check for Keystone using hard-coded string index values for now
if not result.headers['www-authenticate'].startswith("Keystone uri="):
raise OcciError('Only Keystone authentication is currently supported (instead got "%s")' %
result.headers['www-authenticate'])
try:
keystoneURL = result.headers['www-authenticate'][14:-1]
keystoneURL = keystoneURL.replace("/v2.0", '')
except:
raise OcciError("Failed to find Keystone URL in %s" % result.headers['www-authenticate'])
return keystoneURL
def _get_token(self, keystone_url):
""" Returns The token to request OCCI site
:param keystone_url: URL to do the request
:return: The token
"""
if self.userkey is not None:
auth = {'auth': {'voms': True}}
else:
auth = {'auth': {
'passwordCredentials': {
'username': self.username,
'password': self.password
}
}
}
try:
result = {'response':requests.post(keystone_url+"/v2.0/tokens",
data='{"auth":{"voms": true}}',
headers={"Content-Type": "application/json"},
cert=self.usercert, verify=ca_path).json()}
except Exception as e:
raise OcciError('Cannot connect to ' + keystone_url + ' (' + str(e) + ')')
token = str(result['response']['access']['token']['id'])
tenants = self._get_tenants(keystone_url, token)
return self.__auth_in_tenant(keystone_url, token, tenants)
def _get_tenants(self, keystone_url, temporal_token):
""" Returns all the tenants available in the provider
:param token: Authorization token
:return: The name of all tenants
"""
result = {'response': requests.get("%s/v2.0/tenants/" % keystone_url,
data='{"auth":{"voms": true}}',
headers={"Content-Type": "application/json", "X-Auth-Token": temporal_token},
cert=self.usercert,
verify=ca_path).json()}
return [tenant['name'] for tenant in result['response']['tenants']]
def __auth_in_tenant(self, keystone_url, token, tenants):
""" Returns the token linked to the tenant
Loop all tenants, trying to authorize the user with each tenant, ones a tenant is valid, a token is returned
:param token: System token
:param tenants: list of tenants
:return: token and expiration date
"""
import json
for tenant in tenants:
data = {'auth': {'voms': True, 'tenantName': tenant}}
headers = {
'Accept': 'application/json',
'X-Auth-Token': token,
'User-Agent': 'Vcycle ' + vcycle.shared.vcycleVersion + ' ( OCCI/1.1 )',
'Content-Type': 'application/json',
'Content-Length': len(json.dumps(data))
}
try:
result = {'response': requests.post("%s/v2.0/tokens" % keystone_url,
data=json.dumps(data),
headers= headers,
cert=self.usercert,
verify=ca_path).json()}
except Exception as e:
print e
if 'access' in result['response']:
return result['response']['access']['token']['id']
def _create_ca_file(self):
import subprocess
import os.path
if not os.path.exists(ca_path):
subprocess.call('cat `ls /etc/grid-security/certificates/*.pem` > %s' % ca_path,
shell=True)
else:
modification_time = os.lstat(ca_path).st_mtime
for file in os.listdir('/etc/grid-security/certificates/'):
if os.lstat('/etc/grid-security/certificates/%s' % file).st_mtime > modification_time:
subprocess.call('cat `ls /etc/grid-security/certificates/*.pem` > %s' % ca_path,
shell=True)
return