5.3 KiB
Using the Client Programmatically
# Creates some vars we don't show in the docs. AUTH_URL="http://localhost:8779/v1.0/auth"
from troveclient import Dbaas from troveclient import auth class FakeAuth(auth.Authenticator):
- def authenticate(self):
- class FakeCatalog(object):
- def __init__(self, auth):
self.auth = auth
- def get_public_url(self):
- return "%s/%s" % ('http://localhost:8779/v1.0',
self.auth.tenant)
- def get_token(self):
return self.auth.tenant
return FakeCatalog(self)
from troveclient import Dbaas OLD_INIT = Dbaas.__init__ def new_init(args,kwargs): kwargs['auth_strategy'] = FakeAuth OLD_INIT(args, **kwargs)
# Monkey patch init so it'll work with fake auth. Dbaas.__init__ = new_init
- client = Dbaas("jsmith", "abcdef", tenant="12345",
-
auth_url=AUTH_URL)
client.authenticate()
# Delete all instances. instances = [1] while len(instances) > 0: instances = client.instances.list() for instance in instances: try: instance.delete() except: pass
flavor_id = "1" for i in range(30): name = "Instance #%d" % i client.instances.create(name, flavor_id, None)
Authentication
Authenticating is necessary to use every feature of the client (except to discover available versions).
To create the client, create an instance of the Dbaas (Database as a Service) class. The auth url, auth user, key, and tenant ID must be specified in the call to the constructor.
from troveclient import Dbaas global AUTH_URL
- client = Dbaas("jsmith", "abcdef", tenant="12345",
-
auth_url=AUTH_URL)
client.authenticate()
The default authentication strategy assumes a Keystone complaint auth system. For Rackspace auth, use the keyword argument "auth_strategy='rax'".
Versions
You can discover the available versions by querying the versions property as follows:
versions = client.versions.index("http://localhost:8779")
The "index" method returns a list of Version objects which have the ID as well as a list of links, each with a URL to use to reach that particular version.
- for version in versions:
-
print(version.id) for link in version.links: if link['rel'] == 'self': print(" %s" % link['href'])
Instances
The following example creates a 512 MB instance with a 1 GB volume:
client.authenticate() flavor_id = "1" volume = {'size':1} databases = [{"name": "my_db", "character_set": "latin2", # This and the next field are "collate": "latin2_general_ci"}] # optional. users = [{"name": "jsmith", "password": "12345", "databases": [{"name": "my_db"}] }] instance = client.instances.create("My Instance", flavor_id, volume, databases, users)
To retrieve the instance, use the "get" method of "instances":
updated_instance = client.instances.get(instance.id) print(updated_instance.name) print(" Status=%s Flavor=%s" % (updated_instance.status, updated_instance.flavor['id']))
- My Instance
-
Status=BUILD Flavor=1
You can delete an instance by calling "delete" on the instance object itself, or by using the delete method on "instances."
# Wait for the instance to be ready before we delete it. import time from troveclient.exceptions import NotFound
- while instance.status == "BUILD":
-
instance.get() time.sleep(1)
print("Ready in an %s state." % instance.status) instance.delete() # Delete and wait for the instance to go away. while True: try: instance = client.instances.get(instance.id) assert instance.status == "SHUTDOWN" except NotFound: break
Ready in an ACTIVE state.
Listing instances and Pagination
To list all instances, use the list method of "instances":
instances = client.instances.list()
Lists paginate after twenty items, meaning you'll only get twenty items back even if there are more. To see the next set of items, send a marker. The marker is a key value (in the case of instances, the ID) which is the non-inclusive starting point for all returned items.
The lists returned by the client always include a "next" property. This can be used as the "marker" argument to get the next section of the list back from the server. If no more items are available, then the next property is None.
# There are currently 30 instances.
instances = client.instances.list() print(len(instances)) print(instances.next is None)
instances2 = client.instances.list(marker=instances.next) print(len(instances2)) print(instances2.next is None)
20 False 10 True