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import os
import six
import hashlib
import tempfile
from collections import defaultdict
from urllib3.exceptions import ProtocolError, MaxRetryError
from kubernetes.dynamic.discovery import Discoverer as K8sDiscoverer
from kubernetes.dynamic.discovery import LazyDiscoverer as K8sLazyDiscoverer
from kubernetes.dynamic.discovery import LazyDiscoverer as K8sEagerDiscoverer
from kubernetes.dynamic.discovery import ( # noqa
CacheEncoder,
CacheDecoder,
DISCOVERY_PREFIX,
ResourceGroup,
)
from kubernetes.dynamic.exceptions import (
ApiException,
ResourceNotFoundError,
ResourceNotUniqueError,
ServiceUnavailableError,
)
from .resource import Resource, ResourceList
class Discoverer(K8sDiscoverer):
"""
A convenient container for storing discovered API resources. Allows
easy searching and retrieval of specific resources.
Subclasses implement the abstract methods with different loading strategies.
"""
def __init__(self, client, cache_file):
self.client = client
default_cachefile_name = 'osrcp-{0}.json'.format(hashlib.sha1(self.__get_default_cache_id()).hexdigest())
self.__cache_file = cache_file or os.path.join(tempfile.gettempdir(), default_cachefile_name)
self.__init_cache()
def __get_default_cache_id(self):
user = self.__get_user()
if user:
cache_id = "{0}-{1}".format(self.client.configuration.host, user)
else:
cache_id = self.client.configuration.host
if six.PY3:
return cache_id.encode('utf-8')
return cache_id
def __get_user(self):
if hasattr(os, 'getlogin'):
try:
user = os.getlogin()
if user:
return str(user)
except OSError:
pass
if hasattr(os, 'getuid'):
try:
user = os.getuid()
if user:
return str(user)
except OSError:
pass
user = os.environ.get("USERNAME")
if user:
return str(user)
return None
def default_groups(self, request_resources=False):
groups = {}
groups['api'] = { '': {
'v1': (ResourceGroup( True, resources=self.get_resources_for_api_version('api', '', 'v1', True) )
if request_resources else ResourceGroup(True))
}}
if self.version.get('openshift'):
groups['oapi'] = { '': {
'v1': (ResourceGroup( True, resources=self.get_resources_for_api_version('oapi', '', 'v1', True) )
if request_resources else ResourceGroup(True))
}}
groups[DISCOVERY_PREFIX] = {'': {
'v1': ResourceGroup(True, resources = {"List": [ResourceList(self.client)]})
}}
return groups
def _load_server_info(self):
def just_json(_, serialized):
return serialized
if not self._cache.get('version'):
try:
self._cache['version'] = {
'kubernetes': self.client.request('get', '/version', serializer=just_json)
}
except (ValueError, MaxRetryError) as e:
if isinstance(e, MaxRetryError) and not isinstance(e.reason, ProtocolError):
raise
if not self.client.configuration.host.startswith("https://"):
raise ValueError("Host value %s should start with https:// when talking to HTTPS endpoint" %
self.client.configuration.host)
else:
raise
try:
self._cache['version']['openshift'] = self.client.request(
'get',
'/version/openshift',
serializer=just_json,
)
except ApiException:
pass
self.__version = self._cache['version']
def get_resources_for_api_version(self, prefix, group, version, preferred):
""" returns a dictionary of resources associated with provided (prefix, group, version)"""
resources = defaultdict(list)
subresources = {}
path = '/'.join(filter(None, [prefix, group, version]))
try:
resources_response = self.client.request('GET', path).resources or []
except ServiceUnavailableError:
resources_response = []
resources_raw = list(filter(lambda resource: '/' not in resource['name'], resources_response))
subresources_raw = list(filter(lambda resource: '/' in resource['name'], resources_response))
for subresource in subresources_raw:
resource, name = subresource['name'].split('/', 1)
if not subresources.get(resource):
subresources[resource] = {}
subresources[resource][name] = subresource
for resource in resources_raw:
# Prevent duplicate keys
for key in ('prefix', 'group', 'api_version', 'client', 'preferred'):
resource.pop(key, None)
resourceobj = Resource(
prefix=prefix,
group=group,
api_version=version,
client=self.client,
preferred=preferred,
subresources=subresources.get(resource['name']),
**resource
)
resources[resource['kind']].append(resourceobj)
resource_lookup = {
'prefix': prefix,
'group': group,
'api_version': version,
'kind': resourceobj.kind,
'name': resourceobj.name
}
resource_list = ResourceList(self.client, group=group, api_version=version, base_kind=resource['kind'], base_resource_lookup=resource_lookup)
resources[resource_list.kind].append(resource_list)
return resources
def get(self, **kwargs):
""" Same as search, but will throw an error if there are multiple or no
results. If there are multiple results and only one is an exact match
on api_version, that resource will be returned.
"""
results = self.search(**kwargs)
# If there are multiple matches, prefer exact matches on api_version
if len(results) > 1 and kwargs.get('api_version'):
results = [
result for result in results if result.group_version == kwargs['api_version']
]
# If there are multiple matches, prefer non-List kinds
if len(results) > 1 and not all([isinstance(x, ResourceList) for x in results]):
results = [result for result in results if not isinstance(result, ResourceList)]
# if multiple resources are found that share a GVK, prefer the one with the most supported verbs
if len(results) > 1 and len(set((x.group_version, x.kind) for x in results)) == 1:
if len(set(len(x.verbs) for x in results)) != 1:
results = [max(results, key=lambda x: len(x.verbs))]
if len(results) == 1:
return results[0]
elif not results:
raise ResourceNotFoundError('No matches found for {}'.format(kwargs))
else:
raise ResourceNotUniqueError('Multiple matches found for {}: {}'.format(kwargs, results))
class LazyDiscoverer(K8sLazyDiscoverer, Discoverer):
""" A convenient container for storing discovered API resources. Allows
easy searching and retrieval of specific resources.
Resources for the cluster are loaded lazily.
"""
class EagerDiscoverer(K8sEagerDiscoverer, Discoverer):
""" A convenient container for storing discovered API resources. Allows
easy searching and retrieval of specific resources.
All resources are discovered for the cluster upon object instantiation.
"""
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