RETIRED, Function as a Service for OpenStack
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# Copyright 2017 Catalyst IT Limited
#
# Licensed 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
import time
import jinja2
from kubernetes import client
from oslo_log import log as logging
import requests
import yaml
from qinling import context
from qinling import exceptions as exc
from qinling.orchestrator import base
from qinling.utils import common
LOG = logging.getLogger(__name__)
TEMPLATES_DIR = (os.path.dirname(os.path.realpath(__file__)) + '/templates/')
class KubernetesManager(base.OrchestratorBase):
def __init__(self, conf):
self.conf = conf
client.Configuration().host = self.conf.kubernetes.kube_host
self.v1 = client.CoreV1Api()
self.v1extention = client.ExtensionsV1beta1Api()
# Create namespace if not exists
self._ensure_namespace()
# Get templates.
template_loader = jinja2.FileSystemLoader(
searchpath=os.path.dirname(TEMPLATES_DIR)
)
jinja_env = jinja2.Environment(
loader=template_loader, autoescape=True, trim_blocks=True,
lstrip_blocks=True
)
self.deployment_template = jinja_env.get_template('deployment.j2')
self.service_template = jinja_env.get_template('service.j2')
def _ensure_namespace(self):
ret = self.v1.list_namespace()
cur_names = [i.metadata.name for i in ret.items]
if self.conf.kubernetes.namespace not in cur_names:
LOG.info('Creating namespace: %s', self.conf.kubernetes.namespace)
namespace_body = {
'apiVersion': 'v1',
'kind': 'Namespace',
'metadata': {
'name': self.conf.kubernetes.namespace,
'labels': {
'name': self.conf.kubernetes.namespace
}
},
}
self.v1.create_namespace(namespace_body)
LOG.info('Namespace %s created.', self.conf.kubernetes.namespace)
def create_pool(self, name, image, labels=None):
deployment_body = self.deployment_template.render(
{
"name": name,
"labels": labels if labels else {},
"replicas": self.conf.kubernetes.replicas,
"container_name": 'worker',
"image": image,
}
)
LOG.info(
"Creating deployment for runtime %s: \n%s", name, deployment_body
)
self.v1extention.create_namespaced_deployment(
body=yaml.safe_load(deployment_body),
namespace=self.conf.kubernetes.namespace
)
LOG.info("Deployment for runtime %s created.", name)
def delete_pool(self, name, labels=None):
"""Delete all resources belong to the deployment."""
LOG.info("Deleting deployment %s", name)
selector = common.convert_dict_to_string(labels)
self.v1extention.delete_collection_namespaced_replica_set(
self.conf.kubernetes.namespace,
label_selector=selector
)
LOG.info("ReplicaSets in deployment %s deleted.", name)
ret = self.v1.list_namespaced_service(
self.conf.kubernetes.namespace, label_selector=selector
)
names = [i.metadata.name for i in ret.items]
for svc_name in names:
self.v1.delete_namespaced_service(
svc_name,
self.conf.kubernetes.namespace,
)
LOG.info("Services in deployment %s deleted.", name)
self.v1extention.delete_collection_namespaced_deployment(
self.conf.kubernetes.namespace,
label_selector=selector,
field_selector='metadata.name=%s' % name
)
# Should delete pods after deleting deployment to avoid pods are
# recreated by k8s.
self.v1.delete_collection_namespaced_pod(
self.conf.kubernetes.namespace,
label_selector=selector
)
LOG.info("Pods in deployment %s deleted.", name)
LOG.info("Deployment %s deleted.", name)
def _choose_available_pod(self, labels):
selector = common.convert_dict_to_string(labels)
ret = self.v1.list_namespaced_pod(
self.conf.kubernetes.namespace,
label_selector='!function_id,%s' % selector
)
if len(ret.items) == 0:
return None
# Choose the last available one by default.
pod = ret.items[-1]
return pod
def _prepare_pod(self, pod, deployment_name, function_id, service_labels):
"""Pod preparation.
1. Update pod labels.
2. Expose service and trigger package download.
"""
name = pod.metadata.name
LOG.info(
'Prepare pod %s in deployment %s for function %s',
name, deployment_name, function_id
)
# Update pod label.
pod_labels = pod.metadata.labels or {}
pod_labels.update({'function_id': function_id})
body = {
'metadata': {
'labels': pod_labels
}
}
self.v1.patch_namespaced_pod(
name, self.conf.kubernetes.namespace, body
)
LOG.debug('Labels updated for pod %s', name)
# Create service for the choosen pod.
service_name = "service-%s" % function_id
service_body = self.service_template.render(
{
"service_name": service_name,
"labels": service_labels,
"selector": pod_labels
}
)
ret = self.v1.create_namespaced_service(
self.conf.kubernetes.namespace, yaml.safe_load(service_body)
)
node_port = ret.spec.ports[0].node_port
LOG.debug(
'Service created for pod %s, service name: %s, node port: %s',
name, service_name, node_port
)
# Get external ip address for an arbitary node.
ret = self.v1.list_node()
addresses = ret.items[0].status.addresses
node_ip = None
for addr in addresses:
if addr.type == 'ExternalIP':
node_ip = addr.address
# FIXME: test purpose using minikube
if not node_ip:
for addr in addresses:
if addr.type == 'InternalIP':
node_ip = addr.address
# Download code package into container.
pod_service_url = 'http://%s:%s' % (node_ip, node_port)
request_url = '%s/download' % pod_service_url
download_url = (
'http://%s:%s/v1/functions/%s?download=true' %
(self.conf.kubernetes.qinling_service_address,
self.conf.api.port, function_id)
)
data = {
'download_url': download_url,
'function_id': function_id,
'token': context.get_ctx().auth_token
}
LOG.debug(
'Send request to pod %s, request_url: %s, data: %s',
name, request_url, data
)
# TODO(kong): Here we sleep some time to avoid 'Failed to establish a
# new connection' error for some reason. Needs to find a better
# solution.
time.sleep(1)
r = requests.post(request_url, data=data)
if r.status_code != requests.codes.ok:
raise exc.OrchestratorException(
'Failed to download function code package.'
)
return pod_service_url
def prepare_execution(self, function_id, identifier=None, labels=None):
pod = self._choose_available_pod(labels)
if not pod:
raise exc.OrchestratorException('No pod available.')
return self._prepare_pod(pod, identifier, function_id, labels)
def run_execution(self, function_id, input=None, service_url=None):
func_url = '%s/execute' % service_url
LOG.info('Invoke function %s, url: %s', function_id, func_url)
r = requests.post(func_url, data=input)
return {'result': r.json()}