528 lines
18 KiB
Python
528 lines
18 KiB
Python
# 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 copy
|
|
import json
|
|
import os
|
|
import time
|
|
|
|
import jinja2
|
|
from kubernetes.client import V1DeleteOptions
|
|
from oslo_log import log as logging
|
|
import requests
|
|
import tenacity
|
|
import yaml
|
|
|
|
from qinling.engine import utils
|
|
from qinling import exceptions as exc
|
|
from qinling.orchestrator import base
|
|
from qinling.orchestrator.kubernetes import utils as k8s_util
|
|
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, qinling_endpoint):
|
|
self.conf = conf
|
|
self.qinling_endpoint = qinling_endpoint
|
|
|
|
clients = k8s_util.get_k8s_clients(self.conf)
|
|
self.v1 = clients['v1']
|
|
self.v1extension = clients['v1extension']
|
|
# self.apps_v1 = clients['apps_v1']
|
|
|
|
# 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')
|
|
self.pod_template = jinja_env.get_template('pod.j2')
|
|
|
|
# Refer to
|
|
# http://docs.python-requests.org/en/master/user/advanced/#session-objects
|
|
self.session = requests.Session()
|
|
|
|
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)
|
|
|
|
@tenacity.retry(
|
|
wait=tenacity.wait_fixed(2),
|
|
stop=tenacity.stop_after_delay(600),
|
|
retry=tenacity.retry_if_result(lambda result: not result)
|
|
)
|
|
def _wait_deployment_available(self, name):
|
|
ret = self.v1extension.read_namespaced_deployment(
|
|
name,
|
|
self.conf.kubernetes.namespace
|
|
)
|
|
|
|
if not ret.status.replicas:
|
|
return False
|
|
|
|
return ret.status.replicas == ret.status.available_replicas
|
|
|
|
def create_pool(self, name, image):
|
|
deployment_body = self.deployment_template.render(
|
|
{
|
|
"name": name,
|
|
"labels": {'runtime_id': name},
|
|
"replicas": self.conf.kubernetes.replicas,
|
|
"container_name": 'worker',
|
|
"image": image,
|
|
"sidecar_image": self.conf.engine.sidecar_image
|
|
}
|
|
)
|
|
|
|
LOG.info(
|
|
"Creating deployment for runtime %s: \n%s", name, deployment_body
|
|
)
|
|
|
|
self.v1extension.create_namespaced_deployment(
|
|
body=yaml.safe_load(deployment_body),
|
|
namespace=self.conf.kubernetes.namespace
|
|
)
|
|
|
|
self._wait_deployment_available(name)
|
|
|
|
LOG.info("Deployment for runtime %s created.", name)
|
|
|
|
def delete_pool(self, name):
|
|
"""Delete all resources belong to the deployment."""
|
|
LOG.info("Deleting deployment %s", name)
|
|
|
|
labels = {'runtime_id': name}
|
|
selector = common.convert_dict_to_string(labels)
|
|
|
|
self.v1extension.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,
|
|
V1DeleteOptions(),
|
|
)
|
|
LOG.info("Services in deployment %s deleted.", name)
|
|
|
|
self.v1extension.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 update_pool(self, name, image=None):
|
|
"""Deployment rolling-update.
|
|
|
|
Return True if successful, otherwise return False after rolling back.
|
|
"""
|
|
LOG.info('Start to do rolling-update deployment %s', name)
|
|
|
|
body = {
|
|
'spec': {
|
|
'template': {
|
|
'spec': {
|
|
'containers': [
|
|
{
|
|
# TODO(kong): Make the name configurable.
|
|
'name': 'worker',
|
|
'image': image
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
self.v1extension.patch_namespaced_deployment(
|
|
name, self.conf.kubernetes.namespace, body
|
|
)
|
|
|
|
unavailable_replicas = 1
|
|
# TODO(kong): Make this configurable
|
|
retry = 5
|
|
while unavailable_replicas != 0 and retry > 0:
|
|
time.sleep(5)
|
|
retry = retry - 1
|
|
|
|
deploy = self.v1extension.read_namespaced_deployment_status(
|
|
name,
|
|
self.conf.kubernetes.namespace
|
|
)
|
|
unavailable_replicas = deploy.status.unavailable_replicas
|
|
|
|
# Handle failure of rolling-update.
|
|
if unavailable_replicas > 0:
|
|
body = {
|
|
"name": name,
|
|
"rollbackTo": {
|
|
"revision": 0
|
|
}
|
|
}
|
|
self.v1extension.create_namespaced_deployment_rollback(
|
|
name, self.conf.kubernetes.namespace, body
|
|
)
|
|
|
|
return False
|
|
|
|
return True
|
|
|
|
def _choose_available_pods(self, labels, count=1, function_id=None,
|
|
function_version=0):
|
|
# If there is already a pod for function, reuse it.
|
|
if function_id:
|
|
ret = self.v1.list_namespaced_pod(
|
|
self.conf.kubernetes.namespace,
|
|
label_selector='function_id=%s,function_version=%s' %
|
|
(function_id, function_version)
|
|
)
|
|
if len(ret.items) >= count:
|
|
LOG.debug(
|
|
"Function %s(version %s) already associates to a pod with "
|
|
"at least %d worker(s). ",
|
|
function_id, function_version, count
|
|
)
|
|
return ret.items[:count]
|
|
|
|
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) < count:
|
|
return []
|
|
|
|
return ret.items[-count:]
|
|
|
|
def _prepare_pod(self, pod, deployment_name, function_id, version,
|
|
labels=None):
|
|
"""Pod preparation.
|
|
|
|
1. Update pod labels.
|
|
2. Expose service.
|
|
"""
|
|
pod_name = pod.metadata.name
|
|
labels = labels or {}
|
|
|
|
LOG.info(
|
|
'Prepare pod %s in deployment %s for function %s(version %s)',
|
|
pod_name, deployment_name, function_id, version
|
|
)
|
|
|
|
# Update pod label.
|
|
pod_labels = self._update_pod_label(
|
|
pod,
|
|
# pod label value should be string
|
|
{'function_id': function_id, 'function_version': str(version)}
|
|
)
|
|
|
|
# Create service for the chosen pod.
|
|
service_name = "service-%s-%s" % (function_id, version)
|
|
labels.update(
|
|
{'function_id': function_id, 'function_version': str(version)}
|
|
)
|
|
|
|
# TODO(kong): Make the service type configurable.
|
|
service_body = self.service_template.render(
|
|
{
|
|
"service_name": service_name,
|
|
"labels": labels,
|
|
"selector": pod_labels
|
|
}
|
|
)
|
|
try:
|
|
ret = self.v1.create_namespaced_service(
|
|
self.conf.kubernetes.namespace, yaml.safe_load(service_body)
|
|
)
|
|
LOG.debug(
|
|
'Service created for pod %s, service name: %s',
|
|
pod_name, service_name
|
|
)
|
|
except Exception as e:
|
|
# Service already exists
|
|
if e.status == 409:
|
|
LOG.debug(
|
|
'Service already exists for pod %s, service name: %s',
|
|
pod_name, service_name
|
|
)
|
|
time.sleep(1)
|
|
ret = self.v1.read_namespaced_service(
|
|
service_name, self.conf.kubernetes.namespace
|
|
)
|
|
else:
|
|
raise
|
|
|
|
# Get external ip address for an arbitrary node.
|
|
node_port = ret.spec.ports[0].node_port
|
|
nodes = self.v1.list_node()
|
|
addresses = nodes.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
|
|
|
|
pod_service_url = 'http://%s:%s' % (node_ip, node_port)
|
|
|
|
return pod_name, pod_service_url
|
|
|
|
def _create_pod(self, image, rlimit, pod_name, labels, input):
|
|
"""Create pod for image type function."""
|
|
if not input:
|
|
input_list = []
|
|
elif isinstance(input, dict) and input.get('__function_input'):
|
|
input_list = input.get('__function_input').split()
|
|
else:
|
|
input_list = list(json.loads(input))
|
|
|
|
pod_body = self.pod_template.render(
|
|
{
|
|
"pod_name": pod_name,
|
|
"labels": labels,
|
|
"pod_image": image,
|
|
"input": input_list,
|
|
"req_cpu": str(rlimit['cpu']),
|
|
"limit_cpu": str(rlimit['cpu']),
|
|
"req_memory": str(rlimit['memory_size']),
|
|
"limit_memory": str(rlimit['memory_size'])
|
|
}
|
|
)
|
|
|
|
LOG.info(
|
|
"Creating pod %s for image function:\n%s", pod_name, pod_body
|
|
)
|
|
|
|
self.v1.create_namespaced_pod(
|
|
self.conf.kubernetes.namespace,
|
|
body=yaml.safe_load(pod_body),
|
|
)
|
|
|
|
def _update_pod_label(self, pod, new_label):
|
|
name = pod.metadata.name
|
|
|
|
pod_labels = copy.deepcopy(pod.metadata.labels) or {}
|
|
pod_labels.update(new_label)
|
|
body = {
|
|
'metadata': {
|
|
'labels': pod_labels
|
|
}
|
|
}
|
|
self.v1.patch_namespaced_pod(
|
|
name, self.conf.kubernetes.namespace, body
|
|
)
|
|
|
|
LOG.debug('Labels updated for pod %s', name)
|
|
|
|
return pod_labels
|
|
|
|
def prepare_execution(self, function_id, version, rlimit=None, image=None,
|
|
identifier=None, labels=None, input=None):
|
|
"""Prepare service URL for function version.
|
|
|
|
:param rlimit: optional argument passed to limit cpu/mem resources.
|
|
|
|
For image function, create a single pod with rlimit and input, so the
|
|
function will be executed in the resource limited pod.
|
|
|
|
For normal function, choose a pod from the pool and expose a service,
|
|
return the service URL.
|
|
|
|
return a tuple includes pod name and the servise url.
|
|
"""
|
|
pods = None
|
|
|
|
labels = labels or {'function_id': function_id}
|
|
|
|
if image:
|
|
if not rlimit:
|
|
LOG.critical('Param rlimit is required for image function.')
|
|
raise exc.OrchestratorException(
|
|
'Execution preparation failed.'
|
|
)
|
|
|
|
self._create_pod(image, rlimit, identifier, labels, input)
|
|
return identifier, None
|
|
else:
|
|
pods = self._choose_available_pods(labels, function_id=function_id,
|
|
function_version=version)
|
|
|
|
if not pods:
|
|
LOG.critical('No worker available.')
|
|
raise exc.OrchestratorException('Execution preparation failed.')
|
|
|
|
try:
|
|
pod_name, url = self._prepare_pod(
|
|
pods[0], identifier, function_id, version, labels
|
|
)
|
|
return pod_name, url
|
|
except Exception:
|
|
LOG.exception('Pod preparation failed.')
|
|
self.delete_function(function_id, version, labels)
|
|
raise exc.OrchestratorException('Execution preparation failed.')
|
|
|
|
def run_execution(self, execution_id, function_id, version, rlimit=None,
|
|
input=None, identifier=None, service_url=None,
|
|
entry='main.main', trust_id=None):
|
|
"""Run execution.
|
|
|
|
Return a tuple including the result and the output.
|
|
"""
|
|
if service_url:
|
|
func_url = '%s/execute' % service_url
|
|
data = utils.get_request_data(
|
|
self.conf, function_id, version, execution_id, rlimit, input,
|
|
entry, trust_id, self.qinling_endpoint
|
|
)
|
|
LOG.debug(
|
|
'Invoke function %s(version %s), url: %s, data: %s',
|
|
function_id, version, func_url, data
|
|
)
|
|
|
|
return utils.url_request(self.session, func_url, body=data)
|
|
else:
|
|
# Wait for image type function execution to be finished
|
|
def _wait_complete():
|
|
pod = self.v1.read_namespaced_pod(
|
|
identifier,
|
|
self.conf.kubernetes.namespace
|
|
)
|
|
status = pod.status.phase
|
|
return True if status == 'Succeeded' else False
|
|
|
|
try:
|
|
r = tenacity.Retrying(
|
|
wait=tenacity.wait_fixed(1),
|
|
stop=tenacity.stop_after_delay(180),
|
|
retry=tenacity.retry_if_result(
|
|
lambda result: result is False)
|
|
)
|
|
r.call(_wait_complete)
|
|
except Exception as e:
|
|
LOG.exception(
|
|
"Failed to get pod output, pod: %s, error: %s",
|
|
identifier, str(e)
|
|
)
|
|
return False, {'error': 'Function execution failed.'}
|
|
|
|
output = self.v1.read_namespaced_pod_log(
|
|
identifier,
|
|
self.conf.kubernetes.namespace,
|
|
)
|
|
return True, output
|
|
|
|
def delete_function(self, function_id, version, labels=None):
|
|
"""Delete related resources for function.
|
|
|
|
- Delete service
|
|
- Delete pods
|
|
"""
|
|
pre_label = {
|
|
'function_id': function_id,
|
|
'function_version': str(version)
|
|
}
|
|
labels = labels or pre_label
|
|
selector = common.convert_dict_to_string(labels)
|
|
|
|
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,
|
|
V1DeleteOptions(),
|
|
)
|
|
|
|
self.v1.delete_collection_namespaced_pod(
|
|
self.conf.kubernetes.namespace,
|
|
label_selector=selector
|
|
)
|
|
|
|
def scaleup_function(self, function_id, version, identifier=None, count=1):
|
|
pod_names = []
|
|
labels = {'runtime_id': identifier}
|
|
pods = self._choose_available_pods(labels, count=count)
|
|
|
|
if not pods:
|
|
raise exc.OrchestratorException('Not enough workers available.')
|
|
|
|
for pod in pods:
|
|
pod_name, service_url = self._prepare_pod(
|
|
pod, identifier, function_id, version, labels
|
|
)
|
|
pod_names.append(pod_name)
|
|
|
|
LOG.info('Pods scaled up for function %s(version %s): %s', function_id,
|
|
version, pod_names)
|
|
|
|
return pod_names, service_url
|
|
|
|
def delete_worker(self, pod_name, **kwargs):
|
|
self.v1.delete_namespaced_pod(
|
|
pod_name,
|
|
self.conf.kubernetes.namespace,
|
|
{}
|
|
)
|