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kube_monitor.py
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kube_monitor.py
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#
# Copyright (c) 2017 Juniper Networks, Inc. All rights reserved.
#
import sys
import os
import time
import socket
import select
import eventlet
import json
import requests
class KubeMonitor(object):
def __init__(self, args=None, logger=None, q=None, db=None,
resource_name='KubeMonitor', beta=False):
self.name = type(self).__name__
self.args = args
self.logger = logger
self.q = q
self.cloud_orchestrator = self.args.orchestrator
self.token = self.args.token # valid only for OpenShift
self.headers = {'Connection': 'Keep-Alive'}
self.verify = False
self.timeout = 60
# Per-monitor stream handle to api server.
self.kube_api_resp = None
self.kube_api_stream_handle = None
# Resource name corresponding to this monitor.
self.resource_name = resource_name
self.resource_beta = beta
# Use Kube DB if kube object caching is enabled in config.
if args.kube_object_cache == 'True':
self.db = db
else:
self.db = None
if self.cloud_orchestrator == "openshift":
protocol = "https"
header = {'Authorization': "Bearer " + self.token}
self.headers.update(header)
self.verify = False
else: # kubernetes
protocol = "http"
# URL to the api server.
self.url = "%s://%s:%s" % (protocol,
self.args.kubernetes_api_server,
self.args.kubernetes_api_port)
# URL to the v1-components in api server.
self.v1_url = "%s/api/v1" % (self.url)
# URL to v1-beta1 components to api server.
self.beta_url = "%s/apis/extensions/v1beta1" % (self.url)
if not self._is_kube_api_server_alive():
msg = "kube_api_service is not available"
self.logger.error("%s - %s" %(self.name, msg))
raise Exception(msg)
self.logger.info("%s - KubeMonitor init done." %self.name)
def _is_kube_api_server_alive(self):
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
result = sock.connect_ex((self.args.kubernetes_api_server, \
self.args.kubernetes_api_port))
if result == 0:
return True
else:
return False
def _get_component_url(self):
"""URL to a component.
This method return the URL for the component represented by this
monitor instance.
"""
if self.resource_beta == False:
base_url = self.v1_url
else:
base_url = self.beta_url
url = "%s/%s" % (base_url, self.resource_name)
return url
def get_entry_url(self, base_url, entry):
"""URL to an entry of this component.
This method returns a URL to a specific entry of this component.
"""
return base_url + entry['metadata']['selfLink']
def init_monitor(self):
"""Initialize/sync a monitor component.
This method will initialize a monitor component.
As a part of this init, this method will read existing entries in api
server and populate the local db.
"""
# Get the URL to this component.
url = self._get_component_url()
try:
resp = requests.get(url, headers=self.headers, verify=self.verify)
if resp.status_code != 200:
resp.close()
return
except requests.exceptions.RequestException as e:
self.logger.error("%s - %s" % (self.name, e))
return
initial_entries = resp.json()['items']
resp.close()
if initial_entries:
for entry in initial_entries:
entry_url = self.get_entry_url(self.url, entry)
try:
resp = requests.get(entry_url, headers=self.headers, \
verify=self.verify)
if resp.status_code != 200:
resp.close()
continue
except requests.exceptions.RequestException as e:
self.logger.error("%s - %s" % (self.name, e))
continue
try:
# Construct the event and initiate processing.
event = {'object':resp.json(), 'type':'ADDED'}
self.process_event(event)
except ValueError:
self.logger.error("Invalid data read from kube api server :"
" %s" % (entry))
resp.close()
def register_monitor(self):
"""Register this component for notifications from api server.
"""
if self.kube_api_resp:
self.kube_api_resp.close()
if not self._is_kube_api_server_alive():
msg = "kube_api_service is not available"
self.logger.error("%s - %s" %(self.name, msg))
time.sleep(self.timeout)
return
url = self._get_component_url()
try:
resp = requests.get(url, params={'watch': 'true'}, \
stream=True, headers=self.headers, \
verify=self.verify)
if resp.status_code != 200:
resp.close()
return
# Get handle to events for this monitor.
self.kube_api_resp = resp
self.kube_api_stream_handle = resp.iter_lines(chunk_size=256,
delimiter='\n')
self.logger.info("%s - Watches %s" %(self.name, url))
except requests.exceptions.RequestException as e:
self.logger.error("%s - %s" % (self.name, e))
def get_resource(self, resource_type, resource_name, \
namespace=None, beta=False):
json_data = {}
if beta == False:
base_url = self.v1_url
else:
base_url = self.beta_url
if resource_type == "namespaces":
url = "%s/%s" % (base_url, resource_type)
else:
url = "%s/namespaces/%s/%s/%s" % (base_url, namespace,
resource_type, resource_name)
try:
resp = requests.get(url, stream=True, \
headers=self.headers, verify=self.verify)
if resp.status_code == 200:
json_data = json.loads(resp.raw.read())
resp.close()
except requests.exceptions.RequestException as e:
self.logger.error("%s - %s" % (self.name, e))
return json_data
def patch_resource(self, resource_type, resource_name, \
merge_patch, namespace=None, beta=False):
if beta == False:
base_url = self.v1_url
else:
base_url = self.beta_url
if resource_type == "namespaces":
url = "%s/%s" % (base_url, resource_type)
else:
url = "%s/namespaces/%s/%s/%s" % (base_url, namespace,
resource_type, resource_name)
headers = {'Accept': 'application/json/', \
'Content-Type': 'application/strategic-merge-patch+json'}
headers.update(self.headers)
try:
resp = requests.patch(url, headers=headers, \
data=json.dumps(merge_patch), \
verify=self.verify)
if resp.status_code != 200:
resp.close()
return
except requests.exceptions.RequestException as e:
self.logger.error("%s - %s" % (self.name, e))
return resp.iter_lines(chunk_size=10, delimiter='\n')
def process(self):
"""Process available events."""
if not self.kube_api_stream_handle:
self.logger.error("%s - Event handler not found. "
"Cannot process its events." % (self.name))
return
resp = self.kube_api_resp
fp = resp.raw._fp.fp
if fp is None:
self.register_monitor()
return
try:
line = next(self.kube_api_stream_handle)
if not line:
return
except StopIteration:
return
except requests.exceptions.ChunkedEncodingError as e:
self.logger.error("%s - %s" % (self.name, e))
return
try:
self.process_event(json.loads(line))
except ValueError:
self.logger.error("Invalid JSON data from response stream:%s" % line)
def process_event(self, event):
"""Process an event."""
pass