234 lines
8.1 KiB
Python
234 lines
8.1 KiB
Python
#!/usr/bin/env python3
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import gevent.monkey
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gevent.monkey.patch_all()
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import click
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import flask
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import functools
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import gevent
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import gevent.wsgi
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import json
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import logging
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import os
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import signal
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import time
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import kube_ops_view
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from pathlib import Path
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from flask import Flask, redirect
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from flask_oauthlib.client import OAuth
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from .oauth import OAuthRemoteAppWithRefresh
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from urllib.parse import urljoin
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from .mock import query_mock_cluster
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from .kubernetes import query_kubernetes_cluster
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from .stores import MemoryStore, RedisStore
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from .cluster_discovery import DEFAULT_CLUSTERS, StaticClusterDiscoverer, ClusterRegistryDiscoverer, KubeconfigDiscoverer, MockDiscoverer
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from .update import update_clusters
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logger = logging.getLogger(__name__)
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SERVER_STATUS = {'shutdown': False}
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AUTHORIZE_URL = os.getenv('AUTHORIZE_URL')
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APP_URL = os.getenv('APP_URL')
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app = Flask(__name__)
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oauth = OAuth(app)
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auth = OAuthRemoteAppWithRefresh(
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oauth,
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'auth',
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request_token_url=None,
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access_token_method='POST',
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access_token_url=os.getenv('ACCESS_TOKEN_URL'),
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authorize_url=AUTHORIZE_URL
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)
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oauth.remote_apps['auth'] = auth
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def authorize(f):
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@functools.wraps(f)
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def wrapper(*args, **kwargs):
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if AUTHORIZE_URL and 'auth_token' not in flask.session:
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return redirect(urljoin(APP_URL, '/login'))
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return f(*args, **kwargs)
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return wrapper
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@app.route('/health')
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def health():
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if SERVER_STATUS['shutdown']:
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flask.abort(503)
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else:
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return 'OK'
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@app.route('/')
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@authorize
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def index():
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static_build_path = Path(__file__).parent / 'static' / 'build'
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candidates = sorted(static_build_path.glob('app*.js'))
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if candidates:
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app_js = candidates[0].name
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if app.debug:
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# cache busting for local development
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app_js += '?_={}'.format(time.time())
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else:
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logger.error('Could not find JavaScript application bundle app*.js in {}'.format(static_build_path))
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flask.abort(503, 'JavaScript application bundle not found (missing build)')
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return flask.render_template('index.html', app_js=app_js, version=kube_ops_view.__version__)
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def event(cluster_ids: set):
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# first sent full data once
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for cluster_id in (app.store.get('cluster-ids') or []):
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if not cluster_ids or cluster_id in cluster_ids:
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cluster = app.store.get(cluster_id)
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if cluster:
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yield 'event: clusterupdate\ndata: ' + json.dumps(cluster, separators=(',', ':')) + '\n\n'
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while True:
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for event_type, event_data in app.store.listen():
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# hacky, event_data can be delta or full cluster object
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if not cluster_ids or event_data.get('cluster_id', event_data.get('id')) in cluster_ids:
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yield 'event: ' + event_type + '\ndata: ' + json.dumps(event_data, separators=(',', ':')) + '\n\n'
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@app.route('/events')
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@authorize
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def get_events():
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'''SSE (Server Side Events), for an EventSource'''
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cluster_ids = set()
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for _id in flask.request.args.get('cluster_ids', '').split():
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if _id:
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cluster_ids.add(_id)
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return flask.Response(event(cluster_ids), mimetype='text/event-stream')
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@app.route('/screen-tokens', methods=['GET', 'POST'])
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@authorize
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def screen_tokens():
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new_token = None
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if flask.request.method == 'POST':
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new_token = app.store.create_screen_token()
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return flask.render_template('screen-tokens.html', new_token=new_token)
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@app.route('/screen/<token>')
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def redeem_screen_token(token: str):
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remote_addr = flask.request.headers.get('X-Forwarded-For') or flask.request.remote_addr
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logger.info('Trying to redeem screen token "{}" for IP {}..'.format(token, remote_addr))
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try:
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app.store.redeem_screen_token(token, remote_addr)
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except:
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flask.abort(401)
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flask.session['auth_token'] = (token, '')
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return redirect(urljoin(APP_URL, '/'))
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@app.route('/login')
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def login():
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redirect_uri = urljoin(APP_URL, '/login/authorized')
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return auth.authorize(callback=redirect_uri)
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@app.route('/logout')
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def logout():
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flask.session.pop('auth_token', None)
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return redirect(urljoin(APP_URL, '/'))
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@app.route('/login/authorized')
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def authorized():
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resp = auth.authorized_response()
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if resp is None:
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return 'Access denied: reason=%s error=%s' % (
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flask.request.args['error'],
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flask.request.args['error_description']
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)
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if not isinstance(resp, dict):
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return 'Invalid auth response'
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flask.session['auth_token'] = (resp['access_token'], '')
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return redirect(urljoin(APP_URL, '/'))
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def shutdown():
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# just wait some time to give Kubernetes time to update endpoints
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# this requires changing the readinessProbe's
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# PeriodSeconds and FailureThreshold appropriately
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# see https://godoc.org/k8s.io/kubernetes/pkg/api/v1#Probe
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gevent.sleep(10)
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exit(0)
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def exit_gracefully(signum, frame):
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logger.info('Received TERM signal, shutting down..')
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SERVER_STATUS['shutdown'] = True
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gevent.spawn(shutdown)
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def print_version(ctx, param, value):
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if not value or ctx.resilient_parsing:
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return
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click.echo('Kubernetes Operational View {}'.format(kube_ops_view.__version__))
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ctx.exit()
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class CommaSeparatedValues(click.ParamType):
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name = 'comma_separated_values'
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def convert(self, value, param, ctx):
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if isinstance(value, str):
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values = filter(None, value.split(','))
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else:
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values = value
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return values
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@click.command(context_settings={'help_option_names': ['-h', '--help']})
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@click.option('-V', '--version', is_flag=True, callback=print_version, expose_value=False, is_eager=True,
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help='Print the current version number and exit.')
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@click.option('-p', '--port', type=int, help='HTTP port to listen on (default: 8080)', envvar='SERVER_PORT', default=8080)
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@click.option('-d', '--debug', is_flag=True, help='Run in debugging mode', envvar='DEBUG')
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@click.option('-m', '--mock', is_flag=True, help='Mock Kubernetes clusters', envvar='MOCK')
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@click.option('--secret-key', help='Secret key for session cookies', envvar='SECRET_KEY', default='development')
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@click.option('--redis-url', help='Redis URL to use for pub/sub and job locking', envvar='REDIS_URL')
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@click.option('--clusters', type=CommaSeparatedValues(), help='Comma separated list of Kubernetes API server URLs (default: {})'.format(DEFAULT_CLUSTERS),
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envvar='CLUSTERS')
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@click.option('--cluster-registry-url', help='URL to cluster registry', envvar='CLUSTER_REGISTRY_URL')
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@click.option('--kubeconfig-path', type=click.Path(exists=True), help='Path to kubeconfig file', envvar='KUBECONFIG_PATH')
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@click.option('--kubeconfig-contexts', type=CommaSeparatedValues(), help='Path to kubeconfig file', envvar='KUBECONFIG_PATH')
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@click.option('--query-interval', type=float, help='Interval in seconds for querying clusters (default: 5)', envvar='QUERY_INTERVAL', default=5)
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def main(port, debug, mock, secret_key, redis_url, clusters: list, cluster_registry_url, kubeconfig_path, kubeconfig_contexts: list, query_interval):
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logging.basicConfig(level=logging.DEBUG if debug else logging.INFO)
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store = RedisStore(redis_url) if redis_url else MemoryStore()
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app.debug = debug
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app.secret_key = secret_key
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app.store = store
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if mock:
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cluster_query = query_mock_cluster
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discoverer = MockDiscoverer()
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else:
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cluster_query = query_kubernetes_cluster
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if cluster_registry_url:
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discoverer = ClusterRegistryDiscoverer(cluster_registry_url)
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elif kubeconfig_path:
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discoverer = KubeconfigDiscoverer(Path(kubeconfig_path), set(kubeconfig_contexts or []))
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else:
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api_server_urls = clusters or []
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discoverer = StaticClusterDiscoverer(api_server_urls)
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gevent.spawn(update_clusters, cluster_discoverer=discoverer, query_cluster=cluster_query, store=store, query_interval=query_interval, debug=debug)
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signal.signal(signal.SIGTERM, exit_gracefully)
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http_server = gevent.wsgi.WSGIServer(('0.0.0.0', port), app)
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logger.info('Listening on :{}..'.format(port))
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http_server.serve_forever()
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