refactor sample inspector

JIRA: DOCTOR-98

Change-Id: I7110b680d0a0c64b1b2666abcea183e73373dca7
Signed-off-by: dongwenjuan <dong.wenjuan@zte.com.cn>

1 files changed, 151 insertions, 0 deletions

diff --git a/tests/inspector/sample.py b/tests/inspector/sample.py
new file mode 100644
index 00000000..db477de9
--- /dev/null
+++ b/tests/inspector/sample.py
@@ -0,0 +1,151 @@
+##############################################################################
+# Copyright (c) 2017 ZTE Corporation and others.
+#
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Apache License, Version 2.0
+# which accompanies this distribution, and is available at
+# http://www.apache.org/licenses/LICENSE-2.0
+##############################################################################
+import collections
+from flask import Flask
+from flask import request
+import json
+import time
+from threading import Thread
+import requests
+
+from identity_auth import get_identity_auth
+from identity_auth import get_session
+from os_clients import nova_client
+from inspector.base import BaseInspector
+
+
+class SampleInspector(BaseInspector):
+    event_type = 'compute.host.down'
+
+    def __init__(self, conf, log):
+        super(SampleInspector, self).__init__(conf, log)
+        self.inspector_url = self.get_inspector_url()
+        self.novaclients = list()
+        self._init_novaclients()
+        # Normally we use this client for non redundant API calls
+        self.nova = self.novaclients[0]
+
+        self.servers = collections.defaultdict(list)
+        self.hostnames = list()
+        self.app = None
+
+    def _init_novaclients(self):
+        self.NUMBER_OF_CLIENTS = self.conf.instance_count
+        auth = get_identity_auth(project=self.conf.doctor_project)
+        session = get_session(auth=auth)
+        for i in range(self.NUMBER_OF_CLIENTS):
+            self.novaclients.append(
+                nova_client(self.conf.nova_version, session))
+
+    def _init_servers_list(self):
+        self.servers.clear()
+        opts = {'all_tenants': True}
+        servers = self.nova.servers.list(search_opts=opts)
+        for server in servers:
+            try:
+                host = server.__dict__.get('OS-EXT-SRV-ATTR:host')
+                self.servers[host].append(server)
+                self.log.debug('get hostname=%s from server=%s' % (host, server))
+            except Exception as e:
+                self.log.info('can not get hostname from server=%s' % server)
+
+    def get_inspector_url(self):
+        return 'http://%s:%s' % (self.conf.inspector.ip, self.conf.inspector.port)
+
+    def start(self):
+        self.log.info('sample inspector start......')
+        self._init_servers_list()
+        self.app = InspectorApp(self.conf.inspector.port, self, self.log)
+        self.app.start()
+
+    def stop(self):
+        self.log.info('sample inspector stop......')
+        if not self.app:
+            return
+        for hostname in self.hostnames:
+            self.nova.services.force_down(hostname, 'nova-compute', False)
+
+        headers = {
+            'Content-Type': 'application/json',
+            'Accept': 'application/json',
+        }
+        url = '%s%s' % (self.inspector_url, 'shutdown') \
+            if self.inspector_url.endswith('/') else \
+            '%s%s' % (self.inspector_url, '/shutdown')
+        requests.post(url, data='', headers=headers)
+
+    def handle_events(self, events):
+        for event in events:
+            hostname = event['details']['hostname']
+            event_type = event['type']
+            if event_type == self.event_type:
+                self.hostnames.append(hostname)
+                self.disable_compute_host(hostname)
+
+    def disable_compute_host(self, hostname):
+        threads = []
+        if len(self.servers[hostname]) > self.NUMBER_OF_CLIENTS:
+            # TODO(tojuvone): This could be enhanced in future with dynamic
+            # reuse of self.novaclients when all threads in use
+            self.log.error('%d servers in %s. Can handle only %d'%(
+                           self.servers[hostname], hostname, self.NUMBER_OF_CLIENTS))
+        for nova, server in zip(self.novaclients, self.servers[hostname]):
+            t = ThreadedResetState(nova, "error", server, self.log)
+            t.start()
+            threads.append(t)
+        for t in threads:
+            t.join()
+        self.nova.services.force_down(hostname, 'nova-compute', True)
+        self.log.info('doctor mark host(%s) down at %s' % (hostname, time.time()))
+
+
+class ThreadedResetState(Thread):
+
+    def __init__(self, nova, state, server, log):
+        Thread.__init__(self)
+        self.nova = nova
+        self.state = state
+        self.server = server
+        self.log = log
+
+    def run(self):
+        self.nova.servers.reset_state(self.server, self.state)
+        self.log.info('doctor mark vm(%s) error at %s' % (self.server, time.time()))
+
+
+class InspectorApp(Thread):
+
+    def __init__(self, port, inspector, log):
+        Thread.__init__(self)
+        self.port = port
+        self.inspector = inspector
+        self.log = log
+
+    def run(self):
+        app = Flask('inspector')
+
+        @app.route('/events', methods=['PUT'])
+        def event_posted():
+            self.log.info('event posted in sample inspector at %s' % time.time())
+            self.log.info('sample inspector = %s' % self.inspector)
+            self.log.info('sample inspector received data = %s' % request.data)
+            events = json.loads(request.data)
+            self.inspector.handle_events(events)
+            return "OK"
+
+        @app.route('/shutdown', methods=['POST'])
+        def shutdown():
+            self.log.info('shutdown inspector app server at %s' % time.time())
+            func = request.environ.get('werkzeug.server.shutdown')
+            if func is None:
+                raise RuntimeError('Not running with the Werkzeug Server')
+            func()
+            return 'inspector app shutting down...'
+
+        app.run(host="0.0.0.0", port=self.port)