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#!/usr/bin/env python
"""
Test Controller Server
======================
This script implements a test controller server for scalability tests. It can
be triggered to setup user databases and start and stop monitoring different
kinds of resources (cpu, mem, responsiveness, etc).
HTTP API
--------
The HTTP API is very simple:
+---------------------+-----------------------------------------------------+
| POST /setup | setup server databases for scalability test. |
+---------------------+-----------------------------------------------------+
| POST /cpu?pid=<PID> | start monitoring a process' CPU usage. |
+---------------------|-----------------------------------------------------+
| GET /cpu | return the cpu percentage used by the process since |
| | last call to PUT. |
+---------------------|-----------------------------------------------------+
| POST /mem?pid=<PID> | start monitoring a process' memory usage. |
+---------------------|-----------------------------------------------------+
| GET /mem | return mem usage stats used by the process since |
| | call to PUT. |
+---------------------+-----------------------------------------------------+
Environment Variables
---------------------
The following environment variables modify the behaviour of the resource
monitor:
HTTP_PORT - use that port to listen for HTTP requests (default: 7001).
"""
import json
import os
import psutil
from twisted.application import service, internet
from twisted.web import resource, server
from twisted.internet.task import LoopingCall
from twisted.logger import Logger
from test_controller.server.user_dbs import ensure_dbs
DEFAULT_HTTP_PORT = 7001
SUCCESS = json.dumps({'success': True})
logger = Logger(__name__)
#
# Resource Watcher classes (mem, cpu)
#
class ResourceWatcher(object):
def __init__(self, pid):
logger.info('%s started for process with PID %d'
% (self.__class__.__name__, int(pid)))
self.loop_call = LoopingCall(self._loop)
self.process = psutil.Process(pid)
self.data = []
self.result = None
@property
def running(self):
return self.loop_call.running
def _loop(self):
pass
def start(self):
self._start()
d = self.loop_call.start(self.interval)
d.addCallback(self._stop)
return d
def _start(self):
pass
def _stop(self, _):
raise NotImplementedError
def stop(self):
self.loop_call.stop()
class CpuWatcher(ResourceWatcher):
interval = 1
def _start(self):
self.process.cpu_percent()
def _stop(self, _):
self.result = {'cpu_percent': self.process.cpu_percent()}
def _mean(l):
return float(sum(l)) / len(l)
def _std(l):
if len(l) <= 1:
return 0
mean = _mean(l)
squares = [(x - mean) ** 2 for x in l]
return (sum(squares) / (len(l) - 1)) ** 0.5
class MemoryWatcher(ResourceWatcher):
interval = 0.1
def _loop(self):
sample = self.process.memory_percent(memtype='rss')
self.data.append(sample)
def _stop(self, _):
stats = {
'max': max(self.data),
'min': min(self.data),
'mean': _mean(self.data),
'std': _std(self.data),
}
self.result = {
'interval': self.interval,
'samples': self.data,
'memory_percent': stats,
}
#
# Resources for use with "twistd web"
#
class MissingPidError(Exception):
def __str__(self):
return "No PID was passed in request"
class InvalidPidError(Exception):
def __init__(self, pid):
Exception.__init__(self)
self.pid = pid
def __str__(self):
return "Invalid PID: %r" % self.pid
class MonitorResource(resource.Resource):
"""
A generic resource-monitor web resource.
"""
isLeaf = 1
def __init__(self, watcherClass):
resource.Resource.__init__(self)
self.watcherClass = watcherClass
self.watcher = None
def _get_pid(self, request):
if 'pid' not in request.args:
raise MissingPidError()
pid = request.args['pid'].pop()
if not pid.isdigit():
raise InvalidPidError(pid)
return int(pid)
def render_POST(self, request):
try:
pid = self._get_pid(request)
except Exception as e:
request.setResponseCode(500)
logger.error('Error processing request: %r' % e)
return json.dumps({'error': str(e)})
self._stop_watcher()
try:
self.watcher = self.watcherClass(pid)
self.watcher.start()
return SUCCESS
except psutil.NoSuchProcess as e:
request.setResponseCode(404)
return json.dumps({'error': str(e)})
def render_GET(self, request):
self._stop_watcher()
if self.watcher:
return json.dumps(self.watcher.result)
return json.dumps({})
def _stop_watcher(self):
if self.watcher and self.watcher.running:
self.watcher.stop()
class SetupResource(resource.Resource):
def render_POST(self, request):
d = ensure_dbs()
d.addCallback(self._success, request)
d.addErrback(self._error, request)
return server.NOT_DONE_YET
def _success(self, _, request):
request.write(SUCCESS)
request.finish()
def _error(self, e, request):
logger.error('Error processing request: %s' % e.getErrorMessage())
request.setResponseCode(500)
request.write(json.dumps({'error': str(e)}))
request.finish()
class Root(resource.Resource):
def __init__(self):
resource.Resource.__init__(self)
self.putChild('mem', MonitorResource(MemoryWatcher))
self.putChild('cpu', MonitorResource(CpuWatcher))
self.putChild('setup', SetupResource())
application = service.Application("Resource Monitor")
site = server.Site(Root())
port = os.environ.get('HTTP_PORT', DEFAULT_HTTP_PORT)
service = internet.TCPServer(port, site)
service.setServiceParent(application)
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