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How to use request_stats method in locust

Best Python code snippet using locust

server.py

Source:server.py

1# Copyright (C) 2019 Garmin Ltd.2#3# SPDX-License-Identifier: GPL-2.0-only4#5from contextlib import closing6from datetime import datetime7import asyncio8import json9import logging10import math11import os12import signal13import socket14import time15from . import chunkify, DEFAULT_MAX_CHUNK16logger = logging.getLogger('hashserv.server')17class Measurement(object):18    def __init__(self, sample):19        self.sample = sample20    def start(self):21        self.start_time = time.perf_counter()22    def end(self):23        self.sample.add(time.perf_counter() - self.start_time)24    def __enter__(self):25        self.start()26        return self27    def __exit__(self, *args, **kwargs):28        self.end()29class Sample(object):30    def __init__(self, stats):31        self.stats = stats32        self.num_samples = 033        self.elapsed = 034    def measure(self):35        return Measurement(self)36    def __enter__(self):37        return self38    def __exit__(self, *args, **kwargs):39        self.end()40    def add(self, elapsed):41        self.num_samples += 142        self.elapsed += elapsed43    def end(self):44        if self.num_samples:45            self.stats.add(self.elapsed)46            self.num_samples = 047            self.elapsed = 048class Stats(object):49    def __init__(self):50        self.reset()51    def reset(self):52        self.num = 053        self.total_time = 054        self.max_time = 055        self.m = 056        self.s = 057        self.current_elapsed = None58    def add(self, elapsed):59        self.num += 160        if self.num == 1:61            self.m = elapsed62            self.s = 063        else:64            last_m = self.m65            self.m = last_m + (elapsed - last_m) / self.num66            self.s = self.s + (elapsed - last_m) * (elapsed - self.m)67        self.total_time += elapsed68        if self.max_time < elapsed:69            self.max_time = elapsed70    def start_sample(self):71        return Sample(self)72    @property73    def average(self):74        if self.num == 0:75            return 076        return self.total_time / self.num77    @property78    def stdev(self):79        if self.num <= 1:80            return 081        return math.sqrt(self.s / (self.num - 1))82    def todict(self):83        return {k: getattr(self, k) for k in ('num', 'total_time', 'max_time', 'average', 'stdev')}84class ClientError(Exception):85    pass86class ServerClient(object):87    FAST_QUERY = 'SELECT taskhash, method, unihash FROM tasks_v2 WHERE method=:method AND taskhash=:taskhash ORDER BY created ASC LIMIT 1'88    ALL_QUERY =  'SELECT *                         FROM tasks_v2 WHERE method=:method AND taskhash=:taskhash ORDER BY created ASC LIMIT 1'89    def __init__(self, reader, writer, db, request_stats):90        self.reader = reader91        self.writer = writer92        self.db = db93        self.request_stats = request_stats94        self.max_chunk = DEFAULT_MAX_CHUNK95        self.handlers = {96            'get': self.handle_get,97            'report': self.handle_report,98            'report-equiv': self.handle_equivreport,99            'get-stream': self.handle_get_stream,100            'get-stats': self.handle_get_stats,101            'reset-stats': self.handle_reset_stats,102            'chunk-stream': self.handle_chunk,103        }104    async def process_requests(self):105        try:106            self.addr = self.writer.get_extra_info('peername')107            logger.debug('Client %r connected' % (self.addr,))108            # Read protocol and version109            protocol = await self.reader.readline()110            if protocol is None:111                return112            (proto_name, proto_version) = protocol.decode('utf-8').rstrip().split()113            if proto_name != 'OEHASHEQUIV':114                return115            proto_version = tuple(int(v) for v in proto_version.split('.'))116            if proto_version < (1, 0) or proto_version > (1, 1):117                return118            # Read headers. Currently, no headers are implemented, so look for119            # an empty line to signal the end of the headers120            while True:121                line = await self.reader.readline()122                if line is None:123                    return124                line = line.decode('utf-8').rstrip()125                if not line:126                    break127            # Handle messages128            while True:129                d = await self.read_message()130                if d is None:131                    break132                await self.dispatch_message(d)133                await self.writer.drain()134        except ClientError as e:135            logger.error(str(e))136        finally:137            self.writer.close()138    async def dispatch_message(self, msg):139        for k in self.handlers.keys():140            if k in msg:141                logger.debug('Handling %s' % k)142                if 'stream' in k:143                    await self.handlers[k](msg[k])144                else:145                    with self.request_stats.start_sample() as self.request_sample, \146                            self.request_sample.measure():147                        await self.handlers[k](msg[k])148                return149        raise ClientError("Unrecognized command %r" % msg)150    def write_message(self, msg):151        for c in chunkify(json.dumps(msg), self.max_chunk):152            self.writer.write(c.encode('utf-8'))153    async def read_message(self):154        l = await self.reader.readline()155        if not l:156            return None157        try:158            message = l.decode('utf-8')159            if not message.endswith('\n'):160                return None161            return json.loads(message)162        except (json.JSONDecodeError, UnicodeDecodeError) as e:163            logger.error('Bad message from client: %r' % message)164            raise e165    async def handle_chunk(self, request):166        lines = []167        try:168            while True:169                l = await self.reader.readline()170                l = l.rstrip(b"\n").decode("utf-8")171                if not l:172                    break173                lines.append(l)174            msg = json.loads(''.join(lines))175        except (json.JSONDecodeError, UnicodeDecodeError) as e:176            logger.error('Bad message from client: %r' % message)177            raise e178        if 'chunk-stream' in msg:179            raise ClientError("Nested chunks are not allowed")180        await self.dispatch_message(msg)181    async def handle_get(self, request):182        method = request['method']183        taskhash = request['taskhash']184        if request.get('all', False):185            row = self.query_equivalent(method, taskhash, self.ALL_QUERY)186        else:187            row = self.query_equivalent(method, taskhash, self.FAST_QUERY)188        if row is not None:189            logger.debug('Found equivalent task %s -> %s', (row['taskhash'], row['unihash']))190            d = {k: row[k] for k in row.keys()}191            self.write_message(d)192        else:193            self.write_message(None)194    async def handle_get_stream(self, request):195        self.write_message('ok')196        while True:197            l = await self.reader.readline()198            if not l:199                return200            try:201                # This inner loop is very sensitive and must be as fast as202                # possible (which is why the request sample is handled manually203                # instead of using 'with', and also why logging statements are204                # commented out.205                self.request_sample = self.request_stats.start_sample()206                request_measure = self.request_sample.measure()207                request_measure.start()208                l = l.decode('utf-8').rstrip()209                if l == 'END':210                    self.writer.write('ok\n'.encode('utf-8'))211                    return212                (method, taskhash) = l.split()213                #logger.debug('Looking up %s %s' % (method, taskhash))214                row = self.query_equivalent(method, taskhash, self.FAST_QUERY)215                if row is not None:216                    msg = ('%s\n' % row['unihash']).encode('utf-8')217                    #logger.debug('Found equivalent task %s -> %s', (row['taskhash'], row['unihash']))218                else:219                    msg = '\n'.encode('utf-8')220                self.writer.write(msg)221            finally:222                request_measure.end()223                self.request_sample.end()224            await self.writer.drain()225    async def handle_report(self, data):226        with closing(self.db.cursor()) as cursor:227            cursor.execute('''228                -- Find tasks with a matching outhash (that is, tasks that229                -- are equivalent)230                SELECT taskhash, method, unihash FROM tasks_v2 WHERE method=:method AND outhash=:outhash231                -- If there is an exact match on the taskhash, return it.232                -- Otherwise return the oldest matching outhash of any233                -- taskhash234                ORDER BY CASE WHEN taskhash=:taskhash THEN 1 ELSE 2 END,235                    created ASC236                -- Only return one row237                LIMIT 1238                ''', {k: data[k] for k in ('method', 'outhash', 'taskhash')})239            row = cursor.fetchone()240            # If no matching outhash was found, or one *was* found but it241            # wasn't an exact match on the taskhash, a new entry for this242            # taskhash should be added243            if row is None or row['taskhash'] != data['taskhash']:244                # If a row matching the outhash was found, the unihash for245                # the new taskhash should be the same as that one.246                # Otherwise the caller provided unihash is used.247                unihash = data['unihash']248                if row is not None:249                    unihash = row['unihash']250                insert_data = {251                    'method': data['method'],252                    'outhash': data['outhash'],253                    'taskhash': data['taskhash'],254                    'unihash': unihash,255                    'created': datetime.now()256                }257                for k in ('owner', 'PN', 'PV', 'PR', 'task', 'outhash_siginfo'):258                    if k in data:259                        insert_data[k] = data[k]260                cursor.execute('''INSERT INTO tasks_v2 (%s) VALUES (%s)''' % (261                    ', '.join(sorted(insert_data.keys())),262                    ', '.join(':' + k for k in sorted(insert_data.keys()))),263                    insert_data)264                self.db.commit()265                logger.info('Adding taskhash %s with unihash %s',266                            data['taskhash'], unihash)267                d = {268                    'taskhash': data['taskhash'],269                    'method': data['method'],270                    'unihash': unihash271                }272            else:273                d = {k: row[k] for k in ('taskhash', 'method', 'unihash')}274        self.write_message(d)275    async def handle_equivreport(self, data):276        with closing(self.db.cursor()) as cursor:277            insert_data = {278                'method': data['method'],279                'outhash': "",280                'taskhash': data['taskhash'],281                'unihash': data['unihash'],282                'created': datetime.now()283            }284            for k in ('owner', 'PN', 'PV', 'PR', 'task', 'outhash_siginfo'):285                if k in data:286                    insert_data[k] = data[k]287            cursor.execute('''INSERT OR IGNORE INTO tasks_v2 (%s) VALUES (%s)''' % (288                ', '.join(sorted(insert_data.keys())),289                ', '.join(':' + k for k in sorted(insert_data.keys()))),290                insert_data)291            self.db.commit()292            # Fetch the unihash that will be reported for the taskhash. If the293            # unihash matches, it means this row was inserted (or the mapping294            # was already valid)295            row = self.query_equivalent(data['method'], data['taskhash'], self.FAST_QUERY)296            if row['unihash'] == data['unihash']:297                logger.info('Adding taskhash equivalence for %s with unihash %s',298                                data['taskhash'], row['unihash'])299            d = {k: row[k] for k in ('taskhash', 'method', 'unihash')}300        self.write_message(d)301    async def handle_get_stats(self, request):302        d = {303            'requests': self.request_stats.todict(),304        }305        self.write_message(d)306    async def handle_reset_stats(self, request):307        d = {308            'requests': self.request_stats.todict(),309        }310        self.request_stats.reset()311        self.write_message(d)312    def query_equivalent(self, method, taskhash, query):313        # This is part of the inner loop and must be as fast as possible314        try:315            cursor = self.db.cursor()316            cursor.execute(query, {'method': method, 'taskhash': taskhash})317            return cursor.fetchone()318        except:319            cursor.close()320class Server(object):321    def __init__(self, db, loop=None):322        self.request_stats = Stats()323        self.db = db324        if loop is None:325            self.loop = asyncio.new_event_loop()326            self.close_loop = True327        else:328            self.loop = loop329            self.close_loop = False330        self._cleanup_socket = None331    def start_tcp_server(self, host, port):332        self.server = self.loop.run_until_complete(333            asyncio.start_server(self.handle_client, host, port, loop=self.loop)334        )335        for s in self.server.sockets:336            logger.info('Listening on %r' % (s.getsockname(),))337            # Newer python does this automatically. Do it manually here for338            # maximum compatibility339            s.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)340            s.setsockopt(socket.SOL_TCP, socket.TCP_QUICKACK, 1)341        name = self.server.sockets[0].getsockname()342        if self.server.sockets[0].family == socket.AF_INET6:343            self.address = "[%s]:%d" % (name[0], name[1])344        else:345            self.address = "%s:%d" % (name[0], name[1])346    def start_unix_server(self, path):347        def cleanup():348            os.unlink(path)349        cwd = os.getcwd()350        try:351            # Work around path length limits in AF_UNIX352            os.chdir(os.path.dirname(path))353            self.server = self.loop.run_until_complete(354                asyncio.start_unix_server(self.handle_client, os.path.basename(path), loop=self.loop)355            )356        finally:357            os.chdir(cwd)358        logger.info('Listening on %r' % path)359        self._cleanup_socket = cleanup360        self.address = "unix://%s" % os.path.abspath(path)361    async def handle_client(self, reader, writer):362        # writer.transport.set_write_buffer_limits(0)363        try:364            client = ServerClient(reader, writer, self.db, self.request_stats)365            await client.process_requests()366        except Exception as e:367            import traceback368            logger.error('Error from client: %s' % str(e), exc_info=True)369            traceback.print_exc()370            writer.close()371        logger.info('Client disconnected')372    def serve_forever(self):373        def signal_handler():374            self.loop.stop()375        self.loop.add_signal_handler(signal.SIGTERM, signal_handler)376        try:377            self.loop.run_forever()378        except KeyboardInterrupt:379            pass380        self.server.close()381        self.loop.run_until_complete(self.server.wait_closed())382        logger.info('Server shutting down')383        if self.close_loop:384            self.loop.close()385        if self._cleanup_socket is not None:...

stats.py

Source:stats.py

1from flask import current_app2from app.server.util.utils import timestamp3# We use a list to calculate requests per second4request_stats = []5def add_request():6    t = timestamp()7    while len(request_stats) > 0 and request_stats[0] < t - current_app.config['REQUEST_STATS_WINDOW']:8        del request_stats[0]9    request_stats.append(t)10def requests_per_second():...

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