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browser_launcher.py
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browser_launcher.py
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import logging
import subprocess
import sys
import time
import os
import requests
from django.conf import settings
from django.urls import reverse
from urllib.parse import urljoin
import otree.channels.utils as channel_utils
from otree.session import SESSION_CONFIGS_DICT
from ws4py.client.threadedclient import WebSocketClient
AUTH_FAILURE_MESSAGE = """
Could not login to the server using your ADMIN_USERNAME
and ADMIN_PASSWORD from settings.py. If you are testing
browser bots on a remote server, make sure the username
and password on your local oTree installation match that
on the server.
"""
BROWSER_CMDS = {
'windows': {
'chrome': [
'C:/Program Files (x86)/Google/Chrome/Application/chrome.exe',
'C:/Program Files/Google/Chrome/Application/chrome.exe',
os.getenv('LOCALAPPDATA', '') + r"\Google\Chrome\Application\chrome.exe",
],
},
'mac': {
'chrome': ['/Applications/Google Chrome.app/Contents/MacOS/Google Chrome'],
},
'linux': {
'chrome': ['google-chrome'],
}
}
def windows_mac_or_linux():
if sys.platform.startswith("win"):
platform = 'windows'
elif sys.platform.startswith("darwin"):
platform = 'mac'
else:
platform = 'linux'
return platform
class OtreeWebSocketClient(WebSocketClient):
def __init__(self, *args, **kwargs):
self.session_size = kwargs.pop('session_size')
self.seen_participant_codes = set()
self.participants_finished = 0
super(OtreeWebSocketClient, self).__init__(*args, **kwargs)
def received_message(self, message):
code = message
if code not in self.seen_participant_codes:
self.seen_participant_codes.add(code)
self.participants_finished += 1
if self.participants_finished == self.session_size:
self.close(reason='success')
class Launcher:
def __init__(self, options):
self.options = options
def run(self):
options = self.options
self.check_browser()
self.set_urls()
self.client = requests.session()
self.ping_server()
self.server_configuration_check()
sessions_to_create = []
if options["session_config_name"]:
session_config_name = options["session_config_name"]
if session_config_name not in SESSION_CONFIGS_DICT:
raise ValueError(
'No session config named "{}"'.format(
session_config_name)
)
session_config_names = [session_config_name]
else:
# default to all session configs
session_config_names = SESSION_CONFIGS_DICT.keys()
self.max_name_length = max(
len(config_name) for config_name in session_config_names
)
for session_config_name in session_config_names:
session_config = SESSION_CONFIGS_DICT[session_config_name]
num_bot_cases = session_config.get_num_bot_cases()
for case_number in range(num_bot_cases):
num_participants = (options.get('num_participants') or
session_config['num_demo_participants'])
sessions_to_create.append({
'session_config_name': session_config_name,
'num_participants': num_participants,
'case_number': case_number,
})
total_time_spent = 0
# run in a separate loop, because we want to validate upfront
# that the session configs are valid, etc,
# rather than the command failing halfway through
for session_to_create in sessions_to_create:
total_time_spent += self.run_session(**session_to_create)
print('Total: {} seconds'.format(
round(total_time_spent, 1)
))
# don't delete sessions -- it's too susceptible to race conditions
# between sending the completion message and loading the last page
# plus people want to preserve the data
# just label these sessions clearly in the admin UI
# and make it easy to delete manually
def run_session(
self, session_config_name, num_participants, case_number):
self.close_existing_session()
browser_process = self.launch_browser(num_participants)
row_fmt = "{:<%d} {:>2} participants..." % (self.max_name_length + 1)
print(row_fmt.format(session_config_name, num_participants), end='')
session_code = self.create_session(
session_config_name, num_participants, case_number)
bot_start_time = time.time()
self.websocket_listen(session_code, num_participants)
time_spent = round(time.time() - bot_start_time, 1)
print('...finished in {} seconds'.format(time_spent))
# TODO:
# - if Chrome/FF is already running when the browser is launched,
# this does nothing.
# also, they report a crash (in Firefox it blocks the app from
# starting again), in Chrome it's just a side notice
browser_process.terminate()
return time_spent
def websocket_listen(self, session_code, num_participants):
# seems that urljoin doesn't work with ws:// urls
# so do the ws replace after URLjoin
websocket_url = urljoin(
self.server_url,
channel_utils.browser_bots_launcher_path(session_code)
)
websocket_url = websocket_url.replace(
'http://', 'ws://').replace('https://', 'wss://')
ws_client = OtreeWebSocketClient(
websocket_url,
session_size=num_participants,
)
ws_client.connect()
ws_client.run_forever()
def set_urls(self):
# SERVER URL
server_url = self.options['server_url']
# if it doesn't start with http:// or https://,
# assume http://
if not server_url.startswith('http'):
server_url = 'http://' + server_url
self.server_url = server_url
# CREATE_SESSION URL
self.create_session_url = urljoin(
server_url,
reverse('CreateBrowserBotsSession')
)
# LOGIN URL
# TODO: use reverse? reverse('django.contrib.auth.views.login')
self.login_url = urljoin(server_url, '/accounts/login/')
def post(self, url, data=None):
data = data or {}
data.update({'csrfmiddlewaretoken': self.client.cookies['csrftoken']})
# need to set the referer for CSRF protection to work when using HTTPS
return self.client.post(url, data, headers={'referer': url})
def server_configuration_check(self):
# .get just returns server readiness info
# try to get this page without logging in
# we don't want to login if it isn't necessary, because maybe
# settings.ADMIN_PASSWORD is empty, and therefore no user account
# exists.
resp = self.client.get(self.create_session_url)
# if AUTH_LEVEL is set on remote server, then this will redirect
# to a login page
login_url = self.login_url
if login_url in resp.url:
# login
resp = self.post(
login_url,
data={
'username': settings.ADMIN_USERNAME,
'password': settings.ADMIN_PASSWORD,
},
)
if login_url in resp.url:
raise Exception(AUTH_FAILURE_MESSAGE)
# get it again, we are logged in now
resp = self.client.get(self.create_session_url)
server_check = resp.json() # noqa
# no need to warn about these for now
# if server_check['runserver']:
# print(RUNSERVER_WARNING)
# if server_check['sqlite']:
# print(SQLITE_WARNING)
def ping_server(self):
logging.getLogger("requests").setLevel(logging.WARNING)
try:
# open this just to populate CSRF cookie
# (because login page contains a form)
resp = self.client.get(self.login_url)
except:
raise Exception(
'Could not connect to server at {}.'
'Before running this command, '
'you need to run the server (see --server-url flag).'.format(
self.server_url,
)
)
if not resp.ok:
raise Exception(
'Could not open page at {}.'
'(HTTP status code: {})'.format(
self.login_url,
resp.status_code,
)
)
def create_session(
self, session_config_name, num_participants, case_number
):
resp = self.post(
self.create_session_url,
data={
'session_config_name': session_config_name,
'num_participants': num_participants,
'case_number': case_number,
}
)
assert resp.ok, 'Failed to create session. Check the server logs.'
session_code = resp.content.decode('utf-8')
return session_code
def check_browser(self):
platform = windows_mac_or_linux()
custom_browser_cmd = getattr(settings, 'BROWSER_COMMAND', None)
if custom_browser_cmd:
self.browser_cmds = [custom_browser_cmd]
else:
# right now hardcoded to Chrome unless settings.BROWSER_COMMAND set
self.browser_cmds = BROWSER_CMDS[platform]['chrome']
first_browser_type = self.browser_cmds[0].lower()
# check if browser is running
if 'chrome' in first_browser_type:
browser_type = 'Chrome'
elif 'firefox' in first_browser_type:
browser_type = 'Firefox'
else:
return
if windows_mac_or_linux() == 'windows':
process_list_args = ['tasklist']
else:
process_list_args = ['ps', 'axw']
ps_output = subprocess.check_output(process_list_args).decode('utf-8')
is_running = browser_type.lower() in ps_output.lower()
if is_running:
print(
'WARNING: it looks like {browser} is already running. '
'You should quit {browser} before running '
'this command.'.format(browser=browser_type)
)
def close_existing_session(self):
# make sure room is closed
resp = self.post(
urljoin(self.server_url, reverse('CloseBrowserBotsSession')))
if not resp.ok:
raise AssertionError(
'Request to close existing browser bots session failed. '
'Response: {} {}'.format(repr(resp), resp.text)
)
def launch_browser(self, num_participants):
wait_room_url = urljoin(
self.server_url,
reverse('BrowserBotStartLink')
)
for browser_cmd in self.browser_cmds:
args = [browser_cmd]
for i in range(num_participants):
args.append(wait_room_url)
try:
return subprocess.Popen(args)
except FileNotFoundError:
pass
msg = (
'Could not find a browser at the following path(s):\n\n'
'{}\n\n'
'Note: in settings.py, you can set BROWSER_COMMAND '
'to the path to your browser executable. '
'Otherwise, oTree will try to launch Chrome from its usual path.'
).format('\n'.join(self.browser_cmds))
# we should show the original exception, because it might have
# valuable info about why the browser didn't launch,
# not raise from None.
raise FileNotFoundError(msg)