"""
This module defines handlers for storing sessions when handles
sessions of users connecting to the server.
There are two similar but separate stores of sessions:
- ServerSessionHandler - this stores generic game sessions
for the game. These sessions has no knowledge about
how they are connected to the world.
- PortalSessionHandler - this stores sessions created by
twisted protocols. These are dumb connectors that
handle network communication but holds no game info.
"""
import time
from django.conf import settings
from evennia.commands.cmdhandler import CMD_LOGINSTART
from evennia.utils.logger import log_trace
from evennia.utils.utils import (
variable_from_module,
is_iter,
make_iter,
delay,
callables_from_module,
)
from evennia.server.signals import SIGNAL_ACCOUNT_POST_LOGIN, SIGNAL_ACCOUNT_POST_LOGOUT
from evennia.server.signals import SIGNAL_ACCOUNT_POST_FIRST_LOGIN, SIGNAL_ACCOUNT_POST_LAST_LOGOUT
from evennia.utils.inlinefuncs import parse_inlinefunc
from codecs import decode as codecs_decode
_INLINEFUNC_ENABLED = settings.INLINEFUNC_ENABLED
# delayed imports
_AccountDB = None
_ServerSession = None
_ServerConfig = None
_ScriptDB = None
_OOB_HANDLER = None
_ERR_BAD_UTF8 = "Your client sent an incorrect UTF-8 sequence."
[docs]class DummySession(object):
sessid = 0
DUMMYSESSION = DummySession()
# AMP signals
PCONN = chr(1) # portal session connect
PDISCONN = chr(2) # portal session disconnect
PSYNC = chr(3) # portal session sync
SLOGIN = chr(4) # server session login
SDISCONN = chr(5) # server session disconnect
SDISCONNALL = chr(6) # server session disconnect all
SSHUTD = chr(7) # server shutdown
SSYNC = chr(8) # server session sync
SCONN = chr(11) # server portal connection (for bots)
PCONNSYNC = chr(12) # portal post-syncing session
PDISCONNALL = chr(13) # portal session disconnect all
SRELOAD = chr(14) # server reloading (have portal start a new server)
SSTART = chr(15) # server start (portal must already be running anyway)
PSHUTD = chr(16) # portal (+server) shutdown
SSHUTD = chr(17) # server shutdown
PSTATUS = chr(18) # ping server or portal status
SRESET = chr(19) # server shutdown in reset mode
# i18n
from django.utils.translation import gettext as _
_SERVERNAME = settings.SERVERNAME
_MULTISESSION_MODE = settings.MULTISESSION_MODE
_IDLE_TIMEOUT = settings.IDLE_TIMEOUT
_DELAY_CMD_LOGINSTART = settings.DELAY_CMD_LOGINSTART
_MAX_SERVER_COMMANDS_PER_SECOND = 100.0
_MAX_SESSION_COMMANDS_PER_SECOND = 5.0
_MODEL_MAP = None
# input handlers
_INPUT_FUNCS = {}
for modname in make_iter(settings.INPUT_FUNC_MODULES):
_INPUT_FUNCS.update(callables_from_module(modname))
[docs]def delayed_import():
"""
Helper method for delayed import of all needed entities.
"""
global _ServerSession, _AccountDB, _ServerConfig, _ScriptDB
if not _ServerSession:
# we allow optional arbitrary serversession class for overloading
modulename, classname = settings.SERVER_SESSION_CLASS.rsplit(".", 1)
_ServerSession = variable_from_module(modulename, classname)
if not _AccountDB:
from evennia.accounts.models import AccountDB as _AccountDB
if not _ServerConfig:
from evennia.server.models import ServerConfig as _ServerConfig
if not _ScriptDB:
from evennia.scripts.models import ScriptDB as _ScriptDB
# including once to avoid warnings in Python syntax checkers
assert _ServerSession
assert _AccountDB
assert _ServerConfig
assert _ScriptDB
# -----------------------------------------------------------
# SessionHandler base class
# ------------------------------------------------------------
[docs]class SessionHandler(dict):
"""
This handler holds a stack of sessions.
"""
def __getitem__(self, key):
"Clean out None-sessions automatically."
if None in self:
del self[None]
return super().__getitem__(key)
[docs] def get(self, key, default=None):
"Clean out None-sessions automatically."
if None in self:
del self[None]
return super().get(key, default)
def __setitem__(self, key, value):
"Don't assign None sessions"
if key is not None:
super().__setitem__(key, value)
def __contains__(self, key):
"None-keys are not accepted."
return False if key is None else super().__contains__(key)
[docs] def get_sessions(self, include_unloggedin=False):
"""
Returns the connected session objects.
Args:
include_unloggedin (bool, optional): Also list Sessions
that have not yet authenticated.
Returns:
sessions (list): A list of `Session` objects.
"""
if include_unloggedin:
return list(self.values())
else:
return [session for session in self.values() if session.logged_in]
[docs] def get_all_sync_data(self):
"""
Create a dictionary of sessdata dicts representing all
sessions in store.
Returns:
syncdata (dict): A dict of sync data.
"""
return dict((sessid, sess.get_sync_data()) for sessid, sess in self.items())
[docs] def clean_senddata(self, session, kwargs):
"""
Clean up data for sending across the AMP wire. Also apply INLINEFUNCS.
Args:
session (Session): The relevant session instance.
kwargs (dict) Each keyword represents a
send-instruction, with the keyword itself being the name
of the instruction (like "text"). Suitable values for each
keyword are:
::
arg -> [[arg], {}]
[args] -> [[args], {}]
{kwargs} -> [[], {kwargs}]
[args, {kwargs}] -> [[arg], {kwargs}]
[[args], {kwargs}] -> [[args], {kwargs}]
Returns:
kwargs (dict): A cleaned dictionary of cmdname:[[args],{kwargs}] pairs,
where the keys, args and kwargs have all been converted to
send-safe entities (strings or numbers), and inlinefuncs have been
applied.
"""
options = kwargs.pop("options", None) or {}
raw = options.get("raw", False)
strip_inlinefunc = options.get("strip_inlinefunc", False)
def _utf8(data):
if isinstance(data, bytes):
try:
data = codecs_decode(data, session.protocol_flags["ENCODING"])
except LookupError:
# wrong encoding set on the session. Set it to a safe one
session.protocol_flags["ENCODING"] = "utf-8"
data = codecs_decode(data, "utf-8")
except UnicodeDecodeError:
# incorrect unicode sequence
session.sendLine(_ERR_BAD_UTF8)
data = ""
return data
def _validate(data):
"Helper function to convert data to AMP-safe (picketable) values"
if isinstance(data, dict):
newdict = {}
for key, part in data.items():
newdict[key] = _validate(part)
return newdict
elif is_iter(data):
return [_validate(part) for part in data]
elif isinstance(data, (str, bytes)):
data = _utf8(data)
if _INLINEFUNC_ENABLED and not raw and isinstance(self, ServerSessionHandler):
# only parse inlinefuncs on the outgoing path (sessionhandler->)
data = parse_inlinefunc(data, strip=strip_inlinefunc, session=session)
return str(data)
elif (
hasattr(data, "id")
and hasattr(data, "db_date_created")
and hasattr(data, "__dbclass__")
):
# convert database-object to their string representation.
return _validate(str(data))
else:
return data
rkwargs = {}
for key, data in kwargs.items():
key = _validate(key)
if not data:
if key == "text":
# we don't allow sending text = None, this must mean
# that the text command is not to be used.
continue
rkwargs[key] = [[], {}]
elif isinstance(data, dict):
rkwargs[key] = [[], _validate(data)]
elif is_iter(data):
if isinstance(data[-1], dict):
if len(data) == 2:
if is_iter(data[0]):
rkwargs[key] = [_validate(data[0]), _validate(data[1])]
else:
rkwargs[key] = [[_validate(data[0])], _validate(data[1])]
else:
rkwargs[key] = [_validate(data[:-1]), _validate(data[-1])]
else:
rkwargs[key] = [_validate(data), {}]
else:
rkwargs[key] = [[_validate(data)], {}]
rkwargs[key][1]["options"] = options
return rkwargs
# ------------------------------------------------------------
# Server-SessionHandler class
# ------------------------------------------------------------
[docs]class ServerSessionHandler(SessionHandler):
"""
This object holds the stack of sessions active in the game at
any time.
A session register with the handler in two steps, first by
registering itself with the connect() method. This indicates an
non-authenticated session. Whenever the session is authenticated
the session together with the related account is sent to the login()
method.
"""
# AMP communication methods
[docs] def __init__(self, *args, **kwargs):
"""
Init the handler.
"""
super().__init__(*args, **kwargs)
self.server = None # set at server initialization
self.server_data = {"servername": _SERVERNAME}
# will be set on psync
self.portal_start_time = 0.0
def _run_cmd_login(self, session):
"""
Launch the CMD_LOGINSTART command. This is wrapped
for delays.
"""
if not session.logged_in:
self.data_in(session, text=[[CMD_LOGINSTART], {}])
[docs] def portal_connect(self, portalsessiondata):
"""
Called by Portal when a new session has connected.
Creates a new, unlogged-in game session.
Args:
portalsessiondata (dict): a dictionary of all property:value
keys defining the session and which is marked to be
synced.
"""
delayed_import()
global _ServerSession, _AccountDB, _ScriptDB
sess = _ServerSession()
sess.sessionhandler = self
sess.load_sync_data(portalsessiondata)
sess.at_sync()
# validate all scripts
_ScriptDB.objects.validate()
self[sess.sessid] = sess
if sess.logged_in and sess.uid:
# Session is already logged in. This can happen in the
# case of auto-authenticating protocols like SSH or
# webclient's session sharing
account = _AccountDB.objects.get_account_from_uid(sess.uid)
if account:
# this will set account.is_connected too
self.login(sess, account, force=True)
return
else:
sess.logged_in = False
sess.uid = None
# show the first login command, may delay slightly to allow
# the handshakes to finish.
delay(_DELAY_CMD_LOGINSTART, self._run_cmd_login, sess)
[docs] def portal_session_sync(self, portalsessiondata):
"""
Called by Portal when it wants to update a single session (e.g.
because of all negotiation protocols have finally replied)
Args:
portalsessiondata (dict): a dictionary of all property:value
keys defining the session and which is marked to be
synced.
"""
sessid = portalsessiondata.get("sessid")
session = self.get(sessid)
if session:
# since some of the session properties may have had
# a chance to change already before the portal gets here
# the portal doesn't send all sessiondata but only
# ones which should only be changed from portal (like
# protocol_flags etc)
session.load_sync_data(portalsessiondata)
[docs] def portal_sessions_sync(self, portalsessionsdata):
"""
Syncing all session ids of the portal with the ones of the
server. This is instantiated by the portal when reconnecting.
Args:
portalsessionsdata (dict): A dictionary
`{sessid: {property:value},...}` defining each session and
the properties in it which should be synced.
"""
delayed_import()
global _ServerSession, _AccountDB, _ServerConfig, _ScriptDB
for sess in list(self.values()):
# we delete the old session to make sure to catch eventual
# lingering references.
del sess
for sessid, sessdict in portalsessionsdata.items():
sess = _ServerSession()
sess.sessionhandler = self
sess.load_sync_data(sessdict)
if sess.uid:
sess.account = _AccountDB.objects.get_account_from_uid(sess.uid)
self[sessid] = sess
sess.at_sync()
mode = "reload"
# tell the server hook we synced
self.server.at_post_portal_sync(mode)
# announce the reconnection
self.announce_all(_(" ... Server restarted."))
[docs] def portal_disconnect(self, session):
"""
Called from Portal when Portal session closed from the portal
side. There is no message to report in this case.
Args:
session (Session): The Session to disconnect
"""
# disconnect us without calling Portal since
# Portal already knows.
self.disconnect(session, reason="", sync_portal=False)
[docs] def portal_disconnect_all(self):
"""
Called from Portal when Portal is closing down. All
Sessions should die. The Portal should not be informed.
"""
# set a watchdog to avoid self.disconnect from deleting
# the session while we are looping over them
self._disconnect_all = True
for session in self.values():
session.disconnect()
del self._disconnect_all
# server-side access methods
[docs] def start_bot_session(self, protocol_path, configdict):
"""
This method allows the server-side to force the Portal to
create a new bot session.
Args:
protocol_path (str): The full python path to the bot's
class.
configdict (dict): This dict will be used to configure
the bot (this depends on the bot protocol).
Examples:
start_bot_session("evennia.server.portal.irc.IRCClient",
{"uid":1, "botname":"evbot", "channel":"#evennia",
"network:"irc.freenode.net", "port": 6667})
Notes:
The new session will use the supplied account-bot uid to
initiate an already logged-in connection. The Portal will
treat this as a normal connection and henceforth so will
the Server.
"""
self.server.amp_protocol.send_AdminServer2Portal(
DUMMYSESSION, operation=SCONN, protocol_path=protocol_path, config=configdict
)
[docs] def portal_restart_server(self):
"""
Called by server when reloading. We tell the portal to start a new server instance.
"""
self.server.amp_protocol.send_AdminServer2Portal(DUMMYSESSION, operation=SRELOAD)
[docs] def portal_reset_server(self):
"""
Called by server when reloading. We tell the portal to start a new server instance.
"""
self.server.amp_protocol.send_AdminServer2Portal(DUMMYSESSION, operation=SRESET)
[docs] def portal_shutdown(self):
"""
Called by server when it's time to shut down (the portal will shut us down and then shut
itself down)
"""
self.server.amp_protocol.send_AdminServer2Portal(DUMMYSESSION, operation=PSHUTD)
[docs] def login(self, session, account, force=False, testmode=False):
"""
Log in the previously unloggedin session and the account we by
now should know is connected to it. After this point we assume
the session to be logged in one way or another.
Args:
session (Session): The Session to authenticate.
account (Account): The Account identified as associated with this Session.
force (bool): Login also if the session thinks it's already logged in
(this can happen for auto-authenticating protocols)
testmode (bool, optional): This is used by unittesting for
faking login without any AMP being actually active.
"""
if session.logged_in and not force:
# don't log in a session that is already logged in.
return
account.is_connected = True
# sets up and assigns all properties on the session
session.at_login(account)
# account init
account.at_init()
# Check if this is the first time the *account* logs in
if account.db.FIRST_LOGIN:
account.at_first_login()
del account.db.FIRST_LOGIN
account.at_pre_login()
if _MULTISESSION_MODE == 0:
# disconnect all previous sessions.
self.disconnect_duplicate_sessions(session)
nsess = len(self.sessions_from_account(account))
string = "Logged in: {account} {address} ({nsessions} session(s) total)"
string = string.format(account=account, address=session.address, nsessions=nsess)
session.log(string)
session.logged_in = True
# sync the portal to the session
if not testmode:
self.server.amp_protocol.send_AdminServer2Portal(
session, operation=SLOGIN, sessiondata={"logged_in": True, "uid": session.uid}
)
account.at_post_login(session=session)
if nsess < 2:
SIGNAL_ACCOUNT_POST_FIRST_LOGIN.send(sender=account, session=session)
SIGNAL_ACCOUNT_POST_LOGIN.send(sender=account, session=session)
[docs] def disconnect(self, session, reason="", sync_portal=True):
"""
Called from server side to remove session and inform portal
of this fact.
Args:
session (Session): The Session to disconnect.
reason (str, optional): A motivation for the disconnect.
sync_portal (bool, optional): Sync the disconnect to
Portal side. This should be done unless this was
called by self.portal_disconnect().
"""
session = self.get(session.sessid)
if not session:
return
if hasattr(session, "account") and session.account:
# only log accounts logging off
nsess = len(self.sessions_from_account(session.account)) - 1
sreason = " ({})".format(reason) if reason else ""
string = "Logged out: {account} {address} ({nsessions} sessions(s) remaining){reason}"
string = string.format(
reason=sreason, account=session.account, address=session.address, nsessions=nsess
)
session.log(string)
if nsess == 0:
SIGNAL_ACCOUNT_POST_LAST_LOGOUT.send(sender=session.account, session=session)
session.at_disconnect(reason)
SIGNAL_ACCOUNT_POST_LOGOUT.send(sender=session.account, session=session)
sessid = session.sessid
if sessid in self and not hasattr(self, "_disconnect_all"):
del self[sessid]
if sync_portal:
# inform portal that session should be closed.
self.server.amp_protocol.send_AdminServer2Portal(
session, operation=SDISCONN, reason=reason
)
[docs] def all_sessions_portal_sync(self):
"""
This is called by the server when it reboots. It syncs all session data
to the portal. Returns a deferred!
"""
sessdata = self.get_all_sync_data()
return self.server.amp_protocol.send_AdminServer2Portal(
DUMMYSESSION, operation=SSYNC, sessiondata=sessdata
)
[docs] def session_portal_sync(self, session):
"""
This is called by the server when it wants to sync a single session
with the Portal for whatever reason. Returns a deferred!
"""
sessdata = {session.sessid: session.get_sync_data()}
return self.server.amp_protocol.send_AdminServer2Portal(
DUMMYSESSION, operation=SSYNC, sessiondata=sessdata, clean=False
)
[docs] def session_portal_partial_sync(self, session_data):
"""
Call to make a partial update of the session, such as only a particular property.
Args:
session_data (dict): Store `{sessid: {property:value}, ...}` defining one or
more sessions in detail.
"""
return self.server.amp_protocol.send_AdminServer2Portal(
DUMMYSESSION, operation=SSYNC, sessiondata=session_data, clean=False
)
[docs] def disconnect_all_sessions(self, reason="You have been disconnected."):
"""
Cleanly disconnect all of the connected sessions.
Args:
reason (str, optional): The reason for the disconnection.
"""
for session in self:
del session
# tell portal to disconnect all sessions
self.server.amp_protocol.send_AdminServer2Portal(
DUMMYSESSION, operation=SDISCONNALL, reason=reason
)
[docs] def disconnect_duplicate_sessions(
self, curr_session, reason=_("Logged in from elsewhere. Disconnecting.")
):
"""
Disconnects any existing sessions with the same user.
args:
curr_session (Session): Disconnect all Sessions matching this one.
reason (str, optional): A motivation for disconnecting.
"""
uid = curr_session.uid
# we can't compare sessions directly since this will compare addresses and
# mean connecting from the same host would not catch duplicates
sid = id(curr_session)
doublet_sessions = [
sess for sess in self.values() if sess.logged_in and sess.uid == uid and id(sess) != sid
]
for session in doublet_sessions:
self.disconnect(session, reason)
[docs] def validate_sessions(self):
"""
Check all currently connected sessions (logged in and not) and
see if any are dead or idle.
"""
tcurr = time.time()
reason = _("Idle timeout exceeded, disconnecting.")
for session in (
session
for session in self.values()
if session.logged_in
and _IDLE_TIMEOUT > 0
and (tcurr - session.cmd_last) > _IDLE_TIMEOUT
):
self.disconnect(session, reason=reason)
[docs] def account_count(self):
"""
Get the number of connected accounts (not sessions since a
account may have more than one session depending on settings).
Only logged-in accounts are counted here.
Returns:
naccount (int): Number of connected accounts
"""
return len(set(session.uid for session in self.values() if session.logged_in))
[docs] def all_connected_accounts(self):
"""
Get a unique list of connected and logged-in Accounts.
Returns:
accounts (list): All connected Accounts (which may be fewer than the
amount of Sessions due to multi-playing).
"""
return list(
set(
session.account
for session in self.values()
if session.logged_in and session.account
)
)
[docs] def session_from_sessid(self, sessid):
"""
Get session based on sessid, or None if not found
Args:
sessid (int or list): Session id(s).
Return:
sessions (Session or list): Session(s) found. This
is a list if input was a list.
"""
if is_iter(sessid):
return [self.get(sid) for sid in sessid if sid in self]
return self.get(sessid)
[docs] def session_from_account(self, account, sessid):
"""
Given an account and a session id, return the actual session
object.
Args:
account (Account): The Account to get the Session from.
sessid (int or list): Session id(s).
Returns:
sessions (Session or list): Session(s) found.
"""
sessions = [
self[sid]
for sid in make_iter(sessid)
if sid in self and self[sid].logged_in and account.uid == self[sid].uid
]
return sessions[0] if len(sessions) == 1 else sessions
[docs] def sessions_from_account(self, account):
"""
Given an account, return all matching sessions.
Args:
account (Account): Account to get sessions from.
Returns:
sessions (list): All Sessions associated with this account.
"""
uid = account.uid
return [session for session in self.values() if session.logged_in and session.uid == uid]
[docs] def sessions_from_puppet(self, puppet):
"""
Given a puppeted object, return all controlling sessions.
Args:
puppet (Object): Object puppeted
Returns.
sessions (Session or list): Can be more than one of Object is controlled by
more than one Session (MULTISESSION_MODE > 1).
"""
sessions = puppet.sessid.get()
return sessions[0] if len(sessions) == 1 else sessions
sessions_from_character = sessions_from_puppet
[docs] def sessions_from_csessid(self, csessid):
"""
Given a client identification hash (for session types that offer them)
return all sessions with a matching hash.
Args:
csessid (str): The session hash.
Returns:
sessions (list): The sessions with matching .csessid, if any.
"""
if csessid:
return []
return [
session for session in self.values() if session.csessid and session.csessid == csessid
]
[docs] def announce_all(self, message):
"""
Send message to all connected sessions
Args:
message (str): Message to send.
"""
for session in self.values():
self.data_out(session, text=message)
[docs] def data_out(self, session, **kwargs):
"""
Sending data Server -> Portal
Args:
session (Session): Session to relay to.
text (str, optional): text data to return
Notes:
The outdata will be scrubbed for sending across
the wire here.
"""
# clean output for sending
kwargs = self.clean_senddata(session, kwargs)
# send across AMP
self.server.amp_protocol.send_MsgServer2Portal(session, **kwargs)
[docs] def data_in(self, session, **kwargs):
"""
We let the data take a "detour" to session.data_in
so the user can override and see it all in one place.
That method is responsible to in turn always call
this class' `sessionhandler.call_inputfunc` with the
(possibly processed) data.
"""
if session:
session.data_in(**kwargs)
SESSION_HANDLER = ServerSessionHandler()
SESSIONS = SESSION_HANDLER # legacy
