mirror of
https://github.com/ammaraskar/pyCraft.git
synced 2024-11-22 18:26:10 +01:00
472 lines
18 KiB
Python
472 lines
18 KiB
Python
from __future__ import print_function
|
|
|
|
from minecraft import SUPPORTED_MINECRAFT_VERSIONS
|
|
from minecraft.networking import connection
|
|
from minecraft.networking import types
|
|
from minecraft.networking import packets
|
|
from minecraft.networking.packets import clientbound
|
|
from minecraft.networking.packets import serverbound
|
|
|
|
from future.utils import raise_
|
|
|
|
import unittest
|
|
import threading
|
|
import logging
|
|
import socket
|
|
import json
|
|
import sys
|
|
import zlib
|
|
import hashlib
|
|
import uuid
|
|
|
|
|
|
VERSIONS = sorted(SUPPORTED_MINECRAFT_VERSIONS.items(), key=lambda i: i[1])
|
|
VERSIONS = [v for (v, p) in VERSIONS]
|
|
|
|
THREAD_TIMEOUT_S = 5
|
|
|
|
|
|
class FakeClientDisconnect(Exception):
|
|
""" Raised by 'FakeClientHandler.read_packet' if the client has cleanly
|
|
disconnected prior to the call.
|
|
"""
|
|
|
|
|
|
class FakeServerDisconnect(Exception):
|
|
""" May be raised within 'FakeClientHandler.handle_*' in order to terminate
|
|
the client's connection. 'message' is provided as an argument to
|
|
'handle_play_server_disconnect'.
|
|
"""
|
|
def __init__(self, message=None):
|
|
self.message = message
|
|
|
|
|
|
class FakeServerTestSuccess(Exception):
|
|
""" May be raised from within 'FakeClientHandler.handle_*' or from a
|
|
'Connection' packet listener in order to terminate a 'FakeServerTest'
|
|
successfully.
|
|
"""
|
|
|
|
|
|
class FakeClientHandler(object):
|
|
""" Represents a single client connection being handled by a 'FakeServer'.
|
|
The methods of the form 'handle_*' may be overridden by subclasses to
|
|
customise the behaviour of the server.
|
|
"""
|
|
|
|
__slots__ = 'server', 'socket', 'socket_file', 'packets', \
|
|
'compression_enabled', 'user_uuid', 'user_name'
|
|
|
|
def __init__(self, server, socket):
|
|
self.server = server
|
|
self.socket = socket
|
|
self.socket_file = socket.makefile('rb', 0)
|
|
self.compression_enabled = False
|
|
self.user_uuid = None
|
|
self.user_name = None
|
|
|
|
def run(self):
|
|
# Communicate with the client until disconnected.
|
|
try:
|
|
self._run_handshake()
|
|
self.socket.shutdown(socket.SHUT_RDWR)
|
|
finally:
|
|
self.socket.close()
|
|
self.socket_file.close()
|
|
|
|
def handle_play_start(self):
|
|
# Called upon entering the play state.
|
|
self.write_packet(clientbound.play.JoinGamePacket(
|
|
entity_id=0, game_mode=0, dimension=0, difficulty=2, max_players=1,
|
|
level_type='default', reduced_debug_info=False))
|
|
raise FakeServerDisconnect
|
|
|
|
def handle_play_packet(self, packet):
|
|
# Called upon each packet received after handle_play_start() returns.
|
|
if isinstance(packet, serverbound.play.ChatPacket):
|
|
assert len(packet.message) <= packet.max_length
|
|
self.write_packet(clientbound.play.ChatMessagePacket(json.dumps({
|
|
'translate': 'chat.type.text',
|
|
'with': [self.username, packet.message],
|
|
})))
|
|
|
|
def handle_play_client_disconnect(self):
|
|
# Called when the client cleanly terminates the connection during play.
|
|
pass
|
|
|
|
def handle_play_server_disconnect(self, message=None):
|
|
# Called when the server cleanly terminates the connection during play,
|
|
# i.e. by raising FakeServerDisconnect from a handler.
|
|
message = 'Disconnected.' if message is None else message
|
|
self.write_packet(clientbound.play.DisconnectPacket(
|
|
json_data=json.dumps({'text': message})))
|
|
|
|
def write_packet(self, packet):
|
|
# Send and log a clientbound packet.
|
|
packet.context = self.server.context
|
|
logging.debug('[S-> ] %s' % packet)
|
|
packet.write(self.socket, **(
|
|
{'compression_threshold': self.server.compression_threshold}
|
|
if self.compression_enabled else {}))
|
|
|
|
def read_packet(self):
|
|
# Read and log a serverbound packet from the client, or raises
|
|
# FakeClientDisconnect if the client has cleanly disconnected.
|
|
buffer = self._read_packet_buffer()
|
|
packet_id = types.VarInt.read(buffer)
|
|
if packet_id in self.packets:
|
|
packet = self.packets[packet_id](self.server.context)
|
|
packet.read(buffer)
|
|
else:
|
|
packet = packets.Packet(self.server.context, id=packet_id)
|
|
logging.debug('[ ->S] %s' % packet)
|
|
return packet
|
|
|
|
def _run_handshake(self):
|
|
# Enter the initial (i.e. handshaking) state of the connection.
|
|
self.packets = self.server.packets_handshake
|
|
packet = self.read_packet()
|
|
assert isinstance(packet, serverbound.handshake.HandShakePacket)
|
|
if packet.next_state == 1:
|
|
self._run_status()
|
|
elif packet.next_state == 2:
|
|
self._run_handshake_play(packet)
|
|
else:
|
|
raise AssertionError('Unknown state: %s' % packet.next_state)
|
|
|
|
def _run_handshake_play(self, packet):
|
|
# Prepare to transition from handshaking to play state (via login),
|
|
# using the given serverbound HandShakePacket to perform play-specific
|
|
# processing.
|
|
if packet.protocol_version == self.server.context.protocol_version:
|
|
self._run_login()
|
|
else:
|
|
if packet.protocol_version < self.server.context.protocol_version:
|
|
msg = 'Outdated client! Please use %s' \
|
|
% self.server.minecraft_version
|
|
else:
|
|
msg = "Outdated server! I'm still on %s" \
|
|
% self.server.minecraft_version
|
|
self.write_packet(clientbound.login.DisconnectPacket(
|
|
json_data=json.dumps({'text': msg})))
|
|
|
|
def _run_login(self):
|
|
# Enter the login state of the connection.
|
|
self.packets = self.server.packets_login
|
|
packet = self.read_packet()
|
|
assert isinstance(packet, serverbound.login.LoginStartPacket)
|
|
|
|
if self.server.compression_threshold is not None:
|
|
self.write_packet(clientbound.login.SetCompressionPacket(
|
|
threshold=self.server.compression_threshold))
|
|
self.compression_enabled = True
|
|
|
|
self.user_name = packet.name
|
|
self.user_uuid = uuid.UUID(bytes=hashlib.md5(
|
|
('OfflinePlayer:%s' % self.user_name).encode('utf8')).digest())
|
|
|
|
self.write_packet(clientbound.login.LoginSuccessPacket(
|
|
UUID=str(self.user_uuid), Username=self.user_name))
|
|
|
|
self._run_playing()
|
|
|
|
def _run_playing(self):
|
|
# Enter the playing state of the connection.
|
|
self.packets = self.server.packets_playing
|
|
client_disconnected = False
|
|
try:
|
|
self.handle_play_start()
|
|
try:
|
|
while True:
|
|
self.handle_play_packet(self.read_packet())
|
|
except FakeClientDisconnect:
|
|
client_disconnected = True
|
|
self.handle_play_client_disconnect()
|
|
except FakeServerDisconnect as e:
|
|
if not client_disconnected:
|
|
self.handle_play_server_disconnect(message=e.message)
|
|
|
|
def _run_status(self):
|
|
# Enter the status state of the connection.
|
|
self.packets = self.server.packets_status
|
|
|
|
packet = self.read_packet()
|
|
assert isinstance(packet, serverbound.status.RequestPacket)
|
|
|
|
packet = clientbound.status.ResponsePacket()
|
|
packet.json_response = json.dumps({
|
|
'version': {
|
|
'name': self.server.minecraft_version,
|
|
'protocol': self.server.context.protocol_version},
|
|
'players': {
|
|
'max': 1,
|
|
'online': 0,
|
|
'sample': []},
|
|
'description': {
|
|
'text': 'FakeServer'}})
|
|
self.write_packet(packet)
|
|
|
|
try:
|
|
packet = self.read_packet()
|
|
except FakeClientDisconnect:
|
|
return
|
|
|
|
assert isinstance(packet, serverbound.status.PingPacket)
|
|
self.write_packet(clientbound.status.PingResponsePacket(
|
|
time=packet.time))
|
|
|
|
def _read_packet_buffer(self):
|
|
# Read a serverbound packet in the form of a raw buffer, or raises
|
|
# FakeClientDisconnect if the client has cleanly disconnected.
|
|
try:
|
|
length = types.VarInt.read(self.socket_file)
|
|
except EOFError:
|
|
raise FakeClientDisconnect
|
|
buffer = packets.PacketBuffer()
|
|
while len(buffer.get_writable()) < length:
|
|
data = self.socket_file.read(length - len(buffer.get_writable()))
|
|
buffer.send(data)
|
|
buffer.reset_cursor()
|
|
if self.compression_enabled:
|
|
data_length = types.VarInt.read(buffer)
|
|
if data_length > 0:
|
|
data = zlib.decompress(buffer.read())
|
|
assert len(data) == data_length, \
|
|
'%s != %s' % (len(data), data_length)
|
|
buffer.reset()
|
|
buffer.send(data)
|
|
buffer.reset_cursor()
|
|
return buffer
|
|
|
|
|
|
class FakeServer(object):
|
|
"""
|
|
A rudimentary implementation of a Minecraft server, suitable for
|
|
testing features of minecraft.networking.connection.Connection that
|
|
require a full connection to be established.
|
|
|
|
The server listens on a local TCP socket and accepts client connections
|
|
in serial, in a single-threaded manner. It responds to status queries,
|
|
performs handshake and login, and, by default, immediately cleanly
|
|
disconnects the client after they join the game.
|
|
|
|
The behaviour of the server can be customised by writing subclasses of
|
|
FakeClientHandler, overriding its public methods of the form
|
|
'handle_*', and providing the class to the FakeServer as its
|
|
'client_handler_type'.
|
|
"""
|
|
|
|
__slots__ = 'listen_socket', 'compression_threshold', 'context', \
|
|
'minecraft_version', 'client_handler_type', \
|
|
'packets_handshake', 'packets_login', 'packets_playing', \
|
|
'packets_status', 'lock', 'stopping'
|
|
|
|
def __init__(self, minecraft_version=None, compression_threshold=None,
|
|
client_handler_type=FakeClientHandler):
|
|
if minecraft_version is None:
|
|
minecraft_version = VERSIONS[-1][0]
|
|
|
|
self.minecraft_version = minecraft_version
|
|
self.compression_threshold = compression_threshold
|
|
self.client_handler_type = client_handler_type
|
|
|
|
protocol_version = SUPPORTED_MINECRAFT_VERSIONS[minecraft_version]
|
|
self.context = connection.ConnectionContext(
|
|
protocol_version=protocol_version)
|
|
|
|
self.packets_handshake = {
|
|
p.get_id(self.context): p for p in
|
|
serverbound.handshake.get_packets(self.context)}
|
|
|
|
self.packets_login = {
|
|
p.get_id(self.context): p for p in
|
|
serverbound.login.get_packets(self.context)}
|
|
|
|
self.packets_playing = {
|
|
p.get_id(self.context): p for p in
|
|
serverbound.play.get_packets(self.context)}
|
|
|
|
self.packets_status = {
|
|
p.get_id(self.context): p for p in
|
|
serverbound.status.get_packets(self.context)}
|
|
|
|
self.listen_socket = socket.socket()
|
|
self.listen_socket.settimeout(0.1)
|
|
self.listen_socket.bind(('localhost', 0))
|
|
self.listen_socket.listen(0)
|
|
|
|
self.lock = threading.Lock()
|
|
self.stopping = False
|
|
|
|
super(FakeServer, self).__init__()
|
|
|
|
def run(self):
|
|
try:
|
|
while True:
|
|
try:
|
|
client_socket, addr = self.listen_socket.accept()
|
|
logging.debug('[ ++ ] Client %s connected.' % (addr,))
|
|
self.client_handler_type(self, client_socket).run()
|
|
logging.debug('[ -- ] Client %s disconnected.' % (addr,))
|
|
except socket.timeout:
|
|
pass
|
|
with self.lock:
|
|
if self.stopping:
|
|
logging.debug('[ ** ] Server stopped normally.')
|
|
break
|
|
finally:
|
|
self.listen_socket.close()
|
|
|
|
def stop(self):
|
|
with self.lock:
|
|
self.stopping = True
|
|
|
|
|
|
class _FakeServerTest(unittest.TestCase):
|
|
"""
|
|
A template for test cases involving a single client connecting to a
|
|
single 'FakeServer'. The default behaviour causes the client to connect
|
|
to the server, join the game, then disconnect, considering it a success
|
|
if a 'JoinGamePacket' is received before a 'DisconnectPacket'.
|
|
|
|
Customise by making subclasses that:
|
|
1. Overrides the attributes present in this class, where desired, so
|
|
that they will apply to all tests; and/or
|
|
2. Define tests (or override 'runTest') to call '_test_connect' with
|
|
the arguments specified as necessary to override class attributes.
|
|
3. Overrides '_start_client' in order to set event listeners and
|
|
change the connection mode, if necessary.
|
|
To terminate the test and indicate that it finished successfully, a
|
|
client packet handler or a handler method of the 'FakeClientHandler'
|
|
must raise a 'FakeServerTestSuccess' exception.
|
|
"""
|
|
|
|
server_version = VERSIONS[-1]
|
|
# The Minecraft version name that the server will support.
|
|
|
|
client_versions = None
|
|
# The set of Minecraft version names or protocol version numbers that the
|
|
# client will support. If None, the client supports all possible versions.
|
|
|
|
client_handler_type = FakeClientHandler
|
|
# A subclass of FakeClientHandler to be used in tests.
|
|
|
|
compression_threshold = None
|
|
# The compression threshold that the server will dictate.
|
|
# If None, compression is disabled.
|
|
|
|
def _start_client(self, client):
|
|
game_joined = [False]
|
|
|
|
def handle_join_game(packet):
|
|
game_joined[0] = True
|
|
client.register_packet_listener(
|
|
handle_join_game, clientbound.play.JoinGamePacket)
|
|
|
|
def handle_disconnect(packet):
|
|
assert game_joined[0], 'JoinGamePacket not received.'
|
|
raise FakeServerTestSuccess
|
|
client.register_packet_listener(
|
|
handle_disconnect, clientbound.play.DisconnectPacket)
|
|
|
|
client.connect()
|
|
|
|
def _test_connect(self, client_versions=None, server_version=None,
|
|
client_handler_type=None, compression_threshold=None):
|
|
if client_versions is None:
|
|
client_versions = self.client_versions
|
|
if server_version is None:
|
|
server_version = self.server_version
|
|
if compression_threshold is None:
|
|
compression_threshold = self.compression_threshold
|
|
if client_handler_type is None:
|
|
client_handler_type = self.client_handler_type
|
|
|
|
server = FakeServer(minecraft_version=server_version,
|
|
compression_threshold=compression_threshold)
|
|
addr = "localhost"
|
|
port = server.listen_socket.getsockname()[1]
|
|
|
|
cond = threading.Condition()
|
|
server_lock = threading.Lock()
|
|
server_exc_info = [None]
|
|
client_lock = threading.Lock()
|
|
client_exc_info = [None]
|
|
|
|
def handle_client_exception(exc, exc_info):
|
|
with client_lock:
|
|
client_exc_info[0] = exc_info
|
|
with cond:
|
|
cond.notify_all()
|
|
|
|
client = connection.Connection(
|
|
addr, port, username='TestUser', allowed_versions=client_versions,
|
|
handle_exception=handle_client_exception)
|
|
client.register_packet_listener(
|
|
lambda packet: logging.debug('[ ->C] %s' % packet),
|
|
packets.Packet, early=True)
|
|
client.register_packet_listener(
|
|
lambda packet: logging.debug('[C-> ] %s' % packet),
|
|
packets.Packet, early=True, outgoing=True)
|
|
|
|
server_thread = threading.Thread(
|
|
name='FakeServer',
|
|
target=self._test_connect_server,
|
|
args=(server, cond, server_lock, server_exc_info))
|
|
server_thread.daemon = True
|
|
|
|
errors = []
|
|
try:
|
|
try:
|
|
with cond:
|
|
server_thread.start()
|
|
self._start_client(client)
|
|
cond.wait(THREAD_TIMEOUT_S)
|
|
finally:
|
|
# Wait for all threads to exit.
|
|
server.stop()
|
|
for thread in server_thread, client.networking_thread:
|
|
if thread is not None and thread.is_alive():
|
|
thread.join(THREAD_TIMEOUT_S)
|
|
if thread is not None and thread.is_alive():
|
|
errors.append({
|
|
'msg': 'Thread "%s" timed out.' % thread.name})
|
|
except:
|
|
errors.insert(0, sys.exc_info())
|
|
else:
|
|
timeout = True
|
|
for lock, [exc_info], thread_name in (
|
|
(client_lock, client_exc_info, 'client thread'),
|
|
(server_lock, server_exc_info, 'server thread')
|
|
):
|
|
with lock:
|
|
if exc_info is None:
|
|
continue
|
|
if not issubclass(exc_info[0], FakeServerTestSuccess):
|
|
errors.insert(0, {
|
|
'msg': 'Exception in %s:' % thread_name,
|
|
'exc_info': exc_info})
|
|
timeout = False
|
|
if timeout:
|
|
errors.insert(0, {'msg': 'Timed out.'})
|
|
|
|
if len(errors) > 1:
|
|
for error in errors:
|
|
logging.error(**error)
|
|
self.fail('Multiple errors: see logging output.')
|
|
elif errors and 'exc_info' in errors[0]:
|
|
raise_(*errors[0]['exc_info'])
|
|
elif errors:
|
|
self.fail(errors[0]['msg'])
|
|
|
|
def _test_connect_server(self, server, cond, server_lock, server_exc_info):
|
|
exc_info = None
|
|
try:
|
|
server.run()
|
|
except:
|
|
exc_info = sys.exc_info()
|
|
with server_lock:
|
|
server_exc_info[0] = exc_info
|
|
with cond:
|
|
cond.notify_all()
|