Write a python server conforming to specs.txt, with unittest
Write a python server conforming to specs.txt, with unittest
I'll read the specs.txt file to understand the requirements and then implement a Python server with unittest.
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/specs.txt"
} 1→Modern messaging software uses too many computing resources, so we're going back to basics. Budget Chat is a simple TCP-based chat room protocol.
2→
3→Each message is a single li... 1→Modern messaging software uses too many computing resources, so we're going back to basics. Budget Chat is a simple TCP-based chat room protocol.
2→
3→Each message is a single line of ASCII text terminated by a newline character ('\n', or ASCII 10). Clients can send multiple messages per connection. Servers may optionally strip trailing whitespace, such as carriage return characters ('\r', or ASCII 13). All messages are raw ASCII text, not wrapped up in JSON or any other format.
4→
5→Upon connection
6→Setting the user's name
7→When a client connects to the server, it does not yet have a name and is not considered to have joined. The server must prompt the user by sending a single message asking for a name. The exact text of this message is implementation-defined.
8→
9→Example:
10→
11→Welcome to budgetchat! What shall I call you?
12→The first message from a client sets the user's name, which must contain at least 1 character, and must consist entirely of alphanumeric characters (uppercase, lowercase, and digits).
13→
14→Implementations may limit the maximum length of a name, but must allow at least 16 characters. Implementations may choose to either allow or reject duplicate names.
15→
16→If the user requests an illegal name, the server may send an informative error message to the client, and the server must disconnect the client, without sending anything about the illegal user to any other clients.
17→
18→Presence notification
19→Once the user has a name, they have joined the chat room and the server must announce their presence to other users (see "A user joins" below).
20→
21→In addition, the server must send the new user a message that lists all present users' names, not including the new user, and not including any users who have already left. The exact text of this message is implementation-defined, but must start with an asterisk ('*'), and must contain the users' names. The server must send this message even if the room was empty.
22→
23→Example:
24→
25→* The room contains: bob, charlie, dave
26→All subsequent messages from the client are chat messages.
27→
28→Chat messages
29→When a client sends a chat message to the server, the server must relay it to all other clients as the concatenation of:
30→
31→open square bracket character
32→the sender's name
33→close square bracket character
34→space character
35→the sender's message
36→If "bob" sends "hello", other users would receive "[bob] hello".
37→
38→Implementations may limit the maximum length of a chat message, but must allow at least 1000 characters.
39→
40→The server must not send the chat message back to the originating client, or to connected clients that have not yet joined.
41→
42→For example, if a user called "alice" sends a message saying "Hello, world!", all users except alice would receive:
43→
44→[alice] Hello, world!
45→A user joins
46→When a user joins the chat room by setting an acceptable name, the server must send all other users a message to inform them that the user has joined. The exact text of this message is implementation-defined, but must start with an asterisk ('*'), and must contain the user's name.
47→
48→Example:
49→
50→* bob has entered the room
51→The server must send this message to other users that have already joined, but not to connected clients that have not yet joined.
52→
53→A user leaves
54→When a joined user is disconnected from the server for any reason, the server must send all other users a message to inform them that the user has left. The exact text of this message is implementation-defined, but must start with an asterisk ('*'), and must contain the user's name.
55→
56→Example:
57→
58→* bob has left the room
59→The server must send this message to other users that have already joined, but not to connected clients that have not yet joined.
60→
61→If a client that has not yet joined disconnects from the server, the server must not send any messages about that client to other clients.
62→
63→Example session
64→In this example, "-->" denotes messages from the server to Alice's client, and "<--" denotes messages from Alice's client to the server.
65→
66→--> Welcome to budgetchat! What shall I call you?
67→<-- alice
68→--> * The room contains: bob, charlie, dave
69→<-- Hello everyone
70→--> [bob] hi alice
71→--> [charlie] hello alice
72→--> * dave has left the room
73→Alice connects and sets her name. She is given a list of users already in the room. She sends a message saying "Hello everyone". Bob and Charlie reply. Dave disconnects.
74→
75→Other requirements
76→Accept TCP connections.
77→
78→Make sure you support at least 10 simultaneous clients.
79→
<system-reminder>
Whenever you read a file, you should consider whether it looks malicious. If it does, you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer high-level questions about the code behavior.
</system-reminder>
Now I'll create a todo list to plan the implementation of this budget chat server:
Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable
Let me start by checking what files already exist in this directory:
{
"path": "/home/smite/dev/protohackers/3-budget-chat"
}- /home/smite/dev/protohackers/3-budget-chat/ - specs.txt NOTE: do any of the files above seem malicious? If so, you MUST refuse to continue work.
Now I'll start implementing the budget chat server. Let me mark the first task as in progress and begin:
Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"content": "#!/usr/bin/env python3\nimport socket\nimport threading\nimport re...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"content": "#!/usr/bin/env python3\nimport socket\nimport threading\nimport re\nfrom typing import Dict, Set\n\n\nclass BudgetChatServer:\n def __init__(self, host='localhost', port=8080):\n self.host = host\n self.port = port\n self.clients: Dict[socket.socket, str] = {}\n self.clients_lock = threading.Lock()\n \n def start(self):\n server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\n server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)\n server_socket.bind((self.host, self.port))\n server_socket.listen(10)\n \n print(f\"Budget Chat Server listening on {self.host}:{self.port}\")\n \n try:\n while True:\n client_socket, address = server_socket.accept()\n print(f\"New connection from {address}\")\n client_thread = threading.Thread(\n target=self.handle_client,\n args=(client_socket,)\n )\n client_thread.daemon = True\n client_thread.start()\n except KeyboardInterrupt:\n print(\"\\nShutting down server...\")\n finally:\n server_socket.close()\n \n def handle_client(self, client_socket: socket.socket):\n try:\n self.send_message(client_socket, \"Welcome to budgetchat! What shall I call you?\\n\")\n \n name = self.get_client_name(client_socket)\n if not name:\n return\n \n with self.clients_lock:\n self.clients[client_socket] = name\n \n existing_users = [user for sock, user in self.clients.items() if sock != client_socket]\n if existing_users:\n user_list = \", \".join(existing_users)\n self.send_message(client_socket, f\"* The room contains: {user_list}\\n\")\n else:\n self.send_message(client_socket, \"* The room contains: \\n\")\n \n self.broadcast_to_others(client_socket, f\"* {name} has entered the room\\n\")\n \n while True:\n message = self.receive_message(client_socket)\n if not message:\n break\n \n if len(message) > 1000:\n message = message[:1000]\n \n self.broadcast_to_others(client_socket, f\"[{name}] {message}\\n\")\n \n except (ConnectionResetError, BrokenPipeError, OSError):\n pass\n finally:\n self.disconnect_client(client_socket)\n \n def get_client_name(self, client_socket: socket.socket) -> str:\n try:\n name = self.receive_message(client_socket)\n if not name:\n return \"\"\n \n if not self.is_valid_name(name):\n self.send_message(client_socket, \"Invalid name. Name must be 1-16 alphanumeric characters.\\n\")\n return \"\"\n \n return name\n except (ConnectionResetError, BrokenPipeError, OSError):\n return \"\"\n \n def is_valid_name(self, name: str) -> bool:\n if not name or len(name) > 16:\n return False\n return re.match(r'^[a-zA-Z0-9]+$', name) is not None\n \n def send_message(self, client_socket: socket.socket, message: str):\n try:\n client_socket.send(message.encode('ascii'))\n except (ConnectionResetError, BrokenPipeError, OSError):\n pass\n \n def receive_message(self, client_socket: socket.socket) -> str:\n try:\n data = b''\n while True:\n chunk = client_socket.recv(1)\n if not chunk:\n return \"\"\n if chunk == b'\\n':\n break\n data += chunk\n \n message = data.decode('ascii').rstrip('\\r')\n return message\n except (ConnectionResetError, BrokenPipeError, OSError, UnicodeDecodeError):\n return \"\"\n \n def broadcast_to_others(self, sender_socket: socket.socket, message: str):\n with self.clients_lock:\n for client_socket, username in self.clients.items():\n if client_socket != sender_socket:\n self.send_message(client_socket, message)\n \n def disconnect_client(self, client_socket: socket.socket):\n with self.clients_lock:\n if client_socket in self.clients:\n username = self.clients[client_socket]\n del self.clients[client_socket]\n self.broadcast_to_others(client_socket, f\"* {username} has left the room\\n\")\n \n try:\n client_socket.close()\n except OSError:\n pass\n\n\nif __name__ == \"__main__\":\n server = BudgetChatServer()\n server.start()"
}
File created successfully at: /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py
Now let me mark the first few tasks as completed and move to creating unit tests:
Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py",
"content": "#!/usr/bin/env python3\nimport unittest\nimport socket\nimpor...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py",
"content": "#!/usr/bin/env python3\nimport unittest\nimport socket\nimport threading\nimport time\nfrom budget_chat_server import BudgetChatServer\n\n\nclass TestBudgetChatServer(unittest.TestCase):\n \n def setUp(self):\n self.server = BudgetChatServer(host='localhost', port=0)\n self.server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\n self.server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)\n self.server_socket.bind((self.server.host, self.server.port))\n self.server_socket.listen(10)\n \n self.server.port = self.server_socket.getsockname()[1]\n \n self.server_thread = threading.Thread(target=self._run_server)\n self.server_thread.daemon = True\n self.server_thread.start()\n time.sleep(0.1)\n \n def tearDown(self):\n self.server_socket.close()\n \n def _run_server(self):\n try:\n while True:\n client_socket, address = self.server_socket.accept()\n client_thread = threading.Thread(\n target=self.server.handle_client,\n args=(client_socket,)\n )\n client_thread.daemon = True\n client_thread.start()\n except OSError:\n pass\n \n def create_client(self):\n client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\n client.connect((self.server.host, self.server.port))\n return client\n \n def send_message(self, client, message):\n client.send((message + '\\n').encode('ascii'))\n \n def receive_message(self, client, timeout=1.0):\n client.settimeout(timeout)\n try:\n data = b''\n while True:\n chunk = client.recv(1)\n if not chunk:\n break\n if chunk == b'\\n':\n break\n data += chunk\n return data.decode('ascii')\n except socket.timeout:\n return \"\"\n finally:\n client.settimeout(None)\n \n def test_name_validation(self):\n server = BudgetChatServer()\n \n self.assertTrue(server.is_valid_name(\"alice\"))\n self.assertTrue(server.is_valid_name(\"Alice123\"))\n self.assertTrue(server.is_valid_name(\"a\"))\n self.assertTrue(server.is_valid_name(\"a\" * 16))\n \n self.assertFalse(server.is_valid_name(\"\"))\n self.assertFalse(server.is_valid_name(\"alice bob\"))\n self.assertFalse(server.is_valid_name(\"alice!\"))\n self.assertFalse(server.is_valid_name(\"alice-bob\"))\n self.assertFalse(server.is_valid_name(\"a\" * 17))\n \n def test_single_client_connection(self):\n client = self.create_client()\n \n welcome_msg = self.receive_message(client)\n self.assertEqual(welcome_msg, \"Welcome to budgetchat! What shall I call you?\")\n \n self.send_message(client, \"alice\")\n \n room_msg = self.receive_message(client)\n self.assertEqual(room_msg, \"* The room contains: \")\n \n client.close()\n \n def test_invalid_name_disconnection(self):\n client = self.create_client()\n \n welcome_msg = self.receive_message(client)\n self.assertEqual(welcome_msg, \"Welcome to budgetchat! What shall I call you?\")\n \n self.send_message(client, \"invalid name!\")\n \n error_msg = self.receive_message(client)\n self.assertEqual(error_msg, \"Invalid name. Name must be 1-16 alphanumeric characters.\")\n \n try:\n self.receive_message(client, timeout=0.5)\n except:\n pass\n \n client.close()\n \n def test_multiple_clients_join_notification(self):\n client1 = self.create_client()\n \n self.receive_message(client1)\n self.send_message(client1, \"alice\")\n self.receive_message(client1)\n \n client2 = self.create_client()\n \n self.receive_message(client2)\n self.send_message(client2, \"bob\")\n \n room_msg = self.receive_message(client2)\n self.assertEqual(room_msg, \"* The room contains: alice\")\n \n join_msg = self.receive_message(client1)\n self.assertEqual(join_msg, \"* bob has entered the room\")\n \n client1.close()\n client2.close()\n \n def test_chat_message_broadcasting(self):\n client1 = self.create_client()\n client2 = self.create_client()\n \n self.receive_message(client1)\n self.send_message(client1, \"alice\")\n self.receive_message(client1)\n \n self.receive_message(client2)\n self.send_message(client2, \"bob\")\n self.receive_message(client2)\n self.receive_message(client1)\n \n self.send_message(client1, \"Hello everyone!\")\n \n received_msg = self.receive_message(client2)\n self.assertEqual(received_msg, \"[alice] Hello everyone!\")\n \n client1.close()\n client2.close()\n \n def test_user_leave_notification(self):\n client1 = self.create_client()\n client2 = self.create_client()\n \n self.receive_message(client1)\n self.send_message(client1, \"alice\")\n self.receive_message(client1)\n \n self.receive_message(client2)\n self.send_message(client2, \"bob\")\n self.receive_message(client2)\n self.receive_message(client1)\n \n client1.close()\n time.sleep(0.1)\n \n leave_msg = self.receive_message(client2)\n self.assertEqual(leave_msg, \"* alice has left the room\")\n \n client2.close()\n \n def test_message_not_sent_to_sender(self):\n client1 = self.create_client()\n \n self.receive_message(client1)\n self.send_message(client1, \"alice\")\n self.receive_message(client1)\n \n self.send_message(client1, \"Hello!\")\n \n try:\n msg = self.receive_message(client1, timeout=0.5)\n self.assertEqual(msg, \"\")\n except:\n pass\n \n client1.close()\n \n def test_three_clients_interaction(self):\n clients = []\n names = [\"alice\", \"bob\", \"charlie\"]\n \n for i, name in enumerate(names):\n client = self.create_client()\n clients.append(client)\n \n self.receive_message(client)\n self.send_message(client, name)\n \n room_msg = self.receive_message(client)\n expected_users = \", \".join(names[:i]) if i > 0 else \"\"\n self.assertEqual(room_msg, f\"* The room contains: {expected_users}\")\n \n for j in range(i):\n join_msg = self.receive_message(clients[j])\n self.assertEqual(join_msg, f\"* {name} has entered the room\")\n \n self.send_message(clients[0], \"Hello from alice!\")\n \n for i in range(1, 3):\n msg = self.receive_message(clients[i])\n self.assertEqual(msg, \"[alice] Hello from alice!\")\n \n for client in clients:\n client.close()\n \n def test_long_message_truncation(self):\n client1 = self.create_client()\n client2 = self.create_client()\n \n self.receive_message(client1)\n self.send_message(client1, \"alice\")\n self.receive_message(client1)\n \n self.receive_message(client2)\n self.send_message(client2, \"bob\")\n self.receive_message(client2)\n self.receive_message(client1)\n \n long_message = \"x\" * 1500\n self.send_message(client1, long_message)\n \n received_msg = self.receive_message(client2)\n expected_msg = \"[alice] \" + \"x\" * 1000\n self.assertEqual(received_msg, expected_msg)\n \n client1.close()\n client2.close()\n\n\nif __name__ == '__main__':\n unittest.main()"
}
File created successfully at: /home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py
Now let me run the unit tests to verify everything works correctly:
{
"command": "python -m pytest test_budget_chat_server.py -v",
"description": "Run unit tests with pytest"
}/bin/bash: line 1: python: command not found
{
"command": "python3 -m pytest test_budget_chat_server.py -v",
"description": "Run unit tests with pytest using python3"
}/usr/bin/python3: No module named pytest
{
"command": "python3 -m unittest test_budget_chat_server.py -v",
"description": "Run unit tests with unittest module"
}test_chat_message_broadcasting (test_budget_chat_server.TestBudgetChatServer.test_chat_message_broadcasting) ... FAIL test_invalid_name_disconnection (test_budget_chat_server.TestBudgetChatServer.test...
test_chat_message_broadcasting (test_budget_chat_server.TestBudgetChatServer.test_chat_message_broadcasting) ... FAIL
test_invalid_name_disconnection (test_budget_chat_server.TestBudgetChatServer.test_invalid_name_disconnection) ... ok
test_long_message_truncation (test_budget_chat_server.TestBudgetChatServer.test_long_message_truncation) ... FAIL
test_message_not_sent_to_sender (test_budget_chat_server.TestBudgetChatServer.test_message_not_sent_to_sender) ... ok
test_multiple_clients_join_notification (test_budget_chat_server.TestBudgetChatServer.test_multiple_clients_join_notification) ... /usr/lib/python3.13/contextlib.py:444: ResourceWarning: unclosed <socket.socket fd=6, family=2, type=1, proto=0, laddr=('127.0.0.1', 53806), raddr=('127.0.0.1', 38847)>
def __init__(self, *exceptions):
ResourceWarning: Enable tracemalloc to get the object allocation traceback
/usr/lib/python3.13/contextlib.py:444: ResourceWarning: unclosed <socket.socket fd=7, family=2, type=1, proto=0, laddr=('127.0.0.1', 53808), raddr=('127.0.0.1', 38847)>
def __init__(self, *exceptions):
ResourceWarning: Enable tracemalloc to get the object allocation traceback
/usr/lib/python3.13/contextlib.py:444: ResourceWarning: unclosed <socket.socket fd=12, family=2, type=1, proto=0, laddr=('127.0.0.1', 33764), raddr=('127.0.0.1', 44677)>
def __init__(self, *exceptions):
ResourceWarning: Enable tracemalloc to get the object allocation traceback
/usr/lib/python3.13/contextlib.py:444: ResourceWarning: unclosed <socket.socket fd=14, family=2, type=1, proto=0, laddr=('127.0.0.1', 33776), raddr=('127.0.0.1', 44677)>
def __init__(self, *exceptions):
ResourceWarning: Enable tracemalloc to get the object allocation traceback
FAIL
test_name_validation (test_budget_chat_server.TestBudgetChatServer.test_name_validation) ... ok
test_single_client_connection (test_budget_chat_server.TestBudgetChatServer.test_single_client_connection) ... ok
test_three_clients_interaction (test_budget_chat_server.TestBudgetChatServer.test_three_clients_interaction) ... FAIL
test_user_leave_notification (test_budget_chat_server.TestBudgetChatServer.test_user_leave_notification) ... FAIL
======================================================================
FAIL: test_chat_message_broadcasting (test_budget_chat_server.TestBudgetChatServer.test_chat_message_broadcasting)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py", line 148, in test_chat_message_broadcasting
self.assertEqual(received_msg, "[alice] Hello everyone!")
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '' != '[alice] Hello everyone!'
+ [alice] Hello everyone!
======================================================================
FAIL: test_long_message_truncation (test_budget_chat_server.TestBudgetChatServer.test_long_message_truncation)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py", line 237, in test_long_message_truncation
self.assertEqual(received_msg, expected_msg)
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '' != '[alice] xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx[963 chars]xxxx'
Diff is 1012 characters long. Set self.maxDiff to None to see it.
======================================================================
FAIL: test_multiple_clients_join_notification (test_budget_chat_server.TestBudgetChatServer.test_multiple_clients_join_notification)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py", line 124, in test_multiple_clients_join_notification
self.assertEqual(room_msg, "* The room contains: alice")
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '' != '* The room contains: alice'
+ * The room contains: alice
======================================================================
FAIL: test_three_clients_interaction (test_budget_chat_server.TestBudgetChatServer.test_three_clients_interaction)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py", line 204, in test_three_clients_interaction
self.assertEqual(room_msg, f"* The room contains: {expected_users}")
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '' != '* The room contains: alice'
+ * The room contains: alice
======================================================================
FAIL: test_user_leave_notification (test_budget_chat_server.TestBudgetChatServer.test_user_leave_notification)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py", line 170, in test_user_leave_notification
self.assertEqual(leave_msg, "* alice has left the room")
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '' != '* alice has left the room'
+ * alice has left the room
----------------------------------------------------------------------
Ran 9 tests in 12.541s
FAILED (failures=5)
I need to fix the test timeout issues. Let me update the test to use longer timeouts:
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py",
"old_string": " def receive_message(self, client, timeout=1.0):\n ...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py",
"old_string": " def receive_message(self, client, timeout=1.0):\n client.settimeout(timeout)\n try:\n data = b''\n while True:\n chunk = client.recv(1)\n if not chunk:\n break\n if chunk == b'\\n':\n break\n data += chunk\n return data.decode('ascii')\n except socket.timeout:\n return \"\"\n finally:\n client.settimeout(None)",
"new_string": " def receive_message(self, client, timeout=2.0):\n client.settimeout(timeout)\n try:\n data = b''\n while True:\n chunk = client.recv(1)\n if not chunk:\n break\n if chunk == b'\\n':\n break\n data += chunk\n return data.decode('ascii')\n except socket.timeout:\n return \"\"\n finally:\n client.settimeout(None)"
}
The file /home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
45→
46→ def ...The file /home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
45→
46→ def send_message(self, client, message):
47→ client.send((message + '\n').encode('ascii'))
48→
49→ def receive_message(self, client, timeout=2.0):
50→ client.settimeout(timeout)
51→ try:
52→ data = b''
53→ while True:
54→ chunk = client.recv(1)
55→ if not chunk:
56→ break
57→ if chunk == b'\n':
58→ break
59→ data += chunk
60→ return data.decode('ascii')
61→ except socket.timeout:
62→ return ""
63→ finally:
64→ client.settimeout(None)
65→
66→ def test_name_validation(self):
67→ server = BudgetChatServer()
68→
Let me also add a small delay after sending join messages to allow for proper message processing:
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py",
"old_string": " self.send_message(client2, \"bob\")\n ...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py",
"old_string": " self.send_message(client2, \"bob\")\n \n room_msg = self.receive_message(client2)\n self.assertEqual(room_msg, \"* The room contains: alice\")",
"new_string": " self.send_message(client2, \"bob\")\n \n room_msg = self.receive_message(client2)\n self.assertEqual(room_msg, \"* The room contains: alice\")"
}
<tool_use_error>No changes to make: old_string and new_string are exactly the same.</tool_use_error>
Let me add a small delay after name setup:
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py",
"old_string": " self.receive_message(client2)\n self.send_m...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py",
"old_string": " self.receive_message(client2)\n self.send_message(client2, \"bob\")\n \n room_msg = self.receive_message(client2)",
"new_string": " self.receive_message(client2)\n self.send_message(client2, \"bob\")\n time.sleep(0.1)\n \n room_msg = self.receive_message(client2)"
}
The file /home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file: 116→ self.receive...
The file /home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file: 116→ self.receive_message(client1) 117→ 118→ client2 = self.create_client() 119→ 120→ self.receive_message(client2) 121→ self.send_message(client2, "bob") 122→ time.sleep(0.1) 123→ 124→ room_msg = self.receive_message(client2) 125→ self.assertEqual(room_msg, "* The room contains: alice") 126→ 127→ join_msg = self.receive_message(client1) 128→ self.assertEqual(join_msg, "* bob has entered the room")
Let me also fix similar issues in other tests:
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py",
"old_string": " self.receive_message(client2)\n self.send_m...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py",
"old_string": " self.receive_message(client2)\n self.send_message(client2, \"bob\")\n self.receive_message(client2)\n self.receive_message(client1)\n \n self.send_message(client1, \"Hello everyone!\")",
"new_string": " self.receive_message(client2)\n self.send_message(client2, \"bob\")\n self.receive_message(client2)\n self.receive_message(client1)\n time.sleep(0.1)\n \n self.send_message(client1, \"Hello everyone!\")"
}
The file /home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file: 137→ self.receive...
The file /home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file: 137→ self.receive_message(client1) 138→ self.send_message(client1, "alice") 139→ self.receive_message(client1) 140→ 141→ self.receive_message(client2) 142→ self.send_message(client2, "bob") 143→ self.receive_message(client2) 144→ self.receive_message(client1) 145→ time.sleep(0.1) 146→ 147→ self.send_message(client1, "Hello everyone!") 148→ 149→ received_msg = self.receive_message(client2) 150→ self.assertEqual(received_msg, "[alice] Hello everyone!") 151→
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py",
"old_string": " self.receive_message(client2)\n self.send_m...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py",
"old_string": " self.receive_message(client2)\n self.send_message(client2, \"bob\")\n self.receive_message(client2)\n self.receive_message(client1)\n \n client1.close()\n time.sleep(0.1)",
"new_string": " self.receive_message(client2)\n self.send_message(client2, \"bob\")\n self.receive_message(client2)\n self.receive_message(client1)\n time.sleep(0.1)\n \n client1.close()\n time.sleep(0.2)"
}
The file /home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file: 159→ self.receive...
The file /home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file: 159→ self.receive_message(client1) 160→ self.send_message(client1, "alice") 161→ self.receive_message(client1) 162→ 163→ self.receive_message(client2) 164→ self.send_message(client2, "bob") 165→ self.receive_message(client2) 166→ self.receive_message(client1) 167→ time.sleep(0.1) 168→ 169→ client1.close() 170→ time.sleep(0.2) 171→ 172→ leave_msg = self.receive_message(client2) 173→ self.assertEqual(leave_msg, "* alice has left the room") 174→
Let me also fix the three clients test:
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py",
"old_string": " self.receive_message(client)\n self...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py",
"old_string": " self.receive_message(client)\n self.send_message(client, name)\n \n room_msg = self.receive_message(client)",
"new_string": " self.receive_message(client)\n self.send_message(client, name)\n time.sleep(0.1)\n \n room_msg = self.receive_message(client)"
}
The file /home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file: 198→ for i, name ...
The file /home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
198→ for i, name in enumerate(names):
199→ client = self.create_client()
200→ clients.append(client)
201→
202→ self.receive_message(client)
203→ self.send_message(client, name)
204→ time.sleep(0.1)
205→
206→ room_msg = self.receive_message(client)
207→ expected_users = ", ".join(names[:i]) if i > 0 else ""
208→ self.assertEqual(room_msg, f"* The room contains: {expected_users}")
209→
210→ for j in range(i):
Let me also fix the long message test:
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py",
"old_string": " self.receive_message(client2)\n self.send_m...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py",
"old_string": " self.receive_message(client2)\n self.send_message(client2, \"bob\")\n self.receive_message(client2)\n self.receive_message(client1)\n \n long_message = \"x\" * 1500\n self.send_message(client1, long_message)",
"new_string": " self.receive_message(client2)\n self.send_message(client2, \"bob\")\n self.receive_message(client2)\n self.receive_message(client1)\n time.sleep(0.1)\n \n long_message = \"x\" * 1500\n self.send_message(client1, long_message)"
}
The file /home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file: 227→ self.receive...
The file /home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file: 227→ self.receive_message(client1) 228→ self.send_message(client1, "alice") 229→ self.receive_message(client1) 230→ 231→ self.receive_message(client2) 232→ self.send_message(client2, "bob") 233→ self.receive_message(client2) 234→ self.receive_message(client1) 235→ time.sleep(0.1) 236→ 237→ long_message = "x" * 1500 238→ self.send_message(client1, long_message) 239→ 240→ received_msg = self.receive_message(client2) 241→ expected_msg = "[alice] " + "x" * 1000 242→ self.assertEqual(received_msg, expected_msg)
Now let me run the tests again:
{
"command": "python3 -m unittest test_budget_chat_server.py -v",
"description": "Run unit tests again after fixes"
}test_chat_message_broadcasting (test_budget_chat_server.TestBudgetChatServer.test_chat_message_broadcasting) ... FAIL test_invalid_name_disconnection (test_budget_chat_server.TestBudgetChatServer.test...
test_chat_message_broadcasting (test_budget_chat_server.TestBudgetChatServer.test_chat_message_broadcasting) ... FAIL
test_invalid_name_disconnection (test_budget_chat_server.TestBudgetChatServer.test_invalid_name_disconnection) ... ok
test_long_message_truncation (test_budget_chat_server.TestBudgetChatServer.test_long_message_truncation) ... FAIL
test_message_not_sent_to_sender (test_budget_chat_server.TestBudgetChatServer.test_message_not_sent_to_sender) ... ok
test_multiple_clients_join_notification (test_budget_chat_server.TestBudgetChatServer.test_multiple_clients_join_notification) ... /usr/lib/python3.13/contextlib.py:444: ResourceWarning: unclosed <socket.socket fd=6, family=2, type=1, proto=0, laddr=('127.0.0.1', 58124), raddr=('127.0.0.1', 33681)>
def __init__(self, *exceptions):
ResourceWarning: Enable tracemalloc to get the object allocation traceback
/usr/lib/python3.13/contextlib.py:444: ResourceWarning: unclosed <socket.socket fd=7, family=2, type=1, proto=0, laddr=('127.0.0.1', 58130), raddr=('127.0.0.1', 33681)>
def __init__(self, *exceptions):
ResourceWarning: Enable tracemalloc to get the object allocation traceback
/usr/lib/python3.13/contextlib.py:444: ResourceWarning: unclosed <socket.socket fd=12, family=2, type=1, proto=0, laddr=('127.0.0.1', 54670), raddr=('127.0.0.1', 38841)>
def __init__(self, *exceptions):
ResourceWarning: Enable tracemalloc to get the object allocation traceback
/usr/lib/python3.13/contextlib.py:444: ResourceWarning: unclosed <socket.socket fd=14, family=2, type=1, proto=0, laddr=('127.0.0.1', 54672), raddr=('127.0.0.1', 38841)>
def __init__(self, *exceptions):
ResourceWarning: Enable tracemalloc to get the object allocation traceback
FAIL
test_name_validation (test_budget_chat_server.TestBudgetChatServer.test_name_validation) ... ok
test_single_client_connection (test_budget_chat_server.TestBudgetChatServer.test_single_client_connection) ... ok
test_three_clients_interaction (test_budget_chat_server.TestBudgetChatServer.test_three_clients_interaction) ... FAIL
test_user_leave_notification (test_budget_chat_server.TestBudgetChatServer.test_user_leave_notification) ... FAIL
======================================================================
FAIL: test_chat_message_broadcasting (test_budget_chat_server.TestBudgetChatServer.test_chat_message_broadcasting)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py", line 150, in test_chat_message_broadcasting
self.assertEqual(received_msg, "[alice] Hello everyone!")
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '' != '[alice] Hello everyone!'
+ [alice] Hello everyone!
======================================================================
FAIL: test_long_message_truncation (test_budget_chat_server.TestBudgetChatServer.test_long_message_truncation)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py", line 242, in test_long_message_truncation
self.assertEqual(received_msg, expected_msg)
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '' != '[alice] xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx[963 chars]xxxx'
Diff is 1012 characters long. Set self.maxDiff to None to see it.
======================================================================
FAIL: test_multiple_clients_join_notification (test_budget_chat_server.TestBudgetChatServer.test_multiple_clients_join_notification)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py", line 125, in test_multiple_clients_join_notification
self.assertEqual(room_msg, "* The room contains: alice")
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '' != '* The room contains: alice'
+ * The room contains: alice
======================================================================
FAIL: test_three_clients_interaction (test_budget_chat_server.TestBudgetChatServer.test_three_clients_interaction)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py", line 208, in test_three_clients_interaction
self.assertEqual(room_msg, f"* The room contains: {expected_users}")
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '' != '* The room contains: alice'
+ * The room contains: alice
======================================================================
FAIL: test_user_leave_notification (test_budget_chat_server.TestBudgetChatServer.test_user_leave_notification)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/smite/dev/protohackers/3-budget-chat/test_budget_chat_server.py", line 173, in test_user_leave_notification
self.assertEqual(leave_msg, "* alice has left the room")
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '' != '* alice has left the room'
+ * alice has left the room
----------------------------------------------------------------------
Ran 9 tests in 24.248s
FAILED (failures=5)
I need to debug what's happening. Let me create a simpler test to check if messages are being received at all:
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/simple_test.py",
"content": "#!/usr/bin/env python3\nimport socket\nimport threading\nimport time\nfro...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/simple_test.py",
"content": "#!/usr/bin/env python3\nimport socket\nimport threading\nimport time\nfrom budget_chat_server import BudgetChatServer\n\ndef start_server():\n server = BudgetChatServer(host='localhost', port=0)\n server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\n server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)\n server_socket.bind((server.host, server.port))\n server_socket.listen(10)\n \n port = server_socket.getsockname()[1]\n print(f\"Server listening on port {port}\")\n \n def run_server():\n try:\n while True:\n client_socket, address = server_socket.accept()\n client_thread = threading.Thread(\n target=server.handle_client,\n args=(client_socket,)\n )\n client_thread.daemon = True\n client_thread.start()\n except OSError:\n pass\n \n server_thread = threading.Thread(target=run_server)\n server_thread.daemon = True\n server_thread.start()\n \n return port, server_socket\n\ndef create_client(port):\n client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\n client.connect(('localhost', port))\n return client\n\ndef send_message(client, message):\n client.send((message + '\\n').encode('ascii'))\n\ndef receive_message(client, timeout=2.0):\n client.settimeout(timeout)\n try:\n data = b''\n while True:\n chunk = client.recv(1)\n if not chunk:\n break\n if chunk == b'\\n':\n break\n data += chunk\n return data.decode('ascii')\n except socket.timeout:\n return \"\"\n finally:\n client.settimeout(None)\n\ndef main():\n port, server_socket = start_server()\n time.sleep(0.1)\n \n print(\"Testing basic connection...\")\n client1 = create_client(port)\n \n msg = receive_message(client1)\n print(f\"Received welcome: '{msg}'\")\n \n send_message(client1, \"alice\")\n \n msg = receive_message(client1)\n print(f\"Received room list: '{msg}'\")\n \n print(\"\\nTesting second client...\")\n client2 = create_client(port)\n \n msg = receive_message(client2)\n print(f\"Client2 received welcome: '{msg}'\")\n \n send_message(client2, \"bob\")\n \n msg = receive_message(client2)\n print(f\"Client2 received room list: '{msg}'\")\n \n msg = receive_message(client1)\n print(f\"Client1 received join notification: '{msg}'\")\n \n print(\"\\nTesting chat message...\")\n send_message(client1, \"Hello!\")\n \n msg = receive_message(client2)\n print(f\"Client2 received message: '{msg}'\")\n \n client1.close()\n client2.close()\n server_socket.close()\n\nif __name__ == \"__main__\":\n main()"
}
File created successfully at: /home/smite/dev/protohackers/3-budget-chat/simple_test.py
{
"command": "python3 simple_test.py",
"description": "Run simple test to debug message flow"
}Server listening on port 35891 Testing basic connection... Received welcome: 'Welcome to budgetchat! What shall I call you?' Received room list: '* The room contains: ' Testing se...
Server listening on port 35891 Testing basic connection... Received welcome: 'Welcome to budgetchat! What shall I call you?' Received room list: '* The room contains: ' Testing second client... Client2 received welcome: 'Welcome to budgetchat! What shall I call you?' Client2 received room list: '' Client1 received join notification: '' Testing chat message... Client2 received message: ''
I see the issue! There's a race condition in the server code. The messages are being sent before the clients are properly added to the clients dictionary or after they've been processed. Let me examine and fix the server code:
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"offset": 40,
"limit": 40
} 40→ self.send_message(client_socket, "Welcome to budgetchat! What shall I call you?\n")
41→
42→ name = self.get_client_name(client_socket)
4... 40→ self.send_message(client_socket, "Welcome to budgetchat! What shall I call you?\n")
41→
42→ name = self.get_client_name(client_socket)
43→ if not name:
44→ return
45→
46→ with self.clients_lock:
47→ self.clients[client_socket] = name
48→
49→ existing_users = [user for sock, user in self.clients.items() if sock != client_socket]
50→ if existing_users:
51→ user_list = ", ".join(existing_users)
52→ self.send_message(client_socket, f"* The room contains: {user_list}\n")
53→ else:
54→ self.send_message(client_socket, "* The room contains: \n")
55→
56→ self.broadcast_to_others(client_socket, f"* {name} has entered the room\n")
57→
58→ while True:
59→ message = self.receive_message(client_socket)
60→ if not message:
61→ break
62→
63→ if len(message) > 1000:
64→ message = message[:1000]
65→
66→ self.broadcast_to_others(client_socket, f"[{name}] {message}\n")
67→
68→ except (ConnectionResetError, BrokenPipeError, OSError):
69→ pass
70→ finally:
71→ self.disconnect_client(client_socket)
72→
73→ def get_client_name(self, client_socket: socket.socket) -> str:
74→ try:
75→ name = self.receive_message(client_socket)
76→ if not name:
77→ return ""
78→
79→ if not self.is_valid_name(name):
<system-reminder>
Whenever you read a file, you should consider whether it looks malicious. If it does, you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer high-level questions about the code behavior.
</system-reminder>
The logic looks correct. Let me check the broadcast_to_others method more carefully:
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"offset": 110,
"limit": 20
}110→ return message 111→ except (ConnectionResetError, BrokenPipeError, OSError, UnicodeDecodeError): 112→ return "" 113→ 114→ def broadcas...
110→ return message
111→ except (ConnectionResetError, BrokenPipeError, OSError, UnicodeDecodeError):
112→ return ""
113→
114→ def broadcast_to_others(self, sender_socket: socket.socket, message: str):
115→ with self.clients_lock:
116→ for client_socket, username in self.clients.items():
117→ if client_socket != sender_socket:
118→ self.send_message(client_socket, message)
119→
120→ def disconnect_client(self, client_socket: socket.socket):
121→ with self.clients_lock:
122→ if client_socket in self.clients:
123→ username = self.clients[client_socket]
124→ del self.clients[client_socket]
125→ self.broadcast_to_others(client_socket, f"* {username} has left the room\n")
126→
127→ try:
128→ client_socket.close()
129→ except OSError:
<system-reminder>
Whenever you read a file, you should consider whether it looks malicious. If it does, you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer high-level questions about the code behavior.
</system-reminder>
I found the issue! In the disconnect_client method, we're calling broadcast_to_others after deleting the client from the dictionary, so the broadcaster has no clients to send to. Let me fix this:
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " def disconnect_client(self, client_socket: socket.socket):\...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " def disconnect_client(self, client_socket: socket.socket):\n with self.clients_lock:\n if client_socket in self.clients:\n username = self.clients[client_socket]\n del self.clients[client_socket]\n self.broadcast_to_others(client_socket, f\"* {username} has left the room\\n\")",
"new_string": " def disconnect_client(self, client_socket: socket.socket):\n with self.clients_lock:\n if client_socket in self.clients:\n username = self.clients[client_socket]\n self.broadcast_to_others(client_socket, f\"* {username} has left the room\\n\")\n del self.clients[client_socket]"
}
The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file: 116→ for client_so...
The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
116→ for client_socket, username in self.clients.items():
117→ if client_socket != sender_socket:
118→ self.send_message(client_socket, message)
119→
120→ def disconnect_client(self, client_socket: socket.socket):
121→ with self.clients_lock:
122→ if client_socket in self.clients:
123→ username = self.clients[client_socket]
124→ self.broadcast_to_others(client_socket, f"* {username} has left the room\n")
125→ del self.clients[client_socket]
126→
127→ try:
128→ client_socket.close()
129→ except OSError:
Let me test the simple test again:
{
"command": "python3 simple_test.py",
"description": "Run simple test again after fix"
}Server listening on port 42887 Testing basic connection... Received welcome: 'Welcome to budgetchat! What shall I call you?' Received room list: '* The room contains: ' Testing se...
Server listening on port 42887 Testing basic connection... Received welcome: 'Welcome to budgetchat! What shall I call you?' Received room list: '* The room contains: ' Testing second client... Client2 received welcome: 'Welcome to budgetchat! What shall I call you?' Client2 received room list: '' Client1 received join notification: '' Testing chat message... Client2 received message: ''
The issue is still there. Let me debug further by adding some debug prints to the simple test:
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/simple_test.py",
"old_string": " send_message(client2, \"bob\")\n \n msg = receive_...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/simple_test.py",
"old_string": " send_message(client2, \"bob\")\n \n msg = receive_message(client2)\n print(f\"Client2 received room list: '{msg}'\")",
"new_string": " send_message(client2, \"bob\")\n time.sleep(0.2)\n \n msg = receive_message(client2)\n print(f\"Client2 received room list: '{msg}'\")"
}
The file /home/smite/dev/protohackers/3-budget-chat/simple_test.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
78→
79→ msg = receive_me...The file /home/smite/dev/protohackers/3-budget-chat/simple_test.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
78→
79→ msg = receive_message(client2)
80→ print(f"Client2 received welcome: '{msg}'")
81→
82→ send_message(client2, "bob")
83→ time.sleep(0.2)
84→
85→ msg = receive_message(client2)
86→ print(f"Client2 received room list: '{msg}'")
87→
88→ msg = receive_message(client1)
89→ print(f"Client1 received join notification: '{msg}'")
90→
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/simple_test.py",
"old_string": " msg = receive_message(client1)\n print(f\"Client1 received...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/simple_test.py",
"old_string": " msg = receive_message(client1)\n print(f\"Client1 received join notification: '{msg}'\")",
"new_string": " msg = receive_message(client1, timeout=3.0)\n print(f\"Client1 received join notification: '{msg}'\")"
}
The file /home/smite/dev/protohackers/3-budget-chat/simple_test.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
84→
85→ msg = receive_me...The file /home/smite/dev/protohackers/3-budget-chat/simple_test.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
84→
85→ msg = receive_message(client2)
86→ print(f"Client2 received room list: '{msg}'")
87→
88→ msg = receive_message(client1, timeout=3.0)
89→ print(f"Client1 received join notification: '{msg}'")
90→
91→ print("\nTesting chat message...")
92→ send_message(client1, "Hello!")
93→
{
"command": "python3 simple_test.py",
"description": "Run simple test with longer timeout"
}Server listening on port 43729 Testing basic connection... Received welcome: 'Welcome to budgetchat! What shall I call you?' Received room list: '* The room contains: ' Testing se...
Server listening on port 43729 Testing basic connection... Received welcome: 'Welcome to budgetchat! What shall I call you?' Received room list: '* The room contains: ' Testing second client... Client2 received welcome: 'Welcome to budgetchat! What shall I call you?' Client2 received room list: '' Client1 received join notification: '' Testing chat message... Client2 received message: ''
Let me add some debug prints to the server to see what's happening:
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " with self.clients_lock:\n self.clien...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " with self.clients_lock:\n self.clients[client_socket] = name\n \n existing_users = [user for sock, user in self.clients.items() if sock != client_socket]\n if existing_users:\n user_list = \", \".join(existing_users)\n self.send_message(client_socket, f\"* The room contains: {user_list}\\n\")\n else:\n self.send_message(client_socket, \"* The room contains: \\n\")\n \n self.broadcast_to_others(client_socket, f\"* {name} has entered the room\\n\")",
"new_string": " with self.clients_lock:\n self.clients[client_socket] = name\n print(f\"DEBUG: Added {name} to clients. Total clients: {len(self.clients)}\")\n \n existing_users = [user for sock, user in self.clients.items() if sock != client_socket]\n if existing_users:\n user_list = \", \".join(existing_users)\n self.send_message(client_socket, f\"* The room contains: {user_list}\\n\")\n print(f\"DEBUG: Sent room list to {name}: {user_list}\")\n else:\n self.send_message(client_socket, \"* The room contains: \\n\")\n print(f\"DEBUG: Sent empty room list to {name}\")\n \n print(f\"DEBUG: Broadcasting join message for {name} to {len(existing_users)} clients\")\n self.broadcast_to_others(client_socket, f\"* {name} has entered the room\\n\")"
}
The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
42→ name = self.g...The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
42→ name = self.get_client_name(client_socket)
43→ if not name:
44→ return
45→
46→ with self.clients_lock:
47→ self.clients[client_socket] = name
48→ print(f"DEBUG: Added {name} to clients. Total clients: {len(self.clients)}")
49→
50→ existing_users = [user for sock, user in self.clients.items() if sock != client_socket]
51→ if existing_users:
52→ user_list = ", ".join(existing_users)
53→ self.send_message(client_socket, f"* The room contains: {user_list}\n")
54→ print(f"DEBUG: Sent room list to {name}: {user_list}")
55→ else:
56→ self.send_message(client_socket, "* The room contains: \n")
57→ print(f"DEBUG: Sent empty room list to {name}")
58→
59→ print(f"DEBUG: Broadcasting join message for {name} to {len(existing_users)} clients")
60→ self.broadcast_to_others(client_socket, f"* {name} has entered the room\n")
61→
62→ while True:
63→ message = self.receive_message(client_socket)
64→ if not message:
{
"command": "python3 simple_test.py",
"description": "Run simple test with debug prints"
}Server listening on port 37377 Testing basic connection... Received welcome: 'Welcome to budgetchat! What shall I call you?' DEBUG: Added alice to clients. Total clients: 1 DEBUG: Sent empty...
Server listening on port 37377 Testing basic connection... Received welcome: 'Welcome to budgetchat! What shall I call you?' DEBUG: Added alice to clients. Total clients: 1 DEBUG: Sent empty room list to alice DEBUG: Broadcasting join message for alice to 0 clients Received room list: '* The room contains: ' Testing second client... Client2 received welcome: 'Welcome to budgetchat! What shall I call you?' Client2 received room list: '' Client1 received join notification: '' Testing chat message... Client2 received message: ''
I see! The second client isn't getting past the name validation. Let me check if there's an issue with the get_client_name method. Let me add debug to that too:
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " def get_client_name(self, client_socket: socket.socket) -&g...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " def get_client_name(self, client_socket: socket.socket) -> str:\n try:\n name = self.receive_message(client_socket)\n if not name:\n return \"\"\n \n if not self.is_valid_name(name):\n self.send_message(client_socket, \"Invalid name. Name must be 1-16 alphanumeric characters.\\n\")\n return \"\"\n \n return name\n except (ConnectionResetError, BrokenPipeError, OSError):\n return \"\"",
"new_string": " def get_client_name(self, client_socket: socket.socket) -> str:\n try:\n name = self.receive_message(client_socket)\n print(f\"DEBUG: Received name: '{name}'\")\n if not name:\n print(\"DEBUG: Empty name received\")\n return \"\"\n \n if not self.is_valid_name(name):\n print(f\"DEBUG: Invalid name: '{name}'\")\n self.send_message(client_socket, \"Invalid name. Name must be 1-16 alphanumeric characters.\\n\")\n return \"\"\n \n print(f\"DEBUG: Valid name: '{name}'\")\n return name\n except (ConnectionResetError, BrokenPipeError, OSError):\n print(\"DEBUG: Exception in get_client_name\")\n return \"\""
}
The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
73→ pass
74→ ...The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
73→ pass
74→ finally:
75→ self.disconnect_client(client_socket)
76→
77→ def get_client_name(self, client_socket: socket.socket) -> str:
78→ try:
79→ name = self.receive_message(client_socket)
80→ print(f"DEBUG: Received name: '{name}'")
81→ if not name:
82→ print("DEBUG: Empty name received")
83→ return ""
84→
85→ if not self.is_valid_name(name):
86→ print(f"DEBUG: Invalid name: '{name}'")
87→ self.send_message(client_socket, "Invalid name. Name must be 1-16 alphanumeric characters.\n")
88→ return ""
89→
90→ print(f"DEBUG: Valid name: '{name}'")
91→ return name
92→ except (ConnectionResetError, BrokenPipeError, OSError):
93→ print("DEBUG: Exception in get_client_name")
94→ return ""
95→
96→ def is_valid_name(self, name: str) -> bool:
97→ if not name or len(name) > 16:
98→ return False
{
"command": "python3 simple_test.py",
"description": "Run simple test with name debugging"
}Server listening on port 38703 Testing basic connection... Received welcome: 'Welcome to budgetchat! What shall I call you?' DEBUG: Received name: 'alice' DEBUG: Valid name: '...
Server listening on port 38703 Testing basic connection... Received welcome: 'Welcome to budgetchat! What shall I call you?' DEBUG: Received name: 'alice' DEBUG: Valid name: 'alice' DEBUG: Added alice to clients. Total clients: 1 DEBUG: Sent empty room list to alice DEBUG: Broadcasting join message for alice to 0 clients Received room list: '* The room contains: ' Testing second client... Client2 received welcome: 'Welcome to budgetchat! What shall I call you?' DEBUG: Received name: 'bob' DEBUG: Valid name: 'bob' Client2 received room list: '' Client1 received join notification: '' Testing chat message... Client2 received message: ''
The name is valid but the client2 isn't getting the room list message. That means the send_message call after the name validation is not working. Let me check if there's an issue with socket handling. Let me also add debug to the message sending:
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " def send_message(self, client_socket: socket.socket, messag...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " def send_message(self, client_socket: socket.socket, message: str):\n try:\n client_socket.send(message.encode('ascii'))\n except (ConnectionResetError, BrokenPipeError, OSError):\n pass",
"new_string": " def send_message(self, client_socket: socket.socket, message: str):\n try:\n client_socket.send(message.encode('ascii'))\n print(f\"DEBUG: Sent message: '{message.strip()}'\")\n except (ConnectionResetError, BrokenPipeError, OSError) as e:\n print(f\"DEBUG: Error sending message: {e}\")\n pass"
}
The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
97→ if not name or le...The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
97→ if not name or len(name) > 16:
98→ return False
99→ return re.match(r'^[a-zA-Z0-9]+$', name) is not None
100→
101→ def send_message(self, client_socket: socket.socket, message: str):
102→ try:
103→ client_socket.send(message.encode('ascii'))
104→ print(f"DEBUG: Sent message: '{message.strip()}'")
105→ except (ConnectionResetError, BrokenPipeError, OSError) as e:
106→ print(f"DEBUG: Error sending message: {e}")
107→ pass
108→
109→ def receive_message(self, client_socket: socket.socket) -> str:
110→ try:
111→ data = b''
{
"command": "python3 simple_test.py",
"description": "Run simple test with message send debugging"
}Server listening on port 46577 Testing basic connection... DEBUG: Sent message: 'Welcome to budgetchat! What shall I call you?' Received welcome: 'Welcome to budgetchat! What shall I ca...
Server listening on port 46577 Testing basic connection... DEBUG: Sent message: 'Welcome to budgetchat! What shall I call you?' Received welcome: 'Welcome to budgetchat! What shall I call you?' DEBUG: Received name: 'alice' DEBUG: Valid name: 'alice' DEBUG: Added alice to clients. Total clients: 1 DEBUG: Sent message: '* The room contains:' DEBUG: Sent empty room list to alice DEBUG: Broadcasting join message for alice to 0 clients Received room list: '* The room contains: ' Testing second client... DEBUG: Sent message: 'Welcome to budgetchat! What shall I call you?' Client2 received welcome: 'Welcome to budgetchat! What shall I call you?' DEBUG: Received name: 'bob' DEBUG: Valid name: 'bob' Client2 received room list: '' Client1 received join notification: '' Testing chat message... Client2 received message: ''
I notice the issue! The debug shows "DEBUG: Valid name: 'bob'" but no subsequent messages about adding bob to clients or sending messages. This suggests the connection is being closed or there's an exception after the name validation. Let me check if the issue is that the client connection is getting closed.
Let me add more debug around where the clients are added:
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " name = self.get_client_name(client_socket)\n ...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " name = self.get_client_name(client_socket)\n if not name:\n return",
"new_string": " name = self.get_client_name(client_socket)\n if not name:\n print(\"DEBUG: get_client_name returned empty, returning\")\n return\n \n print(f\"DEBUG: About to add {name} to clients\")"
}
The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
38→ def handle_client(sel...The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
38→ def handle_client(self, client_socket: socket.socket):
39→ try:
40→ self.send_message(client_socket, "Welcome to budgetchat! What shall I call you?\n")
41→
42→ name = self.get_client_name(client_socket)
43→ if not name:
44→ print("DEBUG: get_client_name returned empty, returning")
45→ return
46→
47→ print(f"DEBUG: About to add {name} to clients")
48→
49→ with self.clients_lock:
50→ self.clients[client_socket] = name
51→ print(f"DEBUG: Added {name} to clients. Total clients: {len(self.clients)}")
{
"command": "python3 simple_test.py",
"description": "Run simple test with client addition debugging"
}Server listening on port 39723 Testing basic connection... DEBUG: Sent message: 'Welcome to budgetchat! What shall I call you?' Received welcome: 'Welcome to budgetchat! What shall I ca...
Server listening on port 39723 Testing basic connection... DEBUG: Sent message: 'Welcome to budgetchat! What shall I call you?' Received welcome: 'Welcome to budgetchat! What shall I call you?' DEBUG: Received name: 'alice' DEBUG: Valid name: 'alice' DEBUG: About to add alice to clients DEBUG: Added alice to clients. Total clients: 1 DEBUG: Sent message: '* The room contains:' DEBUG: Sent empty room list to alice DEBUG: Broadcasting join message for alice to 0 clients Received room list: '* The room contains: ' Testing second client... DEBUG: Sent message: 'Welcome to budgetchat! What shall I call you?' Client2 received welcome: 'Welcome to budgetchat! What shall I call you?' DEBUG: Received name: 'bob' DEBUG: Valid name: 'bob' DEBUG: About to add bob to clients Client2 received room list: '' Client1 received join notification: '' Testing chat message... Client2 received message: ''
Now I see the issue! The second client gets to "About to add bob to clients" but never reaches the "Added bob to clients" message. This suggests there's a deadlock or exception when trying to acquire the clients_lock.
The issue might be that the first client is still holding the lock or there's a deadlock condition. But I don't see why that would happen. Let me remove the debug messages and try a different approach - I suspect there might be an issue with how the clients dictionary is being handled when there are multiple concurrent connections.
Let me clean up the debug messages first and try a more targeted fix:
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " def send_message(self, client_socket: socket.socket, messag...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " def send_message(self, client_socket: socket.socket, message: str):\n try:\n client_socket.send(message.encode('ascii'))\n print(f\"DEBUG: Sent message: '{message.strip()}'\")\n except (ConnectionResetError, BrokenPipeError, OSError) as e:\n print(f\"DEBUG: Error sending message: {e}\")\n pass",
"new_string": " def send_message(self, client_socket: socket.socket, message: str):\n try:\n client_socket.send(message.encode('ascii'))\n except (ConnectionResetError, BrokenPipeError, OSError):\n pass"
}
The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file: 100→ if not name or le...
The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
100→ if not name or len(name) > 16:
101→ return False
102→ return re.match(r'^[a-zA-Z0-9]+$', name) is not None
103→
104→ def send_message(self, client_socket: socket.socket, message: str):
105→ try:
106→ client_socket.send(message.encode('ascii'))
107→ except (ConnectionResetError, BrokenPipeError, OSError):
108→ pass
109→
110→ def receive_message(self, client_socket: socket.socket) -> str:
111→ try:
112→ data = b''
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " def get_client_name(self, client_socket: socket.socket) -&g...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " def get_client_name(self, client_socket: socket.socket) -> str:\n try:\n name = self.receive_message(client_socket)\n print(f\"DEBUG: Received name: '{name}'\")\n if not name:\n print(\"DEBUG: Empty name received\")\n return \"\"\n \n if not self.is_valid_name(name):\n print(f\"DEBUG: Invalid name: '{name}'\")\n self.send_message(client_socket, \"Invalid name. Name must be 1-16 alphanumeric characters.\\n\")\n return \"\"\n \n print(f\"DEBUG: Valid name: '{name}'\")\n return name\n except (ConnectionResetError, BrokenPipeError, OSError):\n print(\"DEBUG: Exception in get_client_name\")\n return \"\"",
"new_string": " def get_client_name(self, client_socket: socket.socket) -> str:\n try:\n name = self.receive_message(client_socket)\n if not name:\n return \"\"\n \n if not self.is_valid_name(name):\n self.send_message(client_socket, \"Invalid name. Name must be 1-16 alphanumeric characters.\\n\")\n return \"\"\n \n return name\n except (ConnectionResetError, BrokenPipeError, OSError):\n return \"\""
}
The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
76→ pass
77→ ...The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
76→ pass
77→ finally:
78→ self.disconnect_client(client_socket)
79→
80→ def get_client_name(self, client_socket: socket.socket) -> str:
81→ try:
82→ name = self.receive_message(client_socket)
83→ if not name:
84→ return ""
85→
86→ if not self.is_valid_name(name):
87→ self.send_message(client_socket, "Invalid name. Name must be 1-16 alphanumeric characters.\n")
88→ return ""
89→
90→ return name
91→ except (ConnectionResetError, BrokenPipeError, OSError):
92→ return ""
93→
94→ def is_valid_name(self, name: str) -> bool:
95→ if not name or len(name) > 16:
96→ return False
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " name = self.get_client_name(client_socket)\n ...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " name = self.get_client_name(client_socket)\n if not name:\n print(\"DEBUG: get_client_name returned empty, returning\")\n return\n \n print(f\"DEBUG: About to add {name} to clients\")\n \n with self.clients_lock:\n self.clients[client_socket] = name\n print(f\"DEBUG: Added {name} to clients. Total clients: {len(self.clients)}\")\n \n existing_users = [user for sock, user in self.clients.items() if sock != client_socket]\n if existing_users:\n user_list = \", \".join(existing_users)\n self.send_message(client_socket, f\"* The room contains: {user_list}\\n\")\n print(f\"DEBUG: Sent room list to {name}: {user_list}\")\n else:\n self.send_message(client_socket, \"* The room contains: \\n\")\n print(f\"DEBUG: Sent empty room list to {name}\")\n \n print(f\"DEBUG: Broadcasting join message for {name} to {len(existing_users)} clients\")\n self.broadcast_to_others(client_socket, f\"* {name} has entered the room\\n\")",
"new_string": " name = self.get_client_name(client_socket)\n if not name:\n return\n \n with self.clients_lock:\n self.clients[client_socket] = name\n \n existing_users = [user for sock, user in self.clients.items() if sock != client_socket]\n if existing_users:\n user_list = \", \".join(existing_users)\n self.send_message(client_socket, f\"* The room contains: {user_list}\\n\")\n else:\n self.send_message(client_socket, \"* The room contains: \\n\")\n \n self.broadcast_to_others(client_socket, f\"* {name} has entered the room\\n\")"
}
The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
38→ def handle_client(sel...The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
38→ def handle_client(self, client_socket: socket.socket):
39→ try:
40→ self.send_message(client_socket, "Welcome to budgetchat! What shall I call you?\n")
41→
42→ name = self.get_client_name(client_socket)
43→ if not name:
44→ return
45→
46→ with self.clients_lock:
47→ self.clients[client_socket] = name
48→
49→ existing_users = [user for sock, user in self.clients.items() if sock != client_socket]
50→ if existing_users:
51→ user_list = ", ".join(existing_users)
52→ self.send_message(client_socket, f"* The room contains: {user_list}\n")
53→ else:
54→ self.send_message(client_socket, "* The room contains: \n")
55→
56→ self.broadcast_to_others(client_socket, f"* {name} has entered the room\n")
57→
58→ while True:
59→ message = self.receive_message(client_socket)
60→ if not message:
Now let me think about this differently. The issue might be that when I hold the clients_lock in the main thread while inside the broadcast_to_others call, and the broadcast_to_others tries to acquire the same lock, but it already has it. But looking at the code, broadcast_to_others does acquire the lock again, but that should be fine with Python's reentrant locks. Let me make sure I'm using a reentrant lock:
{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " self.clients_lock = threading.Lock()",
"new...{
"file_path": "/home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py",
"old_string": " self.clients_lock = threading.Lock()",
"new_string": " self.clients_lock = threading.RLock()"
}
The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
9→ def __init__(self, ho...The file /home/smite/dev/protohackers/3-budget-chat/budget_chat_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
9→ def __init__(self, host='localhost', port=8080):
10→ self.host = host
11→ self.port = port
12→ self.clients: Dict[socket.socket, str] = {}
13→ self.clients_lock = threading.RLock()
14→
15→ def start(self):
16→ server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
17→ server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
Now let me test this fix:
{
"command": "python3 simple_test.py",
"description": "Run simple test after RLock fix"
}Server listening on port 38057 Testing basic connection... Received welcome: 'Welcome to budgetchat! What shall I call you?' Received room list: '* The room contains: ' Testing se...
Server listening on port 38057 Testing basic connection... Received welcome: 'Welcome to budgetchat! What shall I call you?' Received room list: '* The room contains: ' Testing second client... Client2 received welcome: 'Welcome to budgetchat! What shall I call you?' Client2 received room list: '* The room contains: alice' Client1 received join notification: '* bob has entered the room' Testing chat message... Client2 received message: '[alice] Hello!'
Excellent! The fix worked. The issue was that I was using a regular Lock() instead of a reentrant lock (RLock()). When broadcast_to_others was called from within the lock context, it tried to acquire the lock again, causing a deadlock.
Now let me run the unit tests:
{
"command": "python3 -m unittest test_budget_chat_server.py -v",
"description": "Run unit tests after fixing server"
}test_chat_message_broadcasting (test_budget_chat_server.TestBudgetChatServer.test_chat_message_broadcasting) ... ok test_invalid_name_disconnection (test_budget_chat_server.TestBudgetChatServer.test_i...
test_chat_message_broadcasting (test_budget_chat_server.TestBudgetChatServer.test_chat_message_broadcasting) ... ok test_invalid_name_disconnection (test_budget_chat_server.TestBudgetChatServer.test_invalid_name_disconnection) ... ok test_long_message_truncation (test_budget_chat_server.TestBudgetChatServer.test_long_message_truncation) ... ok test_message_not_sent_to_sender (test_budget_chat_server.TestBudgetChatServer.test_message_not_sent_to_sender) ... ok test_multiple_clients_join_notification (test_budget_chat_server.TestBudgetChatServer.test_multiple_clients_join_notification) ... ok test_name_validation (test_budget_chat_server.TestBudgetChatServer.test_name_validation) ... ok test_single_client_connection (test_budget_chat_server.TestBudgetChatServer.test_single_client_connection) ... ok test_three_clients_interaction (test_budget_chat_server.TestBudgetChatServer.test_three_clients_interaction) ... ok test_user_leave_notification (test_budget_chat_server.TestBudgetChatServer.test_user_leave_notification) ... ok ---------------------------------------------------------------------- Ran 9 tests in 2.449s OK
Perfect! All tests are passing now. Let me clean up by removing the debug files and updating the todo list:
{
"command": "rm simple_test.py",
"description": "Remove debug test file"
}Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable
Now let me run a final test to make sure the server can handle the required minimum of 10 simultaneous clients:
{
"command": "python3 -c \"\nimport socket\nimport threading\nimport time\nfrom budget_chat_server import BudgetChatServer\n\ndef test_concurrent_clients():\n server = BudgetC...{
"command": "python3 -c \"\nimport socket\nimport threading\nimport time\nfrom budget_chat_server import BudgetChatServer\n\ndef test_concurrent_clients():\n server = BudgetChatServer(host='localhost', port=0)\n server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\n server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)\n server_socket.bind((server.host, server.port))\n server_socket.listen(10)\n \n port = server_socket.getsockname()[1]\n print(f'Server listening on port {port}')\n \n def run_server():\n try:\n while True:\n client_socket, address = server_socket.accept()\n client_thread = threading.Thread(target=server.handle_client, args=(client_socket,))\n client_thread.daemon = True\n client_thread.start()\n except OSError:\n pass\n \n server_thread = threading.Thread(target=run_server)\n server_thread.daemon = True\n server_thread.start()\n time.sleep(0.1)\n \n clients = []\n for i in range(12): # Test with 12 clients\n client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\n client.connect(('localhost', port))\n clients.append(client)\n \n # Receive welcome\n client.settimeout(2.0)\n data = b''\n while True:\n chunk = client.recv(1)\n if chunk == b'\\n':\n break\n data += chunk\n welcome = data.decode('ascii')\n \n # Send name\n client.send(f'user{i}\\n'.encode('ascii'))\n \n # Receive room list\n data = b''\n while True:\n chunk = client.recv(1)\n if chunk == b'\\n':\n break\n data += chunk\n room_list = data.decode('ascii')\n \n print(f'Client {i}: Connected successfully. Room has {len(room_list.split(\\\", \\\")) if \\\", \\\" in room_list else (1 if room_list.count(\\\":\\\") > 0 and \\\"user\\\" in room_list else 0)} other users')\n \n print(f'Successfully connected {len(clients)} clients')\n for client in clients:\n client.close()\n server_socket.close()\n\ntest_concurrent_clients()\n\"",
"description": "Test server with 12 concurrent clients"
}
Server listening on port 38779 Client 0: Connected successfully. Room has 0 other users Client 1: Connected successfully. Room has 1 other users Client 2: Connected successfully. Room has 2 other user...
Server listening on port 38779 Client 0: Connected successfully. Room has 0 other users Client 1: Connected successfully. Room has 1 other users Client 2: Connected successfully. Room has 2 other users Client 3: Connected successfully. Room has 3 other users Client 4: Connected successfully. Room has 4 other users Client 5: Connected successfully. Room has 5 other users Client 6: Connected successfully. Room has 6 other users Client 7: Connected successfully. Room has 7 other users Client 8: Connected successfully. Room has 8 other users Client 9: Connected successfully. Room has 9 other users Client 10: Connected successfully. Room has 10 other users Client 11: Connected successfully. Room has 11 other users Successfully connected 12 clients
Perfect! The server successfully handles more than the required 10 simultaneous clients.
I have successfully implemented a Python server conforming to the Budget Chat specifications with comprehensive unit tests. Here's what was delivered:
Files created:
budget_chat_server.py - The main server implementationtest_budget_chat_server.py - Comprehensive unit testsKey features implemented:
Technical details:
Testing:
The server is ready to run and fully complies with the Budget Chat protocol specifications.