Claude Transcripts - 2-means-to-an-end

Write a python server implementing specs.txt

I'll help you implement a Python server based on the specs.txt file. Let me first read the specifications to understand what needs to be built.

{
  "file_path": "/home/smite/dev/protohackers/2-means-to-an-end/specs.txt"
}

     1→Your friendly neighbourhood investment bank is having trouble analysing historical price data. They need you to build a TCP server that will let clients insert and query timestamped prices.
   ...

     1→Your friendly neighbourhood investment bank is having trouble analysing historical price data. They need you to build a TCP server that will let clients insert and query timestamped prices.
     2→
     3→Overview
     4→Clients will connect to your server using TCP. Each client tracks the price of a different asset. Clients send messages to the server that either insert or query the prices.
     5→
     6→Each connection from a client is a separate session. Each session's data represents a different asset, so each session can only query the data supplied by itself.
     7→
     8→Message format
     9→To keep bandwidth usage down, a simple binary format has been specified.
    10→
    11→Each message from a client is 9 bytes long. Clients can send multiple messages per connection. Messages are not delimited by newlines or any other character: you'll know where one message ends and the next starts because they are always 9 bytes.
    12→
    13→Byte:  |  0  |  1     2     3     4  |  5     6     7     8  |
    14→Type:  |char |         int32         |         int32         |
    15→The first byte of a message is a character indicating its type. This will be an ASCII uppercase 'I' or 'Q' character, indicating whether the message inserts or queries prices, respectively.
    16→
    17→The next 8 bytes are two signed two's complement 32-bit integers in network byte order (big endian), whose meaning depends on the message type. We'll refer to these numbers as int32, but note this may differ from your system's native int32 type (if any), particularly with regard to byte order.
    18→
    19→Behaviour is undefined if the type specifier is not either 'I' or 'Q'.
    20→
    21→Insert
    22→An insert message lets the client insert a timestamped price.
    23→
    24→The message format is:
    25→
    26→Byte:  |  0  |  1     2     3     4  |  5     6     7     8  |
    27→Type:  |char |         int32         |         int32         |
    28→Value: | 'I' |       timestamp       |         price         |
    29→The first int32 is the timestamp, in seconds since 00:00, 1st Jan 1970.
    30→
    31→The second int32 is the price, in pennies, of this client's asset, at the given timestamp.
    32→
    33→Note that:
    34→
    35→Insertions may occur out-of-order.
    36→While rare, prices can go negative.
    37→Behaviour is undefined if there are multiple prices with the same timestamp from the same client.
    38→For example, to insert a price of 101 pence at timestamp 12345, a client would send:
    39→
    40→Hexadecimal: 49    00 00 30 39    00 00 00 65
    41→Decoded:      I          12345            101
    42→(Remember that you'll receive 9 raw bytes, rather than ASCII text representing hex-encoded data).
    43→
    44→Query
    45→A query message lets the client query the average price over a given time period.
    46→
    47→The message format is:
    48→
    49→Byte:  |  0  |  1     2     3     4  |  5     6     7     8  |
    50→Type:  |char |         int32         |         int32         |
    51→Value: | 'Q' |        mintime        |        maxtime        |
    52→The first int32 is mintime, the earliest timestamp of the period.
    53→
    54→The second int32 is maxtime, the latest timestamp of the period.
    55→
    56→The server must compute the mean of the inserted prices with timestamps T, mintime <= T <= maxtime (i.e. timestamps in the closed interval [mintime, maxtime]). If the mean is not an integer, it is acceptable to round either up or down, at the server's discretion.
    57→
    58→The server must then send the mean to the client as a single int32.
    59→
    60→If there are no samples within the requested period, or if mintime comes after maxtime, the value returned must be 0.
    61→
    62→For example, to query the mean price between T=1000 and T=100000, a client would send:
    63→
    64→Hexadecimal: 51    00 00 03 e8    00 01 86 a0
    65→Decoded:      Q           1000         100000
    66→And if the mean price during this time period were 5107 pence, the server would respond:
    67→
    68→Hexadecimal: 00 00 13 f3
    69→Decoded:            5107
    70→(Remember that you'll receive 9 raw bytes, and send 4 raw bytes, rather than ASCII text representing hex-encoded data).
    71→
    72→Example session
    73→In this example, "-->" denotes messages from the server to the client, and "<--" denotes messages from the client to the server.
    74→
    75→    Hexadecimal:                 Decoded:
    76→<-- 49 00 00 30 39 00 00 00 65   I 12345 101
    77→<-- 49 00 00 30 3a 00 00 00 66   I 12346 102
    78→<-- 49 00 00 30 3b 00 00 00 64   I 12347 100
    79→<-- 49 00 00 a0 00 00 00 00 05   I 40960 5
    80→<-- 51 00 00 30 00 00 00 40 00   Q 12288 16384
    81→--> 00 00 00 65                  101
    82→The client inserts (timestamp,price) values: (12345,101), (12346,102), (12347,100), and (40960,5). The client then queries between T=12288 and T=16384. The server computes the mean price during this period, which is 101, and sends back 101.
    83→
    84→Other requirements
    85→Make sure you can handle at least 5 simultaneous clients.
    86→
    87→Where a client triggers undefined behaviour, the server can do anything it likes for that client, but must not adversely affect other clients that did not trigger undefined behaviour.
    88→

<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 understand the requirements. I need to create a TCP server that handles binary messages for inserting and querying timestamped price data. Let me create a todo list to track this implementation:

[Request interrupted by user]

Write a python server implementing specs.txt, also add unittest

I'll implement a Python server based on specs.txt and add unit tests. Let me first read the specifications and then create a todo list to track the implementation.

{
  "file_path": "/home/smite/dev/protohackers/2-means-to-an-end/specs.txt"
}

     1→Your friendly neighbourhood investment bank is having trouble analysing historical price data. They need you to build a TCP server that will let clients insert and query timestamped prices.
   ...

     1→Your friendly neighbourhood investment bank is having trouble analysing historical price data. They need you to build a TCP server that will let clients insert and query timestamped prices.
     2→
     3→Overview
     4→Clients will connect to your server using TCP. Each client tracks the price of a different asset. Clients send messages to the server that either insert or query the prices.
     5→
     6→Each connection from a client is a separate session. Each session's data represents a different asset, so each session can only query the data supplied by itself.
     7→
     8→Message format
     9→To keep bandwidth usage down, a simple binary format has been specified.
    10→
    11→Each message from a client is 9 bytes long. Clients can send multiple messages per connection. Messages are not delimited by newlines or any other character: you'll know where one message ends and the next starts because they are always 9 bytes.
    12→
    13→Byte:  |  0  |  1     2     3     4  |  5     6     7     8  |
    14→Type:  |char |         int32         |         int32         |
    15→The first byte of a message is a character indicating its type. This will be an ASCII uppercase 'I' or 'Q' character, indicating whether the message inserts or queries prices, respectively.
    16→
    17→The next 8 bytes are two signed two's complement 32-bit integers in network byte order (big endian), whose meaning depends on the message type. We'll refer to these numbers as int32, but note this may differ from your system's native int32 type (if any), particularly with regard to byte order.
    18→
    19→Behaviour is undefined if the type specifier is not either 'I' or 'Q'.
    20→
    21→Insert
    22→An insert message lets the client insert a timestamped price.
    23→
    24→The message format is:
    25→
    26→Byte:  |  0  |  1     2     3     4  |  5     6     7     8  |
    27→Type:  |char |         int32         |         int32         |
    28→Value: | 'I' |       timestamp       |         price         |
    29→The first int32 is the timestamp, in seconds since 00:00, 1st Jan 1970.
    30→
    31→The second int32 is the price, in pennies, of this client's asset, at the given timestamp.
    32→
    33→Note that:
    34→
    35→Insertions may occur out-of-order.
    36→While rare, prices can go negative.
    37→Behaviour is undefined if there are multiple prices with the same timestamp from the same client.
    38→For example, to insert a price of 101 pence at timestamp 12345, a client would send:
    39→
    40→Hexadecimal: 49    00 00 30 39    00 00 00 65
    41→Decoded:      I          12345            101
    42→(Remember that you'll receive 9 raw bytes, rather than ASCII text representing hex-encoded data).
    43→
    44→Query
    45→A query message lets the client query the average price over a given time period.
    46→
    47→The message format is:
    48→
    49→Byte:  |  0  |  1     2     3     4  |  5     6     7     8  |
    50→Type:  |char |         int32         |         int32         |
    51→Value: | 'Q' |        mintime        |        maxtime        |
    52→The first int32 is mintime, the earliest timestamp of the period.
    53→
    54→The second int32 is maxtime, the latest timestamp of the period.
    55→
    56→The server must compute the mean of the inserted prices with timestamps T, mintime <= T <= maxtime (i.e. timestamps in the closed interval [mintime, maxtime]). If the mean is not an integer, it is acceptable to round either up or down, at the server's discretion.
    57→
    58→The server must then send the mean to the client as a single int32.
    59→
    60→If there are no samples within the requested period, or if mintime comes after maxtime, the value returned must be 0.
    61→
    62→For example, to query the mean price between T=1000 and T=100000, a client would send:
    63→
    64→Hexadecimal: 51    00 00 03 e8    00 01 86 a0
    65→Decoded:      Q           1000         100000
    66→And if the mean price during this time period were 5107 pence, the server would respond:
    67→
    68→Hexadecimal: 00 00 13 f3
    69→Decoded:            5107
    70→(Remember that you'll receive 9 raw bytes, and send 4 raw bytes, rather than ASCII text representing hex-encoded data).
    71→
    72→Example session
    73→In this example, "-->" denotes messages from the server to the client, and "<--" denotes messages from the client to the server.
    74→
    75→    Hexadecimal:                 Decoded:
    76→<-- 49 00 00 30 39 00 00 00 65   I 12345 101
    77→<-- 49 00 00 30 3a 00 00 00 66   I 12346 102
    78→<-- 49 00 00 30 3b 00 00 00 64   I 12347 100
    79→<-- 49 00 00 a0 00 00 00 00 05   I 40960 5
    80→<-- 51 00 00 30 00 00 00 40 00   Q 12288 16384
    81→--> 00 00 00 65                  101
    82→The client inserts (timestamp,price) values: (12345,101), (12346,102), (12347,100), and (40960,5). The client then queries between T=12288 and T=16384. The server computes the mean price during this period, which is 101, and sends back 101.
    83→
    84→Other requirements
    85→Make sure you can handle at least 5 simultaneous clients.
    86→
    87→Where a client triggers undefined behaviour, the server can do anything it likes for that client, but must not adversely affect other clients that did not trigger undefined behaviour.
    88→

<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>

⏳ Implement PriceServer class with TCP socket handling #1

⏳ Implement message parsing for 9-byte binary format (I/Q messages) #2

⏳ Implement insert functionality to store timestamp-price pairs per session #3

⏳ Implement query functionality to calculate mean price over time range #4

⏳ Handle concurrent clients (at least 5 simultaneous connections) #5

⏳ Write unit tests for message parsing, insert, and query operations #6

⏳ Write integration tests for the complete server functionality #7

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

🔄 Implement PriceServer class with TCP socket handling #1

⏳ Implement message parsing for 9-byte binary format (I/Q messages) #2

⏳ Implement insert functionality to store timestamp-price pairs per session #3

⏳ Implement query functionality to calculate mean price over time range #4

⏳ Handle concurrent clients (at least 5 simultaneous connections) #5

⏳ Write unit tests for message parsing, insert, and query operations #6

⏳ Write integration tests for the complete server functionality #7

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/2-means-to-an-end/server.py",
  "content": "#!/usr/bin/env python3\n\nimport socket\nimport struct\nimport threading\n...

{
  "file_path": "/home/smite/dev/protohackers/2-means-to-an-end/server.py",
  "content": "#!/usr/bin/env python3\n\nimport socket\nimport struct\nimport threading\nfrom typing import Dict, List, Tuple\n\n\nclass PriceSession:\n    def __init__(self):\n        self.prices: Dict[int, int] = {}\n    \n    def insert_price(self, timestamp: int, price: int):\n        self.prices[timestamp] = price\n    \n    def query_mean_price(self, mintime: int, maxtime: int) -> int:\n        if mintime > maxtime:\n            return 0\n        \n        relevant_prices = [\n            price for timestamp, price in self.prices.items()\n            if mintime <= timestamp <= maxtime\n        ]\n        \n        if not relevant_prices:\n            return 0\n        \n        return int(sum(relevant_prices) / len(relevant_prices))\n\n\nclass PriceServer:\n    def __init__(self, host: str = 'localhost', port: int = 12345):\n        self.host = host\n        self.port = port\n        self.server_socket = None\n        self.running = False\n    \n    def start(self):\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.host, self.port))\n        self.server_socket.listen(5)\n        self.running = True\n        \n        print(f\"Server listening on {self.host}:{self.port}\")\n        \n        try:\n            while self.running:\n                try:\n                    client_socket, client_address = self.server_socket.accept()\n                    print(f\"Client connected from {client_address}\")\n                    \n                    client_thread = threading.Thread(\n                        target=self.handle_client,\n                        args=(client_socket, client_address)\n                    )\n                    client_thread.daemon = True\n                    client_thread.start()\n                except socket.error:\n                    if self.running:\n                        print(\"Error accepting client connection\")\n        except KeyboardInterrupt:\n            print(\"\\nShutting down server...\")\n        finally:\n            self.stop()\n    \n    def stop(self):\n        self.running = False\n        if self.server_socket:\n            self.server_socket.close()\n    \n    def handle_client(self, client_socket: socket.socket, client_address: Tuple[str, int]):\n        session = PriceSession()\n        \n        try:\n            while True:\n                message = client_socket.recv(9)\n                if len(message) != 9:\n                    break\n                \n                message_type = chr(message[0])\n                int1, int2 = struct.unpack('>ii', message[1:9])\n                \n                if message_type == 'I':\n                    timestamp, price = int1, int2\n                    session.insert_price(timestamp, price)\n                elif message_type == 'Q':\n                    mintime, maxtime = int1, int2\n                    mean_price = session.query_mean_price(mintime, maxtime)\n                    response = struct.pack('>i', mean_price)\n                    client_socket.send(response)\n                else:\n                    break\n        except (socket.error, struct.error):\n            pass\n        finally:\n            client_socket.close()\n            print(f\"Client {client_address} disconnected\")\n\n\nif __name__ == \"__main__\":\n    server = PriceServer()\n    server.start()"
}

File created successfully at: /home/smite/dev/protohackers/2-means-to-an-end/server.py

✅ Implement PriceServer class with TCP socket handling #1

✅ Implement message parsing for 9-byte binary format (I/Q messages) #2

✅ Implement insert functionality to store timestamp-price pairs per session #3

✅ Implement query functionality to calculate mean price over time range #4

✅ Handle concurrent clients (at least 5 simultaneous connections) #5

🔄 Write unit tests for message parsing, insert, and query operations #6

⏳ Write integration tests for the complete server functionality #7

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/2-means-to-an-end/test_server.py",
  "content": "#!/usr/bin/env python3\n\nimport unittest\nimport socket\nimport stru...

{
  "file_path": "/home/smite/dev/protohackers/2-means-to-an-end/test_server.py",
  "content": "#!/usr/bin/env python3\n\nimport unittest\nimport socket\nimport struct\nimport threading\nimport time\nfrom server import PriceServer, PriceSession\n\n\nclass TestPriceSession(unittest.TestCase):\n    def setUp(self):\n        self.session = PriceSession()\n    \n    def test_insert_and_query_single_price(self):\n        self.session.insert_price(12345, 101)\n        mean = self.session.query_mean_price(12345, 12345)\n        self.assertEqual(mean, 101)\n    \n    def test_query_multiple_prices(self):\n        self.session.insert_price(12345, 101)\n        self.session.insert_price(12346, 102)\n        self.session.insert_price(12347, 100)\n        mean = self.session.query_mean_price(12345, 12347)\n        self.assertEqual(mean, 101)\n    \n    def test_query_partial_range(self):\n        self.session.insert_price(12345, 101)\n        self.session.insert_price(12346, 102)\n        self.session.insert_price(12347, 100)\n        self.session.insert_price(40960, 5)\n        mean = self.session.query_mean_price(12288, 16384)\n        self.assertEqual(mean, 101)\n    \n    def test_query_no_prices_in_range(self):\n        self.session.insert_price(12345, 101)\n        mean = self.session.query_mean_price(10000, 12000)\n        self.assertEqual(mean, 0)\n    \n    def test_query_invalid_range(self):\n        self.session.insert_price(12345, 101)\n        mean = self.session.query_mean_price(12346, 12345)\n        self.assertEqual(mean, 0)\n    \n    def test_negative_prices(self):\n        self.session.insert_price(12345, -50)\n        self.session.insert_price(12346, 50)\n        mean = self.session.query_mean_price(12345, 12346)\n        self.assertEqual(mean, 0)\n    \n    def test_out_of_order_insertions(self):\n        self.session.insert_price(12347, 100)\n        self.session.insert_price(12345, 101)\n        self.session.insert_price(12346, 102)\n        mean = self.session.query_mean_price(12345, 12347)\n        self.assertEqual(mean, 101)\n\n\nclass TestPriceServerIntegration(unittest.TestCase):\n    def setUp(self):\n        self.server = PriceServer('localhost', 0)\n        self.server_thread = threading.Thread(target=self.server.start)\n        self.server_thread.daemon = True\n        self.server_thread.start()\n        time.sleep(0.1)\n        \n        self.server_port = self.server.server_socket.getsockname()[1]\n    \n    def tearDown(self):\n        self.server.stop()\n        time.sleep(0.1)\n    \n    def create_insert_message(self, timestamp: int, price: int) -> bytes:\n        return b'I' + struct.pack('>ii', timestamp, price)\n    \n    def create_query_message(self, mintime: int, maxtime: int) -> bytes:\n        return b'Q' + struct.pack('>ii', mintime, maxtime)\n    \n    def test_single_client_session(self):\n        client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\n        client.connect(('localhost', self.server_port))\n        \n        try:\n            client.send(self.create_insert_message(12345, 101))\n            client.send(self.create_insert_message(12346, 102))\n            client.send(self.create_insert_message(12347, 100))\n            client.send(self.create_insert_message(40960, 5))\n            \n            client.send(self.create_query_message(12288, 16384))\n            \n            response = client.recv(4)\n            mean_price = struct.unpack('>i', response)[0]\n            self.assertEqual(mean_price, 101)\n        finally:\n            client.close()\n    \n    def test_multiple_clients_isolated_sessions(self):\n        client1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\n        client2 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\n        \n        try:\n            client1.connect(('localhost', self.server_port))\n            client2.connect(('localhost', self.server_port))\n            \n            client1.send(self.create_insert_message(1000, 100))\n            client2.send(self.create_insert_message(1000, 200))\n            \n            client1.send(self.create_query_message(1000, 1000))\n            client2.send(self.create_query_message(1000, 1000))\n            \n            response1 = client1.recv(4)\n            response2 = client2.recv(4)\n            \n            price1 = struct.unpack('>i', response1)[0]\n            price2 = struct.unpack('>i', response2)[0]\n            \n            self.assertEqual(price1, 100)\n            self.assertEqual(price2, 200)\n        finally:\n            client1.close()\n            client2.close()\n    \n    def test_example_session_from_spec(self):\n        client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\n        client.connect(('localhost', self.server_port))\n        \n        try:\n            expected_messages = [\n                (b'\\x49\\x00\\x00\\x30\\x39\\x00\\x00\\x00\\x65', None),\n                (b'\\x49\\x00\\x00\\x30\\x3a\\x00\\x00\\x00\\x66', None),  \n                (b'\\x49\\x00\\x00\\x30\\x3b\\x00\\x00\\x00\\x64', None),  \n                (b'\\x49\\x00\\x00\\xa0\\x00\\x00\\x00\\x00\\x05', None),  \n                (b'\\x51\\x00\\x00\\x30\\x00\\x00\\x00\\x40\\x00', b'\\x00\\x00\\x00\\x65'),  \n            ]\n            \n            for message, expected_response in expected_messages:\n                client.send(message)\n                if expected_response:\n                    response = client.recv(4)\n                    self.assertEqual(response, expected_response)\n        finally:\n            client.close()\n    \n    def test_query_with_no_data(self):\n        client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\n        client.connect(('localhost', self.server_port))\n        \n        try:\n            client.send(self.create_query_message(1000, 2000))\n            response = client.recv(4)\n            mean_price = struct.unpack('>i', response)[0]\n            self.assertEqual(mean_price, 0)\n        finally:\n            client.close()\n    \n    def test_query_invalid_range(self):\n        client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\n        client.connect(('localhost', self.server_port))\n        \n        try:\n            client.send(self.create_insert_message(1000, 100))\n            client.send(self.create_query_message(2000, 1000))\n            response = client.recv(4)\n            mean_price = struct.unpack('>i', response)[0]\n            self.assertEqual(mean_price, 0)\n        finally:\n            client.close()\n\n\nif __name__ == '__main__':\n    unittest.main()"
}

File created successfully at: /home/smite/dev/protohackers/2-means-to-an-end/test_server.py

✅ Implement PriceServer class with TCP socket handling #1

✅ Implement message parsing for 9-byte binary format (I/Q messages) #2

✅ Implement insert functionality to store timestamp-price pairs per session #3

✅ Implement query functionality to calculate mean price over time range #4

✅ Handle concurrent clients (at least 5 simultaneous connections) #5

✅ Write unit tests for message parsing, insert, and query operations #6

✅ Write integration tests for the complete server functionality #7

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

{
  "command": "python -m pytest test_server.py -v",
  "description": "Run unit tests to verify server implementation"
}

/bin/bash: line 1: python: command not found

{
  "command": "python3 test_server.py",
  "description": "Run unit tests using python3"
}

Server listening on localhost:0
Client connected from ('127.0.0.1', 32954)
Client ('127.0.0.1', 32954) disconnected
Server listening on localhost:0
Client connected from ('127...

Server listening on localhost:0
Client connected from ('127.0.0.1', 32954)
Client ('127.0.0.1', 32954) disconnected
Server listening on localhost:0
Client connected from ('127.0.0.1', 49514)
Client connected from ('127.0.0.1', 49530)
Client ('127.0.0.1', 49514) disconnected
Client ('127.0.0.1', 49530) disconnected
Server listening on localhost:0
Client connected from ('127.0.0.1', 54260)
Client ('127.0.0.1', 54260) disconnected
Server listening on localhost:0
Client connected from ('127.0.0.1', 39072)
Client ('127.0.0.1', 39072) disconnected
Server listening on localhost:0
Client connected from ('127.0.0.1', 55780)
Client ('127.0.0.1', 55780) disconnected
............
----------------------------------------------------------------------
Ran 12 tests in 1.008s

OK

Perfect! The implementation is working correctly. Let me also create a simple client script to demonstrate how to interact with the server:

{
  "file_path": "/home/smite/dev/protohackers/2-means-to-an-end/client_example.py",
  "content": "#!/usr/bin/env python3\n\nimport socket\nimport struct\n\n\ndef cr...

{
  "file_path": "/home/smite/dev/protohackers/2-means-to-an-end/client_example.py",
  "content": "#!/usr/bin/env python3\n\nimport socket\nimport struct\n\n\ndef create_insert_message(timestamp: int, price: int) -> bytes:\n    return b'I' + struct.pack('>ii', timestamp, price)\n\n\ndef create_query_message(mintime: int, maxtime: int) -> bytes:\n    return b'Q' + struct.pack('>ii', mintime, maxtime)\n\n\ndef main():\n    client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\n    \n    try:\n        client.connect(('localhost', 12345))\n        \n        print(\"Inserting price data...\")\n        client.send(create_insert_message(12345, 101))\n        client.send(create_insert_message(12346, 102))\n        client.send(create_insert_message(12347, 100))\n        client.send(create_insert_message(40960, 5))\n        \n        print(\"Querying mean price between T=12288 and T=16384...\")\n        client.send(create_query_message(12288, 16384))\n        \n        response = client.recv(4)\n        mean_price = struct.unpack('>i', response)[0]\n        print(f\"Mean price: {mean_price}\")\n        \n    finally:\n        client.close()\n\n\nif __name__ == \"__main__\":\n    main()"
}

File created successfully at: /home/smite/dev/protohackers/2-means-to-an-end/client_example.py

I've successfully implemented a Python server that meets all the specifications from specs.txt, including:

Server Features:

TCP server handling binary 9-byte messages with 'I' (insert) and 'Q' (query) operations
Insert messages store timestamp-price pairs per client session
Query messages calculate mean price over time ranges and return as 4-byte int32
Concurrent client support (at least 5 simultaneous connections)
Isolated sessions (each client's data is separate)
Proper handling of edge cases (no data, invalid ranges, negative prices)

Files Created:

server.py - Main server implementation
test_server.py - Comprehensive unit and integration tests
client_example.py - Example client for testing

Testing Results: All 12 tests pass, including:

Unit tests for PriceSession class
Integration tests with real TCP connections
Test of the exact example from the specification
Edge case testing (no data, invalid ranges, multiple clients)

The server correctly handles the binary protocol with big-endian 32-bit integers and implements all requirements from the specification.

The external testing is not working, please add debug logging to the server

I'll add comprehensive debug logging to help troubleshoot the external testing issues.

{
  "file_path": "/home/smite/dev/protohackers/2-means-to-an-end/server.py"
}

     1→#!/usr/bin/env python3
     2→
     3→import socket
     4→import struct
     5→import threading
     6→from typing import Dict, List, Tuple
     7→
     8→
     9→class PriceSession:
    10→  ...

     1→#!/usr/bin/env python3
     2→
     3→import socket
     4→import struct
     5→import threading
     6→from typing import Dict, List, Tuple
     7→
     8→
     9→class PriceSession:
    10→    def __init__(self):
    11→        self.prices: Dict[int, int] = {}
    12→    
    13→    def insert_price(self, timestamp: int, price: int):
    14→        self.prices[timestamp] = price
    15→    
    16→    def query_mean_price(self, mintime: int, maxtime: int) -> int:
    17→        if mintime > maxtime:
    18→            return 0
    19→        
    20→        relevant_prices = [
    21→            price for timestamp, price in self.prices.items()
    22→            if mintime <= timestamp <= maxtime
    23→        ]
    24→        
    25→        if not relevant_prices:
    26→            return 0
    27→        
    28→        return int(sum(relevant_prices) / len(relevant_prices))
    29→
    30→
    31→class PriceServer:
    32→    def __init__(self, host: str = '0.0.0.0', port: int = 12345):
    33→        self.host = host
    34→        self.port = port
    35→        self.server_socket = None
    36→        self.running = False
    37→    
    38→    def start(self):
    39→        self.server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    40→        self.server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    41→        self.server_socket.bind((self.host, self.port))
    42→        self.server_socket.listen(5)
    43→        self.running = True
    44→        
    45→        print(f"Server listening on {self.host}:{self.port}")
    46→        
    47→        try:
    48→            while self.running:
    49→                try:
    50→                    client_socket, client_address = self.server_socket.accept()
    51→                    print(f"Client connected from {client_address}")
    52→                    
    53→                    client_thread = threading.Thread(
    54→                        target=self.handle_client,
    55→                        args=(client_socket, client_address)
    56→                    )
    57→                    client_thread.daemon = True
    58→                    client_thread.start()
    59→                except socket.error:
    60→                    if self.running:
    61→                        print("Error accepting client connection")
    62→        except KeyboardInterrupt:
    63→            print("\nShutting down server...")
    64→        finally:
    65→            self.stop()
    66→    
    67→    def stop(self):
    68→        self.running = False
    69→        if self.server_socket:
    70→            self.server_socket.close()
    71→    
    72→    def handle_client(self, client_socket: socket.socket, client_address: Tuple[str, int]):
    73→        session = PriceSession()
    74→        
    75→        try:
    76→            while True:
    77→                message = client_socket.recv(9)
    78→                if len(message) != 9:
    79→                    break
    80→                
    81→                message_type = chr(message[0])
    82→                int1, int2 = struct.unpack('>ii', message[1:9])
    83→                
    84→                if message_type == 'I':
    85→                    timestamp, price = int1, int2
    86→                    session.insert_price(timestamp, price)
    87→                elif message_type == 'Q':
    88→                    mintime, maxtime = int1, int2
    89→                    mean_price = session.query_mean_price(mintime, maxtime)
    90→                    response = struct.pack('>i', mean_price)
    91→                    client_socket.send(response)
    92→                else:
    93→                    break
    94→        except (socket.error, struct.error):
    95→            pass
    96→        finally:
    97→            client_socket.close()
    98→            print(f"Client {client_address} disconnected")
    99→
   100→
   101→if __name__ == "__main__":
   102→    server = PriceServer()
   103→    server.start()
   104→

<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>

{
  "file_path": "/home/smite/dev/protohackers/2-means-to-an-end/server.py",
  "old_string": "#!/usr/bin/env python3\n\nimport socket\nimport struct\nimport threadin...

{
  "file_path": "/home/smite/dev/protohackers/2-means-to-an-end/server.py",
  "old_string": "#!/usr/bin/env python3\n\nimport socket\nimport struct\nimport threading\nfrom typing import Dict, List, Tuple\n\n\nclass PriceSession:\n    def __init__(self):\n        self.prices: Dict[int, int] = {}\n    \n    def insert_price(self, timestamp: int, price: int):\n        self.prices[timestamp] = price\n    \n    def query_mean_price(self, mintime: int, maxtime: int) -> int:\n        if mintime > maxtime:\n            return 0\n        \n        relevant_prices = [\n            price for timestamp, price in self.prices.items()\n            if mintime <= timestamp <= maxtime\n        ]\n        \n        if not relevant_prices:\n            return 0\n        \n        return int(sum(relevant_prices) / len(relevant_prices))",
  "new_string": "#!/usr/bin/env python3\n\nimport socket\nimport struct\nimport threading\nimport logging\nimport sys\nfrom typing import Dict, List, Tuple\n\nlogging.basicConfig(\n    level=logging.DEBUG,\n    format='%(asctime)s - %(levelname)s - [%(threadName)s] - %(message)s',\n    handlers=[\n        logging.StreamHandler(sys.stdout)\n    ]\n)\nlogger = logging.getLogger(__name__)\n\n\nclass PriceSession:\n    def __init__(self, client_id: str):\n        self.prices: Dict[int, int] = {}\n        self.client_id = client_id\n        logger.debug(f\"Created new session for client {client_id}\")\n    \n    def insert_price(self, timestamp: int, price: int):\n        self.prices[timestamp] = price\n        logger.debug(f\"Client {self.client_id}: Inserted price {price} at timestamp {timestamp}\")\n        logger.debug(f\"Client {self.client_id}: Session now has {len(self.prices)} price entries\")\n    \n    def query_mean_price(self, mintime: int, maxtime: int) -> int:\n        logger.debug(f\"Client {self.client_id}: Query range [{mintime}, {maxtime}]\")\n        \n        if mintime > maxtime:\n            logger.debug(f\"Client {self.client_id}: Invalid range (mintime > maxtime), returning 0\")\n            return 0\n        \n        relevant_prices = [\n            price for timestamp, price in self.prices.items()\n            if mintime <= timestamp <= maxtime\n        ]\n        \n        logger.debug(f\"Client {self.client_id}: Found {len(relevant_prices)} prices in range: {relevant_prices}\")\n        \n        if not relevant_prices:\n            logger.debug(f\"Client {self.client_id}: No prices in range, returning 0\")\n            return 0\n        \n        mean = int(sum(relevant_prices) / len(relevant_prices))\n        logger.debug(f\"Client {self.client_id}: Calculated mean: {mean}\")\n        return mean"
}

The file /home/smite/dev/protohackers/2-means-to-an-end/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
     1→#!/usr/bin/env python3
     2→
  ...

The file /home/smite/dev/protohackers/2-means-to-an-end/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
     1→#!/usr/bin/env python3
     2→
     3→import socket
     4→import struct
     5→import threading
     6→import logging
     7→import sys
     8→from typing import Dict, List, Tuple
     9→
    10→logging.basicConfig(
    11→    level=logging.DEBUG,
    12→    format='%(asctime)s - %(levelname)s - [%(threadName)s] - %(message)s',
    13→    handlers=[
    14→        logging.StreamHandler(sys.stdout)
    15→    ]
    16→)
    17→logger = logging.getLogger(__name__)
    18→
    19→
    20→class PriceSession:
    21→    def __init__(self, client_id: str):
    22→        self.prices: Dict[int, int] = {}
    23→        self.client_id = client_id
    24→        logger.debug(f"Created new session for client {client_id}")
    25→    
    26→    def insert_price(self, timestamp: int, price: int):
    27→        self.prices[timestamp] = price
    28→        logger.debug(f"Client {self.client_id}: Inserted price {price} at timestamp {timestamp}")
    29→        logger.debug(f"Client {self.client_id}: Session now has {len(self.prices)} price entries")
    30→    
    31→    def query_mean_price(self, mintime: int, maxtime: int) -> int:
    32→        logger.debug(f"Client {self.client_id}: Query range [{mintime}, {maxtime}]")
    33→        
    34→        if mintime > maxtime:
    35→            logger.debug(f"Client {self.client_id}: Invalid range (mintime > maxtime), returning 0")
    36→            return 0
    37→        
    38→        relevant_prices = [
    39→            price for timestamp, price in self.prices.items()
    40→            if mintime <= timestamp <= maxtime
    41→        ]
    42→        
    43→        logger.debug(f"Client {self.client_id}: Found {len(relevant_prices)} prices in range: {relevant_prices}")
    44→        
    45→        if not relevant_prices:
    46→            logger.debug(f"Client {self.client_id}: No prices in range, returning 0")
    47→            return 0
    48→        
    49→        mean = int(sum(relevant_prices) / len(relevant_prices))
    50→        logger.debug(f"Client {self.client_id}: Calculated mean: {mean}")
    51→        return mean
    52→
    53→
    54→class PriceServer:
    55→    def __init__(self, host: str = '0.0.0.0', port: int = 12345):

{
  "file_path": "/home/smite/dev/protohackers/2-means-to-an-end/server.py",
  "old_string": "    def start(self):\n        self.server_socket = socket.socket(socket...

{
  "file_path": "/home/smite/dev/protohackers/2-means-to-an-end/server.py",
  "old_string": "    def start(self):\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.host, self.port))\n        self.server_socket.listen(5)\n        self.running = True\n        \n        print(f\"Server listening on {self.host}:{self.port}\")\n        \n        try:\n            while self.running:\n                try:\n                    client_socket, client_address = self.server_socket.accept()\n                    print(f\"Client connected from {client_address}\")\n                    \n                    client_thread = threading.Thread(\n                        target=self.handle_client,\n                        args=(client_socket, client_address)\n                    )\n                    client_thread.daemon = True\n                    client_thread.start()\n                except socket.error:\n                    if self.running:\n                        print(\"Error accepting client connection\")\n        except KeyboardInterrupt:\n            print(\"\\nShutting down server...\")\n        finally:\n            self.stop()",
  "new_string": "    def start(self):\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.host, self.port))\n        self.server_socket.listen(5)\n        self.running = True\n        \n        logger.info(f\"Server listening on {self.host}:{self.port}\")\n        \n        try:\n            while self.running:\n                try:\n                    client_socket, client_address = self.server_socket.accept()\n                    logger.info(f\"Client connected from {client_address}\")\n                    \n                    client_thread = threading.Thread(\n                        target=self.handle_client,\n                        args=(client_socket, client_address)\n                    )\n                    client_thread.daemon = True\n                    client_thread.start()\n                except socket.error as e:\n                    if self.running:\n                        logger.error(f\"Error accepting client connection: {e}\")\n        except KeyboardInterrupt:\n            logger.info(\"Shutting down server...\")\n        finally:\n            self.stop()"
}

The file /home/smite/dev/protohackers/2-means-to-an-end/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    57→        self.port = port
    58→ ...

The file /home/smite/dev/protohackers/2-means-to-an-end/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    57→        self.port = port
    58→        self.server_socket = None
    59→        self.running = False
    60→    
    61→    def start(self):
    62→        self.server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    63→        self.server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    64→        self.server_socket.bind((self.host, self.port))
    65→        self.server_socket.listen(5)
    66→        self.running = True
    67→        
    68→        logger.info(f"Server listening on {self.host}:{self.port}")
    69→        
    70→        try:
    71→            while self.running:
    72→                try:
    73→                    client_socket, client_address = self.server_socket.accept()
    74→                    logger.info(f"Client connected from {client_address}")
    75→                    
    76→                    client_thread = threading.Thread(
    77→                        target=self.handle_client,
    78→                        args=(client_socket, client_address)
    79→                    )
    80→                    client_thread.daemon = True
    81→                    client_thread.start()
    82→                except socket.error as e:
    83→                    if self.running:
    84→                        logger.error(f"Error accepting client connection: {e}")
    85→        except KeyboardInterrupt:
    86→            logger.info("Shutting down server...")
    87→        finally:
    88→            self.stop()
    89→    
    90→    def stop(self):
    91→        self.running = False
    92→        if self.server_socket:

{
  "file_path": "/home/smite/dev/protohackers/2-means-to-an-end/server.py",
  "old_string": "    def stop(self):\n        self.running = False\n        if self.serv...

{
  "file_path": "/home/smite/dev/protohackers/2-means-to-an-end/server.py",
  "old_string": "    def stop(self):\n        self.running = False\n        if self.server_socket:\n            self.server_socket.close()\n    \n    def handle_client(self, client_socket: socket.socket, client_address: Tuple[str, int]):\n        session = PriceSession()\n        \n        try:\n            while True:\n                message = client_socket.recv(9)\n                if len(message) != 9:\n                    break\n                \n                message_type = chr(message[0])\n                int1, int2 = struct.unpack('>ii', message[1:9])\n                \n                if message_type == 'I':\n                    timestamp, price = int1, int2\n                    session.insert_price(timestamp, price)\n                elif message_type == 'Q':\n                    mintime, maxtime = int1, int2\n                    mean_price = session.query_mean_price(mintime, maxtime)\n                    response = struct.pack('>i', mean_price)\n                    client_socket.send(response)\n                else:\n                    break\n        except (socket.error, struct.error):\n            pass\n        finally:\n            client_socket.close()\n            print(f\"Client {client_address} disconnected\")",
  "new_string": "    def stop(self):\n        self.running = False\n        if self.server_socket:\n            self.server_socket.close()\n            logger.info(\"Server socket closed\")\n    \n    def handle_client(self, client_socket: socket.socket, client_address: Tuple[str, int]):\n        client_id = f\"{client_address[0]}:{client_address[1]}\"\n        session = PriceSession(client_id)\n        \n        try:\n            message_count = 0\n            while True:\n                logger.debug(f\"Client {client_id}: Waiting for message...\")\n                message = client_socket.recv(9)\n                \n                if len(message) == 0:\n                    logger.debug(f\"Client {client_id}: Connection closed by client (recv returned empty)\")\n                    break\n                    \n                if len(message) != 9:\n                    logger.warning(f\"Client {client_id}: Received message of incorrect length: {len(message)} bytes (expected 9)\")\n                    logger.debug(f\"Client {client_id}: Message bytes: {message.hex()}\")\n                    break\n                \n                message_count += 1\n                logger.debug(f\"Client {client_id}: Received message #{message_count}: {message.hex()}\")\n                \n                try:\n                    message_type = chr(message[0])\n                    int1, int2 = struct.unpack('>ii', message[1:9])\n                    logger.debug(f\"Client {client_id}: Parsed message type='{message_type}', int1={int1}, int2={int2}\")\n                except struct.error as e:\n                    logger.error(f\"Client {client_id}: Error unpacking message: {e}\")\n                    break\n                \n                if message_type == 'I':\n                    timestamp, price = int1, int2\n                    session.insert_price(timestamp, price)\n                elif message_type == 'Q':\n                    mintime, maxtime = int1, int2\n                    mean_price = session.query_mean_price(mintime, maxtime)\n                    response = struct.pack('>i', mean_price)\n                    logger.debug(f\"Client {client_id}: Sending response: {response.hex()} (mean={mean_price})\")\n                    bytes_sent = client_socket.send(response)\n                    logger.debug(f\"Client {client_id}: Sent {bytes_sent} bytes\")\n                else:\n                    logger.warning(f\"Client {client_id}: Unknown message type '{message_type}', disconnecting\")\n                    break\n                    \n        except socket.error as e:\n            logger.error(f\"Client {client_id}: Socket error: {e}\")\n        except struct.error as e:\n            logger.error(f\"Client {client_id}: Struct error: {e}\")\n        except Exception as e:\n            logger.error(f\"Client {client_id}: Unexpected error: {e}\")\n        finally:\n            client_socket.close()\n            logger.info(f\"Client {client_id} disconnected (processed {message_count} messages)\")"
}

The file /home/smite/dev/protohackers/2-means-to-an-end/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    86→            logger.info("Shu...

The file /home/smite/dev/protohackers/2-means-to-an-end/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    86→            logger.info("Shutting down server...")
    87→        finally:
    88→            self.stop()
    89→    
    90→    def stop(self):
    91→        self.running = False
    92→        if self.server_socket:
    93→            self.server_socket.close()
    94→            logger.info("Server socket closed")
    95→    
    96→    def handle_client(self, client_socket: socket.socket, client_address: Tuple[str, int]):
    97→        client_id = f"{client_address[0]}:{client_address[1]}"
    98→        session = PriceSession(client_id)
    99→        
   100→        try:
   101→            message_count = 0
   102→            while True:
   103→                logger.debug(f"Client {client_id}: Waiting for message...")
   104→                message = client_socket.recv(9)
   105→                
   106→                if len(message) == 0:
   107→                    logger.debug(f"Client {client_id}: Connection closed by client (recv returned empty)")
   108→                    break
   109→                    
   110→                if len(message) != 9:
   111→                    logger.warning(f"Client {client_id}: Received message of incorrect length: {len(message)} bytes (expected 9)")
   112→                    logger.debug(f"Client {client_id}: Message bytes: {message.hex()}")
   113→                    break
   114→                
   115→                message_count += 1
   116→                logger.debug(f"Client {client_id}: Received message #{message_count}: {message.hex()}")
   117→                
   118→                try:
   119→                    message_type = chr(message[0])
   120→                    int1, int2 = struct.unpack('>ii', message[1:9])
   121→                    logger.debug(f"Client {client_id}: Parsed message type='{message_type}', int1={int1}, int2={int2}")
   122→                except struct.error as e:
   123→                    logger.error(f"Client {client_id}: Error unpacking message: {e}")
   124→                    break
   125→                
   126→                if message_type == 'I':
   127→                    timestamp, price = int1, int2
   128→                    session.insert_price(timestamp, price)
   129→                elif message_type == 'Q':
   130→                    mintime, maxtime = int1, int2
   131→                    mean_price = session.query_mean_price(mintime, maxtime)
   132→                    response = struct.pack('>i', mean_price)
   133→                    logger.debug(f"Client {client_id}: Sending response: {response.hex()} (mean={mean_price})")
   134→                    bytes_sent = client_socket.send(response)
   135→                    logger.debug(f"Client {client_id}: Sent {bytes_sent} bytes")
   136→                else:
   137→                    logger.warning(f"Client {client_id}: Unknown message type '{message_type}', disconnecting")
   138→                    break
   139→                    
   140→        except socket.error as e:
   141→            logger.error(f"Client {client_id}: Socket error: {e}")
   142→        except struct.error as e:
   143→            logger.error(f"Client {client_id}: Struct error: {e}")
   144→        except Exception as e:
   145→            logger.error(f"Client {client_id}: Unexpected error: {e}")
   146→        finally:
   147→            client_socket.close()
   148→            logger.info(f"Client {client_id} disconnected (processed {message_count} messages)")
   149→
   150→
   151→if __name__ == "__main__":
   152→    server = PriceServer()

Now I need to update the test file to handle the new PriceSession constructor parameter:

{
  "file_path": "/home/smite/dev/protohackers/2-means-to-an-end/test_server.py",
  "old_string": "class TestPriceSession(unittest.TestCase):\n    def setUp(self):\n...

{
  "file_path": "/home/smite/dev/protohackers/2-means-to-an-end/test_server.py",
  "old_string": "class TestPriceSession(unittest.TestCase):\n    def setUp(self):\n        self.session = PriceSession()",
  "new_string": "class TestPriceSession(unittest.TestCase):\n    def setUp(self):\n        self.session = PriceSession(\"test_client\")"
}

The file /home/smite/dev/protohackers/2-means-to-an-end/test_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
     7→import time
     8→from serv...

The file /home/smite/dev/protohackers/2-means-to-an-end/test_server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
     7→import time
     8→from server import PriceServer, PriceSession
     9→
    10→
    11→class TestPriceSession(unittest.TestCase):
    12→    def setUp(self):
    13→        self.session = PriceSession("test_client")
    14→    
    15→    def test_insert_and_query_single_price(self):
    16→        self.session.insert_price(12345, 101)
    17→        mean = self.session.query_mean_price(12345, 12345)

Let's run the tests again to make sure everything still works with the debug logging:

{
  "command": "python3 test_server.py 2>/dev/null | grep -E \"(OK|FAILED|ERROR)\"",
  "description": "Run tests and filter output to see results"
...

{
  "command": "python3 test_server.py 2>/dev/null | grep -E \"(OK|FAILED|ERROR)\"",
  "description": "Run tests and filter output to see results"
}

Error

{
  "command": "python3 test_server.py",
  "description": "Run tests with full output"
}

2025-08-18 09:00:03,975 - INFO - [Thread-1 (start)] - Server listening on localhost:0
2025-08-18 09:00:04,075 - INFO - [Thread-1 (start)] - Client connected from ('127.0.0.1', 40552)
2025-08...

2025-08-18 09:00:03,975 - INFO - [Thread-1 (start)] - Server listening on localhost:0
2025-08-18 09:00:04,075 - INFO - [Thread-1 (start)] - Client connected from ('127.0.0.1', 40552)
2025-08-18 09:00:04,076 - DEBUG - [Thread-2 (handle_client)] - Created new session for client 127.0.0.1:40552
2025-08-18 09:00:04,076 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Waiting for message...
2025-08-18 09:00:04,076 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Received message #1: 490000303900000065
2025-08-18 09:00:04,076 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Parsed message type='I', int1=12345, int2=101
2025-08-18 09:00:04,076 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Inserted price 101 at timestamp 12345
2025-08-18 09:00:04,076 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Session now has 1 price entries
2025-08-18 09:00:04,076 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Waiting for message...
2025-08-18 09:00:04,076 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Received message #2: 490000303a00000066
2025-08-18 09:00:04,076 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Parsed message type='I', int1=12346, int2=102
2025-08-18 09:00:04,076 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Inserted price 102 at timestamp 12346
2025-08-18 09:00:04,076 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Session now has 2 price entries
2025-08-18 09:00:04,076 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Waiting for message...
2025-08-18 09:00:04,076 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Received message #3: 490000303b00000064
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Parsed message type='I', int1=12347, int2=100
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Inserted price 100 at timestamp 12347
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Session now has 3 price entries
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Waiting for message...
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Received message #4: 490000a00000000005
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Parsed message type='I', int1=40960, int2=5
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Inserted price 5 at timestamp 40960
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Session now has 4 price entries
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Waiting for message...
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Received message #5: 510000300000004000
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Parsed message type='Q', int1=12288, int2=16384
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Query range [12288, 16384]
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Found 3 prices in range: [101, 102, 100]
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Calculated mean: 101
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Sending response: 00000065 (mean=101)
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Sent 4 bytes
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Waiting for message...
2025-08-18 09:00:04,077 - INFO - [MainThread] - Server socket closed
2025-08-18 09:00:04,077 - DEBUG - [Thread-2 (handle_client)] - Client 127.0.0.1:40552: Connection closed by client (recv returned empty)
2025-08-18 09:00:04,077 - INFO - [Thread-2 (handle_client)] - Client 127.0.0.1:40552 disconnected (processed 5 messages)
2025-08-18 09:00:04,178 - INFO - [Thread-3 (start)] - Server listening on localhost:0
2025-08-18 09:00:04,278 - INFO - [Thread-3 (start)] - Client connected from ('127.0.0.1', 35942)
2025-08-18 09:00:04,278 - DEBUG - [Thread-4 (handle_client)] - Created new session for client 127.0.0.1:35942
2025-08-18 09:00:04,279 - DEBUG - [Thread-4 (handle_client)] - Client 127.0.0.1:35942: Waiting for message...
2025-08-18 09:00:04,279 - INFO - [Thread-3 (start)] - Client connected from ('127.0.0.1', 35950)
2025-08-18 09:00:04,279 - DEBUG - [Thread-4 (handle_client)] - Client 127.0.0.1:35942: Received message #1: 49000003e800000064
2025-08-18 09:00:04,279 - DEBUG - [Thread-4 (handle_client)] - Client 127.0.0.1:35942: Parsed message type='I', int1=1000, int2=100
2025-08-18 09:00:04,279 - DEBUG - [Thread-4 (handle_client)] - Client 127.0.0.1:35942: Inserted price 100 at timestamp 1000
2025-08-18 09:00:04,279 - DEBUG - [Thread-5 (handle_client)] - Created new session for client 127.0.0.1:35950
2025-08-18 09:00:04,279 - DEBUG - [Thread-4 (handle_client)] - Client 127.0.0.1:35942: Session now has 1 price entries
2025-08-18 09:00:04,279 - DEBUG - [Thread-5 (handle_client)] - Client 127.0.0.1:35950: Waiting for message...
2025-08-18 09:00:04,279 - DEBUG - [Thread-4 (handle_client)] - Client 127.0.0.1:35942: Waiting for message...
2025-08-18 09:00:04,279 - DEBUG - [Thread-4 (handle_client)] - Client 127.0.0.1:35942: Received message #2: 51000003e8000003e8
2025-08-18 09:00:04,279 - DEBUG - [Thread-4 (handle_client)] - Client 127.0.0.1:35942: Parsed message type='Q', int1=1000, int2=1000
2025-08-18 09:00:04,279 - DEBUG - [Thread-4 (handle_client)] - Client 127.0.0.1:35942: Query range [1000, 1000]
2025-08-18 09:00:04,280 - DEBUG - [Thread-4 (handle_client)] - Client 127.0.0.1:35942: Found 1 prices in range: [100]
2025-08-18 09:00:04,280 - DEBUG - [Thread-4 (handle_client)] - Client 127.0.0.1:35942: Calculated mean: 100
2025-08-18 09:00:04,280 - DEBUG - [Thread-5 (handle_client)] - Client 127.0.0.1:35950: Received message #1: 49000003e8000000c8
2025-08-18 09:00:04,280 - DEBUG - [Thread-4 (handle_client)] - Client 127.0.0.1:35942: Sending response: 00000064 (mean=100)
2025-08-18 09:00:04,280 - DEBUG - [Thread-4 (handle_client)] - Client 127.0.0.1:35942: Sent 4 bytes
2025-08-18 09:00:04,280 - DEBUG - [Thread-4 (handle_client)] - Client 127.0.0.1:35942: Waiting for message...
2025-08-18 09:00:04,280 - DEBUG - [Thread-5 (handle_client)] - Client 127.0.0.1:35950: Parsed message type='I', int1=1000, int2=200
2025-08-18 09:00:04,280 - DEBUG - [Thread-5 (handle_client)] - Client 127.0.0.1:35950: Inserted price 200 at timestamp 1000
2025-08-18 09:00:04,280 - DEBUG - [Thread-5 (handle_client)] - Client 127.0.0.1:35950: Session now has 1 price entries
2025-08-18 09:00:04,280 - DEBUG - [Thread-5 (handle_client)] - Client 127.0.0.1:35950: Waiting for message...
2025-08-18 09:00:04,280 - DEBUG - [Thread-5 (handle_client)] - Client 127.0.0.1:35950: Received message #2: 51000003e8000003e8
2025-08-18 09:00:04,280 - DEBUG - [Thread-5 (handle_client)] - Client 127.0.0.1:35950: Parsed message type='Q', int1=1000, int2=1000
2025-08-18 09:00:04,280 - DEBUG - [Thread-5 (handle_client)] - Client 127.0.0.1:35950: Query range [1000, 1000]
2025-08-18 09:00:04,280 - DEBUG - [Thread-5 (handle_client)] - Client 127.0.0.1:35950: Found 1 prices in range: [200]
2025-08-18 09:00:04,280 - DEBUG - [Thread-5 (handle_client)] - Client 127.0.0.1:35950: Calculated mean: 200
2025-08-18 09:00:04,280 - DEBUG - [Thread-5 (handle_client)] - Client 127.0.0.1:35950: Sending response: 000000c8 (mean=200)
2025-08-18 09:00:04,280 - DEBUG - [Thread-5 (handle_client)] - Client 127.0.0.1:35950: Sent 4 bytes
2025-08-18 09:00:04,280 - DEBUG - [Thread-5 (handle_client)] - Client 127.0.0.1:35950: Waiting for message...
2025-08-18 09:00:04,280 - INFO - [MainThread] - Server socket closed
2025-08-18 09:00:04,280 - DEBUG - [Thread-4 (handle_client)] - Client 127.0.0.1:35942: Connection closed by client (recv returned empty)
2025-08-18 09:00:04,281 - INFO - [Thread-4 (handle_client)] - Client 127.0.0.1:35942 disconnected (processed 2 messages)
2025-08-18 09:00:04,281 - DEBUG - [Thread-5 (handle_client)] - Client 127.0.0.1:35950: Connection closed by client (recv returned empty)
2025-08-18 09:00:04,281 - INFO - [Thread-5 (handle_client)] - Client 127.0.0.1:35950 disconnected (processed 2 messages)
2025-08-18 09:00:04,381 - INFO - [Thread-6 (start)] - Server listening on localhost:0
2025-08-18 09:00:04,481 - INFO - [Thread-6 (start)] - Client connected from ('127.0.0.1', 44036)
2025-08-18 09:00:04,482 - DEBUG - [Thread-7 (handle_client)] - Created new session for client 127.0.0.1:44036
2025-08-18 09:00:04,482 - DEBUG - [Thread-7 (handle_client)] - Client 127.0.0.1:44036: Waiting for message...
2025-08-18 09:00:04,482 - DEBUG - [Thread-7 (handle_client)] - Client 127.0.0.1:44036: Received message #1: 49000003e800000064
2025-08-18 09:00:04,482 - DEBUG - [Thread-7 (handle_client)] - Client 127.0.0.1:44036: Parsed message type='I', int1=1000, int2=100
2025-08-18 09:00:04,482 - DEBUG - [Thread-7 (handle_client)] - Client 127.0.0.1:44036: Inserted price 100 at timestamp 1000
2025-08-18 09:00:04,482 - DEBUG - [Thread-7 (handle_client)] - Client 127.0.0.1:44036: Session now has 1 price entries
2025-08-18 09:00:04,482 - DEBUG - [Thread-7 (handle_client)] - Client 127.0.0.1:44036: Waiting for message...
2025-08-18 09:00:04,482 - DEBUG - [Thread-7 (handle_client)] - Client 127.0.0.1:44036: Received message #2: 51000007d0000003e8
2025-08-18 09:00:04,482 - DEBUG - [Thread-7 (handle_client)] - Client 127.0.0.1:44036: Parsed message type='Q', int1=2000, int2=1000
2025-08-18 09:00:04,482 - DEBUG - [Thread-7 (handle_client)] - Client 127.0.0.1:44036: Query range [2000, 1000]
2025-08-18 09:00:04,482 - DEBUG - [Thread-7 (handle_client)] - Client 127.0.0.1:44036: Invalid range (mintime > maxtime), returning 0
2025-08-18 09:00:04,482 - DEBUG - [Thread-7 (handle_client)] - Client 127.0.0.1:44036: Sending response: 00000000 (mean=0)
2025-08-18 09:00:04,482 - DEBUG - [Thread-7 (handle_client)] - Client 127.0.0.1:44036: Sent 4 bytes
2025-08-18 09:00:04,482 - DEBUG - [Thread-7 (handle_client)] - Client 127.0.0.1:44036: Waiting for message...
2025-08-18 09:00:04,482 - INFO - [MainThread] - Server socket closed
2025-08-18 09:00:04,482 - DEBUG - [Thread-7 (handle_client)] - Client 127.0.0.1:44036: Connection closed by client (recv returned empty)
2025-08-18 09:00:04,482 - INFO - [Thread-7 (handle_client)] - Client 127.0.0.1:44036 disconnected (processed 2 messages)
2025-08-18 09:00:04,583 - INFO - [Thread-8 (start)] - Server listening on localhost:0
2025-08-18 09:00:04,683 - INFO - [Thread-8 (start)] - Client connected from ('127.0.0.1', 51114)
2025-08-18 09:00:04,684 - DEBUG - [Thread-9 (handle_client)] - Created new session for client 127.0.0.1:51114
2025-08-18 09:00:04,684 - DEBUG - [Thread-9 (handle_client)] - Client 127.0.0.1:51114: Waiting for message...
2025-08-18 09:00:04,684 - DEBUG - [Thread-9 (handle_client)] - Client 127.0.0.1:51114: Received message #1: 51000003e8000007d0
2025-08-18 09:00:04,684 - DEBUG - [Thread-9 (handle_client)] - Client 127.0.0.1:51114: Parsed message type='Q', int1=1000, int2=2000
2025-08-18 09:00:04,684 - DEBUG - [Thread-9 (handle_client)] - Client 127.0.0.1:51114: Query range [1000, 2000]
2025-08-18 09:00:04,684 - DEBUG - [Thread-9 (handle_client)] - Client 127.0.0.1:51114: Found 0 prices in range: []
2025-08-18 09:00:04,684 - DEBUG - [Thread-9 (handle_client)] - Client 127.0.0.1:51114: No prices in range, returning 0
2025-08-18 09:00:04,684 - DEBUG - [Thread-9 (handle_client)] - Client 127.0.0.1:51114: Sending response: 00000000 (mean=0)
2025-08-18 09:00:04,684 - DEBUG - [Thread-9 (handle_client)] - Client 127.0.0.1:51114: Sent 4 bytes
2025-08-18 09:00:04,684 - DEBUG - [Thread-9 (handle_client)] - Client 127.0.0.1:51114: Waiting for message...
2025-08-18 09:00:04,684 - INFO - [MainThread] - Server socket closed
2025-08-18 09:00:04,684 - DEBUG - [Thread-9 (handle_client)] - Client 127.0.0.1:51114: Connection closed by client (recv returned empty)
2025-08-18 09:00:04,684 - INFO - [Thread-9 (handle_client)] - Client 127.0.0.1:51114 disconnected (processed 1 messages)
2025-08-18 09:00:04,785 - INFO - [Thread-10 (start)] - Server listening on localhost:0
2025-08-18 09:00:04,885 - INFO - [Thread-10 (start)] - Client connected from ('127.0.0.1', 57550)
2025-08-18 09:00:04,886 - DEBUG - [Thread-11 (handle_client)] - Created new session for client 127.0.0.1:57550
2025-08-18 09:00:04,886 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Waiting for message...
2025-08-18 09:00:04,886 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Received message #1: 490000303900000065
2025-08-18 09:00:04,886 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Parsed message type='I', int1=12345, int2=101
2025-08-18 09:00:04,886 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Inserted price 101 at timestamp 12345
2025-08-18 09:00:04,886 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Session now has 1 price entries
2025-08-18 09:00:04,886 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Waiting for message...
2025-08-18 09:00:04,886 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Received message #2: 490000303a00000066
2025-08-18 09:00:04,886 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Parsed message type='I', int1=12346, int2=102
2025-08-18 09:00:04,886 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Inserted price 102 at timestamp 12346
2025-08-18 09:00:04,886 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Session now has 2 price entries
2025-08-18 09:00:04,886 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Waiting for message...
2025-08-18 09:00:04,886 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Received message #3: 490000303b00000064
2025-08-18 09:00:04,886 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Parsed message type='I', int1=12347, int2=100
2025-08-18 09:00:04,886 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Inserted price 100 at timestamp 12347
2025-08-18 09:00:04,886 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Session now has 3 price entries
2025-08-18 09:00:04,886 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Waiting for message...
2025-08-18 09:00:04,887 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Received message #4: 490000a00000000005
2025-08-18 09:00:04,887 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Parsed message type='I', int1=40960, int2=5
2025-08-18 09:00:04,887 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Inserted price 5 at timestamp 40960
2025-08-18 09:00:04,887 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Session now has 4 price entries
2025-08-18 09:00:04,887 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Waiting for message...
2025-08-18 09:00:04,887 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Received message #5: 510000300000004000
2025-08-18 09:00:04,887 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Parsed message type='Q', int1=12288, int2=16384
2025-08-18 09:00:04,887 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Query range [12288, 16384]
2025-08-18 09:00:04,887 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Found 3 prices in range: [101, 102, 100]
2025-08-18 09:00:04,887 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Calculated mean: 101
2025-08-18 09:00:04,887 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Sending response: 00000065 (mean=101)
2025-08-18 09:00:04,887 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Sent 4 bytes
2025-08-18 09:00:04,887 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Waiting for message...
2025-08-18 09:00:04,887 - INFO - [MainThread] - Server socket closed
2025-08-18 09:00:04,887 - DEBUG - [Thread-11 (handle_client)] - Client 127.0.0.1:57550: Connection closed by client (recv returned empty)
2025-08-18 09:00:04,887 - INFO - [Thread-11 (handle_client)] - Client 127.0.0.1:57550 disconnected (processed 5 messages)
2025-08-18 09:00:04,988 - DEBUG - [MainThread] - Created new session for client test_client
2025-08-18 09:00:04,988 - DEBUG - [MainThread] - Client test_client: Inserted price 101 at timestamp 12345
2025-08-18 09:00:04,988 - DEBUG - [MainThread] - Client test_client: Session now has 1 price entries
2025-08-18 09:00:04,988 - DEBUG - [MainThread] - Client test_client: Query range [12345, 12345]
2025-08-18 09:00:04,988 - DEBUG - [MainThread] - Client test_client: Found 1 prices in range: [101]
2025-08-18 09:00:04,988 - DEBUG - [MainThread] - Client test_client: Calculated mean: 101
2025-08-18 09:00:04,988 - DEBUG - [MainThread] - Created new session for client test_client
2025-08-18 09:00:04,988 - DEBUG - [MainThread] - Client test_client: Inserted price -50 at timestamp 12345
2025-08-18 09:00:04,988 - DEBUG - [MainThread] - Client test_client: Session now has 1 price entries
2025-08-18 09:00:04,988 - DEBUG - [MainThread] - Client test_client: Inserted price 50 at timestamp 12346
2025-08-18 09:00:04,988 - DEBUG - [MainThread] - Client test_client: Session now has 2 price entries
2025-08-18 09:00:04,988 - DEBUG - [MainThread] - Client test_client: Query range [12345, 12346]
2025-08-18 09:00:04,988 - DEBUG - [MainThread] - Client test_client: Found 2 prices in range: [-50, 50]
2025-08-18 09:00:04,988 - DEBUG - [MainThread] - Client test_client: Calculated mean: 0
2025-08-18 09:00:04,988 - DEBUG - [MainThread] - Created new session for client test_client
2025-08-18 09:00:04,988 - DEBUG - [MainThread] - Client test_client: Inserted price 100 at timestamp 12347
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Session now has 1 price entries
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Inserted price 101 at timestamp 12345
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Session now has 2 price entries
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Inserted price 102 at timestamp 12346
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Session now has 3 price entries
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Query range [12345, 12347]
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Found 3 prices in range: [100, 101, 102]
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Calculated mean: 101
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Created new session for client test_client
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Inserted price 101 at timestamp 12345
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Session now has 1 price entries
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Query range [12346, 12345]
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Invalid range (mintime > maxtime), returning 0
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Created new session for client test_client
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Inserted price 101 at timestamp 12345
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Session now has 1 price entries
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Inserted price 102 at timestamp 12346
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Session now has 2 price entries
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Inserted price 100 at timestamp 12347
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Session now has 3 price entries
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Query range [12345, 12347]
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Found 3 prices in range: [101, 102, 100]
2025-08-18 09:00:04,989 - DEBUG - [MainThread] - Client test_client: Calculated mean: 101
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Created new session for client test_client
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Client test_client: Inserted price 101 at timestamp 12345
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Client test_client: Session now has 1 price entries
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Client test_client: Query range [10000, 12000]
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Client test_client: Found 0 prices in range: []
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Client test_client: No prices in range, returning 0
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Created new session for client test_client
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Client test_client: Inserted price 101 at timestamp 12345
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Client test_client: Session now has 1 price entries
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Client test_client: Inserted price 102 at timestamp 12346
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Client test_client: Session now has 2 price entries
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Client test_client: Inserted price 100 at timestamp 12347
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Client test_client: Session now has 3 price entries
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Client test_client: Inserted price 5 at timestamp 40960
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Client test_client: Session now has 4 price entries
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Client test_client: Query range [12288, 16384]
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Client test_client: Found 3 prices in range: [101, 102, 100]
2025-08-18 09:00:04,990 - DEBUG - [MainThread] - Client test_client: Calculated mean: 101
............
----------------------------------------------------------------------
Ran 12 tests in 1.016s

OK

Perfect! The server now has comprehensive debug logging that shows:

Connection Management: When clients connect/disconnect
Message Processing: Hex dump of all incoming messages with parsed content
Data Operations: Insert operations with timestamp/price details
Query Processing: Range queries with found prices and calculated means
Session Isolation: Each client gets their own session ID
Error Handling: Detailed logging of socket errors, message parsing issues, etc.

The debug output shows the server is working correctly:

Messages are being received as 9-byte hex strings (e.g., 490000303900000065 for Insert 12345, 101)
Queries correctly find relevant prices in time ranges
Mean calculations are accurate (e.g., [101, 102, 100] → mean 101)
Session isolation works (different clients maintain separate data)

This comprehensive logging will help identify any issues when external testing occurs. The server is now ready for debugging any protocol or communication problems.

Run the server for 30 seconds, I will run the external validation tests and see what the server is doing wrong.

I'll start the server with debug logging for 30 seconds so you can run your external validation tests.

{
  "command": "timeout 30 python3 server.py",
  "description": "Run server for 30 seconds with debug logging"
}

2025-08-18 09:00:51,543 - INFO - [MainThread] - Server listening on 0.0.0.0:12345
2025-08-18 09:00:56,088 - INFO - [MainThread] - Client connected from ('206.189.113.124', 42002)
2025-08-18 ...

2025-08-18 09:00:51,543 - INFO - [MainThread] - Server listening on 0.0.0.0:12345
2025-08-18 09:00:56,088 - INFO - [MainThread] - Client connected from ('206.189.113.124', 42002)
2025-08-18 09:00:56,089 - DEBUG - [Thread-1 (handle_client)] - Created new session for client 206.189.113.124:42002
2025-08-18 09:00:56,089 - DEBUG - [Thread-1 (handle_client)] - Client 206.189.113.124:42002: Waiting for message...
2025-08-18 09:00:56,089 - WARNING - [Thread-1 (handle_client)] - Client 206.189.113.124:42002: Received message of incorrect length: 1 bytes (expected 9)
2025-08-18 09:00:56,090 - DEBUG - [Thread-1 (handle_client)] - Client 206.189.113.124:42002: Message bytes: 49
2025-08-18 09:00:56,090 - INFO - [Thread-1 (handle_client)] - Client 206.189.113.124:42002 disconnected (processed 0 messages)

I can see the issue! The external test sent only 1 byte (49 which is 'I' in hex) instead of the expected 9 bytes. This suggests the external test might be sending data in smaller chunks or there's a buffering issue.

Let me modify the server to handle partial message reads by accumulating bytes until we have a complete 9-byte message:

{
  "file_path": "/home/smite/dev/protohackers/2-means-to-an-end/server.py",
  "old_string": "        try:\n            message_count = 0\n            while True:\n ...

{
  "file_path": "/home/smite/dev/protohackers/2-means-to-an-end/server.py",
  "old_string": "        try:\n            message_count = 0\n            while True:\n                logger.debug(f\"Client {client_id}: Waiting for message...\")\n                message = client_socket.recv(9)\n                \n                if len(message) == 0:\n                    logger.debug(f\"Client {client_id}: Connection closed by client (recv returned empty)\")\n                    break\n                    \n                if len(message) != 9:\n                    logger.warning(f\"Client {client_id}: Received message of incorrect length: {len(message)} bytes (expected 9)\")\n                    logger.debug(f\"Client {client_id}: Message bytes: {message.hex()}\")\n                    break",
  "new_string": "        try:\n            message_count = 0\n            while True:\n                logger.debug(f\"Client {client_id}: Waiting for message...\")\n                \n                # Read exactly 9 bytes by accumulating partial reads\n                message = b''\n                while len(message) < 9:\n                    chunk = client_socket.recv(9 - len(message))\n                    if len(chunk) == 0:\n                        logger.debug(f\"Client {client_id}: Connection closed by client (recv returned empty)\")\n                        break\n                    message += chunk\n                    logger.debug(f\"Client {client_id}: Received {len(chunk)} bytes, total {len(message)}/9\")\n                \n                if len(message) == 0:\n                    break\n                    \n                if len(message) != 9:\n                    logger.warning(f\"Client {client_id}: Incomplete message received: {len(message)} bytes (expected 9)\")\n                    logger.debug(f\"Client {client_id}: Partial message bytes: {message.hex()}\")\n                    break"
}

The file /home/smite/dev/protohackers/2-means-to-an-end/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    96→    def handle_client(self, clien...

The file /home/smite/dev/protohackers/2-means-to-an-end/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    96→    def handle_client(self, client_socket: socket.socket, client_address: Tuple[str, int]):
    97→        client_id = f"{client_address[0]}:{client_address[1]}"
    98→        session = PriceSession(client_id)
    99→        
   100→        try:
   101→            message_count = 0
   102→            while True:
   103→                logger.debug(f"Client {client_id}: Waiting for message...")
   104→                
   105→                # Read exactly 9 bytes by accumulating partial reads
   106→                message = b''
   107→                while len(message) < 9:
   108→                    chunk = client_socket.recv(9 - len(message))
   109→                    if len(chunk) == 0:
   110→                        logger.debug(f"Client {client_id}: Connection closed by client (recv returned empty)")
   111→                        break
   112→                    message += chunk
   113→                    logger.debug(f"Client {client_id}: Received {len(chunk)} bytes, total {len(message)}/9")
   114→                
   115→                if len(message) == 0:
   116→                    break
   117→                    
   118→                if len(message) != 9:
   119→                    logger.warning(f"Client {client_id}: Incomplete message received: {len(message)} bytes (expected 9)")
   120→                    logger.debug(f"Client {client_id}: Partial message bytes: {message.hex()}")
   121→                    break
   122→                
   123→                message_count += 1
   124→                logger.debug(f"Client {client_id}: Received message #{message_count}: {message.hex()}")
   125→

Now let's run the server again for 30 seconds with the improved message handling:

{
  "command": "timeout 30 python3 server.py",
  "description": "Run server for 30 seconds with improved message handling"
}

2025-08-18 09:01:35,442 - INFO - [MainThread] - Server listening on 0.0.0.0:12345

The server is now running and waiting for connections. The improved code will handle partial message reads properly by accumulating bytes until it has a complete 9-byte message. You can now run your external validation tests and we'll see detailed logging of what's happening.

Claude Transcripts - 2-means-to-an-end

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