protohackers: create a 11-pest-control/server.py that conforms t...

     1→To control animal populations across a number of different sites, we need you to make a server that will receive reports of animal populations, compare to the desired population range for each species at that site, and advise the relevant authority to instate policies to cull or conserve particular species as appropriate.
     2→
     3→Clients will connect to your server over TCP and provide the observations from site visits, listing the total population count for each observed species.
     4→
     5→Your server will connect to the Authority Server, also over TCP, dial the given site, receive the desired population range for each species that is controlled at that site, and then send instructions to create and delete population control policies, according to the observed populations from the most recent site visit.
     6→
     7→You can connect to the Authority Server at pestcontrol.protohackers.com on TCP port 20547, over both IPv4 and IPv6.
     8→
     9→Protocol
    10→Data types
    11→The protocol uses a binary data format, with the following primitive types:
    12→
    13→u32
    14→An unsigned 32-bit integer transmitted in network byte-order (big endian).
    15→
    16→Examples:
    17→
    18→Type | Hex data    | Value
    19→-------------------------------
    20→u32  | 00 00 00 20 |         32
    21→u32  | 00 00 12 45 |       4677
    22→u32  | a6 a9 b5 67 | 2796139879
    23→str
    24→A string of characters in a length-prefixed format. A str is transmitted as a single u32 containing the string's length, followed by that many bytes of ASCII character codes.
    25→
    26→It is an error for the string's specified length to go beyond the length of the containing message.
    27→
    28→Examples:
    29→
    30→Type | Hex data                            | Value
    31→-------------------------------------------------------
    32→str  | 00 00 00 00                         | ""
    33→str  | 00 00 00 03 66 6f 6f                | "foo"
    34→str  | 00 00 00 08 45 6C 62 65 72 65 74 68 | "Elbereth"
    35→Arrays
    36→Arrays are described in the type specification by grouping a series of element fields with curly braces {}, followed by ..., in square brackets []. Arrays are represented over the network with a u32 defining the number of elements, followed by that number of elements concatenated together.
    37→
    38→It is an error for the length of the array's contents to go beyond the length of the containing message.
    39→
    40→Example type:
    41→
    42→[{species: str, count: u32}, ...]
    43→Example data:
    44→
    45→[{species:"rat",count:10}, {species:"dog",count:15}]
    46→Example bytes:
    47→
    48→Hexadecimal:            Decoded:
    49→00 00 00 02             (length 2) [
    50→                          {
    51→00 00 00 03 72 61 74        species: (length 3) "rat",
    52→00 00 00 0a                 count: 10,
    53→                          },
    54→                          {
    55→00 00 00 03 64 6f 67        species: (length 3) "dog",
    56→00 00 00 0f                 count: 15
    57→                          },
    58→                        ],
    59→Checksum
    60→The bytes in a message must sum to 0 (modulo 256). This is achieved by controlling the checksum byte, which is the last byte of the message.
    61→
    62→For example, if the bytes of a message (excluding the checksum byte) sum to 254, then the checksum byte must be 0x02.
    63→
    64→It is an error to send a message with an incorrect checksum.
    65→
    66→Sites
    67→A site is a physical location. Each site is identified by a unique u32 "site ID".
    68→
    69→Species
    70→A species is a type of animal, identified by a str. These strings don't necessarily bear any resemblance to any species nomenclature you may be familiar with, and indeed the animals referred to may not be animals you are familiar with. Consider the species names to be opaque string data for the purposes of Pest Control.
    71→
    72→In particular, for example, the "long-tailed rat" and the "common long-tailed rat" are 2 different species.
    73→
    74→Policies
    75→A policy is advice to the authority to either conserve or cull a particular species at a particular site. Each created policy at a given site is identified by a unique u32 "policy ID". The species is identified by a str.
    76→
    77→Policy IDs are only applicable within a given site. Different sites may use the same policy ID to refer to different policies. Any given site will not reuse a policy ID even after it has been deleted.
    78→
    79→Message types
    80→Each message has a single byte indicating the message type, followed by a u32 containing the message's total length in bytes (including the bytes for the type, length, and checksum), followed by the message content, followed by a single byte checksum.
    81→
    82→Anywhere a message triggers a response, the responses must always come in the same order as the corresponding requests.
    83→
    84→0x50: Hello
    85→Fields:
    86→
    87→protocol: str ("pestcontrol")
    88→version: u32 (1)
    89→This message must be sent by each side as the first message of every session. The values for protocol and version must be "pestcontrol" and 1 respectively. It is an error to send any other values. It is an error for the first message from a client or server to be of a type other than Hello.
    90→
    91→Example:
    92→
    93→Hexadecimal:    Decoded:
    94→50              Hello{
    95→00 00 00 19       (length 25)
    96→00 00 00 0b       protocol: (length 11)
    97→70 65 73 74        "pest
    98→63 6f 6e 74         cont
    99→72 6f 6c            rol"
   100→00 00 00 01       version: 1
   101→ce                (checksum 0xce)
   102→                }
   103→0x51: Error
   104→Fields:
   105→
   106→message: str
   107→When a client or server detects an error condition caused by the other side of the connection, it must send an Error message, and may optionally close the connection.
   108→
   109→Example:
   110→
   111→Hexadecimal:    Decoded:
   112→51              Error{
   113→00 00 00 0d       (length 13)
   114→00 00 00 03       message: (length 3)
   115→62 61 64           "bad",
   116→78                (checksum 0x78)
   117→                }
   118→0x52: OK
   119→No fields.
   120→
   121→This message is sent as an acknowledgment of success in response to valid DeletePolicy messages.
   122→
   123→Example:
   124→
   125→Hexadecimal:    Decoded:
   126→52              OK{
   127→00 00 00 06       (length 6)
   128→a8                (checksum 0xa8)
   129→                }
   130→0x53: DialAuthority
   131→Fields:
   132→
   133→site: u32
   134→This message is sent by your server to the Authority Server, to ask the Authority Server to connect to a particular authority. This must be the second message you send to the Authority Server (after the mandatory Hello). Once connected to the corresponding authority, the Authority Server will send back the desired target population ranges as a TargetPopulations message.
   135→
   136→Once an authority is dialed, the connection to the Authority Server remains connected to that authority until the connection is closed. To dial a different authority you need to make another connection to the Authority Server.
   137→
   138→Example:
   139→
   140→Hexadecimal:    Decoded:
   141→53              DialAuthority{
   142→00 00 00 0a       (length 10)
   143→00 00 30 39       site: 12345,
   144→3a                (checksum 0x3a)
   145→                }
   146→0x54: TargetPopulations
   147→Fields:
   148→
   149→site: u32
   150→populations: [{species: str, min: u32, max: u32}, ...]
   151→This message is sent by the Authority Server in response to a valid DialAuthority message, once it has connected to the authority and obtained the target population ranges.
   152→
   153→The message contains the site number and the minimum and maximum intended value for each controlled species. The Authority Server will never send a TargetPopulations message with a site ID that you didn't ask for.
   154→
   155→Example:
   156→
   157→Hexadecimal:    Decoded:
   158→54              TargetPopulations{
   159→00 00 00 2c       (length 44)
   160→00 00 30 39       site: 12345,
   161→00 00 00 02       populations: (length 2) [
   162→                    {
   163→00 00 00 03           species: (length 3)
   164→64 6f 67                "dog",
   165→00 00 00 01           min: 1,
   166→00 00 00 03           max: 3,
   167→                    },
   168→                    {
   169→00 00 00 03           species: (length 3)
   170→72 61 74                "rat",
   171→00 00 00 00           min: 0,
   172→00 00 00 0a           max: 10,
   173→                    },
   174→                  ],
   175→80                (checksum 0x80)
   176→                }
   177→0x55: CreatePolicy
   178→Fields:
   179→
   180→species: str
   181→action: byte (0x90 = cull, 0xa0 = conserve, anything else is an error)
   182→This message is sent by your server to the Authority Server, to advise the authority to instate a new policy. The species field identifies the species, and the action field says whether the authority should cull the species (value of 0x90), or conserve the species (value of 0xa0).
   183→
   184→The Authority Server will send back a PolicyResult message containing the assigned policy ID.
   185→
   186→Example:
   187→
   188→Hexadecimal:    Decoded:
   189→55              CreatePolicy{
   190→00 00 00 0e       (length 14)
   191→00 00 00 03       species: (length 3)
   192→64 6f 67            "dog",
   193→a0                action: conserve,
   194→c0                (checksum 0xc0)
   195→                }
   196→0x56: DeletePolicy
   197→Fields:
   198→
   199→policy: u32
   200→This message is sent by your server to the Authority Server, to advise the authority to delete an existing policy. The policy field must refer to a policy ID previously returned in a PolicyResult message for the site. It is an error to attempt to delete a non-existent policy.
   201→
   202→The Authority Server will sent back an OK message to acknowledge deletion of the policy.
   203→
   204→Example:
   205→
   206→Hexadecimal:    Decoded:
   207→56              DeletePolicy{
   208→00 00 00 0a       (length 10)
   209→00 00 00 7b       policy: 123,
   210→25                (checksum 0x25)
   211→                }
   212→0x57: PolicyResult
   213→Fields:
   214→
   215→policy: u32
   216→This message is sent by the Authority Server to your server in response to a valid CreatePolicy message. It tells you the policy ID that was assigned.
   217→
   218→Example:
   219→
   220→Hexadecimal:    Decoded:
   221→57              PolicyResult{
   222→00 00 00 0a       (length 10)
   223→00 00 00 7b       policy: 123,
   224→24                (checksum 0x24)
   225→                }
   226→0x58: SiteVisit
   227→Fields:
   228→
   229→site: u32
   230→populations: [{species: str, count: u32}, ...]
   231→This message is sent by a client to your server, to inform it of the latest observations from a site visit. The site field identifies the site, and the populations field is an array containing the observed number of each observed species.
   232→
   233→It is an error for the populations field to contain multiple conflicting counts for the same species (but non-conflicting duplicates are allowed).
   234→
   235→Your server must not send any response to valid SiteVisit messages.
   236→
   237→Example:
   238→
   239→Hexadecimal:    Decoded:
   240→58              SiteVisit{
   241→00 00 00 24       (length 36)
   242→00 00 30 39       site: 12345,
   243→00 00 00 02       populations: (length 2) [
   244→                    {
   245→00 00 00 03           species: (length 3)
   246→64 6f 67                "dog",
   247→00 00 00 01           count: 1,
   248→                    },
   249→                    {
   250→00 00 00 03           species: (length 3)
   251→72 61 74                "rat",
   252→00 00 00 05            count: 5,
   253→                    },
   254→                  ],
   255→8c                (checksum 0x8c)
   256→                }
   257→Message lengths
   258→It is an error for the content contained within the message to exceed the bounds of the message's specified length.
   259→
   260→It is an error for the content contained within the message to be shorter than implied by the message's specified length (i.e. if there are unused bytes in the message).
   261→
   262→The following message is illegal because it has 4 unused bytes between the message content and the checksum:
   263→
   264→Hexadecimal:    Decoded:
   265→50              Hello{
   266→00 00 00 1d       (length 29)
   267→00 00 00 0b       protocol: (length 11)
   268→70 65 73 74        "pest
   269→63 6f 6e 74         cont
   270→72 6f 6c            rol"
   271→00 00 00 01       version: 1
   272→00 00 00 00
   273→ca                (checksum 0xca)
   274→                }
   275→The following message is illegal because it declares a total length of 10 bytes, but contains more than 10 bytes in total (in particular, the string is declared to be 11 bytes long):
   276→
   277→Hexadecimal:    Decoded:
   278→50              Hello{
   279→00 00 00 0a       (length 10)
   280→00 00 00 0b       protocol: (length 11)
   281→70 65 73 74        "pest
   282→63 6f 6e 74         cont
   283→72 6f 6c            rol"
   284→00 00 00 01       version: 1
   285→ca                (checksum 0xca)
   286→                }
   287→Policy rules
   288→When a client sends you a SiteVisit, you need a connection to the authority for the specified site. If you don't already have one, connect to the Authority Server and use DialAuthority to connect to the correct authority. This will send you back the TargetPopulations for that site. If you already have a connection to the site authority, you may reuse the same connection.
   289→
   290→Looking at the TargetPopulations, work out whether the count c for each species was within range (min <= c <= max), too low (c < min), or too high (c > max). Where a species is not present in the SiteVisit, it means there were no animals of that species observed. Where a species is observed in the SiteVisit but not present in the TargetPopulations, it means the authority is not trying to control the population of that species, so you should not advise any policy.
   291→
   292→(The site visitors are very thorough, so you don't need to worry that there might have been some animals hiding that they failed to count: you can trust that the counts reported in the SiteVisit messages are the true population counts.)
   293→
   294→The TargetPopulations for any given site are static; it is safe to cache them indefinitely.
   295→
   296→You need to make sure that there is no policy advised for those species which are within the intended range, that there is a conserve policy for those species which have too few members, and a cull policy for those species which have too many members.
   297→
   298→Advise the correct policies by sending CreatePolicy and DeletePolicy messages to the site authority, via your connection through the Authority Server. You need to keep track of which policies are advised (identified by policy IDs sent in the PolicyResult messages) so that you can adjust them next time you get observations from the same site.
   299→
   300→It is acceptable for the policies to be in an incorrect state transiently, while you are still actively creating and deleting policies, but they must settle to the correct state, corresponding to the most recent site visit. The settled state may not contain more than one policy for any given species, even if they are duplicates.
   301→
   302→Example session with site-visiting client
   303→"-->" denotes messages from the server to the client, and "<--" denotes messages from the client to the server.
   304→
   305→Here, a client connects to your server:
   306→
   307→<-- Hello
   308→--> Hello
   309→<-- SiteVisit{site:12345, populations:[{species:"long-tailed rat",count:20}]}
   310→Both sides say Hello, and then the client reports a site visit for site ID 12345, with an observation of 20 long-tailed rats.
   311→
   312→Example session with Authority Server
   313→Here, your server is the client, connecting to the Authority Server:
   314→
   315→<-- Hello
   316→--> Hello
   317→<-- DialAuthority{site:12345}
   318→--> TargetPopulations{site:12345, populations:[{species:"long-tailed rat",min:0,max:10}]}
   319→<-- CreatePolicy{species:"long-tailed rat", action:"cull"}
   320→--> PolicyResult{policy:123}
   321→Both sides say Hello, and then the client requests to dial the authority for side ID 12345. The authority specifies that there should be between 0 and 10 long-tailed rats. 20 long-tailed rats had been observed, so the client advises the creation of a policy to cull long-tailed rats, and the authority assigns policy ID 123.
   322→
   323→Other requirements
   324→Accept connections over TCP.
   325→
   326→The protocol does not specify bounds on lengths, number of simultaneous clients, etc.; there are no hard limits imposed by the specification, but your server needs to work. It is acceptable to quickly return an Error for a rogue client that attempts to submit a message with a length field which is "unreasonably large", without first buffering the entire message, as long as your server works for legitimate clients.
   327→
   328→One client can submit site visits for multiple sites, and multiple clients can submit site visits for the same site. Where multiple clients submit site visits for the same site around the same time, and their order is ambiguous, your server may decide on any possible ordering that is consistent with all externally-observable behaviour.
   329→

<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 file /home/smite/dev/protohackers/11-pest-control/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→import asyncio
     3→import os
     4→import struct
     5→import sys
     6→from typing import Dict, List, Optional, Tuple, Set
     7→from dataclasses import dataclass
     8→import logging
     9→
    10→DEBUG = False
    11→if 'DEBUG' in os.environ or len(sys.argv) > 1 and sys.argv[1] == '--debug':
    12→    logging.basicConfig(level=logging.DEBUG)

{"success":true,"message":"Successfully killed shell: bash_1 (cd /home/smite/dev/protohackers/11-pest-control && python3 server.py --debug)","shell_id":"bash_1"}

The file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
     6→from typing import Dict, List, Optional, Tuple, Set
     7→from dataclasses import dataclass
     8→import logging
     9→
    10→DEBUG = False
    11→if 'DEBUG' in os.environ or (len(sys.argv) > 1 and '--debug' in sys.argv):
    12→    logging.basicConfig(level=logging.DEBUG)
    13→    DEBUG = True
    14→
    15→@dataclass
    16→class TargetPopulation:
    17→    species: str

The file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   375→        msg_type, length, response_content = await self.read_message(reader)
   376→        if msg_type != 0x52:
   377→            raise ProtocolError(f"Expected OK, got {msg_type:02x}")
   378→
   379→async def main():
   380→    port = 8080
   381→    for arg in sys.argv[1:]:
   382→        if arg == '--debug':
   383→            continue
   384→        try:
   385→            port = int(arg)
   386→        except ValueError:
   387→            print(f"Usage: {sys.argv[0]} [port] [--debug]")
   388→            sys.exit(1)
   389→    
   390→    server = PestControlServer(port)
   391→    await server.start()
   392→
   393→if __name__ == '__main__':
   394→    asyncio.run(main())

{"success":true,"message":"Successfully killed shell: bash_2 (cd /home/smite/dev/protohackers/11-pest-control && python3 server.py --debug)","shell_id":"bash_2"}

Connected to server
Sending Hello...
Received Hello response
Sending SiteVisit for site 12345 with populations: [('dog', 5), ('cat', 2), ('rat', 15)]
SiteVisit sent - no response expected per protocol

The file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    78→        self.authority_connections: Dict[int, Tuple[asyncio.StreamReader, asyncio.StreamWriter]] = {}
    79→        self.site_targets: Dict[int, List[TargetPopulation]] = {}
    80→        self.site_policies: Dict[int, Dict[str, Policy]] = {}  # site -> species -> policy
    81→        
    82→    async def start(self):
    83→        server = await asyncio.start_server(
    84→            self.handle_client, '0.0.0.0', self.port
    85→        )
    86→        print(f"Pest Control Server listening on port {self.port}")
    87→        async with server:
    88→            await server.serve_forever()
    89→    
    90→    async def handle_client(self, reader: asyncio.StreamReader, writer: asyncio.StreamWriter):
    91→        try:
    92→            # First message must be Hello

{"success":true,"message":"Successfully killed shell: bash_3 (cd /home/smite/dev/protohackers/11-pest-control && python3 server.py --debug)","shell_id":"bash_3"}

The file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   374→        msg_type, length, response_content = await self.read_message(reader)
   375→        if msg_type != 0x52:
   376→            raise ProtocolError(f"Expected OK, got {msg_type:02x}")
   377→
   378→async def main():
   379→    port = 8080
   380→    for arg in sys.argv[1:]:
   381→        if arg == '--debug':
   382→            continue
   383→        try:
   384→            port = int(arg)
   385→        except ValueError:
   386→            print(f"Usage: {sys.argv[0]} [port] [--debug]")
   387→            sys.exit(1)
   388→    
   389→    print(f"Starting server on port {port}, DEBUG={DEBUG}")
   390→    server = PestControlServer(port)
   391→    await server.start()
   392→
   393→if __name__ == '__main__':
   394→    asyncio.run(main())

Connected to server
Sending Hello...
Received Hello response
Sending SiteVisit for site 12345 with populations: [('dog', 5), ('cat', 2), ('rat', 15)]
SiteVisit sent - no response expected per protocol

Connected to server
Sending Hello...
Received Hello response
Sending first SiteVisit for site 12345 with populations: [('dog', 5), ('rat', 15)]
Sending second SiteVisit for site 12345 with populations: [('dog', 2), ('rat', 8), ('cat', 3)]
Test completed - check server logs for authority interactions
DEBUG:asyncio:Using selector: EpollSelector

The file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   186→        
   187→        content = content_and_checksum[:-1]  # Exclude checksum byte
   188→        return msg_type, length, content
   189→    
   190→    async def handle_site_visit(self, content: bytes, client_writer: asyncio.StreamWriter):
   191→        offset = 0
   192→        site_id, offset = MessageParser.unpack_u32(content, offset)
   193→        
   194→        # Parse populations array
   195→        array_length, offset = MessageParser.unpack_u32(content, offset)
   196→        populations = []
   197→        species_seen = set()
   198→        
   199→        for i in range(array_length):
   200→            species, offset = MessageParser.unpack_str(content, offset)
   201→            count, offset = MessageParser.unpack_u32(content, offset)
   202→            
   203→            # Check for conflicting duplicates
   204→            if species in species_seen:
   205→                # Find existing entry
   206→                for pop in populations:
   207→                    if pop.species == species and pop.count != count:
   208→                        await self.send_error(client_writer, f"Conflicting counts for species {species}")
   209→                        return
   210→            
   211→            species_seen.add(species)
   212→            populations.append(ObservedPopulation(species, count))
   213→        
   214→        print(f"[LOG] Site visit for site {site_id}: {[(p.species, p.count) for p in populations]}")
   215→        
   216→        # Get or establish authority connection
   217→        try:
   218→            await self.ensure_authority_connection(site_id)
   219→            await self.update_policies(site_id, populations)
   220→        except Exception as e:
   221→            print(f"[LOG] Error handling site visit: {e}")
   222→            import traceback
   223→            traceback.print_exc()
   224→            # Don't send error to client for site visits - spec says no response for valid messages
   225→    
   226→    async def ensure_authority_connection(self, site_id: int):
   227→        if site_id not in self.authority_connections:
   228→            # Connect to Authority Server

Connected to server
Sending Hello...
Received Hello response
Sending SiteVisit for site 12345 with populations: [('dog', 5), ('cat', 2), ('rat', 15)]
SiteVisit sent - no response expected per protocol
Traceback (most recent call last):
  File "/home/smite/dev/protohackers/11-pest-control/server.py", line 218, in handle_site_visit
    await self.ensure_authority_connection(site_id)
  File "/home/smite/dev/protohackers/11-pest-control/server.py", line 250, in ensure_authority_connection
    raise ProtocolError(f"Expected TargetPopulations, got {msg_type:02x}")
ProtocolError: Expected TargetPopulations, got 51

The file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   243→                message = MessageParser.pack_message(0x53, content)
   244→                writer.write(message)
   245→                await writer.drain()
   246→                
   247→                # Read TargetPopulations response
   248→                msg_type, length, content = await self.read_message(reader)
   249→                if msg_type == 0x51:  # Error message
   250→                    error_msg, _ = MessageParser.unpack_str(content, 0)
   251→                    raise ProtocolError(f"Authority server error: {error_msg}")
   252→                elif msg_type != 0x54:
   253→                    raise ProtocolError(f"Expected TargetPopulations, got {msg_type:02x}")
   254→                
   255→                # Parse TargetPopulations
   256→                offset = 0
   257→                returned_site_id, offset = MessageParser.unpack_u32(content, offset)

Connected to server
Sending Hello...
Received Hello response
Sending SiteVisit for site 12345 with populations: [('dog', 5), ('cat', 2), ('rat', 15)]
SiteVisit sent - no response expected per protocol
Traceback (most recent call last):
  File "/home/smite/dev/protohackers/11-pest-control/server.py", line 218, in handle_site_visit
    await self.ensure_authority_connection(site_id)
  File "/home/smite/dev/protohackers/11-pest-control/server.py", line 251, in ensure_authority_connection
    raise ProtocolError(f"Authority server error: {error_msg}")
ProtocolError: Authority server error: No such site: 12345

Connected to authority server
Hello response: 50

Trying site 1...
Site 1 error: No such site: 1

Trying site 2...
Test failed: unsupported format string passed to NoneType.__format__
Traceback (most recent call last):
  File "/home/smite/dev/protohackers/11-pest-control/test_authority.py", line 88, in test_authority_sites
    print(f"Unexpected response: {msg_type:02x}")
                                 ^^^^^^^^^^^^^^
TypeError: unsupported format string passed to NoneType.__format__

The file /home/smite/dev/protohackers/11-pest-control/test_authority.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    40→        return None, None, None
    41→    
    42→    return msg_type, length, content_and_checksum[:-1]
    43→
    44→def test_site(site_id):
    45→    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    46→    try:
    47→        sock.connect(('pestcontrol.protohackers.com', 20547))
    48→        
    49→        # Send Hello
    50→        hello_content = pack_str("pestcontrol") + pack_u32(1)
    51→        hello_msg = pack_message(0x50, hello_content)
    52→        sock.send(hello_msg)
    53→        
    54→        # Read Hello response
    55→        msg_type, length, content = read_message(sock)
    56→        
    57→        # Send DialAuthority
    58→        dial_content = pack_u32(site_id)
    59→        dial_msg = pack_message(0x53, dial_content)
    60→        sock.send(dial_msg)
    61→        
    62→        # Read response
    63→        msg_type, length, content = read_message(sock)
    64→        if msg_type == 0x54:  # TargetPopulations
    65→            print(f"Site {site_id} exists!")
    66→            # Parse response
    67→            offset = 0
    68→            returned_site, offset = unpack_u32(content, offset)
    69→            array_len, offset = unpack_u32(content, offset)
    70→            print(f"  Site: {returned_site}, Species count: {array_len}")
    71→            
    72→            for i in range(array_len):
    73→                species, offset = unpack_str(content, offset)
    74→                min_val, offset = unpack_u32(content, offset)
    75→                max_val, offset = unpack_u32(content, offset)
    76→                print(f"  {species}: {min_val}-{max_val}")
    77→            return True
    78→        elif msg_type == 0x51:  # Error
    79→            error_msg, _ = unpack_str(content, 0)
    80→            print(f"Site {site_id} error: {error_msg}")
    81→            return False
    82→        else:
    83→            print(f"Site {site_id} unexpected response: {msg_type:02x}")
    84→            return False
    85→        
    86→    except Exception as e:
    87→        print(f"Site {site_id} failed: {e}")
    88→        return False
    89→    finally:
    90→        sock.close()
    91→
    92→def test_authority_sites():
    93→    print("Testing authority server sites...")
    94→    # Try different site IDs
    95→    for site_id in [1, 2, 3, 100, 1000, 10000]:
    96→        if test_site(site_id):
    97→            break
    98→
    99→if __name__ == '__main__':
   100→    test_authority_sites()

Testing authority server sites...
Site 1 error: No such site: 1
Site 2 error: No such site: 2
Site 3 error: No such site: 3
Site 100 error: No such site: 100
Site 1000 error: No such site: 1000
Site 10000 error: No such site: 10000

The file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    72→    def verify_checksum(data: bytes) -> bool:
    73→        return sum(data) % 256 == 0
    74→
    75→class PestControlServer:
    76→    def __init__(self, port: int = 8080):
    77→        self.port = port
    78→        self.authority_connections: Dict[int, Tuple[asyncio.StreamReader, asyncio.StreamWriter]] = {}
    79→        self.site_targets: Dict[int, List[TargetPopulation]] = {}
    80→        self.site_policies: Dict[int, Dict[str, Policy]] = {}  # site -> species -> policy
    81→        self.site_locks: Dict[int, asyncio.Lock] = {}  # Per-site locks for authority communication
    82→        
    83→    async def start(self):
    84→        server = await asyncio.start_server(
    85→            self.handle_client, '0.0.0.0', self.port

The file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   213→            populations.append(ObservedPopulation(species, count))
   214→        
   215→        print(f"[LOG] Site visit for site {site_id}: {[(p.species, p.count) for p in populations]}")
   216→        
   217→        # Get or establish authority connection
   218→        try:
   219→            # Ensure we have a lock for this site
   220→            if site_id not in self.site_locks:
   221→                self.site_locks[site_id] = asyncio.Lock()
   222→            
   223→            # Use per-site lock to serialize authority communication
   224→            async with self.site_locks[site_id]:
   225→                await self.ensure_authority_connection(site_id)
   226→                await self.update_policies(site_id, populations)
   227→        except Exception as e:
   228→            print(f"[LOG] Error handling site visit: {e}")
   229→            import traceback
   230→            traceback.print_exc()
   231→            # Don't send error to client for site visits - spec says no response for valid messages
   232→    
   233→    async def ensure_authority_connection(self, site_id: int):
   234→        if site_id not in self.authority_connections:
   235→            # Connect to Authority Server

The file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   341→                        print(f"Created policy {policy_id} to {action_str} {species} (count: {observed_count})")
   342→        
   343→        self.site_policies[site_id] = new_policies
   344→    
   345→    async def create_policy(self, site_id: int, species: str, action: int) -> int:
   346→        if site_id not in self.authority_connections:
   347→            raise ProtocolError(f"No authority connection for site {site_id}")
   348→        
   349→        reader, writer = self.authority_connections[site_id]
   350→        
   351→        content = MessageParser.pack_str(species) + struct.pack('>B', action)
   352→        message = MessageParser.pack_message(0x55, content)
   353→        writer.write(message)
   354→        await writer.drain()
   355→        
   356→        # Read PolicyResult response
   357→        msg_type, length, response_content = await self.read_message(reader)
   358→        if msg_type != 0x57:
   359→            raise ProtocolError(f"Expected PolicyResult, got {msg_type:02x}")
   360→        
   361→        policy_id, _ = MessageParser.unpack_u32(response_content, 0)
   362→        return policy_id
   363→    
   364→    async def delete_policy(self, site_id: int, policy_id: int):
   365→        if site_id not in self.authority_connections:
   366→            raise ProtocolError(f"No authority connection for site {site_id}")
   367→        
   368→        reader, writer = self.authority_connections[site_id]
   369→        
   370→        content = MessageParser.pack_u32(policy_id)
   371→        message = MessageParser.pack_message(0x56, content)
   372→        writer.write(message)
   373→        await writer.drain()
   374→        
   375→        # Read OK response
   376→        msg_type, length, response_content = await self.read_message(reader)
   377→        if msg_type != 0x52:
   378→            raise ProtocolError(f"Expected OK, got {msg_type:02x}")
   379→
   380→async def main():
   381→    port = 8080
   382→    for arg in sys.argv[1:]:

<tool_use_error>String to replace not found in file.
String:                     # Delete existing policy
                    if current_policy:
                        await self.delete_policy(writer, current_policy.policy_id)
                        if DEBUG:
                            print(f"Deleted policy {current_policy.policy_id} for {species} (now within range)")</tool_use_error>

   315→            current_policy = current_policies.get(species)
   316→            
   317→            if required_action is None:
   318→                # No policy needed
   319→                if current_policy:
   320→                    # Delete existing policy
   321→                    await self.delete_policy(writer, current_policy.policy_id)
   322→                    if DEBUG:
   323→                        print(f"Deleted policy {current_policy.policy_id} for {species} (now within range)")
   324→            else:
   325→                # Policy needed
   326→                if current_policy and current_policy.action == required_action:
   327→                    # Keep existing policy
   328→                    new_policies[species] = current_policy
   329→                else:
   330→                    # Delete old policy if exists
   331→                    if current_policy:
   332→                        await self.delete_policy(writer, current_policy.policy_id)
   333→                        if DEBUG:
   334→                            print(f"Deleted old policy {current_policy.policy_id} for {species}")
   335→                    
   336→                    # Create new policy
   337→                    policy_id = await self.create_policy(writer, species, required_action)
   338→                    new_policies[species] = Policy(policy_id, species, required_action)
   339→                    if DEBUG:

<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>

<tool_use_error>Found 2 matches of the string to replace, but replace_all is false. To replace all occurrences, set replace_all to true. To replace only one occurrence, please provide more context to uniquely identify the instance.
String:                     await self.delete_policy(writer, current_policy.policy_id)</tool_use_error>

Applied 2 edits to /home/smite/dev/protohackers/11-pest-control/server.py:
1. Replaced "await self.delete_policy(writer, current_policy.po..." with "await self.delete_policy(site_id, current_policy.p..."
2. Replaced "policy_id = await self.create_policy(writer, speci..." with "policy_id = await self.create_policy(site_id, spec..."

   280→                if DEBUG:
   281→                    print(f"Connected to authority for site {site_id}, targets: {[(t.species, t.min_count, t.max_count) for t in targets]}")
   282→                
   283→            except Exception as e:
   284→                if DEBUG:
   285→                    print(f"Failed to connect to authority for site {site_id}: {e}")
   286→                raise
   287→    
   288→    async def update_policies(self, site_id: int, populations: List[ObservedPopulation]):
   289→        if site_id not in self.authority_connections:

<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 file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   284→                if DEBUG:
   285→                    print(f"Failed to connect to authority for site {site_id}: {e}")
   286→                raise
   287→    
   288→    async def update_policies(self, site_id: int, populations: List[ObservedPopulation]):
   289→        if site_id not in self.authority_connections:
   290→            return
   291→        targets = self.site_targets[site_id]
   292→        current_policies = self.site_policies[site_id]
   293→        
   294→        # Build species -> count mapping from observations

The file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   285→                    print(f"Failed to connect to authority for site {site_id}: {e}")
   286→                raise
   287→    
   288→    async def update_policies(self, site_id: int, populations: List[ObservedPopulation]):
   289→        if site_id not in self.authority_connections:
   290→            return
   291→        
   292→        targets = self.site_targets[site_id]
   293→        current_policies = self.site_policies[site_id]
   294→        
   295→        # Build species -> count mapping from observations
   296→        observed_counts = {pop.species: pop.count for pop in populations}
   297→        

Traceback (most recent call last):
  File "/home/smite/dev/protohackers/11-pest-control/server.py", line 395, in <module>
    asyncio.run(main())
    ~~~~~~~~~~~^^^^^^^^
  File "/usr/lib/python3.13/asyncio/runners.py", line 195, in run
    return runner.run(main)
           ~~~~~~~~~~^^^^^^
  File "/usr/lib/python3.13/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/usr/lib/python3.13/asyncio/base_events.py", line 719, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/home/smite/dev/protohackers/11-pest-control/server.py", line 392, in main
    await server.start()
  File "/home/smite/dev/protohackers/11-pest-control/server.py", line 84, in start
    server = await asyncio.start_server(
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
        self.handle_client, '0.0.0.0', self.port
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/lib/python3.13/asyncio/streams.py", line 84, in start_server
    return await loop.create_server(factory, host, port, **kwds)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/asyncio/base_events.py", line 1616, in create_server
    raise OSError(err.errno, msg) from None
OSError: [Errno 98] error while attempting to bind on address ('0.0.0.0', 8080): [errno 98] address already in use
/bin/bash: line 1: kill: (270269) - No such process

Starting server on port 8080, DEBUG=False
Connected to server
Sending Hello: 50000000190000000b70657374636f6e74726f6c00000001ce
Received response: 50000000190000000b70657374636f6e74726f6c00000001ce
Received Hello response - SUCCESS!

The file /home/smite/dev/protohackers/11-pest-control/test_basic.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    21→
    22→def test_hello():
    23→    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    24→    try:
    25→        sock.connect(('localhost', 8081))
    26→        print("Connected to server")
    27→        
    28→        # Send Hello message
    29→        content = pack_str("pestcontrol") + pack_u32(1)

Testing concurrent site visits for the same site...
Client 2: Connected to server
Client 4: Connected to server
Client 1: Connected to server
Client 3: Connected to server
Client 2: Sending SiteVisit for site 12345 with populations: [('dog', 3), ('rat', 10)]
Client 1: Sending SiteVisit for site 12345 with populations: [('dog', 5), ('cat', 2)]
Client 4: Sending SiteVisit for site 12345 with populations: [('dog', 1), ('cat', 3), ('rat', 12)]
Client 3: Sending SiteVisit for site 12345 with populations: [('cat', 4), ('rat', 8)]
Client 2: SiteVisit sent
Client 4: SiteVisit sent
Client 3: SiteVisit sent
Client 1: SiteVisit sent
All concurrent requests completed in 1.00 seconds
Traceback (most recent call last):
  File "/home/smite/dev/protohackers/11-pest-control/server.py", line 225, in handle_site_visit
    await self.ensure_authority_connection(site_id)
  File "/home/smite/dev/protohackers/11-pest-control/server.py", line 258, in ensure_authority_connection
    raise ProtocolError(f"Authority server error: {error_msg}")
ProtocolError: Authority server error: No such site: 12345
Traceback (most recent call last):
  File "/home/smite/dev/protohackers/11-pest-control/server.py", line 225, in handle_site_visit
    await self.ensure_authority_connection(site_id)
  File "/home/smite/dev/protohackers/11-pest-control/server.py", line 258, in ensure_authority_connection
    raise ProtocolError(f"Authority server error: {error_msg}")
ProtocolError: Authority server error: No such site: 12345
Traceback (most recent call last):
  File "/home/smite/dev/protohackers/11-pest-control/server.py", line 225, in handle_site_visit
    await self.ensure_authority_connection(site_id)
  File "/home/smite/dev/protohackers/11-pest-control/server.py", line 258, in ensure_authority_connection
    raise ProtocolError(f"Authority server error: {error_msg}")
ProtocolError: Authority server error: No such site: 12345
Traceback (most recent call last):
  File "/home/smite/dev/protohackers/11-pest-control/server.py", line 225, in handle_site_visit
    await self.ensure_authority_connection(site_id)
  File "/home/smite/dev/protohackers/11-pest-control/server.py", line 258, in ensure_authority_connection
    raise ProtocolError(f"Authority server error: {error_msg}")
ProtocolError: Authority server error: No such site: 12345

The file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   157→        message = MessageParser.pack_message(0x52, b'')
   158→        writer.write(message)
   159→        await writer.drain()
   160→    
   161→    async def read_message(self, reader: asyncio.StreamReader) -> Tuple[Optional[int], Optional[int], Optional[bytes]]:
   162→        # Read message type
   163→        type_data = await reader.readexactly(1)
   164→        if not type_data:
   165→            return None, None, None
   166→        msg_type = type_data[0]
   167→        
   168→        # Read length
   169→        length_data = await reader.readexactly(4)
   170→        length = struct.unpack('>I', length_data)[0]
   171→        
   172→        if length < 6 or length > 10000000:  # Reasonable bounds check - increased for long messages
   173→            raise ProtocolError(f"Invalid message length: {length}")
   174→        
   175→        # Read remaining content (length - 5 bytes for type and length field)
   176→        remaining = length - 5
   177→        content_and_checksum = await reader.readexactly(remaining)
   178→        
   179→        # Verify checksum
   180→        full_message = type_data + length_data + content_and_checksum
   181→        if not MessageParser.verify_checksum(full_message):
   182→            raise ProtocolError("Invalid checksum")
   183→        
   184→        content = content_and_checksum[:-1]  # Exclude checksum byte
   185→        return msg_type, length, content
   186→    
   187→    async def handle_site_visit(self, content: bytes, client_writer: asyncio.StreamWriter):
   188→        offset = 0
   189→        site_id, offset = MessageParser.unpack_u32(content, offset)

The file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   157→        message = MessageParser.pack_message(0x52, b'')
   158→        writer.write(message)
   159→        await writer.drain()
   160→    
   161→    async def read_message(self, reader: asyncio.StreamReader) -> Tuple[Optional[int], Optional[int], Optional[bytes]]:
   162→        try:
   163→            # Read message type
   164→            type_data = await reader.readexactly(1)
   165→            msg_type = type_data[0]
   166→            
   167→            # Read length
   168→            length_data = await reader.readexactly(4)
   169→            length = struct.unpack('>I', length_data)[0]
   170→            
   171→            if length < 6 or length > 10000000:  # Reasonable bounds check - increased for long messages
   172→                raise ProtocolError(f"Invalid message length: {length}")
   173→            
   174→            # Read remaining content (length - 5 bytes for type and length field)
   175→            remaining = length - 5
   176→            content_and_checksum = await reader.readexactly(remaining)
   177→            
   178→            # Verify checksum
   179→            full_message = type_data + length_data + content_and_checksum
   180→            if not MessageParser.verify_checksum(full_message):
   181→                raise ProtocolError("Invalid checksum")
   182→            
   183→            content = content_and_checksum[:-1]  # Exclude checksum byte
   184→            return msg_type, length, content
   185→        except asyncio.IncompleteReadError:
   186→            return None, None, None
   187→    
   188→    async def handle_site_visit(self, content: bytes, client_writer: asyncio.StreamWriter):
   189→        offset = 0
   190→        site_id, offset = MessageParser.unpack_u32(content, offset)

Starting server on port 8081, DEBUG=False
Pest Control Server listening on port 8081
[LOG] Site visit for site 12345: [('very_long_species_name_number_0000_with_lots_of_extra_characters_to_make_it_really_long', 0), ('very_long_species_name_number_0001_with_lots_of_extra_characters_to_make_it_really_long', 1), ('very_long_species_name_number_0002_with_lots_of_extra_characters_to_make_it_really_long', 2), ('very_long_species_name_number_0003_with_lots_of_extra_characters_to_make_it_really_long', 3), ('very_long_species_name_number_0004_with_lots_of_extra_characters_to_make_it_really_long', 4), ('very_long_species_name_number_0005_with_lots_of_extra_characters_to_make_it_really_long', 5), ('very_long_species_name_number_0006_with_lots_of_extra_characters_to_make_it_really_long', 6), ('very_long_species_name_number_0007_with_lots_of_extra_characters_to_make_it_really_long', 7), ('very_long_species_name_number_0008_with_lots_of_extra_characters_to_make_it_really_long', 8), ('very_long_species_name_number_0009_with_lots_of_extra_characters_to_make_it_really_long', 9), ('very_long_species_name_number_0010_with_lots_of_extra_characters_to_make_it_really_long', 10), ('very_long_species_name_number_0011_with_lots_of_extra_characters_to_make_it_really_long', 11), ('very_long_species_name_number_0012_with_lots_of_extra_characters_to_make_it_really_long', 12), ('very_long_species_name_number_0013_with_lots_of_extra_characters_to_make_it_really_long', 13), ('very_long_species_name_number_0014_with_lots_of_extra_characters_to_make_it_really_long', 14), ('very_long_species_name_number_0015_with_lots_of_extra_characters_to_make_it_really_long', 15), ('very_long_species_name_number_0016_with_lots_of_extra_characters_to_make_it_really_long', 16), ('very_long_species_name_number_0017_with_lots_of_extra_characters_to_make_it_really_long', 17), ('very_long_species_name_number_0018_with_lots_of_extra_characters_to_make_it_really_long', 18), ('very_long_species_name_number_0019_with_lots_of_extra_characters_to_make_it_really_long', 19), ('very_long_species_name_number_0020_with_lots_of_extra_characters_to_make_it_really_long', 20), ('very_long_species_name_number_0021_with_lots_of_extra_characters_to_make_it_really_long', 21), ('very_long_species_name_number_0022_with_lots_of_extra_characters_to_make_it_really_long', 22), ('very_long_species_name_number_0023_with_lots_of_extra_characters_to_make_it_really_long', 23), ('very_long_species_name_number_0024_with_lots_of_extra_characters_to_make_it_really_long', 24), ('very_long_species_name_number_0025_with_lots_of_extra_characters_to_make_it_really_long', 25), ('very_long_species_name_number_0026_with_lots_of_extra_characters_to_make_it_really_long', 26), ('very_long_species_name_number_0027_with_lots_of_extra_characters_to_make_it_really_long', 27), ('very_long_species_name_number_0028_with_lots_of_extra_characters_to_make_it_really_long', 28), ('very_long_species_name_number_0029_with_lots_of_extra_characters_to_make_it_really_long', 29), 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('very_long_species_name_number_0220_with_lots_of_extra_characters_to_make_it_really_long', 20), ('very_long_species_name_number_0221_with_lots_of_extra_characters_to_make_it_really_long', 21), ('very_long_species_name_number_0222_with_lots_of_extra_characters_to_make_it_really_long', 22), ('very_long_species_name_number_0223_with_lots_of_extra_characters_to_make_it_really_long', 23), ('very_long_species_name_number_0224_with_lots_of_extra_characters_to_make_it_really_long', 24), ('very_long_species_name_number_0225_with_lots_of_extra_characters_to_make_it_really_long', 25), ('very_long_species_name_number_0226_with_lots_of_extra_characters_to_make_it_really_long', 26), ('very_long_species_name_number_0227_with_lots_of_extra_characters_to_make_it_really_long', 27), ('very_long_species_name_number_0228_with_lots_of_extra_characters_to_make_it_really_long', 28), ('very_long_species_name_number_0229_with_lots_of_extra_characters_to_make_it_really_long', 29), ('very_long_species_name_number_0230_with_lots_of_extra_characters_to_make_it_really_long', 30), ('very_long_species_name_number_0231_with_lots_of_extra_characters_to_make_it_really_long', 31), ('very_long_species_name_number_0232_with_lots_of_extra_characters_to_make_it_really_long', 32), ('very_long_species_name_number_0233_with_lots_of_extra_characters_to_make_it_really_long', 33), ('very_long_species_name_number_0234_with_lots_of_extra_characters_to_make_it_really_long', 34), ('very_long_species_name_number_0235_with_lots_of_extra_characters_to_make_it_really_long', 35), ('very_long_species_name_number_0236_with_lots_of_extra_characters_to_make_it_really_long', 36), ('very_long_species_name_number_0237_with_lots_of_extra_characters_to_make_it_really_long', 37), ('very_long_species_name_number_0238_with_lots_of_extra_characters_to_make_it_really_long', 38), ('very_long_species_name_number_0239_with_lots_of_extra_characters_to_make_it_really_long', 39), ('very_long_species_name_number_0240_with_lots_of_extra_characters_to_make_it_really_long', 40), ('very_long_species_name_number_0241_with_lots_of_extra_characters_to_make_it_really_long', 41), ('very_long_species_name_number_0242_with_lots_of_extra_characters_to_make_it_really_long', 42), ('very_long_species_name_number_0243_with_lots_of_extra_characters_to_make_it_really_long', 43), ('very_long_species_name_number_0244_with_lots_of_extra_characters_to_make_it_really_long', 44), ('very_long_species_name_number_0245_with_lots_of_extra_characters_to_make_it_really_long', 45), ('very_long_species_name_number_0246_with_lots_of_extra_characters_to_make_it_really_long', 46), ('very_long_species_name_number_0247_with_lots_of_extra_characters_to_make_it_really_long', 47), ('very_long_species_name_number_0248_with_lots_of_extra_characters_to_make_it_really_long', 48), ('very_long_species_name_number_0249_with_lots_of_extra_characters_to_make_it_really_long', 49), ('very_long_species_name_number_0250_with_lots_of_extra_characters_to_make_it_really_long', 50), ('very_long_species_name_number_0251_with_lots_of_extra_characters_to_make_it_really_long', 51), ('very_long_species_name_number_0252_with_lots_of_extra_characters_to_make_it_really_long', 52), ('very_long_species_name_number_0253_with_lots_of_extra_characters_to_make_it_really_long', 53), ('very_long_species_name_number_0254_with_lots_of_extra_characters_to_make_it_really_long', 54), ('very_long_species_name_number_0255_with_lots_of_extra_characters_to_make_it_really_long', 55), ('very_long_species_name_number_0256_with_lots_of_extra_characters_to_make_it_really_long', 56), ('very_long_species_name_number_0257_with_lots_of_extra_characters_to_make_it_really_long', 57), ('very_long_species_name_number_0258_with_lots_of_extra_characters_to_make_it_really_long', 58), ('very_long_species_name_number_0259_with_lots_of_extra_characters_to_make_it_really_long', 59), ('very_long_species_name_number_0260_with_lots_of_extra_characters_to_make_it_really_long', 60), ('very_long_species_name_number_0261_with_lots_of_extra_characters_to_make_it_really_long', 61), ('very_long_species_name_number_0262_with_lots_of_extra_characters_to_make_it_really_long', 62), ('very_long_species_name_number_0263_with_lots_of_extra_characters_to_make_it_really_long', 63), ('very_long_species_name_number_0264_with_lots_of_extra_characters_to_make_it_really_long', 64), ('very_long_species_name_number_0265_with_lots_of_extra_characters_to_make_it_really_long', 65), ('very_long_species_name_number_0266_with_lots_of_extra_characters_to_make_it_really_long', 66), ('very_long_species_name_number_0267_with_lots_of_extra_characters_to_make_it_really_long', 67), ('very_long_species_name_number_0268_with_lots_of_extra_characters_to_make_it_really_long', 68), ('very_long_species_name_number_0269_with_lots_of_extra_characters_to_make_it_really_long', 69), ('very_long_species_name_number_0270_with_lots_of_extra_characters_to_make_it_really_long', 70), ('very_long_species_name_number_0271_with_lots_of_extra_characters_to_make_it_really_long', 71), ('very_long_species_name_number_0272_with_lots_of_extra_characters_to_make_it_really_long', 72), ('very_long_species_name_number_0273_with_lots_of_extra_characters_to_make_it_really_long', 73), ('very_long_species_name_number_0274_with_lots_of_extra_characters_to_make_it_really_long', 74), ('very_long_species_name_number_0275_with_lots_of_extra_characters_to_make_it_really_long', 75), ('very_long_species_name_number_0276_with_lots_of_extra_characters_to_make_it_really_long', 76), ('very_long_species_name_number_0277_with_lots_of_extra_characters_to_make_it_really_long', 77), ('very_long_species_name_number_0278_with_lots_of_extra_characters_to_make_it_really_long', 78), ('very_long_species_name_number_0279_with_lots_of_extra_characters_to_make_it_really_long', 79), ('very_long_species_name_number_0280_with_lots_of_extra_characters_to_make_it_really_long', 80), ('very_long_species_name_number_0281_with_lots_of_extra_characters_to_make_it_really_long', 81), ('very_long_species_name_number_0282_with_lots_of_extra_characters_to_make_it_really_long', 82), ('very_long_species_name_number_0283_with_lots_of_extra_characters_to_make_it_really_long', 83), ('very_long_species_name_number_0284_with_lots_of_extra_characters_to_make_it_really_long', 84), ('very_long_species_name_number_0285_with_lots_of_extra_characters_to_make_it_really_long', 85), ('very_long_species_name_number_0286_with_lots_of_extra_characters_to_make_it_really_long', 86), ('very_long_species_name_number_0287_with_lots_of_extra_characters_to_make_it_really_long', 87), ('very_long_species_name_number_0288_with_lots_of_extra_characters_to_make_it_really_long', 88), ('very_long_species_name_number_0289_with_lots_of_extra_characters_to_make_it_really_long', 89), ('very_long_species_name_number_0290_with_lots_of_extra_characters_to_make_it_really_long', 90), ('very_long_species_name_number_0291_with_lots_of_extra_characters_to_make_it_really_long', 91), ('very_long_species_name_number_0292_with_lots_of_extra_characters_to_make_it_really_long', 92), ('very_long_species_name_number_0293_with_lots_of_extra_characters_to_make_it_really_long', 93), ('very_long_species_name_number_0294_with_lots_of_extra_characters_to_make_it_really_long', 94), ('very_long_species_name_number_0295_with_lots_of_extra_characters_to_make_it_really_long', 95), ('very_long_species_name_number_0296_with_lots_of_extra_characters_to_make_it_really_long', 96), ('very_long_species_name_number_0297_with_lots_of_extra_characters_to_make_it_really_long', 97), ('very_long_species_name_number_0298_with_lots_of_extra_characters_to_make_it_really_long', 98), ('very_long_species_name_number_0299_with_lots_of_extra_characters_to_make_it_really_long', 99), ('very_long_species_name_number_0300_with_lots_of_extra_characters_to_make_it_really_long', 0), ('very_long_species_name_number_0301_with_lots_of_extra_characters_to_make_it_really_long', 1), ('very_long_species_name_number_0302_with_lots_of_extra_characters_to_make_it_really_long', 2), ('very_long_species_name_number_0303_with_lots_of_extra_characters_to_make_it_really_long', 3), ('very_long_species_name_number_0304_with_lots_of_extra_characters_to_make_it_really_long', 4), ('very_long_species_name_number_0305_with_lots_of_extra_characters_to_make_it_really_long', 5), ('very_long_species_name_number_0306_with_lots_of_extra_characters_to_make_it_really_long', 6), ('very_long_species_name_number_0307_with_lots_of_extra_characters_to_make_it_really_long', 7), ('very_long_species_name_number_0308_with_l

... [10 lines truncated] ...

    90→    
    91→    async def handle_client(self, reader: asyncio.StreamReader, writer: asyncio.StreamWriter):
    92→        try:
    93→            # First message must be Hello
    94→            if not await self.handle_hello(reader, writer, is_client=True):
    95→                return
    96→            
    97→            while True:
    98→                msg_type, length, content = await self.read_message(reader)
    99→                if msg_type is None:
   100→                    break
   101→                    
   102→                if msg_type == 0x58:  # SiteVisit
   103→                    await self.handle_site_visit(content, writer)
   104→                else:
   105→                    await self.send_error(writer, f"Unexpected message type: {msg_type:02x}")
   106→                    break
   107→                    
   108→        except Exception as e:
   109→            if DEBUG:

<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>

   117→            await writer.wait_closed()
   118→    
   119→    async def handle_hello(self, reader: asyncio.StreamReader, writer: asyncio.StreamWriter, is_client: bool = False) -> bool:
   120→        try:
   121→            msg_type, length, content = await self.read_message(reader)
   122→            if msg_type != 0x50:
   123→                await self.send_error(writer, "First message must be Hello")
   124→                return False
   125→            
   126→            # Parse Hello message
   127→            offset = 0
   128→            protocol, offset = MessageParser.unpack_str(content, offset)
   129→            version, offset = MessageParser.unpack_u32(content, offset)
   130→            
   131→            if protocol != "pestcontrol" or version != 1:
   132→                await self.send_error(writer, "Invalid protocol or version")
   133→                return False
   134→            
   135→            if is_client:
   136→                # Send Hello response to client
   137→                await self.send_hello(writer)
   138→            
   139→            return True
   140→        except Exception as e:
   141→            await self.send_error(writer, f"Hello error: {e}")

<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 file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   115→        finally:
   116→            writer.close()
   117→            await writer.wait_closed()
   118→    
   119→    async def handle_hello(self, reader: asyncio.StreamReader, writer: asyncio.StreamWriter, is_client: bool = False) -> bool:
   120→        try:
   121→            msg_type, length, content = await self.read_message(reader)
   122→            if msg_type is None:
   123→                # Connection closed before getting a message
   124→                return False
   125→            
   126→            if msg_type != 0x50:
   127→                await self.send_error(writer, "First message must be Hello")
   128→                return False
   129→            
   130→            # Parse Hello message
   131→            offset = 0
   132→            protocol, offset = MessageParser.unpack_str(content, offset)
   133→            version, offset = MessageParser.unpack_u32(content, offset)
   134→            
   135→            if protocol != "pestcontrol" or version != 1:
   136→                await self.send_error(writer, "Invalid protocol or version")
   137→                return False
   138→            
   139→            if is_client:
   140→                # Send Hello response to client
   141→                await self.send_hello(writer)
   142→            
   143→            return True
   144→        except ProtocolError as e:
   145→            await self.send_error(writer, str(e))
   146→            return False
   147→        except Exception as e:
   148→            await self.send_error(writer, f"Protocol error: {e}")
   149→            return False
   150→    
   151→    async def send_hello(self, writer: asyncio.StreamWriter):
   152→        content = MessageParser.pack_str("pestcontrol") + MessageParser.pack_u32(1)
   153→        message = MessageParser.pack_message(0x50, content)

Testing bad Hello messages...

Test 1: Sending SiteVisit as first message
✓ Received Error message: First message must be Hello

Test 2: Sending Hello with bad protocol
✓ Received Error message: Invalid protocol or version

Test 3: Sending Hello with bad version
✓ Received Error message: Invalid protocol or version

Testing concurrent bad Hello messages...

Test: Two connections sending non-Hello messages simultaneously
Connection 1: Connected
Connection 1: Sending bad message (type 58)
Connection 2: Connected
Connection 2: Sending bad message (type 58)
Connection 1: ✓ Received Error: 'First message must be Hello'
Connection 2: ✓ Received Error: 'First message must be Hello'

Both connections completed in 0.00 seconds
Successful error responses: 2/2
✓ All connections received proper Error responses

The file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   153→        message = MessageParser.pack_message(0x50, content)
   154→        writer.write(message)
   155→        await writer.drain()
   156→    
   157→    async def send_error(self, writer: asyncio.StreamWriter, error_msg: str):
   158→        try:
   159→            content = MessageParser.pack_str(error_msg)
   160→            message = MessageParser.pack_message(0x51, content)
   161→            writer.write(message)
   162→            await writer.drain()
   163→        except Exception as e:
   164→            print(f"[LOG] Error sending error message: {e}")
   165→    
   166→    async def send_ok(self, writer: asyncio.StreamWriter):
   167→        message = MessageParser.pack_message(0x52, b'')
   168→        writer.write(message)

Testing exact bad hello scenario...
[2] Connected
[2] Sending invalid first message
[2] ✓ Received Error: 'First message must be Hello'
[2] ✓ Error message matches expectation
[1] Connected
[1] Sending invalid first message
[1] ✓ Received Error: 'First message must be Hello'
[1] ✓ Error message matches expectation

Results: 2/2 connections got proper Error responses
✓ Test PASSED - Both connections received proper error responses

The file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   122→            if msg_type is None:
   123→                # Connection closed before getting a message
   124→                return False
   125→            
   126→            if msg_type != 0x50:
   127→                await self.send_error(writer, "first message must be Hello")
   128→                return False
   129→            
   130→            # Parse Hello message
   131→            offset = 0
   132→            protocol, offset = MessageParser.unpack_str(content, offset)

Testing exact bad hello scenario...
[1] Connected
[1] Sending invalid first message
[2] Connected
[2] Sending invalid first message
[2] ✓ Received Error: 'first message must be Hello'
[2] ✓ Error message matches expectation
[1] ✓ Received Error: 'first message must be Hello'
[1] ✓ Error message matches expectation

Results: 2/2 connections got proper Error responses
✓ Test PASSED - Both connections received proper error responses

     1→#!/usr/bin/env python3
     2→import asyncio
     3→import os
     4→import struct
     5→import sys
     6→from typing import Dict, List, Optional, Tuple, Set
     7→from dataclasses import dataclass
     8→import logging
     9→
    10→DEBUG = False
    11→if 'DEBUG' in os.environ or (len(sys.argv) > 1 and '--debug' in sys.argv):
    12→    logging.basicConfig(level=logging.DEBUG)
    13→    DEBUG = True
    14→
    15→@dataclass

<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 file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
     6→from typing import Dict, List, Optional, Tuple, Set
     7→from dataclasses import dataclass
     8→import logging
     9→
    10→if 'DEBUG' in os.environ or (len(sys.argv) > 1 and '--debug' in sys.argv):
    11→    logging.basicConfig(level=logging.DEBUG, format='%(asctime)s - %(levelname)s - %(message)s')
    12→else:
    13→    logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
    14→
    15→logger = logging.getLogger(__name__)
    16→
    17→@dataclass
    18→class TargetPopulation:
    19→    species: str

89:        print(f"Pest Control Server listening on port {self.port}")
112:                print(f"Client error: {e}")
141:            print(f"[LOG] Received message type: {msg_type}, length: {length}, content: {content.hex()}")
168:            print(f"[LOG] Error sending error message: {e}")
226:        print(f"[LOG] Site visit for site {site_id}: {[(p.species, p.count) for p in populations]}")
239:            print(f"[LOG] Error handling site visit: {e}")
292:                    print(f"Connected to authority for site {site_id}, targets: {[(t.species, t.min_count, t.max_count) for t in targets]}")
296:                    print(f"Failed to connect to authority for site {site_id}: {e}")
333:                        print(f"Deleted policy {current_policy.policy_id} for {species} (now within range)")
344:                            print(f"Deleted old policy {current_policy.policy_id} for {species}")
351:                        print(f"Created policy {policy_id} to {action_str} {species} (count: {observed_count})")
398:            print(f"Usage: {sys.argv[0]} [port] [--debug]")
401:    print(f"Starting server on port {port}, DEBUG={DEBUG}")

Applied 10 edits to /home/smite/dev/protohackers/11-pest-control/server.py:
1. Replaced "        print(f"Pest Control Server listening on p..." with "        logger.info(f"Pest Control Server listenin..."
2. Replaced "                print(f"Client error: {e}")" with "                logger.debug(f"Client error: {e}")"
3. Replaced "            print(f"[LOG] Received message type: {..." with "            logger.debug(f"Received message type: ..."
4. Replaced "            print(f"[LOG] Error sending error mess..." with "            logger.error(f"Error sending error mes..."
5. Replaced "        print(f"[LOG] Site visit for site {site_id..." with "        logger.info(f"Site visit for site {site_id..."
6. Replaced "            print(f"[LOG] Error handling site visi..." with "            logger.error(f"Error handling site vis..."
7. Replaced "                    print(f"Connected to authority..." with "                    logger.debug(f"Connected to au..."
8. Replaced "                    print(f"Failed to connect to a..." with "                    logger.error(f"Failed to conne..."
9. Replaced "            print(f"Usage: {sys.argv[0]} [port] [-..." with "            logger.error(f"Usage: {sys.argv[0]} [p..."
10. Replaced "    print(f"Starting server on port {port}, DEBUG=..." with "    logger.info(f"Starting server on port {port}")"

111:            if DEBUG:
112-                logger.debug(f"Client error: {e}")
113-            try:
--
291:                if DEBUG:
292-                    logger.debug(f"Connected to authority for site {site_id}, targets: {[(t.species, t.min_count, t.max_count) for t in targets]}")
293-                
--
295:                if DEBUG:
296-                    logger.error(f"Failed to connect to authority for site {site_id}: {e}")
297-                raise
--
332:                    if DEBUG:
333-                        print(f"Deleted policy {current_policy.policy_id} for {species} (now within range)")
334-            else:
--
343:                        if DEBUG:
344-                            print(f"Deleted old policy {current_policy.policy_id} for {species}")
345-                    
--
349:                    if DEBUG:
350-                        action_str = "cull" if required_action == 0x90 else "conserve"
351-                        print(f"Created policy {policy_id} to {action_str} {species} (count: {observed_count})")

Applied 6 edits to /home/smite/dev/protohackers/11-pest-control/server.py:
1. Replaced "            if DEBUG:
                logger.debug..." with "                logger.debug(f"Client error: {e}")"
2. Replaced "                if DEBUG:
                    logg..." with "                    logger.debug(f"Connected to au..."
3. Replaced "                if DEBUG:
                    logg..." with "                    logger.error(f"Failed to conne..."
4. Replaced "                    if DEBUG:
                    ..." with "                        logger.debug(f"Deleted pol..."
5. Replaced "                        if DEBUG:
                ..." with "                            logger.debug(f"Deleted..."
6. Replaced "                    if DEBUG:
                    ..." with "                        action_str = "cull" if req..."

10:if 'DEBUG' in os.environ or (len(sys.argv) > 1 and '--debug' in sys.argv):
11:    logging.basicConfig(level=logging.DEBUG, format='%(asctime)s - %(levelname)s - %(message)s')

File "/home/smite/dev/protohackers/11-pest-control/server.py", line 112
    try:
        ^
IndentationError: unindent does not match any outer indentation level
/bin/bash: line 1: kill: (278781) - No such process

Test failed: [Errno 111] Connection refused

   108→                    break
   109→                    
   110→        except Exception as e:
   111→                logger.debug(f"Client error: {e}")
   112→            try:
   113→                await self.send_error(writer, str(e))
   114→            except:
   115→                pass

<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 file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   106→                else:
   107→                    await self.send_error(writer, f"Unexpected message type: {msg_type:02x}")
   108→                    break
   109→                    
   110→        except Exception as e:
   111→            logger.debug(f"Client error: {e}")
   112→            try:
   113→                await self.send_error(writer, str(e))
   114→            except:
   115→                pass
   116→        finally:
   117→            writer.close()
   118→            await writer.wait_closed()
   119→    

   288→                self.site_policies[site_id] = {}
   289→                
   290→                    logger.debug(f"Connected to authority for site {site_id}, targets: {[(t.species, t.min_count, t.max_count) for t in targets]}")
   291→                
   292→            except Exception as e:

<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 file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   284→                    targets.append(TargetPopulation(species, min_count, max_count))
   285→                
   286→                self.authority_connections[site_id] = (reader, writer)
   287→                self.site_targets[site_id] = targets
   288→                self.site_policies[site_id] = {}
   289→                
   290→                logger.debug(f"Connected to authority for site {site_id}, targets: {[(t.species, t.min_count, t.max_count) for t in targets]}")
   291→                
   292→            except Exception as e:
   293→                    logger.error(f"Failed to connect to authority for site {site_id}: {e}")
   294→                raise
   295→    
   296→    async def update_policies(self, site_id: int, populations: List[ObservedPopulation]):

The file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   288→                self.site_policies[site_id] = {}
   289→                
   290→                logger.debug(f"Connected to authority for site {site_id}, targets: {[(t.species, t.min_count, t.max_count) for t in targets]}")
   291→                
   292→            except Exception as e:
   293→                logger.error(f"Failed to connect to authority for site {site_id}: {e}")
   294→                raise
   295→    
   296→    async def update_policies(self, site_id: int, populations: List[ObservedPopulation]):
   297→        if site_id not in self.authority_connections:
   298→            return

   327→                    # Delete existing policy
   328→                    await self.delete_policy(site_id, current_policy.policy_id)
   329→                        logger.debug(f"Deleted policy {current_policy.policy_id} for {species} (now within range)")
   330→            else:
   331→                # Policy needed

<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 file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   323→            
   324→            if required_action is None:
   325→                # No policy needed
   326→                if current_policy:
   327→                    # Delete existing policy
   328→                    await self.delete_policy(site_id, current_policy.policy_id)
   329→                    logger.debug(f"Deleted policy {current_policy.policy_id} for {species} (now within range)")
   330→            else:
   331→                # Policy needed
   332→                if current_policy and current_policy.action == required_action:
   333→                    # Keep existing policy

   337→                    if current_policy:
   338→                        await self.delete_policy(site_id, current_policy.policy_id)
   339→                            logger.debug(f"Deleted old policy {current_policy.policy_id} for {species}")
   340→                    
   341→                    # Create new policy

<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 file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   333→                    # Keep existing policy
   334→                    new_policies[species] = current_policy
   335→                else:
   336→                    # Delete old policy if exists
   337→                    if current_policy:
   338→                        await self.delete_policy(site_id, current_policy.policy_id)
   339→                        logger.debug(f"Deleted old policy {current_policy.policy_id} for {species}")
   340→                    
   341→                    # Create new policy
   342→                    policy_id = await self.create_policy(site_id, species, required_action)
   343→                    new_policies[species] = Policy(policy_id, species, required_action)
   344→                        action_str = "cull" if required_action == 0x90 else "conserve"
   345→                        logger.debug(f"Created policy {policy_id} to {action_str} {species} (count: {observed_count})")

The file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   337→                    if current_policy:
   338→                        await self.delete_policy(site_id, current_policy.policy_id)
   339→                        logger.debug(f"Deleted old policy {current_policy.policy_id} for {species}")
   340→                    
   341→                    # Create new policy
   342→                    policy_id = await self.create_policy(site_id, species, required_action)
   343→                    new_policies[species] = Policy(policy_id, species, required_action)
   344→                    action_str = "cull" if required_action == 0x90 else "conserve"
   345→                    logger.debug(f"Created policy {policy_id} to {action_str} {species} (count: {observed_count})")
   346→        
   347→        self.site_policies[site_id] = new_policies
   348→    
   349→    async def create_policy(self, site_id: int, species: str, action: int) -> int:

Connected to server
Sending Hello: 50000000190000000b70657374636f6e74726f6c00000001ce
Received response: 50000000190000000b70657374636f6e74726f6c00000001ce
Received Hello response - SUCCESS!
2025-08-25 12:56:25,794 - DEBUG - Using selector: EpollSelector
2025-08-25 12:56:25,796 - INFO - Starting server on port 8081
2025-08-25 12:56:25,797 - INFO - Pest Control Server listening on port 8081
2025-08-25 12:56:26,735 - DEBUG - Received message type: 80, length: 25, content: 0000000b70657374636f6e74726f6c00000001

Connected to server
Sending Hello...
Received Hello response
Sending SiteVisit for site 12345 with populations: [('dog', 5), ('cat', 2), ('rat', 15)]
SiteVisit sent - no response expected per protocol

2025-08-25 13:00:32,911 - DEBUG - Using selector: EpollSelector
2025-08-25 13:00:32,912 - INFO - Starting server on port 8081
2025-08-25 13:00:32,912 - INFO - Pest Control Server listening on port 8081

Test failed: [Errno 111] Connection refused

2025-08-25 13:01:29,124 - INFO - Starting server on port 8080
2025-08-25 13:01:29,125 - INFO - Pest Control Server listening on port 8080

Testing with specific invalid message...
Connected to server
Sending invalid message: 990000000d696e76616c696473
Waiting for response...
Raw response (37 bytes): 51000000250000001b6669727374206d657373616765206d7573742062652048656c6c6f5e
Message type: 0x51, Length: 37
Error message: 'first message must be Hello'
✓ Got error response: 'first message must be Hello'
✓ Error text is correct

Testing SiteVisit as first message...
Connected to server
Sending SiteVisit message: 580000000e000030390000000031
Waiting for response...
Raw response (37 bytes): 51000000250000001b6669727374206d657373616765206d7573742062652048656c6c6f5e
Message type: 0x51, Length: 37
Error message: 'first message must be Hello'
✓ Got error response: 'first message must be Hello'
✓ Error text is correct

2025-08-25 13:01:57,320 - INFO - Starting server on port 8080
2025-08-25 13:01:57,321 - INFO - Pest Control Server listening on port 8080

Testing with specific invalid message...
Connected to server
Sending invalid message: 990000000d696e76616c696473
Waiting for response...
Raw response (37 bytes): 51000000250000001b6669727374206d657373616765206d7573742062652048656c6c6f5e
Message type: 0x51, Length: 37
Error message: 'first message must be Hello'
✓ Got error response: 'first message must be Hello'
✓ Error text is correct

Testing SiteVisit as first message...
Connected to server
Sending SiteVisit message: 580000000e000030390000000031
Waiting for response...
Raw response (37 bytes): 51000000250000001b6669727374206d657373616765206d7573742062652048656c6c6f5e
Message type: 0x51, Length: 37
Error message: 'first message must be Hello'
✓ Got error response: 'first message must be Hello'
✓ Error text is correct

   151→            await self.send_error(writer, f"Protocol error: {e}")
   152→            return False
   153→    
   154→    async def send_hello(self, writer: asyncio.StreamWriter):
   155→        content = MessageParser.pack_str("pestcontrol") + MessageParser.pack_u32(1)
   156→        message = MessageParser.pack_message(0x50, content)
   157→        writer.write(message)
   158→        await writer.drain()
   159→    
   160→    async def send_error(self, writer: asyncio.StreamWriter, error_msg: str):
   161→        try:
   162→            content = MessageParser.pack_str(error_msg)
   163→            message = MessageParser.pack_message(0x51, content)
   164→            writer.write(message)
   165→            await writer.drain()
   166→        except Exception as e:
   167→            logger.error(f"Error sending error message: {e}")
   168→    
   169→    async def send_ok(self, writer: asyncio.StreamWriter):
   170→        message = MessageParser.pack_message(0x52, b'')

<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>

2025-08-25 13:06:01,054 - DEBUG - Using selector: EpollSelector
2025-08-25 13:06:01,055 - INFO - Starting server on port 8080
2025-08-25 13:06:01,055 - INFO - Pest Control Server listening on port 8080

Testing exact scenario as protohacker test...
Starting both connections simultaneously...
[1] Connecting...
[1] Connected
[1] Sending bad message
[2] Connecting...
[2] Connected
[2] Sending bad message
[1] Got complete message (type 0x51, 37 bytes)
[1] ✓ Error message: 'first message must be Hello'
[2] Got complete message (type 0x51, 37 bytes)
[2] ✓ Error message: 'first message must be Hello'

Completed in 0.00s
Successful responses: 2/2
✓ PASS: Both connections got proper Error responses

The file /home/smite/dev/protohackers/11-pest-control/server.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   156→        message = MessageParser.pack_message(0x50, content)
   157→        writer.write(message)
   158→        await writer.drain()
   159→    
   160→    async def send_error(self, writer: asyncio.StreamWriter, error_msg: str):
   161→        try:
   162→            content = MessageParser.pack_str(error_msg)
   163→            message = MessageParser.pack_message(0x51, content)
   164→            writer.write(message)
   165→            await writer.drain()
   166→            # Small delay to ensure message is sent before potential connection close
   167→            await asyncio.sleep(0.001)
   168→        except Exception as e:
   169→            logger.error(f"Error sending error message: {e}")
   170→    
   171→    async def send_ok(self, writer: asyncio.StreamWriter):
   172→        message = MessageParser.pack_message(0x52, b'')
   173→        writer.write(message)

2025-08-25 13:06:21,849 - INFO - Starting server on port 8080
2025-08-25 13:06:21,849 - INFO - Pest Control Server listening on port 8080

Testing exact scenario as protohacker test...
Starting both connections simultaneously...
[1] Connecting...
[1] Connected
[1] Sending bad message
[2] Connecting...
[2] Connected
[2] Sending bad message
[1] Got complete message (type 0x51, 37 bytes)
[1] ✓ Error message: 'first message must be Hello'
[2] Got complete message (type 0x51, 37 bytes)
[2] ✓ Error message: 'first message must be Hello'

Completed in 0.00s
Successful responses: 2/2
✓ PASS: Both connections got proper Error responses