Generate me a TCP echo server in python that listens to a port, and whatever is received, is returned unmodified, can handle at least 5 simultaneous clients.
Generate me a TCP echo server in python that listens to a port, and whatever is received, is returned unmodified, can handle at least 5 simultaneous clients.
I'll create a TCP echo server in Python that can handle multiple simultaneous clients. Let me break this down into tasks:
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
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/0-smoke-test/echo_server.py",
"content": "#!/usr/bin/env python3\nimport socket\nimport threading\nimport sys\n\ncla...{
"file_path": "/home/smite/dev/protohackers/0-smoke-test/echo_server.py",
"content": "#!/usr/bin/env python3\nimport socket\nimport threading\nimport sys\n\nclass EchoServer:\n def __init__(self, host='localhost', port=8080):\n self.host = host\n self.port = port\n self.server_socket = None\n \n def handle_client(self, client_socket, client_address):\n try:\n print(f\"Client connected: {client_address}\")\n while True:\n data = client_socket.recv(1024)\n if not data:\n break\n client_socket.send(data)\n except Exception as e:\n print(f\"Error handling client {client_address}: {e}\")\n finally:\n client_socket.close()\n print(f\"Client disconnected: {client_address}\")\n \n def start(self):\n try:\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 \n print(f\"Echo server listening on {self.host}:{self.port}\")\n print(\"Press Ctrl+C to stop the server\")\n \n while True:\n client_socket, client_address = self.server_socket.accept()\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 \n except KeyboardInterrupt:\n print(\"\\nShutting down server...\")\n except Exception as e:\n print(f\"Server error: {e}\")\n finally:\n if self.server_socket:\n self.server_socket.close()\n\ndef main():\n port = 8080\n if len(sys.argv) > 1:\n try:\n port = int(sys.argv[1])\n except ValueError:\n print(\"Invalid port number. Using default port 8080.\")\n \n server = EchoServer(port=port)\n server.start()\n\nif __name__ == \"__main__\":\n main()"
}
File created successfully at: /home/smite/dev/protohackers/0-smoke-test/echo_server.py
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": "chmod +x echo_server.py",
"description": "Make the echo server executable"
}{
"file_path": "/home/smite/dev/protohackers/0-smoke-test/test_client.py",
"content": "#!/usr/bin/env python3\nimport socket\nimport threading\nimport time\n\nde...{
"file_path": "/home/smite/dev/protohackers/0-smoke-test/test_client.py",
"content": "#!/usr/bin/env python3\nimport socket\nimport threading\nimport time\n\ndef test_client(client_id, host='localhost', port=8080):\n try:\n client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\n client_socket.connect((host, port))\n \n test_message = f\"Hello from client {client_id}!\"\n client_socket.send(test_message.encode())\n \n response = client_socket.recv(1024).decode()\n print(f\"Client {client_id}: Sent '{test_message}', Received '{response}'\")\n \n client_socket.close()\n return test_message == response\n except Exception as e:\n print(f\"Client {client_id} error: {e}\")\n return False\n\ndef main():\n num_clients = 5\n host = 'localhost'\n port = 8080\n \n print(f\"Testing echo server with {num_clients} simultaneous clients...\")\n \n threads = []\n for i in range(num_clients):\n thread = threading.Thread(target=test_client, args=(i+1, host, port))\n threads.append(thread)\n \n for thread in threads:\n thread.start()\n \n for thread in threads:\n thread.join()\n \n print(\"Test completed!\")\n\nif __name__ == \"__main__\":\n main()"
}
File created successfully at: /home/smite/dev/protohackers/0-smoke-test/test_client.py
{
"command": "chmod +x test_client.py",
"description": "Make the test client executable"
}{
"command": "python3 echo_server.py &",
"description": "Start the echo server in background",
"run_in_background": true
}Command running in background with ID: bash_1
{
"bash_id": "bash_1"
}<status>running</status> <timestamp>2025-08-16T11:10:08.658Z</timestamp>
{
"command": "sleep 2 && python3 test_client.py",
"description": "Wait for server to start then test with multiple clients"
}Testing echo server with 5 simultaneous clients... Client 2: Sent 'Hello from client 2!', Received 'Hello from client 2!' Client 5: Sent 'Hello from client 5!', Received ...
Testing echo server with 5 simultaneous clients... Client 2: Sent 'Hello from client 2!', Received 'Hello from client 2!' Client 5: Sent 'Hello from client 5!', Received 'Hello from client 5!' Client 3: Sent 'Hello from client 3!', Received 'Hello from client 3!' Client 4: Sent 'Hello from client 4!', Received 'Hello from client 4!' Client 1: Sent 'Hello from client 1!', Received 'Hello from client 1!' Test completed!
{
"shell_id": "bash_1"
}{"success":true,"message":"Successfully killed shell: bash_1 (python3 echo_server.py &)","shell_id":"bash_1"}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
Created a TCP echo server in echo_server.py that:
Usage:
python3 echo_server.py [port]
Test with:
python3 test_client.py
The test confirms all 5 clients successfully connected and received their echoed messages back correctly.