mirror of
https://gitee.com/wanwujie/deer-flow
synced 2026-04-03 14:22:13 +08:00
4b69aed47b
Add thread-safe port allocation and proper cleanup on process exit to prevent port conflicts in concurrent environments and ensure containers are stopped when the application terminates. Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
136 lines
4.1 KiB
Python
136 lines
4.1 KiB
Python
"""Thread-safe network utilities."""
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import socket
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import threading
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from contextlib import contextmanager
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class PortAllocator:
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"""Thread-safe port allocator that prevents port conflicts in concurrent environments.
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This class maintains a set of reserved ports and uses a lock to ensure that
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port allocation is atomic. Once a port is allocated, it remains reserved until
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explicitly released.
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Usage:
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allocator = PortAllocator()
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# Option 1: Manual allocation and release
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port = allocator.allocate(start_port=8080)
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try:
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# Use the port...
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finally:
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allocator.release(port)
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# Option 2: Context manager (recommended)
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with allocator.allocate_context(start_port=8080) as port:
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# Use the port...
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# Port is automatically released when exiting the context
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"""
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def __init__(self):
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self._lock = threading.Lock()
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self._reserved_ports: set[int] = set()
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def _is_port_available(self, port: int) -> bool:
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"""Check if a port is available for binding.
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Args:
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port: The port number to check.
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Returns:
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True if the port is available, False otherwise.
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"""
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if port in self._reserved_ports:
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return False
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with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
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try:
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s.bind(("localhost", port))
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return True
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except OSError:
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return False
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def allocate(self, start_port: int = 8080, max_range: int = 100) -> int:
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"""Allocate an available port in a thread-safe manner.
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This method is thread-safe. It finds an available port, marks it as reserved,
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and returns it. The port remains reserved until release() is called.
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Args:
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start_port: The port number to start searching from.
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max_range: Maximum number of ports to search.
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Returns:
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An available port number.
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Raises:
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RuntimeError: If no available port is found in the specified range.
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"""
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with self._lock:
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for port in range(start_port, start_port + max_range):
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if self._is_port_available(port):
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self._reserved_ports.add(port)
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return port
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raise RuntimeError(f"No available port found in range {start_port}-{start_port + max_range}")
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def release(self, port: int) -> None:
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"""Release a previously allocated port.
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Args:
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port: The port number to release.
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"""
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with self._lock:
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self._reserved_ports.discard(port)
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@contextmanager
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def allocate_context(self, start_port: int = 8080, max_range: int = 100):
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"""Context manager for port allocation with automatic release.
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Args:
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start_port: The port number to start searching from.
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max_range: Maximum number of ports to search.
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Yields:
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An available port number.
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"""
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port = self.allocate(start_port, max_range)
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try:
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yield port
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finally:
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self.release(port)
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# Global port allocator instance for shared use across the application
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_global_port_allocator = PortAllocator()
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def get_free_port(start_port: int = 8080, max_range: int = 100) -> int:
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"""Get a free port in a thread-safe manner.
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This function uses a global port allocator to ensure that concurrent calls
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don't return the same port. The port is marked as reserved until release_port()
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is called.
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Args:
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start_port: The port number to start searching from.
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max_range: Maximum number of ports to search.
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Returns:
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An available port number.
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Raises:
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RuntimeError: If no available port is found in the specified range.
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"""
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return _global_port_allocator.allocate(start_port, max_range)
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def release_port(port: int) -> None:
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"""Release a previously allocated port.
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Args:
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port: The port number to release.
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"""
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_global_port_allocator.release(port)
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