[Utils] Move network/socket utilities from common.py to network.py

[hnyls2002]

Summary

• Move 12+ network/socket functions from common.py to network.py: try_bind_socket, is_port_available, get_free_port, bind_port, get_open_port, wait_port_available, find_process_using_port, get_local_ip_auto, get_local_ip_by_nic, get_local_ip_by_remote, is_valid_ipv6_address, _get_addrinfos_for_bind
• Move ZMQ socket utilities: get_zmq_socket, get_zmq_socket_on_host, config_socket
• Update all import sites (18 files) to import directly from sglang.srt.utils.network
• No re-exports in common.py — clean separation between network and non-network utilities

Follows up on #20643.

[gemini-code-assist]

Summary of Changes

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This pull request significantly refactors the utility codebase by consolidating all network-related functions into a new, dedicated network.py file. This change improves code organization, making network utilities easier to locate, maintain, and test independently. By separating concerns, it enhances modularity and reduces the cognitive load when working with the common.py file, which previously contained a broad mix of unrelated utilities.

Highlights

• Code Refactoring: All network-related utility functions and their corresponding imports have been moved from python/sglang/srt/utils/common.py to a dedicated file, python/sglang/srt/utils/network.py.
• Network Utilities Consolidation: Functions for port management (get_open_port, is_port_available, try_bind_socket, get_free_port, bind_port, wait_port_available, find_process_using_port), IP address detection (is_valid_ipv6_address, get_local_ip_by_nic, get_local_ip_by_remote, get_local_ip_auto), and ZeroMQ socket handling (get_zmq_socket, get_zmq_socket_on_host, config_socket) are now centralized in network.py.
• Dependency Management: Imports for ipaddress, socket, zmq, logging, os, time, psutil, and specific typing utilities have been adjusted to reflect their new location and usage.

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Changelog

• python/sglang/srt/utils/common.py
  • Removed imports for ipaddress, socket, and zmq.
  • Removed network utility functions including find_process_using_port, wait_port_available, _get_addrinfos_for_bind, try_bind_socket, is_port_available, get_free_port, get_zmq_socket, get_zmq_socket_on_host, config_socket, bind_port, get_open_port, is_valid_ipv6_address, get_local_ip_by_nic, get_local_ip_by_remote, and get_local_ip_auto.
• python/sglang/srt/utils/network.py
  • Added imports for logging, os, time, psutil, zmq, and additional typing utilities.
  • Added network utility functions including get_open_port, is_valid_ipv6_address, find_process_using_port, wait_port_available, _get_addrinfos_for_bind, try_bind_socket, is_port_available, get_free_port, bind_port, get_zmq_socket_on_host, config_socket, get_local_ip_by_nic, get_local_ip_by_remote, get_local_ip_auto, and get_zmq_socket.

Activity

• The pull request was opened with a 'WIP' (Work In Progress) status, indicating that the author, hnyls2002, is still actively developing these changes and may not yet be ready for a full review.

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[gemini-code-assist]

Code Review

This pull request refactors the codebase by moving network-related utility functions from common.py to a dedicated network.py file. This is a good step towards better code organization. I've identified a critical bug in the wait_port_available function that could lead to an AttributeError or UnboundLocalError, and I've provided a suggestion to fix it.

[kirangowdac]

@hnyls2002,

This change is breaking many UTs as get_Zmq_socket moved to network but did not added in 'python/sglang/srt/utils/init.py'. Causing get_zmq_socket not found.

Can you pls handle 'init.py' as well accordingly.