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feat: cap concurrent connections with semaphore

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Add max_connections config (default 256) with -m/--max-connections CLI
flag. Server wraps on_client in asyncio.Semaphore to prevent fd
exhaustion under load. Value reloads on SIGHUP; active connections
drain normally. Also adds pool_size/pool_max_idle config fields and
first_hop_pool wiring in server.py (used by next commits), and fixes
asyncio.TimeoutError -> TimeoutError lint warnings.
This commit is contained in:
user
2026-02-15 17:55:50 +01:00
parent 076213a830
commit 714e8efb3d
5 changed files with 61 additions and 7 deletions
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3
config/example.yaml
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@@ -5,6 +5,9 @@ listen: 127.0.0.1:1080
timeout: 10
retries: 3 # max attempts per connection (proxy_source only)
log_level: info
# max_connections: 256 # max concurrent client connections (backpressure)
# pool_size: 0 # pre-warmed TCP connections to first hop (0 = disabled)
# pool_max_idle: 30 # max idle time (seconds) for pooled connections
# Proxy chain -- connections tunnel through each hop in order.
# Supported protocols: socks5://, socks4://, http://