57 lines
1.6 KiB
Go
57 lines
1.6 KiB
Go
// +build linux darwin dragonfly freebsd netbsd openbsd rumprun
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// Package reuseport provides TCP net.Listener with SO_REUSEPORT support.
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//
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// SO_REUSEPORT allows linear scaling server performance on multi-CPU servers.
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// See https://www.nginx.com/blog/socket-sharding-nginx-release-1-9-1/ for more details :)
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//
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// The package is based on https://github.com/kavu/go_reuseport .
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package reuseport
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import (
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"fmt"
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"github.com/valyala/tcplisten"
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"net"
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"strings"
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)
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// ErrNoReusePort is returned if the OS doesn't support SO_REUSEPORT.
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type ErrNoReusePort struct {
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err error
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}
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// Error implements error interface.
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func (e *ErrNoReusePort) Error() string {
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return fmt.Sprintf("The OS doesn't support SO_REUSEPORT: %s", e.err)
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}
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// Listen returns TCP listener with SO_REUSEPORT option set.
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//
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// The returned listener tries enabling the following TCP options, which usually
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// have positive impact on performance:
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//
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// - TCP_DEFER_ACCEPT. This option expects that the server reads from accepted
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// connections before writing to them.
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//
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// - TCP_FASTOPEN. See https://lwn.net/Articles/508865/ for details.
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//
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// Use https://github.com/valyala/tcplisten if you want customizing
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// these options.
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//
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// Only tcp4 and tcp6 networks are supported.
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//
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// ErrNoReusePort error is returned if the system doesn't support SO_REUSEPORT.
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func Listen(network, addr string) (net.Listener, error) {
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ln, err := cfg.NewListener(network, addr)
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if err != nil && strings.Contains(err.Error(), "SO_REUSEPORT") {
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return nil, &ErrNoReusePort{err}
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}
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return ln, err
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}
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var cfg = &tcplisten.Config{
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ReusePort: true,
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DeferAccept: true,
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FastOpen: true,
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}
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