reuseport - ActiveState ActiveGo 1.8
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Package reuseport

import "github.com/valyala/fasthttp/reuseport"
Overview
Index
Examples

Overview ▾

Package reuseport provides TCP net.Listener with SO_REUSEPORT support.

SO_REUSEPORT allows linear scaling server performance on multi-CPU servers. See https://www.nginx.com/blog/socket-sharding-nginx-release-1-9-1/ for more details :)

The package is based on https://github.com/kavu/go_reuseport .

func Listen 

func Listen(network, addr string) (net.Listener, error)

Listen returns TCP listener with SO_REUSEPORT option set.

The returned listener tries enabling the following TCP options, which usually have positive impact on performance:

- TCP_DEFER_ACCEPT. This option expects that the server reads from accepted 

connections before writing to them.

- TCP_FASTOPEN. See https://lwn.net/Articles/508865/ for details.

Use https://github.com/valyala/tcplisten if you want customizing these options.

Only tcp4 and tcp6 networks are supported.

ErrNoReusePort error is returned if the system doesn't support SO_REUSEPORT.

▾ Example

Code:

package reuseport_test

import (
    "fmt"
    "log"

    "github.com/valyala/fasthttp"
    "github.com/valyala/fasthttp/reuseport"
)

func ExampleListen() {
    ln, err := reuseport.Listen("tcp4", "localhost:12345")
    if err != nil {
        log.Fatalf("error in reuseport listener: %s", err)
    }

    if err = fasthttp.Serve(ln, requestHandler); err != nil {
        log.Fatalf("error in fasthttp Server: %s", err)
    }
}

func requestHandler(ctx *fasthttp.RequestCtx) {
    fmt.Fprintf(ctx, "Hello, world!")
}

type ErrNoReusePort

ErrNoReusePort is returned if the OS doesn't support SO_REUSEPORT. 

type ErrNoReusePort struct {
    // contains filtered or unexported fields
}

func (*ErrNoReusePort) Error 

func (e *ErrNoReusePort) Error() string

Error implements error interface.