brockwood / go-varnish-client

Go library to programmatically access the Varnish administration port

Go client for the Varnish administration port

This repository contains a client library that can be used to connect to the Varnish administration port (typically used by the varnishadm tool).

NOTE: Experimental. Use at own peril!

Installation

Install this library via go get:

$ go get github.com/martin-helmich/go-varnish-client

Usage

Establish a connection

First, connect to the administration port using the varnishclient.DialTCP method:

client, err := varnishclient.DialTCP(context.Background(), "127.0.0.1:6082")
if err != nil {
    panic(err)
}

Authenticate

You can then use the client.AuthenticationRequired() method to check if the Varnish server requires authentication. Then, use the client.Authenticate() method to perform the authentication:

secret, _ := ioutil.ReadFile("/etc/varnish/secret")

if client.AuthenticationRequired() {
    err := client.Authenticate(context.Background(), secret)
    if err != nil {
        panic(err)
    }
}

Define and update a new configuration

ctx := context.Background()

err := client.DefineInlineVCL(ctx, "my-new-config", vclCode, "warm")
if err != nil {
    panic(err)
}

err = client.UseVCL(ctx, "my-new-config")
if err != nil {
    panic(err)
}

Define timeouts/cancellations on operations

All operations accept a context.Context parameter that can be used for timeouts and/or cancellations:

ctx, cancel := context.WithTimeout(context.Background(), 1 * time.Second)
defer cancel()

err := client.DefineInlineVCL(ctx, "my-new-config", vclCode, "warm")
if err != nil {
    panic(err)
}