Consul Roll — A Rick Roll service registrator for Consul

consul-roll.go

package main

import (
    "log"
    "os"
    "strconv"
    "time"

    "github.com/hashicorp/consul/api"
)

// RegisterService registers a service into the catalog
func RegisterService(ag *api.Agent, service, hostname, node, protocol string, port int) error {

    consulService := api.AgentServiceRegistration{
        ID:   service,
        Name: service,
        Tags: []string{time.Now().Format("Jan 02 15:04:05.000 EST")},
        Port: port,
        Check: &api.AgentServiceCheck{
            Script:   "curl --connect-timeout=5 " + protocol + "://" + hostname + ":" + strconv.Itoa(port),
            Interval: "10s",
            Timeout:  "8s",
            TTL:      "",
            HTTP:     protocol + "://" + hostname + ":" + strconv.Itoa(port),
            Status:   "passing",
        },
        Checks: api.AgentServiceChecks{},
    }

    err := ag.ServiceRegister(&consulService)
    if err != nil {
        return err
    }

    return err
}

func getenv(key, fallback string) string {
    value := os.Getenv(key)
    if len(value) == 0 {
        log.Printf("✳️  Ricky needs a node! Set CONSUL_HTTP_ADDR to host:port")
        log.Printf("✳️  Address set to: localhost:8500 (which might not work!)")
        return fallback
    }
    return value
}

func main() {
    consulAddress := getenv("CONSUL_HTTP_ADDR", "localhost:8500")
    config := api.DefaultConfig()
    config.Address = consulAddress
    config.Datacenter = "dc1"
    client, err := api.NewClient(api.DefaultConfig())
    if err != nil {
        log.Fatalf("🚫  Dave, I cannot do the thing with the client: %v\n", err)
        return
    }

    srvRegistrator := client.Agent()
    log.Printf("🎤  Rickrolling the Consul cluster node at %v ...",
        consulAddress)
    if err = RegisterService(srvRegistrator,
        "Never gonna give you up",
        "www.youtube.com/watch?v=dQw4w9WgXcQ",
        "youtube",
        "https",
        443); err != nil {
        log.Fatalf("🚫  Dave, I cannot do the thing with the service: %v", err)
        return
    }

    if err = RegisterService(srvRegistrator,
        "Never gonna let you down",
        "www.youtube.com/watch?v=dQw4w9WgXcQ",
        "rickroll",
        "https",
        443); err != nil {
        log.Fatalf("🚫  Dave, I cannot do the thing with the service: %v", err)
        return
    }

    if err = RegisterService(srvRegistrator,
        "Never gonna run around and desert you",
        "www.youtube.com/watch?v=dQw4w9WgXcQ",
        "youtube",
        "https",
        443); err != nil {
        log.Fatalf("Service registration failed: %v", err)
        return
    }

    log.Printf("✨  Success, cluster 9001%% more awesome!")
}