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@@ -0,0 +1,180 @@
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+package main
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+
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+import (
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+ "fmt"
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+ "github.com/docker/distribution/context"
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+ "github.com/docker/docker/api/types"
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+ "github.com/docker/docker/api/types/filters"
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+ "github.com/docker/docker/client"
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+ "os"
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+ "os/signal"
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+ "sort"
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+ "strings"
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+ "syscall"
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+ "text/template"
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+ "time"
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+)
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+
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+type Container struct {
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+ Id string
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+ Name string
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+ Labels map[string]string
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+}
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+
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+type Context struct {
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+ Containers map[string]Container
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+}
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+
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+var funcMap = template.FuncMap{
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+ "replace": func(from, to, input string) string { return strings.Replace(input, from, to, -1) },
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+ "split": func(sep, input string) []string { return strings.Split(input, sep) },
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+ "join": func(sep string, input []string) string { return strings.Join(input, sep) },
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+ "sortlines": func(input string) string {
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+ lines := strings.Split(input, "\n")
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+ sort.Strings(lines)
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+ return strings.Join(lines, "\n")
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+ },
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+}
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+
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+func main() {
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+ sigs := make(chan os.Signal, 1)
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+ done := make(chan bool, 1)
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+ containerChan := make(chan Container, 1)
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+ expiryChan := make(chan string, 1)
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+
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+ signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
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+
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+ cli, err := client.NewEnvClient()
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+ if err != nil {
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+ panic(err)
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+ }
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+
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+ go func() {
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+ sig := <-sigs
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+ fmt.Printf("Received %s signal\n", sig)
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+ err := cli.Close()
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+ if err != nil {
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+ panic(err)
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+ }
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+ done <- true
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+ }()
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+
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+ go func() {
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+ const deletionTime = 10 * time.Second
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+
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+ expiryTimes := make(map[string]time.Time)
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+ expiryTimer := time.NewTimer(time.Hour)
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+ nextExpiry := time.Now()
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+ expiryTimer.Stop()
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+
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+ args := filters.NewArgs()
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+ args.Add("type", "container")
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+ args.Add("event", "create")
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+ args.Add("event", "destroy")
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+ eventsChan, errChan := cli.Events(context.Background(), types.EventsOptions{Filters: args})
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+
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+ containers, err := cli.ContainerList(context.Background(), types.ContainerListOptions{})
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+ if err != nil {
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+ panic(err)
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+ }
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+
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+ for _, container := range containers {
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+ containerChan <- Container{
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+ Id: container.ID,
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+ Name: container.Names[0][1:],
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+ Labels: container.Labels,
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+ }
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+ }
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+
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+ for {
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+ select {
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+ case event := <-eventsChan:
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+ if event.Action == "create" {
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+ container, err := cli.ContainerInspect(context.Background(), event.Actor.ID)
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+ if err != nil {
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+ panic(err)
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+ }
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+ containerChan <- Container{
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+ Id: container.ID,
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+ Name: container.Name[1:],
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+ Labels: container.Config.Labels,
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+ }
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+ } else {
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+ now := time.Now()
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+ expiryTime := now.Add(deletionTime)
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+ expiryTimes[event.Actor.Attributes["name"]] = expiryTime
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+ fmt.Printf("Scheduling expiry timer for %s\n", event.Actor.Attributes["name"])
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+ if nextExpiry.Before(now) || nextExpiry.After(expiryTime) {
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+ fmt.Printf("Starting expiry timer with default duration\n")
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+ expiryTimer.Reset(deletionTime + 1*time.Second)
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+ nextExpiry = expiryTime
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+ }
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+ }
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+
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+ case <-expiryTimer.C:
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+ now := time.Now()
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+ next := 0 * time.Second
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+
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+ for name, expiryTime := range expiryTimes {
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+ if expiryTime.Before(now) {
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+ fmt.Printf("Expiring %s\n", name)
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+ delete(expiryTimes, name)
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+ expiryChan <- name
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+ } else if next == 0 || expiryTime.Sub(now) < next {
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+ next = expiryTime.Sub(now)
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+ }
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+ }
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+
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+ if next > 0 {
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+ fmt.Printf("Starting expiry timer with duration %s\n", next)
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+ expiryTimer.Reset(next + 1*time.Second)
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+ nextExpiry = now.Add(next)
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+ }
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+
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+ case err := <-errChan:
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+ panic(err)
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+ }
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+ }
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+ }()
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+
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+ go func() {
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+ var templates []*template.Template
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+ containers := make(map[string]Container)
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+ timer := time.NewTimer(time.Hour)
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+ timer.Stop()
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+
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+ tmpl, err := template.New("domains.txt.tpl").Funcs(funcMap).ParseFiles("./templates/domains.txt.tpl")
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+ if err != nil {
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+ panic(err)
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+ }
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+ templates = append(templates, tmpl)
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+
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+ tmpl, err = template.New("haproxy.cfg.tpl").Funcs(funcMap).ParseFiles("./templates/haproxy.cfg.tpl")
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+ if err != nil {
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+ panic(err)
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+ }
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+ templates = append(templates, tmpl)
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+
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+ for {
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+ select {
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+ case container := <-containerChan:
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+ containers[container.Name] = container
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+ timer.Reset(100 * time.Millisecond)
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+ case name := <-expiryChan:
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+ delete(containers, name)
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+ timer.Reset(100 * time.Millisecond)
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+ case <-timer.C:
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+ for _, tmpl := range templates {
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+ fmt.Printf("--- Writing %s ---\n", tmpl.Name())
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+ err = tmpl.Execute(os.Stdout, Context{Containers: containers})
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+ fmt.Printf("--- / writing %s ---\n", tmpl.Name())
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+ if err != nil {
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+ panic(err)
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+ }
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+ }
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+ }
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+ }
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+ }()
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+
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+ <-done
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+}
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