Only ever run one scan at the same time

Also use a logging library

main.go

@@ -3,78 +3,32 @@ package main
 import (
 	"fmt"
 	"net/http"
+	"os"
 
-	"github.com/docker/docker/client"
+	"github.com/sirupsen/logrus"
 )
 
-func checkForUpdates() {
-	cli, err := client.NewEnvClient()
-	if err != nil {
-		panic(err)
-	}
-
-	hub, err := anonymousClient()
-	if err != nil {
-		panic(err)
-	}
-
-	labeledContainers := getLabeledContainers(cli)
-	fmt.Println()
-
-	for _, lc := range labeledContainers {
-		owner, repository, tag := lc.SplitImageParts()
-
-		fmt.Printf("container image: %s\n", combineImageParts(owner, repository, nil))
-		fmt.Printf("  versioning: %+v\n", lc.Mode.Label())
-		fmt.Printf("  id: %s\n", lc.Container.ImageID)
-
-		if tag != nil {
-			fmt.Printf("  current tag: %s\n", *tag)
-		} else {
-			fmt.Printf("  no current tag, skipping\n")
-			continue
-		}
-
-		repoTags, err := getDockerRepoTags(hub, owner, repository)
-		if err != nil {
-			panic(err)
-		}
-
-		fmt.Println("  tags in registry:")
-		for _, tag := range repoTags {
-			fmt.Printf("  - \"%s\" %s\n", tag.Name, tag.Digest)
-			svt := parseTagAsSemVer(tag.Name)
-			if svt != nil {
-				fmt.Printf("    semver: true\n")
-			}
-		}
-
-		shouldUpdateTo := lc.Mode.ShouldUpdate(*tag, repoTags)
-		if shouldUpdateTo != nil {
-			fmt.Printf("  updating to: %s\n", shouldUpdateTo.Name)
-			err = lc.UpdateTo(cli, *shouldUpdateTo)
-			if err != nil {
-				panic(err)
-			}
-		} else {
-			fmt.Println("  no update available")
-		}
-	}
-	fmt.Println("All done")
-}
+var (
+	Logger logrus.Logger = *logrus.New()
+)
 
 func main() {
-	addr := "0.0.0.0:8000"
+	addr, isPresent := os.LookupEnv(ENV_ADDR)
+	if !isPresent {
+		addr = "0.0.0.0:8000"
+	}
 
 	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
-		go checkForUpdates()
+		TriggerScan()
 		fmt.Fprintf(w, "OK")
 	})
 
 	fs := http.FileServer(http.Dir("static/"))
 	http.Handle("/static/", http.StripPrefix("/static/", fs))
 
-	fmt.Printf("Listening on %s\n", addr)
+	Logger.Infof(`listening on %s`, addr)
+
+	go Worker()
 
 	err := http.ListenAndServe(addr, nil)
 	if err != nil {