add logging
This commit is contained in:
parent
dccdc00eec
commit
8a9d194984
1 changed files with 70 additions and 47 deletions
117
main.go
117
main.go
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@ -7,6 +7,7 @@ import (
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"net/http"
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"regexp"
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"strings"
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"sync"
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"github.com/docker/docker/api/types/image"
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"github.com/docker/docker/client"
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@ -16,7 +17,7 @@ import (
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"github.com/regclient/regclient/types/ref"
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)
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// Hilfsfunktion: registrykompatibles Format aus repo:tag erzeugen
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// Hilfsfunktion: registry/repo:tag für regclient
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func toRegistryImage(imageTag string) (string, error) {
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r := regexp.MustCompile(`^(?:(?P<registry>[^/]+)/)?(?P<repo>[^:]+)(?::(?P<tag>.+))?$`)
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match := r.FindStringSubmatch(imageTag)
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@ -35,7 +36,7 @@ func toRegistryImage(imageTag string) (string, error) {
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return fmt.Sprintf("%s/%s:%s", registry, repo, tag), nil
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}
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// Extrahiert nur den sha256:... Digest
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// Extrahiere nur den sha256:digest
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func extractDigest(s string) string {
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for _, part := range strings.Split(s, "@") {
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if strings.HasPrefix(part, "sha256:") {
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@ -45,31 +46,30 @@ func extractDigest(s string) string {
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return s
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}
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// Prometheus Collector-Struktur
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type dockerImageUpdateCollector struct {
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desc *prometheus.Desc
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type imageUpdateCollector struct {
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metric *prometheus.Desc
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}
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func newDockerImageUpdateCollector() prometheus.Collector {
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return &dockerImageUpdateCollector{
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desc: prometheus.NewDesc(
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func newImageUpdateCollector() *imageUpdateCollector {
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return &imageUpdateCollector{
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metric: prometheus.NewDesc(
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"docker_image_update_available",
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"Whether a new image digest is available for this local image tag (1=update, 0=current)",
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[]string{"image"},
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"Ob Update für das lokale Docker-Image für das Tag im Registry verfügbar ist (1=Update, 0=aktuell)",
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[]string{"image", "tag"},
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nil,
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),
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}
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}
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func (c *dockerImageUpdateCollector) Describe(ch chan<- *prometheus.Desc) {
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ch <- c.desc
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func (c *imageUpdateCollector) Describe(ch chan<- *prometheus.Desc) {
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ch <- c.metric
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}
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func (c *dockerImageUpdateCollector) Collect(ch chan<- prometheus.Metric) {
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func (c *imageUpdateCollector) Collect(ch chan<- prometheus.Metric) {
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ctx := context.Background()
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cli, err := client.NewClientWithOpts(client.FromEnv)
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if err != nil {
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log.Println("Docker-Client-Fehler:", err)
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log.Printf("Fehler bei Docker-Client: %v", err)
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return
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}
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defer cli.Close()
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@ -77,48 +77,71 @@ func (c *dockerImageUpdateCollector) Collect(ch chan<- prometheus.Metric) {
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images, err := cli.ImageList(ctx, image.ListOptions{All: true})
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if err != nil {
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log.Println("Docker-ImageList-Fehler:", err)
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log.Printf("Fehler bei ImageList: %v", err)
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return
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}
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var wg sync.WaitGroup
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for _, img := range images {
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for _, tag := range img.RepoTags {
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imageRef, err := toRegistryImage(tag)
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if err != nil {
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continue
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}
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var localDigest string
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if len(img.RepoDigests) > 0 {
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localDigest = extractDigest(img.RepoDigests[0])
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} else {
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localDigest = img.ID
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}
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refObj, err := ref.New(imageRef)
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if err != nil {
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continue
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}
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desc, err := rc.ManifestHead(ctx, refObj)
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if err != nil {
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continue
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}
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remoteDigest := desc.GetDigest().String()
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var value float64 = 0
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if localDigest != remoteDigest {
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value = 1
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}
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ch <- prometheus.MustNewConstMetric(
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c.desc,
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prometheus.GaugeValue,
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value,
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tag,
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)
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wg.Add(1)
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go func(tag string, img image.Summary) {
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defer wg.Done()
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imageRef, err := toRegistryImage(tag)
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if err != nil {
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log.Printf("ImageRef-Fehler bei %s: %v", tag, err)
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return
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}
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// Lokalen Digest holen
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var localDigest string
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if len(img.RepoDigests) > 0 {
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localDigest = extractDigest(img.RepoDigests[0])
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} else {
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localDigest = img.ID
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}
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// Remote Digest holen
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refObj, err := ref.New(imageRef)
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if err != nil {
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log.Printf("ImageRef (regclient) ungültig (%s): %v", tag, err)
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return
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}
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desc, err := rc.ManifestHead(ctx, refObj)
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if err != nil {
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log.Printf("Remote-Manifest nicht gefunden (%s): %v", tag, err)
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return
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}
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remoteDigest := desc.GetDigest().String()
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// Logging
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fmt.Printf("Image: %s\n Local Digest: %s\n Remote Digest: %s\n", tag, localDigest, remoteDigest)
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var update float64 = 0
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if localDigest != remoteDigest {
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fmt.Println(" -> Update verfügbar!")
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update = 1
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} else {
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fmt.Println(" -> Kein Update verfügbar.")
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}
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labelImg, labelTag := tag, "latest"
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if cp := strings.Split(tag, ":"); len(cp) == 2 {
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labelImg, labelTag = cp[0], cp[1]
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}
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ch <- prometheus.MustNewConstMetric(
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c.metric, prometheus.GaugeValue,
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update, labelImg, labelTag,
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)
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}(tag, img)
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}
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}
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wg.Wait()
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}
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func main() {
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prometheus.MustRegister(newDockerImageUpdateCollector())
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log.Println("Starte Docker-Image-Update Prometheus Exporter (Port 9788)...")
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exporter := newImageUpdateCollector()
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prometheus.MustRegister(exporter)
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http.Handle("/metrics", promhttp.Handler())
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log.Println("Prometheus Exporter läuft auf :9888/metrics")
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log.Fatal(http.ListenAndServe(":9888", nil))
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log.Fatal(http.ListenAndServe(":9788", nil))
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}
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