Move code to pkg

pkg/provider/docker/label.go

@@ -0,0 +1,63 @@
+package docker
+
+import (
+	"fmt"
+
+	"github.com/containous/traefik/pkg/provider/label"
+)
+
+const (
+	labelDockerComposeProject = "com.docker.compose.project"
+	labelDockerComposeService = "com.docker.compose.service"
+)
+
+// configuration Contains information from the labels that are globals (not related to the dynamic configuration) or specific to the provider.
+type configuration struct {
+	Enable bool
+	Tags   []string
+	Docker specificConfiguration
+}
+
+type specificConfiguration struct {
+	Network string
+	LBSwarm bool
+}
+
+func (p *Provider) getConfiguration(container dockerData) (configuration, error) {
+	conf := configuration{
+		Enable: p.ExposedByDefault,
+		Docker: specificConfiguration{
+			Network: p.Network,
+		},
+	}
+
+	err := label.Decode(container.Labels, &conf, "traefik.docker.", "traefik.enable", "traefik.tags")
+	if err != nil {
+		return configuration{}, err
+	}
+
+	return conf, nil
+}
+
+// getStringMultipleStrict get multiple string values associated to several labels
+// Fail if one label is missing
+func getStringMultipleStrict(labels map[string]string, labelNames ...string) (map[string]string, error) {
+	foundLabels := map[string]string{}
+	for _, name := range labelNames {
+		value := getStringValue(labels, name, "")
+		// Error out only if one of them is not defined.
+		if len(value) == 0 {
+			return nil, fmt.Errorf("label not found: %s", name)
+		}
+		foundLabels[name] = value
+	}
+	return foundLabels, nil
+}
+
+// getStringValue get string value associated to a label
+func getStringValue(labels map[string]string, labelName string, defaultValue string) string {
+	if value, ok := labels[labelName]; ok && len(value) > 0 {
+		return value
+	}
+	return defaultValue
+}