refactor(eureka): rewrite configuration system.

provider/eureka/config.go

@@ -0,0 +1,69 @@
+package eureka
+
+import (
+	"io/ioutil"
+	"strconv"
+	"text/template"
+
+	"github.com/ArthurHlt/go-eureka-client/eureka"
+	"github.com/containous/traefik/log"
+	"github.com/containous/traefik/provider"
+	"github.com/containous/traefik/provider/label"
+	"github.com/containous/traefik/types"
+)
+
+// Build the configuration from Provider server
+func (p *Provider) buildConfiguration() (*types.Configuration, error) {
+	var EurekaFuncMap = template.FuncMap{
+		"getPort":       getPort,
+		"getProtocol":   getProtocol,
+		"getWeight":     getWeight,
+		"getInstanceID": getInstanceID,
+	}
+
+	eureka.GetLogger().SetOutput(ioutil.Discard)
+
+	client := eureka.NewClient([]string{
+		p.Endpoint,
+	})
+
+	applications, err := client.GetApplications()
+	if err != nil {
+		return nil, err
+	}
+
+	templateObjects := struct {
+		Applications []eureka.Application
+	}{
+		applications.Applications,
+	}
+
+	configuration, err := p.GetConfiguration("templates/eureka.tmpl", EurekaFuncMap, templateObjects)
+	if err != nil {
+		log.Error(err)
+	}
+	return configuration, nil
+}
+
+func getInstanceID(instance eureka.InstanceInfo) string {
+	defaultID := provider.Normalize(instance.IpAddr) + "-" + getPort(instance)
+	return label.GetStringValue(instance.Metadata.Map, label.TraefikBackendID, defaultID)
+}
+
+func getPort(instance eureka.InstanceInfo) string {
+	if instance.SecurePort.Enabled {
+		return strconv.Itoa(instance.SecurePort.Port)
+	}
+	return strconv.Itoa(instance.Port.Port)
+}
+
+func getProtocol(instance eureka.InstanceInfo) string {
+	if instance.SecurePort.Enabled {
+		return "https"
+	}
+	return label.DefaultProtocol
+}
+
+func getWeight(instance eureka.InstanceInfo) string {
+	return label.GetStringValue(instance.Metadata.Map, label.TraefikWeight, label.DefaultWeight)
+}