Marathon provider

marathon.go

@@ -0,0 +1,100 @@
+package main
+import (
+	"github.com/gambol99/go-marathon"
+	"log"
+	"github.com/leekchan/gtf"
+	"bytes"
+	"github.com/BurntSushi/toml"
+	"text/template"
+	"strings"
+	"strconv"
+)
+
+type MarathonProvider struct {
+	Watch          bool
+	Endpoint       string
+	marathonClient marathon.Marathon
+	Domain         string
+	Filename       string
+}
+
+var MarathonFuncMap = template.FuncMap{
+	"getPort": func(task marathon.Task) string {
+		for _, port := range task.Ports {
+			return strconv.Itoa(port)
+		}
+		return ""
+	},
+	"getHost": func(application marathon.Application) string {
+		for key, value := range application.Labels {
+			if (key == "træfik.host") {
+				return value
+			}
+		}
+		return strings.TrimPrefix(application.ID, "/")
+	},
+	"replace": func(s1 string, s2 string, s3 string) string {
+		return strings.Replace(s3, s1, s2, -1)
+	},
+}
+func (provider *MarathonProvider) Provide(configurationChan chan <- *Configuration) {
+	config := marathon.NewDefaultConfig()
+	config.URL = provider.Endpoint
+	if client, err := marathon.NewClient(config); err != nil {
+		log.Println("Failed to create a client for marathon, error: %s", err)
+		return
+	} else {
+		provider.marathonClient = client
+		configuration := provider.loadMarathonConfig()
+		configurationChan <- configuration
+	}
+}
+
+func (provider *MarathonProvider) loadMarathonConfig() *Configuration {
+	configuration := new(Configuration)
+
+	applications, err := provider.marathonClient.Applications(nil)
+	if (err != nil) {
+		log.Println("Failed to create a client for marathon, error: %s", err)
+		return nil
+	}
+	tasks, err := provider.marathonClient.AllTasks()
+	if (err != nil) {
+		log.Println("Failed to create a client for marathon, error: %s", err)
+		return nil
+	}
+
+	templateObjects := struct {
+		Applications []marathon.Application
+		Tasks        []marathon.Task
+		Domain       string
+	}{
+		applications.Apps,
+		tasks.Tasks,
+		provider.Domain,
+	}
+
+	gtf.Inject(MarathonFuncMap)
+	tmpl, err := template.New(provider.Filename).Funcs(MarathonFuncMap).ParseFiles(provider.Filename)
+	if err != nil {
+		log.Println("Error reading file:", err)
+		return nil
+	}
+
+	var buffer bytes.Buffer
+
+	err = tmpl.Execute(&buffer, templateObjects)
+	if err != nil {
+		log.Println("Error with docker template:", err)
+		return nil
+	}
+
+	if _, err := toml.Decode(buffer.String(), configuration); err != nil {
+		log.Println("Error creating marathon configuration:", err)
+		return nil
+	}
+
+	log.Println(buffer.String())
+
+	return configuration
+}