traefik/marathon.go

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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
}
}
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return strings.Replace(application.ID, "/", "", 1)
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},
"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
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config.EventsInterface = "docker0"
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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
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update := make(marathon.EventsChannel, 5)
if (provider.Watch) {
if err := client.AddEventsListener(update, marathon.EVENTS_APPLICATIONS); err != nil {
log.Println("Failed to register for subscriptions, %s", err)
} else {
go func() {
for {
event := <-update
log.Println("Marathon event receveived", event)
configuration := provider.loadMarathonConfig()
if (configuration != nil) {
configurationChan <- configuration
}
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}
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}()
}
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}
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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
}
return configuration
}