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"
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"github.com/BurntSushi/ty/fun"
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)
type MarathonProvider struct {
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Watch bool
Endpoint string
marathonClient marathon.Marathon
Domain string
Filename string
NetworkInterface string
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}
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 {
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if (key == "traefik.host") {
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return value
}
}
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return strings.Replace(application.ID, "/", "", 1)
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},
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"getWeight": func(application marathon.Application) string {
for key, value := range application.Labels {
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if (key == "traefik.weight") {
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return value
}
}
return "0"
},
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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 = provider.NetworkInterface
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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
}
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tasks, err := provider.marathonClient.AllTasks()
if (err != nil) {
log.Println("Failed to create a client for marathon, error: %s", err)
return nil
}
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//filter tasks
filteredTasks := fun.Filter(func(task marathon.Task) bool {
if (len(task.Ports) == 0) {
log.Println("Filtering marathon task without port", task.AppID)
return false
}
application := getApplication(task, applications.Apps)
_, err := strconv.Atoi(application.Labels["traefik.port"])
if (len(application.Ports) > 1 && err != nil) {
log.Println("Filtering marathon task with more than 1 port and no traefik.port label", task.AppID)
return false
}
if (application.Labels["traefik.enable"] == "false") {
log.Println("Filtering disabled marathon task", task.AppID)
return false
}
return true
}, tasks.Tasks).([]marathon.Task)
//filter apps
filteredApps := fun.Filter(func(app marathon.Application) bool {
//get ports from app tasks
if (!fun.Exists(func(task marathon.Task) bool {
if (task.AppID == app.ID) {
return true
}
return false
}, filteredTasks)) {
return false
}
return true
}, applications.Apps).([]marathon.Application)
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templateObjects := struct {
Applications []marathon.Application
Tasks []marathon.Task
Domain string
}{
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filteredApps,
filteredTasks,
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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
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}
func getApplication(task marathon.Task, apps []marathon.Application) *marathon.Application {
for _, application := range apps {
if (application.ID == task.AppID) {
return &application
}
}
return nil
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}