func leader(hc *http.Client, masters []string) (types.Host, error) {
var host types.Host
master := utils.PickRandomFromList(masters)
leaderId, err := query(hc, master)
if err != nil {
return host, err
}
return parseLeader(leaderId)
}
// Queries a Marathon master to receive running applications and tasks and generates a list of services.
func (g *Generator) Generate() ([]*types.Service, error) {
var apps Apps
var tasks Tasks
server := utils.PickRandomFromList(g.marathonServers)
log.AppLog.Debug("Querying Marathon server at '%s'", server)
req, _ := http.NewRequest("GET", fmt.Sprintf("%s%s", server, appsEndpoint), nil)
req.Header.Add("Accept", "application/json")
resp, err := g.httpClient.Do(req)
if err != nil {
return []*types.Service{}, err
}
defer resp.Body.Close()
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return []*types.Service{}, err
}
err = json.Unmarshal(data, &apps)
if err != nil {
return []*types.Service{}, err
}
req, _ = http.NewRequest("GET", fmt.Sprintf("%s%s", server, tasksEndpoint), nil)
req.Header.Add("Accept", "application/json")
resp, err = g.httpClient.Do(req)
if err != nil {
return []*types.Service{}, err
}
defer resp.Body.Close()
data, err = ioutil.ReadAll(resp.Body)
if err != nil {
return []*types.Service{}, err
}
err = json.Unmarshal(data, &tasks)
if err != nil {
return []*types.Service{}, err
}
return g.servicesFromMarathon(apps, tasks), nil
}