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traefik/provider/eureka.go

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2016-08-31 23:43:05 +03:00
package provider
import (
"github.com/ArthurHlt/go-eureka-client/eureka"
log "github.com/Sirupsen/logrus"
"github.com/cenk/backoff"
"github.com/containous/traefik/job"
"github.com/containous/traefik/safe"
"github.com/containous/traefik/types"
"io/ioutil"
"strconv"
"strings"
"text/template"
"time"
)
// Eureka holds configuration of the Eureka provider.
type Eureka struct {
BaseProvider `mapstructure:",squash"`
Endpoint string
Delay string
}
// Provide allows the provider to provide configurations to traefik
// using the given configuration channel.
func (provider *Eureka) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, _ []types.Constraint) error {
operation := func() error {
configuration, err := provider.buildConfiguration()
if err != nil {
log.Errorf("Failed to build configuration for Eureka, error: %s", err)
return err
}
configurationChan <- types.ConfigMessage{
ProviderName: "eureka",
Configuration: configuration,
}
var delay time.Duration
if len(provider.Delay) > 0 {
var err error
delay, err = time.ParseDuration(provider.Delay)
if err != nil {
log.Errorf("Failed to parse delay for Eureka, error: %s", err)
return err
}
} else {
delay = time.Second * 30
}
ticker := time.NewTicker(delay)
go func() {
for t := range ticker.C {
log.Debug("Refreshing Eureka " + t.String())
configuration, err := provider.buildConfiguration()
if err != nil {
log.Errorf("Failed to refresh Eureka configuration, error: %s", err)
return
}
configurationChan <- types.ConfigMessage{
ProviderName: "eureka",
Configuration: configuration,
}
}
}()
return nil
}
notify := func(err error, time time.Duration) {
log.Errorf("Eureka connection error %+v, retrying in %s", err, time)
}
err := backoff.RetryNotify(operation, job.NewBackOff(backoff.NewExponentialBackOff()), notify)
if err != nil {
log.Errorf("Cannot connect to Eureka server %+v", err)
return err
}
return nil
}
// Build the configuration from Eureka server
func (provider *Eureka) buildConfiguration() (*types.Configuration, error) {
var EurekaFuncMap = template.FuncMap{
"replace": replace,
"tolower": strings.ToLower,
"getPort": provider.getPort,
"getProtocol": provider.getProtocol,
"getWeight": provider.getWeight,
"getInstanceID": provider.getInstanceID,
}
eureka.GetLogger().SetOutput(ioutil.Discard)
client := eureka.NewClient([]string{
provider.Endpoint,
})
applications, err := client.GetApplications()
if err != nil {
return nil, err
}
templateObjects := struct {
Applications []eureka.Application
}{
applications.Applications,
}
configuration, err := provider.getConfiguration("templates/eureka.tmpl", EurekaFuncMap, templateObjects)
if err != nil {
log.Error(err)
}
return configuration, nil
}
func (provider *Eureka) getPort(instance eureka.InstanceInfo) string {
if instance.SecurePort.Enabled {
return strconv.Itoa(instance.SecurePort.Port)
}
return strconv.Itoa(instance.Port.Port)
}
func (provider *Eureka) getProtocol(instance eureka.InstanceInfo) string {
if instance.SecurePort.Enabled {
return "https"
}
return "http"
}
func (provider *Eureka) getWeight(instance eureka.InstanceInfo) string {
if val, ok := instance.Metadata.Map["traefik.weight"]; ok {
return val
}
return "0"
}
func (provider *Eureka) getInstanceID(instance eureka.InstanceInfo) string {
if val, ok := instance.Metadata.Map["traefik.backend.id"]; ok {
return val
}
return strings.Replace(instance.IpAddr, ".", "-", -1) + "-" + provider.getPort(instance)
}