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traefik/provider/eureka/eureka.go
2017-12-05 19:40:04 +01:00

80 lines
2.1 KiB
Go

package eureka
import (
"time"
"github.com/cenk/backoff"
"github.com/containous/traefik/job"
"github.com/containous/traefik/log"
"github.com/containous/traefik/provider"
"github.com/containous/traefik/safe"
"github.com/containous/traefik/types"
)
// Provider holds configuration of the Provider provider.
type Provider struct {
provider.BaseProvider `mapstructure:",squash" export:"true"`
Endpoint string `description:"Eureka server endpoint"`
Delay string `description:"Override default configuration time between refresh" export:"true"`
}
// Provide allows the eureka provider to provide configurations to traefik
// using the given configuration channel.
func (p *Provider) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, _ types.Constraints) error {
operation := func() error {
configuration, err := p.buildConfiguration()
if err != nil {
log.Errorf("Failed to build configuration for Provider, error: %s", err)
return err
}
configurationChan <- types.ConfigMessage{
ProviderName: "eureka",
Configuration: configuration,
}
var delay time.Duration
if len(p.Delay) > 0 {
var err error
delay, err = time.ParseDuration(p.Delay)
if err != nil {
log.Errorf("Failed to parse delay for Provider, error: %s", err)
return err
}
} else {
delay = time.Second * 30
}
ticker := time.NewTicker(delay)
safe.Go(func() {
for t := range ticker.C {
log.Debugf("Refreshing Provider %s", t.String())
configuration, err := p.buildConfiguration()
if err != nil {
log.Errorf("Failed to refresh Provider configuration, error: %s", err)
return
}
configurationChan <- types.ConfigMessage{
ProviderName: "eureka",
Configuration: configuration,
}
}
})
return nil
}
notify := func(err error, time time.Duration) {
log.Errorf("Provider 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 Provider server %+v", err)
return err
}
return nil
}