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service.go
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service.go
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package discovery
import (
"fmt"
"github.com/hashicorp/consul/api"
log "github.com/sirupsen/logrus"
)
// ServiceDefinition is how a job communicates with the Consul service
// discovery backend.
type ServiceDefinition struct {
ID string
Name string
Port int
TTL int
Tags []string
IPAddress string
EnableTagOverride bool
DeregisterCriticalServiceAfter string
Consul Backend
wasRegistered bool
}
// Deregister removes the service from Consul.
func (service *ServiceDefinition) Deregister() {
service.MarkForMaintenance()
}
// MarkForMaintenance removes the service from Consul.
func (service *ServiceDefinition) MarkForMaintenance() {
log.Debugf("deregistering: %s", service.ID)
if err := service.Consul.ServiceDeregister(service.ID); err != nil {
log.Infof("deregistering failed: %s", err)
}
}
// SendHeartbeat writes a TTL check status=ok to the consul store.
// If consul has never seen this service, we register the service and
// its TTL check.
func (service *ServiceDefinition) SendHeartbeat() error {
if !service.wasRegistered {
if err := service.registerService(); err != nil {
log.Warnf("service registration failed: %s", err)
return err
}
service.wasRegistered = true
return nil
}
checkID := fmt.Sprintf("service:%s", service.ID)
if err := service.Consul.PassTTL(checkID, "ok"); err != nil {
log.Infof("service not registered: %v", err)
if err = service.registerService(); err != nil {
log.Warnf("service registration failed: %s", err)
return err
}
log.Infof("Service registered: %v", service.Name)
}
return nil
}
// registers the service along with a check set to the passing state
func (service *ServiceDefinition) registerService() error {
return service.Consul.ServiceRegister(
&api.AgentServiceRegistration{
ID: service.ID,
Name: service.Name,
Tags: service.Tags,
Port: service.Port,
Address: service.IPAddress,
EnableTagOverride: service.EnableTagOverride,
Check: &api.AgentServiceCheck{
TTL: fmt.Sprintf("%ds", service.TTL),
Status: api.HealthPassing,
Notes: fmt.Sprintf("TTL for %s set by containerpilot", service.Name),
DeregisterCriticalServiceAfter: service.DeregisterCriticalServiceAfter,
},
},
)
}