// NewBackends creates a new backend from a raw config structure
func NewBackends(raw []interface{}, disc discovery.ServiceBackend) ([]*Backend, error) {
if raw == nil {
return []*Backend{}, nil
}
var backends []*Backend
if err := utils.DecodeRaw(raw, &backends); err != nil {
return nil, fmt.Errorf("Backend configuration error: %v", err)
}
for _, b := range backends {
if err := utils.ValidateServiceName(b.Name); err != nil {
return nil, err
}
if b.OnChangeExec == nil {
return nil, fmt.Errorf("`onChange` is required in backend %s",
b.Name)
}
cmd, err := commands.NewCommand(b.OnChangeExec, b.Timeout)
if err != nil {
return nil, fmt.Errorf("Could not parse `onChange` in backend %s: %s",
b.Name, err)
}
cmd.Name = fmt.Sprintf("%s.health", b.Name)
b.onChangeCmd = cmd
if b.Poll < 1 {
return nil, fmt.Errorf("`poll` must be > 0 in backend %s",
b.Name)
}
b.onChangeCmd = cmd
b.discoveryService = disc
}
return backends, nil
}
func parseService(s *Service, disc discovery.ServiceBackend) error {
if err := utils.ValidateServiceName(s.Name); err != nil {
return err
}
hostname, _ := os.Hostname()
s.ID = fmt.Sprintf("%s-%s", s.Name, hostname)
s.discoveryService = disc
if s.Poll < 1 {
return fmt.Errorf("`poll` must be > 0 in service %s", s.Name)
}
if s.TTL < 1 {
return fmt.Errorf("`ttl` must be > 0 in service %s", s.Name)
}
if s.Port < 1 {
return fmt.Errorf("`port` must be > 0 in service %s", s.Name)
}
// if the HealthCheckExec is nil then we'll have no health check
// command; this is useful for the telemetry service
cmd, err := utils.ParseCommandArgs(s.HealthCheckExec)
if err != nil {
return fmt.Errorf("Could not parse `health` in service %s: %s", s.Name, err)
}
s.healthCheckCmd = cmd
interfaces, ifaceErr := utils.ToStringArray(s.Interfaces)
if ifaceErr != nil {
return ifaceErr
}
ipAddress, err := utils.GetIP(interfaces)
if err != nil {
return err
}
s.IPAddress = ipAddress
s.definition = &discovery.ServiceDefinition{
ID: s.ID,
Name: s.Name,
Port: s.Port,
TTL: s.TTL,
Tags: s.Tags,
IPAddress: s.IPAddress,
}
return nil
}
func parseService(s *Service, disc discovery.ServiceBackend) error {
if err := utils.ValidateServiceName(s.Name); err != nil {
return err
}
hostname, _ := os.Hostname()
s.ID = fmt.Sprintf("%s-%s", s.Name, hostname)
s.discoveryService = disc
if s.Poll < 1 {
return fmt.Errorf("`poll` must be > 0 in service %s", s.Name)
}
if s.TTL < 1 {
return fmt.Errorf("`ttl` must be > 0 in service %s", s.Name)
}
if s.Port < 1 {
return fmt.Errorf("`port` must be > 0 in service %s", s.Name)
}
// if the HealthCheckExec is nil then we'll have no health check
// command; this is useful for the telemetry service
if s.HealthCheckExec != nil {
cmd, err := commands.NewCommand(s.HealthCheckExec, s.Timeout)
if err != nil {
return fmt.Errorf("Could not parse `health` in service %s: %s", s.Name, err)
}
cmd.Name = fmt.Sprintf("%s.health", s.Name)
s.healthCheckCmd = cmd
}
interfaces, ifaceErr := utils.ToStringArray(s.Interfaces)
if ifaceErr != nil {
return ifaceErr
}
ipAddress, err := utils.GetIP(interfaces)
if err != nil {
return err
}
s.IPAddress = ipAddress
var consulExtras *discovery.ConsulExtras
if s.ConsulConfig != nil {
if s.ConsulConfig.DeregisterCriticalServiceAfter != "" {
if _, err := time.ParseDuration(s.ConsulConfig.DeregisterCriticalServiceAfter); err != nil {
return fmt.Errorf("Could not parse consul `deregisterCriticalServiceAfter` in service %s: %s", s.Name, err)
}
}
consulExtras = &discovery.ConsulExtras{
DeregisterCriticalServiceAfter: s.ConsulConfig.DeregisterCriticalServiceAfter,
EnableTagOverride: s.ConsulConfig.EnableTagOverride,
}
}
s.definition = &discovery.ServiceDefinition{
ID: s.ID,
Name: s.Name,
Port: s.Port,
TTL: s.TTL,
Tags: s.Tags,
IPAddress: s.IPAddress,
ConsulExtras: consulExtras,
}
return nil
}