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service.go
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service.go
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package clusterf
/*
* Internal service state, maintained from config changes.
*/
import (
"github.com/qmsk/clusterf/config"
"log"
)
type Service struct {
Name string
Frontend *config.ServiceFrontend
Backends map[string]config.ServiceBackend
driverFrontend *ipvsFrontend
driverBackends map[string]*ipvsBackend
}
func newService(name string) *Service {
return &Service{
Name: name,
Backends: make(map[string]config.ServiceBackend),
driverBackends: make(map[string]*ipvsBackend),
}
}
func (self *Service) driverError(err error) {
log.Printf("cluster:Service %s: Error: %s\n", self.Name, err)
}
/* Configuration actions */
func (self *Service) configFrontend(action config.Action, frontendConfig *config.ConfigServiceFrontend) {
frontend := frontendConfig.Frontend
log.Printf("clusterf:Service %s: Frontend: %s %+v <- %+v\n", self.Name, action, frontend, self.Frontend)
switch action {
case config.NewConfig:
self.Frontend = &frontend
case config.SetConfig:
if self.Frontend == nil {
self.newFrontend(frontend)
} else if *self.Frontend != frontend {
self.setFrontend(frontend)
}
self.Frontend = &frontend
case config.DelConfig:
self.delFrontend()
self.Frontend = nil
}
}
func (self *Service) configBackend(backendName string, action config.Action, backendConfig *config.ConfigServiceBackend) {
log.Printf("clusterf:Service %s: Backend %s: %s %+v <- %+v\n", self.Name, backendName, action, backendConfig.Backend, self.Backends[backendName])
switch action {
case config.NewConfig:
self.Backends[backendName] = backendConfig.Backend
case config.SetConfig:
if self.Backends[backendName] == backendConfig.Backend {
return
}
if self.Frontend != nil {
self.setBackend(backendName, backendConfig.Backend)
}
self.Backends[backendName] = backendConfig.Backend
case config.DelConfig:
if self.Frontend != nil {
self.delBackend(backendName)
}
delete(self.Backends, backendName)
}
}
// Synchronize state to IPVS
func (self *Service) sync(driver *IPVSDriver) {
self.driverFrontend = driver.newFrontend()
if self.Frontend != nil {
// also adds backends
self.newFrontend(*self.Frontend)
}
}
/* Frontend actions */
func (self *Service) newFrontend(frontend config.ServiceFrontend) {
log.Printf("clusterf:Service %s: new Frontend: %+v\n", self.Name, frontend)
if err := self.driverFrontend.add(frontend); err != nil {
self.driverError(err)
}
for backendName, backend := range self.Backends {
self.newBackend(backendName, backend)
}
}
func (self *Service) setFrontend(frontend config.ServiceFrontend) {
log.Printf("clusterf:Service %s: set Frontend: %+v\n", self.Name, frontend)
if self.Frontend != nil {
// TODO: smoother setup-before-teardown transition..?
self.delFrontend()
}
self.newFrontend(frontend)
}
func (self *Service) delFrontend() {
log.Printf("clusterf:Service %s: del Frontend: %+v\n", self.Name, self.Frontend)
// del'ing the frontend will also remove all backend state
if err := self.driverFrontend.del(); err != nil {
self.driverError(err)
}
// clear backend state
for backendName, _ := range self.driverBackends {
delete(self.driverBackends, backendName)
}
}
/* Backend actions */
func (self *Service) newBackend(backendName string, backend config.ServiceBackend) {
log.Printf("clusterf:Service %s: new Backend %s: %+v\n", self.Name, backendName, backend)
self.driverBackends[backendName] = self.driverFrontend.newBackend()
if err := self.driverBackends[backendName].add(backend); err != nil {
self.driverError(err)
}
}
func (self *Service) setBackend(backendName string, backend config.ServiceBackend) {
log.Printf("clusterf:Service %s: set Backend %s: %+v\n", self.Name, backendName, backend)
if driverBackend := self.driverBackends[backendName]; driverBackend == nil {
self.newBackend(backendName, backend)
} else if err := driverBackend.set(backend); err != nil {
self.driverError(err)
}
}
func (self *Service) delBackend(backendName string) {
log.Printf("clusterf:Service %s: del Backend %s: %+v\n", self.Name, backendName, self.Backends[backendName])
if err := self.driverBackends[backendName].del(); err != nil {
self.driverError(err)
}
delete(self.driverBackends, backendName)
}