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servmanager.go
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servmanager.go
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/*
Real-time Online/Offline Charging System (OCS) for Telecom & ISP environments
Copyright (C) ITsysCOM GmbH
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>
*/
package servmanager
import (
"errors"
"fmt"
"reflect"
"strings"
"sync"
"github.com/cgrates/birpc/context"
"github.com/cgrates/cgrates/config"
"github.com/cgrates/cgrates/engine"
"github.com/cgrates/cgrates/utils"
"github.com/cgrates/rpcclient"
)
// NewServiceManager returns a service manager
func NewServiceManager(cfg *config.CGRConfig, engineShutdown chan bool) *ServiceManager {
sm := &ServiceManager{
cfg: cfg,
engineShutdown: engineShutdown,
subsystems: make(map[string]Service),
}
return sm
}
// ServiceManager handles service management ran by the engine
type ServiceManager struct {
sync.RWMutex // lock access to any shared data
cfg *config.CGRConfig
engineShutdown chan bool
subsystems map[string]Service
}
func (srvMngr *ServiceManager) Call(ctx *context.Context, serviceMethod string, args any, reply any) error {
parts := strings.Split(serviceMethod, ".")
if len(parts) != 2 {
return rpcclient.ErrUnsupporteServiceMethod
}
// get method
method := reflect.ValueOf(srvMngr).MethodByName(parts[0][len(parts[0])-2:] + parts[1]) // Inherit the version in the method
if !method.IsValid() {
return rpcclient.ErrUnsupporteServiceMethod
}
// construct the params
params := []reflect.Value{reflect.ValueOf(args), reflect.ValueOf(reply)}
ret := method.Call(params)
if len(ret) != 1 {
return utils.ErrServerError
}
if ret[0].Interface() == nil {
return nil
}
err, ok := ret[0].Interface().(error)
if !ok {
return utils.ErrServerError
}
return err
}
// ArgStartService are passed to Start/StopService/Status RPC methods
type ArgStartService struct {
ServiceID string
}
// V1StartService starts a service with ID
func (srvMngr *ServiceManager) V1StartService(args ArgStartService, reply *string) (err error) {
switch args.ServiceID {
case utils.MetaScheduler:
// stop the service using the config
srvMngr.Lock()
srvMngr.cfg.SchedulerCfg().Enabled = true
srvMngr.Unlock()
srvMngr.cfg.GetReloadChan(config.SCHEDULER_JSN) <- struct{}{}
default:
err = errors.New(utils.UnsupportedServiceIDCaps)
}
if err != nil {
return err
}
*reply = utils.OK
return
}
// V1StopService shuts-down a service with ID
func (srvMngr *ServiceManager) V1StopService(args ArgStartService, reply *string) (err error) {
switch args.ServiceID {
case utils.MetaScheduler:
// stop the service using the config
srvMngr.Lock()
srvMngr.cfg.SchedulerCfg().Enabled = false
srvMngr.Unlock()
srvMngr.cfg.GetReloadChan(config.SCHEDULER_JSN) <- struct{}{}
default:
err = errors.New(utils.UnsupportedServiceIDCaps)
}
if err != nil {
return err
}
*reply = utils.OK
return
}
// V1ServiceStatus returns the service status
func (srvMngr *ServiceManager) V1ServiceStatus(args ArgStartService, reply *string) error {
srvMngr.RLock()
defer srvMngr.RUnlock()
var running bool
switch args.ServiceID {
case utils.MetaScheduler:
running = srvMngr.subsystems[utils.SchedulerS].IsRunning()
default:
return errors.New(utils.UnsupportedServiceIDCaps)
}
if running {
*reply = utils.RunningCaps
} else {
*reply = utils.StoppedCaps
}
return nil
}
// GetConfig returns the Configuration
func (srvMngr *ServiceManager) GetConfig() *config.CGRConfig {
srvMngr.RLock()
defer srvMngr.RUnlock()
return srvMngr.cfg
}
// StartServices starts all enabled services
func (srvMngr *ServiceManager) StartServices() (err error) {
go srvMngr.handleReload()
for _, service := range srvMngr.subsystems {
if service.ShouldRun() && !service.IsRunning() {
go func(srv Service) {
if err := srv.Start(); err != nil {
if err == utils.ErrServiceAlreadyRunning { // in case the service was started in another gorutine
return
}
utils.Logger.Err(fmt.Sprintf("<%s> failed to start %s because: %s", utils.ServiceManager, srv.ServiceName(), err))
srvMngr.engineShutdown <- true
}
}(service)
}
}
// startServer()
return
}
// AddServices adds given services
func (srvMngr *ServiceManager) AddServices(services ...Service) {
srvMngr.Lock()
for _, srv := range services {
if _, has := srvMngr.subsystems[srv.ServiceName()]; has { // do not rewrite the service
continue
}
srvMngr.subsystems[srv.ServiceName()] = srv
}
srvMngr.Unlock()
}
func (srvMngr *ServiceManager) handleReload() {
var err error
for {
select {
case ext := <-srvMngr.engineShutdown:
srvMngr.engineShutdown <- ext
for srviceName, srv := range srvMngr.subsystems { // gracefully stop all running subsystems
if !srv.IsRunning() {
continue
}
if err := srv.Shutdown(); err != nil {
utils.Logger.Err(fmt.Sprintf("<%s> Failed to shutdown subsystem <%s> because: %s",
utils.ServiceManager, srviceName, err))
}
}
return
case <-srvMngr.GetConfig().GetReloadChan(config.ATTRIBUTE_JSN):
if err = srvMngr.reloadService(utils.AttributeS); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.ChargerSCfgJson):
if err = srvMngr.reloadService(utils.ChargerS); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.THRESHOLDS_JSON):
if err = srvMngr.reloadService(utils.ThresholdS); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.STATS_JSON):
if err = srvMngr.reloadService(utils.StatS); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.RESOURCES_JSON):
if err = srvMngr.reloadService(utils.ResourceS); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.SupplierSJson):
if err = srvMngr.reloadService(utils.SupplierS); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.SCHEDULER_JSN):
if err = srvMngr.reloadService(utils.SchedulerS); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.RALS_JSN):
if err = srvMngr.reloadService(utils.RALService); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.ApierS):
if err = srvMngr.reloadService(utils.APIerSv1); err != nil {
return
}
if err = srvMngr.reloadService(utils.APIerSv2); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.CDRS_JSN):
if err = srvMngr.reloadService(utils.CDRServer); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.SessionSJson):
if err = srvMngr.reloadService(utils.SessionS); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.ERsJson):
if err = srvMngr.reloadService(utils.ERs); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.DNSAgentJson):
if err = srvMngr.reloadService(utils.DNSAgent); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.FreeSWITCHAgentJSN):
if err = srvMngr.reloadService(utils.FreeSWITCHAgent); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.KamailioAgentJSN):
if err = srvMngr.reloadService(utils.KamailioAgent); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.AsteriskAgentJSN):
if err = srvMngr.reloadService(utils.AsteriskAgent); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.RA_JSN):
if err = srvMngr.reloadService(utils.RadiusAgent); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.DA_JSN):
if err = srvMngr.reloadService(utils.DiameterAgent); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.HttpAgentJson):
if err = srvMngr.reloadService(utils.HTTPAgent); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.LoaderJson):
if err = srvMngr.reloadService(utils.LoaderS); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.AnalyzerCfgJson):
if err = srvMngr.reloadService(utils.AnalyzerS); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.DispatcherSJson):
if err = srvMngr.reloadService(utils.DispatcherS); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.DATADB_JSN):
if err = srvMngr.reloadService(utils.DataDB); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.STORDB_JSN):
if err = srvMngr.reloadService(utils.StorDB); err != nil {
return
}
case <-srvMngr.GetConfig().GetReloadChan(config.RPCConnsJsonName):
engine.Cache.Clear([]string{utils.CacheRPCConnections})
}
// handle RPC server
}
}
func (srvMngr *ServiceManager) reloadService(srviceName string) (err error) {
srv := srvMngr.GetService(srviceName)
if srv.ShouldRun() {
if srv.IsRunning() {
if err = srv.Reload(); err != nil {
utils.Logger.Err(fmt.Sprintf("<%s> failed to reload <%s> err <%s>", utils.ServiceManager, srv.ServiceName(), err))
srvMngr.engineShutdown <- true
return // stop if we encounter an error
}
} else {
if err = srv.Start(); err != nil {
utils.Logger.Err(fmt.Sprintf("<%s> failed to start <%s> err <%s>", utils.ServiceManager, srv.ServiceName(), err))
srvMngr.engineShutdown <- true
return // stop if we encounter an error
}
}
} else if srv.IsRunning() {
if err = srv.Shutdown(); err != nil {
utils.Logger.Err(fmt.Sprintf("<%s> failed to stop service <%s> err <%s>", utils.ServiceManager, srv.ServiceName(), err))
srvMngr.engineShutdown <- true
return // stop if we encounter an error
}
}
return
}
// GetService returns the named service
func (srvMngr *ServiceManager) GetService(subsystem string) (srv Service) {
var has bool
srvMngr.RLock()
srv, has = srvMngr.subsystems[subsystem]
srvMngr.RUnlock()
if !has { // this should not happen (check the added services)
panic(fmt.Sprintf("<%s> Failed to find needed subsystem <%s>",
utils.ServiceManager, subsystem)) // because this is not dinamic this should not happen
}
return
}
// Service interface that describes what functions should a service implement
type Service interface {
// Start should handle the sercive start
Start() error
// Reload handles the change of config
Reload() error
// Shutdown stops the service
Shutdown() error
// IsRunning returns if the service is running
IsRunning() bool
// ShouldRun returns if the service should be running
ShouldRun() bool
// ServiceName returns the service name
ServiceName() string
}