mirror of
https://github.com/cgrates/cgrates.git
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145 lines
3.7 KiB
Go
145 lines
3.7 KiB
Go
/*
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Real-time Online/Offline Charging System (OCS) for Telecom & ISP environments
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Copyright (C) ITsysCOM GmbH
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>
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*/
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package services
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import (
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"sync"
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"github.com/cgrates/cgrates/agents"
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"github.com/cgrates/cgrates/config"
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"github.com/cgrates/cgrates/servmanager"
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"github.com/cgrates/cgrates/utils"
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)
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// NewDNSAgent returns the DNS Agent
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func NewDNSAgent(cfg *config.CGRConfig) *DNSAgent {
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return &DNSAgent{
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cfg: cfg,
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stateDeps: NewStateDependencies([]string{utils.StateServiceUP, utils.StateServiceDOWN}),
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}
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}
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// DNSAgent implements Agent interface
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type DNSAgent struct {
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mu sync.RWMutex
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cfg *config.CGRConfig
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stopChan chan struct{}
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dns *agents.DNSAgent
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stateDeps *StateDependencies // channel subscriptions for state changes
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}
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// Start should handle the service start
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func (dns *DNSAgent) Start(shutdown *utils.SyncedChan, registry *servmanager.ServiceRegistry) (err error) {
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srvDeps, err := WaitForServicesToReachState(utils.StateServiceUP,
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[]string{
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utils.ConnManager,
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utils.FilterS,
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},
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registry, dns.cfg.GeneralCfg().ConnectTimeout)
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if err != nil {
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return err
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}
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cms := srvDeps[utils.ConnManager].(*ConnManagerService)
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fs := srvDeps[utils.FilterS].(*FilterService)
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dns.mu.Lock()
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defer dns.mu.Unlock()
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dns.dns, err = agents.NewDNSAgent(dns.cfg, fs.FilterS(), cms.ConnManager())
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if err != nil {
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dns.dns = nil
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return
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}
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dns.stopChan = make(chan struct{})
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go dns.listenAndServe(dns.stopChan, shutdown)
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return
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}
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// Reload handles the change of config
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func (dns *DNSAgent) Reload(shutdown *utils.SyncedChan, registry *servmanager.ServiceRegistry) (err error) {
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srvDeps, err := WaitForServicesToReachState(utils.StateServiceUP,
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[]string{
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utils.ConnManager,
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utils.FilterS,
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},
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registry, dns.cfg.GeneralCfg().ConnectTimeout)
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if err != nil {
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return err
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}
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cms := srvDeps[utils.ConnManager].(*ConnManagerService)
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fs := srvDeps[utils.FilterS].(*FilterService)
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dns.mu.Lock()
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defer dns.mu.Unlock()
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if dns.dns != nil {
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close(dns.stopChan)
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}
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dns.dns, err = agents.NewDNSAgent(dns.cfg, fs.FilterS(), cms.ConnManager())
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if err != nil {
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dns.dns = nil
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return
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}
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dns.dns.Lock()
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defer dns.dns.Unlock()
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dns.stopChan = make(chan struct{})
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go dns.listenAndServe(dns.stopChan, shutdown)
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return
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}
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func (dns *DNSAgent) listenAndServe(stopChan chan struct{}, shutdown *utils.SyncedChan) (err error) {
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dns.dns.RLock()
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defer dns.dns.RUnlock()
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if err = dns.dns.ListenAndServe(stopChan); err != nil {
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shutdown.CloseOnce() // stop the engine here
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}
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return
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}
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// Shutdown stops the service
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func (dns *DNSAgent) Shutdown(_ *servmanager.ServiceRegistry) (err error) {
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if dns.dns == nil {
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return
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}
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close(dns.stopChan)
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dns.mu.Lock()
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defer dns.mu.Unlock()
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dns.dns = nil
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return
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}
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// ServiceName returns the service name
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func (dns *DNSAgent) ServiceName() string {
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return utils.DNSAgent
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}
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// ShouldRun returns if the service should be running
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func (dns *DNSAgent) ShouldRun() bool {
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return dns.cfg.DNSAgentCfg().Enabled
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}
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// StateChan returns signaling channel of specific state
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func (dns *DNSAgent) StateChan(stateID string) chan struct{} {
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return dns.stateDeps.StateChan(stateID)
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}
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