mirror of
https://github.com/cgrates/cgrates.git
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303 lines
12 KiB
Go
303 lines
12 KiB
Go
/*
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Real-time Charging System 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 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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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package sessionmanager
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import (
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"errors"
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"fmt"
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"log/syslog"
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"time"
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"github.com/cgrates/cgrates/config"
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"github.com/cgrates/cgrates/engine"
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"github.com/cgrates/cgrates/utils"
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"github.com/cgrates/fsock"
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)
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// The freeswitch session manager type holding a buffer for the network connection
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// and the active sessions
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type FSSessionManager struct {
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cfg *config.SmFsConfig
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conns map[string]*fsock.FSock // Keep the list here for connection management purposes
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sessions []*Session
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rater engine.Connector
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cdrs engine.Connector
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cdrDb engine.CdrStorage
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}
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func NewFSSessionManager(smFsConfig *config.SmFsConfig, storage engine.CdrStorage, rater, cdrs engine.Connector) *FSSessionManager {
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return &FSSessionManager{cfg: smFsConfig, conns: make(map[string]*fsock.FSock), cdrDb: storage, rater: rater, cdrs: cdrs}
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}
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// Connects to the freeswitch mod_event_socket server and starts
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// listening for events.
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func (sm *FSSessionManager) Connect() error {
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eventFilters := map[string]string{"Call-Direction": "inbound"}
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errChan := make(chan error)
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for _, connCfg := range sm.cfg.Connections {
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connId := utils.GenUUID()
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fSock, err := fsock.NewFSock(connCfg.Server, connCfg.Password, connCfg.Reconnects, sm.createHandlers(), eventFilters, engine.Logger.(*syslog.Writer), connId)
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if err != nil {
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return err
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} else if !fSock.Connected() {
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return errors.New("Could not connect to FreeSWITCH")
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} else {
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sm.conns[connId] = fSock
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}
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go func() { // Start reading in own goroutine, return on error
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if err := sm.conns[connId].ReadEvents(); err != nil {
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errChan <- err
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}
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}()
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}
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err := <-errChan // Will keep the Connect locked until the first error in one of the connections
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return err
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}
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func (sm *FSSessionManager) createHandlers() (handlers map[string][]func(string, string)) {
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cp := func(body, connId string) {
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ev := new(FSEvent).AsEvent(body)
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sm.onChannelPark(ev, connId)
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}
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ca := func(body, connId string) {
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ev := new(FSEvent).AsEvent(body)
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sm.onChannelAnswer(ev, connId)
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}
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ch := func(body, connId string) {
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ev := new(FSEvent).AsEvent(body)
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sm.onChannelHangupComplete(ev)
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}
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return map[string][]func(string, string){
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"CHANNEL_PARK": []func(string, string){cp},
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"CHANNEL_ANSWER": []func(string, string){ca},
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"CHANNEL_HANGUP_COMPLETE": []func(string, string){ch},
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}
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}
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// Searches and return the session with the specifed uuid
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func (sm *FSSessionManager) GetSession(uuid string) *Session {
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for _, s := range sm.sessions {
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if s.eventStart.GetUUID() == uuid {
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return s
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}
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}
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return nil
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}
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// Disconnects a session by sending hangup command to freeswitch
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func (sm *FSSessionManager) DisconnectSession(ev engine.Event, connId, notify string) error {
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if _, err := sm.conns[connId].SendApiCmd(fmt.Sprintf("uuid_setvar %s cgr_notify %s\n\n", ev.GetUUID(), notify)); err != nil {
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engine.Logger.Err(fmt.Sprintf("<SM-FreeSWITCH> Could not send disconect api notification to freeswitch, error: <%s>, connId: %s", err.Error(), connId))
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return err
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}
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if notify == INSUFFICIENT_FUNDS {
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if len(sm.cfg.EmptyBalanceContext) != 0 {
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if _, err := sm.conns[connId].SendApiCmd(fmt.Sprintf("uuid_transfer %s %s %s\n\n", ev.GetUUID(), ev.GetCallDestNr(utils.META_DEFAULT), sm.cfg.EmptyBalanceContext)); err != nil {
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engine.Logger.Err(fmt.Sprintf("<SM-FreeSWITCH> Could not transfer the call to empty balance context, error: <%s>, connId: %s", err.Error(), connId))
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return err
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}
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return nil
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} else if len(sm.cfg.EmptyBalanceAnnFile) != 0 {
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if _, err := sm.conns[connId].SendApiCmd(fmt.Sprintf("uuid_broadcast %s playback!manager_request::%s aleg\n\n", ev.GetUUID(), sm.cfg.EmptyBalanceAnnFile)); err != nil {
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engine.Logger.Err(fmt.Sprintf("<SM-FreeSWITCH> Could not send uuid_broadcast to freeswitch, error: <%s>, connId: %s", err.Error(), connId))
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return err
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}
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return nil
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}
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}
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if err := sm.conns[connId].SendMsgCmd(ev.GetUUID(), map[string]string{"call-command": "hangup", "hangup-cause": "MANAGER_REQUEST"}); err != nil {
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engine.Logger.Err(fmt.Sprintf("<SM-FreeSWITCH> Could not send disconect msg to freeswitch, error: <%s>, connId: %s", err.Error(), connId))
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return err
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}
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return nil
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}
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// Remove session from session list, removes all related in case of multiple runs
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func (sm *FSSessionManager) RemoveSession(uuid string) {
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for i, ss := range sm.sessions {
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if ss.eventStart.GetUUID() == uuid {
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sm.sessions = append(sm.sessions[:i], sm.sessions[i+1:]...)
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return
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}
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}
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}
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// Sets the call timeout valid of starting of the call
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func (sm *FSSessionManager) setMaxCallDuration(uuid, connId string, maxDur time.Duration) error {
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// _, err := fsock.FS.SendApiCmd(fmt.Sprintf("sched_hangup +%d %s\n\n", int(maxDur.Seconds()), uuid))
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_, err := sm.conns[connId].SendApiCmd(fmt.Sprintf("uuid_setvar %s execute_on_answer sched_hangup +%d alloted_timeout\n\n", uuid, int(maxDur.Seconds())))
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if err != nil {
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engine.Logger.Err(fmt.Sprintf("<SM-FreeSWITCH> Could not send sched_hangup command to freeswitch, error: <%s>, connId: %s", err.Error(), connId))
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return err
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}
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return nil
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}
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// Queries LCR and sets the cgr_lcr channel variable
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func (sm *FSSessionManager) setCgrLcr(ev engine.Event, connId string) error {
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var lcrCost engine.LCRCost
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startTime, err := ev.GetSetupTime(utils.META_DEFAULT)
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if err != nil {
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return err
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}
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cd := &engine.CallDescriptor{
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Direction: ev.GetDirection(utils.META_DEFAULT),
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Tenant: ev.GetTenant(utils.META_DEFAULT),
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Category: ev.GetCategory(utils.META_DEFAULT),
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Subject: ev.GetSubject(utils.META_DEFAULT),
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Account: ev.GetAccount(utils.META_DEFAULT),
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Destination: ev.GetDestination(utils.META_DEFAULT),
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TimeStart: startTime,
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TimeEnd: startTime.Add(config.CgrConfig().MaxCallDuration),
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}
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if err := sm.rater.GetLCR(cd, &lcrCost); err != nil {
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return err
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}
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supps := []string{}
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for _, supplCost := range lcrCost.SupplierCosts {
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if dtcs, err := utils.NewDTCSFromRPKey(supplCost.Supplier); err != nil {
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return err
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} else if len(dtcs.Subject) != 0 {
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supps = append(supps, dtcs.Subject)
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}
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}
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fsArray := SliceAsFsArray(supps)
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if _, err = sm.conns[connId].SendApiCmd(fmt.Sprintf("uuid_setvar %s cgr_notify %s\n\n", ev.GetUUID(), fsArray)); err != nil {
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return err
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}
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return nil
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}
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// Sends the transfer command to unpark the call to freeswitch
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func (sm *FSSessionManager) unparkCall(uuid, connId, call_dest_nb, notify string) {
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_, err := sm.conns[connId].SendApiCmd(fmt.Sprintf("uuid_setvar %s cgr_notify %s\n\n", uuid, notify))
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if err != nil {
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engine.Logger.Err(fmt.Sprintf("<SM-FreeSWITCH> Could not send unpark api notification to freeswitch, error: <%s>, connId: %s", err.Error(), connId))
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}
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if _, err = sm.conns[connId].SendApiCmd(fmt.Sprintf("uuid_transfer %s %s\n\n", uuid, call_dest_nb)); err != nil {
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engine.Logger.Err(fmt.Sprintf("<SM-FreeSWITCH> Could not send unpark api call to freeswitch, error: <%s>, connId: %s", err.Error(), connId))
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}
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}
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func (sm *FSSessionManager) onChannelPark(ev engine.Event, connId string) {
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if ev.GetReqType(utils.META_DEFAULT) == utils.META_NONE { // Do not process this request
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return
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}
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var maxCallDuration float64 // This will be the maximum duration this channel will be allowed to last
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if err := sm.rater.GetDerivedMaxSessionTime(*ev.AsStoredCdr(), &maxCallDuration); err != nil {
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engine.Logger.Err(fmt.Sprintf("<SM-FreeSWITCH> Could not get max session time for %s, error: %s", ev.GetUUID(), err.Error()))
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}
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maxCallDur := time.Duration(maxCallDuration)
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if maxCallDur <= sm.cfg.MinCallDuration {
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//engine.Logger.Info(fmt.Sprintf("Not enough credit for trasferring the call %s for %s.", ev.GetUUID(), cd.GetKey(cd.Subject)))
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sm.unparkCall(ev.GetUUID(), connId, ev.GetCallDestNr(utils.META_DEFAULT), INSUFFICIENT_FUNDS)
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return
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}
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sm.setMaxCallDuration(ev.GetUUID(), connId, maxCallDur)
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if sm.cfg.ComputeLcr {
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if err := sm.setCgrLcr(ev, connId); err != nil {
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engine.Logger.Err(fmt.Sprintf("<SM-FreeSWITCH> Could not set LCR for %s, error: %s", ev.GetUUID(), err.Error()))
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sm.unparkCall(ev.GetUUID(), connId, ev.GetCallDestNr(utils.META_DEFAULT), SYSTEM_ERROR)
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return
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}
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}
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sm.unparkCall(ev.GetUUID(), connId, ev.GetCallDestNr(utils.META_DEFAULT), AUTH_OK)
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}
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func (sm *FSSessionManager) onChannelAnswer(ev engine.Event, connId string) {
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if ev.GetReqType(utils.META_DEFAULT) == utils.META_NONE { // Do not process this request
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return
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}
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if ev.MissingParameter() {
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sm.DisconnectSession(ev, connId, MISSING_PARAMETER)
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}
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s := NewSession(ev, connId, sm)
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if s != nil {
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sm.sessions = append(sm.sessions, s)
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}
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}
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func (sm *FSSessionManager) onChannelHangupComplete(ev engine.Event) {
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if ev.GetReqType(utils.META_DEFAULT) == utils.META_NONE { // Do not process this request
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return
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}
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if sm.cdrs != nil {
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go sm.ProcessCdr(ev.AsStoredCdr())
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}
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var s *Session
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for i := 0; i < 2; i++ { // Protect us against concurrency, wait a couple of seconds for the answer to be populated before we process hangup
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s = sm.GetSession(ev.GetUUID())
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if s != nil {
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break
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}
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time.Sleep(time.Duration(i+1) * time.Second)
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}
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if s == nil { // Not handled by us
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return
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}
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sm.RemoveSession(s.eventStart.GetUUID()) // Unreference it early so we avoid concurrency
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if err := s.Close(ev); err != nil { // Stop loop, refund advanced charges and save the costs deducted so far to database
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engine.Logger.Err(err.Error())
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}
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}
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func (sm *FSSessionManager) ProcessCdr(storedCdr *engine.StoredCdr) error {
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var reply string
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if err := sm.cdrs.ProcessCdr(storedCdr, &reply); err != nil {
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engine.Logger.Err(fmt.Sprintf("<SM-FreeSWITCH> Failed processing CDR, cgrid: %s, accid: %s, error: <%s>", storedCdr.CgrId, storedCdr.AccId, err.Error()))
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}
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return nil
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}
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func (sm *FSSessionManager) DebitInterval() time.Duration {
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return sm.cfg.DebitInterval
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}
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func (sm *FSSessionManager) CdrDb() engine.CdrStorage {
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return sm.cdrDb
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}
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func (sm *FSSessionManager) Rater() engine.Connector {
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return sm.rater
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}
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// Called when call goes under the minimum duratio threshold, so FreeSWITCH can play an announcement message
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func (sm *FSSessionManager) WarnSessionMinDuration(sessionUuid, connId string) {
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if _, err := sm.conns[connId].SendApiCmd(fmt.Sprintf("uuid_broadcast %s %s aleg\n\n", sessionUuid, sm.cfg.LowBalanceAnnFile)); err != nil {
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engine.Logger.Err(fmt.Sprintf("<SM-FreeSWITCH> Could not send uuid_broadcast to freeswitch, error: %s, connection id: %s", err.Error(), connId))
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}
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}
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func (sm *FSSessionManager) Shutdown() (err error) {
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for connId, fSock := range sm.conns {
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if !fSock.Connected() {
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engine.Logger.Err(fmt.Sprintf("<SM-FreeSWITCH> Cannot shutdown sessions, fsock not connected for connection id: %s", connId))
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continue
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}
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engine.Logger.Info(fmt.Sprintf("<SM-FreeSWITCH> Shutting down all sessions on connection id: %s", connId))
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if _, err = fSock.SendApiCmd("hupall MANAGER_REQUEST cgr_reqtype prepaid"); err != nil {
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engine.Logger.Err(fmt.Sprintf("<SM-FreeSWITCH> Error on calls shutdown: %s, connection id: %s", err.Error(), connId))
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}
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}
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for guard := 0; len(sm.sessions) > 0 && guard < 20; guard++ {
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time.Sleep(100 * time.Millisecond) // wait for the hungup event to be fired
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engine.Logger.Info(fmt.Sprintf("<SM-FreeSWITC> Shutdown waiting on sessions: %v", sm.sessions))
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}
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return nil
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}
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