mirror of
https://github.com/cgrates/cgrates.git
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342 lines
11 KiB
Go
342 lines
11 KiB
Go
/*
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Rating system designed to be used in VoIP Carriers World
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Copyright (C) 2013 ITsysCOM
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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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"bufio"
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"errors"
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"fmt"
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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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"log/syslog"
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"net"
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"strings"
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"time"
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)
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var cfg *config.CGRConfig // Share the configuration with the rest of the package
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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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conn net.Conn
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buf *bufio.Reader
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sessions []*Session
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connector engine.Connector
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debitPeriod time.Duration
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loggerDB engine.LogStorage
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}
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func NewFSSessionManager(storage engine.LogStorage, connector engine.Connector, debitPeriod time.Duration) *FSSessionManager {
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return &FSSessionManager{loggerDB: storage, connector: connector, debitPeriod: debitPeriod}
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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(cgrCfg *config.CGRConfig) (err error) {
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cfg = cgrCfg // make config global
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eventFilters := map[string]string{"Call-Direction": "inbound"}
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if fsock.FS, err = fsock.NewFSock(cfg.FreeswitchServer, cfg.FreeswitchPass, cfg.FreeswitchReconnects, sm.createHandlers(), eventFilters, engine.Logger.(*syslog.Writer)); err != nil {
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return err
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} else if !fsock.FS.Connected() {
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return errors.New("Cannot connect to FreeSWITCH")
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}
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fsock.FS.ReadEvents()
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return errors.New("stopped reading events")
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}
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func (sm *FSSessionManager) createHandlers() (handlers map[string][]func(string)) {
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hb := func(body string) {
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ev := new(FSEvent).New(body)
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sm.OnHeartBeat(ev)
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}
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cp := func(body string) {
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ev := new(FSEvent).New(body)
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sm.OnChannelPark(ev)
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}
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ca := func(body string) {
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ev := new(FSEvent).New(body)
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sm.OnChannelAnswer(ev)
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}
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ch := func(body string) {
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ev := new(FSEvent).New(body)
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sm.OnChannelHangupComplete(ev)
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}
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return map[string][]func(string){
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"HEARTBEAT": []func(string){hb},
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"CHANNEL_PARK": []func(string){cp},
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"CHANNEL_ANSWER": []func(string){ca},
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"CHANNEL_HANGUP_COMPLETE": []func(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.uuid == 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(s *Session, notify string) {
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engine.Logger.Debug(fmt.Sprintf("Session: %+v", s.uuid))
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err := fsock.FS.SendApiCmd(fmt.Sprintf("uuid_setvar %s cgr_notify %s\n\n", s.uuid, notify))
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if err != nil {
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engine.Logger.Err(fmt.Sprintf("could not send disconect api notification to freeswitch: %v", err))
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}
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err = fsock.FS.SendMsgCmd(s.uuid, map[string]string{"call-command": "hangup", "hangup-cause": "MANAGER_REQUEST"}) // without + sign
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if err != nil {
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engine.Logger.Err(fmt.Sprintf("could not send disconect msg to freeswitch: %v", err))
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}
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return
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}
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// Remove session from sessin list
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func (sm *FSSessionManager) RemoveSession(s *Session) {
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for i, ss := range sm.sessions {
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if ss == s {
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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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// Sends the transfer command to unpark the call to freeswitch
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func (sm *FSSessionManager) unparkCall(uuid, call_dest_nb, notify string) {
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err := fsock.FS.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("could not send unpark api notification to freeswitch")
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}
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err = fsock.FS.SendApiCmd(fmt.Sprintf("uuid_transfer %s %s\n\n", uuid, call_dest_nb))
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if err != nil {
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engine.Logger.Err("could not send unpark api call to freeswitch")
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}
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}
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func (sm *FSSessionManager) OnHeartBeat(ev Event) {
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engine.Logger.Info("freeswitch ♥")
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}
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func (sm *FSSessionManager) OnChannelPark(ev Event) {
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engine.Logger.Info("freeswitch park")
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startTime, err := ev.GetStartTime(PARK_TIME)
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if err != nil {
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engine.Logger.Err("Error parsing answer event start time, using time.Now!")
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startTime = time.Now()
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}
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// if there is no account configured leave the call alone
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if strings.TrimSpace(ev.GetReqType()) != utils.PREPAID {
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return
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}
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if ev.MissingParameter() {
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sm.unparkCall(ev.GetUUID(), ev.GetCallDestNr(), MISSING_PARAMETER)
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engine.Logger.Err(fmt.Sprintf("Missing parameter for %s", ev.GetUUID()))
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return
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}
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cd := engine.CallDescriptor{
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Direction: ev.GetDirection(),
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Tenant: ev.GetTenant(),
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TOR: ev.GetTOR(),
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Subject: ev.GetSubject(),
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Account: ev.GetAccount(),
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Destination: ev.GetDestination(),
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Amount: sm.debitPeriod.Seconds(),
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TimeStart: startTime}
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var remainingSeconds float64
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err = sm.connector.GetMaxSessionTime(cd, &remainingSeconds)
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if err != nil {
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engine.Logger.Err(fmt.Sprintf("Could not get max session time for %s: %v", ev.GetUUID(), err))
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sm.unparkCall(ev.GetUUID(), ev.GetCallDestNr(), SYSTEM_ERROR)
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return
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}
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engine.Logger.Info(fmt.Sprintf("Remaining seconds: %v", remainingSeconds))
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if remainingSeconds == 0 {
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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(), ev.GetCallDestNr(), INSUFFICIENT_FUNDS)
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return
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}
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sm.unparkCall(ev.GetUUID(), ev.GetCallDestNr(), AUTH_OK)
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}
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func (sm *FSSessionManager) OnChannelAnswer(ev Event) {
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engine.Logger.Info("<SessionManager> FreeSWITCH answer.")
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// Make sure cgr_type is enforced even if not set by FreeSWITCH
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if err := fsock.FS.SendApiCmd(fmt.Sprintf("uuid_setvar %s cgr_reqtype %s\n\n", ev.GetUUID(), ev.GetReqType())); err != nil {
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engine.Logger.Err(fmt.Sprintf("Error on attempting to overwrite cgr_type in chan variables: %v", err))
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}
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s := NewSession(ev, 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 Event) {
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engine.Logger.Info("<SessionManager> FreeSWITCH hangup.")
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s := sm.GetSession(ev.GetUUID())
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if s == nil { // Not handled by us
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return
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}
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defer s.Close(ev) // Stop loop and save the costs deducted so far to database
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if ev.GetReqType() == utils.POSTPAID {
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startTime, err := ev.GetStartTime(START_TIME)
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if err != nil {
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engine.Logger.Crit("Error parsing postpaid call start time from event")
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return
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}
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endTime, err := ev.GetEndTime()
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if err != nil {
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engine.Logger.Crit("Error parsing postpaid call start time from event")
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return
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}
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cd := engine.CallDescriptor{
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Direction: ev.GetDirection(),
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Tenant: ev.GetTenant(),
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TOR: ev.GetTOR(),
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Subject: ev.GetSubject(),
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Account: ev.GetAccount(),
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LoopIndex: 0,
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CallDuration: endTime.Sub(startTime),
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Destination: ev.GetDestination(),
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TimeStart: startTime,
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TimeEnd: endTime,
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}
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cc := &engine.CallCost{}
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err = sm.connector.Debit(cd, cc)
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if err != nil {
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engine.Logger.Err(fmt.Sprintf("Error making the general debit for postpaid call: %v", ev.GetUUID()))
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return
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}
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s.CallCosts = append(s.CallCosts, cc)
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return
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}
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if s == nil || len(s.CallCosts) == 0 {
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return // why would we have 0 callcosts
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}
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lastCC := s.CallCosts[len(s.CallCosts)-1]
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// put credit back
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var hangupTime time.Time
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var err error
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if hangupTime, err = ev.GetEndTime(); err != nil {
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engine.Logger.Err("Error parsing answer event hangup time, using time.Now!")
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hangupTime = time.Now()
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}
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end := lastCC.Timespans[len(lastCC.Timespans)-1].TimeEnd
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refoundDuration := end.Sub(hangupTime)
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var refoundIncrements engine.Increments
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engine.Logger.Info(fmt.Sprintf("Refund duration: %v", refoundDuration))
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for i := len(lastCC.Timespans) - 1; i >= 0; i-- {
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ts := lastCC.Timespans[i]
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tsDuration := ts.GetDuration()
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if refoundDuration <= tsDuration {
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lastRefoundedIncrementIndex := 0
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for incrementIndex, increment := range ts.Increments {
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if increment.Duration <= refoundDuration {
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refoundIncrements = append(refoundIncrements, increment)
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refoundDuration -= increment.Duration
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lastRefoundedIncrementIndex = incrementIndex
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}
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}
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ts.SplitByIncrement(lastRefoundedIncrementIndex)
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break // do not go to other timespans
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} else {
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refoundIncrements = append(refoundIncrements, ts.Increments...)
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// remove the timespan entirely
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lastCC.Timespans = lastCC.Timespans[:i]
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// continue to the next timespan with what is left to refound
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refoundDuration -= tsDuration
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}
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}
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if len(refoundIncrements) > 0 {
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cd := &engine.CallDescriptor{
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Direction: lastCC.Direction,
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Tenant: lastCC.Tenant,
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TOR: lastCC.TOR,
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Subject: lastCC.Subject,
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Account: lastCC.Account,
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Destination: lastCC.Destination,
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Increments: refoundIncrements,
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// FallbackSubject: lastCC.FallbackSubject, // TODO: check how to best add it
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}
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var response float64
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err := sm.connector.DebitCents(*cd, &response)
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if err != nil {
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engine.Logger.Err(fmt.Sprintf("Debit cents failed: %v", err))
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}
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}
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cost := refoundIncrements.GetTotalCost()
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lastCC.Cost -= cost
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engine.Logger.Info(fmt.Sprintf("Rambursed %v cents", cost))
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}
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func (sm *FSSessionManager) LoopAction(s *Session, cd *engine.CallDescriptor, index float64) (cc *engine.CallCost) {
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cc = &engine.CallCost{}
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cd.LoopIndex = index
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cd.Amount = sm.debitPeriod.Seconds()
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cd.CallDuration += sm.debitPeriod
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err := sm.connector.MaxDebit(*cd, cc)
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if err != nil {
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engine.Logger.Err(fmt.Sprintf("Could not complete debit opperation: %v", err))
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// disconnect session
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s.sessionManager.DisconnectSession(s, SYSTEM_ERROR)
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}
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engine.Logger.Debug(fmt.Sprintf("Result of MaxDebit call: %v", cc))
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if cc.GetDuration() == 0 || err != nil {
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engine.Logger.Info(fmt.Sprintf("No credit left: Disconnect %v", s))
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sm.DisconnectSession(s, INSUFFICIENT_FUNDS)
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return
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}
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s.CallCosts = append(s.CallCosts, cc)
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return
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}
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func (sm *FSSessionManager) GetDebitPeriod() time.Duration {
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return sm.debitPeriod
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}
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func (sm *FSSessionManager) GetDbLogger() engine.LogStorage {
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return sm.loggerDB
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}
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func (sm *FSSessionManager) Shutdown() (err error) {
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if fsock.FS == nil || !fsock.FS.Connected() {
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return errors.New("Cannot shutdown sessions, fsock not connected")
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}
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engine.Logger.Info("Shutting down all sessions...")
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cmdKillPrepaid := "hupall MANAGER_REQUEST cgr_reqtype prepaid"
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cmdKillPostpaid := "hupall MANAGER_REQUEST cgr_reqtype postpaid"
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for _, cmd := range []string{cmdKillPrepaid, cmdKillPostpaid} {
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if err = fsock.FS.SendApiCmd(cmd); err != nil {
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engine.Logger.Err(fmt.Sprintf("Error on calls shutdown: %s", err))
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return
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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("<SessionManager> Shutdown waiting on sessions: %v", sm.sessions))
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}
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return
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}
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