code for unparking the call

sessionmanager/fsevent.go

@@ -49,6 +49,7 @@ const (
 	HEARTBEAT   = "HEARTBEAT"
 	ANSWER      = "CHANNEL_ANSWER"
 	HANGUP      = "CHANNEL_HANGUP_COMPLETE"
+	PARK        = "CHANNEL_PARK"
 )
 
 // Nice printing for the event object.

sessionmanager/fssessionmanager.go

@@ -103,6 +103,8 @@ func (sm *FSSessionManager) readNextEvent(exitChan chan bool) (ev Event) {
 	switch ev.GetName() {
 	case HEARTBEAT:
 		sm.OnHeartBeat(ev)
+	case PARK:
+		sm.OnChannelPark(ev)
 	case ANSWER:
 		sm.OnChannelAnswer(ev)
 	case HANGUP:
@@ -129,6 +131,11 @@ func (sm *FSSessionManager) DisconnectSession(s *Session) {
 	s.Close()
 }
 
+// Sends the transfer command to unpark the call to freeswitch
+func (sm *FSSessionManager) UnparkCall(uuid, dest string) {
+	fmt.Fprint(sm.conn, fmt.Sprintf("uuid_transfer %s %s XML rou_cgrates\n\n", uuid, dest))
+}
+
 // Called on freeswitch's hearbeat event
 func (sm *FSSessionManager) OnHeartBeat(ev Event) {
 	if sm.sessionDelegate != nil {
@@ -138,6 +145,15 @@ func (sm *FSSessionManager) OnHeartBeat(ev Event) {
 	}
 }
 
+// Called on freeswitch's answer event
+func (sm *FSSessionManager) OnChannelPark(ev Event) {
+	if sm.sessionDelegate != nil {
+		sm.sessionDelegate.OnChannelPark(ev, sm)
+	} else {
+		timespans.Logger.Info("park")
+	}
+}
+
 // Called on freeswitch's answer event
 func (sm *FSSessionManager) OnChannelAnswer(ev Event) {
 	if sm.sessionDelegate != nil {

sessionmanager/sessiondelegate.go

@@ -21,6 +21,7 @@ package sessionmanager
 import (
 	"fmt"
 	"github.com/cgrates/cgrates/timespans"
+	"strings"
 	"time"
 )
 
@@ -34,6 +35,35 @@ func (rsd *SessionDelegate) OnHeartBeat(ev Event) {
 	timespans.Logger.Info("freeswitch ♥")
 }
 
+func (rsd *SessionDelegate) OnChannelPark(ev Event, sm SessionManager) {
+	startTime, err := ev.GetStartTime()
+	if err != nil {
+		timespans.Logger.Err("Error parsing answer event start time, using time.Now!")
+		startTime = time.Now()
+	}
+	// if there is no account configured leave the call alone
+	if strings.TrimSpace(ev.GetAccount()) == "" {
+		sm.UnparkCall(ev.GetUUID(), ev.GetDestination())
+	}
+	cd := timespans.CallDescriptor{
+		Direction:   ev.GetDirection(),
+		Tenant:      ev.GetTenant(),
+		TOR:         ev.GetTOR(),
+		Subject:     ev.GetSubject(),
+		Account:     ev.GetAccount(),
+		Destination: ev.GetDestination(),
+		TimeStart:   startTime}
+	var remainingTime float64
+	err = rsd.Connector.GetMaxSessionTime(cd, &remainingTime)
+	if err != nil {
+		timespans.Logger.Err(fmt.Sprintf("Could not get max session time for %v: %v", ev.GetUUID(), err))
+	}
+	if remainingTime == 0 {
+		timespans.Logger.Info(fmt.Sprintf("Not enough credit for trasferring the call %v.", ev.GetUUID()))
+	}
+	sm.UnparkCall(ev.GetUUID(), ev.GetDestination())
+}
+
 func (rsd *SessionDelegate) OnChannelAnswer(ev Event, s *Session) {
 	timespans.Logger.Info("freeswitch answer")
 }

sessionmanager/sessionmanager.go

@@ -24,6 +24,7 @@ import (
 
 type SessionManager interface {
 	DisconnectSession(*Session)
+	UnparkCall(string, string)
 	GetSessionDelegate() *SessionDelegate
 	GetDbLogger() timespans.DataStorage
 }

timespans/calldesc.go

@@ -286,6 +286,7 @@ func (cd *CallDescriptor) GetCost() (*CallCost, error) {
 Returns the approximate max allowed session for user balance. It will try the max amount received in the call descriptor 
 and will decrease it by 10% for nine times. So if the user has little credit it will still allow 10% of the initial amount.
 If the user has no credit then it will return 0.
+If the user has postpayied plan it returns -1. 
 */
 func (cd *CallDescriptor) GetMaxSessionTime() (seconds float64, err error) {
 	_, err = cd.LoadActivationPeriods()