[sr-dev] [kamailio/kamailio] Load dialogs from db at runtime, without restarting kamailio (#1274)

[alexsosic]

Ok @miconda,

So let's start with the failover case first.
I start a call on **kamailio1**:
`kamcmd> dlg.list
{
	h_entry: 2294
	h_id: 5833
	ref: 2
	call-id: lbiUaRwZR8x3mRiBjxWlJDpqkO9JHTdD
	from_uri: sip:0409828030 at proxy.alex.cloud.evox.it
	to_uri: sip:390409828030 at proxy.alex.cloud.evox.it
	state: 4
	start_ts: 1523361570
	init_ts: 1523361570
	end_ts: 0
	timeout: 1523361757
	lifetime: 187
	dflags: 643
	sflags: 0
	iflags: 1
	caller: {
		tag: 2Qp.E4ft3KpSHWbjfHVMI2Q3Jz0wEyxW
		contact: sip:0409828030 at 172.16.21.38:55236;ob
		cseq: 1646
		route_set: <sip:172.22.2.58;lr=on;ftag=2Qp.E4ft3KpSHWbjfHVMI2Q3Jz0wEyxW;did=6f8.6b92>
		socket: udp:172.22.2.57:5060
	}
	callee: {
		tag: as47e134c0
		contact: sip:39390409828030 at 172.16.201.101:5060
		cseq: 0
		route_set: <sip:172.22.2.58;lr=on;ftag=2Qp.E4ft3KpSHWbjfHVMI2Q3Jz0wEyxW;did=6f8.7b92>
		socket: udp:172.22.2.57:5060
	}
	profiles: {
	}
	variables: {
		{
			ru: sip:39390409828030 at carrier1.cloud.evox.it
		}
		{
			du: sip:172.22.2.58:5060
		}
		{
			cgrSupplier: carrier1.cloud.evox.it
		}
		{
			cgrSuppliers: carrier1.cloud.evox.it,carrier2.cloud.evox.it,carrier3.cloud.evox.it
		}
		{
			cgrCallip: 172.16.21.38
		}
		{
			cgrDestination: 39390409828030
		}
		{
			cgrAccount: 0409828030
		}
		{
			cgrTenant: evox.it
		}
		{
			cgrReqType: *prepaid
		}
		{
			calleeNumber: 39390409828030
		}
		{
			au: 0409828030
		}
		{
			authType: subscriber
		}
		{
			cgrSubsystems: "cgr_subsystems":"*resources;*suppliers;*accounts"
		}
		{
			originalSourceIP: 172.16.21.38
		}
	}
}`

I then kill the **kamailio1** and start a new node **kamailio2** with empty dispatcher list. The call is still going on... now client side I do end the call that sends a bye to **kamailio2**, so the new kamailio node does this:
`# -----------------------------------------------------------------------------
# route FOREIGN_DIALOG
# short description
# -----------------------------------------------------------------------------
route[FOREIGN_DIALOG] {
  $var(breadcrumbs) = "FOREIGN_DIALOG"; BREADCRUMBS

  xlog("L_NOTICE","[f:$fU-t:$tU id:$ci | $rm] Foreign dialog detected for Call-ID: $ci\n");

  dlg_db_load_callid($ci);
  setflag(FLG_AUTH_PASSED);

  if (is_method("BYE")) {
    route(CGR_CALL_END);
    sl_send_reply("200","OK");
  }
  exit;
} # end route FOREIGN_DIALOG`

After the call has ended I have this in the dialog inside the kamailio2 node:

`kamcmd> dlg.list
{
	h_entry: 2294
	h_id: 5833
	ref: 2
	call-id: lbiUaRwZR8x3mRiBjxWlJDpqkO9JHTdD
	from_uri: sip:0409828030 at proxy.alex.cloud.evox.it
	to_uri: sip:390409828030 at proxy.alex.cloud.evox.it
	state: 4
	start_ts: 1523361570
	init_ts: 1523361632
	end_ts: 0
	timeout: 1523361758
	lifetime: 188
	dflags: 0
	sflags: 0
	iflags: 1
	caller: {
		tag: 2Qp.E4ft3KpSHWbjfHVMI2Q3Jz0wEyxW
		contact: sip:0409828030 at 172.16.21.38:55236;ob
		cseq: 1646
		route_set: <sip:172.22.2.58;lr=on;ftag=2Qp.E4ft3KpSHWbjfHVMI2Q3Jz0wEyxW;did=6f8.6b92>
		socket:
	}
	callee: {
		tag: as47e134c0
		contact: sip:39390409828030 at 172.16.201.101:5060
		cseq: 0
		route_set: <sip:172.22.2.58;lr=on;ftag=2Qp.E4ft3KpSHWbjfHVMI2Q3Jz0wEyxW;did=6f8.7b92>
		socket:
	}
	profiles: {
	}
	variables: {
		{
			originalSourceIP: 172.16.21.38
		}
		{
			cgrSubsystems: "cgr_subsystems":"*resources;*suppliers;*accounts"
		}
		{
			authType: subscriber
		}
		{
			au: 0409828030
		}
		{
			calleeNumber: 39390409828030
		}
		{
			cgrReqType: *prepaid
		}
		{
			cgrTenant: evox.it
		}
		{
			cgrAccount: 0409828030
		}
		{
			cgrDestination: 39390409828030
		}
		{
			cgrCallip: 172.16.21.38
		}
		{
			cgrSuppliers: carrier1.cloud.evox.it,carrier2.cloud.evox.it,carrier3.cloud.evox.it
		}
		{
			cgrSupplier: carrier1.cloud.evox.it
		}
		{
			du: sip:172.22.2.58:5060
		}
		{
			ru: sip:39390409828030 at carrier1.cloud.evox.it
		}
	}
}`

This stays in memory on the node and in the DB for 2 minutes after the call has ended and then it is cleared.
Is this behaviour correct? Am I clear enough or do you want me to make a video of what's going on?
Kind regards,
Alex

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