[monitor-assign] Improve sanitization of the assignation list

Properly detect devices assigned to crashed or disappeared monitors and
unassign them.
Signed-off-by: Roger Pueyo Centelles <rpueyo@ac.upc.edu>

monitor-assign/monitor-assign.go

@@ -323,15 +323,59 @@ func manageMonitorsList() {
 	globalTimestamps = nextGlobalTimestamps
 }
 
+// The sanitizeAssignationsInDatabase function gets the current list of monitors
+// from the database, the current nodes<->monitors assignations, and sanitizes
+// it (unassigns crashed monitors, etc.)
+func sanitizeAssignationsInDatabase() {
+	fmt.Println("")
+	fmt.Println("Sanitizing the assignation list...")
+
+	// Update the current monitors list
+	currentMonitors := getCurrentMonitorsList()
+
+	// Update the current devices list
+	cnmlDevices = getCnmlDevicesList()
+
+	// Update the local copy of the global assignations list
+	updateGlobalAssignationList()
+
+	for _, v := range globalAssign {
+		// fmt.Println("############")
+		// fmt.Println(k, ": device ID:", v.DeviceID)
+		// fmt.Println("Monitors:", v.MonitorID)
+		for _, w := range v.MonitorID {
+			var monitorFound = false
+			for _, x := range currentMonitors {
+				if w == x {
+					monitorFound = true
+					fmt.Println(fmt.Sprintf("Monitor %s found, keeping it for device %d", w, v.DeviceID))
+				}
+			}
+			if monitorFound == false {
+				fmt.Println(fmt.Sprintf("Monitor %s not found, unassigning it from device %d", w, v.DeviceID))
+				unassignMonitorFromDevice(w, v.DeviceID)
+			}
+		}
+	}
+}
+
+func getCurrentMonitorsList() []string {
+	return goclidote.AntidoteReadItemsFromSetInBucket("guifi", "monitors")
+}
+
+func unassignMonitorFromDevice(monitorID string, deviceID int) bool {
+	return goclidote.AntidoteRemoveItemFromSetInBucket(fmt.Sprintf("device-%d", deviceID), "monitors", monitorID)
+}
+
 func reassignDevs() {
 	fmt.Println("")
 	fmt.Println("Reassignation of devices")
-	fmt.Println(cnmlDevices)
-	fmt.Println(globalAssign)
-	fmt.Println(localAssign)
-
 	fmt.Println(len(localAssign), "devices currently assigned (maximum:", maxDevs, "devices)")
 
+	//	fmt.Println(cnmlDevices)
+	//	fmt.Println(globalAssign)
+	//	fmt.Println(localAssign)
+
 	// Update the CNML devices list from AntidoteDB
 	cnmlDevices = getCnmlDevicesList()
 
@@ -555,7 +599,8 @@ func startLocalAssignTimer() {
 		for range localAssignTicker.C {
 			registerMonitorInAntidote()
 			manageMonitorsList()
-			//reassignDevs()
+			sanitizeAssignationsInDatabase()
+			reassignDevs()
 		}
 	}()
 }