// CalculateGroups is a function designed to ingest a list of group objects, a collection of agents, and
// return a map that contains the resulting group for each agent UUID.
func CalculateGroups(cfg config.Config) {
tdb, err := db.NewToddDB(cfg)
if err != nil {
log.Fatalf("Error connecting to DB: %v", err)
}
// Retrieve all currently active agents
agents, err := tdb.GetAgents()
if err != nil {
log.Fatalf("Error retrieving agents: %v", err)
}
// Retrieve all objects with type "group"
group_objs, err := tdb.GetObjects("group")
if err != nil {
log.Fatalf("Error retrieving groups: %v", err)
}
// Cast retrieved slice of ToddObject interfaces to actual GroupObjects
groups := make([]objects.GroupObject, len(group_objs))
for i, gobj := range group_objs {
groups[i] = gobj.(objects.GroupObject)
}
// groupmap contains the uuid-to-groupname mappings to be used for test runs
groupmap := map[string]string{}
// This slice will hold all of the agents that are sad because they didn't get into a group
var lonelyAgents []defs.AgentAdvert
next:
for x := range agents {
for i := range groups {
// See if this agent is in this group
if isInGroup(groups[i].Spec.Matches, agents[x].Facts) {
// Insert this group name ("Label") into groupmap under the key of the UUID for the agent that belongs to it
log.Debugf("Agent %s is in group %s\n", agents[x].Uuid, groups[i].Label)
groupmap[agents[x].Uuid] = groups[i].Label
continue next
}
}
// The "continue next" should prohibit all agents that have a group from getting to this point,
// so the only ones left do not have a group.
lonelyAgents = append(lonelyAgents, agents[x])
}
// Write results to database
err = tdb.SetGroupMap(groupmap)
if err != nil {
log.Fatalf("Error setting group map: %v", err)
}
// Send notifications to each agent to let them know what group they're in, so they can cache it
var tc = comms.NewToDDComms(cfg)
for uuid, groupName := range groupmap {
setGroupTask := tasks.SetGroupTask{
GroupName: groupName,
}
setGroupTask.Type = "SetGroup" //TODO(mierdin): Apparently this is necessary because inner type promotion doesn't apply for struct literals?
tc.CommsPackage.SendTask(uuid, setGroupTask)
}
// need to send a message to all agents that weren't in groupmap to set their group to nothing
for x := range lonelyAgents {
setGroupTask := tasks.SetGroupTask{
GroupName: "",
}
setGroupTask.Type = "SetGroup" //TODO(mierdin): Apparently this is necessary because inner type promotion doesn't apply for struct literals?
tc.CommsPackage.SendTask(lonelyAgents[x].Uuid, setGroupTask)
}
}
