func (t *tracker) CLGIDs(CLG systemspec.CLG, networkPayload objectspec.NetworkPayload) error {
destinationID := string(networkPayload.GetDestination())
sourceIDs := networkPayload.GetSources()
errors := make(chan error, len(sourceIDs))
wg := sync.WaitGroup{}
for _, s := range sourceIDs {
wg.Add(1)
go func(s string) {
// Persist the single CLG ID connections.
behaviourIDKey := key.NewNetworkKey("behaviour-id:%s:o:tracker:behaviour-ids", s)
err := t.Storage().General().PushToSet(behaviourIDKey, destinationID)
if err != nil {
errors <- maskAny(err)
}
wg.Done()
}(string(s))
}
wg.Wait()
select {
case err := <-errors:
if err != nil {
return maskAny(err)
}
default:
// Nothing do here. No error occurred. All good.
}
return nil
}
func (t *tracker) CLGNames(CLG systemspec.CLG, networkPayload objectspec.NetworkPayload) error {
destinationName := CLG.GetName()
sourceIDs := networkPayload.GetSources()
errors := make(chan error, len(sourceIDs))
wg := sync.WaitGroup{}
for _, s := range sourceIDs {
wg.Add(1)
go func(s string) {
behaviourNameKey := key.NewNetworkKey("behaviour-id:%s:behaviour-name", s)
name, err := t.Storage().General().Get(behaviourNameKey)
if err != nil {
errors <- maskAny(err)
} else {
// The errors channel is capable of buffering one error for each source
// ID. The else clause is necessary to queue only one possible error for
// each source ID. So in case the name lookup was successful, we are
// able to actually persist the single CLG name connection.
behaviourNameKey := key.NewNetworkKey("behaviour-name:%s:o:tracker:behaviour-names", name)
err := t.Storage().General().PushToSet(behaviourNameKey, destinationName)
if err != nil {
errors <- maskAny(err)
}
}
wg.Done()
}(string(s))
}
wg.Wait()
select {
case err := <-errors:
if err != nil {
return maskAny(err)
}
default:
// Nothing do here. No error occurred. All good.
}
return nil
}
func (n *network) Calculate(CLG systemspec.CLG, networkPayload objectspec.NetworkPayload) (objectspec.NetworkPayload, error) {
n.Log.WithTags(systemspec.Tags{C: nil, L: "D", O: n, V: 13}, "call Calculate")
outputs, err := filterError(reflect.ValueOf(CLG.GetCalculate()).Call(networkPayload.GetCLGInput()))
if err != nil {
return nil, maskAny(err)
}
newNetworkPayloadConfig := networkpayload.DefaultConfig()
newNetworkPayloadConfig.Args = outputs
newNetworkPayloadConfig.Context = networkPayload.GetContext()
newNetworkPayloadConfig.Destination = networkPayload.GetDestination()
newNetworkPayloadConfig.Sources = networkPayload.GetSources()
newNetworkPayload, err := networkpayload.New(newNetworkPayloadConfig)
if err != nil {
return nil, maskAny(err)
}
return newNetworkPayload, nil
}
func (a *activator) Activate(CLG systemspec.CLG, networkPayload objectspec.NetworkPayload) (objectspec.NetworkPayload, error) {
a.Log.WithTags(systemspec.Tags{C: nil, L: "D", O: a, V: 13}, "call Activate")
// Fetch the queued network payloads. queue is a string of comma separated
// JSON objects representing a specific network payload.
behaviourID, ok := networkPayload.GetContext().GetBehaviourID()
if !ok {
return nil, maskAnyf(invalidBehaviourIDError, "must not be empty")
}
queueKey := key.NewNetworkKey("activate:queue:behaviour-id:%s:network-payload", behaviourID)
s, err := a.Storage().General().Get(queueKey)
if err != nil {
return nil, maskAny(err)
}
queue, err := stringToQueue(s)
if err != nil {
return nil, maskAny(err)
}
// Merge the given network payload with the queue that we just fetched from
// storage. We store the extended queue directly after merging it with the
// given network payload to definitely track the received network payload,
// even if something goes wrong and we need to return an error on the code
// below. In case the current queue exeeds a certain amount of payloads, it is
// unlikely that the queue is going to be helpful when growing any further.
// Thus we cut the queue at some point beyond the interface capabilities of
// the requested CLG. Note that it is possible to have multiple network
// payloads sent by the same CLG. That might happen in case a specific CLG
// wants to fulfil the interface of the requested CLG on its own, even it is
// not able to do so with the output of a single calculation.
queue = append(queue, networkPayload)
queueBuffer := len(getInputTypes(CLG.GetCalculate())) + 1
if len(queue) > queueBuffer {
queue = queue[1:]
}
err = a.persistQueue(queueKey, queue)
if err != nil {
return nil, maskAny(err)
}
// This is the list of lookup functions which is executed seuqentially.
lookups := []func(CLG systemspec.CLG, queue []objectspec.NetworkPayload) (objectspec.NetworkPayload, error){
a.GetNetworkPayload,
a.New,
}
// Execute one lookup after another. As soon as we find a network payload, we
// return it.
var newNetworkPayload objectspec.NetworkPayload
for _, lookup := range lookups {
newNetworkPayload, err = lookup(CLG, queue)
if IsNetworkPayloadNotFound(err) {
// There could no network payload be found by this lookup. Go on and try
// the next one.
continue
} else if err != nil {
return nil, maskAny(err)
}
// The current lookup was successful. We do not need to execute any further
// lookup, but can go on with the network payload found.
break
}
// Filter all network payloads from the queue that are merged into the new
// network payload.
var newQueue []objectspec.NetworkPayload
for _, s := range newNetworkPayload.GetSources() {
for _, np := range queue {
// At this point there is only one source given. That is the CLG that
// forwarded the current network payload to here. If this is not the case,
// we return an error.
sources := np.GetSources()
if len(sources) != 1 {
return nil, maskAnyf(invalidSourcesError, "there must be one source")
}
if s == sources[0] {
// The current network payload is part of the merged network payload.
// Thus we do not add it to the new queue.
continue
}
newQueue = append(newQueue, np)
}
}
// Update the modified queue in the underlying storage.
err = a.persistQueue(queueKey, newQueue)
if err != nil {
return nil, maskAny(err)
}
// The current lookup was able to find a network payload. Thus we simply
// return it.
return newNetworkPayload, nil
}
