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udmi.go
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udmi.go
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package merge
import (
"context"
"encoding/json"
"sync"
"go.uber.org/multierr"
"go.uber.org/zap"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"github.com/vanti-dev/gobacnet"
"github.com/vanti-dev/sc-bos/pkg/auto/udmi"
"github.com/vanti-dev/sc-bos/pkg/driver/bacnet/comm"
"github.com/vanti-dev/sc-bos/pkg/driver/bacnet/config"
"github.com/vanti-dev/sc-bos/pkg/driver/bacnet/known"
status2 "github.com/vanti-dev/sc-bos/pkg/driver/bacnet/status"
"github.com/vanti-dev/sc-bos/pkg/gen"
"github.com/vanti-dev/sc-bos/pkg/gentrait/statuspb"
"github.com/vanti-dev/sc-bos/pkg/gentrait/udmipb"
"github.com/vanti-dev/sc-bos/pkg/minibus"
"github.com/vanti-dev/sc-bos/pkg/node"
"github.com/vanti-dev/sc-bos/pkg/task"
)
const UdmiMergeName = "udmi"
type UdmiMergeConfig struct {
config.Trait
TopicPrefix string `json:"topicPrefix,omitempty"`
Points map[string]*config.ValueSource `json:"points"`
}
func readUdmiMergeConfig(raw []byte) (cfg UdmiMergeConfig, err error) {
err = json.Unmarshal(raw, &cfg)
return
}
// udmiMerge implements the UdmiService and will merge multiple BACnet objects into one UDMI payload
// BACnet objects are polled for changes, and any changes sent as UDMI events
// control is implemented via OnMessage, only points present in the config are controllable.
type udmiMerge struct {
gen.UnimplementedUdmiServiceServer
client *gobacnet.Client
known known.Context
statuses *statuspb.Map
logger *zap.Logger
config UdmiMergeConfig
bus minibus.Bus[*gen.PullExportMessagesResponse]
pollTask *task.Intermittent
// protect the points value
pointsLock sync.Mutex
points udmi.PointsEvent
}
func newUdmiMerge(client *gobacnet.Client, devices known.Context, statuses *statuspb.Map, config config.RawTrait, logger *zap.Logger) (*udmiMerge, error) {
cfg, err := readUdmiMergeConfig(config.Raw)
if err != nil {
return nil, err
}
f := &udmiMerge{
client: client,
known: devices,
statuses: statuses,
config: cfg,
logger: logger,
}
f.pollTask = task.NewIntermittent(f.startPoll)
initTraitStatus(statuses, cfg.Name, "UDMI")
return f, nil
}
func (f *udmiMerge) AnnounceSelf(a node.Announcer) node.Undo {
return a.Announce(f.config.Name, node.HasTrait(udmipb.TraitName, node.WithClients(gen.WrapUdmiService(f))))
}
func (f *udmiMerge) PullControlTopics(request *gen.PullControlTopicsRequest, server gen.UdmiService_PullControlTopicsServer) error {
err := server.Send(&gen.PullControlTopicsResponse{
Name: f.config.Name,
Topics: []string{f.config.TopicPrefix + "/config"},
})
if err != nil {
return err
}
ctx := server.Context()
<-ctx.Done()
return ctx.Err()
}
func (f *udmiMerge) OnMessage(ctx context.Context, request *gen.OnMessageRequest) (*gen.OnMessageResponse, error) {
if request.Message == nil {
return nil, status.Error(codes.InvalidArgument, "no message")
}
var msg udmi.ConfigMessage
err := json.Unmarshal([]byte(request.Message.Payload), &msg)
if err != nil {
return nil, status.Errorf(codes.InvalidArgument, "invalid config message: %s", err)
}
for point, value := range msg.PointSet.Points {
if cfg, ok := f.config.Points[point]; ok {
set := value.SetValue
if floatValue, isFloat := value.SetValue.(float64); isFloat {
// let's assume for now values shouldn't be float64, true for the YABE room simulator at least
set = float32(floatValue)
}
err = comm.WriteProperty(ctx, f.client, f.known, *cfg, set, 0)
if err != nil {
return nil, status.Errorf(codes.Internal, "failed to write point %s: %s", point, err)
}
}
}
return &gen.OnMessageResponse{Name: f.config.Name}, nil
}
func (f *udmiMerge) GetExportMessage(ctx context.Context, request *gen.GetExportMessageRequest) (*gen.MqttMessage, error) {
pollCtx, cleanup := context.WithTimeout(ctx, f.config.PollTimeoutDuration()/4)
defer cleanup()
events := f.bus.Listen(pollCtx)
_ = f.pollTask.Attach(pollCtx)
select {
case <-pollCtx.Done():
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
f.pointsLock.Lock()
points := f.points
f.pointsLock.Unlock()
if len(points) == 0 {
return nil, status.Error(codes.Unavailable, "no recent events")
}
return f.pointsToPointSet(f.config.TopicPrefix, points)
case msg := <-events:
return msg.Message, nil
}
}
func (f *udmiMerge) PullExportMessages(request *gen.PullExportMessagesRequest, server gen.UdmiService_PullExportMessagesServer) error {
events := f.bus.Listen(server.Context())
_ = f.pollTask.Attach(server.Context())
// initial value
if request.IncludeLast {
f.pointsLock.Lock()
points := f.points
f.pointsLock.Unlock()
if len(points) > 0 {
msg, err := f.pointsToPointSet(f.config.TopicPrefix, points)
if err != nil {
return err
}
err = server.Send(&gen.PullExportMessagesResponse{
Name: request.Name,
Message: msg,
})
if err != nil {
return err
}
}
}
for msg := range events {
err := server.Send(msg)
if err != nil {
return err
}
}
return nil
}
func (f *udmiMerge) startPoll(init context.Context) (stop task.StopFn, err error) {
return startPoll(init, "udmi", f.config.PollPeriodDuration(), f.config.PollTimeoutDuration(), f.logger, f.pollPeer)
}
// pollPeer fetches data from the peer device, save locally, and fire a change if there is one
func (f *udmiMerge) pollPeer(ctx context.Context) error {
events := make(udmi.PointsEvent)
var errs []error
requestValues := make([]config.ValueSource, 0, len(f.config.Points))
keys := make([]string, 0, len(f.config.Points))
for key, cfg := range f.config.Points {
requestValues = append(requestValues, *cfg)
keys = append(keys, key)
}
for i, result := range comm.ReadPropertiesChunked(ctx, f.client, f.known, f.config.ChunkSize, requestValues...) {
switch e := result.(type) {
case error:
errs = append(errs, comm.ErrReadProperty{Prop: keys[i], Cause: e})
default:
events[keys[i]] = udmi.PointValue{PresentValue: e}
}
}
status2.UpdatePollErrorStatus(f.statuses, f.config.Name, "UDMI", keys, errs)
if len(errs) == len(f.config.Points) {
err := multierr.Combine(errs...)
return err
}
if len(errs) > 0 {
select {
case <-ctx.Done():
return ctx.Err()
default:
}
}
f.pointsLock.Lock()
isEqual := f.points.Equal(events)
hasUpdate := !isEqual
if hasUpdate {
f.points = events
}
f.pointsLock.Unlock()
if hasUpdate {
// send the update
msg, err := f.pointsToPointSet(f.config.TopicPrefix, events)
if err != nil {
return err
}
f.bus.Send(ctx, &gen.PullExportMessagesResponse{
Name: f.config.Name,
Message: msg,
})
}
return nil
}
func (f *udmiMerge) pointsToPointSet(topicPrefix string, points udmi.PointsEvent) (*gen.MqttMessage, error) {
b, err := json.Marshal(points)
if err != nil {
return nil, err
}
return &gen.MqttMessage{
Topic: topicPrefix + "/event/pointset/points",
Payload: string(b),
}, nil
}