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worker_listener_service.go
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/
worker_listener_service.go
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package api
import (
"context"
"encoding/json"
"fmt"
"github.com/DIMO-Network/shared"
"github.com/DIMO-Network/vehicle-signal-decoding/internal/core/commands"
"github.com/ThreeDotsLabs/watermill/message"
"github.com/pkg/errors"
"github.com/rs/zerolog"
)
const (
vehicleSignalDecodingEventType = "zone.dimo.canbus.signal.update"
)
type WorkerListenerService struct {
logger zerolog.Logger
handler commands.RunTestSignalCommandHandler
}
type VechicleSignalDecodingData struct {
Signals []map[string]commands.RunTestSignalItemCommandRequest `json:"signals"`
}
func NewWorkerListenerService(logger zerolog.Logger, handler commands.RunTestSignalCommandHandler) *WorkerListenerService {
return &WorkerListenerService{
logger: logger,
handler: handler,
}
}
func (i *WorkerListenerService) ProcessWorker(messages <-chan *message.Message) {
for msg := range messages {
err := i.processMessage(msg)
if err != nil {
i.logger.Err(err).Msg("error processing task status message")
}
}
}
func (i *WorkerListenerService) processMessage(msg *message.Message) error {
// Keep the pipeline moving no matter what.
defer func() { msg.Ack() }()
event := new(shared.CloudEvent[VechicleSignalDecodingData])
if err := json.Unmarshal(msg.Payload, event); err != nil {
i.logger.Warn().Str("payload", string(msg.Payload)).Msg("failed to unmarshall processMessage payload")
return errors.Wrap(err, "error parsing vehicle signal decoding payload")
}
return i.processEvent(event)
}
func (i *WorkerListenerService) processEvent(event *shared.CloudEvent[VechicleSignalDecodingData]) error {
var (
ctx = context.Background()
)
switch event.Type {
case vehicleSignalDecodingEventType:
command := &commands.RunTestSignalCommandRequest{
AutoPIUnitID: event.Subject,
Time: event.Time,
Signals: event.Data.Signals[0], // due to way ingest is processing the message we get an array of 1 with a map of the signals
}
return i.handler.Execute(ctx, command)
default:
return fmt.Errorf("unexpected event type %s", event.Type)
}
}