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nats.go
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nats.go
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package relay
import (
"context"
"fmt"
"time"
"google.golang.org/grpc"
"github.com/batchcorp/collector-schemas/build/go/protos/records"
"github.com/batchcorp/collector-schemas/build/go/protos/services"
"github.com/batchcorp/plumber/backends/nats/types"
)
func (r *Relay) handleNATS(ctx context.Context, conn *grpc.ClientConn, messages []interface{}) error {
sinkRecords, err := r.convertMessagesToNATSRecords(messages)
if err != nil {
return fmt.Errorf("unable to convert messages to nats sink records: %s", err)
}
client := services.NewGRPCCollectorClient(conn)
return r.CallWithRetry(ctx, "AddNATSRecord", func(ctx context.Context) error {
_, err := client.AddNATSRecord(ctx, &services.NATSRecordRequest{
Records: sinkRecords,
}, grpc.MaxCallSendMsgSize(MaxGRPCMessageSize))
return err
})
}
func (r *Relay) convertMessagesToNATSRecords(messages []interface{}) ([]*records.NATSRecord, error) {
sinkRecords := make([]*records.NATSRecord, 0)
for i, v := range messages {
relayMessage, ok := v.(*types.RelayMessage)
if !ok {
return nil, fmt.Errorf("unable to type assert incoming message as RelayMessage (index: %d)", i)
}
if err := r.validateNATSMessage(relayMessage); err != nil {
return nil, fmt.Errorf("unable to validate NATS relay message (index: %d): %s", i, err)
}
sinkRecords = append(sinkRecords, &records.NATSRecord{
Subject: relayMessage.Value.Subject,
Value: relayMessage.Value.Data,
Timestamp: time.Now().UTC().UnixNano(),
})
}
return sinkRecords, nil
}
// validateNATSMessage ensures all necessary values are present for a NATS relay message
func (r *Relay) validateNATSMessage(msg *types.RelayMessage) error {
if msg == nil {
return ErrMissingMessage
}
if msg.Value == nil {
return ErrMissingMessageValue
}
return nil
}