Port NATS api to ccMessages

pkg/nats/influxDecoder.go

@@ -0,0 +1,59 @@
+// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.
+// All rights reserved. This file is part of cc-backend.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package nats
+
+import (
+	"time"
+
+	lp "github.com/ClusterCockpit/cc-lib/ccMessage"
+	influx "github.com/influxdata/line-protocol/v2/lineprotocol"
+)
+
+// DecodeInfluxMessage decodes a single InfluxDB line protocol message from the decoder
+// Returns the decoded CCMessage or an error if decoding fails
+func DecodeInfluxMessage(d *influx.Decoder) (lp.CCMessage, error) {
+	measurement, err := d.Measurement()
+	if err != nil {
+		return nil, err
+	}
+
+	tags := make(map[string]string)
+	for {
+		key, value, err := d.NextTag()
+		if err != nil {
+			return nil, err
+		}
+		if key == nil {
+			break
+		}
+		tags[string(key)] = string(value)
+	}
+
+	fields := make(map[string]interface{})
+	for {
+		key, value, err := d.NextField()
+		if err != nil {
+			return nil, err
+		}
+		if key == nil {
+			break
+		}
+		fields[string(key)] = value.Interface()
+	}
+
+	t, err := d.Time(influx.Nanosecond, time.Time{})
+	if err != nil {
+		return nil, err
+	}
+
+	return lp.NewMessage(
+		string(measurement),
+		tags,
+		nil,
+		fields,
+		t,
+	)
+}