Refactor the architecture of encoding parsers.

internal/encoding/json/parser.go

@@ -0,0 +1,68 @@
+package json
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/influxdata/telegraf"
+
+	"github.com/influxdata/telegraf/internal"
+	"github.com/influxdata/telegraf/internal/encoding"
+)
+
+type JsonParser struct {
+}
+
+func (p *JsonParser) Parse(buf []byte) ([]telegraf.Metric, error) {
+
+	metrics := make([]telegraf.Metric, 0)
+
+	var jsonOut interface{}
+	err := json.Unmarshal(buf, &jsonOut)
+	if err != nil {
+		err = fmt.Errorf("unable to parse out as JSON, %s", err)
+		return nil, err
+	}
+
+	f := internal.JSONFlattener{}
+	err = f.FlattenJSON("", jsonOut)
+	if err != nil {
+		return nil, err
+	}
+
+	metric, err := telegraf.NewMetric("exec", nil, f.Fields, time.Now().UTC())
+
+	if err != nil {
+		return nil, err
+	}
+	return append(metrics, metric), nil
+}
+
+func (p *JsonParser) ParseLine(line string) (telegraf.Metric, error) {
+	metrics, err := p.Parse([]byte(line + "\n"))
+
+	if err != nil {
+		return nil, err
+	}
+
+	if len(metrics) < 1 {
+		return nil, fmt.Errorf("Can not parse the line: %s, for data format: influx ", line)
+	}
+
+	return metrics[0], nil
+}
+
+func NewParser() *JsonParser {
+	return &JsonParser{}
+}
+
+func (p *JsonParser) InitConfig(configs map[string]interface{}) error {
+	return nil
+}
+
+func init() {
+	encoding.Add("json", func() encoding.Parser {
+		return NewParser()
+	})
+}