package json import ( "bytes" "encoding/json" "fmt" "strconv" "strings" "time" "github.com/influxdata/telegraf" ) type JSONParser struct { MetricName string TagKeys []string DefaultTags map[string]string } func (p *JSONParser) parseArray(buf []byte) ([]telegraf.Metric, error) { metrics := make([]telegraf.Metric, 0) var jsonOut []map[string]interface{} err := json.Unmarshal(buf, &jsonOut) if err != nil { err = fmt.Errorf("unable to parse out as JSON Array, %s", err) return nil, err } for _, item := range jsonOut { metrics, err = p.parseObject(metrics, item) } return metrics, nil } func (p *JSONParser) parseObject(metrics []telegraf.Metric, jsonOut map[string]interface{}) ([]telegraf.Metric, error) { tags := make(map[string]string) for k, v := range p.DefaultTags { tags[k] = v } for _, tag := range p.TagKeys { switch v := jsonOut[tag].(type) { case string: tags[tag] = v case bool: tags[tag] = strconv.FormatBool(v) case float64: tags[tag] = strconv.FormatFloat(v, 'f', -1, 64) } delete(jsonOut, tag) } f := JSONFlattener{} err := f.FlattenJSON("", jsonOut) if err != nil { return nil, err } metric, err := telegraf.NewMetric(p.MetricName, tags, f.Fields, time.Now().UTC()) if err != nil { return nil, err } return append(metrics, metric), nil } func (p *JSONParser) Parse(buf []byte) ([]telegraf.Metric, error) { if !isarray(buf) { metrics := make([]telegraf.Metric, 0) var jsonOut map[string]interface{} err := json.Unmarshal(buf, &jsonOut) if err != nil { err = fmt.Errorf("unable to parse out as JSON, %s", err) return nil, err } return p.parseObject(metrics, jsonOut) } return p.parseArray(buf) } 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 (p *JSONParser) SetDefaultTags(tags map[string]string) { p.DefaultTags = tags } type JSONFlattener struct { Fields map[string]interface{} } // FlattenJSON flattens nested maps/interfaces into a fields map func (f *JSONFlattener) FlattenJSON( fieldname string, v interface{}, ) error { if f.Fields == nil { f.Fields = make(map[string]interface{}) } fieldname = strings.Trim(fieldname, "_") switch t := v.(type) { case map[string]interface{}: for k, v := range t { err := f.FlattenJSON(fieldname+"_"+k+"_", v) if err != nil { return err } } case []interface{}: for i, v := range t { k := strconv.Itoa(i) err := f.FlattenJSON(fieldname+"_"+k+"_", v) if err != nil { return nil } } case float64: f.Fields[fieldname] = t case bool, string, nil: // ignored types return nil default: return fmt.Errorf("JSON Flattener: got unexpected type %T with value %v (%s)", t, t, fieldname) } return nil } func isarray(buf []byte) bool { ia := bytes.IndexByte(buf, '[') ib := bytes.IndexByte(buf, '{') if ia > -1 && ia < ib { return true } else { return false } }