110 lines
2.1 KiB
Go
110 lines
2.1 KiB
Go
package json
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import (
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"encoding/json"
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"fmt"
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"strconv"
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"strings"
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"time"
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"github.com/influxdata/telegraf"
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)
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type JSONParser struct {
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MetricName string
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TagKeys []string
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DefaultTags map[string]string
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}
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func (p *JSONParser) Parse(buf []byte) ([]telegraf.Metric, error) {
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metrics := make([]telegraf.Metric, 0)
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var jsonOut map[string]interface{}
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err := json.Unmarshal(buf, &jsonOut)
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if err != nil {
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err = fmt.Errorf("unable to parse out as JSON, %s", err)
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return nil, err
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}
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tags := make(map[string]string)
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for k, v := range p.DefaultTags {
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tags[k] = v
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}
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for _, tag := range p.TagKeys {
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switch v := jsonOut[tag].(type) {
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case string:
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tags[tag] = v
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}
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delete(jsonOut, tag)
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}
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f := JSONFlattener{}
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err = f.FlattenJSON("", jsonOut)
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if err != nil {
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return nil, err
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}
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metric, err := telegraf.NewMetric(p.MetricName, tags, f.Fields, time.Now().UTC())
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if err != nil {
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return nil, err
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}
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return append(metrics, metric), nil
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}
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func (p *JSONParser) ParseLine(line string) (telegraf.Metric, error) {
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metrics, err := p.Parse([]byte(line + "\n"))
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if err != nil {
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return nil, err
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}
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if len(metrics) < 1 {
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return nil, fmt.Errorf("Can not parse the line: %s, for data format: influx ", line)
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}
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return metrics[0], nil
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}
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type JSONFlattener struct {
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Fields map[string]interface{}
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}
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// FlattenJSON flattens nested maps/interfaces into a fields map
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func (f *JSONFlattener) FlattenJSON(
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fieldname string,
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v interface{},
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) error {
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if f.Fields == nil {
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f.Fields = make(map[string]interface{})
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}
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fieldname = strings.Trim(fieldname, "_")
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switch t := v.(type) {
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case map[string]interface{}:
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for k, v := range t {
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err := f.FlattenJSON(fieldname+"_"+k+"_", v)
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if err != nil {
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return err
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}
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}
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case []interface{}:
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for i, v := range t {
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k := strconv.Itoa(i)
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err := f.FlattenJSON(fieldname+"_"+k+"_", v)
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if err != nil {
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return nil
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}
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}
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case float64:
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f.Fields[fieldname] = t
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case bool, string, nil:
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// ignored types
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return nil
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default:
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return fmt.Errorf("JSON Flattener: got unexpected type %T with value %v (%s)",
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t, t, fieldname)
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}
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return nil
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}
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