227 lines
5.1 KiB
Go
227 lines
5.1 KiB
Go
package json
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import (
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"bytes"
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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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"github.com/jmoiron/jsonq"
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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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JSONPaths []string
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}
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func (p *JSONParser) parseArray(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 Array, %s", err)
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return nil, err
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}
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for _, item := range jsonOut {
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metrics, err = p.parseObject(metrics, item)
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}
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return metrics, nil
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}
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func (p *JSONParser) parseObject(metrics []telegraf.Metric, jsonOut map[string]interface{}) ([]telegraf.Metric, error) {
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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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case bool:
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tags[tag] = strconv.FormatBool(v)
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case float64:
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tags[tag] = strconv.FormatFloat(v, 'f', -1, 64)
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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) parsePath(metrics []telegraf.Metric, jsonOut map[string]interface{}) ([]telegraf.Metric, error) {
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jq := jsonq.NewQuery(jsonOut)
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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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if v, err := jq.String(tag); err == nil {
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tags[tag] = v
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}
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}
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for _, path := range p.JSONPaths {
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pathByNode := strings.Split(path, ".")
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if a, err := jq.ArrayOfObjects(pathByNode...); err == nil {
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metrics, err = p.parseArrayPath(metrics, a, tags)
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if err != nil {
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return nil, err
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}
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parentObj, err := jq.Object(pathByNode[:len(pathByNode)-1]...)
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if err != nil {
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return nil, err
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}
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delete(parentObj, pathByNode[len(pathByNode)-1])
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}
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if o, err := jq.Object(pathByNode...); err == nil {
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metrics, err = p.parseObjectPath(metrics, o, tags)
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if err != nil {
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return nil, err
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}
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parentObj, err := jq.Object(pathByNode[:len(pathByNode)-1]...)
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if err != nil {
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return nil, err
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}
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delete(parentObj, pathByNode[len(pathByNode)-1])
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}
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}
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return metrics, nil
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}
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func (p *JSONParser) parseArrayPath(metrics []telegraf.Metric, jsonOut []map[string]interface{}, tags map[string]string) ([]telegraf.Metric, error) {
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var err error
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for _, doc := range jsonOut {
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metrics, err = p.parseObjectPath(metrics, doc, tags)
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if err != nil {
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return nil, err
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}
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}
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return metrics, nil
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}
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func (p *JSONParser) parseObjectPath(metrics []telegraf.Metric, jsonOut map[string]interface{}, tags map[string]string) ([]telegraf.Metric, error) {
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jq := jsonq.NewQuery(jsonOut)
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for _, tag := range p.TagKeys {
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if v, err := jq.String(tag); err == nil {
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tags[tag] = v
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}
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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) Parse(buf []byte) ([]telegraf.Metric, error) {
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if !isarray(buf) {
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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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if len(p.JSONPaths) > 0 {
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metrics, err = p.parsePath(metrics, jsonOut)
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}
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return p.parseObject(metrics, jsonOut)
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}
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return p.parseArray(buf)
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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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func (p *JSONParser) SetDefaultTags(tags map[string]string) {
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p.DefaultTags = tags
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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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func isarray(buf []byte) bool {
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ia := bytes.IndexByte(buf, '[')
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ib := bytes.IndexByte(buf, '{')
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if ia > -1 && ia < ib {
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return true
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} else {
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return false
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}
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}
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