114 lines
2.0 KiB
Go
114 lines
2.0 KiB
Go
package influx
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import (
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"errors"
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"fmt"
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"github.com/influxdata/telegraf"
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)
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const (
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maxErrorBufferSize = 1024
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)
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var (
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ErrNoMetric = errors.New("no metric in line")
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)
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type Handler interface {
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SetMeasurement(name []byte)
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AddTag(key []byte, value []byte)
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AddInt(key []byte, value []byte)
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AddUint(key []byte, value []byte)
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AddFloat(key []byte, value []byte)
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AddString(key []byte, value []byte)
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AddBool(key []byte, value []byte)
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SetTimestamp(tm []byte)
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Reset()
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}
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type ParseError struct {
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Offset int
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msg string
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buf string
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}
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func (e *ParseError) Error() string {
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buffer := e.buf
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if len(buffer) > maxErrorBufferSize {
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buffer = buffer[:maxErrorBufferSize] + "..."
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}
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return fmt.Sprintf("metric parse error: %s at offset %d: %q", e.msg, e.Offset, buffer)
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}
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type Parser struct {
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DefaultTags map[string]string
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*machine
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handler *MetricHandler
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}
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func NewParser(handler *MetricHandler) *Parser {
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return &Parser{
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machine: NewMachine(handler),
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handler: handler,
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}
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}
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func (p *Parser) Parse(input []byte) ([]telegraf.Metric, error) {
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metrics := make([]telegraf.Metric, 0)
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p.machine.SetData(input)
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for p.machine.ParseLine() {
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err := p.machine.Err()
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if err != nil {
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return nil, &ParseError{
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Offset: p.machine.Position(),
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msg: err.Error(),
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buf: string(input),
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}
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}
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metric, err := p.handler.Metric()
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if err != nil {
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return nil, err
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}
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p.handler.Reset()
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metrics = append(metrics, metric)
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}
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p.applyDefaultTags(metrics)
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return metrics, nil
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}
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func (p *Parser) 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, ErrNoMetric
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}
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return metrics[0], nil
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}
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func (p *Parser) SetDefaultTags(tags map[string]string) {
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p.DefaultTags = tags
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}
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func (p *Parser) applyDefaultTags(metrics []telegraf.Metric) {
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if len(p.DefaultTags) == 0 {
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return
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}
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for _, m := range metrics {
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for k, v := range p.DefaultTags {
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if !m.HasTag(k) {
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m.AddTag(k, v)
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}
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}
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}
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}
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