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parser.go
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parser.go
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package influx
import (
"errors"
"fmt"
"io"
"strings"
"sync"
"time"
"github.com/influxdata/telegraf"
)
const (
maxErrorBufferSize = 1024
)
var (
ErrNoMetric = errors.New("no metric in line")
)
type TimeFunc func() time.Time
// ParseError indicates a error in the parsing of the text.
type ParseError struct {
Offset int
LineOffset int
LineNumber int
Column int
msg string
buf string
}
func (e *ParseError) Error() string {
buffer := e.buf[e.LineOffset:]
eol := strings.IndexAny(buffer, "\n")
if eol >= 0 {
buffer = strings.TrimSuffix(buffer[:eol], "\r")
}
if len(buffer) > maxErrorBufferSize {
startEllipsis := true
offset := e.Offset - e.LineOffset
start := offset - maxErrorBufferSize
if start < 0 {
startEllipsis = false
start = 0
}
// if we trimmed it the column won't line up. it'll always be the last character,
// because the parser doesn't continue past it, but point it out anyway so
// it's obvious where the issue is.
buffer = buffer[start:offset] + "<-- here"
if startEllipsis {
buffer = "..." + buffer
}
}
return fmt.Sprintf("metric parse error: %s at %d:%d: %q", e.msg, e.LineNumber, e.Column, buffer)
}
// Parser is an InfluxDB Line Protocol parser that implements the
// parsers.Parser interface.
type Parser struct {
DefaultTags map[string]string
sync.Mutex
*machine
handler *MetricHandler
}
// NewParser returns a Parser than accepts line protocol
func NewParser(handler *MetricHandler) *Parser {
return &Parser{
machine: NewMachine(handler),
handler: handler,
}
}
// NewSeriesParser returns a Parser than accepts a measurement and tagset
func NewSeriesParser(handler *MetricHandler) *Parser {
return &Parser{
machine: NewSeriesMachine(handler),
handler: handler,
}
}
func (p *Parser) SetTimeFunc(f TimeFunc) {
p.handler.SetTimeFunc(f)
}
func (p *Parser) Parse(input []byte) ([]telegraf.Metric, error) {
p.Lock()
defer p.Unlock()
metrics := make([]telegraf.Metric, 0)
p.machine.SetData(input)
for {
err := p.machine.Next()
if err == EOF {
break
}
if err != nil {
return nil, &ParseError{
Offset: p.machine.Position(),
LineOffset: p.machine.LineOffset(),
LineNumber: p.machine.LineNumber(),
Column: p.machine.Column(),
msg: err.Error(),
buf: string(input),
}
}
metric, err := p.handler.Metric()
if err != nil {
return nil, err
}
if metric == nil {
continue
}
metrics = append(metrics, metric)
}
p.applyDefaultTags(metrics)
return metrics, nil
}
func (p *Parser) ParseLine(line string) (telegraf.Metric, error) {
metrics, err := p.Parse([]byte(line))
if err != nil {
return nil, err
}
if len(metrics) < 1 {
return nil, ErrNoMetric
}
return metrics[0], nil
}
func (p *Parser) SetDefaultTags(tags map[string]string) {
p.DefaultTags = tags
}
func (p *Parser) applyDefaultTags(metrics []telegraf.Metric) {
if len(p.DefaultTags) == 0 {
return
}
for _, m := range metrics {
p.applyDefaultTagsSingle(m)
}
}
func (p *Parser) applyDefaultTagsSingle(metric telegraf.Metric) {
for k, v := range p.DefaultTags {
if !metric.HasTag(k) {
metric.AddTag(k, v)
}
}
}
// StreamParser is an InfluxDB Line Protocol parser. It is not safe for
// concurrent use in multiple goroutines.
type StreamParser struct {
machine *streamMachine
handler *MetricHandler
}
func NewStreamParser(r io.Reader) *StreamParser {
handler := NewMetricHandler()
return &StreamParser{
machine: NewStreamMachine(r, handler),
handler: handler,
}
}
// SetTimeFunc changes the function used to determine the time of metrics
// without a timestamp. The default TimeFunc is time.Now. Useful mostly for
// testing, or perhaps if you want all metrics to have the same timestamp.
func (sp *StreamParser) SetTimeFunc(f TimeFunc) {
sp.handler.SetTimeFunc(f)
}
func (sp *StreamParser) SetTimePrecision(u time.Duration) {
sp.handler.SetTimePrecision(u)
}
// Next parses the next item from the stream. You can repeat calls to this
// function if it returns ParseError to get the next metric or error.
func (sp *StreamParser) Next() (telegraf.Metric, error) {
err := sp.machine.Next()
if err == EOF {
return nil, err
}
if e, ok := err.(*readErr); ok {
return nil, e.Err
}
if err != nil {
return nil, &ParseError{
Offset: sp.machine.Position(),
LineOffset: sp.machine.LineOffset(),
LineNumber: sp.machine.LineNumber(),
Column: sp.machine.Column(),
msg: err.Error(),
buf: sp.machine.LineText(),
}
}
metric, err := sp.handler.Metric()
if err != nil {
return nil, err
}
return metric, nil
}
// Position returns the current byte offset into the data.
func (sp *StreamParser) Position() int {
return sp.machine.Position()
}
// LineOffset returns the byte offset of the current line.
func (sp *StreamParser) LineOffset() int {
return sp.machine.LineOffset()
}
// LineNumber returns the current line number. Lines are counted based on the
// regular expression `\r?\n`.
func (sp *StreamParser) LineNumber() int {
return sp.machine.LineNumber()
}
// Column returns the current column.
func (sp *StreamParser) Column() int {
return sp.machine.Column()
}
// LineText returns the text of the current line that has been parsed so far.
func (sp *StreamParser) LineText() string {
return sp.machine.LineText()
}