/
carbon2.go
176 lines (147 loc) · 5.03 KB
/
carbon2.go
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package carbon2
import (
"bytes"
"errors"
"fmt"
"strconv"
"strings"
"github.com/influxdata/telegraf"
)
type format string
const (
carbon2FormatFieldEmpty = format("")
Carbon2FormatFieldSeparate = format("field_separate")
Carbon2FormatMetricIncludesField = format("metric_includes_field")
)
var formats = map[format]struct{}{
carbon2FormatFieldEmpty: {},
Carbon2FormatFieldSeparate: {},
Carbon2FormatMetricIncludesField: {},
}
const (
DefaultSanitizeReplaceChar = ":"
sanitizedChars = "!@#$%^&*()+`'\"[]{};<>,?/\\|="
)
type Serializer struct {
metricsFormat format
sanitizeReplacer *strings.Replacer
}
func NewSerializer(metricsFormat string, sanitizeReplaceChar string) (*Serializer, error) {
if sanitizeReplaceChar == "" {
sanitizeReplaceChar = DefaultSanitizeReplaceChar
} else if len(sanitizeReplaceChar) > 1 {
return nil, errors.New("sanitize replace char has to be a singular character")
}
var f = format(metricsFormat)
if _, ok := formats[f]; !ok {
return nil, fmt.Errorf("unknown carbon2 format: %s", f)
}
// When unset, default to field separate.
if f == carbon2FormatFieldEmpty {
f = Carbon2FormatFieldSeparate
}
return &Serializer{
metricsFormat: f,
sanitizeReplacer: createSanitizeReplacer(sanitizedChars, rune(sanitizeReplaceChar[0])),
}, nil
}
func (s *Serializer) Serialize(metric telegraf.Metric) ([]byte, error) {
return s.createObject(metric), nil
}
func (s *Serializer) SerializeBatch(metrics []telegraf.Metric) ([]byte, error) {
var batch bytes.Buffer
for _, metric := range metrics {
batch.Write(s.createObject(metric)) //nolint:revive // from buffer.go: "err is always nil"
}
return batch.Bytes(), nil
}
func (s *Serializer) createObject(metric telegraf.Metric) []byte {
var m bytes.Buffer
metricsFormat := s.getMetricsFormat()
for fieldName, fieldValue := range metric.Fields() {
if isString(fieldValue) {
continue
}
name := s.sanitizeReplacer.Replace(metric.Name())
switch metricsFormat {
case Carbon2FormatFieldSeparate:
m.WriteString(serializeMetricFieldSeparate(name, fieldName)) //nolint:revive // from buffer.go: "err is always nil"
case Carbon2FormatMetricIncludesField:
m.WriteString(serializeMetricIncludeField(name, fieldName)) //nolint:revive // from buffer.go: "err is always nil"
}
for _, tag := range metric.TagList() {
m.WriteString(strings.Replace(tag.Key, " ", "_", -1)) //nolint:revive // from buffer.go: "err is always nil"
m.WriteString("=") //nolint:revive // from buffer.go: "err is always nil"
value := tag.Value
if len(value) == 0 {
value = "null"
}
m.WriteString(strings.Replace(value, " ", "_", -1)) //nolint:revive // from buffer.go: "err is always nil"
m.WriteString(" ") //nolint:revive // from buffer.go: "err is always nil"
}
m.WriteString(" ") //nolint:revive // from buffer.go: "err is always nil"
m.WriteString(formatValue(fieldValue)) //nolint:revive // from buffer.go: "err is always nil"
m.WriteString(" ") //nolint:revive // from buffer.go: "err is always nil"
m.WriteString(strconv.FormatInt(metric.Time().Unix(), 10)) //nolint:revive // from buffer.go: "err is always nil"
m.WriteString("\n") //nolint:revive // from buffer.go: "err is always nil"
}
return m.Bytes()
}
func (s *Serializer) SetMetricsFormat(f format) {
s.metricsFormat = f
}
func (s *Serializer) getMetricsFormat() format {
return s.metricsFormat
}
func (s *Serializer) IsMetricsFormatUnset() bool {
return s.metricsFormat == carbon2FormatFieldEmpty
}
func serializeMetricFieldSeparate(name, fieldName string) string {
return fmt.Sprintf("metric=%s field=%s ",
strings.Replace(name, " ", "_", -1),
strings.Replace(fieldName, " ", "_", -1),
)
}
func serializeMetricIncludeField(name, fieldName string) string {
return fmt.Sprintf("metric=%s_%s ",
strings.Replace(name, " ", "_", -1),
strings.Replace(fieldName, " ", "_", -1),
)
}
func formatValue(fieldValue interface{}) string {
switch v := fieldValue.(type) {
case bool:
// Print bools as 0s and 1s
return fmt.Sprintf("%d", bool2int(v))
default:
return fmt.Sprintf("%v", v)
}
}
func isString(v interface{}) bool {
switch v.(type) {
case string:
return true
default:
return false
}
}
func bool2int(b bool) int {
// Slightly more optimized than a usual if ... return ... else return ... .
// See: https://0x0f.me/blog/golang-compiler-optimization/
var i int
if b {
i = 1
} else {
i = 0
}
return i
}
// createSanitizeReplacer creates string replacer replacing all provided
// characters with the replaceChar.
func createSanitizeReplacer(sanitizedChars string, replaceChar rune) *strings.Replacer {
sanitizeCharPairs := make([]string, 0, 2*len(sanitizedChars))
for _, c := range sanitizedChars {
sanitizeCharPairs = append(sanitizeCharPairs, string(c), string(replaceChar))
}
return strings.NewReplacer(sanitizeCharPairs...)
}