telegraf/plugins/serializers/graphite/graphite.go

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package graphite
import (
"fmt"
"regexp"
"sort"
"strings"
"github.com/influxdata/telegraf"
)
const DEFAULT_TEMPLATE = "host.tags.measurement.field"
var (
allowedChars = regexp.MustCompile(`[^a-zA-Z0-9-:._=\p{L}]`)
hypenChars = strings.NewReplacer(
"/", "-",
"@", "-",
"*", "-",
)
dropChars = strings.NewReplacer(
`\`, "",
"..", ".",
)
fieldDeleter = strings.NewReplacer(".FIELDNAME", "", "FIELDNAME.", "")
)
type GraphiteSerializer struct {
Prefix string
Template string
}
func (s *GraphiteSerializer) Serialize(metric telegraf.Metric) ([]byte, error) {
out := []byte{}
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// Convert UnixNano to Unix timestamps
timestamp := metric.UnixNano() / 1000000000
bucket := SerializeBucketName(metric.Name(), metric.Tags(), s.Template, s.Prefix)
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if bucket == "" {
return out, nil
}
for fieldName, value := range metric.Fields() {
switch v := value.(type) {
case string:
continue
case bool:
if v {
value = 1
} else {
value = 0
}
}
metricString := fmt.Sprintf("%s %#v %d\n",
// insert "field" section of template
sanitize(InsertField(bucket, fieldName)),
value,
timestamp)
point := []byte(metricString)
out = append(out, point...)
}
return out, nil
}
// SerializeBucketName will take the given measurement name and tags and
// produce a graphite bucket. It will use the GraphiteSerializer.Template
// to generate this, or DEFAULT_TEMPLATE.
//
// NOTE: SerializeBucketName replaces the "field" portion of the template with
// FIELDNAME. It is up to the user to replace this. This is so that
// SerializeBucketName can be called just once per measurement, rather than
// once per field. See GraphiteSerializer.InsertField() function.
func SerializeBucketName(
measurement string,
tags map[string]string,
template string,
prefix string,
) string {
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if template == "" {
template = DEFAULT_TEMPLATE
}
tagsCopy := make(map[string]string)
for k, v := range tags {
tagsCopy[k] = v
}
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var out []string
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templateParts := strings.Split(template, ".")
for _, templatePart := range templateParts {
switch templatePart {
case "measurement":
out = append(out, measurement)
case "tags":
// we will replace this later
out = append(out, "TAGS")
case "field":
// user of SerializeBucketName needs to replace this
out = append(out, "FIELDNAME")
default:
// This is a tag being applied
if tagvalue, ok := tagsCopy[templatePart]; ok {
out = append(out, strings.Replace(tagvalue, ".", "_", -1))
delete(tagsCopy, templatePart)
}
}
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}
// insert remaining tags into output name
for i, templatePart := range out {
if templatePart == "TAGS" {
out[i] = buildTags(tagsCopy)
break
}
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}
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if len(out) == 0 {
return ""
}
if prefix == "" {
return strings.Join(out, ".")
}
return prefix + "." + strings.Join(out, ".")
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}
// InsertField takes the bucket string from SerializeBucketName and replaces the
// FIELDNAME portion. If fieldName == "value", it will simply delete the
// FIELDNAME portion.
func InsertField(bucket, fieldName string) string {
// if the field name is "value", then dont use it
if fieldName == "value" {
return fieldDeleter.Replace(bucket)
}
return strings.Replace(bucket, "FIELDNAME", fieldName, 1)
}
func buildTags(tags map[string]string) string {
var keys []string
for k := range tags {
keys = append(keys, k)
}
sort.Strings(keys)
var tag_str string
for i, k := range keys {
tag_value := strings.Replace(tags[k], ".", "_", -1)
if i == 0 {
tag_str += tag_value
} else {
tag_str += "." + tag_value
}
}
return tag_str
}
func sanitize(value string) string {
// Apply special hypenation rules to preserve backwards compatibility
value = hypenChars.Replace(value)
// Apply rule to drop some chars to preserve backwards compatibility
value = dropChars.Replace(value)
// Replace any remaining illegal chars
return allowedChars.ReplaceAllLiteralString(value, "_")
}