You've already forked opentelemetry-go
mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2025-10-31 00:07:40 +02:00
a485d0ec64
* Update License header for all source files - Add Apache 2.0 header to source files that did not have one. - Update all existing headers dated to 2019 to be 2020 - Remove comma from License header to comply with the Apache 2.0 guidelines. * Update Copyright notice Use the standard Copyright notices outlined by the [CNCF](https://github.com/cncf/foundation/blob/master/copyright-notices.md#copyright-notices)
85 lines
2.2 KiB
Go
85 lines
2.2 KiB
Go
// Copyright The OpenTelemetry Authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package statsd
|
|
|
|
import (
|
|
"bytes"
|
|
"sync"
|
|
|
|
export "go.opentelemetry.io/otel/sdk/export/metric"
|
|
)
|
|
|
|
// LabelEncoder encodes metric labels in the dogstatsd syntax.
|
|
//
|
|
// TODO: find a link for this syntax. It's been copied out of code,
|
|
// not a specification:
|
|
//
|
|
// https://github.com/stripe/veneur/blob/master/sinks/datadog/datadog.go
|
|
type LabelEncoder struct {
|
|
pool sync.Pool
|
|
}
|
|
|
|
// sameCheck is used to test whether label encoders are the same.
|
|
type sameCheck interface {
|
|
isStatsd()
|
|
}
|
|
|
|
var _ export.LabelEncoder = &LabelEncoder{}
|
|
|
|
// NewLabelEncoder returns a new encoder for dogstatsd-syntax metric
|
|
// labels.
|
|
func NewLabelEncoder() *LabelEncoder {
|
|
return &LabelEncoder{
|
|
pool: sync.Pool{
|
|
New: func() interface{} {
|
|
return &bytes.Buffer{}
|
|
},
|
|
},
|
|
}
|
|
}
|
|
|
|
// Encode emits a string like "|#key1:value1,key2:value2".
|
|
func (e *LabelEncoder) Encode(iter export.LabelIterator) string {
|
|
buf := e.pool.Get().(*bytes.Buffer)
|
|
defer e.pool.Put(buf)
|
|
buf.Reset()
|
|
|
|
delimiter := "|#"
|
|
|
|
for iter.Next() {
|
|
kv := iter.Label()
|
|
_, _ = buf.WriteString(delimiter)
|
|
_, _ = buf.WriteString(string(kv.Key))
|
|
_, _ = buf.WriteRune(':')
|
|
_, _ = buf.WriteString(kv.Value.Emit())
|
|
delimiter = ","
|
|
}
|
|
return buf.String()
|
|
}
|
|
|
|
func (e *LabelEncoder) isStatsd() {}
|
|
|
|
// ForceEncode returns a statsd label encoding, even if the exported
|
|
// labels were encoded by a different type of encoder. Returns a
|
|
// boolean to indicate whether the labels were in fact re-encoded, to
|
|
// test for (and warn about) efficiency.
|
|
func (e *LabelEncoder) ForceEncode(labels export.Labels) (string, bool) {
|
|
if _, ok := labels.Encoder().(sameCheck); ok {
|
|
return labels.Encoded(), false
|
|
}
|
|
|
|
return e.Encode(labels.Iter()), true
|
|
}
|