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metrickey.go
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metrickey.go
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// Copyright (c) 2015 Uber Technologies, Inc.
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package stats
import (
"bytes"
"strings"
"sync"
)
// DefaultMetricPrefix is the default mapping for metrics to statsd keys.
// It uses a "tchannel" prefix for all stats.
func DefaultMetricPrefix(name string, tags map[string]string) string {
return MetricWithPrefix("tchannel.", name, tags)
}
var bufPool = sync.Pool{
New: func() interface{} { return &bytes.Buffer{} },
}
// MetricWithPrefix is the default mapping for metrics to statsd keys.
func MetricWithPrefix(prefix, name string, tags map[string]string) string {
buf := bufPool.Get().(*bytes.Buffer)
buf.Reset()
if prefix != "" {
buf.WriteString(prefix)
}
buf.WriteString(name)
addKeys := make([]string, 0, 5)
switch {
case strings.HasPrefix(name, "outbound"):
addKeys = append(addKeys, "service", "target-service", "target-endpoint")
if strings.HasPrefix(name, "outbound.calls.retries") {
addKeys = append(addKeys, "retry-count")
}
case strings.HasPrefix(name, "inbound"):
addKeys = append(addKeys, "calling-service", "service", "endpoint")
}
for _, k := range addKeys {
buf.WriteByte('.')
v, ok := tags[k]
if ok {
writeClean(buf, v)
} else {
buf.WriteString("no-")
buf.WriteString(k)
}
}
m := buf.String()
bufPool.Put(buf)
return m
}
// writeClean writes v, after replacing special characters [{}/\\:\s.] with '-'
func writeClean(buf *bytes.Buffer, v string) {
for i := 0; i < len(v); i++ {
c := v[i]
switch c {
case '{', '}', '/', '\\', ':', '.', ' ', '\t', '\r', '\n':
buf.WriteByte('-')
default:
buf.WriteByte(c)
}
}
}