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// 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 prometheus // import "go.opentelemetry.io/otel/exporters/prometheus"
import (
"strings"
"unicode"
)
// TODO(paivagustavo): we should provide a more uniform and controlled way of sanitizing.
// Letting users define wether we should try or not to sanitize metric names.
// This is a copy of sdk/internal/sanitize.go
// sanitize returns a string that is truncated to 100 characters if it's too
// long, and replaces non-alphanumeric characters to underscores.
func sanitize(s string) string {
if len(s) == 0 {
return s
}
// TODO(paivagustavo): change this to use a bytes buffer to avoid a large number of string allocations.
s = strings.Map(sanitizeRune, s)
if unicode.IsDigit(rune(s[0])) {
s = "key_" + s
}
if s[0] == '_' {
s = "key" + s
}
return s
}
// converts anything that is not a letter or digit to an underscore
func sanitizeRune(r rune) rune {
if unicode.IsLetter(r) || unicode.IsDigit(r) {
return r
}
// Everything else turns into an underscore
return '_'
}
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