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format.go
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format.go
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/*
Copyright © 2023 François Gouteroux <francois.gouteroux@gmail.com>
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 fmt
import (
"fmt"
"strings"
"github.com/fgouteroux/prom/pkg/metrics"
"github.com/fgouteroux/prom/pkg/utils"
)
// Format prometheus metrics text as following convention
// https://prometheus.io/docs/instrumenting/exposition_formats/#text-based-format
func Format(input string) (string, error) {
var metricsFmt string
// remove duplicates lines
strSlice := utils.UniqueStringSlice(strings.Split(input, "\n"))
// end with a newline
content := fmt.Sprintf("%s\n", strings.Join(strSlice, "\n"))
// remove return carriage
content = strings.ReplaceAll(content, "\r", "")
// text to metric family
mfs, err := metrics.ParseText(strings.NewReader(content))
if err != nil {
return metricsFmt, err
}
// metric family to text
metricsFmt, err = metrics.ParseMetricFamily(mfs)
if err != nil {
return metricsFmt, err
}
return metricsFmt, nil
}