/
helper.go
37 lines (33 loc) · 1.15 KB
/
helper.go
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// Copyright 2020 The Prometheus 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 (
"fmt"
"io/ioutil"
"strconv"
"strings"
)
// NewPidFileFn create a function which could get pid from specified file
func NewPidFileFn(pidFilePath string) func() (int, error) {
return func() (int, error) {
content, err := ioutil.ReadFile(pidFilePath)
if err != nil {
return 0, fmt.Errorf("can't read pid file %s with error: %+v", pidFilePath, err)
}
value, err := strconv.Atoi(strings.TrimSpace(string(content)))
if err != nil {
return 0, fmt.Errorf("can't parse pid file %s with error: %+v", pidFilePath, err)
}
return value, nil
}
}