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// Copyright 2015 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.
// +build !noloadavg
package collector
import (
"fmt"
"io/ioutil"
"strconv"
"strings"
)
// Read loadavg from /proc.
func getLoad() (loads []float64, err error) {
data, err := ioutil.ReadFile(procFilePath("loadavg"))
if err != nil {
return nil, err
}
loads, err = parseLoad(string(data))
if err != nil {
return nil, err
}
return loads, nil
}
// Parse /proc loadavg and return 1m, 5m and 15m.
func parseLoad(data string) (loads []float64, err error) {
loads = make([]float64, 3)
parts := strings.Fields(data)
if len(parts) < 3 {
return nil, fmt.Errorf("unexpected content in %s", procFilePath("loadavg"))
}
for i, load := range parts[0:3] {
loads[i], err = strconv.ParseFloat(load, 64)
if err != nil {
return nil, fmt.Errorf("could not parse load '%s': %w", load, err)
}
}
return loads, nil
}
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