cubefs

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// Copyright 2019 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package procfs
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import (
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	"fmt"
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	"strconv"
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	"strings"
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	"github.com/prometheus/procfs/internal/util"
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)
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// LoadAvg represents an entry in /proc/loadavg.
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type LoadAvg struct {
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	Load1  float64
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	Load5  float64
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	Load15 float64
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}
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// LoadAvg returns loadavg from /proc.
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func (fs FS) LoadAvg() (*LoadAvg, error) {
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	path := fs.proc.Path("loadavg")
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	data, err := util.ReadFileNoStat(path)
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	if err != nil {
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		return nil, err
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	}
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	return parseLoad(data)
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}
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// Parse /proc loadavg and return 1m, 5m and 15m.
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func parseLoad(loadavgBytes []byte) (*LoadAvg, error) {
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	loads := make([]float64, 3)
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	parts := strings.Fields(string(loadavgBytes))
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	if len(parts) < 3 {
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		return nil, fmt.Errorf("malformed loadavg line: too few fields in loadavg string: %q", string(loadavgBytes))
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	}
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	var err error
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	for i, load := range parts[0:3] {
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		loads[i], err = strconv.ParseFloat(load, 64)
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		if err != nil {
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			return nil, fmt.Errorf("could not parse load %q: %w", load, err)
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		}
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	}
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	return &LoadAvg{
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		Load1:  loads[0],
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		Load5:  loads[1],
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		Load15: loads[2],
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	}, nil
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}
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