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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 !nomeminfo
package collector
import (
"bufio"
"fmt"
"io"
"os"
"regexp"
"strconv"
"strings"
)
var (
reParens = regexp.MustCompile(`\((.*)\)`)
)
func (c *meminfoCollector) getMemInfo() (map[string]float64, error) {
file, err := os.Open(procFilePath("meminfo"))
if err != nil {
return nil, err
}
defer file.Close()
return parseMemInfo(file)
}
func parseMemInfo(r io.Reader) (map[string]float64, error) {
var (
memInfo = map[string]float64{}
scanner = bufio.NewScanner(r)
)
for scanner.Scan() {
line := scanner.Text()
parts := strings.Fields(line)
// Workaround for empty lines occasionally occur in CentOS 6.2 kernel 3.10.90.
if len(parts) == 0 {
continue
}
fv, err := strconv.ParseFloat(parts[1], 64)
if err != nil {
return nil, fmt.Errorf("invalid value in meminfo: %w", err)
}
key := parts[0][:len(parts[0])-1] // remove trailing : from key
// Active(anon) -> Active_anon
key = reParens.ReplaceAllString(key, "_${1}")
switch len(parts) {
case 2: // no unit
case 3: // has unit, we presume kB
fv *= 1024
key = key + "_bytes"
default:
return nil, fmt.Errorf("invalid line in meminfo: %s", line)
}
memInfo[key] = fv
}
return memInfo, scanner.Err()
}
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