/
meminfo.go
57 lines (50 loc) · 1.25 KB
/
meminfo.go
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package machine
import (
"bufio"
"bytes"
"fmt"
)
func NewMemInfoParserHelper(str string, err error) (*MemInfo, error) {
if err != nil {
return nil, err
}
return NewMemInfoParser(str)
}
func NewMemInfoParser(str string) (*MemInfo, error) {
var err error
s := bufio.NewScanner(bytes.NewBufferString(str))
m := new(MemInfo)
fieldOfInterested := 4
for s.Scan() && fieldOfInterested > 0 {
switch {
case bytes.HasPrefix(s.Bytes(), []byte(`MemTotal:`)):
_, err = fmt.Sscanf(s.Text(), "MemTotal:%d", &m.total)
case bytes.HasPrefix(s.Bytes(), []byte(`MemFree:`)):
_, err = fmt.Sscanf(s.Text(), "MemFree:%d", &m.free)
case bytes.HasPrefix(s.Bytes(), []byte(`Buffers:`)):
_, err = fmt.Sscanf(s.Text(), "Buffers:%d", &m.buffers)
case bytes.HasPrefix(s.Bytes(), []byte(`Cached:`)):
_, err = fmt.Sscanf(s.Text(), "Cached:%d", &m.cached)
default:
continue
}
if err != nil {
return nil, err
}
fieldOfInterested--
}
return m, nil
}
type MemInfo struct {
free uint32 // in kB
cached uint32
buffers uint32
total uint32
}
const bytesInM = 1024
func (m *MemInfo) Free() string {
return fmt.Sprintf("%.2f Mib", float64(m.free)/bytesInM)
}
func (m *MemInfo) Total() string {
return fmt.Sprintf("%.2f Mib", float64(m.total)/bytesInM)
}