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package stats
import (
"bufio"
"bytes"
"context"
"os"
"path/filepath"
"strings"
)
// Storage represents /dev/sdXX/ctl.
type Storage struct {
Name string
Model string
Capacity int64
Partitions []*Partition
}
// Partition represents a part of /dev/sdXX/ctl.
type Partition struct {
Name string
Start uint64
End uint64
}
func ReadStorages(ctx context.Context, opts ...Option) ([]*Storage, error) {
cfg := newConfig(opts...)
sdctl := filepath.Join(cfg.rootdir, "/dev/sdctl")
f, err := os.Open(sdctl)
if err != nil {
return nil, err
}
defer f.Close()
var a []*Storage
scanner := bufio.NewScanner(f)
for scanner.Scan() {
fields := bytes.Split(scanner.Bytes(), delim)
if len(fields) == 0 {
continue
}
exp := string(fields[0]) + "*"
if !strings.HasPrefix(exp, "sd") {
continue
}
dir := filepath.Join(cfg.rootdir, "/dev", exp)
m, err := filepath.Glob(dir)
if err != nil {
return nil, err
}
for _, dir := range m {
s, err := readStorage(dir)
if err != nil {
return nil, err
}
a = append(a, s)
}
}
if err := scanner.Err(); err != nil {
return nil, err
}
return a, nil
}
func readStorage(dir string) (*Storage, error) {
ctl := filepath.Join(dir, "ctl")
f, err := os.Open(ctl)
if err != nil {
return nil, err
}
defer f.Close()
var s Storage
s.Name = filepath.Base(dir)
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := scanner.Bytes()
switch {
case bytes.HasPrefix(line, []byte("inquiry ")):
s.Model = string(bytes.TrimSpace(line[7:]))
case bytes.HasPrefix(line, []byte("geometry ")):
fields := bytes.Split(line, delim)
if len(fields) < 3 {
continue
}
var p intParser
sec := p.ParseInt64(string(fields[1]), 10)
size := p.ParseInt64(string(fields[2]), 10)
if err := p.Err(); err != nil {
return nil, err
}
s.Capacity = sec * size
case bytes.HasPrefix(line, []byte("part ")):
fields := bytes.Split(line, delim)
if len(fields) < 4 {
continue
}
var p intParser
start := p.ParseUint64(string(fields[2]), 10)
end := p.ParseUint64(string(fields[3]), 10)
if err := p.Err(); err != nil {
return nil, err
}
s.Partitions = append(s.Partitions, &Partition{
Name: string(fields[1]),
Start: start,
End: end,
})
}
}
if err := scanner.Err(); err != nil {
return nil, err
}
return &s, nil
}
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