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disk_usage.go
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/
disk_usage.go
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package acp
import (
"errors"
"fmt"
"sync"
"syscall"
"github.com/samuelncui/godf"
)
const (
defaultDiskUsageFreshInterval = 1024 * 1024 * 1024 * 2
)
var (
ErrTargetNoSpace = fmt.Errorf("acp: target have no space")
ErrTargetDropToReadonly = fmt.Errorf("acp: target droped into readonly")
errorMapping = []errorPair{
{from: syscall.ENOSPC, to: ErrTargetNoSpace},
{from: syscall.EROFS, to: ErrTargetDropToReadonly},
{from: syscall.EIO, to: ErrTargetDropToReadonly},
}
abortErrors = []error{
ErrTargetNoSpace,
ErrTargetDropToReadonly,
}
)
type errorPair struct {
from error
to error
}
type diskUsageCache struct {
mountPoint string
freshInterval int64
lock sync.Mutex
freeSpace int64
used int64
}
func newDiskUsageCache(mountPoint string, freshInterval int64) *diskUsageCache {
return &diskUsageCache{
mountPoint: mountPoint,
freshInterval: freshInterval,
}
}
func (m *diskUsageCache) check(need int64) error {
m.lock.Lock()
defer m.lock.Unlock()
m.used += need
if m.used <= m.freeSpace && m.used < m.freshInterval {
return nil
}
usage, err := godf.NewDiskUsage(m.mountPoint)
if err != nil {
return fmt.Errorf("get disk usage fail, mount_point= %s, %w", m.mountPoint, err)
}
m.freeSpace = usage.Available()
m.used = need
if m.used > m.freeSpace {
return fmt.Errorf("%w, want= %d have= %d", ErrTargetNoSpace, m.used, m.freeSpace)
}
return nil
}
func mappingError(err error) error {
if err == nil {
return nil
}
for _, p := range errorMapping {
if errors.Is(err, p.from) {
return fmt.Errorf("%w: %w", p.to, err)
}
}
return err
}
func checkErrorAbort(err error) bool {
for _, e := range abortErrors {
if errors.Is(err, e) {
return true
}
}
return false
}