/
filter.go
95 lines (84 loc) · 2.02 KB
/
filter.go
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package selector
import (
"context"
"time"
"github.com/go-gost/core/metadata"
mdutil "github.com/go-gost/core/metadata/util"
"github.com/go-gost/core/selector"
)
type failFilter[T any] struct {
maxFails int
failTimeout time.Duration
}
// FailFilter filters the dead objects.
// An object is marked as dead if its failed count is greater than MaxFails.
func FailFilter[T any](maxFails int, timeout time.Duration) selector.Filter[T] {
return &failFilter[T]{
maxFails: maxFails,
failTimeout: timeout,
}
}
// Filter filters dead objects.
func (f *failFilter[T]) Filter(ctx context.Context, vs ...T) []T {
if len(vs) <= 1 {
return vs
}
var l []T
for _, v := range vs {
maxFails := f.maxFails
failTimeout := f.failTimeout
if mi, _ := any(v).(metadata.Metadatable); mi != nil {
if md := mi.Metadata(); md != nil {
if md.IsExists(labelMaxFails) {
maxFails = mdutil.GetInt(md, labelMaxFails)
}
if md.IsExists(labelFailTimeout) {
failTimeout = mdutil.GetDuration(md, labelFailTimeout)
}
}
}
if maxFails <= 0 {
maxFails = 1
}
if failTimeout <= 0 {
failTimeout = DefaultFailTimeout
}
if mi, _ := any(v).(selector.Markable); mi != nil {
if marker := mi.Marker(); marker != nil {
if marker.Count() < int64(maxFails) ||
time.Since(marker.Time()) >= failTimeout {
l = append(l, v)
}
continue
}
}
l = append(l, v)
}
return l
}
type backupFilter[T any] struct{}
// BackupFilter filters the backup objects.
// An object is marked as backup if its metadata has backup flag.
func BackupFilter[T any]() selector.Filter[T] {
return &backupFilter[T]{}
}
// Filter filters backup objects.
func (f *backupFilter[T]) Filter(ctx context.Context, vs ...T) []T {
if len(vs) <= 1 {
return vs
}
var l, backups []T
for _, v := range vs {
if mi, _ := any(v).(metadata.Metadatable); mi != nil {
if mdutil.GetBool(mi.Metadata(), labelBackup) {
backups = append(backups, v)
continue
}
}
l = append(l, v)
}
if len(l) == 0 {
return backups
}
return l
}