feat(scheduler): add class_metadata predicate

pkg/scheduler/algorithm/predicates/class_metadata_predicate.go

@@ -0,0 +1,136 @@
+// Copyright 2019 Yunion
+//
+// 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.
+
+package predicates
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	"yunion.io/x/pkg/errors"
+
+	"yunion.io/x/onecloud/pkg/cloudcommon/db"
+	"yunion.io/x/onecloud/pkg/compute/models"
+	"yunion.io/x/onecloud/pkg/scheduler/core"
+)
+
+type ClassMetadataPredicate struct {
+	BasePredicate
+	cacheImage *models.SCachedimage
+	//TODO GuestImage
+	snapshot         *models.SSnapshot
+	instanceSnapshot *models.SInstanceSnapshot
+	backup           *models.SDiskBackup
+	instanceBackup   *models.SInstanceBackup
+}
+
+func (p *ClassMetadataPredicate) Name() string {
+	return "class_metadata"
+}
+
+func (p *ClassMetadataPredicate) Clone() core.FitPredicate {
+	return &ClassMetadataPredicate{
+		cacheImage:       p.cacheImage,
+		snapshot:         p.snapshot,
+		instanceSnapshot: p.instanceSnapshot,
+		backup:           p.backup,
+		instanceBackup:   p.instanceBackup,
+	}
+}
+
+func (p *ClassMetadataPredicate) PreExecute(u *core.Unit, cs []core.Candidater) (bool, error) {
+	info := u.SchedData()
+	if len(info.InstanceSnapshotId) > 0 {
+		obj, err := models.InstanceSnapshotManager.FetchById(info.InstanceSnapshotId)
+		if err != nil {
+			return false, errors.Wrapf(err, "unable to fetch instanceSnapshot %s", info.InstanceSnapshotId)
+		}
+		p.instanceSnapshot = obj.(*models.SInstanceSnapshot)
+		return true, nil
+	}
+	if len(info.InstanceBackupId) > 0 {
+		obj, err := models.InstanceBackupManager.FetchById(info.InstanceBackupId)
+		if err != nil {
+			return false, errors.Wrapf(err, "unable to fetch instanceBackup %s", info.InstanceBackupId)
+		}
+		p.instanceBackup = obj.(*models.SInstanceBackup)
+		return true, nil
+	}
+	disks := info.Disks
+	if len(disks) == 0 {
+		return false, nil
+	}
+	switch {
+	case disks[0].ImageId != "":
+		obj, err := models.CachedimageManager.FetchById(disks[0].ImageId)
+		if err != nil {
+			// 忽略第一次上传到glance镜像后未缓存的记录
+			if err == sql.ErrNoRows {
+				return false, nil
+			}
+			return false, errors.Wrapf(err, "unable to fetch cachedimage %s", disks[0].ImageId)
+		}
+		p.cacheImage = obj.(*models.SCachedimage)
+		return true, nil
+	case disks[0].SnapshotId != "":
+		obj, err := models.SnapshotManager.FetchById(disks[0].SnapshotId)
+		if err != nil {
+			return false, errors.Wrapf(err, "unable to fetch snapshot %s", disks[0].SnapshotId)
+		}
+		p.snapshot = obj.(*models.SSnapshot)
+		return true, nil
+	case disks[0].BackupId != "":
+		obj, err := models.DiskBackupManager.FetchById(disks[0].BackupId)
+		if err != nil {
+			return false, errors.Wrapf(err, "unable to fetch diskbackup %s", disks[0].BackupId)
+		}
+		p.backup = obj.(*models.SDiskBackup)
+		return true, nil
+	}
+	return false, nil
+}
+
+func (p *ClassMetadataPredicate) Execute(u *core.Unit, c core.Candidater) (bool, []core.PredicateFailureReason, error) {
+	h := NewPredicateHelper(p, u, c)
+	host := c.Getter().Host()
+	ctx := context.Background()
+	resourceDesc := ""
+	var sara *db.SStandaloneAnonResourceBase
+	switch {
+	case p.cacheImage != nil:
+		sara = &p.cacheImage.SStandaloneAnonResourceBase
+		resourceDesc = fmt.Sprintf("image %s", p.cacheImage.GetName())
+	case p.snapshot != nil:
+		sara = &p.snapshot.SStandaloneAnonResourceBase
+		resourceDesc = fmt.Sprintf("snapshot %s", p.snapshot.GetName())
+	case p.backup != nil:
+		sara = &p.backup.SStandaloneAnonResourceBase
+		resourceDesc = fmt.Sprintf("backup %s", p.backup.GetName())
+	case p.instanceBackup != nil:
+		sara = &p.instanceBackup.SStandaloneAnonResourceBase
+		resourceDesc = fmt.Sprintf("instance backup %s", p.instanceBackup.GetName())
+	case p.instanceSnapshot != nil:
+		sara = &p.instanceSnapshot.SStandaloneAnonResourceBase
+		resourceDesc = fmt.Sprintf("instance snapshot %s", p.instanceSnapshot.GetName())
+	}
+	ic, err := host.IsInSameClass(ctx, sara)
+	if err != nil {
+		return false, nil, errors.Wrap(err, "unable to determine whether they are in a class")
+	}
+	if !ic {
+		h.Exclude(fmt.Sprintf("The host doesn't have the same class metadata as the choosen %s.", resourceDesc))
+	}
+	return h.GetResult()
+}