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*: implement the scheduling rule watcher (#6878)
ref #5839 - Implement the scheduling rule watcher. - Add the tests. - Refine some code. Signed-off-by: JmPotato <ghzpotato@gmail.com>
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// Copyright 2023 TiKV Project Authors. | ||
// | ||
// 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. | ||
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package rule | ||
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import ( | ||
"context" | ||
"sync" | ||
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"github.com/tikv/pd/pkg/storage/endpoint" | ||
"github.com/tikv/pd/pkg/utils/etcdutil" | ||
"go.etcd.io/etcd/clientv3" | ||
"go.etcd.io/etcd/mvcc/mvccpb" | ||
) | ||
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// ruleStorage is an in-memory storage for Placement Rules, | ||
// which will implement the `endpoint.RuleStorage` interface. | ||
type ruleStorage struct { | ||
// Rule key -> rule value. | ||
rules sync.Map | ||
// GroupID -> rule group value. | ||
groups sync.Map | ||
// Region rule key -> rule value. | ||
regionRules sync.Map | ||
} | ||
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// LoadRules loads Placement Rules from storage. | ||
func (rs *ruleStorage) LoadRules(f func(k, v string)) error { | ||
rs.rules.Range(func(k, v interface{}) bool { | ||
f(k.(string), v.(string)) | ||
return true | ||
}) | ||
return nil | ||
} | ||
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// SaveRule stores a rule cfg to the rulesPath. | ||
func (rs *ruleStorage) SaveRule(ruleKey string, rule interface{}) error { | ||
rs.rules.Store(ruleKey, rule) | ||
return nil | ||
} | ||
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// DeleteRule removes a rule from storage. | ||
func (rs *ruleStorage) DeleteRule(ruleKey string) error { | ||
rs.rules.Delete(ruleKey) | ||
return nil | ||
} | ||
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// LoadRuleGroups loads all rule groups from storage. | ||
func (rs *ruleStorage) LoadRuleGroups(f func(k, v string)) error { | ||
rs.groups.Range(func(k, v interface{}) bool { | ||
f(k.(string), v.(string)) | ||
return true | ||
}) | ||
return nil | ||
} | ||
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// SaveRuleGroup stores a rule group config to storage. | ||
func (rs *ruleStorage) SaveRuleGroup(groupID string, group interface{}) error { | ||
rs.groups.Store(groupID, group) | ||
return nil | ||
} | ||
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// DeleteRuleGroup removes a rule group from storage. | ||
func (rs *ruleStorage) DeleteRuleGroup(groupID string) error { | ||
rs.groups.Delete(groupID) | ||
return nil | ||
} | ||
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// LoadRegionRules loads region rules from storage. | ||
func (rs *ruleStorage) LoadRegionRules(f func(k, v string)) error { | ||
rs.regionRules.Range(func(k, v interface{}) bool { | ||
f(k.(string), v.(string)) | ||
return true | ||
}) | ||
return nil | ||
} | ||
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// SaveRegionRule saves a region rule to the storage. | ||
func (rs *ruleStorage) SaveRegionRule(ruleKey string, rule interface{}) error { | ||
rs.regionRules.Store(ruleKey, rule) | ||
return nil | ||
} | ||
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// DeleteRegionRule removes a region rule from storage. | ||
func (rs *ruleStorage) DeleteRegionRule(ruleKey string) error { | ||
rs.regionRules.Delete(ruleKey) | ||
return nil | ||
} | ||
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// Watcher is used to watch the PD API server for any Placement Rule changes. | ||
type Watcher struct { | ||
ctx context.Context | ||
cancel context.CancelFunc | ||
wg sync.WaitGroup | ||
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etcdClient *clientv3.Client | ||
ruleStore *ruleStorage | ||
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ruleWatcher *etcdutil.LoopWatcher | ||
groupWatcher *etcdutil.LoopWatcher | ||
labelWatcher *etcdutil.LoopWatcher | ||
} | ||
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// NewWatcher creates a new watcher to watch the Placement Rule change from PD API server. | ||
// Please use `GetRuleStorage` to get the underlying storage to access the Placement Rules. | ||
func NewWatcher( | ||
ctx context.Context, | ||
etcdClient *clientv3.Client, | ||
// rulePath: | ||
// - Key: /pd/{cluster_id}/rules/{group_id}-{rule_id} | ||
// - Value: placement.Rule | ||
// ruleGroupPath: | ||
// - Key: /pd/{cluster_id}/rule_group/{group_id} | ||
// - Value: placement.RuleGroup | ||
// regionLabelPath: | ||
// - Key: /pd/{cluster_id}/region_label/{rule_id} | ||
// - Value: labeler.LabelRule | ||
rulesPath, ruleGroupPath, regionLabelPath string, | ||
) (*Watcher, error) { | ||
ctx, cancel := context.WithCancel(ctx) | ||
rw := &Watcher{ | ||
ctx: ctx, | ||
cancel: cancel, | ||
etcdClient: etcdClient, | ||
ruleStore: &ruleStorage{}, | ||
} | ||
err := rw.initializeRuleWatcher(rulesPath) | ||
if err != nil { | ||
return nil, err | ||
} | ||
err = rw.initializeGroupWatcher(ruleGroupPath) | ||
if err != nil { | ||
return nil, err | ||
} | ||
err = rw.initializeRegionLabelWatcher(regionLabelPath) | ||
if err != nil { | ||
return nil, err | ||
} | ||
return rw, nil | ||
} | ||
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func (rw *Watcher) initializeRuleWatcher(rulePath string) error { | ||
putFn := func(kv *mvccpb.KeyValue) error { | ||
// Since the PD API server will validate the rule before saving it to etcd, | ||
// so we could directly save the string rule in JSON to the storage here. | ||
return rw.ruleStore.SaveRule(string(kv.Key), string(kv.Value)) | ||
} | ||
deleteFn := func(kv *mvccpb.KeyValue) error { | ||
return rw.ruleStore.DeleteRule(string(kv.Key)) | ||
} | ||
postEventFn := func() error { | ||
return nil | ||
} | ||
rw.ruleWatcher = etcdutil.NewLoopWatcher( | ||
rw.ctx, &rw.wg, | ||
rw.etcdClient, | ||
"scheduling-rule-watcher", rulePath, | ||
putFn, deleteFn, postEventFn, | ||
clientv3.WithPrefix(), | ||
) | ||
rw.ruleWatcher.StartWatchLoop() | ||
return rw.ruleWatcher.WaitLoad() | ||
} | ||
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func (rw *Watcher) initializeGroupWatcher(ruleGroupPath string) error { | ||
putFn := func(kv *mvccpb.KeyValue) error { | ||
return rw.ruleStore.SaveRuleGroup(string(kv.Key), string(kv.Value)) | ||
} | ||
deleteFn := func(kv *mvccpb.KeyValue) error { | ||
return rw.ruleStore.DeleteRuleGroup(string(kv.Key)) | ||
} | ||
postEventFn := func() error { | ||
return nil | ||
} | ||
rw.groupWatcher = etcdutil.NewLoopWatcher( | ||
rw.ctx, &rw.wg, | ||
rw.etcdClient, | ||
"scheduling-rule-group-watcher", ruleGroupPath, | ||
putFn, deleteFn, postEventFn, | ||
clientv3.WithPrefix(), | ||
) | ||
rw.groupWatcher.StartWatchLoop() | ||
return rw.groupWatcher.WaitLoad() | ||
} | ||
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func (rw *Watcher) initializeRegionLabelWatcher(regionLabelPath string) error { | ||
putFn := func(kv *mvccpb.KeyValue) error { | ||
return rw.ruleStore.SaveRegionRule(string(kv.Key), string(kv.Value)) | ||
} | ||
deleteFn := func(kv *mvccpb.KeyValue) error { | ||
return rw.ruleStore.DeleteRegionRule(string(kv.Key)) | ||
} | ||
postEventFn := func() error { | ||
return nil | ||
} | ||
rw.labelWatcher = etcdutil.NewLoopWatcher( | ||
rw.ctx, &rw.wg, | ||
rw.etcdClient, | ||
"scheduling-region-label-watcher", regionLabelPath, | ||
putFn, deleteFn, postEventFn, | ||
clientv3.WithPrefix(), | ||
) | ||
rw.labelWatcher.StartWatchLoop() | ||
return rw.labelWatcher.WaitLoad() | ||
} | ||
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// Close closes the watcher. | ||
func (rw *Watcher) Close() { | ||
rw.cancel() | ||
rw.wg.Wait() | ||
} | ||
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// GetRuleStorage returns the rule storage. | ||
func (rw *Watcher) GetRuleStorage() endpoint.RuleStorage { | ||
return rw.ruleStore | ||
} |
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