/
query.go
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/
query.go
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/*
Copyright 2023 NanaFS 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.
*/
package rule
import (
"context"
"github.com/basenana/nanafs/pkg/metastore"
"github.com/basenana/nanafs/pkg/types"
"github.com/basenana/nanafs/utils/logger"
"go.uber.org/zap"
"time"
)
var defaultQuery Query
func InitQuery(entryStore metastore.DEntry) {
defaultQuery = &query{
entry: entryStore,
logger: logger.NewLogger("ruleQuery"),
}
}
type Query interface {
Reset() Query
Rule(rule types.Rule) Query
Label(label types.LabelMatch) Query
Results(ctx context.Context) ([]*types.Metadata, error)
}
type query struct {
rules []types.Rule
labels []types.LabelMatch
entry metastore.DEntry
logger *zap.SugaredLogger
}
func (q *query) Reset() Query {
q.rules = nil
q.labels = nil
return &query{entry: q.entry, logger: q.logger}
}
func (q *query) Rule(rule types.Rule) Query {
q.rules = append(q.rules, rule)
if lm := ruleLabelMatch(rule); lm != nil {
q.labels = append(q.labels, *lm)
}
return q
}
func (q *query) Label(label types.LabelMatch) Query {
q.labels = append(q.labels, label)
return q
}
func (q *query) Results(ctx context.Context) ([]*types.Metadata, error) {
var (
startAt = time.Now()
entries []*types.Metadata
err error
)
defer q.logger.Infow("query entries with rules and labels",
"ruleCount", len(q.rules), "labelCount", len(q.labels), "cost", time.Since(startAt).String())
if len(q.labels) == 0 {
q.logger.Warnf("scan all entries without lable query")
}
var entriesIt metastore.EntryIterator
entriesIt, err = q.entry.FilterEntries(ctx, types.Filter{Label: mergeLabelMatch(q.labels)})
if err != nil {
q.logger.Errorw("list entries from store with label match failed", "err", err)
return nil, err
}
if len(q.rules) == 0 {
// labels only
for entriesIt.HasNext() {
entries = append(entries, entriesIt.Next())
}
return entries, nil
}
// filter in memory
for entriesIt.HasNext() {
en := entriesIt.Next()
ed, err := q.entry.GetEntryExtendData(ctx, en.ID)
if err != nil {
q.logger.Errorw("get entry extend data failed", "entry", en.ID, "err", err)
return nil, err
}
labels, err := q.entry.GetEntryLabels(ctx, en.ID)
if err != nil {
q.logger.Errorw("get entry labels failed", "entry", en.ID, "err", err)
return nil, err
}
if Filter(mergeRules(q.rules), en, &ed, &labels) {
entries = append(entries, en)
}
}
return entries, nil
}
func Q() Query {
return defaultQuery.Reset()
}