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bleve.go
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bleve.go
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// Copyright © 2020 The Things Network Foundation, The Things Industries B.V.
//
// 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 bleve
import (
"context"
"path"
"time"
"github.com/blevesearch/bleve"
"github.com/bluele/gcache"
"go.thethings.network/lorawan-stack/v3/pkg/devicerepository/store"
"go.thethings.network/lorawan-stack/v3/pkg/devicerepository/store/remote"
"go.thethings.network/lorawan-stack/v3/pkg/errors"
"go.thethings.network/lorawan-stack/v3/pkg/fetch"
"go.thethings.network/lorawan-stack/v3/pkg/log"
)
const (
// defaultTimeout is the timeout when trying to open the index. This is to avoid
// blocking on the index open call, which hangs indefinitely if the index is
// already in use by a different process.
defaultTimeout = 5 * time.Second
// cacheSize is the size of the cache for brands and models.
cacheSize = 1024
)
// bleveStore wraps a store.Store adding support for searching/sorting results using a bleve index.
type bleveStore struct {
ctx context.Context
store store.Store
index bleve.Index
cache gcache.Cache
}
// NewStore returns a new Device Repository store with indexing capabilities (using bleve).
func (c Config) NewStore(ctx context.Context) (store.Store, error) {
wd, err := getWorkingDirectory(c.SearchPaths)
if err != nil {
return nil, err
}
s := &bleveStore{
ctx: ctx,
store: remote.NewRemoteStore(fetch.FromFilesystem(wd)),
cache: gcache.New(cacheSize).LFU().Build(),
}
ctx, cancel := context.WithTimeout(s.ctx, defaultTimeout)
defer cancel()
s.index, err = openIndex(ctx, path.Join(wd, indexPath))
if err != nil {
return nil, err
}
go func() {
<-s.ctx.Done()
if err := s.Close(); err != nil {
log.FromContext(ctx).WithError(err).Warn("Failed to close index")
}
}()
return s, nil
}
var errCannotOpenIndex = errors.DefineNotFound("cannot_open_index", "cannot open index")
func openIndex(ctx context.Context, path string) (bleve.Index, error) {
log.FromContext(ctx).WithField("path", path).Debug("Loading index")
index, err := bleve.OpenUsing(path, map[string]any{"read_only": true, "bolt_timeout": "60s"})
if err != nil {
return nil, errCannotOpenIndex.WithAttributes("path", path).WithCause(err)
}
return index, nil
}