github.com/olivere/camlistore@v0.0.0-20140121221811-1b7ac2da0199/pkg/index/postgres/postgresindexer.go (about)

     1  /*
     2  Copyright 2012 The Camlistore Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8       http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  // Package postgres implements the Camlistore index storage abstraction
    18  // on top of PostgreSQL.
    19  package postgres
    20  
    21  import (
    22  	"camlistore.org/pkg/blobserver"
    23  	"camlistore.org/pkg/index"
    24  	"camlistore.org/pkg/jsonconfig"
    25  	"camlistore.org/pkg/sorted/postgres"
    26  
    27  	_ "camlistore.org/third_party/github.com/lib/pq"
    28  )
    29  
    30  func init() {
    31  	blobserver.RegisterStorageConstructor("postgresindexer", newFromConfig)
    32  }
    33  
    34  func newFromConfig(ld blobserver.Loader, config jsonconfig.Obj) (blobserver.Storage, error) {
    35  	blobPrefix := config.RequiredString("blobSource")
    36  	postgresConf, err := postgres.ConfigFromJSON(config)
    37  	if err != nil {
    38  		return nil, err
    39  	}
    40  	kv, err := postgres.NewKeyValue(postgresConf)
    41  	if err != nil {
    42  		return nil, err
    43  	}
    44  
    45  	ix := index.New(kv)
    46  	sto, err := ld.GetStorage(blobPrefix)
    47  	if err != nil {
    48  		ix.Close()
    49  		return nil, err
    50  	}
    51  	ix.BlobSource = sto
    52  	// Good enough, for now:
    53  	ix.KeyFetcher = ix.BlobSource
    54  
    55  	return ix, nil
    56  }