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store.go
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store.go
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// Copyright (c) 2016 Couchbase, Inc.
// 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 moss provides a KVStore implementation based on the
// github.com/couchbaselabs/moss library.
package moss
import (
"encoding/json"
"fmt"
"sync"
"github.com/couchbase/moss"
"github.com/blevesearch/bleve/index/store"
"github.com/blevesearch/bleve/registry"
)
// RegistryCollectionOptions should be treated as read-only after
// process init()'ialization.
var RegistryCollectionOptions = map[string]moss.CollectionOptions{}
const Name = "moss"
type Store struct {
m sync.Mutex
ms moss.Collection
mo store.MergeOperator
llstore store.KVStore
s *stats
}
// New initializes a moss storage with values from the optional
// config["mossCollectionOptions"] (a JSON moss.CollectionOptions).
// Next, values from the RegistryCollectionOptions, named by the
// optional config["mossCollectionOptionsName"], take precedence.
// Finally, base case defaults are taken from
// moss.DefaultCollectionOptions.
func New(mo store.MergeOperator, config map[string]interface{}) (
store.KVStore, error) {
options := moss.DefaultCollectionOptions // Copy.
v, ok := config["mossCollectionOptionsName"]
if ok {
name, ok := v.(string)
if !ok {
return nil, fmt.Errorf("moss store,"+
" could not parse config[mossCollectionOptionsName]: %v", v)
}
options, ok = RegistryCollectionOptions[name] // Copy.
if !ok {
return nil, fmt.Errorf("moss store,"+
" could not find RegistryCollectionOptions, name: %s", name)
}
}
v, ok = config["mossCollectionOptions"]
if ok {
b, err := json.Marshal(v) // Convert from map[string]interface{}.
if err != nil {
return nil, fmt.Errorf("moss store,"+
" could not marshal config[mossCollectionOptions]: %v", v)
}
err = json.Unmarshal(b, &options)
if err != nil {
return nil, fmt.Errorf("moss store,"+
" could not unmarshal config[mossCollectionOptions]: %v", v)
}
}
// --------------------------------------------------
if options.Log == nil || options.Debug <= 0 {
options.Log = func(format string, a ...interface{}) {}
}
// --------------------------------------------------
mossLowerLevelStoreName := ""
v, ok = config["mossLowerLevelStoreName"]
if ok {
mossLowerLevelStoreName, ok = v.(string)
if !ok {
return nil, fmt.Errorf("moss store,"+
" could not parse config[mossLowerLevelStoreName]: %v", v)
}
}
var llStore store.KVStore
if options.LowerLevelInit == nil &&
options.LowerLevelUpdate == nil &&
mossLowerLevelStoreName != "" {
mossLowerLevelStoreConfig := map[string]interface{}{}
v, ok := config["mossLowerLevelStoreConfig"]
if ok {
mossLowerLevelStoreConfig, ok = v.(map[string]interface{})
if !ok {
return nil, fmt.Errorf("moss store, initLowerLevelStore,"+
" could parse mossLowerLevelStoreConfig: %v", v)
}
}
mossLowerLevelMaxBatchSize := uint64(0)
v, ok = config["mossLowerLevelMaxBatchSize"]
if ok {
mossLowerLevelMaxBatchSizeF, ok := v.(float64)
if !ok {
return nil, fmt.Errorf("moss store,"+
" could not parse config[mossLowerLevelMaxBatchSize]: %v", v)
}
mossLowerLevelMaxBatchSize = uint64(mossLowerLevelMaxBatchSizeF)
}
lowerLevelInit, lowerLevelUpdate, lowerLevelStore, err :=
initLowerLevelStore(mo, config,
mossLowerLevelStoreName,
mossLowerLevelStoreConfig,
mossLowerLevelMaxBatchSize,
options.Log)
if err != nil {
return nil, err
}
options.LowerLevelInit = lowerLevelInit
options.LowerLevelUpdate = lowerLevelUpdate
llStore = lowerLevelStore
}
// --------------------------------------------------
options.MergeOperator = mo
ms, err := moss.NewCollection(options)
if err != nil {
return nil, err
}
err = ms.Start()
if err != nil {
return nil, err
}
rv := Store{
ms: ms,
mo: mo,
llstore: llStore,
}
rv.s = &stats{s: &rv}
return &rv, nil
}
func (s *Store) Close() error {
return s.ms.Close()
}
func (s *Store) Reader() (store.KVReader, error) {
ss, err := s.ms.Snapshot()
if err != nil {
return nil, err
}
return &Reader{ss: ss}, nil
}
func (s *Store) Writer() (store.KVWriter, error) {
return &Writer{s: s}, nil
}
func (s *Store) Logf(fmt string, args ...interface{}) {
options := s.ms.Options()
if options.Log != nil {
options.Log(fmt, args...)
}
}
func (s *Store) Stats() json.Marshaler {
return s.s
}
func (s *Store) StatsMap() map[string]interface{} {
return s.s.statsMap()
}
func init() {
registry.RegisterKVStore(Name, New)
}