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indexer-multi.go
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indexer-multi.go
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package backends
import (
"fmt"
"math/rand"
"github.com/ghetzel/pivot/v3/dal"
"github.com/ghetzel/pivot/v3/filter"
)
type IndexSelectionStrategy int
const (
Sequential IndexSelectionStrategy = iota
All
First
AllExceptFirst
Random
)
func (self IndexSelectionStrategy) IsCompoundable() bool {
switch self {
case All, AllExceptFirst:
return true
}
return false
}
type IndexOperation int
const (
RetrieveOperation IndexOperation = iota
PersistOperation
DeleteOperation
InspectionOperation
)
type MultiIndex struct {
RetrievalStrategy IndexSelectionStrategy
PersistStrategy IndexSelectionStrategy
DeleteStrategy IndexSelectionStrategy
InspectionStrategy IndexSelectionStrategy
indexers []Indexer
connectionStrings []string
backend Backend
}
type IndexerResult struct {
Index int
Indexer Indexer
}
type IndexerResultFunc func(indexer Indexer, current int, last int) error // {}
var IndexerResultsStop = fmt.Errorf(`stop indexer results`)
func NewMultiIndex(connectionStrings ...string) *MultiIndex {
return &MultiIndex{
RetrievalStrategy: Sequential,
PersistStrategy: All,
DeleteStrategy: All,
InspectionStrategy: All,
connectionStrings: connectionStrings,
indexers: make([]Indexer, 0),
}
}
func (self *MultiIndex) AddIndexer(indexer Indexer) error {
// if our local IndexInitialize has already run, get this new indexer initialized
if self.backend != nil {
if err := indexer.IndexInitialize(self.backend); err != nil {
return err
}
}
self.indexers = append(self.indexers, indexer)
return nil
}
func (self *MultiIndex) AddIndexerByConnectionString(cs string) error {
if ics, err := dal.ParseConnectionString(cs); err == nil {
if indexer, err := MakeIndexer(ics); err == nil {
// if our local IndexInitialize has already run, get this new indexer initialized
if self.backend != nil {
if err := indexer.IndexInitialize(self.backend); err != nil {
return err
}
}
self.indexers = append(self.indexers, indexer)
} else {
return err
}
} else {
return err
}
return nil
}
func (self *MultiIndex) IndexConnectionString() *dal.ConnectionString {
if cs, err := dal.MakeConnectionString(`multi-index`, ``, ``, nil); err == nil {
return &cs
} else {
return &dal.ConnectionString{}
}
}
func (self *MultiIndex) IndexInitialize(backend Backend) error {
self.backend = backend
for _, cs := range self.connectionStrings {
if err := self.AddIndexerByConnectionString(cs); err != nil {
return err
}
}
for _, indexer := range self.indexers {
if err := indexer.IndexInitialize(self.backend); err != nil {
return err
}
}
return nil
}
func (self *MultiIndex) GetBackend() Backend {
return self.backend
}
func (self *MultiIndex) IndexExists(collection *dal.Collection, id interface{}) bool {
exists := false
if err := self.EachSelectedIndex(collection, InspectionOperation, func(indexer Indexer, _ int, _ int) error {
if !indexer.IndexExists(collection, id) {
exists = false
querylog.Debugf("MultiIndex: Indexer %T/%v does not exist", indexer, collection.GetIndexName())
return IndexerResultsStop
} else {
exists = true
return nil
}
}); err != nil {
return false
}
return exists
}
func (self *MultiIndex) IndexRetrieve(collection *dal.Collection, id interface{}) (*dal.Record, error) {
var record *dal.Record
if err := self.EachSelectedIndex(collection, RetrieveOperation, func(indexer Indexer, _ int, _ int) error {
if r, err := indexer.IndexRetrieve(collection, id); err == nil {
record = r
return IndexerResultsStop
}
return nil
}); err != nil {
return nil, err
}
if record == nil {
return nil, fmt.Errorf("Index document %v/%v does not exist", collection, id)
}
return record, nil
}
func (self *MultiIndex) IndexRemove(collection *dal.Collection, ids []interface{}) error {
var indexErr error
if err := self.EachSelectedIndex(collection, DeleteOperation, func(indexer Indexer, _ int, _ int) error {
if err := indexer.IndexRemove(collection, ids); err != nil {
querylog.Debugf("MultiIndex: Failed to remove IDs from %v from indexer %T: %v", collection, indexer, err)
indexErr = err
}
return nil
}); err != nil {
return err
}
return indexErr
}
func (self *MultiIndex) Index(collection *dal.Collection, records *dal.RecordSet) error {
var indexErr error
if err := self.EachSelectedIndex(collection, PersistOperation, func(indexer Indexer, _ int, _ int) error {
if err := indexer.Index(collection, records); err != nil {
querylog.Debugf("MultiIndex: Failed to persist records in indexer %T: %v", indexer, err)
indexErr = err
}
return nil
}); err != nil {
return err
}
return indexErr
}
func (self *MultiIndex) QueryFunc(collection *dal.Collection, filter *filter.Filter, resultFn IndexResultFunc) error {
var indexErr error
if err := self.EachSelectedIndex(collection, RetrieveOperation, func(indexer Indexer, _ int, _ int) error {
if err := indexer.QueryFunc(collection, filter, resultFn); err == nil {
querylog.Debugf("MultiIndex: Indexer query to %v/%v: %v", indexer, collection, filter)
if self.RetrievalStrategy.IsCompoundable() {
return IndexerResultsStop
}
} else {
indexErr = err
querylog.Debugf("MultiIndex: Indexer query to %T/%v failed: %v", indexer, collection.GetIndexName(), err)
}
return nil
}); err != nil {
return err
}
return indexErr
}
func (self *MultiIndex) Query(collection *dal.Collection, filter *filter.Filter, resultFns ...IndexResultFunc) (*dal.RecordSet, error) {
recordset := dal.NewRecordSet()
var indexErr error
if err := self.EachSelectedIndex(collection, RetrieveOperation, func(indexer Indexer, _ int, _ int) error {
if rs, err := indexer.Query(collection, filter, resultFns...); err == nil {
if !rs.IsEmpty() {
if self.RetrievalStrategy.IsCompoundable() {
recordset.Append(rs)
} else {
recordset = rs
return IndexerResultsStop
}
}
} else {
indexErr = err
querylog.Debugf("MultiIndex: Indexer query to %T/%v failed: %v", indexer, collection.GetIndexName(), err)
}
return nil
}); err != nil {
return nil, err
}
return recordset, indexErr
}
func (self *MultiIndex) ListValues(collection *dal.Collection, fields []string, filter *filter.Filter) (map[string][]interface{}, error) {
values := make(map[string][]interface{})
var indexErr error
if err := self.EachSelectedIndex(collection, RetrieveOperation, func(indexer Indexer, _ int, _ int) error {
if kv, err := indexer.ListValues(collection, fields, filter); err == nil {
if len(kv) > 0 {
if self.RetrievalStrategy.IsCompoundable() {
for k, v := range kv {
if vv, ok := values[k]; ok {
values[k] = append(vv, v...)
} else {
values[k] = v
}
}
} else {
values = kv
return IndexerResultsStop
}
}
} else {
indexErr = err
querylog.Debugf("MultiIndex: Indexer list values %v/%v failed: %v", indexer, collection, err)
}
return nil
}); err != nil {
return nil, err
}
return values, indexErr
}
func (self *MultiIndex) DeleteQuery(collection *dal.Collection, f *filter.Filter) error {
var indexErr error
if err := self.EachSelectedIndex(collection, DeleteOperation, func(indexer Indexer, _ int, _ int) error {
if err := indexer.DeleteQuery(collection, f); err != nil {
querylog.Debugf("MultiIndex: Failed to remove by query %v from %v, %v: %v", f, collection, indexer, err)
indexErr = err
}
return nil
}); err != nil {
return err
}
return indexErr
}
func (self *MultiIndex) FlushIndex() error {
var errors []error
for _, indexer := range self.indexers {
if err := indexer.FlushIndex(); err != nil {
errors = append(errors, err)
}
}
if len(errors) == 0 {
return nil
} else if len(errors) == 1 {
return errors[0]
} else {
str := ``
for _, err := range errors {
str += " " + err.Error() + "\n"
}
return fmt.Errorf("multiple errors:\n%s", str)
}
}
func (self *MultiIndex) EachSelectedIndex(collection *dal.Collection, operation IndexOperation, resultFn IndexerResultFunc) error {
lastIndexer := -1
for {
if results, err := self.SelectIndex(collection, operation, lastIndexer); err == nil {
for _, result := range results {
if result.Indexer.IndexExists(collection, collection.GetIndexName()) {
if err := resultFn(result.Indexer, result.Index, lastIndexer); err != nil {
if err == IndexerResultsStop {
return nil
} else {
return err
}
}
}
lastIndexer = result.Index
}
} else {
return err
}
break
}
return nil
}
func (self *MultiIndex) SelectIndex(collection *dal.Collection, operation IndexOperation, lastIndexer int) ([]IndexerResult, error) {
var strategy IndexSelectionStrategy
switch operation {
case RetrieveOperation:
strategy = self.RetrievalStrategy
case PersistOperation:
strategy = self.PersistStrategy
case DeleteOperation:
strategy = self.DeleteStrategy
case InspectionOperation:
strategy = self.InspectionStrategy
default:
return nil, fmt.Errorf("Unrecognized index operation '%v'", operation)
}
if len(self.indexers) == 0 {
return nil, fmt.Errorf("No indexers registered")
}
switch strategy {
case Sequential:
if i := (lastIndexer + 1); i < len(self.indexers) {
return []IndexerResult{
{
Index: i,
Indexer: self.indexers[i],
},
}, nil
} else {
return nil, nil
}
case First:
return []IndexerResult{
{
Index: 0,
Indexer: self.indexers[0],
},
}, nil
case AllExceptFirst:
rv := make([]IndexerResult, 0)
for i, indexer := range self.indexers[1:] {
rv = append(rv, IndexerResult{
Index: (i + 1),
Indexer: indexer,
})
}
return rv, nil
case All:
rv := make([]IndexerResult, 0)
for i, indexer := range self.indexers {
rv = append(rv, IndexerResult{
Index: i,
Indexer: indexer,
})
}
return rv, nil
case Random:
i := rand.Intn(len(self.indexers))
return []IndexerResult{
{
Index: i,
Indexer: self.indexers[i],
},
}, nil
default:
return nil, fmt.Errorf("Unrecognized selection strategy '%v'", strategy)
}
}