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read.go
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222 lines (183 loc) · 5.41 KB
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package gitdb
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/bouggo/log"
"github.com/gogitdb/gitdb/v2/internal/db"
)
func (g *gitdb) loadBlock(blockFile string) (*db.Block, error) {
if g.loadedBlocks == nil {
g.loadedBlocks = map[string]*db.Block{}
}
//if block file is not cached, load into cache
if _, ok := g.loadedBlocks[blockFile]; !ok {
g.loadedBlocks[blockFile] = db.LoadBlock(blockFile, g.config.EncryptionKey)
}
return g.loadedBlocks[blockFile], nil
}
func (g *gitdb) doGet(id string) (*db.Record, error) {
dataset, block, _, err := ParseID(id)
if err != nil {
return nil, err
}
if !g.isRegistered(dataset) {
return nil, ErrInvalidDataset
}
blockFilePath := filepath.Join(g.dbDir(), dataset, block+".json")
if _, err := os.Stat(blockFilePath); err != nil {
return nil, ErrNoRecords
}
//we used to to a doGetByIndex here but it doesn't work properly
//TODO revisit doGetByIndex
dataBlock := db.NewEmptyBlock(g.config.EncryptionKey)
if err := dataBlock.Hydrate(blockFilePath); err != nil {
return nil, err
}
return dataBlock.Get(id)
}
//func (g *gitdb) doGetByIndex(id, dataset string) (*db.Record, error) {
// //read id index
// indexFile := filepath.Join(g.indexDir(), dataset, "id.json")
// if _, ok := g.indexCache[indexFile]; !ok {
// g.buildIndexTargeted(dataset)
// }
//
// iv, ok := g.indexCache[indexFile][id]
// if ok {
// dataBlock := db.NewEmptyBlock(g.config.EncryptionKey)
// err = dataBlock.HydrateByPositions(blockFilePath, []int{iv.Offset, iv.Len})
// if err != nil {
// log.Error(err.Error())
// return nil, fmt.Errorf("Record %s not found in %s", id, dataset)
// }
//
// record, err := dataBlock.Get(id)
// if err != nil {
// log.Error(err.Error())
// return nil, fmt.Errorf("Record %s not found in %s", id, dataset)
// }
//
// return record, nil
// }
//
// return nil, fmt.Errorf("Record %s not found in %s", id, dataset)
//}
//Get hydrates a model with specified id into result Model
func (g *gitdb) Get(id string, result Model) error {
record, err := g.doGet(id)
if err != nil {
return err
}
g.events <- newReadEvent("...", id)
return record.Hydrate(result)
}
func (g *gitdb) Exists(id string) error {
_, err := g.doGet(id)
if err == nil {
g.events <- newReadEvent("...", id)
}
return err
}
func (g *gitdb) Fetch(dataset string, blocks ...string) ([]*db.Record, error) {
if !g.isRegistered(dataset) {
return nil, ErrInvalidDataset
}
dataBlock := db.NewEmptyBlock(g.config.EncryptionKey)
if len(blocks) > 0 {
fullPath := filepath.Join(g.dbDir(), dataset)
for _, block := range blocks {
blockFile := filepath.Join(fullPath, block+".json")
log.Test("Fetching BLOCK records from - " + blockFile)
if err := dataBlock.Hydrate(blockFile); err != nil {
return nil, err
}
}
return dataBlock.Records(), nil
}
if err := g.doFetch(dataset, dataBlock); err != nil {
return nil, err
}
log.Info(fmt.Sprintf("%d records found in %s", dataBlock.Len(), dataset))
return dataBlock.Records(), nil
}
func (g *gitdb) doFetch(dataset string, dataBlock *db.EmptyBlock) error {
fullPath := filepath.Join(g.dbDir(), dataset)
//events <- newReadEvent("...", fullPath)
log.Info("Fetching records from - " + fullPath)
files, err := ioutil.ReadDir(fullPath)
if err != nil && !os.IsNotExist(err) {
return err
}
if os.IsNotExist(err) {
return ErrNoRecords
}
var fileName string
for _, file := range files {
fileName = filepath.Join(fullPath, file.Name())
if filepath.Ext(fileName) == ".json" {
if err := dataBlock.Hydrate(fileName); err != nil {
return err
}
}
}
return nil
}
func (g *gitdb) Search(dataset string, searchParams []*SearchParam, searchMode SearchMode) ([]*db.Record, error) {
if !g.isRegistered(dataset) {
return nil, ErrInvalidDataset
}
//searchBlocks return the position of the record in the block
//searchBlocks := map[string][][]int{} //index based
searchBlocks := map[string]bool{}
matchingRecords := map[string]string{}
for _, searchParam := range searchParams {
indexFile := filepath.Join(g.indexDir(), dataset, searchParam.Index+".json")
if _, ok := g.indexCache[indexFile]; !ok {
g.buildIndexTargeted(dataset)
}
g.events <- newReadEvent("...", indexFile)
queryValue := strings.ToLower(searchParam.Value)
for recordID, iv := range g.indexCache[indexFile] {
addResult := false
dbValue := strings.ToLower(iv.(string))
switch searchMode {
case SearchEquals:
addResult = dbValue == queryValue
case SearchContains:
addResult = strings.Contains(dbValue, queryValue)
case SearchStartsWith:
addResult = strings.HasPrefix(dbValue, queryValue)
case SearchEndsWith:
addResult = strings.HasSuffix(dbValue, queryValue)
}
if addResult {
dataset, block, _, err := ParseID(recordID)
if err != nil {
return nil, err
}
matchingRecords[recordID] = recordID
searchBlocks[g.blockFilePath(dataset, block)] = true
}
}
}
resultBlock := db.NewEmptyBlock(g.config.EncryptionKey)
//TODO revisit index based search
//for block, pos := range searchBlocks {
// blockFile := filepath.Join(g.dbDir(), dataset, block+".json")
// err := resultBlock.HydrateByPositions(blockFile, pos...)
// if err != nil {
// return nil, err
// }
//}
for block := range searchBlocks {
if err := resultBlock.Hydrate(block); err != nil {
log.Error(err.Error())
continue
}
}
resultBlock.Filter(matchingRecords)
return resultBlock.Records(), nil
}