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localdb.go
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localdb.go
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package localdb
import (
"os"
"path/filepath"
"reflect"
"strings"
"sync"
"github.com/tzapio/tzap/internal/logging/tl"
"github.com/tzapio/tzap/pkg/types"
"github.com/tzapio/tzap/pkg/util/gobber"
"github.com/tzapio/tzap/pkg/util/reflectutil"
)
type FileDBState int
const (
FileDBStateNotStarted FileDBState = iota
FileDBStateNotReady
FileDBStateReady
)
type FileDB[T any] struct {
filePath string
data map[string]T
scanKeyList []types.KeyValue[T]
lock sync.RWMutex
state FileDBState
ready chan struct{} // signal when the data is ready
}
func NewFileDB[T any](filePath string) (types.DBCollectionInterface[T], error) {
tl.Logger.Printf("NewFileDB: %s\n", filePath)
db := &FileDB[T]{
filePath: filePath,
data: make(map[string]T),
ready: make(chan struct{}),
}
return db, nil
}
func (db *FileDB[T]) StartInit() {
if db.state != FileDBStateNotStarted {
return
}
db.state = FileDBStateNotReady
go func() {
// close the channel to signal we're done
defer close(db.ready)
tl.Logger.Println("NewFileDB - Loading data from ", db.filePath)
if err := db.load(); err != nil {
tl.Logger.Printf("error loading data: %v", err)
}
db.state = FileDBStateReady
}()
}
func (db *FileDB[T]) waitReady() {
if db.state == FileDBStateNotStarted {
db.StartInit()
}
<-db.ready
}
func (db *FileDB[T]) load() error {
if strings.HasPrefix(db.filePath, "@MEMORY") {
return nil
}
file, err := os.Open(db.filePath)
if err != nil {
if os.IsNotExist(err) {
absPath, err := filepath.Abs(db.filePath)
if err != nil {
return err
}
folderPath := filepath.Dir(absPath)
if err := os.MkdirAll(folderPath, 0755); err != nil {
return err
}
return nil
} else {
return err
}
}
defer file.Close()
reader := gobber.NewGobReaderIO(file)
for {
var kv types.KeyValue[T]
err := reader.Read(&kv)
if err != nil {
if err.Error() == "EOF" {
break
}
println("Old version of .tzap-data/*.db present. Please delete the .tzap-data/*.db ")
println(err.Error())
os.Exit(1)
}
db.scanKeyList = append(db.scanKeyList, kv)
if reflectutil.IsZero(kv.Value) {
delete(db.data, kv.Key)
continue
}
db.data[kv.Key] = kv.Value
}
tl.Logger.Printf("Done NewFileDB: %s Loaded: %d\n", db.filePath, len(db.data))
return nil
}
func (db *FileDB[T]) GetAll() []types.KeyValue[T] {
db.waitReady()
db.lock.RLock()
defer db.lock.RUnlock()
var values []types.KeyValue[T]
for key, value := range db.data {
if reflectutil.IsZero(value) {
continue
}
values = append(values, types.KeyValue[T]{Key: key, Value: value})
}
return values
}
func (db *FileDB[T]) ScanGet(key string) (types.KeyValue[T], bool) {
db.waitReady()
db.lock.RLock()
defer db.lock.RUnlock()
for _, kv := range db.scanKeyList {
if kv.Key == key {
return kv, true
}
}
return types.KeyValue[T]{}, false
}
func (db *FileDB[T]) Get(key string) (T, bool) {
db.waitReady()
db.lock.RLock()
defer db.lock.RUnlock()
value, exists := db.data[key]
return value, exists
}
func (db *FileDB[T]) Set(key string, value T) error {
_, err := db.BatchSet([]types.KeyValue[T]{{Key: key, Value: value}})
return err
}
func (db *FileDB[T]) BatchSet(pairs []types.KeyValue[T]) (int, error) {
db.waitReady()
db.lock.Lock()
defer db.lock.Unlock()
var writer *gobber.GobWriter
var file *os.File
if !strings.HasPrefix(db.filePath, "@MEMORY") {
filer, err := os.OpenFile(db.filePath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return 0, err
}
file = filer
defer file.Close()
writer = gobber.NewGobWriterIO(file)
}
c := 0
for _, kv := range pairs {
if reflect.DeepEqual(db.data[kv.Key], kv.Value) {
tl.Logger.Println("BatchSet - WARNING: Key already exists. ", kv.Key)
continue
}
c++
if writer != nil {
if err := writer.Write(kv); err != nil {
return c, err
}
}
db.scanKeyList = append(db.scanKeyList, kv)
if !reflectutil.IsZero(kv.Value) {
db.data[kv.Key] = kv.Value
} else {
delete(db.data, kv.Key)
}
}
if writer != nil {
if err := file.Sync(); err != nil {
return c, err
}
}
return c, nil
}