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package storage
import (
"context"
"encoding/gob"
"fmt"
"io"
"os"
"github.com/rs/zerolog"
"go.neonxp.dev/djson/internal/model"
jsonModel "go.neonxp.dev/json/model"
)
func init() {
gob.Register(new(jsonModel.ArrayNode))
gob.Register(new(jsonModel.ObjectNode))
gob.Register(new(jsonModel.StringNode))
gob.Register(new(jsonModel.BooleanNode))
gob.Register(new(jsonModel.NullNode))
gob.Register(new(jsonModel.NumberNode))
}
type fsStorage struct {
logger zerolog.Logger
enc *gob.Encoder
dec *gob.Decoder
fh *os.File
fileName string
mutationsLog []model.Mutation
}
func New(fileName string, logger zerolog.Logger) (Storage, error) {
logger.Info().Str("path", fileName).Msg("loading db")
fh, err := os.OpenFile(fileName, os.O_CREATE|os.O_APPEND|os.O_RDWR, 0o666)
if err != nil {
return nil, err
}
return &fsStorage{
logger: logger,
fileName: fileName,
fh: fh,
enc: gob.NewEncoder(fh),
dec: gob.NewDecoder(fh),
mutationsLog: []model.Mutation{},
}, nil
}
func (fs *fsStorage) Commit(ctx context.Context, mut model.Mutation) error {
if fs.enc == nil {
return fmt.Errorf("file storage not initiated")
}
return fs.enc.Encode(mut)
}
func (fs *fsStorage) Load() chan model.Mutation {
ch := make(chan model.Mutation)
go func() {
for {
m := model.Mutation{}
if err := fs.dec.Decode(&m); err != nil {
if err != io.EOF {
fs.logger.Err(err)
}
close(ch)
return
}
fs.logger.Debug().RawJSON("json", []byte(m.String())).Msg("loaded mutation")
fs.mutationsLog = append(fs.mutationsLog, m)
ch <- m
}
}()
return ch
}
func (fs *fsStorage) Close() error {
return fs.fh.Close()
}
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