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archive.go
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archive.go
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package recording
import (
"bytes"
"compress/gzip"
"encoding/json"
"fmt"
"io/ioutil"
"os"
"sync"
"github.com/guozhaoyun/islazy/fs"
)
type LoadProgress func(perc float64, done int, total int)
type Archive struct {
sync.Mutex
Session *Record `json:"session"`
Events *Record `json:"events"`
fileName string `json:"-"`
done int `json:"-"`
total int `json:"-"`
progress float64 `json:"-"`
onProgress LoadProgress `json:"-"`
}
func New(fileName string) *Archive {
r := &Archive{
fileName: fileName,
}
r.Session = NewRecord(r.onPartialProgress)
r.Events = NewRecord(r.onPartialProgress)
return r
}
func (r *Archive) onPartialProgress(done int) {
r.done += done
r.progress = float64(r.done) / float64(r.total) * 100.0
if r.onProgress != nil {
r.onProgress(r.progress, r.done, r.total)
}
}
func Load(fileName string, cb LoadProgress) (*Archive, error) {
if !fs.Exists(fileName) {
return nil, fmt.Errorf("%s does not exist", fileName)
}
compressed, err := ioutil.ReadFile(fileName)
if err != nil {
return nil, fmt.Errorf("error while reading %s: %s", fileName, err)
}
decompress, err := gzip.NewReader(bytes.NewReader(compressed))
if err != nil {
return nil, fmt.Errorf("error while reading gzip file %s: %s", fileName, err)
}
defer decompress.Close()
raw, err := ioutil.ReadAll(decompress)
if err != nil {
return nil, fmt.Errorf("error while decompressing %s: %s", fileName, err)
}
rec := &Archive{}
decoder := json.NewDecoder(bytes.NewReader(raw))
if err = decoder.Decode(rec); err != nil {
return nil, fmt.Errorf("error while parsing %s: %s", fileName, err)
}
rec.Session.OnProgress(rec.onPartialProgress)
rec.Events.OnProgress(rec.onPartialProgress)
rec.fileName = fileName
rec.total = rec.Session.Frames() + rec.Events.Frames()
rec.progress = 0.0
rec.done = 0
rec.onProgress = cb
// reset state and precompute frames
if err = rec.Session.Compile(); err != nil {
return nil, err
} else if err = rec.Events.Compile(); err != nil {
return nil, err
}
return rec, nil
}
func (r *Archive) NewState(session []byte, events []byte) error {
if err := r.Session.AddState(session); err != nil {
return err
} else if err := r.Events.AddState(events); err != nil {
return err
}
return r.Flush()
}
func (r *Archive) save() error {
buf := new(bytes.Buffer)
encoder := json.NewEncoder(buf)
if err := encoder.Encode(r); err != nil {
return err
}
data := buf.Bytes()
compressed := new(bytes.Buffer)
compress := gzip.NewWriter(compressed)
if _, err := compress.Write(data); err != nil {
return err
} else if err = compress.Flush(); err != nil {
return err
} else if err = compress.Close(); err != nil {
return err
}
return ioutil.WriteFile(r.fileName, compressed.Bytes(), os.ModePerm)
}
func (r *Archive) Flush() error {
r.Lock()
defer r.Unlock()
return r.save()
}