/
file.go
283 lines (198 loc) · 5.89 KB
/
file.go
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/*
Copyright 2016 Deepak Agarwal
Author : Deepak Agarwal
*/
package main
import (
"encoding/gob"
"os"
"fmt"
"errors"
"bytes"
"sync"
"github.com/emirpasic/gods/sets/treeset"
)
func (store *db) Save(filename string) (bool){
store.mapDBLock.Lock()
store.setmapDBLock.Lock()
defer store.mapDBLock.Unlock()
defer store.setmapDBLock.Unlock()
// create a file
dataFile, err := os.Create(filename)
if err != nil {
fmt.Println("Save Create error : " , err)
return false
}
enc := gob.NewEncoder(dataFile)
err = enc.Encode(store)
if err != nil {
fmt.Printf("Save Encode error : ", err)
return false
}
dataFile.Close()
return true
}
func (store *db) Load(filename string) (bool){
store.mapDBLock.Lock()
store.setmapDBLock.Lock()
defer store.mapDBLock.Unlock()
defer store.setmapDBLock.Unlock()
// open data file
dataFile, err := os.Open(filename)
if err != nil {
fmt.Println("Load Open error : ", err)
return false
}
dec := gob.NewDecoder(dataFile)
err = dec.Decode(store)
if err != nil {
fmt.Println("Load Decode error : ", err)
return false
}
dataFile.Close()
return true
}
func (store *db) MarshalBinary() ([]byte, error) {
if store == nil {
return nil, errors.New(fmt.Sprintf("MarshalBinary : store nil"))
}
if store.mapEntry == nil {
return nil, errors.New(fmt.Sprintf("MarshalBinary : store.mapEntry nil"))
}
if store.setmapEntry == nil {
return nil, errors.New(fmt.Sprintf("MarshalBinary : store.setmapEntry nil"))
}
var b bytes.Buffer
//Marshal mapEntry
if len(store.mapEntry) != 0 {
fmt.Fprintln(&b, len(store.mapEntry))
for key,value := range store.mapEntry {
fmt.Fprintln(&b, key)
//Marshal mapData.val
if value != nil {
fmt.Fprintln(&b, value.val)
fmt.Fprintln(&b, value.Expiration)
//Marshal mapData.lock skipped - not required
} else {
return nil, errors.New(fmt.Sprintf("MarshalBinary : err store.mapEntry key : %v value : nil", key))
}
}
}
//Marshal mapDBLock skipped - not required
fmt.Fprintln(&b, len(store.setmapEntry))
//Marshal setmapEntry
if len(store.setmapEntry) != 0 {
for key,value := range store.setmapEntry {
fmt.Fprintln(&b, key)
//Marshal setmapData.setEntry
fmt.Fprintln(&b, len(value.setEntry))
if value != nil {
for key2,value2 := range value.setEntry {
fmt.Fprintln(&b, key2)
if value2 != nil {
fmt.Fprintln(&b, value2.Size())
for _, v := range value2.Values() {
fmt.Fprintln(&b, fmt.Sprintf("%v",v))
}
} else {
return nil, errors.New(fmt.Sprintf("MarshalBinary : err store.setmapEntry key : %v setEntry key2 : %v value2 : nill", key, key2))
}
}
} else {
return nil, errors.New(fmt.Sprintf("MarshalBinary : err store.setmapEntry key : %v value : nill", key))
}
//Marshal setmapData.lock skipped - not required
}
}
//Marshal setmapLock skipped - not required
return b.Bytes(), nil
}
func (store *db) UnmarshalBinary(data []byte) error {
if store == nil {
return errors.New(fmt.Sprintf("UnmarshalBinary : store nil"))
}
if store.mapEntry == nil {
return errors.New(fmt.Sprintf("UnmarshalBinary : store.mapEntry nil"))
}
if store.setmapEntry == nil {
return errors.New(fmt.Sprintf("UnmarshalBinary : store.setmapEntry nil"))
}
b := bytes.NewBuffer(data)
//UnMarshal mapEntry
var len int = 0
_, err := fmt.Fscanln(b, &len)
if err != nil {
return errors.New(fmt.Sprintf("UnmarshalBinary : mapEntry len nil"))
}
for i:= 0 ; i<len; i++ {
var key string
var value string
var e int64
_, err = fmt.Fscanln(b, &key)
if err != nil {
return errors.New(fmt.Sprintf("UnmarshalBinary : mapEntry key nil"))
}
_, err = fmt.Fscanln(b, &value)
if err != nil {
return errors.New(fmt.Sprintf("UnmarshalBinary : mapEntry val nil"))
}
_, err = fmt.Fscanln(b, &e)
if err != nil {
return errors.New(fmt.Sprintf("UnmarshalBinary : mapEntry expiration nil"))
}
mapEntry := &mapData{
val: value,
Expiration: e,
lock: &sync.RWMutex{},
}
//UnMarshal mapData.lock skipped - not required
store.mapEntry[key] = mapEntry
}
//UnMarshal setmapEntry
len = 0
_, err = fmt.Fscanln(b, &len)
if err != nil {
return errors.New(fmt.Sprintf("UnmarshalBinary : setmapEntry len nil"))
}
for i:= 0 ; i<len; i++ {
var key string
var len2 int
var key2 int
_, err = fmt.Fscanln(b, &key)
if err != nil {
return errors.New(fmt.Sprintf("UnmarshalBinary : setmapEntry key nil"))
}
_, err = fmt.Fscanln(b, &len2)
if err != nil {
return errors.New(fmt.Sprintf("UnmarshalBinary : setmapEntry key : %v setEntry len2 nil", key))
}
setmapEntry := &setmapData{
setEntry: make(map[int]*treeset.Set),
lock: &sync.RWMutex{},
}
for k:=0; k<len2; k++ {
_, err = fmt.Fscanln(b, &key2)
if err != nil {
return errors.New(fmt.Sprintf("UnmarshalBinary : setmapEntry key : %v setEntry len2 : %v key nil", key, len2))
}
setmapEntry.setEntry[key2] = treeset.NewWithStringComparator()
var setlen int = 0
_, err = fmt.Fscanln(b, &setlen)
if err != nil {
return errors.New(fmt.Sprintf("UnmarshalBinary : setmapEntry key : %v setEntry len nil", key))
}
for j:=0; j< setlen; j++ {
var val string
_, err = fmt.Fscanln(b, &val)
if err != nil {
return errors.New(fmt.Sprintf("UnmarshalBinary : setmapEntry key : %v setEntry len : %v key2 : %v value nil for cursetIndex : %v ", key, setlen, key2, j))
}
setmapEntry.setEntry[key2].Add(val)
}
}
//UnMarshal setmapData.lock skipped - not required
store.setmapEntry[key] = setmapEntry
}
//UnMarshal setmapDBLock skipped - not required
return err
}