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simple_db.go
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simple_db.go
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package database
import (
"github.com/iost-official/go-iost/account"
"os"
"io/ioutil"
"encoding/json"
"strings"
"fmt"
"errors"
"github.com/bitly/go-simplejson"
"github.com/iost-official/go-iost/core/block"
"github.com/iost-official/go-iost/core/contract"
"github.com/iost-official/go-iost/core/tx"
"github.com/iost-official/go-iost/crypto"
)
// SimpleDB implements simple database interface
type SimpleDB struct {
json *simplejson.Json
}
// NewDatabase returns a SimpleDB with empty data and system contract
func NewDatabase() *SimpleDB {
var data SimpleDB
data.json = simplejson.New()
return &data
}
// NewDatabaseFromPath returns a SimpleDB with data loaded from json file
func NewDatabaseFromPath(path string) *SimpleDB {
var data SimpleDB
json, err := readJSON(path)
if err != nil {
return nil
}
data.json = json
return &data
}
// Get key-value from db with marshal
func (d *SimpleDB) Get(table string, key string) (string, error) {
jso := d.json.Get(key)
var out interface{}
var err error
if jso.Interface() == nil {
out = nil
} else {
switch jso.Interface().(type) {
case json.Number:
out, err = jso.Int64()
case string:
out, err = jso.String()
case bool:
out, err = jso.Bool()
}
}
if err != nil {
return "", err
}
if strings.HasPrefix(key, "c-") {
if out == nil {
return "", errors.New("key not exists")
}
return out.(string), nil
}
return Marshal(out)
}
// Put key-value into db with unmarshal
func (d *SimpleDB) Put(table string, key string, value string) error {
if strings.HasPrefix(key, "c-") {
d.json.Set(key, value)
} else {
d.json.Set(key, MustUnmarshal(value))
}
return nil
}
// Del delete key from db
func (d *SimpleDB) Del(table string, key string) error {
d.json.Del(key)
return nil
}
// Has return if key exists in db
func (d *SimpleDB) Has(table string, key string) (bool, error) {
_, ok := d.json.CheckGet(key)
return ok, nil
}
// Keys do nothing
func (d *SimpleDB) Keys(table string, prefix string) ([]string, error) {
return nil, nil
}
// Save save db data to json file
func (d *SimpleDB) Save(path string) error {
d.json.Del("c-system.iost")
f, err := os.Create(path)
if err != nil {
return err
}
buf, err := d.json.EncodePretty()
if err != nil {
return err
}
_, err = f.Write(buf)
if err != nil {
return err
}
err = f.Close()
return err
}
// Load load db data from json file
func (d *SimpleDB) Load(path string) error {
var err error
d.json, err = readJSON(path)
if err != nil {
return err
}
return nil
}
// LoadBlockhead load block info as block.BlockHead from json file
func LoadBlockhead(path string) (*block.BlockHead, error) {
json, err := readJSON(path)
if err != nil {
return nil, err
}
bh := &block.BlockHead{}
bh.Time, err = json.Get("time").Int64()
if err != nil {
return nil, err
}
bh.ParentHash, err = json.Get("parent_hash").Bytes()
if err != nil {
return nil, err
}
bh.Number, err = json.Get("number").Int64()
if err != nil {
return nil, err
}
bh.Witness, err = json.Get("witness").String()
if err != nil {
return nil, err
}
return bh, nil
}
// LoadTxInfo load tx info as tx.Tx from json file
func LoadTxInfo(path string) (*tx.Tx, error) {
json, err := readJSON(path)
if err != nil {
return nil, err
}
t := &tx.Tx{}
s := make([]string, 0)
for _, v := range json.Get("signers").MustArray() {
s = append(s, v.(string))
}
t.Signers = s
p, err := json.Get("publisher").String()
if err != nil {
return nil, err
}
t.PublishSigns = append(t.PublishSigns, &crypto.Signature{
Pubkey: account.DecodePubkey(p),
})
t.GasLimit, err = json.Get("gas_limit").Int64()
if err != nil {
return nil, err
}
t.GasRatio, err = json.Get("gas_ratio").Int64()
if err != nil {
return nil, err
}
return t, nil
}
func readJSON(path string) (*simplejson.Json, error) {
f, err := os.Open(path)
if err != nil {
return nil, err
}
fd, err := ioutil.ReadAll(f)
if err != nil {
return nil, err
}
return simplejson.NewJson(fd)
}
// AddSystem load system contract and data from json file
func (d *SimpleDB) AddSystem(path string) {
cp := contract.Compiler{}
f, err := os.Open(path)
if err != nil {
panic(err)
}
fd, err := ioutil.ReadAll(f)
if err != nil {
panic(err)
}
c, err := cp.Parse("system.iost", "", string(fd))
if err != nil {
panic(err)
}
fmt.Println(c)
d.json.Set("c-system.iost", c.Encode())
}
// Commit do nothing
func (d *SimpleDB) Commit() {
}
// Rollback do nothing
func (d *SimpleDB) Rollback() {
}