forked from Consensys/quorum
/
data_handler.go
55 lines (44 loc) · 1.41 KB
/
data_handler.go
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package extension
import (
"encoding/json"
"io/ioutil"
"os"
"path/filepath"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/log"
)
const extensionContractData = "activeExtensions.json"
type DataHandler interface {
Load() (map[common.Address]*ExtensionContract, error)
Save(extensionContracts map[common.Address]*ExtensionContract) error
}
type JsonFileDataHandler struct {
saveFile string
}
func NewJsonFileDataHandler(dataDirectory string) *JsonFileDataHandler {
return &JsonFileDataHandler{
saveFile: filepath.Join(dataDirectory, extensionContractData),
}
}
func (handler *JsonFileDataHandler) Load() (map[common.Address]*ExtensionContract, error) {
currentContracts := make(map[common.Address]*ExtensionContract)
if _, err := os.Stat(handler.saveFile); err == nil || !os.IsNotExist(err) {
blob, err := ioutil.ReadFile(handler.saveFile)
if err != nil {
return nil, err
}
if err = json.Unmarshal(blob, ¤tContracts); err != nil {
return nil, err
}
}
return currentContracts, nil
}
func (handler *JsonFileDataHandler) Save(extensionContracts map[common.Address]*ExtensionContract) error {
//no unmarshallable types, so can't error
output, _ := json.Marshal(&extensionContracts)
if errSaving := ioutil.WriteFile(handler.saveFile, output, 0644); errSaving != nil {
log.Error("Couldn't save outstanding extension contract details")
return errSaving
}
return nil
}