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parse.go
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parse.go
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package utils
import (
"encoding/json"
"errors"
"io/ioutil"
"os"
"reflect"
"github.com/ethereum/go-ethereum/core"
gen "github.com/CyberMiles/travis/misc/genesis"
"github.com/CyberMiles/travis/utils"
)
var blankGenesis = new(core.Genesis)
var errBlankGenesis = errors.New("could not parse a valid/non-blank Genesis")
// ParseGenesisOrDefault tries to read the content from provided
// genesisPath. If the path is empty or doesn't exist, it will
// use defaultGenesisBytes as the fallback genesis source. Otherwise,
// it will open that path and if it encounters an error that doesn't
// satisfy os.IsNotExist, it returns that error.
func ParseGenesisOrDefault(genesisPath string, chainID uint) (*core.Genesis, error) {
var genesisBlob []byte
var err error
if chainID == utils.MainNet {
genesisBlob, err = gen.DefaultGenesisBlock().MarshalJSON();
} else {
genesisBlob, err = gen.DevGenesisBlock().MarshalJSON()
}
if err != nil {
return nil, err
}
if len(genesisPath) > 0 {
blob, err := ioutil.ReadFile(genesisPath)
if err != nil && !os.IsNotExist(err) {
return nil, err
}
if len(blob) >= 2 { // Expecting atleast "{}"
genesisBlob = blob
}
}
genesis := new(core.Genesis)
if err := json.Unmarshal(genesisBlob, genesis); err != nil {
return nil, err
}
if reflect.DeepEqual(blankGenesis, genesis) {
return nil, errBlankGenesis
}
return genesis, nil
}