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genesis_util.go
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genesis_util.go
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package core
import (
"encoding/json"
"fmt"
"io/ioutil"
"math/big"
"sort"
"github.com/ethereum/go-ethereum/rlp"
)
// GenesisItem represents one genesis block transaction
type GenesisItem struct {
Addr *big.Int
Balance *big.Int
}
// genesisConfig is a format compatible with genesis_block.json file
type genesisConfig map[string]map[string]string
func encodeGenesisConfig(ga []GenesisItem) string {
by, err := rlp.EncodeToBytes(ga)
if err != nil {
panic("ops")
}
return string(by)
}
func parseGenesisConfigFile(fileName string) genesisConfig {
input, err := ioutil.ReadFile(fileName)
if err != nil {
panic(fmt.Sprintf("cannot open genesisblock config file %v, err %v\n", fileName, err))
}
var gc genesisConfig
err = json.Unmarshal(input, &gc)
if err != nil {
panic(fmt.Sprintf("cannot parse json file %v, err %v\n", fileName, err))
}
return gc
}
// StringToBigInt converts a string to BigInt
func StringToBigInt(s string, base int) *big.Int {
z := new(big.Int)
z, ok := z.SetString(s, base)
if !ok {
panic(fmt.Sprintf("%v cannot convert to bigint with base %v", s, base))
}
return z
}
func convertToGenesisItems(gc genesisConfig) []GenesisItem {
gi := []GenesisItem{}
for k, v := range gc {
gi = append(gi, GenesisItem{StringToBigInt(k, 16), StringToBigInt(v["nano"], 10)})
}
sort.Slice(gi, func(i, j int) bool {
return gi[i].Addr.Cmp(gi[j].Addr) == -1
})
return gi
}
// EncodeGenesisConfig converts json file into binary format for genesis block
func EncodeGenesisConfig(fileName string) string {
gc := parseGenesisConfigFile(fileName)
gi := convertToGenesisItems(gc)
by := encodeGenesisConfig(gi)
return string(by)
}