laconicd/types/chain_id.go

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package types
import (
"fmt"
"math/big"
"regexp"
"strings"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
tmrand "github.com/tendermint/tendermint/libs/rand"
)
var (
regexChainID = `[a-z]*`
regexSeparator = `-{1}`
regexEpoch = `[1-9][0-9]*`
ethermintChainID = regexp.MustCompile(fmt.Sprintf(`^(%s)%s(%s)$`, regexChainID, regexSeparator, regexEpoch))
)
// IsValidChainID returns false if the given chain identifier is incorrectly formatted.
func IsValidChainID(chainID string) bool {
if len(chainID) > 48 {
return false
}
return ethermintChainID.MatchString(chainID)
}
// ParseChainID parses a string chain identifier's epoch to an Ethereum-compatible
// chain-id in *big.Int format. The function returns an error if the chain-id has an invalid format
func ParseChainID(chainID string) (*big.Int, error) {
chainID = strings.TrimSpace(chainID)
if len(chainID) > 48 {
return nil, sdkerrors.Wrapf(ErrInvalidChainID, "chain-id '%s' cannot exceed 48 chars", chainID)
}
matches := ethermintChainID.FindStringSubmatch(chainID)
if matches == nil || len(matches) != 3 || matches[1] == "" {
return nil, sdkerrors.Wrap(ErrInvalidChainID, chainID)
}
// verify that the chain-id entered is a base 10 integer
chainIDInt, ok := new(big.Int).SetString(matches[2], 10)
if !ok {
return nil, sdkerrors.Wrapf(ErrInvalidChainID, "epoch %s must be base-10 integer format", matches[2])
}
return chainIDInt, nil
}
// GenerateRandomChainID returns a random chain-id in the valid format.
func GenerateRandomChainID() string {
return fmt.Sprintf("ethermint-%d", 10+tmrand.Intn(10000))
}