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Add option to pull Chain Configs in parent.go from a json file #3856

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Add option to pull Chain Configs in parent.go from a json file #3856

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7ef4437
Add option to pull Chain Configs in parent.go from a json file
amsanghi Oct 16, 2025
d721db8
fix file
amsanghi Oct 16, 2025
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1 change: 1 addition & 0 deletions arbnode/parent/chain_config.json
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
[]
21 changes: 21 additions & 0 deletions arbnode/parent/parent.go
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Expand Up @@ -6,6 +6,9 @@ package parent

import (
"context"
_ "embed"
"encoding/json"
"fmt"
"math/big"

"github.com/ethereum/go-ethereum/consensus/misc/eip4844"
Expand All @@ -15,6 +18,10 @@ import (
"github.com/offchainlabs/nitro/util/headerreader"
)

// knownConfigs maps known Ethereum chain IDs to their chain configurations.
// Note that this is not exhaustive; users can add more configurations via
// chain_config.json files or can even override existing known configurations by providing
// the same chain ID.
var (
knownConfigs = map[uint64]*params.ChainConfig{
params.MainnetChainConfig.ChainID.Uint64(): params.MainnetChainConfig,
Expand All @@ -24,6 +31,20 @@ var (
}
)

//go:embed chain_config.json
var DefaultChainsConfigBytes []byte

func init() {
var chainsConfig []*params.ChainConfig
err := json.Unmarshal(DefaultChainsConfigBytes, &chainsConfig)
if err != nil {
panic(fmt.Errorf("error marshalling default chainsConfig: %w", err))
}
for _, chainConfig := range chainsConfig {
knownConfigs[chainConfig.ChainID.Uint64()] = chainConfig
}
}

type ParentChain struct {
ChainID *big.Int
L1Reader *headerreader.HeaderReader
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