op-chain-ops: read l2 addrs from json file

There is now a new config flag for reading the L2Addresses
from disk. Note that the name L2Addresses should probably be
changed or migrated into the `DeployConfig` because now we
have overlapping sources of config.

There are deployment deps that would also need to be changed, so
doing the config change would require PRs across multiple repos.

The `sdk` tasks also consume a JSON file with addresses and this JSON
is different than that JSON which is not ideal.

op-chain-ops/cmd/migrate/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"errors"
 	"math/big"
 	"os"
 	"path/filepath"
@@ -12,7 +13,6 @@ import (
 	"github.com/ethereum-optimism/optimism/op-chain-ops/genesis"
 
 	op_state "github.com/ethereum-optimism/optimism/op-chain-ops/state"
-	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/ethclient"
 
 	"github.com/mattn/go-isatty"
@@ -55,6 +55,10 @@ func main() {
 				Name:  "evm-messages",
 				Usage: "Path to evm-messages.json",
 			},
+			&cli.StringFlag{
+				Name:  "l2-addresses",
+				Usage: "Path to l2-addresses.json",
+			},
 			&cli.StringFlag{
 				Name:  "db-path",
 				Usage: "Path to database",
@@ -104,6 +108,11 @@ func main() {
 				EvmMessages:   evmMessages,
 			}
 
+			l2Addrs, err := genesis.NewL2Addresses(ctx.String("l2-addresses"))
+			if err != nil {
+				return err
+			}
+
 			l1RpcURL := ctx.String("l1-rpc-url")
 			l1Client, err := ethclient.Dial(l1RpcURL)
 			if err != nil {
@@ -142,15 +151,14 @@ func main() {
 				return err
 			}
 
-			l2Addrs := genesis.L2Addresses{
-				ProxyAdminOwner: config.ProxyAdminOwner,
-				// TODO: these values are not in the config
-				L1StandardBridgeProxy:       common.Address{},
-				L1CrossDomainMessengerProxy: common.Address{},
-				L1ERC721BridgeProxy:         common.Address{},
+			// TODO: think about optimal config, there are a lot of deps
+			// regarding changing this
+			if config.ProxyAdminOwner != l2Addrs.ProxyAdminOwner {
+				return errors.New("mismatched ProxyAdminOwner config")
+
 			}
 
-			if err := genesis.MigrateDB(wrappedDB, config, block, &l2Addrs, &migrationData); err != nil {
+			if err := genesis.MigrateDB(wrappedDB, config, block, l2Addrs, &migrationData); err != nil {
 				return err
 			}
 

op-chain-ops/genesis/layer_two.go

 package genesis
 
 import (
+	"encoding/json"
+	"fmt"
+	"os"
+
 	"github.com/ethereum-optimism/optimism/op-bindings/predeploys"
 	"github.com/ethereum-optimism/optimism/op-chain-ops/state"
 	"github.com/ethereum/go-ethereum/common"
@@ -12,10 +16,25 @@ import (
 // L2Addresses represents L1 contract addresses
 // that are required for the construction of an L2 state
 type L2Addresses struct {
-	ProxyAdminOwner             common.Address
-	L1StandardBridgeProxy       common.Address
-	L1CrossDomainMessengerProxy common.Address
-	L1ERC721BridgeProxy         common.Address
+	ProxyAdminOwner             common.Address `json:"proxyAdminOwner"`
+	L1StandardBridgeProxy       common.Address `json:"l1StandardBridgeProxy"`
+	L1CrossDomainMessengerProxy common.Address `json:"l1CrossDomainMessengerProxy"`
+	L1ERC721BridgeProxy         common.Address `json:"l1ERC721BridgeProxy"`
+}
+
+// NewL2Addresses will read the L2Addresses from a json file on disk
+func NewL2Addresses(path string) (*L2Addresses, error) {
+	file, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("cannot find L2Addresses json at %s: %w", path, err)
+	}
+
+	var addrs L2Addresses
+	if err := json.Unmarshal(file, &addrs); err != nil {
+		return nil, err
+	}
+
+	return &addrs, nil
 }
 
 // BuildL2DeveloperGenesis will build the developer Optimism Genesis