Introduces configuration setup to the op-challenger service as similar

as possible to the op-proposer service.

op-challenger/challenger/config.go

+package challenger
+
+import (
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/ethclient"
+	"github.com/urfave/cli"
+
+	flags "github.com/ethereum-optimism/optimism/op-challenger/flags"
+	sources "github.com/ethereum-optimism/optimism/op-node/sources"
+
+	oplog "github.com/ethereum-optimism/optimism/op-service/log"
+	opmetrics "github.com/ethereum-optimism/optimism/op-service/metrics"
+	oppprof "github.com/ethereum-optimism/optimism/op-service/pprof"
+	oprpc "github.com/ethereum-optimism/optimism/op-service/rpc"
+	txmgr "github.com/ethereum-optimism/optimism/op-service/txmgr"
+)
+
+// Config contains the well typed fields that are used to initialize the challenger.
+// It is intended for programmatic use.
+type Config struct {
+	L2OutputOracleAddr common.Address
+	DisputeGameFactory common.Address
+	NetworkTimeout     time.Duration
+	TxManager          txmgr.TxManager
+	L1Client           *ethclient.Client
+	RollupClient       *sources.RollupClient
+}
+
+// CLIConfig is a well typed config that is parsed from the CLI params.
+// This also contains config options for auxiliary services.
+// It is transformed into a `Config` before the Challenger is started.
+type CLIConfig struct {
+	// L1EthRpc is the HTTP provider URL for L1.
+	L1EthRpc string
+
+	// RollupRpc is the HTTP provider URL for the rollup node.
+	RollupRpc string
+
+	// L2OOAddress is the L2OutputOracle contract address.
+	L2OOAddress string
+
+	// DGFAddress is the DisputeGameFactory contract address.
+	DGFAddress string
+
+	TxMgrConfig txmgr.CLIConfig
+
+	RPCConfig oprpc.CLIConfig
+
+	LogConfig oplog.CLIConfig
+
+	MetricsConfig opmetrics.CLIConfig
+
+	PprofConfig oppprof.CLIConfig
+}
+
+func (c CLIConfig) Check() error {
+	if err := c.RPCConfig.Check(); err != nil {
+		return err
+	}
+	if err := c.LogConfig.Check(); err != nil {
+		return err
+	}
+	if err := c.MetricsConfig.Check(); err != nil {
+		return err
+	}
+	if err := c.PprofConfig.Check(); err != nil {
+		return err
+	}
+	if err := c.TxMgrConfig.Check(); err != nil {
+		return err
+	}
+	return nil
+}
+
+// NewConfig parses the Config from the provided flags or environment variables.
+func NewConfig(ctx *cli.Context) CLIConfig {
+	return CLIConfig{
+		// Required Flags
+		L1EthRpc:    ctx.GlobalString(flags.L1EthRpcFlag.Name),
+		RollupRpc:   ctx.GlobalString(flags.RollupRpcFlag.Name),
+		L2OOAddress: ctx.GlobalString(flags.L2OOAddressFlag.Name),
+		DGFAddress:  ctx.GlobalString(flags.DGFAddressFlag.Name),
+		TxMgrConfig: txmgr.ReadCLIConfig(ctx),
+		// Optional Flags
+		RPCConfig:     oprpc.ReadCLIConfig(ctx),
+		LogConfig:     oplog.ReadCLIConfig(ctx),
+		MetricsConfig: opmetrics.ReadCLIConfig(ctx),
+		PprofConfig:   oppprof.ReadCLIConfig(ctx),
+	}
+}