cmd/devp2p: pass test parameters as flags instead of args

CLIs with multiple positional parameters are kind of hard to use.

cmd/devp2p/rlpxcmd.go

@@ -24,6 +24,7 @@ import (
 	"github.com/ethereum/go-ethereum/cmd/devp2p/internal/ethtest"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/p2p"
+	"github.com/ethereum/go-ethereum/p2p/enode"
 	"github.com/ethereum/go-ethereum/p2p/rlpx"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/urfave/cli/v2"
@@ -46,22 +47,28 @@ var (
 	}
 	rlpxEthTestCommand = &cli.Command{
 		Name:      "eth-test",
-		Usage:     "Runs tests against a node",
+		Usage:     "Runs eth protocol tests against a node",
-		ArgsUsage: "<node> <chain.rlp> <genesis.json>",
+		ArgsUsage: "<node>",
 		Action:    rlpxEthTest,
 		Flags: []cli.Flag{
 			testPatternFlag,
 			testTAPFlag,
+			testChainDirFlag,
+			testNodeJWTFlag,
+			testNodeEngineFlag,
 		},
 	}
 	rlpxSnapTestCommand = &cli.Command{
 		Name:      "snap-test",
-		Usage:     "Runs tests against a node",
+		Usage:     "Runs snap protocol tests against a node",
-		ArgsUsage: "<node> <chain.rlp> <genesis.json>",
+		ArgsUsage: "<node>",
 		Action:    rlpxSnapTest,
 		Flags: []cli.Flag{
 			testPatternFlag,
 			testTAPFlag,
+			testChainDirFlag,
+			testNodeJWTFlag,
+			testNodeEngineFlag,
 		},
 	}
 )
@@ -103,10 +110,8 @@ func rlpxPing(ctx *cli.Context) error {
 
 // rlpxEthTest runs the eth protocol test suite.
 func rlpxEthTest(ctx *cli.Context) error {
-	if ctx.NArg() < 3 {
+	p := cliTestParams(ctx)
-		exit("missing path to chain.rlp as command-line argument")
+	suite, err := ethtest.NewSuite(p.node, p.chainDir, p.engineAPI, p.jwt)
-	}
-	suite, err := ethtest.NewSuite(getNodeArg(ctx), ctx.Args().Get(1), ctx.Args().Get(2), ctx.Args().Get(3))
 	if err != nil {
 		exit(err)
 	}
@@ -115,12 +120,36 @@ func rlpxEthTest(ctx *cli.Context) error {
 
 // rlpxSnapTest runs the snap protocol test suite.
 func rlpxSnapTest(ctx *cli.Context) error {
-	if ctx.NArg() < 3 {
+	p := cliTestParams(ctx)
-		exit("missing path to chain.rlp as command-line argument")
+	suite, err := ethtest.NewSuite(p.node, p.chainDir, p.engineAPI, p.jwt)
-	}
-	suite, err := ethtest.NewSuite(getNodeArg(ctx), ctx.Args().Get(1), ctx.Args().Get(2), ctx.Args().Get(3))
 	if err != nil {
 		exit(err)
 	}
 	return runTests(ctx, suite.SnapTests())
 }
+
+type testParams struct {
+	node      *enode.Node
+	engineAPI string
+	jwt       string
+	chainDir  string
+}
+
+func cliTestParams(ctx *cli.Context) *testParams {
+	p := testParams{
+		node:      getNodeArg(ctx),
+		engineAPI: ctx.String(testNodeEngineFlag.Name),
+		jwt:       ctx.String(testNodeJWTFlag.Name),
+		chainDir:  ctx.String(testChainDirFlag.Name),
+	}
+	if p.engineAPI == "" {
+		exit(fmt.Errorf("missing -%s", testNodeEngineFlag.Name))
+	}
+	if p.jwt == "" {
+		exit(fmt.Errorf("missing -%s", testNodeJWTFlag.Name))
+	}
+	if p.chainDir == "" {
+		exit(fmt.Errorf("missing -%s", testChainDirFlag.Name))
+	}
+	return &p
+}

cmd/devp2p/runtest.go

@@ -34,6 +34,21 @@ var (
 		Name:  "tap",
 		Usage: "Output TAP",
 	}
+
+	// for eth/snap tests
+	testChainDirFlag = &cli.StringFlag{
+		Name:  "chain",
+		Usage: "Test chain directory",
+	}
+	testNodeJWTFlag = &cli.StringFlag{
+		Name:  "jwt",
+		Usage: "JWT for talking to the engine API of the test node",
+	}
+	testNodeEngineFlag = &cli.StringFlag{
+		Name:  "engineapi",
+		Usage: "Engine API endpoint of the test node",
+	}
+
 	// These two are specific to the discovery tests.
 	testListen1Flag = &cli.StringFlag{
 		Name:  "listen1",