add --contender.arg flag

main.go

@@ -31,6 +31,7 @@ var labels playground.MapStringFlag
 var disableLogs bool
 var platform string
 var contenderEnabled bool
+var contenderArgs []string
 
 var rootCmd = &cobra.Command{
 	Use:   "playground",
@@ -181,6 +182,7 @@ func main() {
 		recipeCmd.Flags().BoolVar(&disableLogs, "disable-logs", false, "disable logs")
 		recipeCmd.Flags().StringVar(&platform, "platform", "", "docker platform to use")
 		recipeCmd.Flags().BoolVar(&contenderEnabled, "contender", false, "spam nodes with contender")
+		recipeCmd.Flags().StringArrayVar(&contenderArgs, "contender.arg", []string{}, "add/override contender CLI flags")
 
 		cookCmd.AddCommand(recipeCmd)
 	}
@@ -226,7 +228,14 @@ func runIt(recipe playground.Recipe) error {
 		return err
 	}
 
-	svcManager := recipe.Apply(&playground.ExContext{LogLevel: logLevel, ContenderEnabled: contenderEnabled}, artifacts)
+	// if contender.tps is set, assume contender is enabled
+	svcManager := recipe.Apply(&playground.ExContext{
+		LogLevel: logLevel,
+		Contender: &playground.ContenderContext{
+			Enabled:   contenderEnabled,
+			ExtraArgs: contenderArgs,
+		},
+	}, artifacts)
 	if err := svcManager.Validate(); err != nil {
 		return fmt.Errorf("failed to validate manifest: %w", err)
 	}

playground/components.go

@@ -101,8 +101,8 @@ func (o *OpRbuilder) Name() string {
 
 type FlashblocksRPC struct {
 	FlashblocksWSService string
-	BaseOverlay bool
-	UseWebsocketProxy bool  // Whether to add /ws path for websocket proxy
+	BaseOverlay          bool
+	UseWebsocketProxy    bool // Whether to add /ws path for websocket proxy
 }
 
 func (f *FlashblocksRPC) Run(service *Service, ctx *ExContext) {
@@ -130,19 +130,19 @@ func (f *FlashblocksRPC) Run(service *Service, ctx *ExContext) {
 			)
 	}
 	service.WithArgs(
-			"--authrpc.port", `{{Port "authrpc" 8551}}`,
-			"--authrpc.addr", "0.0.0.0",
-			"--authrpc.jwtsecret", "/data/jwtsecret",
-			"--http",
-			"--http.addr", "0.0.0.0",
-			"--http.port", `{{Port "http" 8545}}`,
-			"--chain", "/data/l2-genesis.json",
-			"--datadir", "/data_op_reth",
-			"--disable-discovery",
-			"--color", "never",
-			"--metrics", `0.0.0.0:{{Port "metrics" 9090}}`,
-			"--port", `{{Port "rpc" 30303}}`,
-		).
+		"--authrpc.port", `{{Port "authrpc" 8551}}`,
+		"--authrpc.addr", "0.0.0.0",
+		"--authrpc.jwtsecret", "/data/jwtsecret",
+		"--http",
+		"--http.addr", "0.0.0.0",
+		"--http.port", `{{Port "http" 8545}}`,
+		"--chain", "/data/l2-genesis.json",
+		"--datadir", "/data_op_reth",
+		"--disable-discovery",
+		"--color", "never",
+		"--metrics", `0.0.0.0:{{Port "metrics" 9090}}`,
+		"--port", `{{Port "rpc" 30303}}`,
+	).
 		WithArtifact("/data/jwtsecret", "jwtsecret").
 		WithArtifact("/data/l2-genesis.json", "l2-genesis.json").
 		WithVolume("data", "/data_flashblocks_rpc")
@@ -159,13 +159,13 @@ func (f *FlashblocksRPC) Name() string {
 }
 
 type BProxy struct {
-	TargetAuthrpc string
-	Peers []string
-	Flashblocks bool
+	TargetAuthrpc         string
+	Peers                 []string
+	Flashblocks           bool
 	FlashblocksBuilderURL string
 }
 
-func (f* BProxy) Run(service *Service, ctx *ExContext) {
+func (f *BProxy) Run(service *Service, ctx *ExContext) {
 	peers := []string{}
 	for _, peer := range f.Peers {
 		peers = append(peers, Connect(peer, "authrpc"))
@@ -813,20 +813,110 @@ func (n *nullService) Name() string {
 }
 
 type Contender struct {
+	ExtraArgs []string
 }
 
 func (c *Contender) Name() string {
 	return "contender"
 }
 
+// parse "key=value" OR "key value"; remainder after first space is the value (may contain spaces)
+func parseKV(s string) (name, val string, hasVal, usedEq bool) {
+	s = strings.TrimSpace(s)
+	if s == "" {
+		return "", "", false, false
+	}
+	eq := strings.IndexByte(s, '=')
+	ws := indexWS(s)
+
+	// prefer '=' if it appears before any whitespace
+	if eq > 0 && (ws == -1 || eq < ws) {
+		return strings.TrimSpace(s[:eq]), strings.TrimSpace(s[eq+1:]), true, true
+	}
+	if ws == -1 {
+		return s, "", false, false
+	}
+	return strings.TrimSpace(s[:ws]), strings.TrimSpace(s[ws+1:]), true, false
+}
+
+func indexWS(s string) int {
+	for i, r := range s {
+		if r == ' ' || r == '\t' {
+			return i
+		}
+	}
+	return -1
+}
+
 func (c *Contender) Run(service *Service, ctx *ExContext) {
-	args := []string{
-		"spam",
-		"-l",                        // loop indefinitely
-		"--min-balance", "10 ether", // give each spammer 10 ether (sender must have 100 ether because default number of spammers is 10)
-		"-r", Connect("el", "http"), // connect to whatever EL node is available
-		"--tps", "20", // send 20 txs per second
+	type opt struct {
+		name   string
+		val    string
+		hasVal bool
+	}
+	defaults := []opt{
+		{name: "-l"},
+		{name: "--min-balance", val: "10 ether", hasVal: true},
+		{name: "-r", val: Connect("el", "http"), hasVal: true},
+		{name: "--tps", val: "20", hasVal: true},
+	}
+
+	// Parse extras and track seen flags
+	type extra struct {
+		name   string
+		val    string
+		hasVal bool
+		usedEq bool
+	}
+	var extras []extra
+	seen := map[string]bool{}
+
+	for _, s := range c.ExtraArgs {
+		name, val, hasVal, usedEq := parseKV(s)
+		if name == "" {
+			continue
+		}
+		extras = append(extras, extra{name, val, hasVal, usedEq})
+		seen[name] = true
+	}
+
+	// Minimal conflict example: --loops overrides default "-l"
+	conflict := func(flag string) bool {
+		if seen[flag] {
+			return true
+		}
+		if flag == "-l" && seen["--loops"] {
+			return true
+		}
+		return false
 	}
+
+	args := []string{"spam"}
+
+	// Add defaults unless overridden
+	for _, d := range defaults {
+		if conflict(d.name) {
+			continue
+		}
+		args = append(args, d.name)
+		if d.hasVal {
+			args = append(args, d.val)
+		}
+	}
+
+	// Append extras verbatim, preserving "=" vs space
+	for _, e := range extras {
+		if !e.hasVal {
+			args = append(args, e.name)
+			continue
+		}
+		if e.usedEq {
+			args = append(args, e.name+"="+e.val)
+		} else {
+			args = append(args, e.name, e.val)
+		}
+	}
+
 	service.WithImage("flashbots/contender").
 		WithTag("latest").
 		WithArgs(args...).

playground/manifest.go

@@ -70,6 +70,14 @@ func (l *LogLevel) Unmarshal(s string) error {
 	return nil
 }
 
+type ContenderContext struct {
+	// Run `contender spam` automatically once all playground services are running.
+	Enabled bool
+
+	// Provide additional args to contender's CLI
+	ExtraArgs []string
+}
+
 // Execution context
 type ExContext struct {
 	LogLevel LogLevel
@@ -83,7 +91,7 @@ type ExContext struct {
 	// TODO: Extend for CL nodes too
 	Bootnode *BootnodeRef
 
-	ContenderEnabled bool
+	Contender *ContenderContext
 }
 
 type BootnodeRef struct {

playground/recipe_buildernet.go

@@ -59,8 +59,10 @@ func (b *BuilderNetRecipe) Apply(ctx *ExContext, artifacts *Artifacts) *Manifest
 		})
 	}
 
-	if ctx.ContenderEnabled {
-		svcManager.AddService("contender", &Contender{})
+	if ctx.Contender.Enabled {
+		svcManager.AddService("contender", &Contender{
+			ExtraArgs: ctx.Contender.ExtraArgs,
+		})
 	}
 
 	return svcManager

playground/recipe_l1.go

@@ -107,8 +107,10 @@ func (l *L1Recipe) Apply(ctx *ExContext, artifacts *Artifacts) *Manifest {
 		})
 	}
 
-	if ctx.ContenderEnabled {
-		svcManager.AddService("contender", &Contender{})
+	if ctx.Contender.Enabled {
+		svcManager.AddService("contender", &Contender{
+			ExtraArgs: ctx.Contender.ExtraArgs,
+		})
 	}
 
 	return svcManager

playground/recipe_opstack.go

@@ -32,7 +32,7 @@ type OpRecipe struct {
 	flashblocksBuilderURL string
 
 	// Indicates that flashblocks-rpc should use base image
-	baseOverlay bool 
+	baseOverlay bool
 
 	// whether to enable websocket proxy
 	enableWebsocketProxy bool
@@ -108,13 +108,13 @@ func (o *OpRecipe) Apply(ctx *ExContext, artifacts *Artifacts) *Manifest {
 	if o.flashblocks {
 		peers = append(peers, "flashblocks-rpc")
 	}
-	
+
 	// Only enable bproxy if flashblocks is enabled (since flashblocks-rpc is the only service that needs it)
 	if o.flashblocks {
 		svcManager.AddService("bproxy", &BProxy{
-			TargetAuthrpc: externalBuilderRef,
-			Peers: peers,
-			Flashblocks: o.flashblocks,
+			TargetAuthrpc:         externalBuilderRef,
+			Peers:                 peers,
+			Flashblocks:           o.flashblocks,
 			FlashblocksBuilderURL: flashblocksBuilderURLRef,
 		})
 	}
@@ -146,7 +146,6 @@ func (o *OpRecipe) Apply(ctx *ExContext, artifacts *Artifacts) *Manifest {
 		})
 	}
 
-
 	if o.flashblocks {
 		// Determine which service to use for flashblocks websocket connection
 		flashblocksWSService := "rollup-boost"
@@ -158,8 +157,8 @@ func (o *OpRecipe) Apply(ctx *ExContext, artifacts *Artifacts) *Manifest {
 
 		svcManager.AddService("flashblocks-rpc", &FlashblocksRPC{
 			FlashblocksWSService: flashblocksWSService,
-			BaseOverlay: o.baseOverlay,
-			UseWebsocketProxy: useWebsocketProxy,
+			BaseOverlay:          o.baseOverlay,
+			UseWebsocketProxy:    useWebsocketProxy,
 		})
 	}
 
@@ -176,8 +175,10 @@ func (o *OpRecipe) Apply(ctx *ExContext, artifacts *Artifacts) *Manifest {
 		MaxChannelDuration: o.batcherMaxChannelDuration,
 	})
 
-	if ctx.ContenderEnabled {
-		svcManager.AddService("contender", &Contender{})
+	if ctx.Contender.Enabled {
+		svcManager.AddService("contender", &Contender{
+			ExtraArgs: ctx.Contender.ExtraArgs,
+		})
 	}
 
 	return svcManager