Integration tests for Rbuilder #335

ferranbt · 2026-01-26T05:09:42Z

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claude · 2026-01-26T05:09:55Z

Claude finished @ferranbt's task in 1m 11s —— View job

Code Review Summary

I've reviewed this PR which adds integration tests for the Rbuilder component. Here are the key findings:

Issues Found

1. Error Handling (playground/components.go:761)

The error from WriteFile is silently ignored, acknowledged only by a TODO comment.

2. Inconsistent Service Naming (playground/components.go:763)

Service is named "component" instead of a meaningful name like "rbuilder".

3. Missing Artifacts/Volumes (playground/components.go:763-770)

The rbuilder config references /data/genesis.json and /data/volume-el-data but these aren't mounted, which will cause runtime failures.

4. Test Quality (playground/components_test.go:127)

Unconditional time.Sleep(10 * time.Second) adds delay without verifying any condition.

5. Documentation (playground/utils/rbuilder-config.toml.tmpl:4)

Hardcoded secrets without comments clarifying they are intentional test values.

Positive Changes

The AddService signature change to accept ExContext is a good fix.
The config file uses go:embed which is the correct pattern for this codebase.

Recommendation

The Rbuilder component needs the missing artifact/volume mounts to work at runtime. Consider adding proper health checks as well.

Task List

Gather context and understand the changes
Review code quality and best practices
Check for bugs, edge cases, and logical errors
Identify security concerns
Evaluate performance characteristics
Post review feedback

claude · 2026-01-26T05:10:58Z

playground/components.go

+	component := NewComponent("rbuilder")
+
+	// TODO: Handle error
+	ctx.Output.WriteFile("rbuilder-config.toml", rbuilderConfigToml)


The error from WriteFile is silently ignored. The TODO comment acknowledges this but the error should be handled. Consider returning the error or at minimum logging it.

Suggested change

ctx.Output.WriteFile("rbuilder-config.toml", rbuilderConfigToml)

if err := ctx.Output.WriteFile("rbuilder-config.toml", rbuilderConfigToml); err != nil {

// Since Apply doesn't return error, we must log or panic

panic(fmt.Sprintf("failed to write rbuilder config: %v", err))

}

Note: A better long-term fix would be to change the ComponentGen.Apply interface to return (*Component, error) to allow proper error propagation.

claude · 2026-01-26T05:10:59Z

playground/components.go

+	// TODO: Handle error
+	ctx.Output.WriteFile("rbuilder-config.toml", rbuilderConfigToml)
+
+	component.NewService("component").


The service is named "component" which is generic and doesn't match the component name "rbuilder". Other components use meaningful service names (e.g., op-rbuilder, mev-boost, op-geth).

Suggested change

component.NewService("component").

component.NewService("rbuilder").

claude · 2026-01-26T05:11:00Z

playground/components_test.go

+	}
+	tt.test(recipe, nil)
+
+	time.Sleep(10 * time.Second)


This time.Sleep(10 * time.Second) adds unnecessary delay to the test suite without verifying any condition. If the test needs to validate something after startup, use a proper wait condition (like waitForBlock used in other tests). If the sleep is meant to give rbuilder time to start, consider adding a health check to the Rbuilder component instead.

claude · 2026-01-26T05:11:02Z

playground/utils/rbuilder-config.toml.tmpl

+
+chain = "/data/genesis.json"
+reth_datadir = "/data/volume-el-data"
+relay_secret_key = "5eae315483f028b5cdd5d1090ff0c7618b18737ea9bf3c35047189db22835c48"


Hardcoded secrets (relay_secret_key and coinbase_secret_key) in the config template. While acceptable for development/testing, consider adding a comment to clarify these are intentionally insecure test values, similar to comments in other files (e.g., OpRbuilder at line 87 uses 0xac09... with no comment either).

claude · 2026-01-26T05:11:03Z

playground/components.go

+	component.NewService("component").
+		WithImage("ghcr.io/flashbots/rbuilder").
+		WithTag("1.3.5").
+		WithArtifact("/data/rbuilder-config.toml", "rbuilder-config.toml").
+		WithArgs(
+			"run", "/data/rbuilder-config.toml",
+		)
+


The Rbuilder component is missing:

Health check - Most other components define a WithReady() health check. Without it, dependent services cannot use DependsOnHealthy().

Required artifacts - The config references /data/genesis.json and /data/volume-el-data but these aren't mounted via WithArtifact() or WithVolume(). The component will likely fail at runtime.

Consider:

component.NewService("rbuilder"). WithImage("ghcr.io/flashbots/rbuilder"). WithTag("1.3.5"). WithArtifact("/data/rbuilder-config.toml", "rbuilder-config.toml"). WithArtifact("/data/genesis.json", "genesis.json"). WithVolume("el-data", "/data/volume-el-data"). WithArgs( "run", "/data/rbuilder-config.toml", )

claude · 2026-01-26T09:22:59Z

Claude finished @ferranbt's task in 2m 14s —— View job

Code Review Summary

Gather context and understand the changes
Review code quality and best practices
Check for bugs, edge cases, and logical errors
Identify security concerns
Evaluate performance characteristics
Post review feedback

This update addresses several issues from the previous review (service naming fixed, genesis.json and volume mounts added, config paths corrected). The new WithPlatform feature is a good addition to support cross-platform images.

Remaining issues:

File	Line	Issue
`components.go`	761	Error from `WriteFile` is silently ignored
`components.go`	773	Missing health check for Rbuilder component
`components_test.go`	127	Unconditional `time.Sleep` without verification
`local_runner.go`	503	Image validation skipped when platform is set
`local_runner.go`	559	Platform precedence may cause unexpected behavior

The most critical issue is the missing health check - without it, the test framework's WaitForReady won't wait for rbuilder, and the 10-second sleep is just a workaround that doesn't actually verify the service is healthy.

claude · 2026-01-26T09:25:13Z

playground/components.go

+	component := NewComponent("rbuilder")
+
+	// TODO: Handle error
+	ctx.Output.WriteFile("rbuilder-config.toml", rbuilderConfigToml)


The error from WriteFile is still ignored. The TODO comment acknowledges this but the error should be handled properly. Consider returning the error or at minimum logging it, as silent failures can lead to hard-to-debug runtime issues.

Suggested change

ctx.Output.WriteFile("rbuilder-config.toml", rbuilderConfigToml)

if err := ctx.Output.WriteFile("rbuilder-config.toml", rbuilderConfigToml); err != nil {

panic(fmt.Sprintf("failed to write rbuilder config: %v", err))

}

Note: A better long-term fix would be to change the ComponentGen.Apply interface to return (*Component, error).

claude · 2026-01-26T09:25:14Z

playground/components_test.go

+	}
+	tt.test(recipe, nil)
+
+	time.Sleep(10 * time.Second)


This time.Sleep(10 * time.Second) adds unnecessary delay without verifying any condition. The test framework already calls WaitForReady which waits for health checks. Without a health check on the Rbuilder component (see below), this sleep doesn't actually validate anything useful.

Either:

Add a health check to the Rbuilder component and remove this sleep, or

Add actual assertions after the sleep to validate rbuilder behavior (e.g., verify it's responding to requests)

claude · 2026-01-26T09:25:15Z

playground/components.go

+		WithArgs(
+			"run", "/data/rbuilder-config.toml",
+		)
+


The Rbuilder component is missing a health check. Most other components define a WithReady() health check, which allows the test framework's WaitForReady to properly wait for this service. Without it, dependent services cannot use DependsOnHealthy() and the integration test can't reliably verify the service started correctly.

Consider adding a health check similar to other components, for example:

WithReady(ReadyCheck{ Test: HealthcheckTest{"/bin/sh", "-c", "curl -sf http://localhost:PORT/health || exit 1"}, })

claude · 2026-01-26T09:25:16Z

playground/local_runner.go

-	if err := d.validateImageExists(imageName); err != nil {
-		return nil, nil, fmt.Errorf("failed to validate image %s: %w", imageName, err)
+	// TODO: Cannot validate if they have a platform
+	if s.Platform == "" {


Skipping image validation when a platform is specified creates a potential failure mode. If the image doesn't exist, the error will only surface later during docker compose up.

Consider enhancing validateImageExists to accept a platform parameter instead of skipping validation entirely, or document why platform-specific images can't be validated.

claude · 2026-01-26T09:25:17Z

playground/local_runner.go

 		"labels":   labels,
 	}

+	if s.Platform != "" {


The service-level platform (line 560) can be overwritten by the config-level platform (line 564). This may be intentional, but it means WithPlatform() has no effect if d.config.Platform is set. Consider:

Documenting this precedence behavior, or

Only applying config platform if service platform is empty:

if s.Platform != "" { service["platform"] = s.Platform } else if d.config.Platform != "" { service["platform"] = d.config.Platform }

ferranbt added 2 commits January 26, 2026 08:52

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Integration tests for Rbuilder #335

Integration tests for Rbuilder #335

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-	ctx.Output.WriteFile("rbuilder-config.toml", rbuilderConfigToml)
+	if err := ctx.Output.WriteFile("rbuilder-config.toml", rbuilderConfigToml); err != nil {
+		// Since Apply doesn't return error, we must log or panic
+		panic(fmt.Sprintf("failed to write rbuilder config: %v", err))
+	}

	component.NewService("component").
	component.NewService("rbuilder").

Integration tests for Rbuilder #335

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Code Review Summary

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