chore(rivetkit): auto-generate inspector token for engine driver #3409
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PR Review: Auto-generate inspector token for engine driverSummaryThis PR adds automatic inspector token generation and persistence for actors in the Engine driver. The token is generated once per actor, stored in KV storage, and retrieved via the new ✅ Strengths
🔍 Issues & Concerns1. Security: Cloudflare Workers uses insecure token generation// cloudflare-workers/src/actor-driver.ts:159
getInspectorToken(_actorId: string): string | undefined {
// TODO: Inspector currently disabled. Need to implement a way to store the token in CF KV similar to the Engine driver.
return generateRandomString(); // ⚠️ Uses Math.random(), not cryptographically secure\!
}Impact: If the Cloudflare Workers inspector is ever enabled, it would use predictable tokens vulnerable to brute force attacks. Recommendation: Either:
2. Error handling: Synchronous invariants in async context// drivers/engine/actor-driver.ts:941
getInspectorToken(actorId: string): string | undefined {
const handler = this.#actors.get(actorId);
invariant(handler, "handler does not exist in getInspectorToken");
invariant(
handler.inspectorToken,
"handler.inspectorToken does not exist in getInspectorToken",
);
return handler.inspectorToken;
}Concern: This method uses invariants that will throw if:
Questions:
Recommendation: Consider either:
3. Missing test coverageThe inspector tests in Recommendation:
4. Minor: Potential KV storage efficiency// drivers/engine/actor-driver.ts:443
const [persistedValue, inspectorTokenValue] =
await this.#runner.kvGet(actorId, [
KEYS.PERSIST_DATA,
KEYS.INSPECTOR.TOKEN,
]);The code loads the token on every actor initialization. This is good for correctness, but:
Not critical, but worth considering for optimization if actor initialization is a hot path. 5. Documentation gaps
🎯 RecommendationsBefore merge:
Follow-up work:
📊 Code Quality Assessment
Overall AssessmentThis is a solid implementation for the Engine driver, but has some gaps in error handling, security (CF Workers), and testing. The core functionality looks correct, but needs hardening before production use. |
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Code ReviewSummaryThis PR adds auto-generation of inspector tokens for the Engine driver, introducing a new Findings🔴 Critical Issues1. Security Issue in CloudFlare Driver (
// Current (INSECURE):
return generateRandomString();
// Better temporary solution:
return undefined; // Disable auth until properly implemented
// Or implement proper storage like Engine driver🟡 Medium Priority Issues2. Interface Contract Violation (
getInspectorToken(actorId: string): string | undefined {
const handler = this.#actors.get(actorId);
if (\!handler?.inspectorToken) {
logger().warn({ actorId, msg: "inspector token requested for uninitialized actor" });
return undefined;
}
return handler.inspectorToken;
}3. Race Condition Risk (
handler = {
actorStartPromise: promiseWithResolvers(),
persistedData: undefined,
inspectorToken: undefined, // Explicitly initialize
};4. Missing Usage of New Method
🟢 Minor Issues5. Typo in TODO Comment (
6. Inconsistent Token Storage Pattern (
if (inspectorTokenValue \!== null) {
try {
const decoder = new TextDecoder();
handler.inspectorToken = decoder.decode(inspectorTokenValue);
} catch (err) {
logger().warn({ actorId, err, msg: "failed to decode inspector token, regenerating" });
handler.inspectorToken = generateSecureToken();
// Save new token...
}
}7. Import Organization (
Test Coverage❌ No tests found for the new
Performance Considerations✅ Good: Token is generated once and cached in memory, only written to storage on first creation Positive Observations✅ Proper use of Recommendations
Overall, solid implementation with a few critical issues that should be addressed before merging. |
PR Review: Auto-generate Inspector Token for Engine DriverSummaryThis PR implements automatic inspector token generation for the engine driver, storing tokens persistently in KV storage. This is a security and convenience improvement that ensures each actor has a unique, persistent token for inspector authentication. Code Quality & Best Practices✅ Strengths
🔍 Areas for Improvement1. Cloudflare Driver Security Issue
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Code Review: Auto-generate inspector token for engine driverI've reviewed PR #3409. Overall, the implementation is solid and follows good patterns. Here are my findings: ✅ Strengths
🔍 Code Quality & Best PracticesPositive:
Minor suggestion:
if (tokenBuffer !== null) {
try {
const decoder = new TextDecoder();
this.#inspectorToken = decoder.decode(tokenBuffer);
this.#rLog.debug({ msg: "loaded existing inspector token" });
} catch (error) {
this.#rLog.warn({ msg: "failed to decode inspector token, regenerating", error });
// Fall through to generate new token
}
}
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PR Review: Auto-generate inspector token for engine driverSummaryThis PR adds automatic generation and persistence of inspector tokens for actor instances. The token is generated on first actor initialization and persisted to KV storage for subsequent uses. Code Quality & Best Practices ✅Strengths:
Minor Issues:
Potential Bugs & Issues
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Pull Request ReviewOverviewThis PR implements auto-generation of inspector tokens for the engine driver at the actor instance level. The token is generated once per actor and persisted in KV storage, which is a good approach for maintaining consistency across actor lifecycles. ✅ Strengths
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Code Review: Auto-generate Inspector Token for Engine DriverOverviewThis PR adds automatic generation and persistence of inspector tokens for actor instances. The token is stored in KV storage and reused across actor lifecycle events. ✅ Positive Aspects
🔍 Issues & Concerns1. Missing Error Handling (Priority: Medium)Location: The Recommendation: Add try-catch with appropriate logging: async #initializeInspectorToken() {
try {
const [tokenBuffer] = await this.#actorDriver.kvBatchGet(
this.#actorId,
[KEYS.INSPECTOR_TOKEN],
);
// ... rest of implementation
} catch (error) {
this.#rLog.error({ msg: "failed to initialize inspector token", error });
throw error;
}
}2. Token Security - No Rotation Mechanism (Priority: Medium)Location: Once generated, the token is never rotated. If compromised, there's no mechanism to invalidate it without deleting the entire actor state. Recommendation: Consider adding:
3. Missing Test Coverage (Priority: High)Issue: No tests verify the new inspector token functionality Recommendation: Add tests for:
Example test structure: describe('Inspector Token', () => {
it('generates token on first start', async () => { /* ... */ });
it('reuses token after restart', async () => { /* ... */ });
it('generates unique tokens per actor', async () => { /* ... */ });
});4. Inconsistent Import Style (Priority: Low)Location: Changed from Before: import type {
ActorDriver,
AnyActorInstance,
ManagerDriver,
} from "rivetkit/driver-helpers";After: import {
type ActorDriver,
type AnyActorInstance,
type ManagerDriver,
} from "rivetkit/driver-helpers";Recommendation: Revert to consistent 5. TODO Comment Lacks Context (Priority: Low)Location: // TODO(kacper): Remove context in favor of using the gateway, so only context is the actorWhile this indicates planned refactoring, it doesn't explain how this PR fits into that future work. Recommendation: Add a comment explaining the relationship: // TODO(kacper): Remove context in favor of using the gateway, so only context is the actor
// Note: This PR adds per-actor token generation as an interim step toward that architecture6. Missing Documentation (Priority: Medium)Location: The public getter has no JSDoc explaining its purpose, when it might be Recommendation: Add documentation: /**
* Returns the inspector access token for this actor instance.
* The token is automatically generated on first start and persisted across restarts.
*
* @returns The inspector token, or undefined if inspector is disabled or not yet initialized
* @experimental This API may change as we move to gateway-based inspector authentication
*/
get inspectorToken(): string | undefined {
return this.#inspectorToken;
}🎯 Functional Concerns7. Race Condition Potential (Priority: Low)Location: If Verification Needed: Confirm that the KV driver properly handles concurrent operations to different keys from the same actor. 8. Token Not Used Yet? (Priority: High - Clarification Needed)Observation: The PR generates and stores the token, but I don't see where it's actually used for authentication in the inspector. Questions:
The TODO comments suggest this is transitional, but the relationship to the final architecture isn't clear. 📋 Architecture Questions
✅ Testing RecommendationsSince there are no existing tests for this feature, please add:
📝 Suggestions for Follow-up PRs
SummaryOverall Assessment: The implementation is solid and follows good patterns, but needs:
The code quality is good and consistent with the codebase style. The main concerns are the missing tests and unclear integration story with the rest of the inspector system. |
Code ReviewI've reviewed PR #3409 and have the following feedback: OverviewThis PR adds automatic inspector token generation for the engine driver. The implementation generates a secure token per actor instance and persists it in KV storage. ✅ Strengths
🔍 Issues & Recommendations1. Import Organization (Minor - Style)In import {
type ActorDriver,
type AnyActorInstance,
type ManagerDriver,
} from "rivetkit/driver-helpers";This change appears unrelated to the PR's purpose. According to CLAUDE.md, you should "Always add imports at the top of the file inside of inline within the function." However, this seems to refer to avoiding inline imports within functions, not the type import syntax change. This change is fine but consider keeping it in a separate formatting/cleanup commit. 2. Missing Test Coverage (Medium - Testing)There are no tests for the new inspector token functionality. Consider adding tests that verify:
3. Error Handling (Low - Robustness)The
async #initializeInspectorToken() {
try {
const [tokenBuffer] = await this.#actorDriver.kvBatchGet(
this.#actorId,
[KEYS.INSPECTOR_TOKEN],
);
// ... rest of implementation
} catch (error) {
this.#rLog.error({ msg: "failed to initialize inspector token", error });
throw error; // or implement fallback
}
}4. Token Security Considerations (Low - Security)
5. Type Safety (Low - Type Safety)The
get inspectorToken(): string | undefined {
return this.#inspectorToken;
}6. Documentation (Low - Documentation)The new TODO comments added are helpful but consider:
🧪 CI/CD StatusThe PR has a failing quality check in the JavaScript workflow. Please review and fix the failure before merging. 📝 Minor Issues
SummaryThe implementation is solid and follows good security practices for token generation. The main areas for improvement are:
Overall, this is a well-structured change that implements the intended functionality correctly. With the addition of tests and resolution of the CI failure, this would be ready to merge. Recommendation: Request changes to add tests and fix CI before merging. |
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