feat(server): ratelimit helpers & plugins by dinwwwh · Pull Request #1183 · middleapi/orpc

dinwwwh · 2025-11-06T14:12:35Z

Closes: #910

Summary by CodeRabbit

New Features
- Introduced rate-limiting with Memory, Redis, and Upstash adapters; middleware supports per-request dedupe and optional blocking mode; automatic HTTP headers (RateLimit-Limit/Remaining/Reset) and Retry-After.
Documentation
- Added comprehensive "Ratelimit" docs, examples, navigation entry, and package README.
Tests
- Added unit, integration, and end-to-end tests covering adapters, middleware, handler integration, and headers.
Chores
- New experimental ratelimit package manifest, devDependency added, and package ignore updates.

…tash adapter & tests - Add IORedisRatelimiter implementation and full test suite for ioredis adapter. - Normalize RatelimiterLimitResult: rename `reset` -> `resetAtMs` and remove `pending`. - Update Upstash adapter to map Upstash response to the unified result shape and keep invoking waitUtil. - Adjust Upstash tests to expect waitUtil called with a Promise.

vercel · 2025-11-06T14:12:40Z

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Preview	Comments	Updated (UTC)
orpc	Ready	Preview	Comment	Nov 7, 2025 8:06am

coderabbitai · 2025-11-06T14:12:45Z

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Walkthrough

Adds an experimental rate-limiting package (@orpc/experimental-ratelimit) with Memory/Redis/Upstash adapters, middleware and handler-plugin, tests (unit/integration/e2e), docs/site entries, package manifests, and TypeScript project configuration.

Changes

Cohort / File(s)	Summary
Docs & Site `apps/content/.vitepress/config.ts`, `apps/content/docs/helpers/ratelimit.md`, `apps/content/package.json`	Adds site navigation and a detailed ratelimit docs page; lists `@orpc/experimental-ratelimit` as a devDependency for the docs app.
Package Manifest & Config `packages/ratelimit/package.json`, `packages/ratelimit/tsconfig.json`, `packages/ratelimit/.gitignore`, `packages/ratelimit/README.md`	New package manifest and publish exports for `@orpc/experimental-ratelimit`, TS project refs, .gitignore, README, build/type scripts, and publish files config.
Public Surface `packages/ratelimit/src/index.ts`, `packages/ratelimit/src/types.ts`, `packages/ratelimit/src/index.test.ts`	Adds aggregated re-exports and new public interfaces `Ratelimiter` and `RatelimiterLimitResult`; test verifies index exports.
Memory Adapter `packages/ratelimit/src/adapters/memory.ts`, `packages/ratelimit/src/adapters/memory.test.ts`	In-memory sliding-window limiter with optional blockingUntilReady, cleanup logic and comprehensive unit tests (concurrency, expiration, blocking, cleanup).
Redis Adapter `packages/ratelimit/src/adapters/redis.ts`, `packages/ratelimit/src/adapters/redis.test.ts`	Redis adapter using an atomic Lua sliding-window script, optional blocking mode and prefixing; tests expect a live Redis instance.
Upstash Adapter `packages/ratelimit/src/adapters/upstash-ratelimit.ts`, `packages/ratelimit/src/adapters/upstash-ratelimit.test.ts`	Upstash wrapper adapter supporting blockingUntilReady and optional waitUntil hook; tests require Upstash env vars.
Middleware `packages/ratelimit/src/middleware.ts`, `packages/ratelimit/src/middleware.test.ts`, `packages/ratelimit/src/middleware.test-d.ts`	`createRatelimitMiddleware` with limiter/key resolver factories, per-request dedupe, context symbol propagation, throws TOO_MANY_REQUESTS on exceed; extensive behavioral and type tests.
Handler Plugin `packages/ratelimit/src/handler-plugin.ts`, `packages/ratelimit/src/handler-plugin.test.ts`	`RatelimitHandlerPlugin` with `RATELIMIT_HANDLER_CONTEXT_SYMBOL`; injects RateLimit-* headers and Retry-After when appropriate; tests cover header/context behaviors.
Integration & E2E `packages/ratelimit/tests/e2e.test.ts`	End-to-end test wiring middleware + handler-plugin with MemoryRatelimiter to validate header propagation and 429 behavior when limits exhaust.

Sequence Diagram(s)

sequenceDiagram
    participant C as Client
    participant M as Ratelimit Middleware
    participant L as Ratelimiter (Memory/Redis/Upstash)
    participant H as Handler (business logic)
    participant P as Ratelimit Plugin
    participant R as HTTP Response

    C->>M: Request
    M->>M: Resolve limiter & key
    alt dedupe enabled
        M-->>M: Check per-request dedupe
    end
    M->>L: limit(key)
    alt allowed
        L-->>M: {success:true, limit, remaining, reset}
        M->>H: Continue with RATELIMIT_MIDDLEWARE_CONTEXT_SYMBOL
        H->>P: Response finalization
        P->>R: Inject RateLimit-* headers
        R-->>C: 200 + RateLimit headers
    else denied
        L-->>M: {success:false, remaining, reset}
        M->>M: Throw TOO_MANY_REQUESTS (with metadata)
        P->>R: Add Retry-After when 429 & reset present
        R-->>C: 429 + RateLimit + Retry-After
    end

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Areas to focus:
- Middleware deduplication, per-request context symbol handling (packages/ratelimit/src/middleware.ts and tests).
- Redis Lua script response validation and error handling (packages/ratelimit/src/adapters/redis.ts and tests).
- Blocking/looping semantics and timing behavior in Memory adapter (packages/ratelimit/src/adapters/memory.ts and tests).
- Header computation and Retry-After logic in handler-plugin (packages/ratelimit/src/handler-plugin.ts).

Possibly related PRs

unnoq/orpc#292 — Related changes to handler/plugin interfaces that the new RatelimitHandlerPlugin integrates with.

Poem

🐰
I hopped through code with nimble feet,
Counters tick and windows meet,
Memory, Redis, Upstash aligned,
Middleware sings as headers bind,
Hop — limits dance, requests kept neat.

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%.	You can run `@coderabbitai generate docstrings` to improve docstring coverage.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title accurately describes the main change: adding rate limiting helpers and plugins to the server package.
Linked Issues check	✅ Passed	The PR implements all objectives from #910: provides rate limiting as both plugin and middleware, supports multiple backends (Redis, Memory, Upstash), and enables extensibility.
Out of Scope Changes check	✅ Passed	All changes directly support the rate limiting feature implementation. Documentation, tests, configuration, and adapters are all integral to delivering the requested functionality.

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gemini-code-assist · 2025-11-06T14:13:02Z

Summary of Changes

Hello @unnoq, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a robust and flexible rate limiting solution for oRPC, designed to enhance API stability and prevent abuse. It provides a new experimental package, @orpc/experimental-ratelimit, which offers various storage backends like in-memory, Redis, and Upstash. The integration is streamlined through a dedicated middleware (createRatelimitMiddleware) for oRPC procedures and a handler plugin (RatelimitHandlerPlugin) that automatically manages HTTP rate limit headers, including Retry-After for 429 responses. This feature allows developers to easily implement sophisticated rate limiting strategies tailored to their application's needs.

Highlights

New Rate Limiting Package: Introduced @orpc/experimental-ratelimit to provide flexible rate limiting capabilities for oRPC applications.
Multiple Adapter Support: Includes built-in adapters for in-memory, Redis, and Upstash, allowing developers to choose the most suitable storage backend.
createRatelimitMiddleware: A new middleware helper for easily integrating rate limiting into oRPC procedures, supporting dynamic limiters and keys.
RatelimitHandlerPlugin: A handler plugin that automatically adds standard RateLimit-* and Retry-After HTTP headers to responses.
Blocking Mode: Adapters now support a blocking mode, allowing requests to wait for the rate limit to reset instead of immediate rejection.
Comprehensive Documentation: Added detailed documentation covering installation, adapter usage, blocking mode, manual limiting, middleware integration, and the handler plugin.

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pkg-pr-new · 2025-11-06T14:15:27Z

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commit: 131295c

Copilot

Pull Request Overview

This PR introduces a new rate limiting package (@orpc/experimental-ratelimit) to the oRPC monorepo, providing flexible rate limiting capabilities with multiple storage backend adapters (memory, Redis, Upstash). The implementation includes middleware for applying rate limits, a handler plugin for adding standard rate limit headers to responses, and comprehensive test coverage.

Key changes:

New @orpc/experimental-ratelimit package with Memory, Redis, and Upstash adapters
Rate limit middleware with automatic deduplication support
Handler plugin for automatic rate limit header injection
Comprehensive documentation and test coverage

Reviewed Changes

Copilot reviewed 22 out of 23 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
pnpm-lock.yaml	Added dependencies for ratelimit package including @upstash/ratelimit and ioredis
packages/ratelimit/*	Complete implementation of ratelimit package with adapters, middleware, plugin, types, and tests
apps/content/package.json	Added ratelimit package to content app dependencies
apps/content/docs/helpers/ratelimit.md	Comprehensive documentation for the ratelimit package
apps/content/.vitepress/config.ts	Added ratelimit to documentation navigation

Files not reviewed (1)

pnpm-lock.yaml: Language not supported

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codecov · 2025-11-06T14:16:18Z

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

gemini-code-assist

Code Review

This pull request introduces a comprehensive rate limiting feature, including helpers and plugins. It adds a new experimental package @orpc/experimental-ratelimit with adapters for in-memory, Redis, and Upstash, along with middleware and a handler plugin for easy integration. The implementation is well-structured with good documentation and extensive tests. I've identified a critical bug in the memory adapter's timestamp cleanup logic and a high-severity issue with context propagation in the middleware. Additionally, there's a minor typo in a comment. After addressing these points, this will be a solid addition to the library.

coderabbitai

Actionable comments posted: 5

🧹 Nitpick comments (3)

packages/ratelimit/tests/e2e.test.ts (1)
8-67: Consider test isolation and additional coverage.

The e2e test provides good coverage of the happy path and rate-limiting scenario. Consider these optional enhancements:

The limiter instance persists across test reruns. For complete isolation, create a fresh limiter per test or reset state.

Test coverage could be expanded to validate multiple keys/users to ensure per-key isolation.

The reset time is only checked for type (string), but not validated for reasonable value range.

Example improvement for key isolation testing:
+ // Test different keys are tracked independently
+ const limiter2 = new MemoryRatelimiter({
+   maxRequests: 5,
+   window: 1000,
+ })
+ const request2 = new Request('https://example.com/login', {
+   method: 'POST',
+   body: JSON.stringify({ json: { email: 'other@example.com' } }),
+   headers: { 'Content-Type': 'application/json' },
+ })
+ const { response: response2 } = await handler.handle(request2, {
+   context: { limiter: limiter2 },
+ })
+ expect(response2?.status).toBe(200)
packages/ratelimit/src/adapters/redis.test.ts (1)
173-192: Long timeout for auto-expiration test may mask issues.

The 20-second timeout with 1-second polling interval for key expiration is quite generous. If Redis expiration is not working correctly, this test might still pass by waiting unnecessarily long.

Consider reducing the timeout or checking TTL explicitly:
  // Wait until the key is auto-expired
  await vi.waitFor(async () => {
    const keysAfterExpiry = await redis.keys(`${prefix}${key}`)
    expect(keysAfterExpiry).toHaveLength(0)
- }, { timeout: 20_000, interval: 1000 })
+ }, { timeout: 5_000, interval: 500 })
Alternatively, check the TTL directly to ensure expiration is configured:
const ttl = await redis.pttl(`${prefix}${key}`)
expect(ttl).toBeGreaterThan(0)
expect(ttl).toBeLessThanOrEqual(1000)
packages/ratelimit/src/handler-plugin.test.ts (1)
1-184: Excellent test coverage!

The test suite comprehensively covers all scenarios for the RatelimitHandlerPlugin, including header injection, conditional retry-after logic, edge cases, and context management.

Optional improvement: Consider replacing any types with proper interfaces for better type safety:
interface MockOptions {
  rootInterceptors: Array<(options: any) => Promise<any>>
}
This is a minor suggestion and doesn't affect functionality.

📜 Review details

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Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 2ab85b9 and cdd1bd2.

⛔ Files ignored due to path filters (1)

pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (22)

apps/content/.vitepress/config.ts (1 hunks)
apps/content/docs/helpers/ratelimit.md (1 hunks)
apps/content/package.json (1 hunks)
packages/ratelimit/.gitignore (1 hunks)
packages/ratelimit/README.md (1 hunks)
packages/ratelimit/package.json (1 hunks)
packages/ratelimit/src/adapters/memory.test.ts (1 hunks)
packages/ratelimit/src/adapters/memory.ts (1 hunks)
packages/ratelimit/src/adapters/redis.test.ts (1 hunks)
packages/ratelimit/src/adapters/redis.ts (1 hunks)
packages/ratelimit/src/adapters/upstash-ratelimit.test.ts (1 hunks)
packages/ratelimit/src/adapters/upstash-ratelimit.ts (1 hunks)
packages/ratelimit/src/handler-plugin.test.ts (1 hunks)
packages/ratelimit/src/handler-plugin.ts (1 hunks)
packages/ratelimit/src/index.test.ts (1 hunks)
packages/ratelimit/src/index.ts (1 hunks)
packages/ratelimit/src/middleware.test-d.ts (1 hunks)
packages/ratelimit/src/middleware.test.ts (1 hunks)
packages/ratelimit/src/middleware.ts (1 hunks)
packages/ratelimit/src/types.ts (1 hunks)
packages/ratelimit/tests/e2e.test.ts (1 hunks)
packages/ratelimit/tsconfig.json (1 hunks)

🧰 Additional context used

🧬 Code graph analysis (12)

packages/ratelimit/src/middleware.test-d.ts (4)

packages/server/src/builder.ts (1)

os (336-352)

packages/ratelimit/src/types.ts (1)

Ratelimiter (20-22)

packages/contract/src/schema.ts (1)

type (25-39)

packages/ratelimit/src/middleware.ts (1)

createRatelimitMiddleware (45-92)

packages/ratelimit/src/adapters/memory.test.ts (2)

packages/ratelimit/src/adapters/memory.ts (1)

MemoryRatelimiter (24-119)

packages/shared/src/index.ts (1)

sleep (22-22)

packages/ratelimit/tests/e2e.test.ts (5)

packages/server/src/builder.ts (2)

os (336-352)

handler (273-280)

packages/ratelimit/src/types.ts (1)

Ratelimiter (20-22)

packages/ratelimit/src/middleware.ts (1)

createRatelimitMiddleware (45-92)

packages/ratelimit/src/handler-plugin.ts (1)

RatelimitHandlerPlugin (16-58)

packages/ratelimit/src/adapters/memory.ts (1)

MemoryRatelimiter (24-119)

packages/ratelimit/src/middleware.ts (6)

packages/ratelimit/src/types.ts (1)

Ratelimiter (20-22)

packages/server/src/context.ts (1)

Context (1-1)

packages/shared/src/value.ts (1)

Value (1-1)

packages/server/src/middleware.ts (2)

MiddlewareOptions (26-39)

Middleware (46-61)

packages/ratelimit/src/handler-plugin.ts (2)

RatelimitHandlerPluginContext (7-14)

RATELIMIT_HANDLER_CONTEXT_SYMBOL (5-5)

packages/shared/src/array.ts (1)

toArray (1-3)

packages/ratelimit/src/handler-plugin.test.ts (3)

packages/ratelimit/src/handler-plugin.ts (2)

RatelimitHandlerPlugin (16-58)

RATELIMIT_HANDLER_CONTEXT_SYMBOL (5-5)

packages/server/src/adapters/standard/handler.ts (1)

StandardHandler (50-183)

packages/server/src/adapters/standard/rpc-matcher.ts (1)

StandardRPCMatcher (24-118)

packages/ratelimit/src/handler-plugin.ts (4)

packages/server/src/context.ts (1)

Context (1-1)

packages/ratelimit/src/types.ts (1)

RatelimiterLimitResult (1-18)

packages/server/src/adapters/standard/plugin.ts (1)

StandardHandlerPlugin (5-8)

packages/server/src/adapters/standard/handler.ts (1)

StandardHandlerOptions (27-48)

packages/ratelimit/src/adapters/upstash-ratelimit.test.ts (1)

packages/ratelimit/src/adapters/upstash-ratelimit.ts (1)

UpstashRatelimiter (28-48)

packages/ratelimit/src/middleware.test.ts (5)

packages/ratelimit/src/types.ts (2)

RatelimiterLimitResult (1-18)

Ratelimiter (20-22)

packages/ratelimit/src/middleware.ts (3)

createRatelimitMiddleware (45-92)

RATELIMIT_MIDDLEWARE_CONTEXT_SYMBOL (9-9)

RatelimiterMiddlewareContext (11-18)

packages/server/src/builder.ts (1)

os (336-352)

packages/ratelimit/src/handler-plugin.ts (1)

RATELIMIT_HANDLER_CONTEXT_SYMBOL (5-5)

packages/contract/src/schema.ts (1)

type (25-39)

packages/ratelimit/src/adapters/redis.test.ts (1)

packages/ratelimit/src/adapters/redis.ts (2)

RedisRatelimiterOptions (50-77)

RedisRatelimiter (79-143)

packages/ratelimit/src/adapters/upstash-ratelimit.ts (1)

packages/ratelimit/src/types.ts (2)

Ratelimiter (20-22)

RatelimiterLimitResult (1-18)

packages/ratelimit/src/adapters/memory.ts (1)

packages/ratelimit/src/types.ts (2)

Ratelimiter (20-22)

RatelimiterLimitResult (1-18)

packages/ratelimit/src/adapters/redis.ts (3)

packages/ratelimit/src/types.ts (2)

Ratelimiter (20-22)

RatelimiterLimitResult (1-18)

packages/shared/src/value.ts (1)

fallback (17-19)

packages/ratelimit/src/adapters/memory.ts (1)

limit (38-46)

🪛 LanguageTool

apps/content/docs/helpers/ratelimit.md

[grammar] ~123-~123: Use a hyphen to join words.
Context: ...ectly without middleware for custom rate limiting logic: ```ts twoslash import {...

(QB_NEW_EN_HYPHEN)

packages/ratelimit/README.md

[style] ~54-~54: Three successive sentences begin with the same word. Consider rewording the sentence or use a thesaurus to find a synonym.
Context: ... your API or implement API contract. - [@orpc/client](https://www.npmjs.com/package/@...