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mobula-api
Today at 14:32
Add rate limiting to the public API: 100 requests per minute per key, with tests.
Thinking
Read 4 files
Ran command: rg "middleware" Sources
Created RateLimiter.swift
Edited Router.swift
Ran command: swift test
Execution time: 1 min 12 s · 9 actions
Added a token-bucket limiter in front of the public routes.
RateLimiterkeeps one bucket per API key: 100 requests per minute.- Requests over the limit get
429with aRetry-Afterheader. swift testpasses on prod-sgp, including 3 new tests.
3 files changed+128 −6
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Sources/API/RateLimiter.swift+94
Sources/API/Router.swift+12 −6
Tests/APITests/RateLimiterTests.swift+22
Store the buckets in Redis so the limit holds across instances.
Thinking
Read Package.swift, RateLimiter.swift
Edited Package.swift
Created RedisBucketStore.swift
Ran command: swift build
Execution time: 48 s · 7 actions
The buckets now live in Redis under ratelimit:<key>, updated with one Lua script per request.
Then update the README.
Read README.md
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Sources
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RateLimiter.swift
Router.swift
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RateLimiterTests.swift
swiftSources/API/RateLimiter.swift+94
1import Foundation
2
3actor RateLimiter {
4 private var buckets: [String: Bucket] = [:]
5 let limit = 100
6 let window: TimeInterval = 60
7
8 func allow(_ key: String, now: Date = .now) -> Bool {
9 var bucket = buckets[key, default: Bucket(limit)]
10 bucket.refill(at: now, rate: Double(limit) / window)
11 guard bucket.tokens >= 1 else { return false }
12 bucket.tokens -= 1
13 buckets[key] = bucket
14 return true
15 }
16}
swiftSources/API/Router.swift+12 −6
@@ -41,6 +41,12 @@ struct Router
41 func route(_ req: Request) async throws -> Response {
42 return try await handler(for: req)(req)
42 guard await limiter.allow(req.apiKey) else {
43 return .tooManyRequests(retryAfter: 12)
44 }
45 return try await handler(for: req)(req)
46 }
47
48 func register(_ routes: [Route]) {
49 // TODO: rate limiting
50 table.append(contentsOf: routes)
prod-sgp · mobula-api
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localhost:8080/docslocalhost:8080/health
Mobula APIGuidesReferenceStatus
API reference
Authenticate with an API key in the Authorization header.
Rate limits
Each API key can send 100 requests per minute. Requests over the limit return 429 Too Many Requests.
Limit100 / min per keyHeader
Retry-AfterStorageRedisTokens
GET /v1/tokens returns the list of tokens, 50 per page.
Rate limiterLead: Main · 4 agents
ExchangesMain
Lead · Rate limiterRunningBackend
Redis bucket storeRunningTests
Load testsReady
Added 3 load tests. 500 requests from 5 keys: every request past 100 per key got 429.
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README and API docsWaiting−100 %+
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