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import { Effect, Fiber, Layer, Random, Ref } from "effect"
import * as TestClock from "effect/testing/TestClock"
import { Headers, HttpClient, HttpClientRequest, HttpClientResponse } from "effect/unstable/http"
import { LLM, LLMError } from "../src"
import { LLMClient, RequestExecutor } from "../src/route"
import * as OpenAIChat from "../src/protocols/openai-chat"
import { dynamicResponse } from "./lib/http"
import { deltaChunk } from "./lib/openai-chunks"
import { sseRaw } from "./lib/sse"
import { it } from "./lib/effect"
const request = HttpClientRequest.post("https://provider.test/v1/chat?api_key=secret&key=secret&debug=1").pipe(
HttpClientRequest.setHeaders(Headers.fromInput({ authorization: "Bearer secret", "x-safe": "visible" })),
)
const secretRequest = HttpClientRequest.post("https://provider.test/v1/chat?api_key=query-secret-123&debug=1").pipe(
HttpClientRequest.setHeaders(Headers.fromInput({ authorization: "Bearer header-secret-456" })),
)
const responsesLayer = (responses: ReadonlyArray<Response>) =>
RequestExecutor.layer.pipe(
Layer.provide(
Layer.unwrap(
Effect.gen(function* () {
const cursor = yield* Ref.make(0)
return Layer.succeed(
HttpClient.HttpClient,
HttpClient.make((request) =>
Effect.gen(function* () {
const index = yield* Ref.getAndUpdate(cursor, (value) => value + 1)
return HttpClientResponse.fromWeb(request, responses[index] ?? responses[responses.length - 1])
}),
),
)
}),
),
),
)
const countedResponsesLayer = (attempts: Ref.Ref<number>, responses: ReadonlyArray<Response>) =>
RequestExecutor.layer.pipe(
Layer.provide(
Layer.unwrap(
Effect.gen(function* () {
const cursor = yield* Ref.make(0)
return Layer.succeed(
HttpClient.HttpClient,
HttpClient.make((request) =>
Effect.gen(function* () {
yield* Ref.update(attempts, (value) => value + 1)
const index = yield* Ref.getAndUpdate(cursor, (value) => value + 1)
return HttpClientResponse.fromWeb(request, responses[index] ?? responses[responses.length - 1])
}),
),
)
}),
),
),
)
const randomMidpoint = {
nextDoubleUnsafe: () => 0.5,
nextIntUnsafe: () => 0,
}
const expectLLMError = (error: unknown) => {
expect(error).toBeInstanceOf(LLMError)
if (!(error instanceof LLMError)) throw new Error("expected LLMError")
return error
}
const errorHttp = (error: LLMError) => ("http" in error.reason ? error.reason.http : undefined)
describe("RequestExecutor", () => {
it.effect("classifies context overflow responses", () =>
Effect.gen(function* () {
const executor = yield* RequestExecutor.Service
const error = yield* executor.execute(request).pipe(Effect.flip)
expectLLMError(error)
expect(error.reason).toMatchObject({ _tag: "InvalidRequest", classification: "context-overflow" })
}).pipe(
Effect.provide(
responsesLayer([
new Response('{"error":{"code":"context_length_exceeded","message":"prompt too long"}}', {
status: 400,
}),
]),
),
),
)
it.effect("does not classify generic HTTP 413 payload errors as context overflow", () =>
Effect.gen(function* () {
const executor = yield* RequestExecutor.Service
const error = yield* executor.execute(request).pipe(Effect.flip)
expectLLMError(error)
expect(error.reason).toMatchObject({ _tag: "InvalidRequest" })
expect("classification" in error.reason ? error.reason.classification : undefined).toBeUndefined()
}).pipe(Effect.provide(responsesLayer([new Response("request too large", { status: 413 })]))),
)
it.effect("does not classify ordinary invalid requests as context overflow", () =>
Effect.gen(function* () {
const executor = yield* RequestExecutor.Service
const error = yield* executor.execute(request).pipe(Effect.flip)
expectLLMError(error)
expect(error.reason).toMatchObject({ _tag: "InvalidRequest" })
expect("classification" in error.reason ? error.reason.classification : undefined).toBeUndefined()
}).pipe(Effect.provide(responsesLayer([new Response("invalid parameter", { status: 400 })]))),
)
it.effect("returns redacted diagnostics for retryable rate limits", () =>
Effect.gen(function* () {
const executor = yield* RequestExecutor.Service
const error = yield* executor.execute(request).pipe(Effect.flip)
expectLLMError(error)
expect(error).toMatchObject({
retryable: true,
retryAfterMs: 0,
reason: {
_tag: "RateLimit",
rateLimit: { retryAfterMs: 0 },
http: {
requestId: "req_123",
request: {
method: "POST",
url: "https://provider.test/v1/chat?api_key=%3Credacted%3E&key=%3Credacted%3E&debug=1",
headers: { authorization: "<redacted>", "x-safe": "visible" },
},
response: {
status: 429,
headers: {
"retry-after-ms": "0",
"x-request-id": "req_123",
"x-api-key": "<redacted>",
},
},
},
},
})
expect(errorHttp(error)?.body).toBe("rate limited")
}).pipe(
Effect.provide(
responsesLayer(
Array.from(
{ length: 3 },
() =>
new Response("rate limited", {
status: 429,
headers: { "retry-after-ms": "0", "x-request-id": "req_123", "x-api-key": "secret" },
}),
),
),
),
),
)
it.effect("honors current redacted header names in diagnostics", () =>
Effect.gen(function* () {
const executor = yield* RequestExecutor.Service
const error = yield* executor.execute(request).pipe(Effect.flip)
expectLLMError(error)
expect(errorHttp(error)?.request.headers["x-safe"]).toBe("<redacted>")
expect(errorHttp(error)?.response?.headers["x-safe"]).toBe("<redacted>")
}).pipe(
Effect.provide(responsesLayer([new Response("bad", { status: 400, headers: { "x-safe": "response-secret" } })])),
Effect.provideService(Headers.CurrentRedactedNames, ["x-safe"]),
),
)
it.effect("extracts OpenAI-style rate-limit diagnostics", () =>
Effect.gen(function* () {
const executor = yield* RequestExecutor.Service
const error = yield* executor.execute(request).pipe(Effect.flip)
expectLLMError(error)
expect(error.reason).toMatchObject({ _tag: "RateLimit" })
expect(error.reason._tag === "RateLimit" ? error.reason.rateLimit : undefined).toEqual({
retryAfterMs: 0,
limit: { requests: "500", tokens: "30000" },
remaining: { requests: "499", tokens: "29900" },
reset: { requests: "1s", tokens: "10s" },
})
}).pipe(
Effect.provide(
responsesLayer(
Array.from(
{ length: 3 },
() =>
new Response("rate limited", {
status: 429,
headers: {
"retry-after-ms": "0",
"x-ratelimit-limit-requests": "500",
"x-ratelimit-limit-tokens": "30000",
"x-ratelimit-remaining-requests": "499",
"x-ratelimit-remaining-tokens": "29900",
"x-ratelimit-reset-requests": "1s",
"x-ratelimit-reset-tokens": "10s",
},
}),
),
),
),
),
)
it.effect("extracts Anthropic-style rate-limit diagnostics", () =>
Effect.gen(function* () {
const executor = yield* RequestExecutor.Service
const error = yield* executor.execute(request).pipe(Effect.flip)
expectLLMError(error)
expect(error.reason).toMatchObject({ _tag: "ProviderInternal" })
expect(errorHttp(error)?.rateLimit).toEqual({
retryAfterMs: 0,
limit: { requests: "100", "input-tokens": "10000" },
remaining: { requests: "12", "input-tokens": "9000" },
reset: { requests: "2026-05-06T12:00:00Z", "input-tokens": "2026-05-06T12:00:10Z" },
})
}).pipe(
Effect.provide(
responsesLayer(
Array.from(
{ length: 3 },
() =>
new Response("overloaded", {
status: 529,
headers: {
"retry-after-ms": "0",
"anthropic-ratelimit-requests-limit": "100",
"anthropic-ratelimit-requests-remaining": "12",
"anthropic-ratelimit-requests-reset": "2026-05-06T12:00:00Z",
"anthropic-ratelimit-input-tokens-limit": "10000",
"anthropic-ratelimit-input-tokens-remaining": "9000",
"anthropic-ratelimit-input-tokens-reset": "2026-05-06T12:00:10Z",
},
}),
),
),
),
),
)
it.effect("retries retryable status responses before returning the stream", () =>
Effect.gen(function* () {
const executor = yield* RequestExecutor.Service
const response = yield* executor.execute(request)
expect(response.status).toBe(200)
expect(yield* response.text).toBe("ok")
}).pipe(
Effect.provide(
responsesLayer([
new Response("busy", { status: 503, headers: { "retry-after-ms": "0" } }),
new Response("ok", { status: 200 }),
]),
),
),
)
it.effect("marks 504 and 529 status responses retryable", () =>
Effect.gen(function* () {
const failWith = (status: number) =>
Effect.gen(function* () {
const executor = yield* RequestExecutor.Service
const error = yield* executor.execute(request).pipe(Effect.flip)
expectLLMError(error)
expect(error.reason).toMatchObject({ _tag: "ProviderInternal", status })
expect(error.retryable).toBe(true)
}).pipe(
Effect.provide(
responsesLayer(
Array.from(
{ length: 3 },
() =>
new Response("retry", {
status,
headers: { "retry-after-ms": "0" },
}),
),
),
),
)
yield* failWith(504)
yield* failWith(529)
}),
)
it.effect("does not retry non-retryable status responses and truncates large bodies", () =>
Effect.gen(function* () {
const executor = yield* RequestExecutor.Service
const error = yield* executor.execute(request).pipe(Effect.flip)
expectLLMError(error)
expect(error.reason).toMatchObject({ _tag: "Authentication" })
expect(error.retryable).toBe(false)
expect(errorHttp(error)?.bodyTruncated).toBe(true)
expect(errorHttp(error)?.body).toHaveLength(16_384)
}).pipe(
Effect.provide(
responsesLayer([
new Response("x".repeat(20_000), { status: 401 }),
new Response("should not retry", { status: 200 }),
]),
),
),
)
it.effect("redacts common secret fields in response bodies", () =>
Effect.gen(function* () {
const executor = yield* RequestExecutor.Service
const error = yield* executor.execute(request).pipe(Effect.flip)
expectLLMError(error)
expect(errorHttp(error)?.body).toContain('"key":"<redacted>"')
expect(errorHttp(error)?.body).toContain("api_key=<redacted>")
expect(errorHttp(error)?.body).not.toContain("body-secret")
expect(errorHttp(error)?.body).not.toContain("query-secret")
}).pipe(
Effect.provide(
responsesLayer([
new Response('{"error":{"message":"bad","key":"body-secret","detail":"api_key=query-secret"}}', {
status: 400,
}),
]),
),
),
)
it.effect("redacts echoed request secret values in response bodies", () =>
Effect.gen(function* () {
const executor = yield* RequestExecutor.Service
const error = yield* executor.execute(secretRequest).pipe(Effect.flip)
expectLLMError(error)
expect(errorHttp(error)?.body).toContain("provider echoed <redacted>")
expect(errorHttp(error)?.body).toContain("authorization <redacted>")
expect(errorHttp(error)?.body).not.toContain("query-secret-123")
expect(errorHttp(error)?.body).not.toContain("header-secret-456")
}).pipe(
Effect.provide(
responsesLayer([
new Response("provider echoed query-secret-123 and authorization header-secret-456", { status: 400 }),
]),
),
),
)
it.effect("honors Retry-After delta seconds before retrying", () =>
Effect.gen(function* () {
const attempts = yield* Ref.make(0)
return yield* Effect.gen(function* () {
const executor = yield* RequestExecutor.Service
const fiber = yield* executor.execute(request).pipe(Effect.forkChild)
yield* Effect.yieldNow
expect(yield* Ref.get(attempts)).toBe(1)
yield* TestClock.adjust(1_999)
yield* Effect.yieldNow
expect(yield* Ref.get(attempts)).toBe(1)
yield* TestClock.adjust(1)
const response = yield* Fiber.join(fiber)
expect(response.status).toBe(200)
expect(yield* Ref.get(attempts)).toBe(2)
}).pipe(
Effect.provide(
countedResponsesLayer(attempts, [
new Response("busy", { status: 503, headers: { "retry-after": "2" } }),
new Response("ok", { status: 200 }),
]),
),
)
}),
)
it.effect("uses exponential jittered delay when retry-after is absent", () =>
Effect.gen(function* () {
const attempts = yield* Ref.make(0)
return yield* Effect.gen(function* () {
const executor = yield* RequestExecutor.Service
const fiber = yield* executor.execute(request).pipe(Effect.flip, Effect.forkChild)
yield* Effect.yieldNow
expect(yield* Ref.get(attempts)).toBe(1)
yield* TestClock.adjust(499)
yield* Effect.yieldNow
expect(yield* Ref.get(attempts)).toBe(1)
yield* TestClock.adjust(1)
yield* Effect.yieldNow
expect(yield* Ref.get(attempts)).toBe(2)
yield* TestClock.adjust(999)
yield* Effect.yieldNow
expect(yield* Ref.get(attempts)).toBe(2)
yield* TestClock.adjust(1)
const error = yield* Fiber.join(fiber)
expectLLMError(error)
expect(error.reason).toMatchObject({ _tag: "ProviderInternal" })
expect(yield* Ref.get(attempts)).toBe(3)
}).pipe(
Effect.provide(
countedResponsesLayer(attempts, [
new Response("busy", { status: 503 }),
new Response("still busy", { status: 503 }),
new Response("done retrying", { status: 503 }),
]),
),
)
}).pipe(Effect.provideService(Random.Random, randomMidpoint)),
)
it.effect("does not retry after a successful response reaches stream parsing", () =>
Effect.gen(function* () {
const attempts = yield* Ref.make(0)
const model = OpenAIChat.route
.with({ endpoint: { baseURL: "https://api.openai.test/v1" } })
.model({ id: "gpt-4o-mini" })
const error = yield* LLMClient.generate(LLM.request({ model, prompt: "Say hello." })).pipe(
Effect.provide(
dynamicResponse((input) =>
Ref.update(attempts, (value) => value + 1).pipe(
Effect.as(
input.respond(
sseRaw(
`data: ${JSON.stringify(deltaChunk({ role: "assistant", content: "Hello" }))}`,
"data: not-json",
),
{ headers: { "content-type": "text/event-stream" } },
),
),
),
),
),
Effect.flip,
)
expectLLMError(error)
expect(error.reason).toMatchObject({ _tag: "InvalidProviderOutput" })
expect(yield* Ref.get(attempts)).toBe(1)
}),
)
})
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