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feat(node): add
webToNodeHandler
(#252)
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import { createServer } from "node:http"; | ||
import { createManualPromise, tinyassert } from "@hiogawa/utils"; | ||
import { describe, expect, test, vi } from "vitest"; | ||
import { type WebHandler, webToNodeHandler } from "./http"; | ||
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describe(webToNodeHandler, () => { | ||
test("basic", async () => { | ||
const abortFn = vi.fn(); | ||
await using server = await testWebHandler((request) => { | ||
request.signal.addEventListener("abort", () => { | ||
abortFn("abort"); | ||
}); | ||
const body = "hello = " + new URL(request.url).pathname; | ||
return new Response(body, { | ||
headers: { "content-type": "text/x-hello" }, | ||
}); | ||
}); | ||
const res = await fetch(server.url + "/abc"); | ||
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expect(server.nextFn.mock.calls).toMatchInlineSnapshot(`[]`); | ||
expect(abortFn.mock.calls).toMatchInlineSnapshot(`[]`); | ||
expect(res.headers.get("content-type")).toMatchInlineSnapshot( | ||
`"text/x-hello"` | ||
); | ||
expect(await res.text()).toMatchInlineSnapshot(`"hello = /abc"`); | ||
}); | ||
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||
test("stream", async () => { | ||
// https://github.com/hi-ogawa/reproductions/pull/9 | ||
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const trackFn = vi.fn(); | ||
const abortPromise = createManualPromise<void>(); | ||
const cancelPromise = createManualPromise<void>(); | ||
async function handler(req: Request) { | ||
let aborted = false; | ||
req.signal.addEventListener("abort", () => { | ||
trackFn("abort"); | ||
abortPromise.resolve(); | ||
aborted = true; | ||
}); | ||
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let cancelled = false; | ||
const stream = new ReadableStream<string>({ | ||
async start(controller) { | ||
for (let i = 0; !aborted && !cancelled; i++) { | ||
controller.enqueue(`i = ${i}\n`); | ||
await new Promise((resolve) => setTimeout(resolve, 200)); | ||
} | ||
controller.close(); | ||
}, | ||
cancel() { | ||
trackFn("cancel"); | ||
cancelPromise.resolve(); | ||
cancelled = true; | ||
}, | ||
}); | ||
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return new Response(stream.pipeThrough(new TextEncoderStream())); | ||
} | ||
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await using server = await testWebHandler(handler); | ||
const abortController = new AbortController(); | ||
const res = await fetch(server.url, { signal: abortController.signal }); | ||
tinyassert(res.ok); | ||
tinyassert(res.body); | ||
const chunks: string[] = []; | ||
const promise = res.body.pipeThrough(new TextDecoderStream()).pipeTo( | ||
new WritableStream({ | ||
write(chunk) { | ||
chunks.push(chunk); | ||
if (chunk.includes("i = 2")) { | ||
abortController.abort(); | ||
} | ||
}, | ||
}) | ||
); | ||
await expect(promise).rejects.toMatchInlineSnapshot( | ||
`[AbortError: This operation was aborted]` | ||
); | ||
expect(chunks).toMatchInlineSnapshot(` | ||
[ | ||
"i = 0 | ||
", | ||
"i = 1 | ||
", | ||
"i = 2 | ||
", | ||
] | ||
`); | ||
await Promise.all([abortPromise, cancelPromise]); | ||
expect(trackFn.mock.calls).toMatchInlineSnapshot(` | ||
[ | ||
[ | ||
"abort", | ||
], | ||
[ | ||
"cancel", | ||
], | ||
] | ||
`); | ||
expect(server.nextFn.mock.calls).toMatchInlineSnapshot(`[]`); | ||
}); | ||
}); | ||
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async function testWebHandler(handler: WebHandler) { | ||
// node server | ||
const nextFn = vi.fn(); | ||
const nodeHandler = webToNodeHandler(handler); | ||
const server = createServer((req, res) => nodeHandler(req, res, nextFn)); | ||
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// listen | ||
await new Promise<void>((resolve) => server.listen(() => resolve())); | ||
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// get address | ||
const address = server.address(); | ||
tinyassert(address); | ||
tinyassert(typeof address !== "string"); | ||
const url = `http://localhost:${address.port}`; | ||
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return { | ||
url, | ||
nextFn, | ||
[Symbol.asyncDispose]: () => server[Symbol.asyncDispose](), | ||
}; | ||
} |
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import type http from "node:http"; | ||
import { Readable } from "node:stream"; | ||
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// https://github.com/hattipjs/hattip/blob/69237d181300b200a14114df2c3c115c44e0f3eb/packages/adapter/adapter-node/src/common.ts | ||
// https://github.com/remix-run/remix/blob/6eb6acf3f065f4574fbc96e4e8879482ce77b560/packages/remix-express/server.ts | ||
// https://github.com/honojs/node-server/blob/becc420b5d4ea51977a8e5b12e945ceb09c2ee9a/src/listener.ts | ||
// https://github.com/Shopify/hydrogen/blob/adc840f584129968d1710d494d19165e6664a60d/packages/mini-oxygen/src/vite/utils.ts | ||
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export type WebHandler = ( | ||
request: Request | ||
) => Response | undefined | Promise<Response | undefined>; | ||
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export type NodeHandler = ( | ||
req: http.IncomingMessage, | ||
res: http.ServerResponse, | ||
next: (error?: unknown) => void | ||
) => void; | ||
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export function webToNodeHandler(handler: WebHandler): NodeHandler { | ||
return async (req, res, next) => { | ||
try { | ||
const request = createRequest(req, res); | ||
const response = await handler(request); | ||
if (response) { | ||
sendResponse(response, res); | ||
} else { | ||
next(); | ||
} | ||
} catch (e) { | ||
next(e); | ||
} | ||
}; | ||
} | ||
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function createRequest( | ||
req: http.IncomingMessage, | ||
res: http.ServerResponse | ||
): Request { | ||
// cf. hono | ||
const abortController = new AbortController(); | ||
res.once("close", () => { | ||
if (req.destroyed) { | ||
abortController.abort(); | ||
} | ||
}); | ||
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// cf. hattip, remix | ||
const headers = new Headers(); | ||
for (const [k, v] of Object.entries(req.headers)) { | ||
// skip http2 pseudo header since it breaks undici | ||
if (k.startsWith(":")) { | ||
continue; | ||
} | ||
if (typeof v === "string") { | ||
headers.set(k, v); | ||
} else if (Array.isArray(v)) { | ||
v.forEach((v) => headers.append(k, v)); | ||
} | ||
} | ||
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return new Request( | ||
new URL(req.url || "/", `http://${req.headers.host || "unknown.local"}`), | ||
{ | ||
method: req.method, | ||
body: | ||
req.method === "GET" || req.method === "HEAD" | ||
? null | ||
: (Readable.toWeb(req) as any), | ||
headers, | ||
signal: abortController.signal, | ||
// @ts-ignore required for undici ReadableStream body | ||
duplex: "half", | ||
} | ||
); | ||
} | ||
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function sendResponse(response: Response, res: http.ServerResponse) { | ||
// cf. hydrogen | ||
const headers = Object.fromEntries(response.headers); | ||
if (headers["set-cookie"]) { | ||
delete headers["set-cookie"]; | ||
res.setHeader("set-cookie", response.headers.getSetCookie()); | ||
} | ||
res.writeHead(response.status, response.statusText, headers); | ||
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const body = response.body; | ||
if (body) { | ||
const abortController = new AbortController(); | ||
res.once("close", () => abortController.abort()); | ||
const nodeBody = Readable.fromWeb(body as any, { | ||
signal: abortController.signal, | ||
}); | ||
nodeBody.pipe(res); | ||
} else { | ||
res.end(); | ||
} | ||
} |
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@@ -1,3 +1,4 @@ | ||
export * from "./script"; | ||
export * from "./prompt"; | ||
export * from "./parse-args"; | ||
export * from "./http"; |
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import { defineConfig } from "vitest/config"; | ||
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export default defineConfig({ | ||
esbuild: { | ||
// transpile `using` | ||
target: "es2022", | ||
}, | ||
}); |