bun.sh/test/js/web/fetch/fetch-leak.test.ts

import { describe, expect, test } from "bun:test";
import { bunEnv, bunExe, tls as COMMON_CERT, gc } from "harness";
import { once } from "node:events";
import { createServer } from "node:http";
import { join } from "node:path";

describe("fetch doesn't leak", () => {
  test("fixture #1", async () => {
    const body = new Blob(["some body in here!".repeat(100)]);
    var count = 0;
    using server = Bun.serve({
      port: 0,
      idleTimeout: 0,
      fetch(req) {
        count++;
        return new Response(body);
      },
    });

    const proc = Bun.spawn({
      env: {
        ...bunEnv,
        SERVER: server.url.href,
        COUNT: "200",
      },
      stderr: "inherit",
      stdout: "inherit",
      cmd: [bunExe(), "--smol", join(import.meta.dir, "fetch-leak-test-fixture.js")],
    });

    const exitCode = await proc.exited;
    expect(exitCode).toBe(0);
    expect(count).toBe(200);
  });

  // This tests for body leakage and Response object leakage.
  async function runTest(compressed, name) {
    const body = !compressed
      ? new Blob(["some body in here!".repeat(2000000)])
      : new Blob([Bun.deflateSync(crypto.getRandomValues(new Buffer(65123)))]);

    const tls = name.includes("tls");
    const headers = {
      "Content-Type": "application/octet-stream",
    };
    if (compressed) {
      headers["Content-Encoding"] = "deflate";
    }

    const serveOptions = {
      port: 0,
      idleTimeout: 0,
      fetch(req) {
        return new Response(body, { headers });
      },
    };

    if (tls) {
      serveOptions.tls = { ...COMMON_CERT };
    }

    using server = Bun.serve(serveOptions);

    const env = {
      ...bunEnv,
      SERVER: server.url.href,
      BUN_JSC_forceRAMSize: (1024 * 1024 * 64).toString(10),
      NAME: name,
    };

    if (tls) {
      env.NODE_TLS_REJECT_UNAUTHORIZED = "0";
    }

    if (compressed) {
      env.COUNT = "1000";
    }

    const proc = Bun.spawn({
      env,
      stderr: "inherit",
      stdout: "inherit",
      cmd: [bunExe(), "--smol", join(import.meta.dir, "fetch-leak-test-fixture-2.js")],
    });

    const exitCode = await proc.exited;
    expect(exitCode).toBe(0);
  }

  for (let compressed of [true, false]) {
    describe(compressed ? "compressed" : "uncompressed", () => {
      for (let name of ["tcp", "tls", "tls-with-client"]) {
        describe(name, () => {
          test("fixture #2", async () => {
            await runTest(compressed, name);
          }, 100000);
        });
      }
    });
  }
});

describe.each(["FormData", "Blob", "Buffer", "String", "URLSearchParams", "stream", "iterator"])("Sending %s", type => {
  test(
    "does not leak",
    async () => {
      using server = Bun.serve({
        port: 0,
        idleTimeout: 0,
        fetch(req) {
          return new Response();
        },
      });

      const rss = [];

      const process = Bun.spawn({
        cmd: [
          bunExe(),
          "--smol",
          join(import.meta.dir, "fetch-leak-test-fixture-5.js"),
          server.url.href,
          1024 * 1024 * 2 + "",
          type,
        ],
        stdin: "ignore",
        stdout: "inherit",
        stderr: "inherit",
        env: {
          ...bunEnv,
        },
        ipc(message) {
          rss.push(message.rss);
        },
      });

      await process.exited;

      const first = rss[0];
      const last = rss[rss.length - 1];
      console.log({ rss, delta: (((last - first) / 1024 / 1024) | 0) + " MB" });
      expect(last).toBeLessThan(first * 10);
    },
    20 * 1000,
  );
});

test("do not leak", async () => {
  await using server = createServer((req, res) => {
    res.end();
  }).listen(0);
  await once(server, "listening");

  let url;
  let isDone = false;
  server.listen(0, "127.0.0.1", function attack() {
    if (isDone) {
      return;
    }
    url ??= new URL(`http://127.0.0.1:${server.address().port}`);
    const controller = new AbortController();
    fetch(url, { signal: controller.signal })
      .then(res => res.arrayBuffer())
      .catch(() => {})
      .then(attack);
  });

  let prev = Infinity;
  let count = 0;
  var interval = setInterval(() => {
    isDone = true;
    gc();
    const next = process.memoryUsage().heapUsed;
    if (next <= prev) {
      expect(true).toBe(true);
      clearInterval(interval);
    } else if (count++ > 20) {
      clearInterval(interval);
      expect.unreachable();
    } else {
      prev = next;
    }
  }, 1e3);
});