testFetchesAreCappedAndOnlyWhatsAsked

tcmts.cli.sync.test.testFetchesAreCappedAndOnlyWhatsAsked · #plyvaz3d · term

A fetch capped by what its namespaces name stops before fetching any code, and a server sending namespaces it wasn't asked for is refused.

import { Codebase } from "#codebase/tcmts/cli/codebase";
import { fetchNamespaces } from "#codebase/tcmts/cli/sync";
import type { Remote } from "#codebase/tcmts/cli/sync";
import { tempDir } from "#codebase/tcmts/cli/test/e2e/harness";
import assert from "node:assert/strict";

export const testFetchesAreCappedAndOnlyWhatsAsked = async () => {
  const session = process.env.TCM_BRANCH;
  delete process.env.TCM_BRANCH;
  try {
    const cb = Codebase.init(tempDir("capped fetch"));
    const body = JSON.stringify([
      "ns",
      [
        ["a", ["h1"]],
        ["b", ["h2"]],
        ["c", ["h3"]],
      ],
      [],
    ]);
    let fetchedCode = false;
    const remote = {
      label: "a server",
      getNamespaces: async (hs: string[]) => hs.map((hash) => ({ hash, body })),
      get: async () => {
        fetchedCode = true;
        return [];
      },
    } as unknown as Remote;
    await assert.rejects(
      fetchNamespaces(cb, remote, ["root"], { maxNames: 2 }),
      /names more than 2 definitions/,
    );
    assert.equal(fetchedCode, false);
    const liar = {
      label: "a liar",
      getNamespaces: async () => [{ hash: "another", body }],
    } as unknown as Remote;
    await assert.rejects(
      fetchNamespaces(cb, liar, ["root"]),
      /sent namespaces it wasn't asked for/,
    );
  } finally {
    if (session !== undefined) process.env.TCM_BRANCH = session;
  }
}

testFetchesAreCappedAndOnlyWhatsAsked

uses