mirror of
https://github.com/clusterio/clusterio.git
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Hornwitser
5dcaca4d0b
Migrate the usage of CommonJS specific code and imports to ESM. Roughly summarised this: - Changes all require() calls to import statement or expressions. - Changes usage of module.exports to export statements. - Replaces require.resolve with import.meta.resolve. - Replaces conditional imports with conditional subpath imports. - Replaces module === require.main with import.meta.main. - Adds the full filename with extention to all relative imports. - Changes all usage of __dirname and __filename to their import.meta equivalents. - Sets "type": "module" in package.json files. - Removes usage of "use strict". - Adds .ts an an alias of .js for the webpack build. Due to differences in how require and import resolves files the plugin entrypoints will have to include the filename and extension after this migration in order to work.
128 lines
3.1 KiB
JavaScript
128 lines
3.1 KiB
JavaScript
import assert from "node:assert/strict";
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import { ValueCache, wait } from "@clusterio/lib";
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describe("ValueCache", function () {
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describe("constructor", function () {
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it("constructs with a fetch function", function() {
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const fetcher = async () => 42;
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const cache = new ValueCache(fetcher);
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assert.ok(cache);
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});
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});
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describe("get", function() {
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it("throws TypeError for negative maxAgeMs", async function() {
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const fetcher = async () => 42;
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const cache = new ValueCache(fetcher);
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assert.throws(() => cache.get(-1), err => {
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assert.equal(err instanceof TypeError, true);
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assert.match(String(err.message), /maxAgeMs/);
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return true;
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});
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});
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it("uses a default of 0 for maxAgeMs", async function() {
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let callCount = 0;
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const fetcher = async () => {
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callCount += 1;
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return callCount;
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};
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const cache = new ValueCache(fetcher);
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const v1 = await cache.get();
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const v2 = await cache.get();
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assert.equal(v1, 1);
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assert.equal(v2, 2);
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assert.equal(callCount, 2);
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});
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it("returns cached value when within maxAgeMs", async function() {
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let callCount = 0;
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const fetcher = async () => {
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callCount += 1;
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return callCount;
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};
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const cache = new ValueCache(fetcher);
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const v1 = await cache.get(1000);
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const v2 = await cache.get(1000);
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assert.equal(v1, 1);
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assert.equal(v2, 1);
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assert.equal(callCount, 1);
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});
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it("refreshes the cache when older than maxAgeMs", async function() {
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let callCount = 0;
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const fetcher = async () => {
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callCount += 1;
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return callCount;
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};
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const cache = new ValueCache(fetcher);
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const v1 = await cache.get(50);
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const v2 = await cache.get(1000); // Use cached value
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await wait(100);
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const v3 = await cache.get(50); // Stale after 100ms wait
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const v4 = await cache.get(1000); // Use cached value
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assert.equal(v1, 1);
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assert.equal(v2, 1);
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assert.equal(v3, 2);
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assert.equal(v4, 2);
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assert.equal(callCount, 2);
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});
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it("shares in-flight fetch between concurrent callers", async function() {
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let callCount = 0;
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let resolveFetcher;
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const fetcher = () => (
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new Promise(resolve => {
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callCount += 1;
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resolveFetcher = resolve;
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})
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);
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const cache = new ValueCache(fetcher);
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const p1 = cache.get(1000);
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const p2 = cache.get(1000);
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assert.equal(callCount, 1);
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resolveFetcher(42);
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const [v1, v2] = await Promise.all([p1, p2]);
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assert.equal(v1, 42);
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assert.equal(v2, 42);
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assert.equal(callCount, 1);
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});
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it("propagates errors from the fetcher and clears ongoing fetch", async function() {
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let callCount = 0;
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const error = new Error("fetch failed");
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const fetcher = async () => {
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callCount += 1;
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throw error;
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};
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const cache = new ValueCache(fetcher);
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await assert.rejects(cache.get(), err => {
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assert.equal(err, error);
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return true;
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});
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assert.equal(callCount, 1);
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// After a failure, a new attempt to fetch should be made
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await assert.rejects(cache.get(), err => {
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assert.equal(err, error);
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return true;
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});
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assert.equal(callCount, 2);
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});
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});
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});
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