mirror of
https://github.com/badlogic/pi-mono.git
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e9c0ff4d84
src/next is src (the main export), src/next-node is src/node with short subpaths (/http, /workers, /plugins, /plugins/runtime, /app, /surfaces, /web, /react, /tui, /tui/launcher); the foundations get /json and /watch; Chord v1 moves to src/old (/old, /old/node) until p2 runs on v2; tests and docs move likewise (test/, docs/, test/old, docs/old). Durable and env import the foundations from their subpaths.
210 lines
8 KiB
TypeScript
210 lines
8 KiB
TypeScript
import { getEventListeners } from "node:events";
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import { describe, expect, it } from "vitest";
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import { BACKGROUND_CONTEXT as context, withAbortSignal } from "../../src/context/index.ts";
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import { int, local, method } from "../../src/contracts/index.ts";
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import type { ChordHost } from "../../src/host/host.ts";
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import type { Self } from "../../src/host/index.ts";
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import { ChordObject } from "../../src/host/object.ts";
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import { defineRegistry } from "../../src/registries/index.ts";
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import type { Writable } from "../../src/state/index.ts";
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import type { WritableSource } from "../../src/state/internal.ts";
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import type { NativeWatchCall, WatchEnd } from "../../src/watch.ts";
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import { delivered, expectCollected, instancesOf, loaded, metered, rejection, restartable } from "../support.ts";
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const objects = instancesOf(ChordObject, "attempt");
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const Counter = local("app.counter", { version: 1, params: {}, members: { doubled: int(), set: method(int()) } });
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/** Serves `Counter` with a writable number, its double as a state member; the writable is handed out to the test. */
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async function counter(options: Parameters<typeof loaded>[1] = {}) {
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let writable: Writable<number> | undefined;
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let self: Self | undefined;
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const { host, errors } = await loaded((h) => {
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h.serve(Counter, (_, made) => {
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self = made;
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const value = made.writable(1);
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writable = value;
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return {
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doubled: made.derive([value], ([n]) => n * 2),
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set: async (n: number) => {
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value.set(n);
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return null;
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},
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};
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});
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}, options);
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const reference = await host.get(Counter, {}, context);
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return { host, errors, reference, writable: writable!, self: self! };
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}
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describe("writable", () => {
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it("a new value (by identity) is a new frame; the same value notifies nobody and costs one comparison", async () => {
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const { telemetry, counts } = await metered();
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const { host, reference, writable } = await counter({ telemetry });
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const calls: NativeWatchCall<number>[] = [];
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(await writable.watch(context)).start(async (call) => void calls.push(call));
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const doubled: number[] = [];
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(await reference.doubled.watch(context)).start(
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async (call) => void (call.kind === "value" && doubled.push(call.value)),
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);
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const computes = counts()["chord.derive.computes"];
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writable.set(1);
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await delivered();
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expect(calls).toEqual([]);
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expect(counts()["chord.derive.computes"]).toBe(computes);
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writable.set(2);
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writable.set(3);
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await delivered();
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expect(calls).toEqual([
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{ kind: "value", value: 2 },
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{ kind: "value", value: 3 },
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]);
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// A JSON watch folds what came while it waited: the derive's last value.
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expect(doubled).toEqual([6]);
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expect(writable.value).toBe(3);
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await host.close(context);
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});
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it("inside a batch, sets mark it there: one frame with the last value, the derives over it computed once", async () => {
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const { telemetry, counts } = await metered();
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const { host, reference, writable } = await counter({ telemetry });
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const calls: NativeWatchCall<number>[] = [];
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(await writable.watch(context)).start(async (call) => void calls.push(call));
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const doubled: number[] = [];
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(await reference.doubled.watch(context)).start(
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async (call) => void (call.kind === "value" && doubled.push(call.value)),
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);
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const computes = counts()["chord.derive.computes"]!;
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(host as unknown as ChordHost).batch.commit(() => {
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writable.set(5);
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writable.set(6);
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}, context);
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await delivered();
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expect(calls).toEqual([{ kind: "value", value: 6 }]);
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expect(doubled).toEqual([12]);
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expect(counts()["chord.derive.computes"]).toBe(computes + 1);
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await host.close(context);
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});
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it("refuses a set inside a derive compute or a compose (`invalid/reentrant`)", async () => {
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const Echo = defineRegistry<number, number>("app.echo", { version: 1 });
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let inner: Writable<number> | undefined;
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const Bad = local("app.bad", { version: 1, params: {}, members: { bad: int() } });
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const Good = local("app.good", { version: 1, params: {}, members: {} });
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const { host, errors } = await loaded((h) => {
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h.serve(Echo, {
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compose: (table) => {
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inner?.set(table.length + 100);
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return table.length;
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},
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});
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h.serve(Good, (_, self) => {
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inner = self.writable(0);
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self.contribute(Echo, inner);
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return {};
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});
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h.serve(Bad, (_, self) => {
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const own = self.writable(0);
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return {
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bad: self.derive([own], ([n]) => {
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own.set(n + 1);
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return n;
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}),
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};
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});
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});
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expect((await host.registry(Echo, context)).value).toBe(0);
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expect(errors.find((error) => error.kind === "registry_failed")).toMatchObject({
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error: { code: "invalid", reason: "reentrant" },
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});
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expect(errors.find((error) => error.kind === "activation_failed")).toMatchObject({
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object: "app.bad",
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failure: { kind: "broken", error: { code: "invalid", reason: "reentrant" } },
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});
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await host.close(context);
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});
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it("is the attempt's: `set` after its end throws `released`, its watches end `ended`, its value stays readable", async () => {
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let writable: Writable<number> | undefined;
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const { host, restart } = await restartable(objects, (attempt, self) => {
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if (attempt === 1) writable = self.writable(1);
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});
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const watch = await writable!.watch(context);
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await restart();
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expect(await watch.closed).toEqual({ kind: "ended" } satisfies WatchEnd);
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expect(() => writable!.set(2)).toThrow("app.restartable(1): ended");
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expect(writable!.value).toBe(1);
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await host.close(context);
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});
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it("is a contribution, a derive source and an `on` source", async () => {
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const Values = defineRegistry<number, readonly number[]>("app.values", { version: 1 });
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const Source = local("app.source", { version: 1, params: {}, members: { set: method(int()), seen: int() } });
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const seen: number[] = [];
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const { host } = await loaded((h) => {
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h.serve(Values, { compose: (table) => table.map(({ value }) => value) });
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h.serve(Source, (_, self) => {
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const value = self.writable(1);
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self.contribute(Values, value);
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self.on(value, ({ value: n }) => void seen.push(n));
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return {
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seen: self.derive([value], ([n]) => n),
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set: async (n: number) => {
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value.set(n);
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return null;
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},
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};
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});
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});
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const source = await host.get(Source, {}, context);
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const values = await host.registry(Values, context);
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await source.set(2, context);
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await delivered();
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expect(values.value).toEqual([2]);
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expect(source.seen.value).toBe(2);
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expect(seen).toEqual([1, 2]);
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await host.close(context);
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});
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it("is collected with its attempt", async () => {
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const refs = await (async () => {
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const made: WeakRef<object>[] = [];
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const { host, restart } = await restartable(objects, (attempt, self) => {
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if (attempt === 1) made.push(new WeakRef(self.writable({ big: new Array(1000).fill(0) })));
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});
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await restart();
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await host.close(context);
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return made;
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})();
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await expectCollected(...refs);
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});
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it("a set of the same value after its attempt ended throws `released` too (Sol, Astra)", async () => {
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const { host, writable } = await counter();
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await host.close(context);
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expect(() => writable.set(1)).toThrow("app.counter: ended");
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});
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it("a writable an app keeps after `host.close` keeps no closed host; its observers' abort listeners go (Sol)", async () => {
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const signal = new AbortController();
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const { weak, writable } = await (async () => {
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const { host, writable } = await counter();
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(writable as WritableSource<number>).observe(
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{ advance: () => {}, end: () => {} },
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withAbortSignal(signal.signal, context),
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);
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expect(getEventListeners(signal.signal, "abort")).toHaveLength(1);
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await host.close(context);
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expect(getEventListeners(signal.signal, "abort")).toHaveLength(0);
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return { weak: new WeakRef(host), writable };
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})();
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await expectCollected(weak);
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expect(writable.value).toBe(1);
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});
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it("a late callback's set after the host closed throws `released`", async () => {
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const { host, writable } = await counter();
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await host.close(context);
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expect(await rejection(Promise.resolve().then(() => writable.set(9)))).toMatchObject({ code: "released" });
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});
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});
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