99 lines
2.4 KiB
TypeScript
99 lines
2.4 KiB
TypeScript
import Debug from 'debug';
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import {Delta, PointerTarget} from "../src/delta.js";
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import {lastValueFromDeltas} from "../src/last-write-wins.js";
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import {Lossless, LosslessViewOne} from "../src/lossless.js";
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import {Lossy, valueFromCollapsedDelta} from "../src/lossy.js";
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import {RhizomeNode} from "../src/node.js";
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const debug = Debug('test:lossy');
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type Role = {
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actor: PointerTarget,
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film: PointerTarget,
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role: PointerTarget
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};
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type Summary = {
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roles: Role[];
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};
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function initializer(): Summary {
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return {
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roles: []
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};
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}
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// TODO: Add more rigor to this example approach to generating a summary.
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// it's really not CRDT, it likely depends on the order of the pointers.
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// TODO: Prove with failing test
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const reducer = (acc: Summary, cur: LosslessViewOne): Summary => {
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if (cur.referencedAs.includes("role")) {
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const {delta, value: actor} = lastValueFromDeltas("actor", cur.propertyDeltas["actor"]) ?? {};
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if (!delta) throw new Error('expected to find delta');
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if (!actor) throw new Error('expected to find actor');
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const film = valueFromCollapsedDelta("film", delta);
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if (!film) throw new Error('expected to find film');
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acc.roles.push({
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role: cur.id,
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actor,
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film
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});
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}
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return acc;
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}
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const resolver = (acc: Summary): Summary => {
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return acc;
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}
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describe('Lossy', () => {
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describe('use a provided initializer, reducer, and resolver to resolve entity views', () => {
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const node = new RhizomeNode();
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const lossless = new Lossless(node);
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const lossy = new Lossy(lossless, initializer, reducer, resolver);
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beforeAll(() => {
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lossless.ingestDelta(new Delta({
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creator: 'a',
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host: 'h',
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pointers: [{
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localContext: "actor",
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target: "keanu",
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targetContext: "roles"
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}, {
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localContext: "role",
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target: "neo",
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targetContext: "actor"
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}, {
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localContext: "film",
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target: "the_matrix",
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targetContext: "cast"
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}, {
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localContext: "base_salary",
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target: 1000000
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}, {
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localContext: "salary_currency",
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target: "usd"
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}]
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}));
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});
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it('example summary', () => {
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const result = lossy.resolve();
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debug('result', result);
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expect(result).toEqual({
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roles: [{
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film: "the_matrix",
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role: "neo",
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actor: "keanu"
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}]
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});
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});
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});
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});
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