mirror of
https://github.com/badlogic/pi-mono.git
synced 2026-11-06 23:44:36 +00:00
93029a0f1e
The next object runtime moves from the private repository into pi: src/next (contracts, hosts and objects, documents, derives, links and relays, routines and jobs, the store) with its tests and examples in test/next, src/next-node (Node compression), and its design in docs/next (design.md, the decision log decisions.md, the slice plan slices.md, slice specs, books and benchmarks). AGENTS.md gets its code style. Not exported: the API changes with every slice until it has an entry point.
102 lines
3.8 KiB
TypeScript
102 lines
3.8 KiB
TypeScript
// Export and import: `store.export(ctx)` yields the store's state as archive parts (lossless: tables with their rows
|
|
// and versions, the live documents), holding the commit queue while it runs; `encodeJsonl` turns them into JSONL.
|
|
// `importStore` checks an archive part by part and makes a new store from it in one backend transaction.
|
|
// Run from packages/chord:
|
|
// node --conditions=source --experimental-strip-types test/next/examples/25-export-import.ts
|
|
import { createReadStream, createWriteStream } from "node:fs";
|
|
import { mkdtemp, rm, stat } from "node:fs/promises";
|
|
import { tmpdir } from "node:os";
|
|
import { join } from "node:path";
|
|
import { pipeline } from "node:stream/promises";
|
|
import { BACKGROUND_CONTEXT } from "../../../src/context/index.ts";
|
|
import { int, local, method, obj, str } from "../../../src/next/contracts/index.ts";
|
|
import { defineState } from "../../../src/next/documents/index.ts";
|
|
import { createHost, defineFacet, type Reference } from "../../../src/next/host/index.ts";
|
|
import {
|
|
decodeJsonl,
|
|
defineTable,
|
|
encodeJsonl,
|
|
importStore,
|
|
openStore,
|
|
type Store,
|
|
sqliteBackend,
|
|
} from "../../../src/next/store/index.ts";
|
|
import { openNodeSqliteDatabase } from "../../../src/sqlite/node.ts";
|
|
|
|
const context = BACKGROUND_CONTEXT;
|
|
|
|
const Visits = defineTable("visits", { version: 1, columns: { page: str(), count: int() }, key: ["page"] });
|
|
const Title = defineState("title", {
|
|
schema: obj({ text: str() }),
|
|
version: 1,
|
|
initial: () => ({ text: "untitled" }),
|
|
persist: true,
|
|
checkpointWhen: () => false,
|
|
});
|
|
|
|
const Site = local("example.site", {
|
|
version: 1,
|
|
params: {},
|
|
members: {
|
|
title: obj({ text: str() }),
|
|
visit: method(str(), int()),
|
|
rename: method(str()),
|
|
},
|
|
});
|
|
|
|
const facet = defineFacet((host) => {
|
|
host.serve(Site, (_, self) => {
|
|
const visits = self.table(Visits);
|
|
const title = self.state(Title);
|
|
return {
|
|
title,
|
|
visit: async (page, ctx) =>
|
|
self.tx(async (tx) => {
|
|
const count = ((await tx.get(visits, { page }))?.count ?? 0) + 1;
|
|
tx.put(visits, { page, count });
|
|
return count;
|
|
}, ctx),
|
|
rename: async (text, ctx) => {
|
|
await title.change((draft) => {
|
|
draft.text = text;
|
|
}, ctx);
|
|
return null;
|
|
},
|
|
};
|
|
});
|
|
});
|
|
|
|
/** A host on `store` serving the site, run until `work` is done. */
|
|
async function serve(store: Store, work: (site: Reference<typeof Site>) => Promise<void>) {
|
|
const host = createHost({ store, onError: (error) => console.error("background error:", error) });
|
|
await host.load([{ name: "@example/site", facet }], context);
|
|
await work(await host.get(Site, {}, context));
|
|
await host.close(context);
|
|
}
|
|
|
|
const directory = await mkdtemp(join(tmpdir(), "chord-example-"));
|
|
try {
|
|
const original = await openStore(sqliteBackend(await openNodeSqliteDatabase(join(directory, "a.db"))), context);
|
|
await serve(original, async (site) => {
|
|
await site.rename("Chord", context);
|
|
await site.visit("/", context);
|
|
await site.visit("/", context);
|
|
await site.visit("/docs", context);
|
|
});
|
|
// Export to a local file (then upload it, if needed): the queue is held only while the parts are read.
|
|
const archive = join(directory, "archive.jsonl");
|
|
await pipeline(encodeJsonl(original.export(context)), createWriteStream(archive));
|
|
console.log("archive:", (await stat(archive)).size, "bytes at seq", original.lastSeq);
|
|
await original.close(context);
|
|
|
|
// Import into an empty backend: every part is checked; a refused archive leaves the backend empty.
|
|
const parts = decodeJsonl(createReadStream(archive));
|
|
const copy = await importStore(sqliteBackend(await openNodeSqliteDatabase(join(directory, "b.db"))), parts, context);
|
|
console.log("imported at seq", copy.lastSeq);
|
|
await serve(copy, async (site) => {
|
|
console.log("title:", site.title.value.text, "- next visit of /:", await site.visit("/", context));
|
|
});
|
|
await copy.close(context);
|
|
} finally {
|
|
await rm(directory, { recursive: true, force: true });
|
|
}
|