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// NodeJS does not have fetch
import fetch from 'node-fetch';
// eslint-disable-next-line @typescript-eslint/no-explicit-any
(globalThis as any).fetch = fetch;
import {ReadableStream} from 'web-streams-polyfill';
// eslint-disable-next-line @typescript-eslint/no-explicit-any
(globalThis as any).ReadableStream = ReadableStream;
import {open} from 'fs/promises';
import type {FileHandle} from 'fs/promises';
import {ReplicacheTest, httpStatusUnauthorized} from './replicache.js';
import {REPMHTTPInvoker} from './mod.js';
import type {REPMInvoke, ReadTransaction, WriteTransaction} from './mod.js';
import type {JSONValue, ToJSON} from './json.js';
import type {
InvokeMapNoArgs,
InvokeMap,
BeginSyncResponse,
} from './repm-invoker.js';
import type {ScanItem} from './scan-item.js';
let rep: ReplicacheTest | null = null;
let rep2: ReplicacheTest | null = null;
type ReplayResult = JSONValue;
type Replay = {
method: string;
dbName: string;
args: JSONValue | ToJSON;
result: ReplayResult;
};
type ReplayInput = Omit<Replay, 'result'>;
function replayMatches(
r: Replay,
dbName: string,
method: string,
args: JSONValue,
): boolean {
return (
r.method === method &&
r.dbName === dbName &&
JSON.stringify(r.args) === JSON.stringify(args)
);
}
let fixtureFile: FileHandle | undefined;
let replays: Replay[];
async function useReplay(name: string): Promise<void> {
function ff() {
return open(
`${__dirname}/fixtures/${name}.json`,
testMode === 'record' ? 'w' : 'r',
);
}
switch (testMode) {
case 'replay': {
fixtureFile = await ff();
const replaysString = await fixtureFile.readFile({encoding: 'utf-8'});
if (replaysString.length === 0) {
replays = [];
} else {
replays = JSON.parse(replaysString);
}
break;
}
case 'record':
fixtureFile = await ff();
replays = [];
break;
case 'live':
break;
}
}
const resultReplacements: {
matcher: (replay: ReplayInput) => boolean;
result: ReplayResult;
}[] = [];
function addResultReplacement(
matcher: (replay: ReplayInput) => boolean,
result: ReplayResult,
) {
if (testMode !== 'replay') {
// We already store the replacements in the json.
resultReplacements.push({matcher, result});
}
}
function maybeReplaceResult(replay: ReplayInput): ReplayResult | undefined {
const i = resultReplacements.findIndex(({matcher}) => matcher(replay));
if (i === -1) {
return undefined;
}
const {result} = resultReplacements[i];
resultReplacements.splice(i, 1);
return result;
}
function invokeMock(invoke: REPMInvoke): REPMInvoke {
return async (...args: Parameters<REPMInvoke>) => {
const [dbName, method, args2 = {}] = args;
const mockResult = maybeReplaceResult({dbName, method, args: args2});
let result: ReplayResult;
if (mockResult !== undefined) {
result = mockResult;
} else {
result = await invoke(dbName, method, args2);
}
return result;
};
}
const httpInvoker = new REPMHTTPInvoker('http://localhost:7002');
const httpInvoke: REPMInvoke = invokeMock(httpInvoker.invoke);
function delay(ms: number): Promise<void> {
return new Promise(res => {
setTimeout(res, ms);
});
}
function recordInvoke<Rpc extends keyof InvokeMapNoArgs>(
dbName: string,
rpc: Rpc,
): Promise<InvokeMapNoArgs[Rpc]>;
function recordInvoke<Rpc extends keyof InvokeMap>(
dbName: string,
rpc: Rpc,
args: InvokeMap[Rpc][0],
): Promise<InvokeMap[Rpc][1]>;
async function recordInvoke(
dbName: string,
rpc: string,
args: JSONValue = {},
): Promise<JSONValue> {
expect(fixtureFile).toBeTruthy();
const result = await httpInvoke(dbName, rpc, args);
replays.push({dbName, method: rpc, args, result});
return result;
}
async function replayInvoke<Rpc extends keyof InvokeMapNoArgs>(
dbName: string,
rpc: Rpc,
): Promise<InvokeMapNoArgs[Rpc]>;
async function replayInvoke<Rpc extends keyof InvokeMap>(
dbName: string,
rpc: Rpc,
args: InvokeMap[Rpc][0],
): Promise<InvokeMap[Rpc][1]>;
async function replayInvoke(
dbName: string,
rpc: string,
args: JSONValue = {},
): Promise<JSONValue> {
expect(fixtureFile).toBeTruthy();
expect(replays).toBeDefined();
const i = replays.findIndex(r => replayMatches(r, dbName, rpc, args));
expect(i).not.toBe(-1);
const replay = replays[i];
replays.splice(i, 1);
// A microtask is not sufficient to emulate the RPC. We need to go to the
// event loop.
await delay(0);
return replay.result;
}
let invoke: REPMInvoke = httpInvoke;
type TestMode = 'live' | 'replay' | 'record';
let testMode: TestMode;
const testModeDefault = 'replay';
switch (process.env['TEST_MODE'] ?? testModeDefault) {
case 'replay':
testMode = 'replay';
invoke = replayInvoke;
break;
case 'live':
testMode = 'live';
invoke = httpInvoke;
break;
case 'record':
testMode = 'record';
invoke = recordInvoke;
break;
default:
fail('Unexpected TEST_MODE');
}
async function replicacheForTesting(
name: string,
{
diffServerURL = 'https://serve.replicache.dev/pull',
dataLayerAuth = '',
diffServerAuth = '',
batchURL = '',
}: {
diffServerURL?: string;
dataLayerAuth?: string;
diffServerAuth?: string;
batchURL?: string;
} = {},
): Promise<ReplicacheTest> {
return await ReplicacheTest.new({
batchURL,
dataLayerAuth,
diffServerAuth,
diffServerURL,
name,
repmInvoke: invoke,
});
}
async function addData(tx: WriteTransaction, data: {[key: string]: JSONValue}) {
for (const [key, value] of Object.entries(data)) {
await tx.put(key, value);
}
}
function resolver(): {resolve: () => void; promise: Promise<void>} {
let res: () => void;
const promise = new Promise<void>(r => {
res = r;
});
return {
resolve: () => res(),
promise,
};
}
const emptyHash = '00000000000000000000000000000000';
beforeEach(async () => {
if (testMode !== 'replay') {
const dbs = await ReplicacheTest.list({repmInvoke: httpInvoke});
for (const info of dbs) {
await ReplicacheTest.drop(info.name, {repmInvoke: httpInvoke});
}
}
});
afterEach(async () => {
// _closeTransaction is async but we do not wait for it which can lead to
// us closing the db before the tx is done. For the tests we do not want
// these errors.
await delay(300);
if (rep !== null && !rep.closed) {
await rep.close();
rep = null;
}
if (rep2 !== null && !rep2.closed) {
await rep2.close();
rep2 = null;
}
if (testMode === 'record') {
if (!fixtureFile) fail();
await fixtureFile.writeFile(JSON.stringify(replays, null, 2), 'utf-8');
}
replays = [];
if (fixtureFile) {
await fixtureFile.close();
fixtureFile = undefined;
}
expect(resultReplacements).toHaveLength(0);
});
test('list and drop', async () => {
await useReplay('list and drop');
rep = await replicacheForTesting('def');
rep2 = await replicacheForTesting('abc');
const dbs = await ReplicacheTest.list({repmInvoke: invoke});
expect(dbs).toEqual([{name: 'abc'}, {name: 'def'}]);
{
await ReplicacheTest.drop('abc', {repmInvoke: invoke});
const dbs = await ReplicacheTest.list({repmInvoke: invoke});
expect(dbs).toEqual([{name: 'def'}]);
}
});
test('get, has, scan on empty db', async () => {
await useReplay('get, has, scan on empty db');
rep = await replicacheForTesting('test2');
async function t(tx: ReadTransaction) {
expect(await tx.get('key')).toBeUndefined();
expect(await tx.has('key')).toBe(false);
const scanItems = await tx.scan();
expect(scanItems).toHaveLength(0);
}
await t(rep);
await rep.query(t);
});
test('put, get, has, del inside tx', async () => {
await useReplay('put, get, has, del inside tx');
rep = await replicacheForTesting('test3');
const mut = rep.register(
'mut',
async (tx: WriteTransaction, args: {key: string; value: JSONValue}) => {
const key = args['key'];
const value = args['value'];
await tx.put(key, value);
expect(await tx.has(key)).toBe(true);
const v = await tx.get(key);
expect(v).toEqual(value);
expect(await tx.del(key)).toBe(true);
expect(await tx.has(key)).toBe(false);
},
);
for (const [key, value] of Object.entries({
a: true,
b: false,
c: null,
d: 'string',
e: 12,
f: {},
g: [],
h: {h1: true},
i: [0, 1],
})) {
await mut({key, value});
}
});
test('scan', async () => {
await useReplay('scan');
rep = await replicacheForTesting('test4');
const add = rep.register('add-data', addData);
await add({
'a/0': 0,
'a/1': 1,
'a/2': 2,
'a/3': 3,
'a/4': 4,
'b/0': 5,
'b/1': 6,
'b/2': 7,
'c/0': 8,
});
expect(await rep.scan()).toEqual([
{key: 'a/0', value: 0},
{key: 'a/1', value: 1},
{key: 'a/2', value: 2},
{key: 'a/3', value: 3},
{key: 'a/4', value: 4},
{key: 'b/0', value: 5},
{key: 'b/1', value: 6},
{key: 'b/2', value: 7},
{key: 'c/0', value: 8},
]);
expect(await rep?.scan({prefix: 'a'})).toEqual([
{key: 'a/0', value: 0},
{key: 'a/1', value: 1},
{key: 'a/2', value: 2},
{key: 'a/3', value: 3},
{key: 'a/4', value: 4},
]);
expect(await rep?.scan({prefix: 'b'})).toEqual([
{key: 'b/0', value: 5},
{key: 'b/1', value: 6},
{key: 'b/2', value: 7},
]);
expect(await rep?.scan({prefix: 'c/'})).toEqual([{key: 'c/0', value: 8}]);
expect(await rep?.scan({limit: 3})).toEqual([
{key: 'a/0', value: 0},
{key: 'a/1', value: 1},
{key: 'a/2', value: 2},
]);
expect(
await rep?.scan({
start: {id: {value: 'a/1', exclusive: false}},
limit: 2,
}),
).toEqual([
{key: 'a/1', value: 1},
{key: 'a/2', value: 2},
]);
expect(
await rep?.scan({
start: {id: {value: 'a/1', exclusive: true}},
limit: 2,
}),
).toEqual([
{key: 'a/2', value: 2},
{key: 'a/3', value: 3},
]);
expect(
await rep?.scan({
start: {id: {exclusive: false}, index: 1},
limit: 2,
}),
).toEqual([
{key: 'a/1', value: 1},
{key: 'a/2', value: 2},
]);
});
function listen<R>(
s: {getReader: ReadableStream['getReader']},
callback: (r: R) => void,
) {
let cancelled = false;
let paused = false;
// eslint-disable-next-line @typescript-eslint/no-empty-function
let onDone = () => {};
// eslint-disable-next-line @typescript-eslint/no-empty-function
let onError: (e: unknown) => void = () => {};
async function inner<R>(
s: {getReader: ReadableStream['getReader']},
callback: (r: R) => void,
) {
const reader = s.getReader();
try {
for (;;) {
const res = await reader.read();
if (cancelled || res.done) {
return;
}
if (!paused) {
callback(res.value);
}
}
} catch (e) {
onError(e);
} finally {
reader.releaseLock();
onDone();
}
}
inner(s, callback);
return {
cancel() {
cancelled = true;
},
pause() {
paused = true;
},
resume() {
paused = false;
},
onDone(f: () => void) {
onDone = f;
},
onError(f: (e: unknown) => void) {
onError = f;
},
};
}
test('subscribe', async () => {
await useReplay('subscribe');
rep = await replicacheForTesting('subscribe');
const repSub = rep.subscribe(
async (tx: ReadTransaction) => await tx.scan({prefix: 'a/'}),
);
const log: ScanItem[] = [];
const sub = listen(repSub, (values: Iterable<ScanItem>) => {
for (const scanItem of values) {
log.push(scanItem);
}
});
expect(log).toHaveLength(0);
const add = rep.register('add-data', addData);
await add({'a/0': 0});
await Promise.resolve();
expect(log).toEqual([{key: 'a/0', value: 0}]);
// We might potentially remove this entry if we start checking equality.
log.length = 0;
await add({'a/0': 0});
await Promise.resolve();
expect(log).toEqual([{key: 'a/0', value: 0}]);
log.length = 0;
await add({'a/1': 1});
await Promise.resolve();
expect(log).toEqual([
{key: 'a/0', value: 0},
{key: 'a/1', value: 1},
]);
log.length = 0;
sub.pause();
await add({'a/1': 1});
await Promise.resolve();
expect(log).toHaveLength(0);
log.length = 0;
sub.resume();
await add({'a/1': 11});
await Promise.resolve();
expect(log).toEqual([
{key: 'a/0', value: 0},
{key: 'a/1', value: 11},
]);
log.length = 0;
sub.cancel();
await add({'a/1': 11});
await Promise.resolve();
expect(log).toHaveLength(0);
});
test('subscribe close', async () => {
await useReplay('subscribe close');
rep = await replicacheForTesting('subscribe-close');
const repSub = rep.subscribe((tx: ReadTransaction) => tx.get('k'));
const log: (number | undefined)[] = [];
const sub = listen(repSub, (value: number | undefined) => {
log.push(value);
});
expect(log).toHaveLength(0);
const add = rep.register('add-data', addData);
await add({k: 0});
await Promise.resolve();
expect(log).toEqual([undefined, 0]);
let done = false;
sub.onDone(() => {
done = true;
});
await rep.close();
expect(done).toBe(true);
sub.cancel();
});
test('name', async () => {
await useReplay('name');
const repA = await replicacheForTesting('a');
const repB = await replicacheForTesting('b');
const addA = repA.register('add-data', addData);
const addB = repB.register('add-data', addData);
await addA({key: 'A'});
await addB({key: 'B'});
expect(await repA.get('key')).toBe('A');
expect(await repB.get('key')).toBe('B');
await repA.close();
await repB.close();
});
test('register with error', async () => {
await useReplay('register with error');
rep = await replicacheForTesting('regerr');
const doErr = rep.register('err', async (_, args) => {
throw args;
});
try {
await doErr(42);
fail('Should have thrown');
} catch (ex) {
expect(ex).toBe(42);
}
});
test('subscribe with error', async () => {
await useReplay('subscribe with error');
rep = await replicacheForTesting('suberr');
const add = rep.register('add-data', addData);
const repSub = rep.subscribe(async tx => {
const v = await tx.get('k');
if (v !== undefined && v !== null) {
throw v;
}
});
await Promise.resolve();
let gottenValue = 0;
const sub = listen(repSub, () => {
gottenValue++;
});
let error;
sub.onError(e => {
error = e;
});
expect(error).toBeUndefined();
expect(gottenValue).toBe(0);
await add({k: 'throw'});
expect(gottenValue).toBe(1);
await Promise.resolve();
expect(error).toBe('throw');
await sub.cancel();
});
test('conflicting commits', async () => {
await useReplay('conflicting commits');
// This test does not use pure functions in the mutations. This is of course
// not a good practice but it makes testing easier.
const ar = resolver();
const br = resolver();
rep = await replicacheForTesting('conflict');
const mutA = rep.register('mutA', async (tx, v) => {
await tx.put('k', v);
await ar.promise;
});
const mutB = rep.register('mutB', async (tx, v) => {
await tx.put('k', v);
await br.promise;
});
// Start A and B at the same commit.
const resAFuture = mutA('a');
const resBFuture = mutB('b');
// Finish A.
ar.resolve();
await resAFuture;
expect(await rep.get('k')).toBe('a');
// Finish B. B will conflict and retry!
br.resolve();
await resBFuture;
expect(await rep.get('k')).toBe('b');
});
test('sync', async () => {
await useReplay('sync');
rep = await replicacheForTesting('sync', {
batchURL: 'https://replicache-sample-todo.now.sh/serve/replicache-batch',
dataLayerAuth: '1',
diffServerAuth: '1',
});
const c = resolver();
c.resolve();
let createCount = 0;
let deleteCount = 0;
let syncHead: string;
let beginSyncResult: {
syncID: string;
syncHead: string;
};
const createTodo = rep.register(
'createTodo',
async <A extends {id: number}>(tx: WriteTransaction, args: A) => {
createCount++;
await tx.put(`/todo/${args.id}`, args);
},
);
const deleteTodo = rep.register(
'deleteTodo',
async <A extends {id: number}>(tx: WriteTransaction, args: A) => {
deleteCount++;
await tx.del(`/todo/${args.id}`);
},
);
const id1 = 14323534;
const id2 = 22354345;
await deleteTodo({id: id1});
await deleteTodo({id: id2});
expect(deleteCount).toBe(2);
await rep?.sync();
expect(deleteCount).toBe(2);
beginSyncResult = await rep?.beginSync();
syncHead = beginSyncResult.syncHead;
expect(syncHead).toBe(emptyHash);
expect(deleteCount).toBe(2);
await createTodo({
id: id1,
listId: 1,
text: 'Test',
complete: false,
order: 10000,
});
expect(createCount).toBe(1);
expect(((await rep?.get(`/todo/${id1}`)) as {text: string}).text).toBe(
'Test',
);
beginSyncResult = await rep?.beginSync();
syncHead = beginSyncResult.syncHead;
expect(syncHead).not.toBe(emptyHash);
await createTodo({
id: id2,
listId: 1,
text: 'Test 2',
complete: false,
order: 20000,
});
expect(createCount).toBe(2);
expect(((await rep?.get(`/todo/${id2}`)) as {text: string}).text).toBe(
'Test 2',
);
await rep?.maybeEndSync(beginSyncResult);
expect(createCount).toBe(3);
// Clean up
await deleteTodo({id: id1});
await deleteTodo({id: id2});
expect(deleteCount).toBe(4);
expect(createCount).toBe(3);
await rep?.sync();
expect(deleteCount).toBe(4);
expect(createCount).toBe(3);
});
test('reauth', async () => {
await useReplay('reauth');
addResultReplacement(({method}) => method === 'beginSync', {
syncHead: '62f6ki43l12mujhubcfhjuugiause17b',
syncInfo: {
syncID: 'XY6WhbbdeUdytMJNtsBejG-5ed87fed-1',
clientViewInfo: {
httpStatusCode: httpStatusUnauthorized,
errorMessage: 'xxx',
},
},
} as BeginSyncResponse);
rep = await replicacheForTesting('reauth');
rep.getDataLayerAuth = jest.fn(() => {
return null;
});
await rep.beginSync();
expect(rep.getDataLayerAuth).toBeCalledTimes(1);
});