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This commit is contained in:
Anton Nesterov 2024-07-11 01:20:10 +02:00
parent a6c579e429
commit 6884386903
6 changed files with 277 additions and 268 deletions
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17
README.md
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@ -24,21 +24,20 @@ bun add github:nesterow/limiter # or pnpm
### Limit number of requests ### Limit number of requests
```typescript ```typescript
import {Limiter} from '@nesterow/limiter' import { Limiter } from "@nesterow/limiter";
const task = () => { const task = () => {
await fetch('https://my.api.xyz') await fetch("https://my.api.xyz");
// ... write // ... write
} };
const limiter = new Limiter({ const limiter = new Limiter({
limit: 10 limit: 10,
}) });
for (let i=0; i<100; i++) { for (let i = 0; i < 100; i++) {
await limiter.process(task) await limiter.process(task);
} }
``` ```
### Limit RPS ### Limit RPS

204
dist/limiter.js vendored
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@ -1,117 +1,111 @@
export class LimiterRetryError extends Error { export class LimiterRetryError extends Error {
constructor(message, error) { constructor(message, error) {
super(message); super(message);
this.name = "RetryError"; this.name = "RetryError";
if (error) { if (error) {
this.stack = error.stack; this.stack = error.stack;
this.cause = error; this.cause = error;
}
} }
}
} }
export class Limiter { export class Limiter {
#limit = 10; #limit = 10;
#promisesCount = 0; #promisesCount = 0;
#promises = []; #promises = [];
#retryQueue = []; #retryQueue = [];
#maxRetry = 0; #maxRetry = 0;
#rps; #rps;
#onError; #onError;
constructor({ limit = 10, rps, maxRetry = 0, onError = undefined, }) { constructor({ limit = 10, rps, maxRetry = 0, onError = undefined }) {
this.#limit = limit; this.#limit = limit;
this.#rps = rps; this.#rps = rps;
this.#maxRetry = maxRetry; this.#maxRetry = maxRetry;
this.#onError = onError?.bind(this); this.#onError = onError?.bind(this);
}
#tick = Date.now();
async #limitRps(callback, delay = 0) {
if (!this.#rps) {
return await callback();
} }
#tick = Date.now(); if (delay > 0) {
async #limitRps(callback, delay = 0) { await new Promise((resolve) => setTimeout(resolve, delay));
if (!this.#rps) {
return await callback();
}
if (delay > 0) {
await new Promise((resolve) => setTimeout(resolve, delay));
}
const diff = Date.now() - this.#tick;
if (diff < 1000 / this.#rps) {
return await this.#limitRps(callback, 1000 / this.#rps - diff);
}
this.#tick = Date.now();
return await callback();
} }
async #execute() { const diff = Date.now() - this.#tick;
if (diff < 1000 / this.#rps) {
return await this.#limitRps(callback, 1000 / this.#rps - diff);
}
this.#tick = Date.now();
return await callback();
}
async #execute() {
try {
await Promise.all(this.#promises);
this.#promises = [];
} catch (error) {
if (!this.#onError) {
throw error;
}
for (;;) {
const promise = this.#promises.pop();
if (!promise) break;
promise.catch(this.#onError);
}
}
}
async process(...callbacks) {
for (;;) {
const item = callbacks.pop();
if (!item) break;
if (this.#promisesCount >= this.#limit) {
await this.#execute();
}
this.#promisesCount++;
const promise = (async (item) => {
const callback = item.callback || item;
try { try {
await Promise.all(this.#promises); const res = await this.#limitRps(callback);
this.#promises = []; this.#promisesCount--;
} return res;
catch (error) { } catch (error) {
if (!this.#onError) { this.#promisesCount--;
throw error; if (this.#maxRetry > 0) {
} this.#retryQueue.push({
for (;;) { callback,
const promise = this.#promises.pop(); retries: item.retries ?? this.#maxRetry,
if (!promise) error: error,
break; });
promise.catch(this.#onError); } else {
} throw error;
}
} }
})(item);
this.#promises.push(promise);
} }
async process(...callbacks) { if (this.#promises.length > 0) {
for (;;) { await this.#execute();
const item = callbacks.pop();
if (!item)
break;
if (this.#promisesCount >= this.#limit) {
await this.#execute();
}
this.#promisesCount++;
const promise = (async (item) => {
const callback = item.callback || item;
try {
const res = await this.#limitRps(callback);
this.#promisesCount--;
return res;
}
catch (error) {
this.#promisesCount--;
if (this.#maxRetry > 0) {
this.#retryQueue.push({
callback,
retries: item.retries ?? this.#maxRetry,
error: error,
});
}
else {
throw error;
}
}
})(item);
this.#promises.push(promise);
}
if (this.#promises.length > 0) {
await this.#execute();
}
if (this.#retryQueue.length > 0) {
const retryItems = [];
for (;;) {
const item = this.#retryQueue.pop();
if (!item)
break;
if (item.retries > 0) {
item.retries--;
retryItems.push(item);
}
else if (this.#onError) {
this.#onError(new LimiterRetryError("Retry limit exceeded", item.error));
}
else {
throw new LimiterRetryError("Retry limit exceeded", item.error);
}
}
if (retryItems.length) {
await this.process(...retryItems);
}
}
} }
get length() { if (this.#retryQueue.length > 0) {
return this.#promisesCount; const retryItems = [];
for (;;) {
const item = this.#retryQueue.pop();
if (!item) break;
if (item.retries > 0) {
item.retries--;
retryItems.push(item);
} else if (this.#onError) {
this.#onError(
new LimiterRetryError("Retry limit exceeded", item.error),
);
} else {
throw new LimiterRetryError("Retry limit exceeded", item.error);
}
}
if (retryItems.length) {
await this.process(...retryItems);
}
} }
}
get length() {
return this.#promisesCount;
}
} }

316
dist/limiter.test.js vendored
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@ -2,172 +2,182 @@ import { beforeAll, expect, test, jest } from "bun:test";
import { Limiter, LimiterRetryError } from "./limiter"; import { Limiter, LimiterRetryError } from "./limiter";
const delay = (ms) => new Promise((r) => setTimeout(r, ms)); const delay = (ms) => new Promise((r) => setTimeout(r, ms));
const setup = ({ send, close, delay = 300 }) => { const setup = ({ send, close, delay = 300 }) => {
return jest.fn(() => { return jest.fn(() => {
let closed = false; let closed = false;
let loading = false; let loading = false;
return { return {
process: jest.fn(async () => { process: jest.fn(async () => {
if (closed) if (closed) throw new Error("Connection closed");
throw new Error("Connection closed"); //if (loading) throw new Error("Connection in use");
//if (loading) throw new Error("Connection in use"); loading = true;
loading = true; await send();
await send(); await new Promise((resolve) => setTimeout(resolve, delay));
await new Promise((resolve) => setTimeout(resolve, delay)); loading = false;
loading = false; }),
}), close: jest.fn(async () => {
close: jest.fn(async () => { close();
close(); closed = true;
closed = true; }),
}), send,
send, };
}; });
});
}; };
test("Limiter: opens #limit of concurent connections", async () => { test("Limiter: opens #limit of concurent connections", async () => {
const connection = setup({ const connection = setup({
send: jest.fn(() => Promise.resolve()), send: jest.fn(() => Promise.resolve()),
close: jest.fn(() => Promise.resolve()), close: jest.fn(() => Promise.resolve()),
delay: 500, delay: 500,
}); });
const limiter = new Limiter({ limit: 3 }); const limiter = new Limiter({ limit: 3 });
const connections = Array.from({ length: 7 }, () => connection()); const connections = Array.from({ length: 7 }, () => connection());
limiter.process(...connections.map((c) => { limiter.process(
return c.process; ...connections.map((c) => {
})); return c.process;
await delay(0); }),
expect(limiter.length).toBe(3); );
await delay(500); await delay(0);
expect(limiter.length).toBe(3); expect(limiter.length).toBe(3);
await delay(500); await delay(500);
expect(limiter.length).toBe(1); expect(limiter.length).toBe(3);
expect(connections[0].send).toBeCalledTimes(7); await delay(500);
expect(limiter.length).toBe(1);
expect(connections[0].send).toBeCalledTimes(7);
}); });
test("Limiter: can add new connections to poll", async () => { test("Limiter: can add new connections to poll", async () => {
const connection = setup({ const connection = setup({
send: jest.fn(() => Promise.resolve()), send: jest.fn(() => Promise.resolve()),
close: jest.fn(() => Promise.resolve()), close: jest.fn(() => Promise.resolve()),
delay: 500, delay: 500,
}); });
const limiter = new Limiter({ limit: 3 }); const limiter = new Limiter({ limit: 3 });
limiter.process(connection().process); limiter.process(connection().process);
limiter.process(connection().process); limiter.process(connection().process);
limiter.process(connection().process); limiter.process(connection().process);
limiter.process(connection().process, connection().process); limiter.process(connection().process, connection().process);
await delay(0); await delay(0);
expect(limiter.length).toBe(3); expect(limiter.length).toBe(3);
await delay(500); await delay(500);
expect(limiter.length).toBe(2); expect(limiter.length).toBe(2);
await delay(500); await delay(500);
expect(limiter.length).toBe(0); expect(limiter.length).toBe(0);
}); });
test("Limiter: limit RPS - requests are evenly distributed", async () => { test("Limiter: limit RPS - requests are evenly distributed", async () => {
const connection = setup({ const connection = setup({
send: jest.fn(() => { send: jest.fn(() => {
return Promise.resolve(); return Promise.resolve();
}), }),
close: jest.fn(() => Promise.resolve()), close: jest.fn(() => Promise.resolve()),
delay: 0, delay: 0,
}); });
const limiter = new Limiter({ limit: 20, rps: 10 }); const limiter = new Limiter({ limit: 20, rps: 10 });
const connections = Array.from({ length: 45 }, () => connection()); const connections = Array.from({ length: 45 }, () => connection());
let count = 0; let count = 0;
const timestamps = []; const timestamps = [];
await limiter.process(...connections.map((c) => { await limiter.process(
return () => { ...connections.map((c) => {
++count; return () => {
timestamps.push(Date.now()); ++count;
return c.process(); timestamps.push(Date.now());
}; return c.process();
})); };
expect(count).toBe(45); }),
const diffsAvg = timestamps );
.map((t, i) => { expect(count).toBe(45);
const diffsAvg =
timestamps
.map((t, i) => {
return i === 0 ? 100 : t - timestamps[i - 1]; return i === 0 ? 100 : t - timestamps[i - 1];
}) })
.reduce((a, b) => a + b) / timestamps.length; .reduce((a, b) => a + b) / timestamps.length;
expect(diffsAvg).toBeGreaterThan(99); expect(diffsAvg).toBeGreaterThan(99);
expect(diffsAvg).toBeLessThan(102); // 100ms +- 2ms expect(diffsAvg).toBeLessThan(102); // 100ms +- 2ms
}); });
test("Limiter: throws an error by deafult", async () => { test("Limiter: throws an error by deafult", async () => {
const connection = setup({ const connection = setup({
send: jest.fn(() => Promise.reject(1)), send: jest.fn(() => Promise.reject(1)),
close: jest.fn(() => Promise.resolve()), close: jest.fn(() => Promise.resolve()),
delay: 500, delay: 500,
}); });
const limiter = new Limiter({ limit: 3 }); const limiter = new Limiter({ limit: 3 });
const connections = Array.from({ length: 6 }, () => connection()); const connections = Array.from({ length: 6 }, () => connection());
try { try {
await limiter.process(...connections.map((c) => { await limiter.process(
return c.process; ...connections.map((c) => {
})); return c.process;
} }),
catch (e) { );
expect(e).toBe(1); } catch (e) {
} expect(e).toBe(1);
expect(limiter.length).toBe(0); }
expect(connections[0].send).toBeCalledTimes(3); expect(limiter.length).toBe(0);
expect(connections[0].send).toBeCalledTimes(3);
}); });
test("Limiter: #onError, no trow", async () => { test("Limiter: #onError, no trow", async () => {
const connection = setup({ const connection = setup({
send: jest.fn(() => Promise.reject(1)), send: jest.fn(() => Promise.reject(1)),
close: jest.fn(() => Promise.resolve()), close: jest.fn(() => Promise.resolve()),
delay: 500, delay: 500,
}); });
const onError = jest.fn(() => { }); const onError = jest.fn(() => {});
const limiter = new Limiter({ const limiter = new Limiter({
limit: 3, limit: 3,
onError, onError,
}); });
const connections = Array.from({ length: 6 }, () => connection()); const connections = Array.from({ length: 6 }, () => connection());
await limiter.process(...connections.map((c) => { await limiter.process(
return c.process; ...connections.map((c) => {
})); return c.process;
expect(limiter.length).toBe(0); }),
expect(connections[0].send).toBeCalledTimes(6); );
expect(onError).toBeCalledTimes(6); expect(limiter.length).toBe(0);
expect(connections[0].send).toBeCalledTimes(6);
expect(onError).toBeCalledTimes(6);
}); });
test("Limiter: #maxRetry, exit on fail", async () => { test("Limiter: #maxRetry, exit on fail", async () => {
const connection = setup({ const connection = setup({
send: () => Promise.reject(1), send: () => Promise.reject(1),
close: jest.fn(() => Promise.resolve()), close: jest.fn(() => Promise.resolve()),
delay: 0, delay: 0,
}); });
const limiter = new Limiter({ const limiter = new Limiter({
limit: 3, limit: 3,
maxRetry: 3, maxRetry: 3,
}); });
const connections = Array.from({ length: 6 }, () => connection()); const connections = Array.from({ length: 6 }, () => connection());
let count = 0; let count = 0;
try { try {
await limiter.process(...connections.map((c) => { await limiter.process(
++count; ...connections.map((c) => {
return c.process; ++count;
})); return c.process;
} }),
catch (e) { );
expect(e).toBeInstanceOf(LimiterRetryError); } catch (e) {
} expect(e).toBeInstanceOf(LimiterRetryError);
expect(limiter.length).toBe(0); }
expect(limiter.length).toBe(0);
}); });
test("Limiter: #onError, #maxRetry", async () => { test("Limiter: #onError, #maxRetry", async () => {
const connection = setup({ const connection = setup({
send: jest.fn(() => Promise.reject(new Error("Connection error"))), send: jest.fn(() => Promise.reject(new Error("Connection error"))),
close: jest.fn(() => Promise.resolve()), close: jest.fn(() => Promise.resolve()),
delay: 0, delay: 0,
}); });
let error; let error;
const onError = jest.fn((err) => { const onError = jest.fn((err) => {
error = err; error = err;
}); });
const limiter = new Limiter({ const limiter = new Limiter({
limit: 3, limit: 3,
maxRetry: 3, maxRetry: 3,
onError, onError,
}); });
const connections = Array.from({ length: 6 }, () => connection()); const connections = Array.from({ length: 6 }, () => connection());
await limiter.process(...connections.map((c) => { await limiter.process(
return c.process; ...connections.map((c) => {
})); return c.process;
expect(onError).toBeCalledTimes(6); }),
expect(error).toBeInstanceOf(LimiterRetryError); );
expect(onError).toBeCalledTimes(6);
expect(error).toBeInstanceOf(LimiterRetryError);
}); });

5
jsr.json Normal file
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@ -0,0 +1,5 @@
{
"name": "@nesterow/limiter",
"version": "0.1.0",
"exports": "./limiter.ts"
}

2
limiter.ts
View file

@ -140,7 +140,7 @@ export class Limiter implements ILimiter {
} }
} }
get length() { get length(): number {
return this.#promisesCount; return this.#promisesCount;
} }
} }

1
package.json
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@ -1,4 +1,5 @@
{ {
"version": "0.1.0",
"name": "@nesterow/limiter", "name": "@nesterow/limiter",
"module": "limiter.ts", "module": "limiter.ts",
"type": "module", "type": "module",