131 lines
2.3 KiB
Markdown
131 lines
2.3 KiB
Markdown
# Limiter
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A promise pool with RPS limiter.
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Features:
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- [x] TypeScript first
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- [x] Limits parrallel promises execution
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- [x] Limits RPS (requests per second), evenly distributes the requests over time
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- [x] Able to retry
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- [x] Simple API
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- [x] Simple async/await flow
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- [x] Allows to handle errors silently using onError callback
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- [x] Works with any runtime (Bun/Deno/Node)
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## Install
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```bash
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bun add github:nesterow/limiter # or pnpm
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```
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## Usage
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### Add tasks
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```typescript
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import { Limiter, LimiterRetryError } from "@nesterow/limiter";
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const task = ({ url }) => {
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await fetch(url);
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// ... write
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};
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const limiter = new Limiter({
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limit: 20,
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onError(error) {
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// Logger.error(error)
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},
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});
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limiter.process(task);
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limiter.process(task);
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limiter.process(task);
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```
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### Limit number of requests
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```typescript
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import { Limiter } from "@nesterow/limiter";
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const task = () => {
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await fetch("https://my.api.xyz");
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// ... write
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};
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const limiter = new Limiter({
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limit: 10,
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});
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await limiter.process(...Array.from({ length: 100 }, () => task()));
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```
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### Limit RPS
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```typescript
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import { Limiter } from "@nesterow/limiter";
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const execEvery100ms = () => {
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await fetch("https://my.api.xyz");
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// ... write
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};
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const limiter = new Limiter({
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limit: 20,
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rps: 10,
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});
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await limiter.process(...Array.from({ length: 100 }, () => execEvery100ms()));
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```
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### Retry
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```typescript
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import { Limiter, LimiterRetryError } from "@nesterow/limiter";
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const retry5times = () => {
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await fetch("https://my.api.xyz");
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throw new Error("Connection refused");
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// ... write
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};
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const limiter = new Limiter({
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limit: 20,
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maxRetry: 5,
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});
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for (let i = 0; i < 100; i++) {
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try {
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await limiter.process(Array.from({ length: 100 }, () => retry5times()));
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} catch (e) {
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if (e instanceof LimiterRetryError) {
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// Logger.log(e)
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}
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}
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}
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```
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### Handle errors in background
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```typescript
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import { Limiter, LimiterRetryError } from "@nesterow/limiter";
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const wontStopPooling = () => {
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await fetch("https://my.api.xyz");
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throw new Error("Connection refused");
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// ... write
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};
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const limiter = new Limiter({
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limit: 20,
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maxRetry: 5,
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onError(error) {
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// Logger.error(error)
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},
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});
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for (let i = 0; i < 100; i++) {
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await limiter.process(Array.from({ length: 100 }, () => wontStopPooling()));
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}
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```
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