158 lines
4.4 KiB
Markdown
158 lines
4.4 KiB
Markdown
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# engine.io-parser
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[](https://github.com/socketio/engine.io-parser/actions)
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[](https://npmjs.com/package/engine.io-parser)
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This is the JavaScript parser for the engine.io protocol encoding,
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shared by both
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[engine.io-client](https://github.com/socketio/engine.io-client) and
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[engine.io](https://github.com/socketio/engine.io).
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## How to use
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### Standalone
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The parser can encode/decode packets, payloads, and payloads as binary
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with the following methods: `encodePacket`, `decodePacket`, `encodePayload`,
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`decodePayload`.
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Example:
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```js
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const parser = require("engine.io-parser");
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const data = Buffer.from([ 1, 2, 3, 4 ]);
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parser.encodePacket({ type: "message", data }, encoded => {
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const decodedData = parser.decodePacket(encoded); // decodedData === data
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});
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```
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### With browserify
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Engine.IO Parser is a commonjs module, which means you can include it by using
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`require` on the browser and package using [browserify](http://browserify.org/):
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1. install the parser package
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```shell
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npm install engine.io-parser
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```
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1. write your app code
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```js
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const parser = require("engine.io-parser");
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const testBuffer = new Int8Array(10);
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for (let i = 0; i < testBuffer.length; i++) testBuffer[i] = i;
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const packets = [{ type: "message", data: testBuffer.buffer }, { type: "message", data: "hello" }];
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parser.encodePayload(packets, encoded => {
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parser.decodePayload(encoded,
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(packet, index, total) => {
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const isLast = index + 1 == total;
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if (!isLast) {
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const buffer = new Int8Array(packet.data); // testBuffer
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} else {
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const message = packet.data; // "hello"
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}
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});
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});
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```
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1. build your app bundle
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```bash
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$ browserify app.js > bundle.js
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```
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1. include on your page
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```html
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<script src="/path/to/bundle.js"></script>
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```
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## Features
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- Runs on browser and node.js seamlessly
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- Runs inside HTML5 WebWorker
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- Can encode and decode packets
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- Encodes from/to ArrayBuffer or Blob when in browser, and Buffer or ArrayBuffer in Node
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## API
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Note: `cb(type)` means the type is a callback function that contains a parameter of type `type` when called.
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### Node
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- `encodePacket`
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- Encodes a packet.
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- **Parameters**
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- `Object`: the packet to encode, has `type` and `data`.
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- `data`: can be a `String`, `Number`, `Buffer`, `ArrayBuffer`
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- `Boolean`: binary support
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- `Function`: callback, returns the encoded packet (`cb(String)`)
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- `decodePacket`
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- Decodes a packet. Data also available as an ArrayBuffer if requested.
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- Returns data as `String` or (`Blob` on browser, `ArrayBuffer` on Node)
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- **Parameters**
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- `String` | `ArrayBuffer`: the packet to decode, has `type` and `data`
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- `String`: optional, the binary type
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- `encodePayload`
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- Encodes multiple messages (payload).
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- If any contents are binary, they will be encoded as base64 strings. Base64
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encoded strings are marked with a b before the length specifier
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- **Parameters**
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- `Array`: an array of packets
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- `Function`: callback, returns the encoded payload (`cb(String)`)
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- `decodePayload`
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- Decodes data when a payload is maybe expected. Possible binary contents are
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decoded from their base64 representation.
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- **Parameters**
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- `String`: the payload
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- `Function`: callback, returns (cb(`Object`: packet, `Number`:packet index, `Number`:packet total))
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## Tests
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Standalone tests can be run with `npm test` which will run the node.js tests.
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Browser tests are run using [zuul](https://github.com/defunctzombie/zuul).
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(You must have zuul setup with a saucelabs account.)
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You can run the tests locally using the following command:
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```
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npm run test:browser
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```
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## Support
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The support channels for `engine.io-parser` are the same as `socket.io`:
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- irc.freenode.net **#socket.io**
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- [Github Discussions](https://github.com/socketio/socket.io/discussions)
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- [Website](https://socket.io)
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## Development
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To contribute patches, run tests or benchmarks, make sure to clone the
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repository:
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```bash
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git clone git://github.com/socketio/engine.io-parser.git
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```
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Then:
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```bash
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cd engine.io-parser
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npm ci
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```
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See the `Tests` section above for how to run tests before submitting any patches.
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## License
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MIT
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