Server module for SocketCluster
npm install socketcluster-serverThis is a stand-alone server module for SocketCluster.
SocketCluster's protocol is backwards compatible with the SocketCluster protocol.
You will need to install both ``socketcluster-server` and `socketcluster-client` (https://github.com/SocketCluster/socketcluster-client).
To install this module:
`bash`
npm install socketcluster-server
You need to attach it to an existing Node.js http or https server (example):
`js
const http = require('http');
const socketClusterServer = require('socketcluster-server');
let httpServer = http.createServer();
let agServer = socketClusterServer.attach(httpServer);
(async () => {
// Handle new inbound sockets.
for await (let {socket} of agServer.listener('connection')) {
(async () => {
// Set up a loop to handle and respond to RPCs for a procedure.
for await (let req of socket.procedure('customProc')) {
if (!req.data) {
let error = new Error('Server failed to execute the procedure');
error.name = 'BadCustomError';
req.error(error);
} else {
req.end('Success');
}
}
})();
(async () => {
// Set up a loop to handle remote transmitted events.
for await (let data of socket.receiver('customRemoteEvent')) {
// ...
}
})();
}
})();
httpServer.listen(8000);
`
For more detailed examples of how to use SocketCluster, see test/integration.js.socketcluster-client
Also, see tests from the module.
SocketCluster can work without the for-await-of loop; a while loop with await statements can be used instead.
See https://github.com/SocketCluster/stream-demux#usage
For compatibility with existing SocketCluster clients, set the protocolVersion to 1 and make sure that the path matches your old client path:
`js`
let agServer = socketClusterServer.attach(httpServer, {
protocolVersion: 1,
path: '/socketcluster/'
});
- Clone this repo: git clone git@github.com:SocketCluster/socketcluster-server.git
- Navigate to project directory:
- Install all dependencies:
- Run the tests:
over EventEmitter- More readable: Code is written sequentially from top to bottom. It avoids event handler callback hell. It's also much easier to write and read complex integration test scenarios.
- More succinct: Event streams can be easily chained, filtered and combined using a declarative syntax (e.g. using async generators).
- More manageable: No need to remember to unbind listeners with removeListener(...); just break out of the for-await-of loop to stop consuming. This also encourages a more declarative style of coding which reduces the likelihood of memory leaks and unintended side effects.EventEmitter`, the listener function for the same event cannot be prevented from running multiple times in parallel; also, asynchronous calls within middleware and listeners can affect the final order of actions; all this can cause unintended side effects.
- Less error-prone: Each event/RPC/message can be processed sequentially in the same order that they were sent without missing any data; even if asynchronous calls are made inside middleware or listeners. On the other hand, with
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