http-party

Similar in scope to level-party but for http. Allows you to run multiple http servers that share a port file and does automatic failover if the server listening on the port crashes.

npm install http-party

Usage

var party = require('http-party');
 
party('./PORT', // './PORT' is the port file the servers will use to coordinate.
  function onserver(server) {
    server.on('request', function(request, response) {
      response.end('hello world from '+pid);
    })
  },
  function ready(err, port) {
    console.log('Someone is listening on', port);
  }
);

The PORT file defaults to ./PORT. Try running the above example in a folder and spawn multiple processes.

cd some-dir
node example.js &
node example.js &
node example.js &
node example.js &
node example.js

The processes should print the same port. Try curling to that port

curl http://127.0.0.1:PORT

This should print the pid of a process. Try killing that process.

kill PID

If you curl the same url again one of the other processes will be listening instead! You can always cat the PORT file to figure out which port is being used. Also since we use a regular file instead of unix sockets this should also work on windows!

If you already have a server just pass than instead of the onserver function

var server = http.createServer(function(req, res) {
  res.end('hello world\n')
})
 
server.on('listening', function() {
  console.log('Server has started')
})
 
party('./PORT', server, function(err, port) {
  console.log('Someone is listening on', port);
})

License

MIT