zerorpc/lib/middleware.js

A port of ZeroRPC to node.js

// Open Source Initiative OSI - The MIT License (MIT):Licensing
//
// The MIT License (MIT)
// Copyright (c) 2015 François-Xavier Bourlet (bombela+zerorpc@gmail.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

var util = require("./util");

//Adds a timeout on a channel - if a response isn't received within a certain
//amount of time, we execute the callback with a timeout error.
function addTimeout(timeout, channel, callback) {
    var runner = setTimeout(function() {
        var error = util.createErrorResponse("TimeoutExpired", "Timeout after " + timeout + "ms");
        callback(error);
        channel.close();
    }, timeout);

    channel.register(function(event, next) {
        clearTimeout(runner);
        next();
    });

    //Clear the timeout when the channel is closed
    channel.on("closed", function() {
        clearTimeout(runner);
    });
}

exports.addTimeout = addTimeout;