azure/lib/serviceruntime/namedpipeinputchannel.js

Microsoft Azure Client Library for node

// 
// Copyright (c) Microsoft and contributors.  All rights reserved.
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//   http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// 
// See the License for the specific language governing permissions and
// limitations under the License.
// 

// Module dependencies.
var net = require('net');
var xml2js = require('azure-common').xml2js;

function NamedPipeInputChannel() {
  this.closeOnRead = true;
  this.client = null;
}

NamedPipeInputChannel.prototype.readInputChannel = function (name, parseXml, callback) {
  var callbackError = function (error) {
    error.fileName = name;
    callback(error);
  };

  this._readData(name, function (error, data) {
    if (error) {
      return callbackError(error);
    }

    var parts = data.toString().split('\r\n');

    var xml;
    // If there is more than one part (and the \r\n wasnt the final marker).
    if (parts.length > 1 && parts[1].length > 0) {
      xml = parts[1];
    } else {
      xml = parts[0];
    }

    if (parseXml) {
      var parser = new xml2js.Parser();
      error = null;
      parser.on('error', function (e) { error = e; });
      parser.parseString(xml);

      if (parser.resultObject) {
        xml = parser.resultObject;
      }
    }

    callback(error, xml);
  });
};

NamedPipeInputChannel.prototype.end = function () {
  this.client.end();
};

NamedPipeInputChannel.prototype._readData = function (name, callback) {
  var self = this;

  self.client = net.connect(name);
  self.client.on('data', function (data) {
    if (self.closeOnRead) {
      self.client.end();
    }

    callback(undefined, data);
  });

  self.client.on('error', function (error) {
    if (error.code === 'EPIPE') { return; } //Swallow EPIPE errors emitted when the connection is closed
    callback(error);
  });
};

module.exports = NamedPipeInputChannel;