cluster-service/lib/run.js

Turns your single process code into a fault-resilient multi-process service with built-in REST & CLI support

var util = require("util"),
  http = require("http"),
  querystring = require("querystring"),
  options = null,
  cservice = require("../cluster-service");

exports.start = function(o, cb) {
  var cmd;
  options = o;

  cmd = options.run;
  delete options.run;

  run(cmd, cb);
};

function run(question, cb) {
  var qs = querystring.stringify({
    cmd: question,
    accessKey: options.accessKey
  });
  var body = "", err;
  var url = "http://"
    + (options.host || "localhost")
    + ":"
    + (options.port || 11987)
    + "/cli"
    + "?" + qs
    ;
  cservice.log(
    "Running remote command: ".warn
    + url.replace(/accessKey=.*/i, "accessKey={ACCESS_KEY}").data
    );
  http.request({
      host: options.host || "localhost",
      port: options.port || 11987,
      path: "/cli?" + qs,
      method: "POST"
    }
    , function(res) {
      res.setEncoding('utf8');
      res.on("data", function(chunk) {
        body += chunk;
      });
      res.on("end", function() {
        if (res.statusCode !== 200 && body) {
          err = body;
        }
        if (err) {
          cservice.error("Error: ", err);
          body = {statusCode: res ? res.statusCode : "no response", error: err};
        } else if (
          typeof body === "string"
          && (
            body.indexOf("{") === 0
            || body.indexOf("[") === 0
            )
          ) {
          body = JSON.parse(body); // deserialize
        }
        if (options.json === true) {
          cservice.results(JSON.stringify(body));
        } else {
          cservice.results(util.inspect(body, {depth: null, colors: true}));
        }

        if (cb) {
          cb(err, body);
        }
      });
    }
  ).on(
    "error"
    , function(err) {
      body = err;

      if (options.json === true) {
        cservice.results(JSON.stringify(body));
      } else {
        cservice.results(util.inspect(body, {depth: null, colors: true}));
      }

      if (cb) {
        cb(err, body);
      }
    }
  )
  .end();
}