正在处理OpenShift上托管的Node.js restful Web服务。目前我已经成功使用简单的方法调用等,但似乎无法通过异步回调获得http响应。
以下是我目前的情况:
var http = require("http");
var url = require("url"); // used to get the requested method name as well as parameters
var util = require("util");
// global variables
// router function
function route(pathname, query, callbackFunc) {
//return executeMethod(pathname, query);
var returnValue;
switch (pathname.toUpperCase()) {
case "/ADD":
returnValue = add(query['num1'], query['num2']);
//util.process.nextTick(function() {
//callbackFunc(null, returnValue);
//});
break;
case "/ADDASYNC":
//addAsync(query['num1'], query['num2'], callback);
break;
default:
returnValue = "method not found";
break;
}
//return returnValue;
//return "Route for request " + pathname + " complete, query: " + query;
}
// actual web method execution
function add(num1, num2){
//return "add method called with values: " + num1 + " " + num2;
return parseFloat(num1) + parseFloat(num2);
}
function addAsync(num1, num2, callback){
//util.process.nextTick(function(){
// var value = parseFloat(num1) + parseFloat(num2);
// util.process.nextTick(function(){
// callback(value);
// });
//});
}
// main request handler for server
function onRequest(request, response) {
var pathname = url.parse(request.url).pathname;
var query = url.parse(request.url, true).query;
console.log("Request for " + pathname + " Recieved");
response.setTimeout(500);
var myCallback = function(err, data){
if(err){
response.writeHead(200, {"Content-Type": "text/plain"});
response.write('an error occured with requested method');
response.end();
}else{
response.writeHead(200, {"Content-Type": "text/plain"});
response.write(data);
response.end();
}
}
//var finalValue = route(pathname, query);
//var finalValue = 0;
(function(){route(pathname, query, myCallback)})();
response.writeContinue();
//process.nextTick(myCallback(null, 'hello world'));
setTimeout(function(){
myCallback(null, "hello world");
}, 15);
//myCallback();
//response.writeHead(200, {"Content-Type": "text/plain"});
//response.write("Hello World. You requested: " + pathname + " with type " + pathname.type + ", value: " + finalValue);
//response.end();
}
// create the server and signal console of start
http.createServer(onRequest).listen(8080, process.env.OPENSHIFT_INTERNAL_IP);
// for debug
//http.createServer(onRequest).listen(process.env.PORT, process.env.IP);
console.log("Server has started. Listening to port: " + 8080 + " ip address: " + process.env.OPENSHIFT_INTERNAL_IP);
如果我直接在onRequest方法中调用myCallback方法,那么我会得到一个没有任何问题的响应;但是,使用process.nextTick或setTimeout调用onRequest或路由方法中的myCallback函数似乎不起作用。我正在使用Cloud9 IDE进行这个项目,直接git推送到OpenShift,所以我在调试时遇到了一些困难,但尝试了很多不同的方法但没有成功,包括设置request.setTimeout函数为它提供一些时间要触发的计时器/进程事件。我当前的OpenShift应用程序正在运行Node.js 0.6。是否有任何明显可能导致我可能会遗漏的问题?
答案 0 :(得分:2)
我通过这样做让你的setTimeout工作:
让nextTick工作:
你应该看看你现在做错了什么。