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requestHandlers.js
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/**
* 请求处理器.
*/
// 引入child_process模块，通过exec()实现非阻塞操作
var exec = require("child_process").exec;
var querystring = require("querystring");
var fs = require("fs");
var formidable = require("formidable");
/** 模拟阻塞带来的问题. */
function startBlock() {
console.log("Request handler 'start' was called.");
function sleep(milliSeconds) {
var startTime = new Date().getTime();
while (new Date().getTime() < startTime + milliSeconds) ;
}
// wait 10s,会阻塞所有的其他处理
sleep(10000);
return "Hello Start";
}
/** 返回empty，exec()异步 */
function startProblem() {
console.log("Request handler 'start' was called.");
var content = "empty";
exec("ls -lah", function (error, stdout, stderr) {
content = stdout;
});
return content;
}
function startExec(response) {
console.log("Request handler 'start' was called.");
// exec完成后调用回调函数输出结果
exec("ls -lah", function (error, stdout, stderr) {
response.writeHead(200, {"Content-Type": "text/plain;charset=UTF-8"});
response.write(stdout);
response.end();
});
}
function start(response, request) {
console.log("Request handler 'start' was called.");
var body = '<html>' +
'<head>' +
'<meta http-equiv="Content-Type" ' +
'content="text/html; charset=UTF-8" />' +
'</head>' +
'<body>' +
'<form action="/upload" enctype="multipart/form-data" ' +
'method="post">' +
'<input type="file" name="upload">' +
'<input type="submit" value="Upload file" />' +
'</form>' +
'</body>' +
'</html>';
response.writeHead(200, {"Content-Type": "text/html"});
response.write(body);
response.end();
}
function upload(response, request) {
console.log("Request handler 'upload' was called.");
var form = new formidable.IncomingForm();
form.uploadDir = 'tmp';
console.log("about to parse");
form.parse(request, function (error, fields, files) {
console.log("parsing done");
fs.renameSync(files.upload.path, "./tmp/test.png");
response.writeHead(200, {"Content-Type": "text/html"});
response.write("received image:<br/>");
response.write("<img src='/show' />");
response.end();
});
}
function show(response, request) {
console.log("Request handler 'show' was called.");
fs.readFile("./tmp/test.png", "binary", function (error, file) {
if (error) {
response.writeHead(500, {"Content-Type": "text/plain"});
response.write(error + "\n");
response.end();
} else {
response.writeHead(200, {"Content-Type": "image/png"});
response.write(file, "binary");
response.end();
}
});
}
exports.start = start;
exports.upload = upload;
exports.show = show;