如何捕获像EADDRINUSE这样的node.js / express服务器错误？

This is my code (It's coffeescript and uses colors but that's not relevant)

这是我的代码（它是coffeescript并使用颜色，但这不相关）

# If this module is executed
if !module.parent
    # Start server
    try
        hons_server.listen config.port
        console.log 'Listening to port ' + config.port
    catch err
        console.error "Couldn't start server: #{String(err)}".red

hons_server is an express.js server. I'm having a hard time understanding why errors thrown as a result of hons_server.listen() aren't caught by the try/catch. When I run my server twice I get the output:

hons_server是一个express.js服务器。我很难理解为什么由于hons_server.listen（）抛出的错误没有被try / catch捕获。当我运行我的服务器两次时，我得到输出：

$ coffee src/server.coffee
Listening to port 9090

node.js:201
        throw e; // process.nextTick error, or 'error' event on first tick
              ^
Error: listen EADDRINUSE
    at errnoException (net.js:632:11)
    at Array.0 (net.js:733:26)
    at EventEmitter._tickCallback (node.js:192:40)

I'd like to know why the thrown error isn't caught, and how/where I can catch the EADDRINUSE error.

我想知道为什么没有捕获抛出的错误，以及我如何/在哪里可以捕获EADDRINUSE错误。

2 个解决方案

#1

Listen for the error event on the server isntance

侦听服务器上的错误事件

hons_server.on 'error', (err) ->
    console.log 'there was an error:', err.message

#2

The accepted solution did not work for me on nodejs 0.8.22 and express 3.1.0.

在nodejs 0.8.22和express 3.1.0上，我接受的解决方案对我不起作用。

This did the trick:

这样就可以了：

process.on('uncaughtException', function(err) {
    if(err.errno === 'EADDRINUSE')
         console.log(...);
    else
         console.log(err);
    process.exit(1);
});

Also see Node.js Express app handle startup errors

另请参阅Node.js Express应用程序处理启动错误

#1