Node.js未被捕获的套接字exception – 套接字已closures

这是问题。 在写入一个封闭的套接字的时候，我得到一个exception，并且这个exception没有被try catch捕获，大概是因为它在promise中。

promise.then(function (val) { try { sock.write(val + tcpDelimiter); } catch (err) { logger.info('yeah right this will not work at all'); } }) .fail(function (error) {}); 

而且，将process.uncaughtexception添加到主应用程序也无济于事。

这是控制台输出：

  2012-10-04T19:22:21.109Z - error: uncaughtException date=Thu Oct 04 2012 19:22:21 GMT+0000 (UTC), pid=21508, uid=0, gid=0, cwd=/home/ec2-user/js-proxy, execPath=/usr/bin/nodejs, version=v0.6.18, argv=[/usr/local/bin/node, /home/ec2-user/js-proxy/app.js, --jsproxy], rss=13914112, heapTotal=5634752, heapUsed=4082564, loadavg=[0.0380859375, 0.08056640625, 0.060546875], uptime=1721344.103162099, trace=[column=19, file=net.js, function=Socket._write, line=474, method=_write, native=false, column=15, file=net.js, function=Socket.write, line=466, method=write, native=false, column=24, file=/home/ec2-user/js-proxy/app.js, function=null, line=408, method=null, native=false, column=32, file=/home/ec2-user/js-proxy/node_modules/q/q.js, function=_fulfilled, line=860, method=null, native=false, column=34, file=/home/ec2-user/js-proxy/node_modules/q/q.js, function=null, line=881, method=null, native=false, column=9, file=/home/ec2-user/js-proxy/node_modules/q/q.js, function=makePromise.promiseSend, line=553, method=promiseSend, native=false, column=28, file=/home/ec2-user/js-proxy/node_modules/q/q.js, function=null, line=880, method=null, native=false, column=9, file=/home/ec2-user/js-proxy/node_modules/q/q.js, function=makePromise.promiseSend, line=553, method=promiseSend, native=false, column=35, file=/home/ec2-user/js-proxy/node_modules/q/q.js, function=, line=465, method=null, native=false, column=38, file=node.js, function=EventEmitter._tickCallback, line=190, method=_tickCallback, native=false], stack=[Error: This socket is closed., at Socket._write (net.js:474:19), at Socket.write (net.js:466:15), at /home/ec2-user/js-proxy/app.js:408:24, at _fulfilled (/home/ec2-user/js-proxy/node_modules/q/q.js:860:32), at /home/ec2-user/js-proxy/node_modules/q/q.js:881:34, at makePromise.promiseSend (/home/ec2-user/js-proxy/node_modules/q/q.js:553:9), at /home/ec2-user/js-proxy/node_modules/q/q.js:880:28, at makePromise.promiseSend (/home/ec2-user/js-proxy/node_modules/q/q.js:553:9), at Array.<anonymous> (/home/ec2-user/js-proxy/node_modules/q/q.js:465:35), at EventEmitter._tickCallback (node.js:190:38)] 

更新：我在一个Node.js的谈话，并了解了一些exception处理; 显然这很平淡，而且被忽略了。 正在进行中。

Answer 1

最简单的修复似乎是在写入之前检查套接字是否可写。 你也可以检查被毁坏的财产。 这东西全部在套接字closures事件中设置。

 promise.then(function (val) { if( sock.writable ){ sock.write(val + conf.proxy.tcpDelimiter); } else { logger.info('this works'); } }) .fail(function (error) {});