Created
May 9, 2012 01:18
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process.on('error', function(er) { | |
console.error('error on process', er); | |
}); | |
process.stdout.on('error', function(er) { | |
console.error('error on stdout', er); | |
}); | |
process.stderr.on('error', function(er) { | |
// hah, this will probably fail... | |
console.error('error on stderr', er); | |
}); | |
var EE = require('events').EventEmitter; | |
EE.prototype.emit = (function(orig) { | |
return function() { | |
if (this.listeners('error').length === 0 && arguments[0] !== 'newListener') { | |
console.error(this.constructor.name, this); | |
throw new Error('EE without an error listener'); | |
} | |
return orig.apply(this, arguments); | |
}; | |
})(EE.prototype.emit); | |
var http = require('http'); | |
http.globalAgent.on('error', function(er) { | |
console.error('error on agent', er); | |
}); | |
console.error('global agent error listeners', http.globalAgent.listeners('error')); | |
var server = http.createServer(function(req, res) { | |
req.on('error', function(er) { | |
console.error('error on server request', er); | |
}); | |
res.on('error', function(er) { | |
console.error('error on server response', er); | |
}); | |
res.writeHead(200); | |
res.write('ready?\n'); | |
setTimeout(function() { | |
res.end('go!\n'); | |
server.close(); | |
}, 100); | |
}); | |
server.on('error', function(er) { | |
console.error('error on server', er); | |
}); | |
server.listen(1337, function() { | |
var req = http.request({ host: 'localhost', | |
port: 1337, | |
path: '/', | |
agent: http.globalAgent, | |
method: 'GET' }); | |
req.on('error', function(er) { | |
console.error('error on client request', er); | |
}); | |
req.on('response', function(res) { | |
res.on('error', function(er) { | |
console.error('error on client response', er); | |
}); | |
res.pipe(process.stdout); | |
}); | |
req.end(); | |
}); | |
/* | |
$ ./node must-have-errors.js | |
global agent error listeners [ [Function] ] | |
ready? | |
go! | |
Socket { _handle: | |
{ writeQueueSize: 0, | |
socket: [Circular], | |
onread: [Function: onread] }, | |
_pendingWriteReqs: 0, | |
_flags: 0, | |
_connectQueueSize: 0, | |
destroyed: false, | |
errorEmitted: false, | |
bytesRead: 97, | |
bytesWritten: 64, | |
allowHalfOpen: undefined, | |
_connecting: false, | |
writable: true, | |
_events: | |
{ free: [Function], | |
close: [ [Function] ], | |
agentRemove: [Function], | |
error: [] }, | |
_httpMessage: | |
{ output: [], | |
outputEncodings: [], | |
writable: true, | |
_last: true, | |
chunkedEncoding: false, | |
shouldKeepAlive: true, | |
useChunkedEncodingByDefault: false, | |
_hasBody: true, | |
_trailer: '', | |
finished: true, | |
agent: | |
{ options: {}, | |
requests: {}, | |
sockets: [Object], | |
maxSockets: 5, | |
_events: [Object], | |
createConnection: [Function] }, | |
socketPath: undefined, | |
method: 'GET', | |
path: '/', | |
_headers: { host: 'localhost:1337' }, | |
_headerNames: { host: 'Host' }, | |
_events: { error: [Object], response: [Function] }, | |
_header: 'GET / HTTP/1.1\r\nHost: localhost:1337\r\nConnection: keep-alive\r\n\r\n', | |
_headerSent: true, | |
socket: [Circular], | |
connection: [Circular], | |
parser: | |
{ _headers: [], | |
_url: '', | |
onHeaders: [Function: parserOnHeaders], | |
onHeadersComplete: [Function: parserOnHeadersComplete], | |
onBody: [Function: parserOnBody], | |
onMessageComplete: [Function: parserOnMessageComplete], | |
socket: [Circular], | |
incoming: [Object], | |
onIncoming: [Function] }, | |
res: | |
{ socket: [Circular], | |
connection: [Circular], | |
httpVersion: '1.1', | |
complete: true, | |
headers: [Object], | |
trailers: {}, | |
readable: false, | |
url: '', | |
method: null, | |
statusCode: 200, | |
client: [Circular], | |
httpVersionMajor: 1, | |
httpVersionMinor: 1, | |
upgrade: false, | |
_events: [Object] } }, | |
ondrain: [Function], | |
ondata: [Function], | |
onend: [Function], | |
_connectQueue: null, | |
readable: true } | |
/Users/isaacs/dev/js/node-v0.6/must-have-errors.js:19 | |
throw new Error('EE without an error listener'); | |
^ | |
Error: EE without an error listener | |
at Socket.emit (/Users/isaacs/dev/js/node-v0.6/must-have-errors.js:19:13) | |
at IncomingMessage.<anonymous> (http.js:1303:18) | |
at IncomingMessage.<anonymous> (events.js:88:20) | |
at IncomingMessage.emit (/Users/isaacs/dev/js/node-v0.6/must-have-errors.js:21:17) | |
at HTTPParser.parserOnMessageComplete [as onMessageComplete] (http.js:127:21) | |
at Socket.ondata (http.js:1179:24) | |
at TCP.onread (net.js:374:27) | |
*/ |
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