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lib: consistent callback checking across project #3539

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lib: consistent callback checking across project #3539

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2 changes: 1 addition & 1 deletion lib/_http_client.js
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Original file line number Diff line number Diff line change
Expand Up @@ -532,7 +532,7 @@ ClientRequest.prototype._deferToConnect = function(method, arguments_, cb) {
};

ClientRequest.prototype.setTimeout = function(msecs, callback) {
if (callback) this.once('timeout', callback);
if (typeof callback === 'function') this.once('timeout', callback);

var self = this;
function emitTimeout() {
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2 changes: 1 addition & 1 deletion lib/_http_incoming.js
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Expand Up @@ -63,7 +63,7 @@ exports.IncomingMessage = IncomingMessage;


IncomingMessage.prototype.setTimeout = function(msecs, callback) {
if (callback)
if (typeof callback === 'function')
this.on('timeout', callback);
this.socket.setTimeout(msecs);
return this;
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9 changes: 5 additions & 4 deletions lib/_http_outgoing.js
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Expand Up @@ -90,11 +90,12 @@ exports.OutgoingMessage = OutgoingMessage;

OutgoingMessage.prototype.setTimeout = function(msecs, callback) {

if (callback) {
if (typeof callback !== 'function')
throw new TypeError('callback must be a function');
if (typeof callback === 'function') {
this.on('timeout', callback);
}
else if (callback) {
throw new TypeError('callback must be a function');
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continuing https://github.com/nodejs/node/pull/3539/files#r43079350

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@thefourtheye so you are suggesting that this Type check shouldn't be done.

@Trott suggested otherwise in --> #3539 (comment)

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@jasnell was for it as well --> #3539 (comment)

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I'm for it if there is the typeof check. I think @thefourtheye is saying that you can discard the typeof check and the else block and just pass blindly to .on() because .on() will throw a TypeError if the callback is not a function. At least, that's my understanding. So I'm for either approach, really. Don't make no neither nor to me.

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In other words, I think @thefourtheye is saying this would be fine:

if (callback) {
    this.on('timeout', callback);
}

Which throws a wrench in the whole "standardize on typeof checks" approach.

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We need that if guard if and only if callback might be optional and therefore undefined. I didn't look at the code to see if that is actually possible.

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Right... At least the event handler code doesn't need this if block as it is done anyway in on, once, {add,remove}listener functions

}

if (!this.socket) {
this.once('socket', function(socket) {
Expand Down Expand Up @@ -482,7 +483,7 @@ OutgoingMessage.prototype.write = function(chunk, encoding, callback) {

function writeAfterEndNT(self, err, callback) {
self.emit('error', err);
if (callback) callback(err);
if (typeof callback === 'function') callback(err);
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This is an interesting one. Prior to the change a callback that isn't a function would throw. In this instance it would fail silently

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Probably needs an else if (callback) throw … or something like that

}


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2 changes: 1 addition & 1 deletion lib/_http_server.js
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Expand Up @@ -249,7 +249,7 @@ util.inherits(Server, net.Server);

Server.prototype.setTimeout = function(msecs, callback) {
this.timeout = msecs;
if (callback)
if (typeof callback === 'function')
this.on('timeout', callback);
return this;
};
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4 changes: 2 additions & 2 deletions lib/_tls_wrap.js
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Expand Up @@ -504,7 +504,7 @@ TLSSocket.prototype.renegotiate = function(options, callback) {
this._rejectUnauthorized = rejectUnauthorized;
}
if (!this._handle.renegotiate()) {
if (callback) {
if (typeof callback === 'function') {
process.nextTick(callback, new Error('Failed to renegotiate'));
}
return false;
Expand All @@ -513,7 +513,7 @@ TLSSocket.prototype.renegotiate = function(options, callback) {
// Ensure that we'll cycle through internal openssl's state
this.write('');

if (callback) {
if (typeof callback === 'function') {
this.once('secure', function() {
callback(null);
});
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2 changes: 1 addition & 1 deletion lib/crypto.js
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Expand Up @@ -563,7 +563,7 @@ function pbkdf2(password, salt, iterations, keylen, digest, callback) {

// at this point, we need to handle encodings.
var encoding = exports.DEFAULT_ENCODING;
if (callback) {
if (typeof callback === 'function') {
var next = function(er, ret) {
if (ret)
ret = ret.toString(encoding);
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2 changes: 1 addition & 1 deletion lib/dgram.js
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Expand Up @@ -319,7 +319,7 @@ Socket.prototype.send = function(buffer,
req.length = length;
req.address = address;
req.port = port;
if (callback) {
if (typeof callback === 'function') {
req.callback = callback;
req.oncomplete = afterSend;
}
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10 changes: 5 additions & 5 deletions lib/fs.js
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Expand Up @@ -213,7 +213,7 @@ fs.exists = function(path, callback) {
req.oncomplete = cb;
binding.stat(pathModule._makeLong(path), req);
function cb(err, stats) {
if (callback) callback(err ? false : true);
if (typeof callback === 'function') callback(err ? false : true);
}
};

Expand Down Expand Up @@ -1151,16 +1151,16 @@ function writeAll(fd, isUserFd, buffer, offset, length, position, callback_) {
fs.write(fd, buffer, offset, length, position, function(writeErr, written) {
if (writeErr) {
if (isUserFd) {
if (callback) callback(writeErr);
if (typeof callback === 'function') callback(writeErr);
} else {
fs.close(fd, function() {
if (callback) callback(writeErr);
if (typeof callback === 'function') callback(writeErr);
});
}
} else {
if (written === length) {
if (isUserFd) {
if (callback) callback(null);
if (typeof callback === 'function') callback(null);
} else {
fs.close(fd, callback);
}
Expand Down Expand Up @@ -1198,7 +1198,7 @@ fs.writeFile = function(path, data, options, callback_) {

fs.open(path, flag, options.mode, function(openErr, fd) {
if (openErr) {
if (callback) callback(openErr);
if (typeof callback === 'function') callback(openErr);
} else {
writeFd(fd, false);
}
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4 changes: 2 additions & 2 deletions lib/net.js
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Expand Up @@ -299,13 +299,13 @@ Socket.prototype.listen = function() {
Socket.prototype.setTimeout = function(msecs, callback) {
if (msecs === 0) {
timers.unenroll(this);
if (callback) {
if (typeof callback === 'function') {
this.removeListener('timeout', callback);
}
} else {
timers.enroll(this, msecs);
timers._unrefActive(this);
if (callback) {
if (typeof callback === 'function') {
this.once('timeout', callback);
}
}
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8 changes: 4 additions & 4 deletions lib/zlib.js
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Expand Up @@ -410,7 +410,7 @@ Zlib.prototype.params = function(level, strategy, callback) {
if (!self._hadError) {
self._level = level;
self._strategy = strategy;
if (callback) callback();
if (typeof callback === 'function') callback();
}
});
} else {
Expand Down Expand Up @@ -438,10 +438,10 @@ Zlib.prototype.flush = function(kind, callback) {
}

if (ws.ended) {
if (callback)
if (typeof callback === 'function')
process.nextTick(callback);
} else if (ws.ending) {
if (callback)
if (typeof callback === 'function')
this.once('end', callback);
} else if (ws.needDrain) {
var self = this;
Expand All @@ -455,7 +455,7 @@ Zlib.prototype.flush = function(kind, callback) {
};

Zlib.prototype.close = function(callback) {
if (callback)
if (typeof callback === 'function')
process.nextTick(callback);

if (this._closed)
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