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node: implement DEBUG_FD env variable support

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Closes #146.
This commit is contained in:
Nathan Rajlich 2014-10-15 14:19:59 -07:00
parent 019c9ed81e
commit e4d021a223
1 changed files with 82 additions and 2 deletions
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84
node.js
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@ -25,6 +25,18 @@ exports.useColors = useColors;
exports.colors = [6, 2, 3, 4, 5, 1];
/**
* The file descriptor to write the `debug()` calls to.
* Set the `DEBUG_FD` env variable to override with another value. i.e.:
*
* $ DEBUG_FD=3 node script.js 3>debug.log
*/
var fd = parseInt(process.env.DEBUG_FD, 10) || 2;
var stream = 1 === fd ? process.stdout :
2 === fd ? process.stderr :
createWritableStdioStream(fd);
/**
* Is stdout a TTY? Colored output is enabled when `true`.
*/
@ -32,7 +44,7 @@ exports.colors = [6, 2, 3, 4, 5, 1];
function useColors() {
var debugColors = (process.env.DEBUG_COLORS || '').trim().toLowerCase();
if (0 === debugColors.length) {
return tty.isatty(1);
return tty.isatty(fd);
} else {
return '0' !== debugColors
&& 'no' !== debugColors
@ -91,7 +103,7 @@ function formatArgs() {
*/
function log() {
return console.error.apply(console, arguments);
return stream.write(util.format.apply(this, arguments) + '\n');
}
/**
@ -122,6 +134,74 @@ function load() {
return process.env.DEBUG;
}
/**
* Copied from `node/src/node.js`.
*
* XXX: It's lame that node doesn't expose this API out-of-the-box. It also
* relies on the undocumented `tty_wrap.guessHandleType()` which is also lame.
*/
function createWritableStdioStream (fd) {
var stream;
var tty_wrap = process.binding('tty_wrap');
// Note stream._type is used for test-module-load-list.js
switch (tty_wrap.guessHandleType(fd)) {
case 'TTY':
stream = new tty.WriteStream(fd);
stream._type = 'tty';
// Hack to have stream not keep the event loop alive.
// See https://github.com/joyent/node/issues/1726
if (stream._handle && stream._handle.unref) {
stream._handle.unref();
}
break;
case 'FILE':
var fs = require('fs');
stream = new fs.SyncWriteStream(fd, { autoClose: false });
stream._type = 'fs';
break;
case 'PIPE':
case 'TCP':
var net = require('net');
stream = new net.Socket({
fd: fd,
readable: false,
writable: true
});
// FIXME Should probably have an option in net.Socket to create a
// stream from an existing fd which is writable only. But for now
// we'll just add this hack and set the `readable` member to false.
// Test: ./node test/fixtures/echo.js < /etc/passwd
stream.readable = false;
stream.read = null;
stream._type = 'pipe';
// FIXME Hack to have stream not keep the event loop alive.
// See https://github.com/joyent/node/issues/1726
if (stream._handle && stream._handle.unref) {
stream._handle.unref();
}
break;
default:
// Probably an error on in uv_guess_handle()
throw new Error('Implement me. Unknown stream file type!');
}
// For supporting legacy API we put the FD here.
stream.fd = fd;
stream._isStdio = true;
return stream;
}
/**
* Enable namespaces listed in `process.env.DEBUG` initially.
*/