On Sat, Sep 20, 2014 at 9:17 AM, Bruno Jouhier <[email protected]> wrote:
> How do you implement it with async?
This is a good question, so here's an example translation (not the only way
to do it):
CDN.use(config.CDN.baseUrl, function(req, res, next) {
if(err) return next(err);
async.waterfall([
function (cb) {
fs.lstat(config.base+"/cdn"+req.url, cb);
},
function (stats, cb) {
if(stats.isSymbolicLink()) {
async.waterfall([
function (cb) {
fs.readlink(config.base+"/cdn"+req.url, cb);
},
function (linkstr, cb) {
log.info("Redirecting request \""+req.url+"\"
to \""+linkstr);
fs.readFile(linkstr, cb);
},
], cb);
}
}
], function (err, data) {
if (err) return next(err);
res.writeHead(200,{"Content-type":"text/html"});
res.end(data);
});
});
It's more code, but it improves the error checking. If it didn't have that
"if" statement in there it would be a lot simpler - async code doesn't deal
well with "if" statements I've found (there's no way to short-circuit).
Matt.
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