Plenty of tools have been developed to solve this problem.
See
http://spion.github.io/posts/analysis-generators-and-other-async-patterns-node.html
for a comparison.
Here is how I write your example (handling the else clause of your if test
BTW):
CDN.use(config.CDN.baseUrl, function(req, res, next, _) {
var path = config.base + "/cdn" + req.url;
if (fs.lstat(path, _).isSymbolicLink()) path = fs.readlink(path, _);
res.writeHead(200, { "Content-type" : "text/html" });
res.end( fs.readFile(path, _));
});
Bruno
On Monday, September 15, 2014 6:28:28 PM UTC+2, Ingwie Phoenix wrote:
>
> Hai, everyone.
>
> So I just figured out that Connect’s static file servers dont work well
> with symlinks…so I had tow rite myself a little workaround, a fallback
> router, per-se. But whilst I did so, I had a nice meeting with the callback
> hell. Here’s my code:
>
> CDN.use(config.CDN.baseUrl, function(req, res, next){
> if(err) { next(); throw err; }
> fs.lstat(config.base+"/cdn"+req.url, function(err,stats){
> if(stats.isSymbolicLink()) {
> fs.readlink(config.base+"/cdn"+req.url,
> function(err, linkstr){
> if(err) throw err;
> log.info("Redirecting request \""+req.url+"\"
> to \""+linkstr);
> fs.readFile(linkstr, function(err, data){
> if(err) throw err;
>
> res.writeHead(200,{"Content-type":"text/html"});
> res.end(data);
> });
> });
> }
> });
> });
> });
>
> Okay…thats lots. And how does one get around this and into a bit of nicer
> code? It almost looks like a little pyramid there…
>
> Kind regards, Ingwie.
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