> I've heard that generators helps to catch errors but didn't seen any good
> explanation how to do that, if anyone knows such an article please post
> link here
>
With the galaxy library, you just use try/catch to handle errors with
generators. The model is the same as async/await in other languages: you
declare your async functions with function* and you call async functions
with yield. So your code is made of function* functions calling other
function* function through yield and exceptions propagate as you'd expect
them to through these call chains. Typical galaxy code structure looks like:
function* f1(request, response) { try { yield f2(request, response); }
catch (ex) { handleError(ex); } }
function* f2(request, response) { yield f3(request, response); yield
f4(request, response); }
function* f3(request, response) { yield f5(request, response); ... }
function* f4(request, response) { ... }
function* f5(request, response) { ... }
And ex.stack gives you both the "async" stack trace (f1 -> f2 -> f3 -> ...)
and the raw stack trace.
IMO the "standard" node guidelines are suitable for people who develop
low-level I/O libraries. If you are writing applications rather than
libraries you are much better off with "non-standard" solutions that give
you higher level constructs (sync style), robust error handling, etc.
Note: I designed galaxy but we are not using it directly. We are using it
through streamline which gives us a leaner/cleaner syntax and also the
option to toggle between 3 runtime options (callbacks, fibers, generators).
Bruno
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