I am doing REST interface with vibed. And thinking about handling errors, if users forgot to pass all expected args in function.

For example:
foo(int x, int y) // get request
{

}

/api/foo?x=111

And if user is forgot to pass `y` we will get error in the browser. What is the right way to handle curch cases?

Wrap is with try-catch looks wrong.

On Monday, 29 May 2017 at 12:23:59 UTC, Suliman wrote:
> I am doing REST interface with vibed. And thinking about handling errors, if users forgot to pass all expected args in function.
>
> For example:
> foo(int x, int y) // get request
> {
>
> }
>
> /api/foo?x=111
>
> And if user is forgot to pass `y` we will get error in the browser. What is the right way to handle curch cases?
>
> Wrap is with try-catch looks wrong.

It's seems I found how to do it http://vibed.org/api/vibe.web.web/errorDisplay

On Monday, 29 May 2017 at 12:23:59 UTC, Suliman wrote:
> I am doing REST interface with vibed. And thinking about handling errors, if users forgot to pass all expected args in function.
>
> For example:
> foo(int x, int y) // get request
> {
>
> }
>
> /api/foo?x=111
>
> And if user is forgot to pass `y` we will get error in the browser. What is the right way to handle curch cases?
>
> Wrap is with try-catch looks wrong.

That depends on wether or not there is a sensible default for y, if so
    foo(int x, int y=0)
ought to work.

I wrote next code:

        void foo(string _error = null)
        {
            writeln("Error");
        }
    override:
        @errorDisplay!foo
        Json doTrackSpeedAnalyze(int trackid, string startDateTime, string endDateTime) // /api/mytrack?trackid=123&startDateTime=2000&endDateTime=2010
        {
            if(endDateTime.length == 0)
            {
                throw new Exception("End Date must not be empty");
            }
            return Json.emptyObject;
        }

If I access to url:  /api/mytrack?trackid=123&startDateTime=2000 (witout endDateTime) I am expecting execution foo() block, but it does not happens. Why?

And what do Exception here? Why should handle it?

@rootPathFromName
interface API
{
    @path("mytrack")           @method(HTTPMethod.GET)    Json doTrackSpeedAnalyze(int trackid, string startDateTime, string endDateTime);
}

class MyRouter : API
{
   Config config;
   Database database;
   this(Config config, Database database)
   {
    this.config = config;
    this.database = database;
   }

        @path("/")
        void foo(string _error = null) // I expect that this will be called if exception happen in doTrackSpeedAnalyze
        {
            writeln("Error in console"); // does not writing on console
        }
     override:
        @errorDisplay!foo
        Json doTrackSpeedAnalyze(int trackid, string startDateTime, string endDateTime) // /api/mytrack?trackid=123&startDateTime=2000&endDateTime=2010
        {
            if(endDateTime == "0")
            {
                throw new Exception("Some fields are empty");
            }
            return Json.emptyObject;
        }

}


What I am doing wrong? Should I do  override for foo? Should foo present in `interface`?

I had post question here http://forum.rejectedsoftware.com/groups/rejectedsoftware.vibed/thread/43511/