Waiting for result from net.HTTPClient:request

[cecolon 0]

I have just started using this function to try to get some information from a remote JSON API. As far as I can understand, this function takes callback functions which access the result. I would like to make a function that returns this result, however, I can't seem to get it working right (tried to insert a busy wait after the request, which waited for a flag set by the callback functions. But then, the callbacks were never called).

 

Basically, I want to make a function which makes the HTTP request and returns data to the caller. Can anyone point me to the best practices here?

[petergebruers 1,268]

A related question was answered by me some time ago.

 

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Does this help?

Edited October 15, 2016 by petergebruers

[cecolon 0]

Thank you! Not entirely, I want to pass control to another part of the program, while your final solution seems to pack the overall flow control of your program into the callbacks.

[petergebruers 1,268]

The HTTP client always uses callbacks, there is not other way. So, if you want to call function xyz() after you get a result from the web server, you have to call xyz() from within the function assigned to the "success" parameter. You'll have to pass stuff around, but that's the way to do it. Basically, you need to forget about "returning data from http client" because it doesn't work that way. The HTTP client does not return, instead it calls the function pointed to by the "success" field.

 

Also, the callbacks can only run if your main code ends. So doing a "while true do" loop is a no-go either. You have to chain everything via the function you assign to the "success" parameter. Of course, if you want to loop indefinitely, just do a recursive call...