Making "read from file" less blocky.

Tom Glod tom at makeshyft.com
Sun Aug 4 14:07:17 EDT 2019


Hmmm.... interesting.

I was sending binary variables to it, and the headers came through ok, but
the binary data didn't when it was over a certain size.

What sort of data sizes have you been been sending to your httpd standalone?

My tests, were 18 months ago at least, but I am hoping it was just me doing
something wrong.  I did see a "//todo" in the library code under a section
that looked like it dealt with multiple chunks.

On Sun, Aug 4, 2019 at 1:21 PM Alex Tweedly via use-livecode <
use-livecode at lists.runrev.com> wrote:

> Oh, that's a bit worrying .... I'm just starting a project that will use
> httpd, and it might in the medium term need to receive large data sets.
>
> But for now, similar to this case of yours for "serving" files, it only
> needs to send large data sets, and I have tested that pretty thoroughly
> already so I'm comfortable it'll do that just fine.
>
> Alex.
>
> On 04/08/2019 18:12, Tom Glod via use-livecode wrote:
> > Hi Alex, yes that would definitely be a great option for a high
> performance
> > solution that would work well in the background.
> >
> > I did tests on such a solution a while back (for a similar task), but
> found
> > that the httpd library was not able to receive large pieces of binary
> > data.  It worked beautiful with small chunks.
> >
> > So I don't know if it was me, if it was a missing feature in the library,
> > but I will be investigating it again soon enough.
> >
> > Thanks for the reminder
> >
> > On Sun, Aug 4, 2019 at 9:59 AM Alex Tweedly via use-livecode <
> > use-livecode at lists.runrev.com> wrote:
> >
> >> OK, here's a "really out there" suggestion ....
> >>
> >> 1. Run a local web server  to serve files (locally only).
> >>
> >>        Can be done various ways, including (easily) via LC and the httpd
> >> library,
> >>
> >>           (build that server as a standalone and have it running -
> >> started from your app if need be...)
> >>
> >> 2. in your stack, just do
> >>
> >>     load url ("http://localhost:8080/myfilename") with message
> "mycallback"
> >>
> >> and handle the file once it has been read in the "mycallback" handler
> >>
> >> -- Alex.
> >>
> >>
> >> On 04/08/2019 01:56, Tom Glod via use-livecode wrote:
> >>> Hey folks,
> >>>
> >>> I'm having trouble finding a combination of settings that allows my
> file
> >>> loading  to seem to happen in the background.
> >>>
> >>>     repeat while read_result is not "eof"
> >>>            read from file ThisFile for (1024 * 1000) bytes
> >>>            put the result into read_result
> >>>            put it after IntoThisVariable
> >>>            add length(it) to amount_read
> >>>            TSTProgress amount_read,ExpectedSize,"%","Loading File ..."
> >>> (Progress Indicator Handler)
> >>>            wait 10 milliseconds with messages
> >>>         end repeat
> >>>
> >>> no matter what I try, its still sluggish, and it seems like messages
> are
> >>> still accumilating instead of being processed by the engine.
> >>>
> >>> Am I missing something?  Normally waiting with messages sufficiently
> >> frees
> >>> the engine to allow the UI to remain responsive.
> >>>
> >>> Thanks,
> >>>
> >>> Tom
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