How can I download content into a local cache to decrease channel package size?

Issue

My channel package is over 4mb.

Environment

SDK

Answer

To download content into a local cache, you can use this:

xfer=createobject("roUrlTransfer")
xfer.SetCertificatesFile("common:/certs/ca-bundle.crt")
xfer.seturl("https://my.server.com/image.jpg")
xfer.gettofile("cachefs:/image_I_want_to_cache.jpg")

You will need to check if the file is in the cachefs before downloading.

Here is some sample code:

xfer.seturl(image.url.gettext())
      'find last slash
        txtstr=image.url.gettext()
        txtstr=mid(txtstr,instr(txtstr,"//")+1)
        while instr(txtstr,"/") > 0
          txtstr=mid(txtstr,instr(txtstr,"/")+1)
        end while

        ttimer=createobject("rotimespan")
        ttimer.mark()
        if not fs.exists("cachefs:/"+txtstr) then

            print "not in cache, get image"
            xfer.seturl(image.url.gettext())
            xfer.gettofile("cachefs:/"+txtstr)
            print "transfer time";ttimer.totalmilliseconds()

        else
            print "found in cache!!!"
        end if
        print "transfer time";ttimer.totalmilliseconds()

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