libUrl tsNet and socketTimeoutInterval
Sannyasin Brahmanathaswami
brahma at hindu.org
Sun Dec 10 14:46:43 EST 2017
@ Charles
It would appear that perhaps there is a possible global approach that could cover a wide variety of net access conditions.
am I being naïve or could it be this simple?
if we just have this running and available all the time
tsNetSetTimeouts… [add your params here]
tsNetSetStatusCallback "urlCallProgressUpdate"
on urlCallProgressUpdate
# check the status of any and all URL download operations
# give user feedback in case connection drops or transfers speed drops below low limit
end urlCallProgressUpdate
maybe that's really all that is needed. Then we don't worry about or code any kind of status monitoring into specific URL operations.
One could "dynamically" change the time outs if different scenarios called for allowing longer time spans, i.e users expect a wait while downloading a "package" but they the don't when loading a web page.
we might simply have this in back script for the whole app
command toggleNetMonitor pBool
if pBool = "true" then
tsNetSetStatusCallback urlCallProgressUpdate
else
tsNetSetStatusCallback ""
end if
end toggleNetMonitor
I don't know if there is any overhead to leaving this call back be live "24-7-365" in the app or not… but this way we could turn it on and off if that is better practice.
BR
On 12/8/17, 5:08 PM, "use-livecode on behalf of Sannyasin Brahmanathaswami via use-livecode" <use-livecode-bounces at lists.runrev.com on behalf of use-livecode at lists.runrev.com> wrote:
Ralph -- I sent this to you off list by mistake
copying here FWIW if anyone is lurking. This all looks great and covers "download files" use cases
The remaining puzzles are one off url calls from/for mobile controls :
1) remote path to audio.mp3; for player
2) url web calls in browser widget to
a) web pages
b) youtube (video streaming)
and how these play with TSNet, bandwidth dropping below set limits, or dropped connections.
As yet mysterious….
" <rdimola at evergreeninfo.net> wrote:
BR,
I async also works in iOS just fine and dandy. In My app I am getting the background images for cards while the user first logs in. Async allows the images to be downloaded in the background. This allows me to change images without releasing a new app without hanging the app up when I used blocking libURL. The implementation was so easy it was frightening. I also have 6 of these queued up and running at the same time!
First is a utility(NetworkType) to check the type of networking and a tsNet initialization handler (EISinitTSnet):
--------------------------------------------------------
function GetNetworkType
local tLibUrlDriver
try
put the behavior of stack"revLibUrl"into tLibUrlDriver
end try
if tLibUrlDriver is empty then
return "Sockets"
else
return "tsNet"
end if
end GetNetworkType
command NetworkType
if GetNetworkType() = "Sockets" then
answer"tsNet is disabled"
else
answer "tsNet in use"&cr&"Version==>"& tsNetVersion()
end if
end NetworkType
command EISinitTSnet
local tResult
try
tsNetInit
put the result into tResult
if tResult is not empty then
if tResult = "tsneterr: Already initialised" then
else
answer tResult
end if
else
tsNetSetTimeouts 60, 5000, 5000, 5000, 5, 10000
end if
catch someerror
if IsInternalUser(true) then answer TranslateError(someerror)
end try
end EISinitTSnet
----------------------------------------------------------------------------------------------------
The Get_Path function below is a function returns paths that are transparent between IDE and mobile. (Richard G. I got sucked into the returning the trailing slash before I realized it was not the best way to do it). I hacked out this code so there could be an error but the basic idea is here.
I call this first handler(StartBackgroundImageDownload) 12 time quickly and all the downloads work. The app is fully functional while the downloads are in progress. I use the filename as the pID. This makes things easy when the download completes. I have not tested timeouts yet. That's the next step, handling the in/out of network access/slow network speed. Standby....
This is the guts of the asysnc file downloading:
---------------------------------------------------------------------------------------------------
command StartBackgroundImageDownload pImageName
local pHeaders, tStatus
put tsNetGetFile(pImageName, Get_Path("Updates")&pImageName, \
"https://xxx.com/someFolder/"& \
urlencode(pImageName), pHeaders, "DownLoadBackgroundImageComplete") into tStatus-- start download
if tStatus is not empty then
answer tStatus
end if
end StartBackgroundImageDownload
on DownLoadBackgroundImageComplete pID, pResult, pBytes, pCurlCode
local tData, tHeaders
--answer "File==>"&pID&cr&"Bytes==>"&pBytes&cr&"Result==>"&pResult&cr&"CurlCode==>"&pCurlCode
if pCurlCode is not 0 then
answer tsNetRetrError(pID)
else
if pResult = 404 then
answer "File'"&&pID&&"not found==>"&pBytes&&"Result==>"&pResult
delete file Get_Path("Updates")&pID -- delete file with 404 error in it
else
--answer "File==>"&pID&cr&"Bytes==>"&pBytes&cr&"Result==>"&pResult&cr&"CurlCode==>"&pCurlCode
if pBytes > 2000 then -- GOOD DOWNLOAD
rename file (Get_Path("Updates")&pID) to (Get_Path("BackgroundImages")&pID) -- file download complete
--answer "File'"&&pID&&"has been downloaded. Result==>"&pResult
else
answer "File'"&&pID&&"has been downloaded but is too small==>"&pBytes&&"Result==>"&pResult -- this was before I had the 404 check
delete file Get_Path("Updates")&pID
end if
end if
end if
tsNetCloseConn pID
end DownLoadBackgroundImageComplete
---------------------------------------------------------------------
Ralph DiMola
IT Director
Evergreen Information Services
rdimola at evergreeninfo.net
-----Original Message-----
From: use-livecode [mailto:use-livecode-bounces at lists.runrev.com] On Behalf Of Sannyasin Brahmanathaswami via use-livecode
Sent: Friday, December 08, 2017 2:21 PM
To: How to use LiveCode
Cc: Sannyasin Brahmanathaswami
Subject: Re: libUrl tsNet and socketTimeoutInterval
Awesome Ralph:
Looks like we need to crowd fund Charles for documentation (smile)
You are about 3 days ahead of me… can you post some code snippets of your methods?
On 12/7/17, 1:54 PM, "use-livecode on behalf of Ralph DiMola via use-livecode" <use-livecode-bounces at lists.runrev.com on behalf of use-livecode at lists.runrev.com> wrote:
Ok, I just got async tsNet working in IDE and Android(Testing iOS later). I works great! Hat tip to all the contributors. One question and one Observation:
1) How do you query the current tsNet timeout settings? I have quite a few places where I save the socketTimeoutInterval, set it to a new value, do something and then set it back to the saved timeout. I don't see a way to query this in the dictionary.
2) I seems the you don't need to do a "tsNetInit" in the IDE. In the IDE one gets "tsneterr: Already initialized". On Android this error does not occur.
Ralph DiMola
IT Director
Evergreen Information Services
rdimola at evergreeninfo.net
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