Rev cgi question

Richard Miller wow at together.net
Wed Apr 9 11:00:38 CDT 2008


Thanks Andre. I think I understand and will give it a try.
Richard


On Apr 9, 2008, at 11:42 AM, Andre Garzia wrote:

> Richard,
>
> thats not the way to do it. Most browsers will timeout if you try to
> work like that. The idea is to send back a page with a <META REFRESH>
> tag in it, this tag allows you to put a time trigger in the page that
> will redirect the page to some other url in a given time.
>
> So what you do is you keep redirecting to a cgi that checks the
> process and answer with the current status.
>
> Take notice that the cgi will close the connection, so when the new
> request to the status cgi (or the same cgi, whichever you choose)
> fires, it must have some way to detect that the request is being
> processed somehow. One way to do it is to use a database to store
> statuses or to use plain text files, when the cgi launches it checks
> these records to see in which step it is.
>
> suppose your task should take between 5 and 10 seconds and it all
> handled by a file called pumba.cgi and the current status is managed
> by a text file called pumba.txt, this text file can be a number
> between 1 and 100 denoting the percentage value of the task. So you go
> like this?
>
> Step #1: Client browser calls pumba CGI.
> Step #2: Pumba.cgi checks for pumba.txt, if not found go to step #3,
> if found go step #4.
> Step #3: put 0 into pumba.txt and start working, each time a new
> milestone is reached in the task, increment the value in pumba.txt
> till it reaches 100 when the task is completed. Redirect browser to
> step #2.
> Step #4: check the value in pumba.txt, if below 100, display a
> progress bar with value. and redirect in 2 seconds to step #2. if the
> value is 100 go step #5.
> Step #5: show feedback on task completed and delete pumba.txt
>
> This is a simple workflow that works for a single user, you need
> something more robust for multiple users.
>
> Cheers
> andre
>
>
> On Wed, Apr 9, 2008 at 12:26 PM, Richard Miller <wow at together.net>  
> wrote:
>> The last line of a typical Rev cgi script is often something like  
>> "put
>> buffer", where the data is sent back to the user. Is it possible  
>> to wait,
>> say, 5 seconds after that, then use another "put buffer" command  
>> to send
>> back another page of data?
>>
>> What I'm trying to do is have the user press Submit, see an  
>> intermediary
>> page come up right away (such as "Processing your request"), then  
>> have the
>> final results show up several seconds later.
>>
>> Will this work?
>>
>> Thanks.
>> Richard Miller
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>
>
>
> -- 
> http://www.andregarzia.com All We Do Is Code.
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