[Q] Conditional streaming of file upload

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[Q] Conditional streaming of file upload

Chun, Sungjin
Hi,

What I'm trying to do is that if some parameter ex.) "sessionid" is valid
then file upload session will be continued, if not, the current session will be
cancelled. What part should I put session checking code?

My current code is

answerTo: aHTTPRequest
        | stream sidStream |
        aHTTPRequest
                postDataAt: 'file'
                beforeStreamingDo: [:datum |
                        stream _ (SpFilename named: (self localNameFor: datum filename)) writeStream.
                        datum writeStream: stream].

        aHTTPRequest
                postDataAt: 'sessionid'
                beforeStreamingDo: [:datum |
                        sidStream _ WriteStream on: (ByteArray new: 1000).
                        datum writeStream: sidStream].

        aHTTPRequest ensureFullRead. "to be sure streaming occurs"
        stream close. "mandatory, to close open stream! "

        Transcript show: sidStream contents asString; cr.
        sidStream close.

        ^HTTPResponse ok
                entity: 'OK'

It seems that only after all streaming is done, the sessionid value is readable.

Thanks in advance.
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Re: [Q] Conditional streaming of file upload

Janko Mivšek
S.J.Chun wrote:

> What I'm trying to do is that if some parameter ex.) "sessionid" is valid
> then file upload session will be continued, if not, the current session will be
> cancelled. What part should I put session checking code?

Before file input field. That way you'll have a value read and parsed
from request before reading/streaming the actual file starts.

Input field order is therefore important. You need to put all input
fields (whose values you'll need later for streaming) before the
streamed input fields.

Note also that not only file uploads but any post data can be streamed.
If you look at the code it is actually already streamed internally just
to the temporary stream. To stream some other form input, simply use the
same method #postDataAt:beforeStreamingDo: for that form element too.

Best regards
Janko

>
> My current code is
>
> answerTo: aHTTPRequest
> | stream sidStream |
> aHTTPRequest
> postDataAt: 'file'
> beforeStreamingDo: [:datum |
> stream _ (SpFilename named: (self localNameFor: datum filename)) writeStream.
> datum writeStream: stream].
>
> aHTTPRequest
> postDataAt: 'sessionid'
> beforeStreamingDo: [:datum |
> sidStream _ WriteStream on: (ByteArray new: 1000).
> datum writeStream: sidStream].
>
> aHTTPRequest ensureFullRead. "to be sure streaming occurs"
> stream close. "mandatory, to close open stream! "
>
> Transcript show: sidStream contents asString; cr.
> sidStream close.
>
> ^HTTPResponse ok
> entity: 'OK'
>
> It seems that only after all streaming is done, the sessionid value is readable.
>
> Thanks in advance.
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--
Janko Mivšek
AIDA/Web
Smalltalk Web Application Server
http://www.aidaweb.si

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Re: [Q] Conditional streaming of file upload

Randal L. Schwartz
>>>>> "Janko" == Janko Mivšek <[hidden email]> writes:

Janko> Input field order is therefore important. You need to put all input
Janko> fields (whose values you'll need later for streaming) before the
Janko> streamed input fields.

Input field order is not guaranteed in the CGI (draft) spec though.  A
conforming client is free to send out the fields in alphabetical or random
order, for example.  There's no "before" that can be guaranteed.

You'd have to do this as two steps.  The submit button could fire AJAX that
says "the stream's a'comin'!"... and then after a server confirmation, submit
the stream form.

--
Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
<[hidden email]> <URL:http://www.stonehenge.com/merlyn/>
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Re: [Q] Conditional streaming of file upload

Chun, Sungjin
In reply to this post by Chun, Sungjin
Hi,

I cannot read other input field value; for example to read sessionid, I've written following code
but it does print "nil".

answerTo: aHTTPRequest
        aHTTPRequest
                postDataAt: 'sessionid'
                beforeStreamingDo: [:datum |
                Transcript show: datum value; cr.
        ].


I though the value of 'sessionid' will be printed on Transcript window. What's wrong?

Thanks in advance.

----- Original Message -----
   From: Janko Mivšek <[hidden email]>
   To: "S.J.Chun" <[hidden email]>, Swazoo Development Discussions <[hidden email]>
   Sent: 08-07-31 00:24:04
   Subject: Re: [Swazoo-devel] [Q] Conditional streaming of file upload

  S.J.Chun wrote:

> What I'm trying to do is that if some parameter ex.) "sessionid" is valid
> then file upload session will be continued, if not, the current session will be
> cancelled. What part should I put session checking code?

Before file input field. That way you'll have a value read and parsed
from request before reading/streaming the actual file starts.

Input field order is therefore important. You need to put all input
fields (whose values you'll need later for streaming) before the
streamed input fields.

Note also that not only file uploads but any post data can be streamed.
If you look at the code it is actually already streamed internally just
to the temporary stream. To stream some other form input, simply use the
same method #postDataAt:beforeStreamingDo: for that form element too.

Best regards
Janko

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Re: [Q] Conditional streaming of file upload

Chun, Sungjin
In reply to this post by Chun, Sungjin
Hmm,

it seems that I cannot read value of parameter until  ensureFullRead is done. The
problem is that I cannot disconnect or return error message until all file uploading
is finished.

How can I read a value during stream parsing? For example, if "sessionid" is first field and
"file" is second field, then I can read "sessionid" first. And if read-in "sessionid" is wrong,
I just want to reply with string 'NO'. How can I acheive this?

Thank you in advance.

----- Original Message -----
   From: "S.J.Chun" <[hidden email]>
   To: Swazoo Development Discussions <[hidden email]>, Janko Mivšek <[hidden email]>
   Sent: 08-07-31 12:23:17
   Subject: Re: [Swazoo-devel] [Q] Conditional streaming of file upload

  Hi,

I cannot read other input field value; for example to read sessionid, I've written following code
but it does print "nil".

answerTo: aHTTPRequest
        aHTTPRequest
                postDataAt: 'sessionid'
                beforeStreamingDo: [:datum |
                Transcript show: datum value; cr.
        ].


I though the value of 'sessionid' will be printed on Transcript window. What's wrong?

Thanks in advance.

----- Original Message -----
   From: Janko Mivšek <[hidden email]>
   To: "S.J.Chun" <[hidden email]>, Swazoo Development Discussions <[hidden email]>
   Sent: 08-07-31 00:24:04
   Subject: Re: [Swazoo-devel] [Q] Conditional streaming of file upload

  S.J.Chun wrote:

> What I'm trying to do is that if some parameter ex.) "sessionid" is valid
> then file upload session will be continued, if not, the current session will be
> cancelled. What part should I put session checking code?

Before file input field. That way you'll have a value read and parsed
from request before reading/streaming the actual file starts.

Input field order is therefore important. You need to put all input
fields (whose values you'll need later for streaming) before the
streamed input fields.

Note also that not only file uploads but any post data can be streamed.
If you look at the code it is actually already streamed internally just
to the temporary stream. To stream some other form input, simply use the
same method #postDataAt:beforeStreamingDo: for that form element too.

Best regards
Janko

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