Re: pl-web, almost a web development framework
Hi guys!
This time I've also attached the sample web app. You know where things
are to be and how to start the http server if you read the prior post.
So pl-web is getting more feature complete, we can now also:
1.) Upload files, in the test application they end up in the
app/uploads folder in the sample web app ( http://localhost:8080/login
).
2.) Redirect, go to http://localhost:8080/to-whoami to see it in effect.
3.) Download / load mime files, try
http://localhost:8080/public/test.html and
http://localhost:8080/public/test.txt
In addition to that sessions will now get wiped (if it works correctly
which I think but I'm not 100), in the main.l of the simple web app
you have the following at the top: (setq *SClI '(3600 . 5)) (Session
Clear Information) which means it should remove sessions that are
older than one hour and there's a 5% chance of the "swipe" being
initiated everytime someone accesses the site. Depending on how busy
the site is and how accurately you want to be able to remove old
sessions these values should be changed. I know, it's ugly but it's
what I can come up with.
We now have something like the PL equivalent of the environment /
capabilities you have when you start out with an empty PHP script.
If you inspect the code you will see that in addition to the http
function a few others have been redefined, I have removed basically
everything from _htSet and have no idea if now something essential is
missing or if it was just stuff pertaining to the GUI framework. It's
a monkey in a spaceship situation here, I suppose I'll find out soon
enough as my intention is to now go ahead and create some kind of
framework on top of pl-web.
I've also modified Alex JSON code and included it in pl-web. The
following now looks like it works (didn't try to eval with JS but
visually it looks good):
(class +Person)
(dm T (Name Age)
(=: nm Name)
(=: age Age))
(setq Anna (new '(+Person) "Anna" 25))
(setq Peter (new '(+Person) "Peter" 30))
(printJson
(list
(list "two-people" "[]" Anna Peter)
'("name" . "Smith")
'("age" . 25)
'("a-bool" . T)
'("some-bools" "[]" T NIL T T T NIL NIL)
'("address"
("street" . "21 2nd Street")
("city" . "New York")
("state" . "NY")
("zip" . "10021") )
'("phone" "[]" "212 555-1234" "646 555-4567") ) )
I think comments on the above are superfluous. I never managed to
flip/reverse the pairs so that mapcar over the getl is the result of
that inability.
Anyway, it now basically works like I want.
On Sat, Jan 28, 2012 at 4:25 PM, Henrik Sarvell <hsarvell@...> wrote:
>
> OK so I've got a first draft of something simple.
>
> As opposed to what has been requested before this is NOT a web
> development framework in the sense of RoR or even Ring.
>
> Instead I've opted to create a simple environment from which
> frameworks utilizing conventions and such can be built, both a RoR
> type of thing or a simpler Ring style framework is possible to create
> from pl-web.
>
> What we have is a few basic things:
>
> 1.) An ability to inspect the current look of the URL (se line 87 and
> 120 in pl-web.l).
>
> 2.) File based sessions (ugly yes but will not make demands on how any
> database should look like). See line 109 in pl-web.l.
>
> 3.) Trying as hard as we can to utilize Linux system
> functions/commands in order to alleviate the need for libraries (see
> cmd.l).
>
> How to test:
>
> 1.) Unpack the attached file into /opt/picolisp and create
> /tmp/pl-web/sessions/.
>
> 2.) Create a folder called simple-web-app in /opt/picolisp/projects
> and paste the following into a main.l file there:
>
> (load
> "pl-web/pl-web.l"
> "pl-web/pl-html.l")
>
> (de login (Msg)
> (<plw-form> NIL ""
> (<span> NIL "Username:")
> (<plw-field> "text" "username" (gReq "username"))
> (<br>)
> (<span> NIL "Password:")
> (<plw-field> "password" "password" "")
> (<br>)
> (<submit> "Submit")
> (<br>)
> (<span> NIL Msg) ) )
>
> (de app ()
> (fatApp
> (html 0 "PL Web" *Css NIL
> (<div> NIL (println "Post: " *Post " Cookies: " *Cookies))
> (cond
> ((= (car *Urll) "login")
> (ifn (and (= (gReq "password") "test") (= (gReq
> "username") "test"))
> (login (if (gReq "username")
> "User not found."
> "Please login." ) )
> (sSess 'logged-in-user "test")
> (<div> NIL "Login successful.") ) )
> ((= (car *Urll) "whoami")
> (<div> NIL (prin "You are: " (gSess 'logged-in-user))) )
> (T ("Nothing to do.")) ) ) ) )
>
> (de start ()
> (off *JS))
>
> (de go ()
> (server 8080 "!start") )
>
> 3.) Start it: henrik <at> henrik-laptop:/opt/picolisp$ ./pil
> projects/simple-web-app/main.l -go
>
> 4.) Browse to: http://localhost:8080/login and submit the form with
> test in both fields.
>
> 5.) Browse to: http://localhost:8080/whoami
>
> That's it, I think inspection of the code plus testing in #4 and #5
> above should be enough to understand how this works.
>
> A few TODO/Thoughts:
>
> 1.) Swiping stale sessions in the sessions folder. Some kind of
> timeout value might be needed, if combined with a random initializer
> we have recreated the ugliness of PHP session handling to perfection.
>
> 2.) Port of the current xhtml.l library (which we are currently
> relying heavily on), as can be seen I've started a little in the
> pl-html.l file, all that *JS stuff etc needs to go.
>
> 3.) Some brave soul needs to create a real, clever, framework from
> this that is beautiful enough that it might get some attention. What
> was that earlier suggestion, Bumblebee? Don't know about the name
> though as it brings to mind something that looks so heavy it should
> not be able to fly, yet does. Perhaps not something we want associated
> with PicoLisp.
>
> 4.) If it would be possible for PL to have several databases open at
> the same time (I have a vague memory of discussing this at some point
> in the past) stuff like session handling could done through a DB
> instead and without making demands on the main application E/R.
>
> Comments?
>
> /Henrik Sarvell
/Jon
RSS Feed