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Skylark reaching "beta" status, first 6 chapters of tutorial available.. [message #36800]

Fri, 06 July 2012 17:13

mirek is currently offline

mirek
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...here:

http://www.ultimatepp.org/srcdoc$Skylark$Tutorial$en-us.html

(more to come, I have yet to cover sessions, Ajax support and SQL).

I would also like to ask for help with "deployment" documentation - Skylark now works as console program that serves HTTP and SCGI requests. I guess the most common deployment would be to connect it to Apache through SCGI and use start-stop-daemon, provide some /etc/init.d script etc... I can do documentation about the issue, but I do not feel like am the most qualified to do so...

Mirek

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Re: Skylark reaching "beta" status, first 6 chapters of tutorial available.. [message #36813 is a reply to message #36800]

Sun, 08 July 2012 15:50

dolik.rce is currently offline

dolik.rce
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dolik.rce@gmail.com

Hi Mirek,

Great work, the tutorials almost made me want to write a web-app Smile

Smile

However, I found a little problem... Out of curiosity, I tried to run ab (Apache Benchmark) on Skylark based application, namely tutorial/Skylark04. It works great, but only sometimes. After a (variable) number of requests, the application fails with assert:

Log:

****************** ASSERT FAILED: Assertion failed in /home/h/upp-production/uppsrc/Core/String.cpp, line 38
rc->refcount > 0

LastErrorMessage: No such file or directory

Backtrace:

Upp::AssertFailed (file=0x83fdb2f "/home/h/upp-production/uppsrc/Core/String.cpp", line=38, cond=0x84016ea "rc->refcount > 0") at /home/h/upp-production/uppsrc/Core/Util.cpp:110
Upp::String0::LFree (this=0xb426bf18) at /home/h/upp-production/uppsrc/Core/String.cpp:38
Upp::String0::Free (this=0xb426bf18) at /home/h/upp-production/uppsrc/Core/String.h:226
Upp::String0::~String0 (this=0xb426bf18) at /home/h/upp-production/uppsrc/Core/String.h:303
Upp::AString<Upp::String0>::~AString (this=0xb426bf18) at /home/h/upp-production/uppsrc/Core/String.h:34
Upp::Moveable<Upp::String, Upp::AString<Upp::String0> >::~Moveable (this=0xb426bf18) at /home/h/upp-production/uppsrc/Core/Topt.h:195
Upp::String::~String (this=0xb426bf18) at /home/h/upp-production/uppsrc/Core/String.h:306
Upp::String::~String (this=0xb426bf18) at /home/h/upp-production/uppsrc/Core/String.h:306
Upp::RawHtmlText::~RawHtmlText (this=0xb426bf18) at /home/h/upp-production/uppsrc/Skylark/Witz.h:14
Upp::RawHtmlText::~RawHtmlText (this=0xb426bf18) at /home/h/upp-production/uppsrc/Skylark/Witz.h:14
Upp::RawValueRep<Upp::RawHtmlText>::~RawValueRep (this=0xb426bf10) at /home/h/upp-production/uppsrc/Core/Value.hpp:70
Upp::RawValueRep<Upp::RawHtmlText>::~RawValueRep (this=0xb426bf10) at /home/h/upp-production/uppsrc/Core/Value.hpp:70
Upp::RawValueRep<Upp::RawHtmlText>::~RawValueRep (this=0xb426bf10) at /home/h/upp-production/uppsrc/Core/Value.hpp:70
Upp::Value::Void::Release (this=0xb426bf10) at /home/h/upp-production/uppsrc/Core/Value.h:85
Upp::Value::RefRelease (this=0xb626fa68) at /home/h/upp-production/uppsrc/Core/Value.cpp:25
Upp::Value::~Value (this=0xb626fa68) at /home/h/upp-production/uppsrc/Core/Value.h:239
Upp::Value::~Value (this=0xb626fa68) at /home/h/upp-production/uppsrc/Core/Value.h:239
Upp::Compiler::ExeBlock::Eval (this=0xb41a4ef0, x=...) at /home/h/upp-production/uppsrc/Skylark/Exe.cpp:386
Upp::Render (exe=..., r=0xb62706a0, var=...) at /home/h/upp-production/uppsrc/Skylark/Exe.cpp:395
Upp::Http::RenderResult (this=0xb62706a0, template_name=0x83fbfaa "Skylark04/index") at /home/h/upp-production/uppsrc/Skylark/Http.cpp:290
HomePage (http=...) at /home/h/upp-production/tutorial/Skylark04/main.cpp:7
Upp::Http::Dispatch (this=0xb62706a0, socket=...) at /home/h/upp-production/uppsrc/Skylark/Dispatch.cpp:327
Upp::SkylarkApp::RunThread (this=0xbffff3d8) at /home/h/upp-production/uppsrc/Skylark/App.cpp:67
Upp::SkylarkApp::WorkThread (this=0xbffff3d8) at /home/h/upp-production/uppsrc/Skylark/App.cpp:32
Upp::SkylarkApp::ThreadRun (this=0xbffff3d8) at /home/h/upp-production/uppsrc/Skylark/App.cpp:37
Upp::CallbackMethodAction<Upp::SkylarkApp, void (Upp::SkylarkApp::*)()>::Execute (this=0xb7fda7a0) at /home/h/upp-production/uppsrc/Core/Callback0.h:24
Upp::Callback::Execute (this=0xb7fd81b0) at /home/h/upp-production/uppsrc/Core/Callback.cpp:7
Upp::Callback::operator() (this=0xb7fd81b0) at /home/h/upp-production/uppsrc/Core/Cbgen.h:32
Upp::sThreadRoutine (arg=0xb7fd81b0) at /home/h/upp-production/uppsrc/Core/Mt.cpp:75
start_thread () from /lib/libpthread.so.0
clone () from /lib/libc.so.6

I guess there is some concurrency issue... To reproduce, you can run

ab -n 1000 -c 20 http://127.0.0.1:8001/myapp

.

And BTW: there is a lot of DLOGs and DDUMPs scattered in the skylark code, so it is not directly compilable in release mode Wink

Wink

Best regards,
Honza

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Re: Skylark reaching "beta" status, first 6 chapters of tutorial available.. [message #36814 is a reply to message #36800]

Sun, 08 July 2012 17:48

lectus is currently offline

lectus
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This is great Mirek!

U++ is now becoming more complete!

Is this already available in latest Nightly build for testing?

[Updated on: Sun, 08 July 2012 17:55]

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Re: Skylark reaching "beta" status, first 6 chapters of tutorial available.. [message #36816 is a reply to message #36813]

Sun, 08 July 2012 20:59

mirek is currently offline

mirek
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dolik.rce wrote on Sun, 08 July 2012 09:50

Hi Mirek,

Great work, the tutorials almost made me want to write a web-app Smile

Smile

However, I found a little problem... Out of curiosity, I tried to run ab (Apache Benchmark) on Skylark based application, namely tutorial/Skylark04. It works great, but only sometimes. After a (variable) number of requests, the application fails with assert:

Should be fixed, together with three other bugs revealed by 'ab'....

Now tested with one million ab requests without failing.

Also, DLOGs removed, it should be now possible to compile release mode.

Mirek

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Re: Skylark reaching "beta" status, first 6 chapters of tutorial available.. [message #36817 is a reply to message #36814]

Sun, 08 July 2012 21:01

mirek is currently offline

mirek
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lectus wrote on Sun, 08 July 2012 11:48

This is great Mirek!

U++ is now becoming more complete!

Is this already available in latest Nightly build for testing?

Hopefully this or next night (just added Skylark to the list of uppsrc production packages).

BTW, there are two more chapters in tutorial.

Mirek

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Re: Skylark reaching "beta" status, first 6 chapters of tutorial available.. [message #36822 is a reply to message #36800]

Mon, 09 July 2012 16:03

zsolt is currently offline

zsolt
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Thanks Mirek!
Very valuable work.

One note: isn't it a security hole to get session variables using Http::operator[]? I can imagine a situation where user posts something with the name of the session variable, modifying its value.
It can be harmful if the user changes e.g. his/her user id in a web based system this way.

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Re: Skylark reaching "beta" status, first 6 chapters of tutorial available.. [message #36824 is a reply to message #36822]

Mon, 09 July 2012 19:28

mirek is currently offline

mirek
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zsolt wrote on Mon, 09 July 2012 10:03

Thanks Mirek!
Very valuable work.

One note: isn't it a security hole to get session variables using Http::operator[]? I can imagine a situation where user posts something with the name of the session variable, modifying its value.
It can be harmful if the user changes e.g. his/her user id in a web based system this way.

You have got me thinking, but fortunately this is not the case:

HTTP request values are put into shared variable space first, then the session is loaded, overwritting the same variables with session values.

Means: what is set by SessionSet cannot be changed by HTTP request.

OK, one possible issue: User could provide some value before is is created in session and it could have been mistakingly considered a session value...

Mirek

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Re: Skylark reaching "beta" status, first 6 chapters of tutorial available.. [message #36825 is a reply to message #36824]

Mon, 09 July 2012 19:43

zsolt is currently offline

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mirek wrote on Mon, 09 July 2012 19:28

OK, one possible issue: User could provide some value before is is created in session and it could have been mistakingly considered a session value...

Yes, this can be a real danger in a large project with a lot of programmers (many of them can be very sloppy).
Don't you think, it would be more safe to separate session and post variables at least based on some configuration option?

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Re: Skylark reaching "beta" status, first 6 chapters of tutorial available.. [message #36826 is a reply to message #36825]

Mon, 09 July 2012 20:42

mirek is currently offline

mirek
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zsolt wrote on Mon, 09 July 2012 13:43

mirek wrote on Mon, 09 July 2012 19:28

OK, one possible issue: User could provide some value before is is created in session and it could have been mistakingly considered a session value...

Yes, this can be a real danger in a large project with a lot of programmers (many of them can be very sloppy).
Don't you think, it would be more safe to separate session and post variables at least based on some configuration option?

Actually, I was a little bit afraid when introducing this "shared variable space", but decided to give it a try... anyway, I guess php $_REQUEST discussion applies here too (yep, cookies go there as well Smile

Smile

so we have to take some measures. Even back when introducing the operator[], the option was to differentiate by first character of id.

So http[":var"] would be session, http["@var"] cookie and http["var"] either GET or POST (I guess not need to split those, as handlers react only to GET or POST, never both). GET and POST values with ':' and '@' at the start would be explicitly disallowed (and ignored).

The reason why not simply go with some Http::GetSession is that this way, some common processing is possible (e.g. Http::Int(const char *id)).

Do you see some catch in this remake?

Mirek

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Re: Skylark reaching "beta" status, first 6 chapters of tutorial available.. [message #36827 is a reply to message #36826]

Mon, 09 July 2012 21:19

zsolt is currently offline

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It is not too beautyful, I think.

I did not learn the sources yet, but wouldn't be logical to put that operator[] and Int() functionalities into a separate class?
It could be the ancestor of Http class and the type of session and cookie members as well.

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Re: Skylark reaching "beta" status, first 6 chapters of tutorial available.. [message #36828 is a reply to message #36827]

Mon, 09 July 2012 21:44

mirek is currently offline

mirek
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zsolt wrote on Mon, 09 July 2012 15:19

It is not too beautyful, I think.

But it is not extremely ugly as well... Smile

Smile

At least you now have clear sign that you are dealing with session / cookie. And IMO still less verbose that to write http.Session("var").

Quote:

I did not learn the sources yet, but wouldn't be logical to put that operator[] and Int() functionalities into a separate class?
It could be the ancestor of Http class and the type of session and cookie members as well.

Maybe... but you also have to think about representation of these variables in witz templates. Sure, we can have "cookie("var")" and "session("var")" witz functions, but that further complicates the code and makes witz compiler optimizations a bit more difficult (not that there are many, but variable accesses are compiled to something like array index read).

Mirek

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Re: Skylark reaching "beta" status, first 6 chapters of tutorial available.. [message #36829 is a reply to message #36828]

Mon, 09 July 2012 22:42

zsolt is currently offline

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OK, it seems to be reasonable to me. Prefixes should be OK.

BTW, I feel myself very inspired to rewrite our company homepage in C++ Smile

Smile

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Re: Skylark reaching "beta" status, first 6 chapters of tutorial available.. [message #36830 is a reply to message #36829]

Mon, 09 July 2012 23:08

forlano is currently offline

forlano
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zsolt wrote on Mon, 09 July 2012 22:42

OK, it seems to be reasonable to me. Prefixes should be OK.

BTW, I feel myself very inspired to rewrite our company homepage in C++ Smile

Smile

And I too! I hope to see some CRUD facility.

Luigi

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Re: Skylark reaching "beta" status, first 6 chapters of tutorial available.. [message #36833 is a reply to message #36830]

Tue, 10 July 2012 22:08

mirek is currently offline

mirek
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Session variables now start with '.', cookie variables with '@', Skylark07 is updated to reflect this...

Mirek

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Re: Skylark reaching "beta" status, first 6 chapters of tutorial available.. [message #36949 is a reply to message #36800]

Thu, 26 July 2012 22:38

lectus is currently offline

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Just updated my U++ and tested the AddressBookWeb example on Linux and it works really well!

Congratulations and thanks to the U++ team!

Now I'll start playing with this web framework.

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Re: Skylark reaching "beta" status, first 6 chapters of tutorial available.. [message #40247 is a reply to message #36800]

Wed, 10 July 2013 16:12

Alboni is currently offline

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What is skylark and what can you use it for?
Can't figure that one out Embarassed

Embarassed

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Re: Skylark reaching "beta" status, first 6 chapters of tutorial available.. [message #40250 is a reply to message #40247]

Thu, 11 July 2013 07:52

mirek is currently offline

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Alboni wrote on Wed, 10 July 2013 10:12

What is skylark and what can you use it for?
Can't figure that one out Embarassed

Embarassed

It is web framework - something you use to create website servers.

"Normally" you use PHP, CGI, Ruby, Jango.. Skylark is C++/U++ "competition" to these.

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