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Re: [Bug-wget] [GSoC Proposal] Python3-based FTP Server for Test Suit an

From: Darshit Shah
Subject: Re: [Bug-wget] [GSoC Proposal] Python3-based FTP Server for Test Suit and Test Suit Refactoring
Date: Fri, 7 Mar 2014 15:17:26 +0100

Hi Zihang,

The proposal seems good.

On Fri, Mar 7, 2014 at 11:39 AM, 陈子杭 (Zihang Chen) <address@hidden>wrote:

> * this is only a draft, so it's not written according to the GNU GSoC
> template. When discussion is done, I'll get a formal one done (with
> schedule etc.) *
> Briefing
> ====
> As is known, a new Python3-based test suite was implemented to replace the
> old one. And a configurable HTTP server utilizing `http.server` and
> `http.BaseHTTPRequestHandler` was also implemented. Thus the HTTP server
> can be configured to respond certain headers according to the configuration
> in separate test cases.
> However, a configurable FTP server was not required to be implemented,
> which breaks the consistency of the test suite of wget. So it's necessary
> that a configurable FTP server be built.
> Initial Design
> ====
> The test suite consists of two parts: `WgetTest.py` (module that actually
> runs the tests), servers (configurable HTTP and FTP server). When running
> test cases, `HTTPTest` instances collect configurations from test cases and
> start the servers with them so that the HTTP handler will handle the
> incoming requests according to the configurations (also known as rules).
> About the FTP server, I think the handler architecture can be applied here:
> implement multiple handlers corresponding to the FTP commands and register
> them in server instances automatically. When registering handlers, the
> server should also inform the handlers about the configurations. When new
> FTP command arrives, the server invoke the corresponding handler, and then
> the handler look up the rules itself and do the expected actions. When
> doing real FTP actions, I intend to use third-party FTP library like the
> current FTP server (I fear sockets so best not directly touch them).
> There's two things that are unclear:
> * the necessity of implementing all the FTP command. I presume that wget
> wouldn't utilize all of them.
If you're using a library, e.g. pyftpdlib, I don't see why you'd have to
any commands on your own.  Simply use the library for it.

> * what will the configurations be, do I need to design the tests myself? Or
> should I also port the Perl scripts to Python3?
Porting the existing Perl tests should give you a good idea of the various
configurations that will be needed. Looking up the Wget source is also often
a good idea. Either ways, some of us can help out with identifying and
test cases when the time comes.

> Test Suite Refactoring
> ====
> While reading source, I don't find the test suite pythonic. Multiple parts
> of it seems unmaintainable. If the test suite can be refactored into a
> better coded one,  maintainability can further be achieved.
> Yes. I agree the current python based test suite might advantage from a
few refactorings. There are a few places where the test suite is quite
and fixing those would be a nice idea.

Examples of unpythonicness:
> * docstrings out of classes or methods
> * mutable objects as default argument values
> * multiple use of operator is (controversial)
> * writing `_replace_substring (WgetTest.py:119)` instead of utilizing the
> format specification mini-language
> Examples of unmaintainability:
> * referencing attributes which are defined in subclasses (`WgetTest.py:61`
> references `self.servers` which is defined in its subclass
> `WgetTest.py:254`)
> * inappropriate variable names (in `WgetTest.py:254` `self.servers`
> actually becomes an integer while it regarded normally as a list of
> servers)
Yes, the variable names are horrible aren't they? That should be
refactored. (Shouldn't
take much time ).

> * no intuitive, self-declarative module hierarchy
The module hierarchy is slightly complicated. Making it more intuitive
would help.

> About me
> ====
> My name's Zihang Chen. I'm a 3rd undergraduate student from China
> (timezone: UTC+8). Please forgive me for any mistaken uses of the English
> language. I have been using Python for 3 years. I mostly code for myself
> (assignment, interest etc.) Never worked for any open source organizations
> before, so I'm thrilled to apply for GSoC. You can visit my GitHub
> page here<https://github.com/mad4alcohol>
> .
> Looking forward to your comments. Thanks very much.

Thanking You,
Darshit Shah

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