I've created a web app in Python 3. It all runs beautifully until I have to upload a file... There's no way to find the path or the file in the environment. I am using wsgi and I am thinking of migrating to another web server, what are your recommendations?
This is all what I receive from the
s = FileWrapper(environ.copy()['wsgi.input'])
for y in s:
print(y)
And the response of that is:
b'-----------------------------1514423166515917395188753897--\\r\\n'
What does this mean?
That's the file data, sent in a format guaranteed to survive to the destination, which is you. You need to decode it, and there are libraries for doing this in Python.
However, since you clearly don't know how these kinds of technical details work in the Web, if you want to write your own webserver you will have to learn. And it's not a trivial question.
I suggest you use some sort of web framework. There are tons of them for Python, I would recommend Pyramid or Django, both which now are ported to Python 3.
Related
I've written an AIML file for a chat bot and I'd like to build an interactive web application which allows me to chat with the bot in the web browser.
Is it possible to achieve this with HTML & Javascript?
There is no short answer on how to write a web application which allows a user to interact with your AIML. Writing such an application from scratch will be much more work then compiling the AIML was.
The easiest option would be to use a pre-built service like PandoraBots which allows you to upload AIML files and interact with them in the web browser. It's free to use the explorer part of website. They also have paid developer options which generates an API to bridge your AIML script and any applications you might want to build. It can be easily connected to work with common chat apps like Google talk ect.
If you decide to build everything from scratch you might want to check out the AIML Interpreter library for nodejs.
UPDATE: Here is a node.js based interpreter that you might find useful https://github.com/mrchimp/surly2
I was looking at AIML too and had similar questions. I just found RiveScript RiveScript and it looks like it fits your need to run javascript based on a match. It is not AIML, but very close. There is also at least one tool to convert from AIML to RiveScript, so I would say this fits your needs within those constraints.
I'm really new to programming, and I wonder how simple mobile game servers (like flappy bird) are built to store the scores that user made.
If you are new to programming maybe instead of programming your own backend engine is better to use some APIs developed by third party developers. Some examples are on Parse, App42 or Gamedonia. This APIs allows to save data easily and to not have to build your own servers.
The three things you need to know how to do:
Write a program that talks to another program over the internet
Write a program that talks to a database on the local machine
Start a virtual server instance on a service such as AWS and run stuff on it
For a beginner, NodeJS and MongoDB are particularly easy to do this with.
Later it might be a better idea to use an already-made API like Unai mentions, but trying this out yourself first will give you a better understanding of how this all works.
You can also use Facebook scores API for that (how to integrate in unity3d).
Our app is a sort-of self-service website builder for a particular industry. We need to be able to store the HTML and image files for each customer's site so that users can easily access and edit them. I'd really like to be able to store the files on S3, but potentially other places like Box.net, Google Docs, Dropbox, and Rackspace Cloud Files.
It would be easiest if there there some common file system API that I could use over these repositories, but unfortunately everything is proprietary. So I've got to implement something. FTP or SFTP is the obvious choice, but it's a lot of work. WebDAV will also be a pain.
Our server-side code is Java.
Please someone give me a magic solution which is fast, easy, standards-based, and will solve all my problems perfectly without any effort on my part. Please?
Not sure if this is exactly what you're looking for but we built http://mover.io to address this kind of thing. We currently support 13 different end points and we have a GUI interface and an API for interfacing with all these cloud storage providers.
I'd like to build a multiplayer web game application in which it supports chat. I presume the application will have to handle hundreds of simultaneous connections.
I'm planning to host my application in a shared web hosting, which has these limitations (most likely similar to PHP + Comet (long-polling) scaling / hosts):
It does not seem I can change the web server. Most likely it's using Apache.
Supports MySQL 5, PHP 5.3.x, Perl, Python, Ruby on Rails, CGI
(To be more precise, I'll be using HawkHost's shared web hosting.)
And here are my result of research, followed by my questions:
Some resources (like Python Comet Server) say that PHP is not good for handling concurrent connections, while Python is better choice. Is this true?
I've tried the long polling technique in PHP (although I don't know whether it's correctly implemented or not, like Comet issue with abandoned open connections) using "Loop endlessly until the data changes." method. This almost works. The remaining problem is that the server process never dies when the browser is closed (the server does not know that the connection has been terminated, and the data never changes). Is there any way the PHP can detect whether the browser has been terminated so that it stops the loop?
I've been looking everywhere to look for answers but still I can't conclude anything. This topic has also been asked on StackOverflow so many times, I'm sorry if I may sound repeating >.<.
Currently I am able to code using PHP, MySQL, and JQuery for JS. I'm still new to the term Comet and Server Push. If necessary, I'm also willing to learn new scripting language like Python.
I appreciate any insights of what scripting language, framework, and techniques to use to start my project.
When you have a shared hosting environment and there are a number of restrictions enforced then it's a good idea to outsource the realtime functionality. I would say this since I work for one such company, Pusher. But I hope others will back me up on this.
When using a hosted solution you can push a notification by making a HTTP request to a RESTful API. The service will then deliver the message to the connected Web Client (browser). The browser does need to include a script tag or use a library that also connects to the hosted service.
The main benefits are:
No installation or maintenance
No need to handle persistent connections - no resource usage
Really simple usage: Script tag in app and call REST API
The hosted solution handles scaling
Also, here's a list of hosted realtime solutions.
So you can use Python. Then you can use Tornado. (psst... facebook uses it)
And I had same problem with open connections. Just don't spend time for search solution in PHP - later you will be sorry. I was. Just use what is made for Comet. If you more prefere JAVA, then there is: CometD.
And for game get a normal hosting. They cheap this days.
We have a library with very complex logic implemented in C. It has a command line interface with not too complex string-based arguments. In order to access this, we would like to wrap the library so that it can be accessed with simple XML RPC or even straightforward HTTP POST calls.
Having some experience with Java, my first idea would be
Wrap the library in JNI/JNA
Use a thin WS stack and a servlet engine
Proxy requests through Apache to the servlet engine
I believe there should already be something simple that could be used, so I am posting this question here. A solution has the following requirements
It should be deployable to a current linux distribution, preferrably already available via package management
It should integrate with a standard web server (as in my example Apache)
Small changes to the library's interface should be manageable
End-to-end (HTTP-WS-library-WS-HTTP) the solution should not incur too much overhead, but reliability is very important
Alternatively to the JNI/JNA proposal, I think in the C# world it should not be too difficult to write a web service and call this unmanaged code module, but I hope someone can give me some pointers that are feasible in regards to the requirements.
If you're going with web services, perhaps Soaplab would be useful. It's basically a tool to wrap existing command line applications in SOAP web services. The web services it generates look a bit weird but it is quite a popular way to make something like this work.
Creating an apache module is quite easy and since your familiar with xmlrpc you should check out mod-xmlrpc2. You can easily add your C code to this apache module and have a running xmlrpc server in minutes
I think you may also publish it as a SOAP based web service. gSoap can be used to provide the service interface out of the library. Have you explored gSOAP? See http://www.cs.fsu.edu/~engelen/soap.html
Regards,
Kangkan
Depends what technology you're comfortable with, what you already have installed and working on your servers, and what your load requirements are.
How about raw CGI? Assuming the C code is stateless between requests, you can do this without modifying the library at all. Write a simple script which pulls the request parameters out of the CGI environment, perhaps sanitises the input, calls the library via the command-line interface, and packages the result into whatever HTTP response you want. Then configure Apache to dispatch the relevant URL(s) to this script. Python, for example, has library support for XML-RPC, and so does every other scripting language used on the web.
Servlets sound like overkill, but for instance if you want multiple requests per CGI process instantiation, and don't feel like getting involved in Apache configuration, then it might be easiest to stick with what you know.
I'm doing a similar thing with C++ at the moment. In my case, I'm writing a PHP module to allow PHP scripts to access the logic in my C++ library.
I can then use whatever format I want to allow the rest of the world to see it - initially it will just be through a PHP web application but I'll also be developing an XML-RPC interface.
If you're going down the JNI route, check out SWIG.
http://www.swig.org/Doc1.3/Java.html
Assuming you have headers to project bindings with, swig is pretty easy to work with.