mirror of
https://github.com/lunarmodules/luasocket.git
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317 lines
9.8 KiB
HTML
317 lines
9.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>LuaSocket: Network support for the Lua language </title>
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<link rel="stylesheet" href="reference.css" type="text/css">
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</head>
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<body>
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<!-- header +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<div class=header>
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<hr>
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<center>
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<table summary="LuaSocket logo">
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<tr><td align=center><a href="http://www.lua.org">
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<img width=128 border=0 alt="LuaSocket" src="luasocket.png">
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</a></td></tr>
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<tr><td align=center valign=top>Network support for the Lua language
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</td></tr>
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</table>
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<p class=bar>
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<a href="home.html">home</a> ·
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<a href="home.html#download">download</a> ·
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<a href="introduction.html">introduction</a> ·
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<a href="reference.html">reference</a>
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</p>
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</center>
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<hr>
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</div>
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<!-- whatis +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<h2 id=whatis>What is LuaSocket?</h2>
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<p>
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LuaSocket is a <a href="http://www.lua.org">Lua</a> extension library
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that is composed by two parts: a C core that provides support for the TCP
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and UDP transport layers, and a set of Lua modules that add support for
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functionality commonly needed by applications that deal with the Internet.
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</p>
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<p>
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The core support has been implemented so that it is both efficient and
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simple to use. The core can be used by any Lua application once it has
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been properly initialized by the interpreter running the
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Lua application. The code has been tested and runs well on several Windows
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and Unix platforms.
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</p>
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<p>
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The most used modules implement the
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<a href=smtp.html>SMTP</a>
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(sending e-mails),
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<a href=http.html>HTTP</a>
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(WWW access) and
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<a href=ftp.html>FTP</a>
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(uploading and downloading files) client
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protocols. These provide a very natural and generic interface to the e
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functionality covered by the protocols.
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In addition, you will find that the
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<a href=mime.html>MIME</a> (common encodings),
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<a href=url.html>URL</a>
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(anything you could possible want to do with one) and
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<a href=ltn12.html>LTN12</a>
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(filters, sinks, sources and pumps) modules can be very handy.
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</p>
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<p>
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The library is available under the same
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<a href="http://www.lua.org/copyright.html">
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terms and conditions</a> as the Lua language, the MIT license. The idea is
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that if you can use Lua in a project, you should also be able to use
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LuaSocket.
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</p>
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<p>
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Copyright © 1999-2004 Tecgraf/PUC-Rio. All rights reserved. <br>
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Author: <A href="http://www.cs.princeton.edu/~diego">Diego Nehab</a>
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</p>
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<!-- download +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<h2 id=download>Download</h2>
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<p>
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LuaSocket version 2.0 beta is now available for download! It is
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compatible with Lua 5.0 and has been tested on
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Windows XP, Linux, and Mac OS X.
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</p>
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<p>
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The library can be downloaded in source code from the following links:
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</p>
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<blockquote>
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<p>
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<a href="luasocket-2.0-beta.tar.gz">luasocket-2.0-beta.tar.gz</a> <br>
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<a href="luasocket-2.0-beta.zip">luasocket-2.0-beta.zip</a>
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</p>
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</blockquote>
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<p>
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Besides the full C and Lua source code for the library, the distribution
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contains several examples, this user's manual and the test procedures.
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</p>
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<p>
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I am also providing PC Win32 binaries for those that want to give
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LuaSocket a quick try:
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</p>
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<blockquote>
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<p>
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<a href="luasocket-2.0-beta-win32.zip">luasocket-2.0-beta-win32.zip</a>
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</p>
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</blockquote>
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<p>
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The quick and dirty way to use these binaries is to unpack everything into a
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directory, say <tt>c:\luasocket</tt> (include all Lua files from the
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LuaSocket distrbitution in the same directory too!).
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Then set <tt>LUA_INIT</tt> to load the <tt>lua.lua</tt> helper file:
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</p>
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<pre class=example>
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c:\luasocket\> set LUA_INIT=@lua.lua
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</pre>
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<p>
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From that directory, you can then run the interpreter and it should find all
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files it needs. To download this manual page from the Internet, for example,
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do the following:
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</p>
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<pre class=example>
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c:\luasocket\> lua
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Lua 5.0.2 Copyright (C) 1994-2004 Tecgraf, PUC-Rio
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> http = require"http"
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> print(http.request"http://www.tecgraf.puc-rio.br/luasocket/")
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--> this file
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</pre>
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<!-- thanks +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<h2 id=thanks>Special thanks</h2>
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<p>
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Throughout LuaSocket's history, many people gave suggestions that helped
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improve it. For that, I thank the Lua community.
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Special thanks go to
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David Burgess, who has helped push the library to a new level of quality and
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from whom I have learned a lot of stuff that doesn't show up in RFCs.
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Special thanks also to Carlos Cassino, who played a big part in the
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extensible design seen in the C core of LuaSocket 2.0.
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</p>
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<!-- whatsnew +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<h2 id=new>What's New</h2>
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<p>
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<em>Everything</em> is new! Many changes for 2.0 happened in the C layer,
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which has been almost completely rewritten. The code has been ported to
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Lua 5.0 and greatly improved. There have also been some API changes
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that made the interface simpler and more consistent. Here are some of
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the changes that made it into version 2.0:
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</p>
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<ul>
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<li> Major C code rewrite. Code is modular and extensible. Hopefully, other
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developers will be motivated to provide code for SSL, local domain
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sockets, file descriptors, pipes (on Unix) and named pipes etc;
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<li> Everything that is exported by the library is exported inside
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namespaces. These should be obtained with calls to the
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<tt>require</tt> function;
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<li> Functions such as
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send/receive/timeout/close etc do not exist anymore as stand-alone
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functions. They are now only available as methods of the appropriate
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objects;
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<li> All functions return a non-nil value as first return value if successful.
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All functions return <b><tt>nil</tt></b> followed by error message
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in case of error. This made the library much easier to use;
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<li> Greatly reduced the number of times the C select is called
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during data transfers, by calling only on failure. This might
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improve a lot the maximum throughput;
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<li> TCP has been changed to become more uniform. It's possible to first
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create a TCP object,
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then connect or bind if needed, and finally use I/O functions.
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<tt>socket.connect</tt> and <tt>socket.bind</tt> functions are still
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provided for simplicity;
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<li> This allows for setting a timeout value before connecting;
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<li> And also allows binding to a local address before connecting;
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<li> New <tt>socket.dns.gethostname</tt> function and <tt>shutdown</tt>
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method;
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<li> Better error messages and parameter checking;
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<li> Should be interrupt safe;
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<li> UDP connected sockets can break association with peer by calling
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<tt>setpeername</tt> with address '<tt>*</tt>';
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<li> Sets returned by <tt>socket.select</tt> are associative;
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<li> Select checks if sockets have buffered data and returns immediately;
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<li> <tt>socket.sleep</tt> and <tt>socket.gettime</tt> are now part of the
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library and are supported. They used to be available only when
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LUASOCKET_DEBUG was defined, but it turns out they might be useful for
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applications;
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<li> <tt>socket.try</tt> and <tt>socket.protect</tt> provide a simple
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interface to exceptions that proved very in the implementation of
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high-level modules;
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<li> Socket options interface has been improved. TCP objects also
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support socket options and many new options were added.
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</ul>
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<p>
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Lots of changes in the Lua modules, too!
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</p>
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<ul>
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<li> Every module loads only the modules that it needs. There is no waste
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of memory. LuaSocket core takes only 20k of memory;
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<li> New MIME and LTN12 modules make all other modules much more powerful;
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<li> Support for multipart messages in the SMTP module;
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<li> The old callback mechanism of FTP and HTTP has been replaced with LTN12 sources and sinks, with advantage;
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<li> Common implementation for low-level FTP and SMTP;
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<li> FTP, HTTP, and SMTP are implemented in multiple levels in such a way
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that users will have no problems extending the functionality to satisfy
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personal needs;
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<li> SMTP knows how to perform LOGIN and PLAIN authentication.
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</ul>
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<!-- incompatible +++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<h3 id=incompatible>Incompatibilities with previous versions</h3>
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<ul>
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<li> The introduction of namespaces affects all programs that use LuaSocket,
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specially code that relies on global functions. These are no longer
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available. Note that even the support modules (<tt>http</tt>, <tt>smtp</tt>
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etc) are independent now and should be "<tt>require</tt>"d;
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<li> FTP, SMTP and HTTP are completely new; I am sure you will
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agree the new stuff is better;
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<li> WARNING: The new <tt>send</tt>, <tt><b>receive</b></tt>,
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<tt>sendto</tt>, <tt>setpeername</tt> and <tt>setsockname</tt>,
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return convention WILL break old code;
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<li> To enable local binding before connect, the <tt>bind</tt> method
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does not call <tt>listen</tt> anymore. It is the new <tt>listen</tt>
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method that turns a TCP object into a server object;
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<li> <tt>socket.time</tt> became <tt>socket.gettime</tt> for uniformity;
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<li> Interface to options has changed.
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</ul>
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<!-- old ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<h2 id=old>Old Versions</h2>
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<p>
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All previous versions of the LuaSocket library can be downloaded
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<a href="http://www.tecgraf.puc-rio.br/luasocket/old">here</a>. Although
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these versions are no longer supported, they are still available for
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those that have compatibility issues.
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</p>
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<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<div class=footer>
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<hr>
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<center>
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<p class=bar>
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<a href="home.html#down">download</a> ·
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<a href="introduction.html">introduction</a> ·
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<a href="reference.html">reference</a>
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</p>
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<p>
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<small>
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Last modified by Diego Nehab on <br>
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Thu Jun 17 02:47:14 EDT 2004
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</small>
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</p>
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</center>
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</div>
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</body>
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</html>
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