CppCMS Blog http://blog.cppcms.com/ A blog on CppCMS - C++ Web Development Framework CppCMS code migrated to GitHub http://blog.cppcms.com/post/118 http://blog.cppcms.com/post/118 <div style="direction:ltr"> <p>After multiple requests and my final decision the CppCMS web framework code migrated to GitHub</p> <p><a href="https://github.com/artyom-beilis/cppcms">https://github.com/artyom-beilis/cppcms</a></p> <p>Please note:</p> <ol> <li>Only CppCMS framework migrated, other subprojects like CppDB or Wikipp are still pending conversion</li> <li>The main bug tracker is still on source-forge - however I'll relate to issues opened on GitHub</li> </ol> </div> Session Sharing with Non-CppCMS technologies http://blog.cppcms.com/post/117 http://blog.cppcms.com/post/117 <div style="direction:ltr"> <p>One of the problems in integrating different technologies on same web site is sharing the data between them, in particular sharing session data.</p> <p>For example you have a huge web platform written in PHP or Java and you want to improve performance of certain subsystems poring them to CppCMS. On of the first issues you'd encounter is how to share the session between them - so every side would know who is the user, what permissions he has, etc.</p> <p>So I made <code>cppcms::session_pool</code> and <code>cppcms::session_interface</code> accessible outside the usual request/response scope and wrapped it with <a href="http://sourceforge.net/p/cppcms/code/HEAD/tree/framework/trunk/cppcms/capi/session.h">pure C API</a> - such that no C++ exceptions are thrown and every function is resolvable via <code>dlopen</code>/<code>GetProcAddress</code>- to make it more accessible for integration with different languages.</p> <p>Several modules for different programming languages were implemented allowing smooth integration with their web frameworks and APIs:</p> <ul> <li>PHP - using <a href="http://swig.org">Swig</a></li> <li>Java/Servlet - using <a href="https://jna.java.net/javadoc/overview-summary.html">JNA</a></li> <li>Python/Django - using <a href="https://docs.python.org/2/library/ctypes.html">ctypes</a> (but not limited to Django)</li> <li>Asp.Net - using <a href="https://msdn.microsoft.com/en-us/library/aa288468%28v%3Dvs.71%29.aspx">PInvoke</a></li> </ul> <p>Actually there is no particular limits regarding technology - just a question of implementing loadable module for a specific language/platform.</p> <p>In general it consists of a SessionPool object that is created from a configuration file and exists globally. It generates a special Session objects that is loaded from Http Request cookies, updated and saved to the Http Response object.</p> <p>It looks like this:</p> <p>PHP:</p> <pre><code>// pool initialization $pool=CppCMS_SessionPool::from_config('cppcms-config.js'); // per request session access $session=$pool-&gt;session(); $session-&gt;load(); $x=0; if($session-&gt;is_set('x')) { $x=$session['x']; } $x=intval($x)+1; $session['x']=$x; $session-&gt;save(); ... </code></pre> <p>Java/Servlet:</p> <pre><code>static SessionPool pool; public void init() throws ServletException { pool = SessionPool.openFromConfig("/path/to/cppcms-config.js"); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Session session = pool.getSession(); session.load(request); String x="0"; if(session.isSet("x")) x=session.get("x"); x=Integer.toString(Integer.parseInt(x)+1); session.set("x",x); session.save(response); session.close(); ... } </code></pre> <p>Python with Django:</p> <pre><code># Create global pool pool=cppcms.SessionPool('/path/to/cppcms-config.js') # Actual view def home(request): s=pool.session() s.load(django_request=request) v='0' if 'x' in s: v= s['x'] s['x']=str(int(v)+1) response = HttpResponse() s.save(django_response=response) ... </code></pre> <p>C#/ASP.Net:</p> <pre><code>static SessionPool pool; static Example() { pool = SessionPool.FromConfig("cppcms-config.js"); } protected void Page_Load(object sender,EventArgs e) { using(Session s = pool.Session()) { s.Load(Request); string v="0"; if(s.IsSet("x")) v=s["x"]; v = (int.Parse(v) + 1).ToString(); s["x"]=v; s.Save(Response); } ... } </code></pre> <p>So basically you have a full access to CppCMS session from 3rd party most popular technologies.</p> <p>Still thinking of implementing a module for Ruby on Rails but I have never written a line of code in Ruby so it is quite challenging for me. I'll probably wait till somebody contributes one.</p> </div> Serving All Israeli News Web Sites from a Single EC2 instance... http://blog.cppcms.com/post/114 http://blog.cppcms.com/post/114 <div style="direction:ltr"> <p>For the last year the development of the CppCMS project was less active. The vast majority of the work hours were spent on a customer's project that used CppCMS to create an outstanding advertisement system.</p> <p>The project is called <a href="http://linicom.co.il">Linicom</a>.</p> <p>Today, when Linicom is up, running and maintained by a larger team, so I can resume the activity on the core CppCMS project itself.</p> <p>Few words about Linicom:</p> <p>Linicom is an engine that provides content and visitor sensitive advertisements for almost all large Israeli news web sites: including Ynet, Haaretz, Jerusalem Post, Mako, Walla and other significant web sites in Israel and abroad.</p> <p>Here some interesting facts:</p> <ul> <li>Linicom is based on CppCMS technology.</li> <li>The system serves around 10,000,000 <em>custom</em> requests a day, i.e ~115 req./s.</li> <li>During peak hours, it servers around 160 requests per second.</li> <li>Its typical network output is around 11 megabit per second.</li> <li>Its total memory consumption (web server, database, applications, OS) is only around 350Mb.</li> <li>The server's average CPU load is around 5%</li> <li>The server runs on a <code>c1.medium</code> Amazon EC2 instance.</li> </ul> <p>The system runs behind Lighttpd and uses PostgreSQL for persistent data storage. Also PostgreSQL is used extensively, all real time data is stored in memory.</p> <p>Almost every request needs data processing in order to provide highly customized advertisements. In technical terms it means that almost no request can be "outsourced" to a static files - every request for every customer should be processed explicitly.</p> <p>This system is probably one of the classic applications of CppCMS technology - web based system that required to be fast and efficient, being able to handle outstanding and sometimes unexpectedly changing loads without problems and provide high QoS.</p> <p>Use of in-memory data storage, caching and efficient handing of the data that can't be cached is were CppCMS shines. Having a big growth potential with a minimal required maintenance and high reliability allows the to handle the business-end safely without worrying about performance issues.</p> </div> CppCMS 1.0.5 Released http://blog.cppcms.com/post/116 http://blog.cppcms.com/post/116 <div style="direction:ltr"> <p>Bug Fixes:</p> <ul> <li>Fixed 121, 98 - bug caused invalid year formatting/parsing by icu backend - fixed incorrect use of year of the week instead year</li> <li>Fixed 122 - memory leak in Win32 threading library</li> <li>Fixed 105 - string_key.h has a bad operator '!='</li> <li>Fixed 119 - bad html formatting.</li> <li>Fixed 106 - IPv6 support on Winows</li> <li>Fixed 129 - cppcms_make_key - invalid option name</li> <li>Fixed 97 - impossible to use upper case in namespace in <code>&lt;% include %&gt;</code></li> <li>Fixed 84 - 64K fd limit</li> <li>Fixed 108 - test_locale_boundary &amp; booster_locale_formatting failure</li> <li>Fixed various issues libc++/clang support</li> <li>Significantly improved multipart parsing closing f.r. 27</li> <li>Removed reuse_address socket option use at Windows</li> </ul> <p>Minor Security Improvements:</p> <ul> <li>Issue 117: possibility of Timing Attack Vulnerability</li> </ul> <p>Platform Support:</p> <ul> <li>NetBSD is supported platform</li> <li>FreeBSD added support of POSIX locale &amp; clang/libc++</li> </ul> <p>The code is downloadable from sourceforge. Binary RPM releases already available at The Open Build Service repository. Debian packages would be published soon.</p> <p><strong>Update:</strong> Debian and Ubuntu packages are ready at the repository.</p> </div> CppCMS 1.0.4 Released http://blog.cppcms.com/post/115 http://blog.cppcms.com/post/115 <div style="direction:ltr"> <p>This is a critical bug fix release that relates to session handing in Internet Explorer.</p> <p>Added "Expires" to cookie expiration time handling that is supported by IE.</p> <p>Prior to this release, cppcms session cookies used max-age option, that IE does not recognize. Starting from this release the session cookies would have both Expires and Max-Age options. All browsers that use Max-Age would ignore Expires if both given.</p> <p>New options that control the session cookie properties are added, see <a href="http://cppcms.com/wikipp/en/page/cppcms_1x_config#session.cookies.expiration_method">expiration_method</a> that would allow to alter the behavior and handle possible clock skew issues</p> <p>Special thanks to Saikumar Gandapodi who reported me this issue.</p> </div> Security bug fix release - CppCMS 1.0.3 http://blog.cppcms.com/post/113 http://blog.cppcms.com/post/113 <div style="direction:ltr"> <p>CppCMS 1.0.3 was released today, it includes security bug fix.</p> <p>This bug allowed CppCMS encoding validation to accept some invalid UTF-8 sequences which could potentially lead to various security problems like XSS and more.</p> <p>It is strongly recommended to upgrade to latest version.</p> <p><strong>Note:</strong> for thous who used <code>booster::locale::utf::utf_traits</code> or functions <code>booster::locale::conv::utf_to_utf</code> directly rather than using built in CppCMS forms validation/XSS validation, you may need to recompile the application to get the updates.</p> <p>The release is available on sourceforge and in the official repositories for Ubuntu oneiric, precise and quantal, Debian squeeze, Fedora 16 and 17, Centos 6 and Open Suse 11.4 and 12.1</p> </div> We are under attack... http://blog.cppcms.com/post/112 http://blog.cppcms.com/post/112 <div style="direction:ltr"> <p>Here in Israel...</p> <p>I hear explosions of Grad rockets fired by Hamas to our cities. I hear sirens that gives us <a href="http://youtu.be/gsm-mEy38pQ">short</a> alarms to run for shelters.</p> <p>This is daily routine...</p> <div style="text-align:center"><iframe width="420" height="315" src="http://www.youtube.com/embed/86FdnMIcS1A" frameborder="0" allowfullscreen></iframe></div> <p><a href="http://www.youtube.com/watch?NR=1&amp;v=LxX6f5R4-3E">What Gives Israel the Right to Defend Itself?</a></p> <p><strong>Artyom Beilis,</strong></p> <p><strong>Lead CppCMS Developer, from Israel</strong></p> </div> SVN Repositories Had Moved to New Location http://blog.cppcms.com/post/111 http://blog.cppcms.com/post/111 <div style="direction:ltr"> <p>Due to upgrades on sourceforge the svn repositories had moved. If you are using the version from SVN-Trunk, please checkout them once again:</p> <p>CppCMS</p> <ul> <li><strong>HTTP-Protocol:</strong> http://svn.code.sf.net/p/cppcms/code/framework/trunk</li> <li><strong>SVN-Protocol:</strong> svn://svn.code.sf.net/p/cppcms/code/framework/trunk</li> </ul> <p>CppDB</p> <ul> <li><strong>HTTP-Protocol:</strong> http://svn.code.sf.net/p/cppcms/code/cppdb/trunk</li> <li><strong>SVN-Protocol:</strong> svn://svn.code.sf.net/p/cppcms/code/cppdb/trunk</li> </ul> </div> Server-Sent Events in CppCMS Trunk http://blog.cppcms.com/post/110 http://blog.cppcms.com/post/110 <div style="direction:ltr"> <p>There is a simple class added to the contrib section in trunk.</p> <p><a href="https://cppcms.svn.sourceforge.net/svnroot/cppcms/framework/trunk/contrib/server_side/sse/">https://cppcms.svn.sourceforge.net/svnroot/cppcms/framework/trunk/contrib/server_side/sse/</a></p> <p>The Server-Sent Events support is provide in form of a generic class <code>sse::event_source</code> that the user expected to derive from.</p> <p>Also two simple event source objects with a predefined policy:</p> <ul> <li>Queue bounded up to certain capacity: <code>sse::bounded_event_queue</code></li> <li>Real time state updates that allows to keep clients updated with the latest events - rather than sending all the events from the beginning: <code>sse::state_stream</code></li> </ul> <p>Examples of a simple chat and a stock ticker are provided.</p> <p>Notes:</p> <ul> <li>the <code>sse::event_source</code> supports falling back to long polling using XHR by sending a special header, notifying the server that the connection should be closed rather than kept open.</li> <li>Also the code resides withing trunk, it is fully useful with current stable CppCMS release - 1.0.2.</li> <li>This code does nothing exceptional, you don't really have to use it to create SSE, it is just makes it easy to handle them without knowing too much about server-side event driven programming.</li> </ul> </div> CppCMS 1.0.2 - Bug Fix Release http://blog.cppcms.com/post/109 http://blog.cppcms.com/post/109 <div style="direction:ltr"> <p>CppCMS 1.0.2 Released, it is a bug fix release.</p> <p>Fixed Bugs:</p> <ul> <li>Fixed incorrect HTML generation using <code>as_table</code></li> <li>Fixed build issues with latest ICU: 3540278</li> <li>Fixed some warnings in Boost.Locale</li> <li>Fixed missing error report in case of running out of disk space in file upload: 3542469</li> <li>Fixed visual studio 11 build issues: 3527712,3527702</li> <li>Fixed problem with using automatic type detection in C++11 mode with gcc 3537374</li> <li>Fixed bugs that made stackstream useless</li> <li>Fixed issues build issues on Mac OS X: 3513865</li> <li>Fixed OpenSSL detection on Windows: 3515712</li> <li>Fixed incorrect scgi configuration for nginx in <code>cppcms_run</code></li> </ul> </div>