I wrote a function to map to connection pool, great idea thanks, I will
have to rewrite BlogRSSFeed to not take any parameters, and use a map
instead, but now my problem is BlogRSSFeed is derived from
Wt::WResource, so env.hostName() is not accessible, so how do I tell
handleRequest what the URL is?
Thanks, I can see now that this is why writting a CMS is going to be
hard, but once I get past some of the road blocks, it will be nice.
On Mon, 2014-03-10 at 15:32 +0400, Nagaev Boris wrote:
> Hello,
>
> > addChild(&rssFeed);
>
> you should not use addChild with objects created on stack.
> addChild must be applied to dynamicaly allocated objects.
>
>
> You should create resource, wApp->addChild(resource) to prevent memory
> leak of resouce object. Then set internal path.
>
>
> But for RSS, you should not bind resource object to application at
> all. Create server-wide resource, call server->addResource. In
> handleRequest, determine domain and use correct database connection
> object. You can pre-create database connections in pools (one pool per
> each domain). Database session object would be created and destroyed
> in handleRequest (make it a stack object).
>
>
> Something like std::map<domain, dbo connection pool>.
>
> Make sure you do not change this global object (map) from
> handleRequest, because multiple simultaneous handleRequest calls may
> exist. That is why it is important to create all pools before start of
> event loop.
>
>
> On Mon, Mar 10, 2014 at 3:13 AM, Jeffrey Scott Flesher Gmail
> <jeffrey.scott.fles...@gmail.com> wrote:
>
> I am trying to write a CMS, my idea of how to handle multiple
> domains was to create an XML file which I read in the
> constructor of home in the wt-home example, so it uses the
> env.hostName() to get the name of the key id, if it fails to
> find a key id, it will use a default or just return a 404
> error, so I do not see a security risk here, all that a user
> can do by modifying the header, is to return the wrong
> results, unless they knew the keys, all they would get is a
> default page or 404 error.
>
> File looks like this:
> <?xml version="1.0" encoding="ISO-8859-1" ?>
> <domains>
> <domain id="default" path="/home/path/default"
> title="Title" user="userName" password="Password" port="5432"
> dbname="dbName" rssTitle="blog Title"
> rssURL="http://tdl.domain.com/wt/blog";
> rssDescription="Description of rss feed"></domain>
> <domain id="localhost" path="/home/path/localhost"
> title="Title" user="userName" password="Password" port="5432"
> dbname="dbName" rssTitle="blog Title"
> rssURL="http://localhost/wt/blog"; rssDescription="Description
> of rss feed"></domain>
> <domain id="tdl.domain.com"
> path="/home/path/tdl.domain.com" title="Title" user="userName"
> password="Password" port="5432" dbname="dbName"
> rssTitle="blog Title" rssURL="http://tdl.domain.com/wt/blog";
> rssDescription="Description of rss feed"></domain>
> </domains>
>
> This file is stored in appRoot, so its not accessible to the
> public, and where database details will work for any support
> database type.
>
> I read the results into a struct called MyCmsDomain which I
> use use to create the database connection and rssFeed:
> QString filePath = appRoot().c_str();
> filePath.append("domains.xml");
> if (!readDomains(env.hostName().c_str(), filePath))
> {
> if (!readDomains("default", filePath))
> {
> return; // this should give a blank screen,
> how to fix, just a 404 error
> }
> }
> ...
> #ifdef POSTGRES
> // Wt::Dbo::SqlConnectionPool *blogDb
> blogDb_ = BlogSession::createConnectionPool("user=" +
> MyCmsDomain.user + " password=" + MyCmsDomain.password + "
> port=" + MyCmsDomain.port + " dbname=" + MyCmsDomain.dbname);
> ...
>
> BlogRSSFeed rssFeed(*blogDb_, MyCmsDomain.rssTitle,
> MyCmsDomain.rssURL, MyCmsDomain.rssDescription);
>
> I don't see any examples of using addChild, how do I do this
> exactly?
>
> addChild(&rssFeed);
>
> > Use WResource::setInternalPath to set internal path for this
> resource.
> internalPathChanged().connect(this,
> &BlogRSSFeed::handleRequest);
> handleRequest is the only function, and does not appear to
> have the right parameters, do I need another one to handle
> this?
>
> Not sure how this would work, can you give me an example?
>
> Thanks for all the help.
>
>
> On Mon, 2014-03-10 at 02:00 +0400, Nagaev Boris wrote:
>
> > Hello!
> >
> > > How do I bind the resource to the session, is there a function
> like
> > > addResource that does the same thing?
> > You can do this using application->addChild(resource) (this makes
> > application to delete resource when it is deleted, normal memory
> > management). Use WResource::setInternalPath to set internal path for
> > this resouce. Please note the resouce will be available only from
> > current session in this case.
> >
> > > In my case I use the environment env.hostName() to get the
> database
> > > connection, so this causes me to change where I need to add this
> resource.
> > env.hostName() is hostname passed in Host HTTP header. Why do you
> need
> > it to connect to your database? Using Host header to determine
> > database address may be dangerous, since everyone can tamper with
> Host
> > header making your Wt application to connect to wrong database
> server.
> > Wt application should know database connection parameters itself.
> >
> > On Mon, Mar 10, 2014 at 1:39 AM, Jeffrey Scott Flesher Gmail
> > <jeffrey.scott.fles...@gmail.com> wrote:
> > >> If you want session-specific resource, you should bind it to
> session
> > >> (parent with application object and use WResource::url() to get
> URL.
> > > How do I bind the resource to the session, is there a function
> like
> > > addResource that does the same thing?
> > >
> > >
> > >> If you need database session for you resource, this session
> object should
> > >> be created along with the resource.
> > > In my case I use the environment env.hostName() to get the
> database
> > > connection, so this causes me to change where I need to add this
> resource.
> > >
> > > Thanks for any help.
> > >
> > >
> > > On Sun, 2014-03-09 at 11:23 +0400, Nagaev Boris wrote:
> > >
> > > Hello,
> > >
> > > at least, you should not change WServer from WApplication. Methods
> > > addResource and addEntryPoint should be called before server start
> > > (WServer::start()). If you want session-specific resource, you
> should
> > > bind it to session (parent with application object and use
> > > WResource::url() to get URL. If you want server-global resource,
> you
> > > should initialize it and bind to server using addResource BEFORE
> > > server start. If you need database session for you resource, this
> > > session object should be created along with the resource.
> > >
> > > Regards,
> > > Boris Nagaev
> > >
> > >
> > > On Sun, Mar 9, 2014 at 4:50 AM, Jeffrey Scott Flesher Gmail
> > > <jeffrey.scott.fles...@gmail.com> wrote:
> > >> Moving the code in example wt-home from main into the home which
> is
> > >> derived
> > >> from WApplication, in order to setup the database based on URL,
> I found
> > >> this
> > >> crashes the system randomly, here is the Code:
> > >>
> > >> BlogRSSFeed rssFeed(*blogDb_, "Witty Wizard blog",
> > >> "http://wittywizard.org/wt/blog";, "Witty Wizard Content
> Management System
> > >> (CMS)");
> > >> env.server()->addResource(&rssFeed, "/wt/blog/feed/");
> > >>
> > >> Is this the correct way to call addResource from the Constructor
> of home?
> > >>
> > >> Thanks for any help.
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