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149 lines
5.7 KiB
Plaintext
149 lines
5.7 KiB
Plaintext
POCO ApacheConnector User Guide
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POCO ApacheConnector
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!!!Introduction
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ApacheConnector (<[mod_poco]>) is an Apache module that allows one to write Apache server extensions using
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the POCO Net HTTPServer framework. Almost any subclass of Poco::Net::HTTPRequestHandler written
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for Poco::Net::HTTPServer can be used with ApacheConnector. For this to work, the request handler
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subclass, together with its factory (Poco::Net::HTTPRequestHandlerFactory) must be contained
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in a shared library. The ApacheConnector uses the Poco::ClassLoader to load request handler
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factories from shared libraries.
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!!!Adding ApacheConnector to Apache
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ApacheConnector is implemented as an ordinary Apache 2 module, named <[mod_poco]>.
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To add <[mod_poco]> to Apache, add the following entry to the Apache configuration
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file (usually <[httpd.conf]>):
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LoadModule poco_module modules/mod_pocod.so
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----
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!!!Configuring ApacheConnector
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ApacheConnector must be able to find shared libraries containing request handler, as well
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as optional configuration files. ApacheConnector provides an Poco::Util::Application class
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to request handlers that can be used to access configuration data, loaded from configuration
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files.
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!!Request Handler Configuration
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To have the ApacheConnector load a request handler class, the <[AddPocoRequestHandler]> directive
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is used in the Apache configuration file:
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AddPocoRequestHandler <FactoryClass> <SharedLibrary> <Path>...
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----
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The first argument specifies the name of the request handler factory class. The second argument
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contains the path of the shared library containing the request handler.
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The third (and optionally following) argument(s) specify the URI paths handled by the
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request handler. For example:
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AddPocoRequestHandler TimeRequestHandlerFactory p:/Poco/ApacheConnector/samples/TimeServer/bin/TimeServerd.dll /time
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----
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loads the TimeRequestHandlerFactory from TimeServerd.dll. Whenever a request for a URI starting with "/time"
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is sent by a client, this request will be handled by the TimeRequestHandler.
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!!Configuration Files
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ApacheConnector can also load POCO configuration files (.ini, .properties or .xml) for later use by
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request handlers. This is done using the <[AddPocoConfig]> directive:
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AddPocoConfig <Path>
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----
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where <Path> specifies the full path to the configuration file.
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In a request handler, the configuration properties loaded this way can be accessed using:
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Poco::Util::Application& app = Poco::Util::Application::instance();
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std::string myProp = app.config().getString("MyProperty");
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----
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!!!Logging in Request Handlers
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ApacheConnector provides a special logging channel that logs to Apache's error log file.
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This channel is set as the root channel when the ApacheConnector is loaded, so every
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logger will automatically inherit this channel.
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!!!A Sample Request Handler
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Following is a sample for a request handler implementation. The complete sample project can be found in the
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<[samples]> subdirectory of the ApacheConnector directory.
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#include "Poco/Net/HTTPServer.h"
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#include "Poco/Net/HTTPRequestHandler.h"
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#include "Poco/Net/HTTPRequestHandlerFactory.h"
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#include "Poco/Net/HTTPServerRequest.h"
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#include "Poco/Net/HTTPServerResponse.h"
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#include "Poco/Timestamp.h"
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#include "Poco/DateTimeFormatter.h"
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#include "Poco/DateTimeFormat.h"
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#include "Poco/ClassLibrary.h"
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using Poco::Net::HTTPRequestHandler;
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using Poco::Net::HTTPRequestHandlerFactory;
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using Poco::Net::HTTPServerRequest;
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using Poco::Net::HTTPServerResponse;
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using Poco::Timestamp;
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using Poco::DateTimeFormatter;
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using Poco::DateTimeFormat;
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class TimeRequestHandler: public HTTPRequestHandler
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/// Return a HTML document with the current date and time.
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{
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public:
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TimeRequestHandler()
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{
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}
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void handleRequest(HTTPServerRequest& request, HTTPServerResponse& response)
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{
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Timestamp now;
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std::string dt(DateTimeFormatter::format(now, DateTimeFormat::SORTABLE_FORMAT));
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response.setChunkedTransferEncoding(true);
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response.setContentType("text/html");
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std::ostream& ostr = response.send();
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ostr << "<html><head><title>TimeServer powered by POCO ApacheConnector</title>";
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ostr << "<meta http-equiv=\"refresh\" content=\"1\"></head>";
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ostr << "<body><p style=\"text-align: center; font-size: 48px;\">";
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ostr << dt;
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ostr << "</p></body></html>";
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}
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};
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class TimeRequestHandlerFactory: public HTTPRequestHandlerFactory
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{
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public:
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TimeRequestHandlerFactory()
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{
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}
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HTTPRequestHandler* createRequestHandler(const HTTPServerRequest& request)
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{
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return new TimeRequestHandler;
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}
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};
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POCO_BEGIN_MANIFEST(HTTPRequestHandlerFactory)
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POCO_EXPORT_CLASS(TimeRequestHandlerFactory)
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POCO_END_MANIFEST
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----
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Both the TimeRequestHandler class and the TimeRequestHandlerFactory class are the same as for
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an ordinary Poco::Net::HTTPServer. The only addition in this sample is the definition
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of the class loader manifest, which allows the ApacheConnector to load the TimeRequestHandlerFactory
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class from the shared library.
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To run this sample, the following directives must be added to the Apache configuration files:
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LoadModule poco_module p:/Poco/ApacheConnector/bin/mod_poco.so
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AddPocoRequestHandler TimeRequestHandlerFactory p:/Poco/ApacheConnector/samples/TimeServer/bin/TimeServer.dll /time
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----
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You'll have to change the paths to <[mod_poco.so]> and <[TimeServer.dll]> to match your
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own environment.
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To test the sample, simply direct your favorite web browser to <http://localhost/time>.
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