drogon::HttpMiddlewareBase Class Reference

The abstract base class for middleware. More...

#include <drogon/HttpMiddleware.h>

Inheritance diagram for drogon::HttpMiddlewareBase:

Collaboration diagram for drogon::HttpMiddlewareBase:

Public Member Functions
virtual void	invoke (const HttpRequestPtr &req, MiddlewareNextCallback &&nextCb, MiddlewareCallback &&mcb)=0
Public Member Functions inherited from drogon::DrObjectBase
virtual const std::string &	className () const
	Get the class name.
virtual bool	isClass (const std::string &class_name) const
	Return true if the class name is 'class_name'.

Detailed Description

The abstract base class for middleware.

Member Function Documentation

invoke()

virtual void drogon::HttpMiddlewareBase::invoke ( const HttpRequestPtr & req, MiddlewareNextCallback && nextCb, MiddlewareCallback && mcb )

pure virtual

This virtual function should be overridden in subclasses.

Example:

void invoke(const HttpRequestPtr &req,
            MiddlewareNextCallback &&nextCb,
            MiddlewareCallback &&mcb) override
 {
    if (req->path() == "/some/path") {
        // intercept directly
        mcb(HttpResponse::newNotFoundResponse(req));
        return;
    }
    // Do something before calling the next middleware
    nextCb([mcb = std::move(mcb)](const HttpResponsePtr &resp) {
        // Do something after the next middleware returns
        mcb(resp);
    });
}

Implemented in drogon::HttpOptionsMiddlewareImpl< Derived, AutoCreation >, drogon::HttpOptionsMiddlewareImpl< HttpOptionsMiddleware, false >, and drogon::HttpOptionsMiddlewareImpl< HttpOptionsMiddlewareAuto, true >.

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The documentation for this class was generated from the following file:

• lib/inc/drogon/HttpMiddleware.h