httphandler.h

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#pragma once
 
 
#include <promeki/config.h>
#if PROMEKI_ENABLE_HTTP
#include <functional>
#include <promeki/function.h>
#include <promeki/namespace.h>
#include <promeki/sharedptr.h>
#include <promeki/list.h>
#include <promeki/httprequest.h>
#include <promeki/httpresponse.h>
 
PROMEKI_NAMESPACE_BEGIN
 
using HttpHandlerFunc = Function<void(const HttpRequest &request, HttpResponse &response)>;
 
using HttpHandlerFuncList = ::promeki::List<HttpHandlerFunc>;
 
using HttpMiddleware =
        Function<void(const HttpRequest &request, HttpResponse &response, Function<void()> next)>;
 
using HttpMiddlewareList = ::promeki::List<HttpMiddleware>;
 
class HttpHandler {
        public:
                // Hand-rolled SHARED pattern instead of PROMEKI_SHARED_BASE:
                // we want _promeki_clone() to be pure virtual so concrete
                // leaves (with their own state) are forced at compile time
                // to provide their own override.  PROMEKI_SHARED_BASE
                // would synthesize a non-pure body that aborts at runtime
                // for an abstract type, which is silently weaker.  Same
                // approach used by MediaPayload and StringData.
                RefCount             _promeki_refct;
                virtual HttpHandler *_promeki_clone() const = 0;
 
                using Ptr = SharedPtr<HttpHandler, false>;
 
                virtual ~HttpHandler() = default;
 
                virtual void serve(const HttpRequest &request, HttpResponse &response) = 0;
};
 
class HttpFunctionHandler : public HttpHandler {
                PROMEKI_SHARED_DERIVED(HttpFunctionHandler)
        public:
                explicit HttpFunctionHandler(HttpHandlerFunc func) : _func(std::move(func)) {}
 
                void serve(const HttpRequest &request, HttpResponse &response) override {
                        if (_func) _func(request, response);
                }
 
        private:
                HttpHandlerFunc _func;
};
 
PROMEKI_NAMESPACE_END
 
#endif // PROMEKI_ENABLE_HTTP