#include <userver/server/handlers/http_handler_flatbuf_base.hpp>

Detailed Description

template<typename InputType, typename ReturnType>
class server::handlers::HttpHandlerFlatbufBase< InputType, ReturnType >

Convenient base for handlers that accept requests with body in Flatbuffer format and respond with body in Flatbuffer format.

Example usage:

#include <userver/server/handlers/http_handler_flatbuf_base.hpp>
#include "flatbuffer_schema.fbs.h"
 
namespace samples::fbs_handle {
 
class FbsSumEcho final : public server::handlers::HttpHandlerFlatbufBase<fbs::SampleRequest, fbs::SampleResponse> {
public:
    // `kName` is used as the component name in static config
    static constexpr std::string_view kName = "handler-fbs-sample";
 
    // Component is valid after construction and is able to accept requests
    FbsSumEcho(const components::ComponentConfig& config, const components::ComponentContext& context)
        : HttpHandlerFlatbufBase(config, context) {}
 
    fbs::SampleResponse::NativeTableType
    HandleRequestFlatbufThrow(const server::http::HttpRequest& request, const fbs::SampleRequest::NativeTableType& fbs_request, server::request::RequestContext&)
        const override {
        request.GetHttpResponse().SetContentType(http::content_type::kApplicationOctetStream);
        fbs::SampleResponse::NativeTableType res;
        res.sum = fbs_request.arg1 + fbs_request.arg2;
        res.echo = fbs_request.data;
        return res;
    }
};
 
}  // namespace samples::fbs_handle

Examples: samples/flatbuf_service/flatbuf_service.cpp.

Definition at line 40 of file http_handler_flatbuf_base.hpp.

Inheritance diagram for server::handlers::HttpHandlerFlatbufBase< InputType, ReturnType >:

Public Member Functions
	HttpHandlerFlatbufBase (const components::ComponentConfig &config, const components::ComponentContext &component_context)

std::string	HandleRequestThrow (const http::HttpRequest &request, request::RequestContext &context) const final

virtual ReturnType::NativeTableType	HandleRequestFlatbufThrow (const http::HttpRequest &request, const typename InputType::NativeTableType &input, request::RequestContext &context) const =0

const InputType::NativeTableType *	GetInputData (const request::RequestContext &context) const

const ReturnType::NativeTableType *	GetOutputData (const request::RequestContext &context) const

void	HandleRequest (request::RequestBase &request, request::RequestContext &context) const override

void	ReportMalformedRequest (request::RequestBase &request) const final

virtual const std::string &	HandlerName () const

const std::vector< http::HttpMethod > &	GetAllowedMethods () const

virtual logging::Level	GetLogLevelForResponseStatus (http::HttpStatus status) const

virtual FormattedErrorData	GetFormattedExternalErrorBody (const CustomHandlerException &exc) const

std::string	GetResponseDataForLoggingChecked (const http::HttpRequest &request, request::RequestContext &context, const std::string &response_data) const

void	HandleCustomHandlerException (const http::HttpRequest &request, const CustomHandlerException &ex) const

void	HandleUnknownException (const http::HttpRequest &request, const std::exception &ex) const

void	LogUnknownException (const std::exception &ex, std::optional< logging::Level > log_level_override={}) const
	Helper function to log an unknown exception.

const std::optional< logging::Level > &	GetLogLevel () const
	Returns the default log level for the handler.

bool	IsMonitor () const
	Returns whether this is a monitoring handler.

const HandlerConfig &	GetConfig () const
	Returns handler config.

ComponentHealth	GetComponentHealth () const override

void	OnLoadingCancelled () override

void	OnAllComponentsLoaded () override

void	OnAllComponentsAreStopping () override

Static Public Member Functions
static yaml_config::Schema	GetStaticConfigSchema ()

Protected Types
using	HandlerErrorCode = handlers::HandlerErrorCode

using	InternalMessage = handlers::InternalMessage

using	ExternalBody = handlers::ExternalBody

using	ClientError = handlers::ClientError

using	InternalServerError = handlers::InternalServerError

using	LoggableComponentBase = ComponentBase
	Legacy alias, use ComponentBase instead.

Protected Member Functions
std::string	GetRequestBodyForLogging (const http::HttpRequest &request, request::RequestContext &context, const std::string &request_body) const override
	Override it if you need a custom request body logging.

std::string	GetResponseDataForLogging (const http::HttpRequest &request, request::RequestContext &context, const std::string &response_data) const override
	Override it if you need a custom response data logging.

void	ParseRequestData (const http::HttpRequest &request, request::RequestContext &context) const final

void	ThrowUnsupportedHttpMethod (const http::HttpRequest &request) const

virtual void	HandleStreamRequest (const server::http::HttpRequest &, server::request::RequestContext &, server::http::ResponseBodyStream &) const

virtual bool	IsStreamed () const

virtual bool	IsMethodStatisticIncluded () const

virtual bool	NeedCheckAuth () const

virtual std::string	GetMetaType (const http::HttpRequest &) const

Member Typedef Documentation

◆ ClientError

using server::handlers::HandlerBase::ClientError = handlers::ClientError

protectedinherited

Definition at line 80 of file handler_base.hpp.

◆ ExternalBody

using server::handlers::HandlerBase::ExternalBody = handlers::ExternalBody

protectedinherited

Definition at line 78 of file handler_base.hpp.

◆ HandlerErrorCode

using server::handlers::HandlerBase::HandlerErrorCode = handlers::HandlerErrorCode

protectedinherited

Definition at line 76 of file handler_base.hpp.

◆ InternalMessage

using server::handlers::HandlerBase::InternalMessage = handlers::InternalMessage

protectedinherited

Definition at line 77 of file handler_base.hpp.

◆ InternalServerError

using server::handlers::HandlerBase::InternalServerError = handlers::InternalServerError

protectedinherited

Definition at line 81 of file handler_base.hpp.

◆ LoggableComponentBase

using components::ComponentBase::LoggableComponentBase = ComponentBase

protectedinherited

Legacy alias, use ComponentBase instead.

Definition at line 67 of file component_base.hpp.

Constructor & Destructor Documentation

◆ HttpHandlerFlatbufBase()

template<typename InputType , typename ReturnType >

server::handlers::HttpHandlerFlatbufBase< InputType, ReturnType >::HttpHandlerFlatbufBase	(	const components::ComponentConfig &	config,
		const components::ComponentContext &	component_context )

Definition at line 93 of file http_handler_flatbuf_base.hpp.

Member Function Documentation

◆ GetComponentHealth()

ComponentHealth components::ComponentBase::GetComponentHealth ( ) const

inlineoverridevirtualinherited

Override this function to inform the world of the state of your component.

Warning: The function is called concurrently from multiple threads.

Reimplemented from components::RawComponentBase.

Reimplemented in server::handlers::Restart.

Definition at line 35 of file component_base.hpp.

◆ GetInputData()

template<typename InputType , typename ReturnType >

const InputType::NativeTableType * server::handlers::HttpHandlerFlatbufBase< InputType, ReturnType >::GetInputData ( const request::RequestContext & context ) const

Returns: A pointer to input data if it was parsed successfully or nullptr otherwise.

Definition at line 117 of file http_handler_flatbuf_base.hpp.

◆ GetLogLevelForResponseStatus()

virtual logging::Level server::handlers::HttpHandlerBase::GetLogLevelForResponseStatus ( http::HttpStatus status ) const

virtualinherited

Override it if you need a custom logging level for messages about finish of request handling for some http statuses.

◆ GetOutputData()

template<typename InputType , typename ReturnType >

const ReturnType::NativeTableType * server::handlers::HttpHandlerFlatbufBase< InputType, ReturnType >::GetOutputData ( const request::RequestContext & context ) const

Returns: a pointer to output data if it was returned successfully by HandleRequestFlatbufThrow() or nullptr otherwise.

Definition at line 124 of file http_handler_flatbuf_base.hpp.

◆ GetRequestBodyForLogging()

template<typename InputType , typename ReturnType >

std::string server::handlers::HttpHandlerFlatbufBase< InputType, ReturnType >::GetRequestBodyForLogging	(	const http::HttpRequest &	request,
		request::RequestContext &	context,
		const std::string &	request_body ) const

overrideprotectedvirtual

Override it if you need a custom request body logging.

Reimplemented from server::handlers::HttpHandlerBase.

Definition at line 131 of file http_handler_flatbuf_base.hpp.

◆ GetResponseDataForLogging()

template<typename InputType , typename ReturnType >

std::string server::handlers::HttpHandlerFlatbufBase< InputType, ReturnType >::GetResponseDataForLogging	(	const http::HttpRequest &	request,
		request::RequestContext &	context,
		const std::string &	response_data ) const

overrideprotectedvirtual

Override it if you need a custom response data logging.

Reimplemented from server::handlers::HttpHandlerBase.

Definition at line 141 of file http_handler_flatbuf_base.hpp.

◆ GetStaticConfigSchema()

template<typename InputType , typename ReturnType >

yaml_config::Schema server::handlers::HttpHandlerFlatbufBase< InputType, ReturnType >::GetStaticConfigSchema ( )

static

Definition at line 169 of file http_handler_flatbuf_base.hpp.

◆ HandleCustomHandlerException()

void server::handlers::HttpHandlerBase::HandleCustomHandlerException	(	const http::HttpRequest &	request,
		const CustomHandlerException &	ex ) const

inherited

Takes the exception and formats it into response, as specified by exception.

◆ HandleRequest()

void server::handlers::HttpHandlerBase::HandleRequest	(	request::RequestBase &	request,
		request::RequestContext &	context ) const

overridevirtualinherited

Parses request, executes processing routines, and fills response accordingly. Does not throw.

Implements server::handlers::HandlerBase.

◆ HandleRequestThrow()

template<typename InputType , typename ReturnType >

std::string server::handlers::HttpHandlerFlatbufBase< InputType, ReturnType >::HandleRequestThrow	(	const http::HttpRequest &	request,
		request::RequestContext &	context ) const

finalvirtual

The core method for HTTP request handling. request arg contains HTTP headers, full body, etc. The method should return response body.

Note: It is used only if IsStreamed() returned false.

Reimplemented from server::handlers::HttpHandlerBase.

Definition at line 100 of file http_handler_flatbuf_base.hpp.

◆ HandleStreamRequest()

virtual void server::handlers::HttpHandlerBase::HandleStreamRequest	(	const server::http::HttpRequest &	,
		server::request::RequestContext &	,
		server::http::ResponseBodyStream &	) const

protectedvirtualinherited

The core method for HTTP request handling. request arg contains HTTP headers, full body, etc. The response body is passed in parts to ResponseBodyStream. Stream transmission is useful when: 1) The body size is unknown beforehand. 2) The client may take advantage of early body transmission (e.g. a Web Browser may start rendering the HTML page or downloading dependant resources). 3) The body size is huge and we want to have only a part of it in memory.

Note: It is used only if IsStreamed() returned true.

◆ HandleUnknownException()

void server::handlers::HttpHandlerBase::HandleUnknownException	(	const http::HttpRequest &	request,
		const std::exception &	ex ) const

inherited

Takes the exception and formats it into response as an internal server error.

◆ IsMethodStatisticIncluded()

virtual bool server::handlers::HttpHandlerBase::IsMethodStatisticIncluded ( ) const

inlineprotectedvirtualinherited

Override it to show per HTTP-method statistics besides statistics for all methods

Definition at line 154 of file http_handler_base.hpp.

◆ IsMonitor()

bool server::handlers::HandlerBase::IsMonitor ( ) const

inlineinherited

Returns whether this is a monitoring handler.

Definition at line 67 of file handler_base.hpp.

◆ IsStreamed()

virtual bool server::handlers::HttpHandlerBase::IsStreamed ( ) const

inlineprotectedvirtualinherited

If IsStreamed() returns true, call HandleStreamRequest() for request handling, HandleRequestThrow() is not called. If it returns false, HandleRequestThrow() is called instead, and HandleStreamRequest() is not called.

Note: The default implementation returns the cached value of "response-body-streamed" value from static config.

Definition at line 150 of file http_handler_base.hpp.

◆ NeedCheckAuth()

virtual bool server::handlers::HttpHandlerBase::NeedCheckAuth ( ) const

inlineprotectedvirtualinherited

Override it if you want to disable auth checks in handler by some condition

Definition at line 158 of file http_handler_base.hpp.

◆ OnAllComponentsAreStopping()

void components::ComponentBase::OnAllComponentsAreStopping ( )

inlineoverridevirtualinherited

Component may use this function to stop doing work before the stop of the components that depend on it.

Base components may override it and make final to do some work before the derived object constructor is called. Don't use it otherwise.

Reimplemented from components::RawComponentBase.

Reimplemented in urabbitmq::ConsumerComponentBase, and components::Server.

Definition at line 58 of file component_base.hpp.

◆ OnAllComponentsLoaded()

void components::ComponentBase::OnAllComponentsLoaded ( )

inlineoverridevirtualinherited

Component may use this function to finalize registration of other components that depend on it (for example, handler components register in server component, and the latter uses OnAllComponentsLoaded() to start processing requests).

Base components may override it and make final to do some work after the derived object constructor is called. Don't use it otherwise.

Reimplemented from components::RawComponentBase.

Reimplemented in urabbitmq::ConsumerComponentBase, components::Server, and server::handlers::Ping.

Definition at line 51 of file component_base.hpp.

◆ OnLoadingCancelled()

void components::ComponentBase::OnLoadingCancelled ( )

inlineoverridevirtualinherited

Called once if the creation of any other component failed. If the current component expects some other component to take any action with the current component, this call is a signal that such action may never happen due to components loading was cancelled. Application components might not want to override it.

Reimplemented from components::RawComponentBase.

Definition at line 42 of file component_base.hpp.

◆ ParseRequestData()

template<typename InputType , typename ReturnType >

void server::handlers::HttpHandlerFlatbufBase< InputType, ReturnType >::ParseRequestData	(	const http::HttpRequest &	,
		request::RequestContext &	) const

finalprotectedvirtual

For internal use. You don't need to override it. This method is overridden in format-specific base handlers.

Reimplemented from server::handlers::HttpHandlerBase.

Definition at line 151 of file http_handler_flatbuf_base.hpp.

◆ ReportMalformedRequest()

void server::handlers::HttpHandlerBase::ReportMalformedRequest ( request::RequestBase & ) const

finalvirtualinherited

Produces response to a request unrecognized by the protocol based on provided generic response. Does not throw.

Reimplemented from server::handlers::HandlerBase.

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

userver/server/handlers/http_handler_flatbuf_base.hpp

Detailed Description

Example usage:

Public Member Functions

Static Public Member Functions

Protected Types

Protected Member Functions

Member Typedef Documentation

◆ ClientError

◆ ExternalBody

◆ HandlerErrorCode

◆ InternalMessage

◆ InternalServerError

◆ LoggableComponentBase

Constructor & Destructor Documentation

◆ HttpHandlerFlatbufBase()

Member Function Documentation

◆ GetComponentHealth()

◆ GetInputData()

◆ GetLogLevelForResponseStatus()

◆ GetOutputData()

◆ GetRequestBodyForLogging()

◆ GetResponseDataForLogging()

◆ GetStaticConfigSchema()

◆ HandleCustomHandlerException()

◆ HandleRequest()

◆ HandleRequestThrow()

◆ HandleStreamRequest()

◆ HandleUnknownException()

◆ IsMethodStatisticIncluded()

◆ IsMonitor()

◆ IsStreamed()

◆ NeedCheckAuth()

◆ OnAllComponentsAreStopping()

◆ OnAllComponentsLoaded()

◆ OnLoadingCancelled()

◆ ParseRequestData()

◆ ReportMalformedRequest()