server::handlers::HandlerBase Class Reference

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

Detailed Description

Base class for the request handlers.

Each handler has an associated path and invoked only for the requests for that path.

Static options:

Name	Description	Default value
path	if a request matches this path wildcard then process it by handler	-
as_fallback	set to "implicit-http-options" and do not specify a path if this handler processes the OPTIONS requests for paths that do not process OPTIONS method	-
task_processor	a task processor to execute the requests	-
method	comma-separated list of allowed HTTP methods. HEAD method is implicitly enabled if GET method is enabled	-
max_request_size	max size of the whole request	1024 * 1024
max_headers_size	max request headers size	65536
parse_args_from_body	optional field to parse request according to x-www-form-urlencoded rules and make parameters accessible as query parameters	false
auth	server::handlers::auth::HandlerAuthConfig authorization config	-
url_trailing_slash	'both' to treat URLs with and without a trailing slash as equal, 'strict-match' otherwise	'both'
max_requests_in_flight	integer to limit max pending requests to this handler	<no limit>
request_body_size_log_limit	trim request to this size before logging	512
request_headers_size_log_limit	limit on the total length of logged headers	512
response_data_size_log_limit	trim responses to this size before logging	512
max_requests_per_second	integer to limit RPS to this handler	<no limit>
decompress_request	allow decompression of the requests	true
throttling_enabled	allow throttling of the requests by components::Server , for more info see its max_response_size_in_flight and requests_queue_size_threshold options	true
set-response-server-hostname	set to true to add the X-YaTaxi-Server-Hostname header with instance name, set to false to not add the header	<takes the value from components::Server config>
monitor-handler	Overrides the in-code is_monitor flag that makes the handler run either on server.listener or on server.listener-monitor	–
set_tracing_headers	whether to set http tracing headers (X-YaTraceId, X-YaSpanId, X-RequestId)	true
deadline_propagation_enabled	when false, disables HTTP handler deadline propagation	true
deadline_expired_status_code	the HTTP status code to return if the request deadline expires	498

Definition at line 49 of file handler_base.hpp.

Inheritance diagram for server::handlers::HandlerBase:

Public Member Functions
	HandlerBase (const components::ComponentConfig &config, const components::ComponentContext &component_context, bool is_monitor=false)
virtual void	PrepareAndHandleRequest (http::HttpRequest &request, request::RequestContext &context) const =0
virtual void	ReportMalformedRequest (http::HttpRequest &) const
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.

Member Typedef Documentation

ClientError

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

protected

Definition at line 80 of file handler_base.hpp.

ExternalBody

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

protected

Definition at line 78 of file handler_base.hpp.

HandlerErrorCode

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

protected

Definition at line 76 of file handler_base.hpp.

InternalMessage

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

protected

Definition at line 77 of file handler_base.hpp.

InternalServerError

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

protected

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.

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.

IsMonitor()

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

inline

Returns whether this is a monitoring handler.

Definition at line 67 of file 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.

PrepareAndHandleRequest()

virtual void server::handlers::HandlerBase::PrepareAndHandleRequest ( http::HttpRequest & request, request::RequestContext & context ) const

pure virtual

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

Implemented in server::handlers::HttpHandlerBase.

ReportMalformedRequest()

virtual void server::handlers::HandlerBase::ReportMalformedRequest ( http::HttpRequest & ) const

inlinevirtual

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

Reimplemented in server::handlers::HttpHandlerBase.

Definition at line 64 of file handler_base.hpp.

---

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

• userver/server/handlers/handler_base.hpp