component.hpp

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#pragma once
 
/// @file userver/server/component.hpp
/// @brief @copybrief components::Server
 
#include <memory>
 
#include <userver/components/component_base.hpp>
#include <userver/engine/task/task_processor_fwd.hpp>
#include <userver/server/server.hpp>
#include <userver/utils/statistics/entry.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace components {
 
/// @ingroup userver_components
///
/// @brief Component that listens for incoming requests, manages
/// incoming connections and passes the requests to the appropriate handler.
///
/// Starts listening and accepting connections only after **all** the
/// components are loaded.
///
/// All the classes inherited from server::handlers::HttpHandlerBase and
/// registered in components list bind to the components::Server component.
///
/// ## components::Server Dynamic config
/// * @ref USERVER_LOG_REQUEST
/// * @ref USERVER_LOG_REQUEST_HEADERS
/// * @ref USERVER_DEADLINE_PROPAGATION_ENABLED
/// * @ref USERVER_CANCEL_HANDLE_REQUEST_BY_DEADLINE
///
/// ## Static options of components::Server :
///
/// Server is configured by 'listener' and 'listener-monitor' entries.
/// 'listener' is a required entry that describes the request processing
/// socket. 'listener-monitor' is an optional entry that describes the special
/// monitoring socket, used for getting statistics and processing utility
/// requests that should succeed even is the main socket is under heavy pressure.
///
/// @include{doc} scripts/docs/en/components_schema/core/src/server/component.md
///
/// Options inherited from @ref components::RawComponentBase :
/// @include{doc} scripts/docs/en/components_schema/core/src/components/impl/component_base.md
///
/// @see @ref scripts/docs/en/userver/http_server.md
class Server final : public ComponentBase {
public:
    /// @ingroup userver_component_names
    /// @brief The default name of @ref components::Server component
    static constexpr std::string_view kName = "server";
 
    Server(const components::ComponentConfig& component_config, const components::ComponentContext& component_context);
 
    ~Server() override;
 
    void OnAllComponentsLoaded() override;
 
    void OnAllComponentsAreStopping() override;
 
    const server::Server& GetServer() const;
 
    server::Server& GetServer();
 
    void AddHandler(const server::handlers::HttpHandlerBase& handler, engine::TaskProcessor& task_processor);
 
    static yaml_config::Schema GetStaticConfigSchema();
 
private:
    void WriteStatistics(utils::statistics::Writer& writer);
 
    std::unique_ptr<server::Server> server_;
    utils::statistics::Entry server_statistics_holder_;
    utils::statistics::Entry handler_statistics_holder_;
};
 
template <>
inline constexpr bool kHasValidate<Server> = true;
 
}  // namespace components
 
USERVER_NAMESPACE_END