log_level.hpp

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#pragma once
 
/// @file userver/server/handlers/log_level.hpp
/// @brief @copybrief server::handlers::LogLevel
 
#include <userver/concurrent/variable.hpp>
#include <userver/logging/level.hpp>
#include <userver/server/handlers/http_handler_base.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace components {
class Logging;
}  // namespace components
 
namespace server::handlers {
/// @ingroup userver_components userver_http_handlers
///
/// @brief Handler that controls logging levels of all the loggers.
///
/// The component has no service configuration except the
/// @ref userver_http_handlers "common handler options".
///
/// ## Static configuration example:
///
/// @snippet components/common_server_component_list_test.cpp  Sample handler log level component config
///
/// ## Scheme
/// For the GET and PUT requests this handler returns the following JSON:
/// @code
/// {
///   "init-log-level": <log level on service start>,
///   "current-log-level": <current log level>
/// }
/// @endcode
///
/// Particular logger name could be specified by an optional `logger` query
/// argument. Default logger is used, if no `logger` was provided.
///
/// PUT request changes the logger level to the value specified in the `level`
/// query argument. Set it to the `reset` value, to reset the logger level to
/// the initial values.
///
/// @see @ref scripts/docs/en/userver/log_level_running_service.md
class LogLevel final : public HttpHandlerBase {
public:
    LogLevel(const components::ComponentConfig& config, const components::ComponentContext& component_context);
 
    /// @ingroup userver_component_names
    /// @brief The default name of server::handlers::LogLevel
    static constexpr std::string_view kName = "handler-log-level";
 
    std::string HandleRequestThrow(const http::HttpRequest& request, request::RequestContext&) const override;
 
    static yaml_config::Schema GetStaticConfigSchema();
 
private:
    std::string ProcessGet(const http::HttpRequest& request, request::RequestContext&) const;
    std::string ProcessPut(const http::HttpRequest& request, request::RequestContext&) const;
 
    components::Logging& logging_component_;
    struct Data {
        logging::Level default_init_level;
        mutable std::unordered_map<std::string, logging::Level> init_levels;
    };
    concurrent::Variable<Data> data_;
};
 
}  // namespace server::handlers
 
template <>
inline constexpr bool components::kHasValidate<server::handlers::LogLevel> = true;
 
USERVER_NAMESPACE_END