health_check.hpp

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#ifndef NEFORCE_NETWORK_HTTP_HEALTH_CHECK_HPP__
#define NEFORCE_NETWORK_HTTP_HEALTH_CHECK_HPP__

 
#include "NeForce/network/http/http_filter.hpp"
NEFORCE_BEGIN_NAMESPACE__
NEFORCE_BEGIN_HTTP__


class NEFORCE_API health_check_filter final : public http_filter {
public:
    string path{"/healthz"}; 
    bool show_details{true}; 
    bool enabled{true};      
 
    using check_callback = function<bool()>;
 
    health_check_filter() = default;

    void add_check(const string& name, check_callback check) { checks_[name] = move(check); }
 
    void remove_check(const string& name) { checks_.erase(name); }
 
    bool pre_filter(http_request& request, http_response& response) override;
    void do_filter(http_request& /*request*/, http_response& /*response*/) override {}
    NEFORCE_NODISCARD string name() const override { return "health_check_filter"; }
 
private:
    unordered_map<string, check_callback> checks_;
    int64_t start_time_ms_{0}; 
 
    pair<string, bool> build_health_json();
};
 
// TODO: Metrics collection — request count, latency percentiles (p50/p95/p99), error rate, active connections gauge
// TODO: Prometheus exposition format — /metrics endpoint with Prometheus text format for scraping
// TODO: OpenTelemetry tracing — distributed trace context propagation (W3C TraceContext / B3), span export to OTLP/Jaeger/Zipkin
// TODO: Admin endpoints — /actuator/loggers (dynamic log level), /actuator/threaddump, /actuator/env
 // HTTP
 
NEFORCE_END_HTTP__
NEFORCE_END_NAMESPACE__
#endif // NEFORCE_NETWORK_HTTP_HEALTH_CHECK_HPP__