/*
  +----------------------------------------------------------------------+
  | Swoole                                                               |
  +----------------------------------------------------------------------+
  | This source file is subject to version 2.0 of the Apache license,    |
  | that is bundled with this package in the file LICENSE, and is        |
  | available through the world-wide-web at the following url:           |
  | http://www.apache.org/licenses/LICENSE-2.0.html                      |
  | If you did not receive a copy of the Apache2.0 license and are unable|
  | to obtain it through the world-wide-web, please send a note to       |
  | license@php.net so we can mail you a copy immediately.               |
  +----------------------------------------------------------------------+
  | Author: Tianfeng Han  <rango@swoole.com>                             |
  +----------------------------------------------------------------------+
*/

#pragma once

#include "swoole_api.h"
#include "swoole_string.h"
#include "swoole_socket.h"
#include "swoole_timer.h"
#include "swoole_reactor.h"
#include "swoole_signal.h"
#include "swoole_protocol.h"
#include "swoole_process_pool.h"
#include "swoole_pipe.h"
#include "swoole_channel.h"
#include "swoole_message_bus.h"
#ifdef SW_THREAD
#include "swoole_lock.h"
#endif

#ifdef SW_USE_OPENSSL
#include "swoole_dtls.h"
#endif

#ifdef __MACH__
#include <sys/syslimits.h>
#endif

#include <string>
#include <queue>
#include <thread>
#include <mutex>
#include <atomic>
#include <unordered_map>
#include <unordered_set>
#include <condition_variable>

//------------------------------------Server-------------------------------------------
namespace swoole {

namespace http_server {
struct Request;
}

class Server;
struct Manager;

typedef std::function<void(void)> WorkerFn;

struct Session {
    SessionId id;
    int fd;
    uint32_t reactor_id : 8;
    uint32_t reserve_ : 24;
};

struct Connection {
    /**
     * It must be in the header. When set to 0, it means that connection does not exist.
     * One-write and multiple-read operation is thread-safe
     * system fd must be 0. en: signalfd, listen socket
     */
    uint8_t active;
    SocketType socket_type;
    int fd;
    int worker_id;
    SessionId session_id;
    //--------------------------------------------------------------
#ifdef SW_USE_OPENSSL
    uint8_t ssl;
    uint8_t ssl_ready;
#endif
    uint8_t overflow;
    uint8_t high_watermark;
    uint8_t http_upgrade;
    uint8_t http2_stream;
#ifdef SW_HAVE_ZLIB
    uint8_t websocket_compression;
#endif
    // If it is equal to 1, it means server actively closed the connection
    uint8_t close_actively;
    uint8_t closed;
    uint8_t close_queued;
    uint8_t closing;
    uint8_t close_reset;
    uint8_t peer_closed;
    // protected connection, do not close connection when receiving/sending timeout
    uint8_t protect;
    uint8_t close_notify;
    uint8_t close_force;
    ReactorId reactor_id;
    uint16_t close_errno;
    int server_fd;
    sw_atomic_t recv_queued_bytes;
    uint32_t send_queued_bytes;
    uint16_t waiting_time;
    TimerNode *timer;
    /**
     * socket address
     */
    network::Address info;
    /**
     * link any thing, for kernel, do not use with application.
     */
    void *object;
    /**
     * socket, only operated in the main process
     */
    network::Socket *socket;
    /**
     * connect/recv/send/close time
     */
    double connect_time;
    double last_recv_time;
    double last_send_time;
    double last_dispatch_time;
    /**
     * bind uid
     */
    uint32_t uid;
    /**
     * upgarde websocket
     */
    uint8_t websocket_status;
    /**
     * unfinished data frame
     */
    String *websocket_buffer;

#ifdef SW_USE_OPENSSL
    String *ssl_client_cert;
    pid_t ssl_client_cert_pid;
#endif
    sw_atomic_t lock;
};

//------------------------------------ReactorThread-------------------------------------------
struct ReactorThread {
    int id;
    std::thread thread;
    network::Socket *notify_pipe = nullptr;
    uint64_t dispatch_count = 0;
    network::Socket *pipe_command = nullptr;
    MessageBus message_bus;

    int init(Server *serv, Reactor *reactor, uint16_t reactor_id);
    void shutdown(Reactor *reactor);
    int close_connection(Reactor *reactor, SessionId session_id);
    void clean();
};

struct ServerPortGS {
    sw_atomic_t connection_num;
    sw_atomic_t *connection_nums = nullptr;
    sw_atomic_long_t abort_count;
    sw_atomic_long_t accept_count;
    sw_atomic_long_t close_count;
    sw_atomic_long_t dispatch_count;
    sw_atomic_long_t request_count;
    sw_atomic_long_t response_count;
    sw_atomic_long_t total_recv_bytes;
    sw_atomic_long_t total_send_bytes;
};

struct ListenPort {
    /**
     * tcp socket listen backlog
     */
    uint16_t backlog = SW_BACKLOG;
    bool listening = false;
    /**
     * open tcp_defer_accept option
     */
    int tcp_defer_accept = 0;
    /**
     * TCP_FASTOPEN
     */
    int tcp_fastopen = 0;
    /**
     * TCP KeepAlive
     */
    int tcp_keepidle = SW_TCP_KEEPIDLE;
    int tcp_keepinterval = SW_TCP_KEEPINTERVAL;
    int tcp_keepcount = SW_TCP_KEEPCOUNT;

    int tcp_user_timeout = 0;

    double max_idle_time = 0;

    int socket_buffer_size = network::Socket::default_buffer_size;
    uint32_t buffer_high_watermark = 0;
    uint32_t buffer_low_watermark = 0;

    SocketType type = SW_SOCK_TCP;
    uint8_t ssl = 0;
    std::string host;
    int port = 0;
    network::Socket *socket = nullptr;
    pthread_t thread_id = 0;

    uint16_t heartbeat_idle_time = 0;

    /**
     * check data eof
     */
    bool open_eof_check = false;
    /**
     * built-in http protocol
     */
    bool open_http_protocol = false;
    /**
     * built-in http2.0 protocol
     */
    bool open_http2_protocol = false;
    /**
     * built-in websocket protocol
     */
    bool open_websocket_protocol = false;
    /**
     * open websocket close frame
     */
    bool open_websocket_close_frame = false;
    /**
     * open websocket ping frame
     */
    bool open_websocket_ping_frame = false;
    /**
     * open websocket pong frame
     */
    bool open_websocket_pong_frame = false;
    /**
     *  one package: length check
     */
    bool open_length_check = false;
    /**
     * for mqtt protocol
     */
    bool open_mqtt_protocol = false;
    /**
     *  redis protocol
     */
    bool open_redis_protocol = false;
    /**
     * open tcp nodelay option
     */
    bool open_tcp_nodelay = false;
    /**
     * open tcp nopush option(for sendfile)
     */
    bool open_tcp_nopush = true;
    /**
     * open tcp keepalive
     */
    bool open_tcp_keepalive = false;
    /**
     * Sec-WebSocket-Protocol
     */
    std::string websocket_subprotocol;
    /**
     * set socket option
     */
    int kernel_socket_recv_buffer_size = 0;
    int kernel_socket_send_buffer_size = 0;

#ifdef SW_USE_OPENSSL
    SSLContext *ssl_context = nullptr;
    std::unordered_map<std::string, std::shared_ptr<SSLContext>> sni_contexts;
#ifdef SW_SUPPORT_DTLS
    std::unordered_map<int, dtls::Session *> *dtls_sessions = nullptr;
    bool is_dtls() {
        return ssl_context && (ssl_context->protocols & SW_SSL_DTLS);
    }
#endif
#endif

    ServerPortGS *gs = nullptr;

    Protocol protocol = {};
    void *ptr = nullptr;

    int (*onRead)(Reactor *reactor, ListenPort *port, Event *event) = nullptr;

    bool is_dgram() {
        return network::Socket::is_dgram(type);
    }

    bool is_stream() {
        return network::Socket::is_stream(type);
    }

    void set_eof_protocol(const std::string &eof, bool find_from_right = false) {
        open_eof_check = true;
        protocol.split_by_eof = !find_from_right;
        protocol.package_eof_len = std::min(eof.length(), sizeof(protocol.package_eof));
        memcpy(protocol.package_eof, eof.c_str(), protocol.package_eof_len);
    }

    void set_length_protocol(uint32_t length_offset, char length_type, uint32_t body_offset) {
        open_length_check = true;
        protocol.package_length_type = length_type;
        protocol.package_length_size = swoole_type_size(length_type);
        protocol.package_length_offset = length_offset;
        protocol.package_body_offset = body_offset;
    }

    void set_package_max_length(uint32_t max_length) {
        protocol.package_max_length = max_length;
    }

    ListenPort();
    ~ListenPort() = default;
    int listen();
    void close();
    bool import(int sock);
    const char *get_protocols();
    int create_socket(Server *server);
    void close_socket();

#ifdef SW_USE_OPENSSL
    bool ssl_create_context(SSLContext *context);
    bool ssl_create(Connection *conn, network::Socket *sock);
    bool ssl_add_sni_cert(const std::string &name, SSLContext *context);
    bool ssl_init();

    void ssl_set_key_file(const std::string &file) {
        ssl_context->key_file = file;
    }
    void ssl_set_cert_file(const std::string &file) {
        ssl_context->cert_file = file;
    }
#endif
    void clear_protocol();
    network::Socket *get_socket() {
        return socket;
    }
    int get_port() const {
        return port;
    }
    const char *get_host() const {
        return host.c_str();
    }
    SocketType get_type() const {
        return type;
    }
    int get_fd() const {
        return socket ? socket->fd : -1;
    }

    size_t get_connection_num() const;
};

struct ServerGS {
    pid_t master_pid;
    pid_t manager_pid;

    SessionId session_round;
    sw_atomic_t start;
    sw_atomic_t shutdown;

    int max_fd;
    int min_fd;

    bool called_onStart;
    time_t start_time;
    sw_atomic_t connection_num;
    sw_atomic_t *connection_nums = nullptr;
    sw_atomic_t tasking_num;
    uint32_t max_concurrency;
    sw_atomic_t concurrency;
    sw_atomic_long_t abort_count;
    sw_atomic_long_t accept_count;
    sw_atomic_long_t close_count;
    sw_atomic_long_t dispatch_count;
    sw_atomic_long_t request_count;
    sw_atomic_long_t response_count;
    sw_atomic_long_t total_recv_bytes;
    sw_atomic_long_t total_send_bytes;
    sw_atomic_long_t pipe_packet_msg_id;
    sw_atomic_long_t task_count;

    sw_atomic_t spinlock;

    Barrier manager_barrier;

    ProcessPool task_workers;
    ProcessPool event_workers;
};

class Factory {
  protected:
    Server *server_;

  public:
    Factory(Server *_server) {
        server_ = _server;
    }
    pid_t spawn_event_worker(Worker *worker);
    pid_t spawn_user_worker(Worker *worker);
    pid_t spawn_task_worker(Worker *worker);
    void kill_user_workers();
    void kill_event_workers();
    void kill_task_workers();
    void check_worker_exit_status(Worker *worker, const ExitStatus &exit_status);
    virtual ~Factory() {}
    virtual bool start() = 0;
    virtual bool shutdown() = 0;
    virtual bool dispatch(SendData *) = 0;
    virtual bool finish(SendData *) = 0;
    virtual bool notify(DataHead *) = 0;
    virtual bool end(SessionId sesion_id, int flags) = 0;
};

class BaseFactory : public Factory {
  public:
    BaseFactory(Server *server);
    ~BaseFactory();
    bool start() override;
    bool shutdown() override;
    bool dispatch(SendData *) override;
    bool finish(SendData *) override;
    bool notify(DataHead *) override;
    bool end(SessionId sesion_id, int flags) override;
    bool forward_message(Session *session, SendData *data);
};

class ProcessFactory : public Factory {
  public:
    ProcessFactory(Server *server);
    ~ProcessFactory();
    bool start() override;
    bool shutdown() override;
    bool dispatch(SendData *) override;
    bool finish(SendData *) override;
    bool notify(DataHead *) override;
    bool end(SessionId sesion_id, int flags) override;
};

class ThreadFactory : public BaseFactory {
  private:
    std::vector<std::thread> threads_;
    std::mutex lock_;
    std::condition_variable cv_;
    std::queue<Worker *> queue_;
    long cv_timeout_ms_;
    bool reload_all_workers;
    bool reloading;
    Worker manager;
    template <typename _Callable>
    void create_thread(int i, _Callable fn);
    void join_thread(std::thread &thread);
    void at_thread_exit(Worker *worker);
    void create_message_bus();
    void destroy_message_bus();

  public:
    ThreadFactory(Server *server);
    ~ThreadFactory();
    void spawn_event_worker(WorkerId i);
    void spawn_task_worker(WorkerId i);
    void spawn_user_worker(WorkerId i);
    void spawn_manager_thread(WorkerId i);
    void wait();
    bool reload(bool reload_all_workers);
    bool start() override;
    bool shutdown() override;
};

enum ServerEventType {
    // recv data payload
    SW_SERVER_EVENT_RECV_DATA,
    SW_SERVER_EVENT_RECV_DGRAM,
    // send data
    SW_SERVER_EVENT_SEND_DATA,
    SW_SERVER_EVENT_SEND_FILE,
    // connection event
    SW_SERVER_EVENT_CLOSE,
    SW_SERVER_EVENT_CONNECT,
    SW_SERVER_EVENT_CLOSE_FORCE,
    // task
    SW_SERVER_EVENT_TASK,
    SW_SERVER_EVENT_FINISH,
    // pipe
    SW_SERVER_EVENT_PIPE_MESSAGE,
    // event operate
    SW_SERVER_EVENT_PAUSE_RECV,
    SW_SERVER_EVENT_RESUME_RECV,
    // buffer event
    SW_SERVER_EVENT_BUFFER_FULL,
    SW_SERVER_EVENT_BUFFER_EMPTY,
    // process message
    SW_SERVER_EVENT_INCOMING,
    SW_SERVER_EVENT_SHUTDOWN,
    SW_SERVER_EVENT_COMMAND_REQUEST,
    SW_SERVER_EVENT_COMMAND_RESPONSE,
};

class Server {
  public:
    typedef int (*DispatchFunction)(Server *, Connection *, SendData *);

    struct Command {
        typedef std::function<void(Server *, const std::string &msg)> Callback;
        typedef std::function<std::string(Server *, const std::string &msg)> Handler;
        enum ProcessType {
            MASTER = 1u << 1,
            REACTOR_THREAD = 1u << 2,
            EVENT_WORKER = 1u << 3,
            TASK_WORKER = 1u << 4,
            MANAGER = 1u << 5,
            ALL_PROCESS = MASTER | REACTOR_THREAD | EVENT_WORKER | TASK_WORKER | MANAGER,
        };
        int id;
        int accepted_process_types;
        std::string name;
    };

    enum Mode {
        MODE_BASE = 1,
        MODE_PROCESS = 2,
        MODE_THREAD = 3,
    };

    enum TaskIpcMode {
        TASK_IPC_UNIXSOCK = 1,
        TASK_IPC_MSGQUEUE = 2,
        TASK_IPC_PREEMPTIVE = 3,
        TASK_IPC_STREAM = 4,
    };

    enum ThreadType {
        THREAD_NORMAL = 0,
        THREAD_MASTER = 1,
        THREAD_REACTOR = 2,
        THREAD_HEARTBEAT = 3,
        THREAD_WORKER = 4,
    };

    enum DispatchMode {
        DISPATCH_ROUND = 1,
        DISPATCH_FDMOD = 2,
        DISPATCH_IDLE_WORKER = 3,
        DISPATCH_IPMOD = 4,
        DISPATCH_UIDMOD = 5,
        DISPATCH_USERFUNC = 6,
        DISPATCH_CO_CONN_LB = 8,
        DISPATCH_CO_REQ_LB = 9,
        DISPATCH_CONCURRENT_LB = 10,
    };

    enum FactoryDispatchResult {
        DISPATCH_RESULT_DISCARD_PACKET = -1,
        DISPATCH_RESULT_CLOSE_CONNECTION = -2,
        DISPATCH_RESULT_USERFUNC_FALLBACK = -3,
    };

    enum HookType {
        HOOK_MASTER_START,
        HOOK_MASTER_TIMER,
        HOOK_REACTOR_START,
        HOOK_WORKER_START,
        HOOK_TASK_WORKER_START,
        HOOK_MASTER_CONNECT,
        HOOK_REACTOR_CONNECT,
        HOOK_WORKER_CONNECT,
        HOOK_REACTOR_RECEIVE,
        HOOK_WORKER_RECEIVE,
        HOOK_REACTOR_CLOSE,
        HOOK_WORKER_CLOSE,
        HOOK_MANAGER_START,
        HOOK_MANAGER_TIMER,
        HOOK_PROCESS_TIMER,
        HOOK_END = SW_MAX_HOOK_TYPE - 1,
    };

    enum CloseFlag {
        CLOSE_RESET = 1u << 1,
        CLOSE_ACTIVELY = 1u << 2,
    };

    /**
     * reactor thread/process num
     */
    uint16_t reactor_num = 0;
    /**
     * worker process num
     */
    uint32_t worker_num = 0;

    uint8_t dgram_port_num = 0;

    /**
     * package dispatch mode
     */
    uint8_t dispatch_mode = DISPATCH_FDMOD;

    /**
     * No idle work process is available.
     */
    bool scheduler_warning = false;

    int worker_uid = 0;
    int worker_groupid = 0;

    /**
     * worker process max request
     */
    uint32_t max_request = 0;
    uint32_t max_request_grace = 0;

    network::Socket *udp_socket_ipv4 = nullptr;
    network::Socket *udp_socket_ipv6 = nullptr;
    network::Socket *dgram_socket = nullptr;
    int null_fd = -1;

    uint32_t max_wait_time = SW_WORKER_MAX_WAIT_TIME;
    uint32_t worker_max_concurrency = UINT_MAX;

    /*----------------------------Reactor schedule--------------------------------*/
    sw_atomic_t worker_round_id = 0;

    /**
     * worker(worker and task_worker) process chroot / user / group
     */
    std::string chroot_;
    std::string user_;
    std::string group_;

    /**
     * run as a daemon process
     */
    bool daemonize = false;
    /**
     * have dgram socket
     */
    bool have_dgram_sock = false;
    /**
     * have stream socket
     */
    bool have_stream_sock = false;
    /**
     * open cpu affinity setting
     */
    bool open_cpu_affinity = false;
    /**
     * disable notice when use SW_DISPATCH_ROUND and SW_DISPATCH_QUEUE
     */
    bool disable_notify = false;
    /**
     * discard the timeout request
     */
    bool discard_timeout_request = false;
    /**
     * parse cookie header
     */
    bool http_parse_cookie = true;
    /**
     * parse x-www-form-urlencoded data
     */
    bool http_parse_post = true;
    /**
     * parse multipart/form-data files to match $_FILES
     */
    bool http_parse_files = false;
    /**
     * http content compression
     */
    bool http_compression = false;
    /**
     * RFC-7692
     */
    bool websocket_compression = false;
    /**
     * handle static files
     */
    bool enable_static_handler = false;
    /**
     * show file list in the current directory
     */
    bool http_autoindex = false;
    /**
     * enable onConnect/onClose event when use dispatch_mode=1/3
     */
    bool enable_unsafe_event = false;
    /**
     * waiting for worker onConnect callback function to return
     */
    bool enable_delay_receive = false;
    /**
     * reuse port
     */
    bool enable_reuse_port = false;
    /**
     * asynchronous reloading
     */
    bool reload_async = true;
    /**
     * use event object
     */
    bool event_object = false;
    /**
     * use task object
     */
    bool task_object = false;
    /**
     * enable coroutine in task worker
     */
    bool task_enable_coroutine = false;
    /**
     * yield coroutine when the output buffer is full
     */
    bool send_yield = true;
    /**
     * enable coroutine
     */
    bool enable_coroutine = true;
    /**
     * disable multi-threads
     */
    bool single_thread = false;
    /**
     * server status
     */
    bool running = true;

    int *cpu_affinity_available = 0;
    int cpu_affinity_available_num = 0;

    UnixSocket *pipe_command = nullptr;
    MessageBus message_bus;

    double send_timeout = 0;

    uint16_t heartbeat_check_interval = 0;

    time_t reload_time = 0;
    time_t warning_time = 0;
    long timezone_ = 0;
    TimerNode *master_timer = nullptr;
    TimerNode *heartbeat_timer = nullptr;

    /* buffer output/input setting*/
    uint32_t output_buffer_size = UINT_MAX;
    uint32_t input_buffer_size = SW_INPUT_BUFFER_SIZE;
    uint32_t max_queued_bytes = 0;

    /**
     * the master process and worker process communicate using unix socket dgram.
     * ipc_max_size represents the maximum size of each datagram,
     * which is obtained from the kernel send buffer of unix socket in swServer_set_ipc_max_size function.
     */
    uint32_t ipc_max_size = SW_IPC_MAX_SIZE;

    void *private_data_1 = nullptr;
    void *private_data_2 = nullptr;
    void *private_data_3 = nullptr;
    void *private_data_4 = nullptr;

    Factory *factory = nullptr;
    Manager *manager = nullptr;

    std::vector<ListenPort *> ports;
    std::vector<std::shared_ptr<UnixSocket>> worker_pipes;

    ListenPort *get_primary_port() {
        return ports.front();
    }

    enum Mode get_mode() const {
        return mode_;
    };

    /**
     * This method can only be used for INET ports and cannot obtain Unix socket ports.
     */
    ListenPort *get_port(int _port) const {
        for (auto port : ports) {
            if (port->port == _port || _port == 0) {
                return port;
            }
        }
        return nullptr;
    }

    ListenPort *get_port(SocketType type, const char *host, int _port) const {
        for (auto port : ports) {
            if (port->port == _port && port->type == type && strcmp(host, port->host.c_str()) == 0) {
                return port;
            }
        }
        return nullptr;
    }

    ListenPort *get_port_by_server_fd(int server_fd) const {
        return (ListenPort *) connection_list[server_fd].object;
    }

    ListenPort *get_port_by_fd(int fd) const {
        return get_port_by_server_fd(connection_list[fd].server_fd);
    }

    ListenPort *get_port_by_session_id(SessionId session_id) const {
        Connection *conn = get_connection_by_session_id(session_id);
        if (!conn) {
            return nullptr;
        }
        return get_port_by_fd(conn->fd);
    }

    network::Socket *get_server_socket(int fd) const {
        return connection_list[fd].socket;
    }

    network::Socket *get_command_reply_socket() {
        return is_base_mode() ? get_worker(0)->pipe_master : pipe_command->get_socket(false);
    }

    network::Socket *get_worker_pipe_master(WorkerId id) {
        return get_worker(id)->pipe_master;
    }

    network::Socket *get_worker_pipe_worker(WorkerId id) {
        return get_worker(id)->pipe_worker;
    }

    /**
     * [Worker|Master]
     */
    network::Socket *get_reactor_pipe_socket(SessionId session_id, int reactor_id) {
        int pipe_index = session_id % reactor_pipe_num;
        /**
         * pipe_worker_id: The pipe in which worker.
         */
        int pipe_worker_id = reactor_id + (pipe_index * reactor_num);
        Worker *worker = get_worker(pipe_worker_id);
        return worker->pipe_worker;
    }

    /**
     *  task process
     */
    uint32_t task_worker_num = 0;
    uint8_t task_ipc_mode = TASK_IPC_UNIXSOCK;
    uint32_t task_max_request = 0;
    uint32_t task_max_request_grace = 0;
    std::vector<std::shared_ptr<Pipe>> task_notify_pipes;
    EventData *task_results = nullptr;

    /**
     * Used for process management, saving the mapping relationship between PID and worker pointers
     */
    std::unordered_map<pid_t, Worker *> user_worker_map;
    /**
     * Shared memory, sharing state between processes
     */
    Worker *user_workers = nullptr;

    std::unordered_map<std::string, Command> commands;
    std::unordered_map<int, Command::Handler> command_handlers;
    std::unordered_map<int64_t, Command::Callback> command_callbacks;
    int command_current_id = 1;
    int64_t command_current_request_id = 1;

    Worker *workers = nullptr;
    ServerGS *gs = nullptr;

    std::shared_ptr<std::unordered_set<std::string>> locations = nullptr;
    std::shared_ptr<std::vector<std::string>> http_index_files = nullptr;
    std::shared_ptr<std::unordered_set<std::string>> http_compression_types = nullptr;

    Barrier reactor_thread_barrier = {};

    /**
     * temporary directory for HTTP uploaded file.
     */
    std::string upload_tmp_dir = "/tmp";
    /**
     * Write the uploaded file in form-data to disk file
     */
    size_t upload_max_filesize = 0;
    /**
     * http compression level for gzip/br
     */
    uint8_t http_compression_level = 0;
    uint32_t compression_min_length;
    /**
     * master process pid
     */
    std::string pid_file;

    EventData *last_task = nullptr;
    std::queue<String *> *buffer_pool = nullptr;

    const Allocator *recv_buffer_allocator = &SwooleG.std_allocator;
    size_t recv_buffer_size = SW_BUFFER_SIZE_BIG;

    int manager_alarm = 0;

    /**
     * message queue key
     */
    uint64_t message_queue_key = 0;

    void *hooks[SW_MAX_HOOK_TYPE] = {};

    /*----------------------------Event Callback--------------------------------*/
    /**
     * Master Process
     */
    std::function<void(Server *)> onStart;
    std::function<void(Server *)> onBeforeShutdown;
    std::function<void(Server *)> onShutdown;
    /**
     * Manager Process
     */
    std::function<void(Server *)> onManagerStart;
    std::function<void(Server *)> onManagerStop;
    std::function<void(Server *, Worker *, const ExitStatus &)> onWorkerError;
    std::function<void(Server *)> onBeforeReload;
    std::function<void(Server *)> onAfterReload;
    /**
     * Worker Process
     */
    std::function<void(Server *, EventData *)> onPipeMessage;
    std::function<void(Server *, Worker *)> onWorkerStart;
    std::function<void(Server *, Worker *)> onWorkerStop;
    std::function<void(Server *, Worker *)> onWorkerExit;
    std::function<void(Server *, Worker *)> onUserWorkerStart;
    /**
     * Connection
     */
    std::function<int(Server *, RecvData *)> onReceive;
    std::function<int(Server *, RecvData *)> onPacket;
    std::function<void(Server *, DataHead *)> onClose;
    std::function<void(Server *, DataHead *)> onConnect;
    std::function<void(Server *, DataHead *)> onBufferFull;
    std::function<void(Server *, DataHead *)> onBufferEmpty;
    /**
     * Task Worker
     */
    std::function<int(Server *, EventData *)> onTask;
    std::function<int(Server *, EventData *)> onFinish;
    /**
     * for MessageBus
     */
    std::function<uint64_t(void)> msg_id_generator;
    /**
     * Hook
     */
    int (*dispatch_func)(Server *, Connection *, SendData *) = nullptr;

  public:
    Server(enum Mode _mode = MODE_BASE);
    ~Server();

    bool set_document_root(const std::string &path) {
        if (path.length() > PATH_MAX) {
            swoole_warning("The length of document_root must be less than %d", PATH_MAX);
            return false;
        }

        char _realpath[PATH_MAX];
        if (!realpath(path.c_str(), _realpath)) {
            swoole_warning("document_root[%s] does not exist", path.c_str());
            return false;
        }

        document_root = std::string(_realpath);
        return true;
    }

    void add_static_handler_location(const std::string &);
    void add_static_handler_index_files(const std::string &);
    bool select_static_handler(http_server::Request *request, Connection *conn);
    void add_http_compression_type(const std::string &type);

    int create();
    Factory *create_base_factory();
    Factory *create_thread_factory();
    Factory *create_process_factory();
    bool create_worker_pipes();
    void destroy_base_factory();
    void destroy_thread_factory();
    void destroy_process_factory();

    int start();
    bool reload(bool reload_all_workers);
    bool shutdown();

    int add_worker(Worker *worker);
    ListenPort *add_port(SocketType type, const char *host, int port);
    int add_systemd_socket();
    int add_hook(enum HookType type, const Callback &func, int push_back);
    bool add_command(const std::string &command, int accepted_process_types, const Command::Handler &func);
    Connection *add_connection(ListenPort *ls, network::Socket *_socket, int server_fd);
    void abort_connection(Reactor *reactor, ListenPort *ls, network::Socket *_socket);
    void abort_worker(Worker *worker);
    void reset_worker_counter(Worker *worker);
    int connection_incoming(Reactor *reactor, Connection *conn);

    int get_idle_worker_num();
    int get_idle_task_worker_num();
    int get_tasking_num();

    TaskId get_task_id(EventData *task) {
        return gs->task_workers.get_task_id(task);
    }

    uint16_t get_command_id(EventData *cmd) {
        return cmd->info.server_fd;
    }

    EventData *get_task_result() {
        return &(task_results[swoole_get_process_id()]);
    }

    WorkerId get_task_src_worker_id(EventData *task) {
        return gs->task_workers.get_task_src_worker_id(task);
    }

    int get_minfd() {
        return gs->min_fd;
    }

    int get_maxfd() {
        return gs->max_fd;
    }

    void set_maxfd(int maxfd) {
        gs->max_fd = maxfd;
    }

    void set_minfd(int minfd) {
        gs->min_fd = minfd;
    }

    pid_t get_master_pid() {
        return gs->master_pid;
    }

    pid_t get_manager_pid() {
        return gs->manager_pid;
    }

    void store_listen_socket();
    void store_pipe_fd(UnixSocket *p);

    const std::string &get_document_root() {
        return document_root;
    }

    String *get_recv_buffer(network::Socket *_socket) {
        String *buffer = _socket->recv_buffer;
        if (buffer == nullptr) {
            buffer = swoole::make_string(SW_BUFFER_SIZE_BIG, recv_buffer_allocator);
            if (!buffer) {
                return nullptr;
            }
            _socket->recv_buffer = buffer;
        }

        return buffer;
    }

    MessageBus *get_worker_message_bus() {
#ifdef SW_THREAD
        return sw_likely(is_thread_mode()) ? SwooleTG.message_bus : &message_bus;
#else
        return &message_bus;
#endif
    }

    uint32_t get_worker_buffer_num() {
        return is_base_mode() ? 1 : reactor_num + dgram_port_num;
    }

    bool is_support_unsafe_events() {
        if (is_hash_dispatch_mode()) {
            return true;
        } else {
            return enable_unsafe_event;
        }
    }

    bool is_process_mode() {
        return mode_ == MODE_PROCESS;
    }

    bool is_base_mode() {
        return mode_ == MODE_BASE;
    }

    bool is_thread_mode() {
        return mode_ == MODE_THREAD;
    }

    bool is_enable_coroutine() {
        if (is_task_worker()) {
            return task_enable_coroutine;
        } else if (is_manager()) {
            return false;
        } else {
            return enable_coroutine;
        }
    }

    bool is_master_thread() {
        return swoole_get_thread_type() == Server::THREAD_MASTER;
    }

    bool is_hash_dispatch_mode() {
        return dispatch_mode == DISPATCH_FDMOD || dispatch_mode == DISPATCH_IPMOD ||
               dispatch_mode == DISPATCH_CO_CONN_LB;
    }

    bool is_support_send_yield() {
        return is_hash_dispatch_mode();
    }

    bool if_require_packet_callback(ListenPort *port, bool isset) {
#ifdef SW_USE_OPENSSL
        return (port->is_dgram() && !port->ssl && !isset);
#else
        return (port->is_dgram() && !isset);
#endif
    }

    bool if_require_receive_callback(ListenPort *port, bool isset) {
#ifdef SW_USE_OPENSSL
        return (((port->is_dgram() && port->ssl) || port->is_stream()) && !isset);
#else
        return (port->is_stream() && !isset);
#endif
    }

    bool if_forward_message(Session *session) {
        return session->reactor_id != swoole_get_process_id();
    }

    Worker *get_worker(uint16_t worker_id) {
        // Event Worker
        if (worker_id < worker_num) {
            return &(gs->event_workers.workers[worker_id]);
        }

        // Task Worker
        uint32_t task_worker_max = task_worker_num + worker_num;
        if (worker_id < task_worker_max) {
            return &(gs->task_workers.workers[worker_id - worker_num]);
        }

        // User Worker
        uint32_t user_worker_max = task_worker_max + user_worker_list.size();
        if (worker_id < user_worker_max) {
            return &(user_workers[worker_id - task_worker_max]);
        }

        return nullptr;
    }

    bool kill_worker(WorkerId worker_id, bool wait_reactor);
    void stop_async_worker(Worker *worker);
    void stop_master_thread();
    void join_heartbeat_thread();

    Pipe *get_pipe_object(int pipe_fd) {
        return (Pipe *) connection_list[pipe_fd].object;
    }

    size_t get_all_worker_num() {
        return get_core_worker_num() + get_user_worker_num();
    }

    size_t get_user_worker_num() {
        return user_worker_list.size();
    }

    size_t get_core_worker_num() {
        return worker_num + task_worker_num;
    }

    ReactorThread *get_thread(int reactor_id) {
        return &reactor_threads[reactor_id];
    }

    bool is_started() {
        return gs->start;
    }

    bool is_created() {
        return factory != nullptr;
    }

    bool is_running() {
        return running;
    }

    bool is_master() {
        return swoole_get_process_type() == SW_PROCESS_MASTER;
    }

    bool is_worker() {
        return swoole_get_process_type() == SW_PROCESS_EVENTWORKER;
    }

    bool is_event_worker() {
        return is_worker();
    }

    bool is_task_worker() {
        return swoole_get_process_type() == SW_PROCESS_TASKWORKER;
    }

    bool is_manager() {
        return swoole_get_process_type() == SW_PROCESS_MANAGER;
    }

    bool is_user_worker() {
        return swoole_get_process_type() == SW_PROCESS_USERWORKER;
    }

    bool is_worker_thread() {
        return is_thread_mode() && swoole_get_thread_type() == Server::THREAD_WORKER;
    }

    bool is_worker_process() {
        return !is_thread_mode() && (is_worker() || is_task_worker());
    }

    bool is_reactor_thread() {
        return swoole_get_thread_type() == Server::THREAD_REACTOR;
    }

    bool is_single_worker() {
        return (worker_num == 1 && task_worker_num == 0 && max_request == 0 && get_user_worker_num() == 0);
    }

    bool isset_hook(enum HookType type) {
        assert(type <= HOOK_END);
        return hooks[type];
    }

    bool is_sync_process() {
        if (is_manager()) {
            return true;
        }
        if (is_task_worker() && !task_enable_coroutine) {
            return true;
        }
        return false;
    }
    bool is_shutdown() {
        return gs->shutdown;
    }

    // can only be used in the main process
    bool is_valid_connection(Connection *conn) {
        return (conn && conn->socket && conn->active && conn->socket->fd_type == SW_FD_SESSION);
    }

    bool is_healthy_connection(double now, Connection *conn);

    static int is_dgram_event(uint8_t type) {
        switch (type) {
        case SW_SERVER_EVENT_RECV_DGRAM:
            return true;
        default:
            return false;
        }
    }

    static int is_stream_event(uint8_t type) {
        switch (type) {
        case SW_SERVER_EVENT_RECV_DATA:
        case SW_SERVER_EVENT_SEND_DATA:
        case SW_SERVER_EVENT_SEND_FILE:
        case SW_SERVER_EVENT_CONNECT:
        case SW_SERVER_EVENT_CLOSE:
        case SW_SERVER_EVENT_PAUSE_RECV:
        case SW_SERVER_EVENT_RESUME_RECV:
        case SW_SERVER_EVENT_BUFFER_FULL:
        case SW_SERVER_EVENT_BUFFER_EMPTY:
            return true;
        default:
            return false;
        }
    }

    int get_connection_fd(SessionId session_id) const {
        return session_list[session_id % SW_SESSION_LIST_SIZE].fd;
    }

    Connection *get_connection_verify_no_ssl(SessionId session_id) {
        Session *session = get_session(session_id);
        int fd = session->fd;
        Connection *conn = get_connection(fd);
        if (!conn || conn->active == 0) {
            return nullptr;
        }
        if (session->id != session_id || conn->session_id != session_id) {
            return nullptr;
        }
        return conn;
    }

    Connection *get_connection_verify(SessionId session_id) {
        Connection *conn = get_connection_verify_no_ssl(session_id);
#ifdef SW_USE_OPENSSL
        if (conn && conn->ssl && !conn->ssl_ready) {
            return nullptr;
        }
#endif
        return conn;
    }

    Connection *get_connection(int fd) const {
        if ((uint32_t) fd > max_connection) {
            return nullptr;
        }
        return &connection_list[fd];
    }

    Connection *get_connection_for_iterator(int fd) {
        Connection *conn = get_connection(fd);
        if (conn && conn->active && !conn->closed) {
#ifdef SW_USE_OPENSSL
            if (conn->ssl && !conn->ssl_ready) {
                return nullptr;
            }
#endif
            return conn;
        }
        return nullptr;
    }

    Connection *get_connection_by_session_id(SessionId session_id) const {
        return get_connection(get_connection_fd(session_id));
    }

    Session *get_session(SessionId session_id) {
        return &session_list[session_id % SW_SESSION_LIST_SIZE];
    }

    void clear_timer();
    static void timer_callback(Timer *timer, TimerNode *tnode);

    int create_task_workers();
    int create_user_workers();
    int start_manager_process();

    void call_hook(enum HookType type, void *arg);
    void call_worker_start_callback(Worker *worker);
    void call_worker_stop_callback(Worker *worker);
    void call_worker_error_callback(Worker *worker, const ExitStatus &status);
    void call_command_handler(MessageBus &mb, uint16_t worker_id, network::Socket *sock);
    std::string call_command_handler_in_master(int command_id, const std::string &msg);
    void call_command_callback(int64_t request_id, const std::string &result);
    void foreach_connection(const std::function<void(Connection *)> &callback);
    static int accept_connection(Reactor *reactor, Event *event);
#ifdef SW_SUPPORT_DTLS
    dtls::Session *accept_dtls_connection(ListenPort *ls, network::Address *sa);
#endif
    static int accept_command_result(Reactor *reactor, Event *event);
    static int close_connection(Reactor *reactor, network::Socket *_socket);
    static int dispatch_task(const Protocol *proto, network::Socket *_socket, const RecvData *rdata);

    int send_to_connection(SendData *);
    ssize_t send_to_worker_from_worker(Worker *dst_worker, const void *buf, size_t len, int flags);

    ssize_t send_to_worker_from_worker(WorkerId id, EventData *data, int flags) {
        return send_to_worker_from_worker(get_worker(id), data, data->size(), flags);
    }

    ssize_t send_to_reactor_thread(const EventData *ev_data, size_t sendn, SessionId session_id);

    bool send(SessionId session_id, const void *data, uint32_t length);
    bool sendfile(SessionId session_id, const char *file, uint32_t l_file, off_t offset, size_t length);
    bool sendwait(SessionId session_id, const void *data, uint32_t length);
    bool close(SessionId session_id, bool reset);

    bool notify(Connection *conn, enum ServerEventType event);
    bool feedback(Connection *conn, enum ServerEventType event);
    bool command(WorkerId process_id,
                 Command::ProcessType process_type,
                 const std::string &name,
                 const std::string &msg,
                 const Command::Callback &fn);

    bool task(EventData *task, int *dst_worker_id, bool blocking = false);
    bool finish(const char *data, size_t data_len, int flags, EventData *current_task);
    bool task_sync(EventData *task, int *dst_worker_id, double timeout);
    bool send_pipe_message(WorkerId worker_id, EventData *msg);

    void init_reactor(Reactor *reactor);
    void init_event_worker(Worker *worker);
    void init_task_workers();
    void init_port_protocol(ListenPort *port);
    void init_signal_handler();
    void init_ipc_max_size();
    void init_pipe_sockets(MessageBus *mb);

    void set_max_connection(uint32_t _max_connection);

    void set_max_concurrency(uint32_t _max_concurrency) {
        if (_max_concurrency == 0) {
            _max_concurrency = UINT_MAX;
        }
        gs->max_concurrency = _max_concurrency;
    }

    void set_worker_max_concurrency(uint32_t _max_concurrency) {
        if (_max_concurrency == 0) {
            _max_concurrency = UINT_MAX;
        }
        worker_max_concurrency = _max_concurrency;
    }

    uint32_t get_max_connection() {
        return max_connection;
    }

    uint32_t get_max_concurrency() {
        return gs->max_concurrency;
    }

    uint32_t get_concurrency() {
        return gs->concurrency;
    }

    bool is_unavailable() {
        return get_concurrency() >= get_max_concurrency();
    }

    uint32_t get_worker_max_concurrency() {
        return worker_max_concurrency;
    }

    void set_start_session_id(SessionId value) {
        if (value > UINT_MAX) {
            value = UINT_MAX;
        }
        gs->session_round = value;
    }

    int create_pipe_buffers();
    void release_pipe_buffers();
    void create_worker(Worker *worker);
    void destroy_worker(Worker *worker);
    void disable_accept();
    void destroy_http_request(Connection *conn);

    int schedule_worker(int fd, SendData *data);

    size_t get_connection_num() const {
        if (gs->connection_nums) {
            size_t num = 0;
            for (uint32_t i = 0; i < worker_num; i++) {
                num += gs->connection_nums[i];
            }
            return num;
        } else {
            return gs->connection_num;
        }
    }

    static int wait_other_worker(ProcessPool *pool, const ExitStatus &exit_status);
    static void read_worker_message(ProcessPool *pool, EventData *msg);

    void drain_worker_pipe();
    void clean_worker_connections(Worker *worker);

    /**
     * [Worker]
     */
    void worker_start_callback(Worker *worker);
    void worker_stop_callback(Worker *worker);
    void worker_accept_event(DataHead *info);
    void worker_signal_init(void);

    std::function<void(const WorkerFn &fn)> worker_thread_start;
    std::function<void(pthread_t ptid)> worker_thread_join;
    std::function<int(pthread_t ptid)> worker_thread_get_exit_status;

    /**
     * [Master]
     */
    bool signal_handler_shutdown();
    bool signal_handler_child_exit();
    bool signal_handler_reload(bool reload_all_workers);
    bool signal_handler_read_message();
    bool signal_handler_reopen_logger();

    static void worker_signal_handler(int signo);
    static int reactor_process_main_loop(ProcessPool *pool, Worker *worker);
    static void reactor_thread_main_loop(Server *serv, int reactor_id);
    static bool task_pack(EventData *task, const void *data, size_t data_len);
    static bool task_unpack(EventData *task, String *buffer, PacketPtr *packet);
    static void master_signal_handler(int signo);

    int start_master_thread(Reactor *reactor);
    int start_event_worker(Worker *worker);
    void start_heartbeat_thread();
    const char *get_startup_error_message();

  private:
    enum Mode mode_;
    Connection *connection_list = nullptr;
    Session *session_list = nullptr;
    ServerPortGS *port_gs_list = nullptr;
    /**
     * http static file directory
     */
    std::string document_root;
    std::mutex lock_;
    uint32_t max_connection = 0;
    TimerNode *enable_accept_timer = nullptr;
    std::thread heartbeat_thread;
    /**
     * The number of pipe per reactor maintenance
     */
    uint16_t reactor_pipe_num = 0;
    ReactorThread *reactor_threads = nullptr;
    /**
     * Only used for temporarily saving pointers in add_worker()
     */
    std::vector<Worker *> user_worker_list;

    int start_check();
    void check_port_type(ListenPort *ls);
    void destroy();
    int start_reactor_threads();
    int start_reactor_processes();
    int start_worker_threads();
    void stop_worker_threads();
    bool reload_worker_threads(bool reload_all_workers);
    void join_reactor_thread();
    TimerCallback get_timeout_callback(ListenPort *port, Reactor *reactor, Connection *conn);

    int get_lowest_load_worker_id() {
        uint32_t lowest_load_worker_id = 0;
        size_t min_coroutine = workers[0].coroutine_num;
        for (uint32_t i = 1; i < worker_num; i++) {
            if (workers[i].coroutine_num < min_coroutine) {
                min_coroutine = workers[i].coroutine_num;
                lowest_load_worker_id = i;
                continue;
            }
        }
        return lowest_load_worker_id;
    }

    int get_lowest_concurrent_worker_id() {
        uint32_t lowest_concurrent_worker_id = 0;
        size_t min_concurrency = workers[0].concurrency;
        for (uint32_t i = 1; i < worker_num; i++) {
            if (workers[i].concurrency < min_concurrency) {
                min_concurrency = workers[i].concurrency;
                lowest_concurrent_worker_id = i;
                continue;
            }
        }
        return lowest_concurrent_worker_id;
    }

    int get_idle_worker_id() {
        bool found = false;
        uint32_t key = 0;
        SW_LOOP_N(worker_num + 1) {
            key = sw_atomic_fetch_add(&worker_round_id, 1) % worker_num;
            if (workers[key].is_idle()) {
                found = true;
                break;
            }
        }
        if (sw_unlikely(!found)) {
            scheduler_warning = true;
        }
        swoole_trace_log(SW_TRACE_SERVER, "schedule=%d, round=%d", key, worker_round_id);
        return key;
    }

    void lock() {
        lock_.lock();
    }

    void unlock() {
        lock_.unlock();
    }
};

}  // namespace swoole

typedef swoole::Server swServer;
typedef swoole::ListenPort swListenPort;
typedef swoole::RecvData swRecvData;

extern swoole::Server *g_server_instance;

static inline swoole::Server *sw_server() {
    return g_server_instance;
}
