emsApplication/sdk/include/hv/TcpClient.h

#ifndef HV_TCP_CLIENT_HPP_
#define HV_TCP_CLIENT_HPP_

#include "hsocket.h"
#include "hssl.h"
#include "hlog.h"

#include "EventLoopThread.h"
#include "Channel.h"

namespace hv {

template<class TSocketChannel = SocketChannel>
class TcpClientTmpl {
public:
    typedef std::shared_ptr<TSocketChannel> TSocketChannelPtr;

    TcpClientTmpl() {
        connect_timeout = HIO_DEFAULT_CONNECT_TIMEOUT;
        tls = false;
        tls_setting = NULL;
        reconn_setting = NULL;
        unpack_setting = NULL;
    }

    virtual ~TcpClientTmpl() {
        HV_FREE(tls_setting);
        HV_FREE(reconn_setting);
        HV_FREE(unpack_setting);
    }

    const EventLoopPtr& loop() {
        return loop_thread.loop();
    }

    //NOTE: By default, not bind local port. If necessary, you can call system api bind() after createsocket().
    //@retval >=0 connfd, <0 error
    int createsocket(int remote_port, const char* remote_host = "127.0.0.1") {
        memset(&remote_addr, 0, sizeof(remote_addr));
        int ret = sockaddr_set_ipport(&remote_addr, remote_host, remote_port);
        if (ret != 0) {
            return -1;
        }
        this->remote_host = remote_host;
        this->remote_port = remote_port;
        return createsocket(&remote_addr.sa);
    }
    int createsocket(struct sockaddr* remote_addr) {
        int connfd = socket(remote_addr->sa_family, SOCK_STREAM, 0);
        // SOCKADDR_PRINT(remote_addr);
        if (connfd < 0) {
            perror("socket");
            return -2;
        }

        hio_t* io = hio_get(loop_thread.hloop(), connfd);
        assert(io != NULL);
        hio_set_peeraddr(io, remote_addr, SOCKADDR_LEN(remote_addr));
        channel.reset(new TSocketChannel(io));
        return connfd;
    }
    // closesocket thread-safe
    void closesocket() {
        setReconnect(NULL);
        if (channel) {
            channel->close(true);
        }
    }

    int startConnect() {
        assert(channel != NULL);
        if (connect_timeout) {
            channel->setConnectTimeout(connect_timeout);
        }
        if (tls) {
            channel->enableSSL();
            if (tls_setting) {
                channel->newSslCtx(tls_setting);
            }
            if (!is_ipaddr(remote_host.c_str())) {
                channel->setHostname(remote_host);
            }
        }
        channel->onconnect = [this]() {
            if (unpack_setting) {
                channel->setUnpack(unpack_setting);
            }
            channel->startRead();
            if (onConnection) {
                onConnection(channel);
            }
            if (reconn_setting) {
                reconn_setting_reset(reconn_setting);
            }
        };
        channel->onread = [this](Buffer* buf) {
            if (onMessage) {
                onMessage(channel, buf);
            }
        };
        channel->onwrite = [this](Buffer* buf) {
            if (onWriteComplete) {
                onWriteComplete(channel, buf);
            }
        };
        channel->onclose = [this]() {
            if (onConnection) {
                onConnection(channel);
            }
            // reconnect
            if (reconn_setting) {
                startReconnect();
            } else {
                channel = NULL;
                // NOTE: channel should be destroyed,
                // so in this lambda function, no code should be added below.
            }
        };
        return channel->startConnect();
    }

    int startReconnect() {
        if (!reconn_setting) return -1;
        if (!reconn_setting_can_retry(reconn_setting)) return -2;
        uint32_t delay = reconn_setting_calc_delay(reconn_setting);
        loop_thread.loop()->setTimeout(delay, [this](TimerID timerID){
            hlogi("reconnect... cnt=%d, delay=%d", reconn_setting->cur_retry_cnt, reconn_setting->cur_delay);
            if (createsocket(&remote_addr.sa) < 0) return;
            startConnect();
        });
        return 0;
    }

    void start(bool wait_threads_started = true) {
        loop_thread.start(wait_threads_started, std::bind(&TcpClientTmpl::startConnect, this));
    }
    // stop thread-safe
    void stop(bool wait_threads_stopped = true) {
        setReconnect(NULL);
        loop_thread.stop(wait_threads_stopped);
    }

    bool isConnected() {
        if (channel == NULL) return false;
        return channel->isConnected();
    }

    // send thread-safe
    int send(const void* data, int size) {
        if (!isConnected()) return -1;
        return channel->write(data, size);
    }
    int send(Buffer* buf) {
        return send(buf->data(), buf->size());
    }
    int send(const std::string& str) {
        return send(str.data(), str.size());
    }

    int withTLS(hssl_ctx_opt_t* opt = NULL) {
        tls = true;
        if (opt) {
            if (tls_setting == NULL) {
                HV_ALLOC_SIZEOF(tls_setting);
            }
            opt->endpoint = HSSL_CLIENT;
            *tls_setting = *opt;
        }
        return 0;
    }

    void setConnectTimeout(int ms) {
        connect_timeout = ms;
    }

    void setReconnect(reconn_setting_t* setting) {
        if (setting == NULL) {
            HV_FREE(reconn_setting);
            return;
        }
        if (reconn_setting == NULL) {
            HV_ALLOC_SIZEOF(reconn_setting);
        }
        *reconn_setting = *setting;
    }
    bool isReconnect() {
        return reconn_setting && reconn_setting->cur_retry_cnt > 0;
    }

    void setUnpack(unpack_setting_t* setting) {
        if (setting == NULL) {
            HV_FREE(unpack_setting);
            return;
        }
        if (unpack_setting == NULL) {
            HV_ALLOC_SIZEOF(unpack_setting);
        }
        *unpack_setting = *setting;
    }

public:
    TSocketChannelPtr       channel;

    std::string             remote_host;
    int                     remote_port;
    sockaddr_u              remote_addr;
    int                     connect_timeout;
    bool                    tls;
    hssl_ctx_opt_t*         tls_setting;
    reconn_setting_t*       reconn_setting;
    unpack_setting_t*       unpack_setting;

    // Callback
    std::function<void(const TSocketChannelPtr&)>           onConnection;
    std::function<void(const TSocketChannelPtr&, Buffer*)>  onMessage;
    // NOTE: Use Channel::isWriteComplete in onWriteComplete callback to determine whether all data has been written.
    std::function<void(const TSocketChannelPtr&, Buffer*)>  onWriteComplete;

private:
    EventLoopThread         loop_thread;
};

typedef TcpClientTmpl<SocketChannel> TcpClient;

}

#endif // HV_TCP_CLIENT_HPP_