dap_chain_node_client.c

/*
 * Authors:
 * Dmitriy A. Gearasimov <naeper@demlabs.net>
 * DeM Labs Inc.   https://demlabs.net

 This file is part of DAP (Deus Applications Prototypes) the open source project

 DAP (Deus Applicaions Prototypes) is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 DAP is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with any DAP based project.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <glib.h>
#include <time.h>

#include "dap_common.h"
#include "dap_client.h"
#include "dap_config.h"
#include "dap_events.h"
#include "dap_http_client_simple.h"
#include "dap_client_pvt.h"
#include "dap_stream_ch_pkt.h"
#include "dap_stream_ch_chain.h"
#include "dap_stream_ch_chain_pkt.h"
#include "dap_stream_ch_chain_net.h"
#include "dap_stream_ch_chain_net_pkt.h"
#include "dap_stream_pkt.h"
#include "dap_chain_node_client.h"

#define LOG_TAG "dap_chain_node_client"

#define DAP_APP_NAME NODE_NETNAME"-node"
#define SYSTEM_PREFIX "/opt/"DAP_APP_NAME
#define SYSTEM_CONFIGS_DIR SYSTEM_PREFIX"/etc"

static int listen_port_tcp = 8079;
static void s_stage_end_callback(dap_client_t *a_client, void *a_arg);
static void s_ch_chain_callback_notify_packet(dap_stream_ch_chain_t*, uint8_t a_pkt_type,
                                                      dap_stream_ch_chain_pkt_t *a_pkt, size_t a_pkt_data_size,
                                                      void * a_arg);

/**
 * @brief dap_chain_node_client_init
 * @return
 */
int dap_chain_node_client_init(void)
{
    dap_config_t *g_config;
    // read listen_port_tcp from settings
    dap_config_init(SYSTEM_CONFIGS_DIR);
    if((g_config = dap_config_open(DAP_APP_NAME)) == NULL) {
        return -1;
    }
    else {
        const char *port_str = dap_config_get_item_str(g_config, "server", "listen_port_tcp");
        listen_port_tcp = (port_str) ? atoi(port_str) : 8079;
    }
    if(g_config)
        dap_config_close(g_config);
    return 0;
}

/**
 * @brief dap_chain_node_client_deinit
 */
void dap_chain_node_client_deinit()
{
    dap_http_client_simple_deinit();
    dap_client_deinit();
}

/**
 * @brief stage_status_callback
 * @param a_client
 * @param a_arg
 */
static void stage_status_callback(dap_client_t *a_client, void *a_arg)
{
    (void) a_client;
    (void) a_arg;

    //printf("* stage_status_callback client=%x data=%x\n", a_client, a_arg);
}

/**
 * @brief s_stage_status_error_callback
 * @param a_client
 * @param a_arg
 */
static void s_stage_status_error_callback(dap_client_t *a_client, void *a_arg)
{
    (void) a_arg;
    if ( DAP_CHAIN_NODE_CLIENT(a_client)->keep_connection &&
         ( ( dap_client_get_stage(a_client) != STAGE_STREAM_STREAMING )||
           ( dap_client_get_stage_status(a_client) == STAGE_STATUS_ERROR  ) ) ){
        log_it(L_NOTICE,"Some errors happends, current state is %s but we need to return back to STAGE_STREAM_STREAMING",
                 dap_client_get_stage_str(a_client) ) ;
        dap_client_go_stage( a_client , STAGE_STREAM_STREAMING, s_stage_end_callback );
    }
    //printf("* tage_status_error_callback client=%x data=%x\n", a_client, a_arg);
}

/**
 * @brief a_stage_end_callback
 * @param a_client
 * @param a_arg
 */
static void s_stage_end_callback(dap_client_t *a_client, void *a_arg)
{
    dap_chain_node_client_t *l_node_client = a_client->_inheritor;
    assert(l_node_client);
    if(l_node_client) {
        pthread_mutex_lock(&l_node_client->wait_mutex);
        l_node_client->state = NODE_CLIENT_STATE_CONNECTED;

        dap_stream_ch_t * l_ch = dap_client_get_stream_ch( a_client , dap_stream_ch_chain_get_id() );
        if (l_ch){
            dap_stream_ch_chain_t * l_ch_chain = DAP_STREAM_CH_CHAIN(l_ch);
            l_ch_chain->notify_callback = s_ch_chain_callback_notify_packet;
            l_ch_chain->notify_callback_arg = l_node_client;
        }
        pthread_mutex_unlock(&l_node_client->wait_mutex);
        if ( l_node_client->callback_connected )
            l_node_client->callback_connected(l_node_client,a_arg);
        l_node_client->keep_connection = true;
        pthread_cond_signal(&l_node_client->wait_cond);
    }
}

/**
 * @brief s_ch_chain_callback_notify_packet
 * @param a_pkt_type
 * @param a_pkt
 * @param a_pkt_data_size
 * @param a_arg
 */
static void s_ch_chain_callback_notify_packet(dap_stream_ch_chain_t* a_ch_chain, uint8_t a_pkt_type,
                                                      dap_stream_ch_chain_pkt_t *a_pkt, size_t a_pkt_data_size,
                                                      void * a_arg)
{
    dap_chain_node_client_t * l_node_client = (dap_chain_node_client_t *) a_arg;
    switch (a_pkt_type) {
        case DAP_STREAM_CH_CHAIN_PKT_TYPE_SYNCED_ALL:
        case DAP_STREAM_CH_CHAIN_PKT_TYPE_SYNCED_GLOBAL_DB:
        case DAP_STREAM_CH_CHAIN_PKT_TYPE_SYNCED_CHAINS:{
            pthread_mutex_lock(&l_node_client->wait_mutex);
            l_node_client->state = NODE_CLIENT_STATE_SYNCED;
            pthread_mutex_unlock(&l_node_client->wait_mutex);
            pthread_cond_signal(&l_node_client->wait_cond);
        }
        default:{}
    }
}


/**
 * Create connection to server
 *
 * return a connection handle, or NULL, if an error
 */
dap_chain_node_client_t* dap_chain_node_client_connect(dap_chain_node_info_t *node_info)
{
    if(!node_info)
        return NULL;
    dap_chain_node_client_t *l_node_client = DAP_NEW_Z(dap_chain_node_client_t);
    l_node_client->state = NODE_CLIENT_STATE_INIT;
    pthread_condattr_t attr;
    pthread_condattr_init(&attr);
    pthread_condattr_setclock(&attr, CLOCK_MONOTONIC);
    pthread_cond_init(&l_node_client->wait_cond, &attr);
    pthread_mutex_init(&l_node_client->wait_mutex, NULL);
    l_node_client->events = NULL; //dap_events_new();
    l_node_client->client = dap_client_new(l_node_client->events, stage_status_callback, s_stage_status_error_callback);
    l_node_client->client->_inheritor = l_node_client;
    dap_client_set_active_channels(l_node_client->client,"NC");

    int hostlen = 128;
    char host[hostlen];
    if(node_info->hdr.ext_addr_v4.s_addr)
    {
        struct sockaddr_in sa4 = { .sin_family = AF_INET, .sin_addr = node_info->hdr.ext_addr_v4 };
        inet_ntop(AF_INET, &(((struct sockaddr_in *) &sa4)->sin_addr), host, hostlen);
    }
    else
    {
        struct sockaddr_in6 sa6 = { .sin6_family = AF_INET6, .sin6_addr = node_info->hdr.ext_addr_v6 };
        inet_ntop(AF_INET6, &(((struct sockaddr_in6 *) &sa6)->sin6_addr), host, hostlen);
    }
    // address not defined
    if(!strcmp(host, "::")) {
        dap_chain_node_client_close(l_node_client);
        return NULL;
    }
    dap_client_set_uplink(l_node_client->client, strdup(host), listen_port_tcp);
//    dap_client_stage_t a_stage_target = STAGE_ENC_INIT;
    dap_client_stage_t a_stage_target = STAGE_STREAM_STREAMING;

    l_node_client->state = NODE_CLIENT_STATE_CONNECT;
    // Handshake & connect
    dap_client_go_stage(l_node_client->client, a_stage_target, s_stage_end_callback);
    return l_node_client;
}

/**
 * Close connection to server, delete chain_node_client_t *client
 */
void dap_chain_node_client_close(dap_chain_node_client_t *a_client)
{
    if(a_client) {
        // clean client
        dap_client_delete(a_client->client);
        dap_events_delete(a_client->events);
        pthread_cond_destroy(&a_client->wait_cond);
        pthread_mutex_destroy(&a_client->wait_mutex);
        DAP_DELETE(a_client);
    }
}


/**
 * Send stream request to server
 */
int dap_chain_node_client_send_ch_pkt(dap_chain_node_client_t *a_client, uint8_t a_ch_id, uint8_t a_type,
        const void *a_pkt_data, size_t a_pkt_data_size)
{
    if(!a_client || a_client->state < NODE_CLIENT_STATE_CONNECTED)
        return -1;

//    dap_stream_t *l_stream = dap_client_get_stream(a_client->client);
    dap_stream_ch_t * l_ch = dap_client_get_stream_ch(a_client->client, a_ch_id);
    if(l_ch){
//        dap_stream_ch_chain_net_t * l_ch_chain = DAP_STREAM_CH_CHAIN_NET(l_ch);

        dap_stream_ch_pkt_write(l_ch, a_type, a_pkt_data, a_pkt_data_size);
        dap_stream_ch_set_ready_to_write(l_ch, true);
        return 0;
    }else
        return -1;
}


/**
 * wait for the complete of request
 *
 * timeout_ms timeout in milliseconds
 * waited_state state which we will wait, sample NODE_CLIENT_STATE_CONNECT or NODE_CLIENT_STATE_SENDED
 * return -1 false, 0 timeout, 1 end of connection or sending data
 */
int dap_chain_node_client_wait(dap_chain_node_client_t *a_client, int a_waited_state, int timeout_ms)
{
    int ret = -1;
    if(!a_client)
        return -1;
    pthread_mutex_lock(&a_client->wait_mutex);
    // have waited
    if(a_client->state == a_waited_state) {
        pthread_mutex_unlock(&a_client->wait_mutex);
        return 1;
    }
    // prepare for signal waiting
    struct timespec to;
    clock_gettime(CLOCK_MONOTONIC, &to);
    int64_t nsec_new = to.tv_nsec + timeout_ms * 1000000ll;
    // if the new number of nanoseconds is more than a second
    if(nsec_new > (long) 1e9) {
        to.tv_sec += nsec_new / (long) 1e9;
        to.tv_nsec = nsec_new % (long) 1e9;
    }
    else
        to.tv_nsec = (long) nsec_new;
    // signal waiting
    do {
        int wait = pthread_cond_timedwait(&a_client->wait_cond, &a_client->wait_mutex, &to);
        if(wait == 0 && a_client->state == a_waited_state) {
            ret = 1;
            break;
        }
        else if(wait == ETIMEDOUT) { // 110 260
            ret = 0;
            break;
        }
    }
    while(1);
    pthread_mutex_unlock(&a_client->wait_mutex);
    return ret;
}