bomberstudent/Serveur/bomberstudent_server.c

/* 
 * File:   bomberstudent_server.c
 * Author: Arthur Brandao
 *
 * Created on 14 novembre 2018
 */

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <signal.h>
#include "arraylist.h"
#include "bomberstudent_server.h"
#include "error.h"

/* --- Globale --- */
arraylist get;
arraylist post;
char* error_code[] = {
    "520",
    "400"   
};
char* error_message[] = { 
    "Unknown error",
    "Bad Request"
};

/* --- Fonctions privées --- */

void send_err_client(int client, int error){
    JsonEncoder* je = malloc(sizeof(JsonEncoder));
    //Creation JSON
    add_string(je, "statut", error_code[error]);
    add_string(je, "message", error_message[error]);
    //Envoi
    if(!send_client(client, je)){
        adderror("Impossible d'avertir le client de l'erreur");
    }
    free(je);
}

/**
 * Thread de gestion d'un client
 * @param data
 * @return 
 */
void* client_thread(void* data) {
    int* tmp, cliId, nbError = 0;
    Client* cli;
    //Recup la valeur de data
    tmp = (int*) data;
    cliId = *tmp;
    //Recup le client
    cli = get_client(cliId);
    if (cli == NULL) {
        adderror("Le client n'existe pas");
        return NULL;
    }
    //Attente requete du client
    while (true) {
        if (!receive_client(cli)) {
            adderror("Erreur lors de la reception d'une requete du client");
            nbError++;
        } else {
            nbError = 0;
        }
        //Si trop d'erreur d'affilé
        if (nbError == NBERRORRESET) {
            //Fermeture du client et fin du thread
            adderror("Client non accessible, fin de la connexion");
            remove_client(cliId);
            break;
        }
    }
    return NULL;
}

/**
 * Thread de gestion des connexions UDP
 * @param data
 * @return 
 */
void* udp_thread(void* data) {
    Server s;
    char buffer[BUFFER_SIZE];
    //Cast data en serveur
    s = (Server) data;
    //Detache le thread
    if (pthread_detach(pthread_self()) != 0) {
        return NULL;
    }
    //Boucle attente
    while (true) {
        //Attente connexion
        if (s->server_receive(s, buffer, BUFFER_SIZE) == ERR) {
            addserror("Impossible de recevoir le demande de recherche");
            continue;
        }
        //Si la phrase est correcte
        if (strncmp(buffer, SEARCH_SERV, strlen(buffer)) == 0) {
            if (!s->server_send(s, "i'm a bomberstudent server")) {
                addserror("Impossible de repondre à la recherche");
            }
        }
    }
    return NULL;
}

/**
 * Thread de gestion des connexions TCP
 * @param data
 * @return 
 */
void* tcp_thread(void* data) {
    Server* s;
    boolean res;
    int cliId;
    pthread_t client;
    //Cast data en serveur
    s = (Server*) data;
    //Detache le thread
    if (pthread_detach(pthread_self()) != 0) {
        return NULL;
    }
    //Boucle attente
    while (true) {
        res = s[0]->server_accept(s[0]);
        res = res && s[1]->server_accept(s[1]);
        if (!res) {
            addserror("Impossible d'etablir la connexion TCP");
            continue;
        }
        //Creation d'un client et de son thread
        cliId = add_client(s[0], s[1]);
        if (pthread_create(&client, NULL, client_thread, &cliId) != 0) {
            adderror("Impossible de créer le thread CLient");
            /*ToDo Avertir Client du probleme*/
        }
    }
    return NULL;
}

/* --- Fonctions publiques --- */
void ini_server() {
    arraylist_ini(&get);
    arraylist_ini(&post);
}

void add_handler(char* method, char* ressource, int(*handler)(int, JsonParser*)) {
    if (strncmp(method, "POST", 5) == 0) {
        arraylist_add(&post, ressource, handler);
    } else if (strncmp(method, "POST", 5) == 0) {
        arraylist_add(&get, ressource, handler);
    }
}

boolean launch_udp_server(int port) {
    Server s;
    pthread_t udp;
    //Creation serveur
    s = server_create_udp();
    if (s == NULL) {
        addserror("Impossible de créer le serveur UDP");
        return false;
    }
    if (!s->server_bind(s, port)) {
        addserror("Impossible de bind le serveur UDP");
        return false;
    }
    //Lancement thread serveur udp
    if (pthread_create(&udp, NULL, udp_thread, s) != 0) {
        adderror("Impossible de créer le thread UDP");
        server_close(s);
        return false;
    }
    return true;
}

boolean launch_tcp_server(int port) {
    Server* s;
    pthread_t tcp;
    //Creation serveur
    s = malloc(sizeof (Server) * 2);
    s[0] = server_create_tcp();
    s[1] = server_create_tcp();
    if (s[0] == NULL || s[1] == NULL) {
        addserror("Impossible de créer les serveurs TCP");
        return false;
    }
    if (!(s[0]->server_bind(s[0], port) && s[1]->server_bind(s[1], port + 1))) {
        addserror("Impossible de bind les serveurs TCP");
        return false;
    }
    //Lancement Thread attente connexion TCP 
    if (pthread_create(&tcp, NULL, tcp_thread, s) != 0) {
        adderror("Impossible de créer le thread TCP");
        server_close(s[0]);
        server_close(s[1]);
        return false;
    }
    return true;
}

boolean receive_client(Client* cli) {
    char buffer[BUFFER_SIZE];
    char* reader, * ressource, * json = NULL;
    int method, pos, compteur = 0;
    JsonParser* jp = NULL;
    arraylist* al = &get;
    //Attente reception
    if (cli->main->server_receive(cli->main, buffer, BUFFER_SIZE) == ERR) {
        addserror("Impossible de recevoire les données du client");
        return false;
    }
    //Recup la methode
    if (buffer[0] == 'P') {
        pos = 5;
        reader = buffer + pos;
        method = POST;
    } else if (buffer[0] == 'G') {
        pos = 4;
        reader = buffer + pos;
        method = GET;
    } else {
        //Methode incorrect
        adderror("Methode incorrect");
        send_err_client(cli->id, EREQUEST);
        return false;
    }
    //Recup la ressource
    while (buffer[pos] != '\n' && buffer[pos] != '\0') {
        compteur++;
        pos++;
    }
    if (compteur == 0) {
        adderror("Aucune ressource demandée");
        send_err_client(cli->id, EREQUEST);
        return false;
    }
    ressource = malloc(sizeof (char) * compteur);
    strncpy(ressource, reader, compteur);
    //Recup param JSON
    if (method == POST) {
        if (buffer[pos] == '\0') {
            //Pas de parametre avec le post
            adderror("Absence de parametre en POST");
            send_err_client(cli->id, EREQUEST);
            return false;
        }
        json = reader + compteur + 1;
        jp = malloc(sizeof (JsonParser));
        if (json_parse(jp, json) != JSON_OK) {
            adderror("Impossible de parser le JSON");
            send_err_client(cli->id, EREQUEST);
            return false;
        }
        //Change la liste à utiliser
        al = &post;
    }
    //Appel le callback
    if (arraylist_call(al, ressource, cli->id, jp) == ERR) {
        adderror("Impossible d'executer le callback");
        send_err_client(cli->id, EREQUEST);
        return false;
    }
    //Nettoyage
    free(ressource);
    if(jp != NULL){
        free(jp);
    }
    return true;
}

boolean send_client(int cliId, JsonEncoder* je){
    Client* cli;
    char* answer, * msg;
    //Recup client
    cli = get_client(cliId);
    if (cli == NULL) {
        adderror("Le client n'existe pas");
        return false;
    }
    //Preparation message
    answer = json_encode(je);
    msg = malloc(sizeof(char) + (strlen(answer) + 2));
    memset(msg, 0, strlen(answer) + 2);
    sprintf(msg, "%s\n", answer);
    //Envoi la reponse
    if(!cli->main->server_send(cli->main, msg)){
        adderror("Impossible de repondre à la requete du client");
        free(answer);
        free(msg);
        return false;
    }
    //Nettoyage
    free(answer);
    free(msg);
    return true;
}

boolean notify_client(Client* cli, char* method, char* ressource, JsonEncoder* param){
    int length;
    char* answer, * msg;
    //Creation message
    answer = json_encode(param);
    length = strlen(method) + 1 + strlen(ressource) + 1 + strlen(answer) + 2;
    msg = malloc(sizeof(char) + length);
    memset(msg, 0, length);
    sprintf(msg, "%s %s\n%s\n", method, ressource, answer);
    //Envoi la reponse
    if(!cli->notify->server_send(cli->notify, msg)){
        adderror("Impossible de notifier le client");
        free(answer);
        free(msg);
        return false;
    }
    //Nettoyage
    free(answer);
    free(msg);
    return true;
}

boolean notify_all(char* method, char* ressource, JsonEncoder* param){
    Client* cli;
    boolean res = true;
    //Parcours tous les clients
    int nbClient = get_number_client();
    for(int i = 0; i < nbClient; i++){
        cli = get_client(i);
        //Si le client existe toujours
        if(cli == NULL){
            continue;
        }
        //Lui envoi le message
        res = res && notify_client(cli, method, ressource, param);
    }
    return res;
}