tcp-topics's Introduction
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SOLVE ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SERVER: (tools) map<string, int> client_sockets ---> each client: his socket map<string, bool> client_active ---> each client: is connected or not map<string, vector <message>> client_messages ---> each client: his sf missed messages map<string, vector <string>> client_topics ---> each topic: his subscribers map<pair<string, string>, bool> client_sf ---> each <topic, client>: is sf or not (logic) 1.) subscriber tries to connect, accept and wait his registration message 2.) subscriber sent registration message, take his id, mark him as active in client_active, register his sockfd in client_sockets, and sent him all the messages from client_messages (sf missed messages) 3.) subscriber sent subscription message, take topic and sf and assign him in client_topics and client_sf 4.) subscriber send unsubscription message, take topic and remove him from client_topics and if case, client_sf 5.) subscriber sent disconnect message, mark him as offline in client_active and clear his sockfd from client_sockets and from set 6.) udp client sent a message, take topic, check for all the subscribers from that topic in client_topics and it they are active : 6.1) client = active ==> send message 6.2) client = inactive, but is sf ==> enqueue message using client_active and client_sf 7.) user wrote "exit", send a message to each clients to annouce them that server is going to shutdown, close all connection and program TCP_CLIENT: (tools) - when program start, connect and send a registration type message to server to annouce him about your identity (id), to be supervised (logic) 1.) server sent message, check if message is type disconnect or udp_news: 1.1) message = type_disconnect ==> close connection, exit 1.2) message = udp_news ==> format and print news 2.) user type "subscribe", send a subsbcribe type message to server 3.) user type "unsubscribe", send a unsubsbcribe type message to server 4.) user type "exit", annouce server about disconnection and close ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PROBLEMS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1.) fgets mess up the null terminator <==> put a '|' on the last character and parsed with strtok(char *, " |") 2.) user "char *" as key for maps, sometimes map["topic"] = value1, sometimes map["topic"] = value2, even if key is the same <==> used "std::string" instead of "char *" 3.) even if maps were objects, sending them as parameter to function did not reflect any change <==> used &
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