// Main service loop of datanode
int mainLoop()
{
int server_socket = -1;
//Create a server socket and listen on it, you can implement dfs_common.c and call it here
server_socket = create_server_tcp_socket(datanode_listen_port);
assert (server_socket != INVALID_SOCKET);
// Listen to requests from the clients
for (;;)
{
struct sockaddr_in client_address;
int client_address_length = sizeof(client_address);
int client_socket = -1;
//Accept the client request
client_socket = accept(server_socket, (struct sockaddr*) &client_address, &client_address_length);
assert(client_socket != INVALID_SOCKET);
dfs_cli_dn_req_t request;
//Receive data from client_socket, and fill it to request
receive_data(client_socket, &request, sizeof(request));
requests_dispatcher(client_socket, request);
close(client_socket);
}
close(server_socket);
return 0;
}
int main(int argc, char **argv){
system("clear");
fprintf(stdout, "Server start\n");
//check parameters (Must be: port_number)
if(argc != 2){
usage(argv[0]);
}
//Init signal process
//TODO To update
sigset_t mask, oldmask;
sethandler(SIG_IGN, SIGPIPE);
//sethandler(siginthandler, SIGINT);
sigemptyset(&mask);
sigaddset(&mask, SIGINT);
//sigprocmask(SIG_BLOCK, &mask, &oldmask);
//Create the server socket, bind it, start listening
int sock = create_server_tcp_socket(atoi(argv[1]), BACKLOG);
if(sock < 0){
fprintf(stderr, "Unable to start the server (Unable to create the socket)...\n");
return EXIT_FAILURE;
}
//Initialize server data
ServerData server;
server_data_init(&server);
User *admin = user_create("admin"); //Admin user just for the default room
server_data_add_room(&server, admin, ROOM_WELCOME_NAME);
//Start listening for new clients
server_start_listening_clients(&server, sock);
//Close the socket
fprintf(stdout, "Server is closing. Close socket...\n");
if(TEMP_FAILURE_RETRY(close(sock)) < 0){
fprintf(stderr, "Error while closing the socket...\n");
return EXIT_FAILURE;
}
fprintf(stdout, "Server is stopped\n");
return EXIT_SUCCESS;
}
// main service loop of datanode
int mainLoop()
{
//we don't consider concurrent operations in this assignment
int server_socket = -1;
//TODO: create a server socket and listen on it, you can implement dfs_common.c and call it here
server_socket = create_server_tcp_socket(datanode_listen_port);
assert (server_socket != INVALID_SOCKET);
printf("dfs_datanode.c: mainloop(): Entering for loop to listen for clients. \n");
// Listen to requests from the clients
for (;;)
{
sockaddr_in client_address;
int client_socket = -1;
//TODO: accept the client request
int sin_len = sizeof(struct sockaddr_in);
// int accept (int socket, struct sockaddr *addr, socklen_t *length_ptr)
printf("dfs_datanode.c: mainloop(): Waiting to accept. \n");
client_socket = accept(server_socket, (struct sockaddr *)&client_address, &sin_len); // &sizeof?? sizeof(client_address)
assert(client_socket != INVALID_SOCKET);
dfs_cli_dn_req_t request;
//TODO: receive data from client_socket, and fill it to request
// ssize_t recv (int socket, void *buffer, size_t size, int flags)
recv(client_socket, &request, sizeof(request), MSG_WAITALL);
//printf("dfs_datanode.c: mainloop(): request.block.content: %s \n",request.block.content);
printf("dfs_datanode.c: mainloop(): Received request from client, file: %s, block_id: %i, operation: %i(0 read, 1 write). \n",
request.block.owner_name,request.block.block_id,request.op_type);
requests_dispatcher(client_socket, request);
close(client_socket);
}
close(server_socket);
return 0;
}