Functions

Table of Contents:

1. Tree Data Structure Functions:

   • Tree MakeNode(char *name)
   • Tree Insert(Tree parent, char *path)
   • Tree Search_Till_Parent(Tree T, char *path, int insert)
   • void PrintTree(Tree T)
   • void Del_Rec(Tree T)
   • int Delete_Path(Tree T, char *path)

2. Storage Server Functions:

   • storage_servers MakeNode_ss(char *ip_addr, int client_port, int server_port)
   • void load_SS(Tree T, char *file_name)
   • int initialize_SS(int *ss_sock)

3. File and Directory Manipulation Functions:

   • int create_file(char *file_path)
   • int create_directory(char *file_path)
   • int delete_file(char *file_path)
   • int delete_directory(char *file_path)

4. Socket and Connection Functions:

   • void connect_to_naming_server(char *ip, int *sock, struct sockaddr_in *addr)
   • void open_naming_server_port(int port_number, int *server_sock, struct sockaddr_in *server_addr)
   • void connect_to_SS_from_NS(int *ns_sock, struct sockaddr_in *ns_addr, int port_num)
   • void connect_to_SS_from_client(int *sock, struct sockaddr_in *addr, char *ns_ip, int ns_port)
   • void make_socket_non_blocking(int socket)
   • void MakeSSsend_vital(int *naming_server_sock, char *ip, int client_port, int server_port)
   • void SendInfo(int *sock, struct sockaddr_in *addr, char *path, char *op)

Tree Data Structure Functions:

Tree MakeNode(char *name)

• Description: Allocates memory for a new tree node and initializes its path and pointers.

• Parameters:

  • name: A string representing the name of the node.

• Returns: A pointer to the newly created tree node.

Tree Insert(Tree parent, char *path)

• Description: Inserts a new node with the given path as a child of the parent node.

• Parameters:

  • parent: Pointer to the parent tree node.
  • path: A string representing the path for the new node.

• Returns: Pointer to the newly inserted tree node.

Tree Search_Till_Parent(Tree T, char *path, int insert)

• Description: Searches for a node with the given path. If not found and insert is 1, it creates and inserts a new node.

• Parameters:

  • T: Pointer to the root tree node.
  • path: A string representing the path to search for.
  • insert: Integer flag (1 or 0) indicating whether to insert a new node if not found.

• Returns: Pointer to the parent node of the found/inserted node, or NULL if path not found.

void PrintTree(Tree T)

• Description: Recursively prints the tree starting from the given node.

• Parameters:

  • T: Pointer to the tree node to start printing from.

• Returns: None.

void Del_Rec(Tree T)

• Description: Recursively deletes the tree starting from the given node.

• Parameters:

  • T: Pointer to the tree node to start deletion from.

• Returns: None.

int Delete_Path(Tree T, char *path)

• Description: Deletes the node with the given path from the tree.

• Parameters:

  • T: Pointer to the root tree node.
  • path: A string representing the path to delete.

• Returns: 0 if successful, -1 if path not found.

Storage Server Functions:

storage_servers MakeNode_ss(char *ip_addr, int client_port, int server_port)

• Description: Allocates memory for a new storage server node and initializes its IP address, client port, server port, and file tree.

• Parameters:

  • ip_addr: A string representing the IP address of the storage server.
  • client_port: Integer representing the client port number.
  • server_port: Integer representing the server port number.

• Returns: Pointer to the newly created storage server node.

void load_SS(Tree T, char *file_name)

• Description: Loads storage server information from a file and constructs the file tree.

• Parameters:

  • T: Pointer to the root tree node (files and directories) of the storage server.
  • file_name: A string representing the name of the file containing storage server information.

• Returns: None.

int initialize_SS(int *ss_sock)

• Description: Initializes a storage server by receiving vital information (IP, ports, paths) from the naming server and constructs its file tree.

• Parameters:

  • ss_sock: Pointer to the storage server socket.

• Returns: 0 if successful, -1 on error.

File and Directory Manipulation Functions:

int create_file(char *file_path)

• Description: Creates a new file at the specified file path.

• Parameters:

  • file_path: A string representing the path of the file to be created.

• Returns: 0 if successful, -1 on error.

int create_directory(char *file_path)

• Description: Creates a new directory at the specified path.

• Parameters:

  • file_path: A string representing the path of the directory to be created.

• Returns: 0 if successful, -1 on error.

int delete_file(char *file_path)

• Description: Deletes the file at the specified path.

• Parameters:

  • file_path: A string representing the path of the file to be deleted.

• Returns: 0 if successful, -1 on error.

int delete_directory(char *file_path)

• Description: Deletes the directory at the specified path.

• Parameters:

  • file_path: A string representing the path of the directory to be deleted.

• Returns: 0 if successful, -1 on error.

Socket and Connection Functions:

void connect_to_naming_server(char *ip, int *sock, struct sockaddr_in *addr)

• Description: Establishes a connection to the naming server.

• Parameters:

  • ip: A string representing the IP address of the naming server.
  • sock: Pointer to the socket used for the connection.
  • addr: Pointer to the sockaddr_in structure for naming server address.

• Returns: None.

void open_naming_server_port(int port_number, int *server_sock, struct sockaddr_in *server_addr)

• Description: Opens a port for the naming server to listen to incoming connections.

• Parameters:

  • port_number: Integer representing the port number to be opened.
  • server_sock: Pointer to the socket used for the server.
  • server_addr: Pointer to the sockaddr_in structure for server address.

• Returns: None.

void connect_to_SS_from_NS(int *ns_sock, struct sockaddr_in *ns_addr, int port_num)

• Description: Establishes a connection from the naming server to a storage server.

• Parameters:

  • ns_sock: Pointer to the socket used for the connection from the naming server.
  • ns_addr: Pointer to the sockaddr_in structure for storage server address.
  • port_num: Integer representing the port number of the storage server.

• Returns: None.

void connect_to_SS_from_client(int *sock, struct sockaddr_in *addr, char *ns_ip, int ns_port)

• Description: Establishes a connection from the client to a storage server.

• Parameters:

  • sock: Pointer to the socket used for the connection.
  • addr: Pointer to the sockaddr_in structure for storage server address.
  • ns_ip: A string representing the IP address of the storage server.
  • ns_port: Integer representing the port number of the storage server.

• Returns: None.

void make_socket_non_blocking(int socket)

• Description: Configures a socket to be non-blocking.

• Parameters:

  • socket: Integer representing the socket to be configured.

• Returns: None.

`void MakeSSsend_vital(int *naming_server_sock, char *ip

, int client_port, int server_port)`

• Description: Sends vital information (IP, ports) from the storage server to the naming server.

• Parameters:

  • naming_server_sock: Pointer to the socket used for communication with the naming server.
  • ip: A string representing the IP address of the storage server.
  • client_port: Integer representing the client port number of the storage server.
  • server_port: Integer representing the server port number of the storage server.

• Returns: None.

void SendInfo(int *sock, struct sockaddr_in *addr, char *path, char *op)

• Description: Sends file or directory information from the naming server to the client or from the client to the storage server.

• Parameters:

  • sock: Pointer to the socket used for communication.
  • addr: Pointer to the sockaddr_in structure for the destination address.
  • path: A string representing the file or directory path.
  • op: A string representing the operation (get or put).

• Returns: None.