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socket editor

server connects with multiple clients with select

  1. On connection server sends successful connection message
  2. client processes each and every command with a check_command function to check if the command format is right.
  3. server processes each command by a relay of messages of sending actual information and acknowledgement messages with client. In the client side client only checks if a acknowledge message is recieved and prints a successful command message.
  4. This also helps server to send error messages during acknowledgement and to send successful command messages.
  5. The server file upload is limited to 1024 lines per line of file.
  6. each files that has been uploaded to the server is kept at a designated folder called server_files, server program at each initiation checks if the server_files directory exists or not and keeps each file with the same name in that directory.
  7. for multiple clients to send invites a child process waits for message from server and keeps on asking for input from client on invite answer until a proper "yes/no".
  8. for client ids server side keeps an array of string "client_ids" to keep ids saved, each id is generated 5 digit long random number string.
  9. each file uploaded server keeps an extra file with all the information about the file with the name suffixed with "perm_". informations are in order filename, no of lines, owner, list of collaborators with permission.
  10. For invitation each invitation server sends a request to the respective client at the moment any invitation comes to the server. server then waits for the respective client to send a definitive answer then server change the permission of the file and sends results to the owner.
  11. on upload server creates a permission file(containing filename, no of lines, and collaborators) and edits a user file named with "client_ids" to store the file names the user will upload.

For all other commands:

  1. /users: View all active clients lists with numbered according to the server

  2. /files: View all files that have been uploaded to the server, along with all details (owners, collaborators, permissions and the no. of lines in the file).

  3. /upload : Upload the local file filename to the server

  4. /download : Download the server file filename to the client, if given client has permission to access that file

  5. /invite <client_id> : Invite client client_id to join as collaborator for file filename (should already be present on server). permission can be either of V/E signifying viewer/editor.

  6. /read <start_idx> <end_idx>: Read from file filename starting from line index start_idx to end_idx . If only one index is specified, read that line. If none are specified, read the entire file.

  7. /insert “”: Write message at the line number specified by idx into file filename . If idx is not specified, insert at the end. Quotes around the message to demarcate it from the other fields.

  8. /delete <start_idx> <end_idx>: Delete lines starting from line index start_idx to end_idx from file filename. If only one index is specified, delete that line. If none are specified, delete the entire contents of the file.

  9. /exit: Disconnects from the server, and then all files which this client owned should be deleted at the server, and update the permission file.

    run server file with "g++ server.cpp -o server && ./server" run the client using "g++ client.cpp -o client && ./client"