LAB

TCP Server / Message Application

Author: Billy Bunn

Links and Resources

• PR
• travis

Modules

app.js

Socket that makes a TCP connection with server.js on port 3001.

alterFile(file)

Calls a series of functions to read a file, convert the content to all uppercase characters, and re-write the file with the new content. Emits an event upon completing the process or a different event if an error occurs.

read(file) -> fs.readFile(file) as Promise

Calls the promisify-ed fs.readFile function. Takes a filepath to read as a parameter, ultimately returns a buffer of the data in that file.

uppercase(data) -> Buffer of data in uppercase characters

Takes buffer data as a parameter, returns a buffer of the same content in uppercase characters.

write(file, contents) -> fs.writeFile(file, contents) as Promise

Calls the promisify-ed fs.writeFile function. Takes a filepath and buffer data as parameters, ultimately writes new file with the filepath of file with the contents.

server.js

The TCP server. Accepts connections from sockets on port 3001.

dispatchEvent(json) -> broadcasts the payload of allowed events to all sockets

logger.js

Setup

• npm i - install dependencies

Running the app

• npm node app.js dummy.txt

Tests

• To run tests, enter the following in the CLI:
  • npm run test
  • npm run lint

UML

Final Diagram

Lecture Diagram