How Does the Microservice Work?

1. You must first have a CSV file in the format x, y\nx, y\n etc.

2. Then, call the microservice by connecting a socket to it at port 54338

3. Then, send the size of the csv file you'll be sending with:

   socket.sendall(len(data).to_bytes(8, byteorder='big'))

4. Then, send the file like this:

   socketock.sendall(data)

5. The graphing microservice will then create a pdf of a graph of the data you sent it, and send that pdf back as a byte stream.

6. To recieve the data call like this:

   Get the size of the pdf we'll be recieving:

   size = int.from_bytes(receive_size(socket, 8), byteorder='big')

   Recieve that many bytes from the socket:

   pdf_bytes = receive_size(socket, size)

   Open a pdf file with a specified filename for writing (filename can be whatever you want):

   pdf_file = open(filename, "wb")

   Seek to zero and truncate the file:

   pdf_file.seek(0)
   pdf_file.truncate()

   Write the bytes recieved into the file:

   pdf_file.write(pdf_bytes)

   Close the file (you're done):

   pdf_file.close()

receive_size() should be a function defined to recieve a certain number of bytes of data from a socket.

---

REQUEST	Send a CSV file to the socket at port 54338
RECEIVE	Recieve the pdf as a byte stream and then write those bytes to created pdf file

---

Pros

• Easy to request data (you only need to send the file size, then the data)
• Simple CSV format for input.
• Because it uses sockets, it's very fast.

Cons

• Only supports graphs with a single line.
• You must implement writing to a pdf yourself.
• The microservice can only handle one process at a time.

UML Sequence Diagram: