Microservices Emulation

This program emulates a microservice in Python by creating and interacting with files. Three processes in three separate terminal windows run at the same time. Run them in this order:

1. Run prng.py
2. Run image.py
3. Run ui.py (follow instructions in this program)

Overview

To demonstrate you can implement the microservices architecture, write software comprised of three separate programs:

1. A program that generates pseudo-random numbers (PRNG Service)

2. A program that, given a non-negative integer i, returns the i^th image in a set (order doesn’t matter) (Image Service)

   • If i is >= the number of images, modulo i by the size of the image set

3. A user interface (UI) that either has a button or can receive a user command. When the button is pushed or the command is entered...

   1. UI calls the PRNG Service
   2. UI calls the Image Service using the pseudo-random number from the PRNG Service
   3. UI displays the image (or a path to it)

Use any set of images. Store images locally in a folder; no API calls needed. No DB needed.

Requirements

• UI must either have a button (if UI is graphical) or be able to receive a user command (if UI is text-based)
• Each of the three programs must run in a different process
• Programs must NOT call each other directly (e.g., do not import one program into another)
• As the communication pipe, use text files as follows:
  1. UI calls PRNG Service by writing the word "run" to prng-service.txt
  2. PRNG Service reads prng-service.txt, erases it, and writes a pseudo-random number to it
  3. UI reads prng-service.txt to get the pseudo-random number
  4. UI writes the pseudo-random number to image-service.txt
  5. Image Service reads image-service.txt, erases it, and writes an image path to it
  6. UI reads image-service.txt then displays the image (or path) to the user

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* Images by Freeimages.com