• Dependencies
• Getting started
• Troubleshooting
• Task
• ToDo

• Python3.4 (or higher)
  • pytest library (if you want to run tests)
• Ruby 2.3 or 2.4
• go1.10

0. Your OS:

   • if you are not running on a GNU/Linux OS, you are on your own with debugging

1. Get the application (clone or download)

   • git clone http://github.com/mrl5/polyglot-task.git
   • download and extract
   • go to the application's directory cd polyglot-task

2. run python3 installer.py (this script will reproduce steps 2, 3, 4)

OR

2. Check for dependencies

   • Python: python --version
   • Ruby: ruby --version
   • Go: go version

3. Compile api.go

   • make sure that you are inside application's directory pwd -P | xargs basename (you should get polyglot-task )
   • go build api.go

4. Make sure that endpoint.rb, api and worker.py are executable

   • if you are running on GNU/Linux run chmod +x endpoint.rb api worker.py

5. Play around

   • you can start the program by typing ./endpoint.rb or ruby endpoint.rb

6. Logfiles will be stored in folder polyglot-task-by-JK-aka-mrl5-v20 in your user's home directory (e.g. /home/kuba/polyglot-task-by-JK-aka-mrl5-v20)

• api.go doesn't compile!
  • download the binary version from here (check go_env.txt file and check section 4 from "Getting started")
• error: sh: /home/kuba/test/polyglot-task/api: No such file or directory
  • there is no api binary file in project's directory: check sections 2 and 3 for the solution
• error: sh: /home/kuba/test/polyglot-task/api: Permission denied
  • your user has no permission to run api file: check section 4 for a solution
  • if you can't change file permission you should clone or extract the project inside your user's home directory
• "I provide valid RPN expression but I get error output"
  • if your RPN expression is valid your user has no permission to run worker.py file: check section 4 for a solution
  • if you can't change file permission you should clone or extract the project inside your user's home directory
  • if none of above works, try running python worker.py "<your RPN_expression>" (e.g. python worker.py "1 1 +") python interpreter should give you more information about what went wrong

2
3 4 +
5 1 2 + 4 * + 3 -

Where:

• N - number of input expressions to solve
• f(x1) - first RPN expression to evaluate
• f(x2) - second RPN expression to evaluate
• f(x3) - nth RPN expression to evaluate

7, 0.235
14, 0.280

Where:

• first field: evaluation result
• second field: evaluation time

1. Endpoint interface for gathering input data (stdin) and output results (stdout)
2. API for getting requests, sending to the worker and logging input and timings. Logs should be saved to a file.
3. Worker responsible for the process of calculation

• log StdErr in error.log