Implementing a basic database that operates on key value pair as queried

For this implementation, we will be using redis cloud. This makes it usable across Linux and Windows. This can be implemented locally on a Linux system

Note: Redis is not supported by windows 10. To run on windows, you need to install Linux subsystem for windows and run it from there.

Note: Not Production Ready:

Logging will need to be removed from all try/catch blocks

Assumption:

COMPACT works for only variables intialized in the session. Any already existing data/variables won't be used.
Meaning, COMPACT lines generated will only consist of newly used variables in the current session.

Future:

MULTI functionality will require a validate fucntion that will validate all the lines before it starts running them. In current setting it will stop the program where it breaks

Note:

• Story 5 doesn't seem to be applicable for on cloud database.

Commands supported

Command Name	Function	Input	Output
SET	sets/replaces/creates a key/value pair	SET key value	True(Success)
GET	gets value if exists	GET key	Value
INCR	increments the value by 1	INCR key	Value (after increment)
INCRBY	increments the value by amount specified	INCRBY key amount	Value (after increment)
MULTI	Starts storing the commands to be executed later	MULTI	None
EXEC	Executes all commands since MULTI	EXEC	None
DISCARD	Deletes all stored commands	DISCARD	None
DEL	Deletes key and value	DEL key value	True
COMPACT	Converts all commands in session into set operation (limitations discussed above)	COMPACT	List of commands

Managing Environment

Create a env:

python -m venv myenv

Activate env:

 .\myenv\Scripts\activate

Install all required packages from requirements.txt

pip install -r requirements.txt

Note: Always update requirements.txt if new packages are installed

pip freeze > requirements.txt

Running Code

Main file

cd key_value_db
python .\main.py 

Running tests

coverage run -m pytest test/
# To generate html report
coverage html

Project Structure

/key_value_db
    Python modules
    /test
    /htmlcov
/myenv
README.md
requirementx.txt
.gitignore