What is it

Implementation of key-value storage described in Cloud Native Go by Matthew A. Titmus

Features

• Concurrency-safe persisting storage implemented with built-in map and sync.RWMutex

• File Logger and SQLite Logger

• REST API implemented with chi

How to use

1. Install Git

2. Run git clone https://github.com/qo/keyval.git

3. Install Go

4. Run go run .

5. Access key-value storage via REST API

Route localhost:8090/v1/key/{key}:

PUT

Put value for provided key (don't forget to pass data)

GET

Get value for provided key

DELETE

Delete value for provided key

Examples with curl:

curl -X PUT -d "1" http://localhost:8090/v1/key/a - put value 1 for a key

curl -X GET http://localhost:8090/v1/key/a - get value for a key

curl -X DELETE http://localhost:8090/v1/key/a - delete value for a key

Notes

• Empty keys/values are not supported
• Make sure nothing is running on localhost:8090

Todos

Common

• Set maximum sizes for keys and values
• Create config file to store:
  • REST API port
  • log file name
  • log table name
  • names for columns of log table
  • events and errors channels capacity
• Implement Transport Layer Security
• Containerize the application

File Logger

• Come up with a better solution to process DELETE lines in log
• Close log file

SQL Logger

• Close connection with database

Bugs

Common

• Service could shut down while there are still events in the events channel

File Logger

• If keys or values contain multiple lines/spaces, bad things might happen (events are parsed with \t)

Security vulnerabilities

SQL Logger

• SQL queries are not prepared