Redis Clone

Functionality

Notes:

• In the example below I am using redis-cli and regular strings to simply explain logic. In the app itself the RESP protocol is being used for communication
• Redis command names are case-insensitive, so ECHO, echo and EcHo are all valid commands.

1. PING - for checking health. Supposed to return "PONG" as response

  $ redis-cli PING
  PONG

2. ECHO - returns same message that was sent

  $ redis-cli echo message
  message

• Note: if echo receives more than one word it will return an error

  $ redis-cli echo some message 
  Wrong number of arguments for 'ECHO' command

3. SET - command used to set a key to a value. Can accept px argument which is a keyword for expiry. The value is passed of expire is passed in milliseconds

  $ redis-cli set foo bar 

Or set expiration to be 100 milliseconds

  $ redis-cli set foo bar px 100 

4. GET - command used for getting a value with key. Returns null bulk string in case if it's not set or expired

  $ redis-cli set foo bar
  $ redis-cli get foo
  bar