A simple key-value in memory database written in golang using custom protocol for client/server communication.

The motivation behind this project is learning how to make custom protocols and golang.

CONN

A client can connect to the server using the CONN command. It takes the name of the database as an required argument.

Syntax:

CONN <db_name>

If the database doesn't exist, one is simply created.

CREATE

Create an entry(key/value) pair to the database. It takes the key name, follwed by the value length and the value to be stored.

CREATE <key-name> <length>\r\n[value]

where:

• key-name: Is the key
• length: Length of value
• value: Value to be stored in db

READ

Read a value from the database. The server will reply with the value associated with the key.

READ <key-name>

UPDATE

Update a value of a key in database. The server will reply with OK if value is successfully updated or ERR with error message if no key with given name is found or any error in server.

UPDATE <key-name> <length>\r\n[value]

where:

• key-name: Name of key
• length: Length of value
• value: Value to be updated

DELETE

Delete a key from the database. The server will reply with OK if value is successfully deleted or if the key doesn't exists.

DELETE <key-name>

OK/ERR

When a server recieves a command it can either reply with OK or ERR

OK doesn't have any text after it.

ERR <error-message> if the format of the errors returned by the server. A server will not close connection in case of ERR

CLOSECONN

Close a connection with exisitng database and server.

Syntax:

CLOSECONN

1. Custom protocol design