cmd_echo.go

Filename: cmd_echo.go

1. Overview

This file defines the ECHO command for the DiceDB system. The ECHO command simply returns the message that was passed to it as an argument.

2. Detailed Documentation

   cECHO

   • Purpose: Defines the metadata for the ECHO command.
   • Type: *CommandMeta
   • Fields:
     • Name: The name of the command ("ECHO").
     • Syntax: The syntax of the command ("ECHO message").
     • HelpShort: A short description of the command.
     • HelpLong: A longer description of the command.
     • Examples: Examples of how to use the command.
     • Eval: The evalECHO function to pre-evaluate the command.
     • Execute: The executeECHO function to execute the command.

   init()

   • Purpose: Registers the ECHO command with the CommandRegistry.
   • Parameters: None
   • Returns: None

   evalECHO(c *Cmd, s *dstore.Store) (*CmdRes, error)

   • Purpose: Evaluates the ECHO command and constructs the response.
   • Parameters:
     • c: A pointer to the Cmd struct representing the command.
     • s: A pointer to the dstore.Store struct representing the data store.
   • Returns:
     • *CmdRes: A pointer to the CmdRes struct containing the response.
     • error: An error if the number of arguments is incorrect.

   type Cmd struct {
   	C *Command
   }
   
   type CmdRes struct {
   	R *wire.Response
   }

   executeECHO(c *Cmd, sm *shardmanager.ShardManager) (*CmdRes, error)

   • Purpose: Executes the ECHO command within a shard.
   • Parameters:
     • c: A pointer to the Cmd struct representing the command.
     • sm: A pointer to the shardmanager.ShardManager struct.
   • Returns:
     • *CmdRes: A pointer to the CmdRes struct containing the response.
     • error: An error if one occurs during evaluation.

3. Code Examples

   None

4. Getting Started Relevance