kaspad/server/rpc/handle_help.go

package rpc

import "github.com/kaspanet/kaspad/btcjson"

// handleHelp implements the help command.
func handleHelp(s *Server, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) {
	c := cmd.(*btcjson.HelpCmd)

	// Provide a usage overview of all commands when no specific command
	// was specified.
	var command string
	if c.Command != nil {
		command = *c.Command
	}
	if command == "" {
		usage, err := s.helpCacher.rpcUsage(false)
		if err != nil {
			context := "Failed to generate RPC usage"
			return nil, internalRPCError(err.Error(), context)
		}
		return usage, nil
	}

	// Check that the command asked for is supported and implemented.  Only
	// search the main list of handlers since help should not be provided
	// for commands that are unimplemented or related to wallet
	// functionality.
	if _, ok := rpcHandlers[command]; !ok {
		return nil, &btcjson.RPCError{
			Code:    btcjson.ErrRPCInvalidParameter,
			Message: "Unknown command: " + command,
		}
	}

	// Get the help for the command.
	help, err := s.helpCacher.rpcMethodHelp(command)
	if err != nil {
		context := "Failed to generate help"
		return nil, internalRPCError(err.Error(), context)
	}
	return help, nil
}