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command.go
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command.go
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/*
Rating system designed to be used in VoIP Carriers World
Copyright (C) 2013 ITsysCOM
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>
*/
package console
import (
"errors"
"fmt"
"strings"
)
var (
commands = make(map[string]Commander)
)
// Console Command interface
type Commander interface {
FromArgs(args []string) error // Load data from os arguments or flag.Args()
Usage(string) string // usage message
RpcMethod() string // Method which should be called remotely
RpcParams() interface{} // Parameters to send out on rpc
RpcResult() interface{} // Only requirement is to have a String method to print on console
defaults() error // set defaults wherever necessary
}
// Process args and return right command Value or error
func GetCommandValue(args []string) (Commander, error) {
if len(args) < 2 {
return nil, errors.New("\n\tUsage: cgr-console [cfg_opts...{-h}] <command>\n")
}
cmdVal, exists := commands[args[1]]
if !exists {
var keys []string
for key, _ := range commands {
keys = append(keys, key)
}
return nil, fmt.Errorf("\n\tUsage: cgr-console [cfg_opts...{-h}] <%s>\n", strings.Join(keys, "|"))
}
if err := cmdVal.FromArgs(args); err != nil {
return nil, err
}
return cmdVal, nil
}