forked from beego/beego
/
command.go
87 lines (72 loc) · 2.18 KB
/
command.go
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// Copyright 2020
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package admin
import (
"github.com/pkg/errors"
)
// Command is an experimental interface
// We try to use this to decouple modules
// All other modules depends on this, and they register the command they support
// We may change the API in the future, so be careful about this.
type Command interface {
Execute(params ...interface{}) *Result
}
var CommandNotFound = errors.New("Command not found")
type Result struct {
// Status is the same as http.Status
Status int
Error error
Content interface{}
}
func (r *Result) IsSuccess() bool {
return r.Status >= 200 && r.Status < 300
}
// CommandRegistry stores all commands
// name => command
type moduleCommands map[string]Command
// Get returns command with the name
func (m moduleCommands) Get(name string) Command {
c, ok := m[name]
if ok {
return c
}
return &doNothingCommand{}
}
// module name => moduleCommand
type commandRegistry map[string]moduleCommands
// Get returns module's commands
func (c commandRegistry) Get(moduleName string) moduleCommands {
if mcs, ok := c[moduleName]; ok {
return mcs
}
res := make(moduleCommands)
c[moduleName] = res
return res
}
var cmdRegistry = make(commandRegistry)
// RegisterCommand is not thread-safe
// do not use it in concurrent case
func RegisterCommand(module string, commandName string, command Command) {
cmdRegistry.Get(module)[commandName] = command
}
func GetCommand(module string, cmdName string) Command {
return cmdRegistry.Get(module).Get(cmdName)
}
type doNothingCommand struct{}
func (d *doNothingCommand) Execute(params ...interface{}) *Result {
return &Result{
Status: 404,
Error: CommandNotFound,
}
}