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