bbgo_origin/pkg/interact/interact.go

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package interact
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import (
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"context"
"fmt"
"time"
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log "github.com/sirupsen/logrus"
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)
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type CustomInteraction interface {
Commands(interact *Interact)
}
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type Initializer interface {
Initialize() error
}
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type Messenger interface {
TextMessageResponder
CommandResponder
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Start(ctx context.Context)
}
type Session interface {
ID() string
SetOriginState(state State)
GetOriginState() State
SetState(state State)
GetState() State
IsAuthorized() bool
SetAuthorized()
SetAuthorizing(b bool)
}
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// Interact implements the interaction between bot and message software.
type Interact struct {
startTime time.Time
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// commands is the default public command map
commands map[string]*Command
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// privateCommands is the private command map, need auth
privateCommands map[string]*Command
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states map[State]State
statesFunc map[State]interface{}
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customInteractions []CustomInteraction
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messengers []Messenger
}
func New() *Interact {
return &Interact{
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startTime: time.Now(),
commands: make(map[string]*Command),
privateCommands: make(map[string]*Command),
states: make(map[State]State),
statesFunc: make(map[State]interface{}),
}
}
func (it *Interact) AddCustomInteraction(custom CustomInteraction) {
custom.Commands(it)
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it.customInteractions = append(it.customInteractions, custom)
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}
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func (it *Interact) PrivateCommand(command, desc string, f interface{}) *Command {
cmd := NewCommand(command, desc, f)
it.privateCommands[command] = cmd
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return cmd
}
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func (it *Interact) Command(command string, desc string, f interface{}) *Command {
cmd := NewCommand(command, desc, f)
it.commands[command] = cmd
return cmd
}
func (it *Interact) getNextState(session Session, currentState State) (nextState State, final bool) {
var ok bool
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final = false
nextState, ok = it.states[currentState]
if ok {
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// check if it's the final state
if _, hasTransition := it.statesFunc[nextState]; !hasTransition {
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final = true
}
return nextState, final
}
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// state not found, return to the origin state
return session.GetOriginState(), final
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}
func (it *Interact) handleResponse(session Session, text string, ctxObjects ...interface{}) error {
// We only need response when executing a command
switch session.GetState() {
case StatePublic, StateAuthenticated:
return nil
}
args := parseCommand(text)
state := session.GetState()
f, ok := it.statesFunc[state]
if !ok {
return fmt.Errorf("state function of %s is not defined", state)
}
ctxObjects = append(ctxObjects, session)
_, err := ParseFuncArgsAndCall(f, args, ctxObjects...)
if err != nil {
return err
}
nextState, end := it.getNextState(session, state)
if end {
session.SetState(session.GetOriginState())
return nil
}
session.SetState(nextState)
return nil
}
func (it *Interact) getCommand(session Session, command string) (*Command, error) {
if session.IsAuthorized() {
if cmd, ok := it.privateCommands[command]; ok {
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return cmd, nil
}
} else {
if _, ok := it.privateCommands[command]; ok {
return nil, fmt.Errorf("private command can not be executed in the public mode, type /auth to get authorized")
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}
}
// find any public command
if cmd, ok := it.commands[command]; ok {
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return cmd, nil
}
return nil, fmt.Errorf("command %s not found", command)
}
func (it *Interact) runCommand(session Session, command string, args []string, ctxObjects ...interface{}) error {
cmd, err := it.getCommand(session, command)
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if err != nil {
return err
}
ctxObjects = append(ctxObjects, session)
session.SetState(cmd.initState)
if _, err := ParseFuncArgsAndCall(cmd.F, args, ctxObjects...); err != nil {
return err
}
// if we can successfully execute the command, then we can go to the next state.
state := session.GetState()
nextState, end := it.getNextState(session, state)
if end {
session.SetState(session.GetOriginState())
return nil
}
session.SetState(nextState)
return nil
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}
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func (it *Interact) AddMessenger(messenger Messenger) {
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// pass Responder function
messenger.SetTextMessageResponder(func(session Session, message string, reply Reply, ctxObjects ...interface{}) error {
return it.handleResponse(session, message, append(ctxObjects, reply)...)
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})
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it.messengers = append(it.messengers, messenger)
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}
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// builtin initializes the built-in commands
func (it *Interact) builtin() error {
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it.Command("/uptime", "show bot uptime", func(reply Reply) error {
uptime := time.Since(it.startTime)
reply.Message(fmt.Sprintf("uptime %s", uptime))
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return nil
})
return nil
}
func (it *Interact) init() error {
if err := it.builtin(); err != nil {
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return err
}
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if err := it.registerCommands(it.commands); err != nil {
return err
}
if err := it.registerCommands(it.privateCommands); err != nil {
return err
}
return nil
}
func (it *Interact) registerCommands(commands map[string]*Command) error {
for n, cmd := range commands {
for s1, s2 := range cmd.states {
if _, exist := it.states[s1]; exist {
return fmt.Errorf("state %s already exists", s1)
}
it.states[s1] = s2
}
for s, f := range cmd.statesFunc {
it.statesFunc[s] = f
}
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// register commands to the service
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if len(it.messengers) == 0 {
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return fmt.Errorf("messenger is not set")
}
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// commandName is used in the closure, we need to copy the variable
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commandName := n
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for _, messenger := range it.messengers {
messenger.AddCommand(cmd, func(session Session, message string, reply Reply, ctxObjects ...interface{}) error {
args := parseCommand(message)
return it.runCommand(session, commandName, args, append(ctxObjects, reply)...)
})
}
}
return nil
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}
func (it *Interact) Start(ctx context.Context) error {
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if len(it.messengers) == 0 {
log.Warn("messenger is not set, skip initializing")
return nil
}
if err := it.init(); err != nil {
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return err
}
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for _, custom := range it.customInteractions {
log.Infof("checking %T custom interaction...", custom)
if initializer, ok := custom.(Initializer); ok {
log.Infof("initializing %T custom interaction...", custom)
if err := initializer.Initialize(); err != nil {
return err
}
}
}
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// TODO: use go routine and context
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for _, m := range it.messengers {
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go m.Start(ctx)
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}
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return nil
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}