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bot.go
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bot.go
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package bot
import (
"context"
"encoding/base64"
"encoding/json"
"fmt"
"log"
"strings"
"sync"
"time"
"github.com/fox-one/mixin-sdk-go"
"github.com/gofrs/uuid"
"github.com/shopspring/decimal"
)
type Session struct {
Command string
UserID string
CurrentStep int
Data interface{}
}
type Bot struct {
client *mixin.Client
commands map[string]Command
supportedAssets map[string]string
sessionMap sync.Map
pin string
}
var commandMap = map[string]Command{}
func init() {
for _, command := range commands {
commandMap[command.Name()] = command
}
}
func Init(keystore *mixin.Keystore, pin string) (*Bot, error) {
supportedAssets, err := initAssets()
if err != nil {
return nil, err
}
client, err := mixin.NewFromKeystore(keystore)
if err != nil {
return nil, fmt.Errorf("bot: init error: %w", err)
}
return &Bot{
client: client,
commands: commandMap,
supportedAssets: supportedAssets,
pin: pin,
}, nil
}
func (b *Bot) Run(ctx context.Context) {
for {
if err := b.client.LoopBlaze(ctx, mixin.BlazeListenFunc(b.handleMessage)); err != nil {
log.Printf("LoopBlaze: %v", err)
}
select {
case <-ctx.Done():
return
case <-time.After(time.Second):
}
}
}
func (b *Bot) handleMessage(ctx context.Context, msg *mixin.MessageView, userID string) error {
if userID, _ := uuid.FromString(msg.UserID); userID == uuid.Nil {
return nil
}
data, err := base64.StdEncoding.DecodeString(msg.Data)
if err != nil {
return err
}
msg.Data = string(data)
ctx = context.WithValue(ctx, botContextKey{}, b)
if tmp, ok := b.sessionMap.Load(msg.UserID); ok {
session := tmp.(*Session)
command, ok := b.commands[session.Command]
if ok {
reply, err := command.Execute(ctx, session, msg)
return b.handleCommandResult(ctx, msg, session, reply, err)
} else {
b.sessionMap.Delete(msg.UserID)
}
} else if msg.Category == mixin.MessageCategorySystemAccountSnapshot {
reply, err := b.handleTransferMessage(ctx, msg, nil)
return b.handleCommandResult(ctx, msg, nil, reply, err)
}
if msg.Category == mixin.MessageCategoryPlainText {
msg.Data = strings.TrimSpace(msg.Data)
ss := strings.SplitN(msg.Data, " ", 2)
command, ok := b.commands[ss[0]]
if ok {
data := ""
if len(ss) > 1 {
data = ss[1]
}
msg.Data = data
session := &Session{Command: command.Name(), UserID: msg.UserID}
b.sessionMap.Store(msg.UserID, session)
reply, err := command.Execute(ctx, session, msg)
return b.handleCommandResult(ctx, msg, session, reply, err)
}
}
payload := base64.StdEncoding.EncodeToString([]byte("Unsupported command, send '/help' to get all available commands."))
id, _ := uuid.FromString(msg.MessageID)
reply := &mixin.MessageRequest{
ConversationID: msg.ConversationID,
RecipientID: msg.UserID,
MessageID: uuid.NewV5(id, "reply").String(),
Category: mixin.MessageCategoryPlainText,
Data: payload,
}
return b.client.SendMessage(ctx, reply)
}
func (b *Bot) handleTransferMessage(ctx context.Context, msg *mixin.MessageView, session *Session) (*mixin.MessageRequest, error) {
if msg.UserID == b.client.ClientID {
return nil, nil
}
var view mixin.TransferView
if err := json.Unmarshal([]byte(msg.Data), &view); err != nil {
return nil, err
}
if session == nil {
return nil, b.transferBack(ctx, msg, &view)
}
incomingAsset, err := b.client.ReadAsset(ctx, view.AssetID)
if err != nil {
return nil, err
}
targetAsset := session.Data.(*mixin.Asset)
if err := b.mtgSwap(ctx, msg.UserID, incomingAsset.AssetID, targetAsset.AssetID, view.Amount); err != nil {
return nil, err
}
replyData := fmt.Sprintf(
"%s -> %s, swap at 4swap.\nPlease check @7000103537 for swap result",
incomingAsset.Symbol, targetAsset.Symbol,
)
id, _ := uuid.FromString(msg.MessageID)
reply := &mixin.MessageRequest{
ConversationID: msg.ConversationID,
RecipientID: msg.UserID,
MessageID: uuid.NewV5(id, "reply").String(),
Category: mixin.MessageCategoryPlainText,
Data: base64.StdEncoding.EncodeToString([]byte(replyData)),
}
return reply, nil
}
func (b *Bot) transferBack(ctx context.Context, msg *mixin.MessageView, view *mixin.TransferView) error {
amount, err := decimal.NewFromString(view.Amount)
if err != nil {
return err
}
id, _ := uuid.FromString(msg.MessageID)
input := &mixin.TransferInput{
AssetID: view.AssetID,
OpponentID: msg.UserID,
Amount: amount,
TraceID: uuid.NewV5(id, "refund").String(),
Memo: "refund",
}
_, err = b.client.Transfer(ctx, input, b.pin)
return err
}
func (b *Bot) handleCommandResult(ctx context.Context, msg *mixin.MessageView, session *Session, reply *mixin.MessageRequest, err error) error {
if err != nil {
if session != nil {
b.sessionMap.Delete(session.UserID)
}
id, _ := uuid.FromString(msg.MessageID)
b.client.SendMessage(ctx, &mixin.MessageRequest{
ConversationID: msg.ConversationID,
RecipientID: msg.UserID,
MessageID: uuid.NewV5(id, "reply").String(),
Category: mixin.MessageCategoryPlainText,
Data: base64.StdEncoding.EncodeToString([]byte(err.Error())),
})
return err
}
if reply != nil {
return b.client.SendMessage(ctx, reply)
}
if session != nil && session.Command == "" {
b.sessionMap.Delete(session.UserID)
}
return nil
}