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tgbot.go
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package tgbot
import (
"context"
"errors"
"fmt"
"strings"
"sync"
tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
)
// Bot wrapper the telegram bot.
type Bot struct {
api *tgbotapi.BotAPI
// opts is bot options
opts *options
wg sync.WaitGroup
pool sync.Pool
ctx context.Context
cancel context.CancelFunc
commands map[string]*Command
updateC chan *tgbotapi.Update
}
// NewBot new a telegram bot.
func NewBot(api *tgbotapi.BotAPI, opts ...Option) *Bot {
if api == nil {
panic("tgbot: api is nil, api must be a non-nil")
}
o := newOptions(opts...)
ctx, cancel := context.WithCancel(o.ctx)
// set the updateC size for pollUpdates.
if o.bufSize == 0 {
o.bufSize = o.limit
}
return &Bot{
api: api,
opts: o,
ctx: ctx,
cancel: cancel,
updateC: make(chan *tgbotapi.Update, o.bufSize),
}
}
func (bot *Bot) allocateContextWithUpdate(update *tgbotapi.Update) (c *Context, recycle func()) {
var (
ctx = bot.ctx
cancel context.CancelFunc
)
if bot.opts.timeout > 0 {
ctx, cancel = context.WithTimeout(ctx, bot.opts.timeout)
}
recycle = func() {
if cancel != nil {
cancel()
}
c.reset()
bot.pool.Put(c)
}
if v := bot.pool.Get(); v != nil {
c = v.(*Context)
c.Context = ctx
c.update = update
return c, recycle
}
return &Context{
Context: ctx,
BotAPI: bot.api,
update: update,
}, recycle
}
type multiErr []error
func (e multiErr) Error() string {
builder := strings.Builder{}
for _, err := range e {
builder.WriteString(err.Error())
builder.WriteByte(' ')
}
return builder.String()
}
func (bot *Bot) ClearBotCommands() error {
wg := sync.WaitGroup{}
ec := make(chan error)
request := func(c tgbotapi.Chattable) {
wg.Add(1)
go func() {
defer wg.Done()
if _, err := bot.api.Request(c); err != nil {
ec <- err
}
}()
}
var errs multiErr
go func() {
for e := range ec {
errs = append(errs, e)
}
}()
request(tgbotapi.NewDeleteMyCommands())
request(tgbotapi.NewDeleteMyCommandsWithScope(tgbotapi.NewBotCommandScopeDefault()))
request(tgbotapi.NewDeleteMyCommandsWithScope(tgbotapi.NewBotCommandScopeAllPrivateChats()))
request(tgbotapi.NewDeleteMyCommandsWithScope(tgbotapi.NewBotCommandScopeAllGroupChats()))
request(tgbotapi.NewDeleteMyCommandsWithScope(tgbotapi.NewBotCommandScopeAllChatAdministrators()))
wg.Wait()
close(ec)
if errs != nil {
return errs
}
return nil
}
// AddCommands add commands to the bot.
func (bot *Bot) AddCommands(commands ...*Command) {
if bot.commands == nil {
bot.commands = make(map[string]*Command)
}
for _, c := range commands {
switch {
case c.Name == "":
panic("tgbot: command name must be non-empty")
case c.Description == "":
panic("tgbot: command description must be non-empty")
case c.Handler == nil:
panic("tgbot: command handler must be non-nil")
}
if _, ok := bot.commands[c.Name]; ok {
panic("duplicate command name: " + c.Name)
}
bot.commands[c.Name] = c
}
}
func (bot *Bot) Commands() map[string]*Command {
return bot.commands
}
func (bot *Bot) CommandsWithScope() map[CommandScope][]*Command {
commandGroups := make(map[CommandScope][]*Command)
for _, cmd := range bot.commands {
// process no scope command.
if len(cmd.scopes) == 0 {
commandGroups[noScope] = append(commandGroups[noScope], cmd)
continue
}
for _, scope := range cmd.scopes {
commandGroups[scope] = append(commandGroups[scope], cmd)
}
}
return commandGroups
}
func (bot *Bot) setupCommands() error {
if bot.opts.disableAutoSetupCommands {
return nil
}
for scope, commands := range bot.CommandsWithScope() {
botCommands := make([]tgbotapi.BotCommand, 0, len(commands))
for _, cmd := range commands {
if cmd.hide {
continue
}
botCommands = append(botCommands, tgbotapi.BotCommand{
Command: cmd.Name,
Description: cmd.Description,
})
}
if len(botCommands) == 0 {
continue
}
cmd := tgbotapi.NewSetMyCommands(botCommands...)
if scope != nil && scope != noScope {
cmd = tgbotapi.NewSetMyCommandsWithScopeAndLanguage(tgbotapi.BotCommandScope{
Type: scope.Type(),
ChatID: scope.ChatID(),
UserID: scope.UserID(),
}, scope.LanguageCode(), botCommands...)
}
if _, err := bot.api.Request(cmd); err != nil {
return err
}
}
return nil
}
func (bot *Bot) makeUpdateHandler(update *tgbotapi.Update) func() {
return func() {
ctx, recycle := bot.allocateContextWithUpdate(update)
defer recycle()
if bot.opts.panicHandler != nil {
defer func() {
if e := recover(); e != nil {
bot.opts.panicHandler(ctx, e)
}
}()
}
switch {
case bot.commands != nil && ctx.IsCommand():
bot.commandHandler(ctx)
default:
bot.updatesHandler(ctx)
}
}
}
func (bot *Bot) handleUpdate(update *tgbotapi.Update) {
updateHandler := bot.makeUpdateHandler(update)
if bot.opts.workersPool != nil && !bot.opts.workersPool.IsClosed() {
if err := bot.opts.workersPool.Go(updateHandler); err != nil {
bot.opts.errHandler(err)
}
return
}
// unlimited number of workers.
if bot.opts.workersNum <= 0 {
go updateHandler()
return
}
updateHandler()
}
func (bot *Bot) commandHandler(ctx *Context) {
handler := bot.undefinedCmdHandler
if cmd, ok := bot.commands[ctx.Command()]; ok {
handler = cmd.Handler
}
if err := handler(ctx); err != nil {
bot.opts.errHandler(err)
}
}
func (bot *Bot) updatesHandler(ctx *Context) {
if bot.opts.updatesHandler == nil {
return
}
bot.opts.updatesHandler(ctx)
}
func (bot *Bot) undefinedCmdHandler(ctx *Context) error {
if bot.opts.undefinedCommandHandler != nil {
return bot.opts.undefinedCommandHandler(ctx)
}
return ctx.ReplyText("Unrecognized command!!!")
}
func (bot *Bot) startWorker() {
defer bot.wg.Done()
for {
select {
case <-bot.ctx.Done():
return
case update := <-bot.updateC:
bot.handleUpdate(update)
}
}
}
func (bot *Bot) startWorkers() {
workNum := bot.opts.workersNum
if workNum <= 0 {
workNum = 1
}
for i := 0; i < workNum; i++ {
bot.wg.Add(1)
go bot.startWorker()
}
}
func (bot *Bot) startPollUpdates() {
bot.wg.Add(1)
go bot.pollUpdates()
}
func (bot *Bot) hijackAPI() *tgbotapi.BotAPI {
// clone a api and hijack the client.
api := new(tgbotapi.BotAPI)
*api = *bot.api
api.Client = &client{cli: bot.api.Client, ctx: bot.ctx}
return api
}
func (bot *Bot) pollUpdates() {
defer func() {
bot.wg.Done()
close(bot.updateC)
}()
api := bot.hijackAPI()
for {
select {
case <-bot.ctx.Done():
return
default:
}
updates, err := api.GetUpdates(tgbotapi.UpdateConfig{
Limit: bot.opts.limit,
Offset: bot.opts.offset,
Timeout: bot.opts.updateTimeout,
AllowedUpdates: bot.opts.allowedUpdates,
})
if err != nil {
if errors.Is(err, context.Canceled) {
return
}
bot.opts.pollUpdatesErrorHandler(err)
continue
}
for _, update := range updates {
if update.UpdateID >= bot.opts.offset {
bot.opts.offset = update.UpdateID + 1
bot.updateC <- &update
}
}
}
}
func (bot *Bot) Run() error {
// setup bot commands.
if err := bot.setupCommands(); err != nil {
return fmt.Errorf("failed to setup commands, error: %w", err)
}
// start the worker.
bot.startWorkers()
// start poll updates.
bot.startPollUpdates()
// wait all worker done.
bot.wg.Wait()
return nil
}
func (bot *Bot) Stop() context.Context {
bot.cancel()
if !bot.opts.disableHandleAllUpdateOnStop {
// must be processed until all updates are processed.
for update := range bot.updateC {
bot.wg.Add(1)
go func(update *tgbotapi.Update) {
defer bot.wg.Done()
bot.makeUpdateHandler(update)()
}(update)
}
}
ctx, cancel := context.WithCancel(context.Background())
go func() {
bot.wg.Wait()
cancel()
}()
return ctx
}