v1.0.0 beta 18

bot.go

@@ -163,7 +163,7 @@ func LoadPrefixesFromEnv() []string {
 //	bot := NewBot[MyDB](opts).DatabaseContext(&myDB)
 //
 // Use NoDB if no database is needed.
-type DbContext interface{}
+type DbContext any
 
 // NoDB is a placeholder type for bots that do not use a database.
 // Use Bot[NoDB] to indicate no dependency injection is required.
@@ -599,12 +599,18 @@ func (bot *Bot[T]) RunWithContext(ctx context.Context) {
 		return
 	}
 
-	bot.ExecRunners()
+	bot.ExecRunners(ctx)
 
 	bot.logger.Infoln("Bot running. Press CTRL+C to exit.")
 
 	// Start update polling in a goroutine
 	go func() {
+		defer func() {
+			if r := recover(); r != nil {
+				bot.logger.Errorln(fmt.Sprintf("panic in update polling: %v", r))
+			}
+			close(bot.updateQueue)
+		}()
 		for {
 			select {
 			case <-ctx.Done():
@@ -618,6 +624,7 @@ func (bot *Bot[T]) RunWithContext(ctx context.Context) {
 				}
 
 				for _, u := range updates {
+					u := u // copy loop variable to avoid race condition
 					select {
 					case bot.updateQueue <- &u:
 					case <-ctx.Done():
@@ -631,11 +638,12 @@ func (bot *Bot[T]) RunWithContext(ctx context.Context) {
 	// Start worker pool for concurrent update handling
 	pool := pond.NewPool(16)
 	for update := range bot.updateQueue {
-		update := update // capture loop variable
+		u := update // capture loop variable
 		pool.Submit(func() {
-			bot.handle(update)
+			bot.handle(u)
 		})
 	}
+	pool.Stop() // Wait for all tasks to complete and stop the pool
 }
 
 // Run starts the bot using a background context.

cmd_generator.go

@@ -41,6 +41,8 @@ var ErrTooManyCommands = errors.New("too many commands. max 100")
 //
 //	Command{command: "start", description: "Start the bot", args: []Arg{{text: "name", required: false}}}
 //	→ Description: "Start the bot. Usage: /start [name]"
+//	Command{command: "echo", description: "Echo user input", args: []Arg{{text: "name", required: true}}}
+//	→ Description: "Echo user input. Usage: /echo <input>"
 func generateBotCommand[T any](cmd *Command[T]) tgapi.BotCommand {
 	desc := ""
 	if len(cmd.description) > 0 {
@@ -50,16 +52,15 @@ func generateBotCommand[T any](cmd *Command[T]) tgapi.BotCommand {
 	var descArgs []string
 	for _, a := range cmd.args {
 		if a.required {
-			descArgs = append(descArgs, a.text)
+			descArgs = append(descArgs, fmt.Sprintf("<%s>", a.text))
 		} else {
 			descArgs = append(descArgs, fmt.Sprintf("[%s]", a.text))
 		}
 	}
 
+	usage := fmt.Sprintf("Usage: /%s %s", cmd.command, strings.Join(descArgs, " "))
 	if desc != "" {
-		desc = fmt.Sprintf("%s. Usage: /%s %s", desc, cmd.command, strings.Join(descArgs, " "))
-	} else {
-		desc = fmt.Sprintf("Usage: /%s %s", cmd.command, strings.Join(descArgs, " "))
+		desc = fmt.Sprintf("%s. %s", desc, usage)
 	}
 	return tgapi.BotCommand{Command: cmd.command, Description: desc}
 }

drafts.go

@@ -30,6 +30,7 @@ package laniakea
 
 import (
 	"math/rand/v2"
+	"sync"
 	"sync/atomic"
 
 	"git.nix13.pw/scuroneko/laniakea/tgapi"
@@ -68,6 +69,7 @@ func (g *LinearDraftIdGenerator) Next() uint64 {
 // DraftProvider is NOT thread-safe. Concurrent access from multiple goroutines
 // requires external synchronization.
 type DraftProvider struct {
+	mu        sync.RWMutex
 	api       *tgapi.API
 	drafts    map[uint64]*Draft
 	generator draftIdGenerator
@@ -139,6 +141,8 @@ func (p *DraftProvider) SetEntities(entities []tgapi.MessageEntity) *DraftProvid
 //
 // Returns the draft and true if found, or nil and false if not found.
 func (p *DraftProvider) GetDraft(id uint64) (*Draft, bool) {
+	p.mu.RLock()
+	defer p.mu.RUnlock()
 	draft, ok := p.drafts[id]
 	return draft, ok
 }
@@ -150,8 +154,15 @@ func (p *DraftProvider) GetDraft(id uint64) (*Draft, bool) {
 //
 // After successful flush, each draft is removed from the provider and cleared.
 func (p *DraftProvider) FlushAll() error {
-	var lastErr error
+	p.mu.RLock()
+	drafts := make([]*Draft, 0, len(p.drafts))
 	for _, draft := range p.drafts {
+		drafts = append(drafts, draft)
+	}
+	p.mu.RUnlock()
+
+	var lastErr error
+	for _, draft := range drafts {
 		if err := draft.Flush(); err != nil {
 			lastErr = err
 			break // Stop on first error to avoid partial state
@@ -201,7 +212,9 @@ func (p *DraftProvider) NewDraft(parseMode tgapi.ParseMode) *Draft {
 		ID:              id,
 		Message:         "",
 	}
+	p.mu.Lock()
 	p.drafts[id] = draft
+	p.mu.Unlock()
 	return draft
 }
 
@@ -253,7 +266,9 @@ func (d *Draft) Clear() {
 // want to cancel a draft without sending it.
 func (d *Draft) Delete() {
 	if d.provider != nil {
+		d.provider.mu.Lock()
 		delete(d.provider.drafts, d.ID)
+		d.provider.mu.Unlock()
 	}
 	d.Clear()
 }

handler.go

@@ -4,6 +4,7 @@ import (
 	"encoding/base64"
 	"encoding/json"
 	"errors"
+	"fmt"
 	"strings"
 
 	"git.nix13.pw/scuroneko/laniakea/tgapi"
@@ -12,6 +13,12 @@ import (
 var ErrInvalidPayloadType = errors.New("invalid payload type")
 
 func (bot *Bot[T]) handle(u *tgapi.Update) {
+	defer func() {
+		if r := recover(); r != nil {
+			bot.logger.Errorln(fmt.Sprintf("panic in handle: %v", r))
+		}
+	}()
+
 	ctx := &MsgContext{
 		Update: *u, Api: bot.api,
 		botLogger:     bot.logger,
@@ -84,7 +91,7 @@ func (bot *Bot[T]) handleMessage(update *tgapi.Update, ctx *MsgContext) {
 			if !plugin.executeMiddlewares(ctx, bot.dbContext) {
 				return
 			}
-			go plugin.executeCmd(cmd, ctx, bot.dbContext)
+			plugin.executeCmd(cmd, ctx, bot.dbContext)
 			return
 		}
 	}
@@ -113,7 +120,7 @@ func (bot *Bot[T]) handleCallback(update *tgapi.Update, ctx *MsgContext) {
 		if !plugin.executeMiddlewares(ctx, bot.dbContext) {
 			return
 		}
-		go plugin.executePayload(data.Command, ctx, bot.dbContext)
+		plugin.executePayload(data.Command, ctx, bot.dbContext)
 		return
 	}
 }

msg_context.go

@@ -22,6 +22,7 @@ package laniakea
 import (
 	"context"
 	"fmt"
+	"time"
 
 	"git.nix13.pw/scuroneko/laniakea/tgapi"
 	"git.nix13.pw/scuroneko/slog"
@@ -32,9 +33,11 @@ import (
 // manage inline keyboards and message drafts.
 type MsgContext struct {
 	Api    *tgapi.API
-	Msg             *tgapi.Message
 	Update tgapi.Update
+
+	Msg  *tgapi.Message
 	From *tgapi.User
+
 	CallbackMsgId   int
 	CallbackQueryId string
 	FromID          int
@@ -385,7 +388,13 @@ func (ctx *MsgContext) error(err error) {
 func (ctx *MsgContext) Error(err error) { ctx.error(err) }
 
 func (ctx *MsgContext) newDraft(parseMode tgapi.ParseMode) *Draft {
-	c := context.Background()
+	if ctx.Msg == nil {
+		ctx.botLogger.Errorln("can't create draft: ctx.Msg is nil")
+		return nil
+	}
+
+	c, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
 	if err := ctx.Api.Limiter.Wait(c, ctx.Msg.Chat.ID); err != nil {
 		ctx.botLogger.Errorln(err)
 		return nil

plugins.go

@@ -33,11 +33,14 @@ const (
 	CommandValueAnyType CommandValueType = "any"
 )
 
-// CommandRegexInt matches one or more digits.
-var CommandRegexInt = regexp.MustCompile(`\d+`)
-
-// CommandRegexString matches any non-empty string.
-var CommandRegexString = regexp.MustCompile(".+")
+var (
+	// CommandRegexInt matches one or more digits.
+	CommandRegexInt = regexp.MustCompile(`\d+`)
+	// CommandRegexString matches any non-empty string.
+	CommandRegexString = regexp.MustCompile(`.+`)
+	// CommandRegexBool matches true or false
+	CommandRegexBool = regexp.MustCompile(`true|false`)
+)
 
 // ErrCmdArgCountMismatch is returned when the number of provided arguments
 // is less than the number of required arguments.
@@ -58,15 +61,22 @@ type CommandArg struct {
 // NewCommandArg creates a new CommandArg with the given text and type.
 // Uses a default regex based on the type (string or int).
 // For CommandValueAnyType, no validation is performed.
-func NewCommandArg(text string, valueType CommandValueType) *CommandArg {
+func NewCommandArg(text string) *CommandArg {
+	return &CommandArg{CommandValueAnyType, text, CommandRegexString, false}
+}
+
+func (c *CommandArg) SetValueType(t CommandValueType) *CommandArg {
 	regex := CommandRegexString
-	switch valueType {
+	switch t {
 	case CommandValueIntType:
 		regex = CommandRegexInt
+	case CommandValueBoolType:
+		regex = CommandRegexBool
 	case CommandValueAnyType:
 		regex = nil // Skip validation
 	}
-	return &CommandArg{valueType, text, regex, false}
+	c.regex = regex
+	return c
 }
 
 // SetRequired marks this argument as required.
@@ -320,7 +330,10 @@ func (m *Middleware[T]) SetAsync(async bool) *Middleware[T] {
 // Otherwise, returns the result of the executor.
 func (m *Middleware[T]) Execute(ctx *MsgContext, db *T) bool {
 	if m.async {
-		go m.executor(ctx, db)
+		ctx := *ctx // copy context to avoid race condition
+		go func(ctx MsgContext) {
+			m.executor(&ctx, db)
+		}(ctx)
 		return true
 	}
 	return m.executor(ctx, db)

runners.go

@@ -11,6 +11,7 @@
 package laniakea
 
 import (
+	"context"
 	"time"
 )
 
@@ -83,7 +84,7 @@ func (r *Runner[T]) Timeout(timeout time.Duration) *Runner[T] {
 	return r
 }
 
-// ExecRunners executes all runners registered on the Bot.
+// ExecRunners executes all runners registered on the Bot with context-based lifecycle management.
 //
 // It logs warnings for misconfigured runners:
 //   - Sync, non-onetime runners are skipped (invalid configuration).
@@ -92,11 +93,13 @@ func (r *Runner[T]) Timeout(timeout time.Duration) *Runner[T] {
 // Execution logic:
 //   - onetime + async: Runs once in a goroutine.
 //   - onetime + sync:  Runs once synchronously; warns if slower than 2 seconds.
-//   - !onetime + async: Runs in an infinite loop with timeout between iterations.
+//   - !onetime + async: Runs in a loop with timeout between iterations until ctx.Done().
 //   - !onetime + sync: Skipped with warning.
 //
-// This method is typically called once during bot startup.
-func (bot *Bot[T]) ExecRunners() {
+// Background runners listen for ctx.Done() and gracefully shut down when the context is canceled.
+//
+// This method is typically called once during bot startup in RunWithContext.
+func (bot *Bot[T]) ExecRunners(ctx context.Context) {
 	bot.logger.Infoln("Executing runners...")
 	for _, runner := range bot.runners {
 		// Validate configuration
@@ -128,14 +131,20 @@ func (bot *Bot[T]) ExecRunners() {
 				bot.logger.Warnf("Runner %s too slow. Elapsed time %v >= 2s\n", runner.name, elapsed)
 			}
 		} else if !runner.onetime && runner.async {
-			// Background loop: periodic execution
+			// Background loop: periodic execution with graceful shutdown
 			go func(r Runner[T]) {
+				ticker := time.NewTicker(r.timeout)
+				defer ticker.Stop()
 				for {
+					select {
+					case <-ctx.Done():
+						return
+					case <-ticker.C:
 						err := r.fn(bot)
 						if err != nil {
 							bot.logger.Warnf("Runner %s failed: %s\n", r.name, err)
 						}
-					time.Sleep(r.timeout)
+					}
 				}
 			}(runner)
 		}

utils/limiter.go

@@ -193,8 +193,10 @@ func (rl *RateLimiter) waitForChatUnlock(ctx context.Context, chatID int64) erro
 
 // getChatLimiter returns the rate limiter for the given chat, creating it if needed.
 // Uses 1 request per second with burst of 1 — conservative for per-user limits.
-// Must be called with rl.chatMu held.
 func (rl *RateLimiter) getChatLimiter(chatID int64) *rate.Limiter {
+	rl.chatMu.Lock()
+	defer rl.chatMu.Unlock()
+
 	if lim, ok := rl.chatLimiters[chatID]; ok {
 		return lim
 	}

utils/version.go

@@ -1,9 +1,9 @@
 package utils
 
 const (
-	VersionString = "1.0.0-beta.17"
+	VersionString = "1.0.0-beta.18"
 	VersionMajor  = 1
 	VersionMinor  = 0
 	VersionPatch  = 0
-	VersionBeta   = 17
+	VersionBeta   = 18
 )