feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

internal/sender/telegram.go

@@ -0,0 +1,53 @@
+package sender
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"rsgit.ru/rsmon/rsmon/app/models"
+	"rsgit.ru/rsmon/rsmon/internal/tg"
+)
+
+// RunTelegram provides functionality.
+func RunTelegram(message *models.Message) error {
+	subject, _, _, _ := GetContent(message, time.Now())
+	return tg.SendMessage(message.Contact.Value, subject.String())
+}
+
+// SendTelegramWithCredential delivers a Telegram message using the given bot
+// credential. Phase 1 of docs/plans/worker-notifier-mvp.md: the worker holds
+// the credential in memory after the init/config push and passes it here.
+func SendTelegramWithCredential(chatID, subject, body string, cred *models.NotificationCredential) error {
+	return SendTelegramWithCredentialContext(context.Background(), chatID, subject, body, cred)
+}
+
+// SendTelegramWithCredentialContext prevents handoff after cancellation. The
+// tgbotapi client used by the legacy sender does not expose a context-aware
+// Send method, so an already handed-off Telegram request cannot be interrupted.
+func SendTelegramWithCredentialContext(ctx context.Context, chatID, subject, body string, cred *models.NotificationCredential) error {
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	if cred == nil {
+		return errors.New("telegram credential is nil")
+	}
+	text := subject
+	if body != "" {
+		text = subject + "\n\n" + body
+	}
+	err := sendTelegramWithBot(chatID, text, cred)
+	if ctx.Err() != nil {
+		return ctx.Err()
+	}
+	return err
+}
+
+// sendTelegramWithBot is the low-level helper that the legacy RunTelegram
+// (legacy secrets path) and SendTelegramWithCredential (worker wire path)
+// both call. It derives an http API URL from the credential's APIURL.
+func sendTelegramWithBot(chatID, text string, cred *models.NotificationCredential) error {
+	// Use a credential-scoped helper so each Telegram credential can map to a
+	// separate bot token/API URL.
+	return tg.SendMessageWithToken(chatID, text, cred)
+}