lexigram-notification

SMS, push, and email notification delivery with Named DI multi-backend support for the Lexigram Framework.

Overview

lexigram-notification provides a unified notification delivery system with SMS (Twilio), push (FCM, APNS), email (SMTP, SendGrid), and per-user inbox storage. The package is organized into three subpackages: root (SMS/push), mailer (email), and inbox (in-app notification storage). Root and mailer each wire their own module; the inbox is wired by InboxProvider (not a module).

Full documentation: docs.lexigram.dev

Install

uv add lexigram-notification

# With SendGrid email
uv add "lexigram-notification[sendgrid]"

# With Twilio SMS
uv add "lexigram-notification[twilio]"

# With APNS push
uv add "lexigram-notification[apns]"

Quick Start

from lexigram.di.module import Module, module
from lexigram.notification import NotificationModule
from lexigram.notification.config import (
    FCMDriverConfig,
    MailerConfig,
    NamedMailerConfig,
    NamedPushConfig,
    NamedSMSConfig,
    NotificationConfig,
    SMTPDriverConfig,
    TwilioDriverConfig,
)
from lexigram.notification.mailer import MailerModule


@module(
    imports=[
        NotificationModule.configure(
            NotificationConfig(
                sms_backends=[
                    NamedSMSConfig(
                        name="alerts",
                        primary=True,
                        driver="twilio",
                        twilio=TwilioDriverConfig(
                            account_sid="AC...",
                            auth_token="secret",
                            from_number="+15550000000",
                        ),
                    )
                ],
                push_backends=[
                    NamedPushConfig(
                        name="mobile",
                        primary=True,
                        driver="fcm",
                        fcm=FCMDriverConfig(server_key="fcm-key"),
                    )
                ],
            )
        ),
        MailerModule.configure(
            MailerConfig(
                backends=[
                    NamedMailerConfig(
                        name="transactional",
                        primary=True,
                        driver="smtp",
                        from_email="noreply@example.com",
                        smtp=SMTPDriverConfig(host="smtp.example.com", port=587),
                    )
                ]
)
    ),
]
)
class AppModule(Module):
    pass

Configuration

Zero-config usage: Call any .configure() with no arguments to use all defaults.

Option 1 — YAML file

# application.yaml
notification:
  sms_backends: []
  push_backends: []

mailer:
  backends:
    - name: transactional
      primary: true
      driver: smtp
      from_email: "noreply@example.com"
      smtp:
        host: "smtp.example.com"
        port: 587

inbox:
  store_backend: "database"
  retention_days: 30

Option 2 — Profiles + Environment Variables (recommended)

export LEX_NOTIFICATION__INBOX__STORE_BACKEND=database

Option 3 — Python

from lexigram.notification import NotificationModule
from lexigram.notification.config import (
    MailerConfig,
    NamedMailerConfig,
    NotificationConfig,
    SMTPDriverConfig,
)
from lexigram.notification.mailer import MailerModule

NotificationModule.configure(NotificationConfig())
MailerModule.configure(
    MailerConfig(
        backends=[
            NamedMailerConfig(
                name="transactional",
                primary=True,
                driver="smtp",
                from_email="noreply@example.com",
                smtp=SMTPDriverConfig(host="smtp.example.com", port=587),
            )
        ]
    )
)

Config reference

Module Factory Methods

Inbox support ships as a service (InboxService) wired by InboxProvider (in lexigram.notification.di), not by NotificationModule — include InboxProvider in your module's providers list when you need the inbox.

Admin Inbox

When running under lexigram-admin, the package registers a notification contributor (entry point lexigram.admin.contributors) that exposes:

Real-time updates: InboxService.send() fires the notification.inbox.sent action hook (constant INBOX_SENT_HOOK in lexigram-contracts); the admin realtime sub-provider forwards it to the SSE hub so open bells update live.

Key Features

• SMS delivery — Twilio backend via TwilioSMS
• Push delivery — FCM and APNS backends with send_batch() support
• Email delivery — SMTP (blocking, runs in executor) and SendGrid REST API
• Retrying mailer — wraps any MailerProtocol with exponential backoff and delivery-store tracking
• Per-user inbox — SQL or in-memory backend with InboxService (send, get_inbox, mark_read, delete, count_unread)
• Multi-backend — SMS and push backends registered by name from NotificationConfig.sms_backends / push_backends; the primary backend also receives the unnamed bindings

Testing

async with Application.boot(
    modules=[NotificationModule.stub(), MailerModule.stub()]
) as app:
    # your test code
    ...

Key Source Files