Sonnet Server
Domain-service foundation for Petrarca backend services. Provides the infrastructure layer that every backend service inherits: FastAPI app factory, extension-based lifecycle, database connectivity, messaging, caching, DI, readiness pipeline, guards, CLI framework, and system endpoints.
What it provides
- Extension protocol -- opt-in subsystem lifecycle (database, messaging, cache, profiles). Infrastructure and profile extensions with conditional startup and router mounting.
- Database -- engine management, ambient sessions, CRUD repository, Alembic utilities, advisory locks.
- Messaging -- content-based router with pluggable channels (Postgres
LISTEN/NOTIFY, NATS, in-process), CloudEvents envelope,
@handlesdecorator. - Cache -- managed cache with pluggable backends (local, distributed, near-cache), cross-process invalidation via messaging.
- Readiness pipeline -- composable health check stages with decorator-based auto-discovery.
- Guards -- protocol-based authentication and tenant context validation.
- DI -- type-keyed service registry with factory and singleton patterns.
- CLI -- Typer-based framework with reusable
db check/db upgradecommands. - System endpoints --
/ping,/version,/health-check, plus extension-contributed routes (/messaging,/cache).
Prerequisites
Setup
| Situation | Command |
|---|---|
| Fresh clone | task install |
After git pull (no dep changes) |
task sync |
After editing pyproject.toml |
task install |
| Upgrade deps to latest | task upgrade → commit uv.lock |
This package is part of the sonnet-server workspace. See the workspace root for setup instructions.
Development
From the package directory (packages/sonnet-server/):
task fct # format, check, test
task test # tests only
task test:unit # unit tests only
Or from the workspace root:
task fct # all packages
Consumer usage
Dependency
Add to your project's pyproject.toml:
[project]
dependencies = [
"sonnet-server[all]>=0.1.8",
]
For local co-development, add an editable source override:
[tool.uv.sources]
sonnet-server = { path = "../sonnet-server/packages/sonnet-server", editable = true }
Settings
Subclass Settings with your own env prefix. Call init_settings() at the
bottom of your settings module to register with sonnet-server:
# my_app/settings.py
from functools import lru_cache
from pydantic_settings import SettingsConfigDict
from sonnet_server.settings import Settings as SonnetSettings, init_settings
class Settings(SonnetSettings):
model_config = SettingsConfigDict(env_prefix="MY_APP_", ...)
# project-specific fields here
@lru_cache
def get_settings() -> Settings:
return Settings()
init_settings(get_settings())
All sonnet-server infrastructure (database, messaging, cache, checks) will
then read from MY_APP_* env vars.
License
Apache License 2.0. See LICENSE.md.
1 maintainer
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