openframe-adapters-db-mongo 1.1.0

OpenFrame Microservice Suite — MongoDB document store adapter.

openframe-adapters-db-mongo

MongoDB document store adapter for the OpenFrame Microservice Suite.

Part of the openframe-adapters monorepo. Implements BaseRepository[T] and HealthCheck from openframe-core using motor (AsyncIOMotorClient).

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Installation

pip install openframe-adapters-db-mongo

Required env vars:

MONGO_URL=mongodb://user:password@host:27017
MONGO_DATABASE=mydb

Atlas SRV URIs work too:

MONGO_URL=mongodb+srv://user:[e-mail]

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Quick start

Raw dict mode

from openframe.adapters.db.mongo import MongoSettings, MongoRepository

settings = MongoSettings()  # reads MONGO_URL and MONGO_DATABASE from env
repo = MongoRepository(settings, collection="artifacts")

doc = await repo.get("507f1f77bcf86cd799439011")   # dict | None
docs, total = await repo.list(10, 0)                # ([dict, ...], int)
created = await repo.create({"title": "paper"})
updated = await repo.update({"_id": "...", "title": "updated"})
deleted = await repo.delete("507f1f77bcf86cd799439011")  # bool

Typed domain mode

from dataclasses import dataclass
from openframe.adapters.db.mongo import MongoSettings, MongoRepository

@dataclass
class Artifact:
    id: str
    title: str
    artifact_type: str

class ArtifactRepository(MongoRepository[Artifact]):
    _collection = "artifacts"

    def _doc_to_entity(self, doc: dict) -> Artifact:
        return Artifact(
            id=doc["_id"],
            title=doc["title"],
            artifact_type=doc["artifact_type"],
        )

    def _entity_to_doc(self, entity: Artifact) -> dict:
        return {
            "_id": entity.id,
            "title": entity.title,
            "artifact_type": entity.artifact_type,
        }

settings = MongoSettings()
repo = ArtifactRepository(settings)
artifact: Artifact | None = await repo.get("507f1f77bcf86cd799439011")

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_id handling

MongoDB uses _id as the document identifier; BaseRepository uses entity_id: str. The adapter bridges this transparently:

• Reading: _id is always returned as str — ObjectId is never exposed to callers. A convenience id key is also added mirroring _id.
• Writing: If an entity dict has an id key but no _id key, the adapter maps id → _id before insertion.
• Filtering: String entity IDs that are valid 24-char hex are parsed as ObjectId for indexed lookups; other strings are used as plain string _id values.

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Configuration

All settings are read from environment variables.

Env var	Type	Default	Description
MONGO_URL	str	required	Motor/pymongo connection string
MONGO_DATABASE	str	required	Database name
MONGO_MIN_POOL_SIZE	int	5	Minimum pool connections
MONGO_MAX_POOL_SIZE	int	20	Maximum pool connections
MONGO_SERVER_SELECTION_TIMEOUT_MS	int	5000	Server selection timeout (ms)
MONGO_TLS	bool	False	Enable TLS/SSL
MONGO_TLS_ALLOW_INVALID_CERTS	bool	False	Skip cert validation (dev only)
CONNECTION_TIMEOUT	float	30.0	Pool creation timeout (s)
OPERATION_TIMEOUT	float	10.0	Per-operation timeout (s)
MAX_RETRIES	int	3	Max retry attempts

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Timeout strategy

Two layers of timeout on every operation:

1. asyncio.timeout(settings.operation_timeout) — cancels the Python coroutine.
2. max_time_ms=int(settings.operation_timeout * 1000) passed to motor query methods — instructs the MongoDB server to abort the query.

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Health checks

MongoRepository implements the HealthCheck protocol from openframe-core.

alive = await repo.ping()       # admin.command("ping") — fast liveness check
ready = await repo.is_ready()   # list_collection_names() — full readiness check

Both methods return False on any failure and never raise.

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Exception hierarchy

All exceptions are AdapterError subclasses from openframe.core.exceptions. Raw motor/pymongo exceptions never escape the adapter.

Situation	Exception
Cannot connect to MongoDB	AdapterConnectionError
Invalid MONGO_URL syntax	AdapterConfigurationError
Query failed (constraint, auth, etc.)	AdapterQueryError
Operation exceeded timeout	AdapterTimeoutError

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Development

# from the package directory
pip install -e ".[dev]"
pytest tests/ -v

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Protocol conformance

from openframe.core.ports import BaseRepository
from openframe.core.health import HealthCheck

repo = MongoRepository(settings, collection="artifacts")
assert isinstance(repo, BaseRepository)   # True — structural check
assert isinstance(repo, HealthCheck)      # True — structural check

No inheritance from either Protocol is required or used.

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License

MIT