sonnet-graph

Graph database integration (cypher-graphdb) for sonnet-server applications.

Provides reusable infrastructure for sonnet-server apps that need a cypher-graphdb connection pool:

GraphDBExtension -- sonnet-server extension managing pool lifecycle (startup/shutdown), with optional mode for apps where graph is not required.
Pool context -- borrow_graphdb() context manager and get_current_graphdb() ambient session accessor via ContextVar.
Readiness checks -- GraphdbStage with initialization and health checks for the sonnet-server readiness pipeline.
FastAPI dependencies -- get_graphdb_session() async generator for router-level ambient sessions.

Installation

pip install sonnet-graph

Usage

from sonnet_graph import GraphDBExtension, borrow_graphdb, get_current_graphdb

# In app.py -- register the extension
_extension_registry = create_extension_registry(
    DatabaseExtension(),
    GraphDBExtension(),          # required (raises on missing CGDB_* settings)
    GraphDBExtension(optional=True),  # or optional (skips if unconfigured)
    ...
)

# In service code -- borrow a connection
with borrow_graphdb() as db:
    db.execute("MATCH (n) RETURN count(n)")

# In service code -- ambient session (within borrow_graphdb scope)
db = get_current_graphdb()

Configuration

Graph connection is configured via cypher-graphdb's own environment variables (not duplicated in consumer settings):

Variable	Description
`CGDB_BACKEND`	Backend type: `age` or `memgraph`
`CGDB_CINFO`	Connection string / DSN
`CGDB_GRAPH`	Graph name
`CGDB_READ_ONLY`	Read-only mode (default: `false`)
`CGDB_CREATE_GRAPH_IF_NOT_EXISTS`	Auto-create graph, AGE only (default: `false`)

Intended Audience
- Developers
Programming Language

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