Dependency Injection & Yield Teardown

Trace how FastAPI computes topological sort dependency trees, memoizes sub-dependency calls with use_cache=True, and guarantees context teardowns.

Dependency Resolution Graph

GENERATORget_db_session()

PENDING

Injected: AsyncSession (Pool Conn)Teardown: await session.close()

FUNCTIONoauth2_scheme()

PENDING

Injected: Bearer eyJhbGciOi...

FUNCTIONget_current_user()

PENDING

Injected: User(id=42, role="admin")

FUNCTIONrequire_admin_role()

PENDING

Injected: Authorized: True

FUNCTIONPOST /api/v1/admin/users

PENDING

Injected: HTTP 200 OK Response

Dependency Cache (use_cache=True)O(1) REUSE

Cache empty — ready for request.

[INIT] Dependency Injection DAG Engine ready.

[READY] Click "Resolve Dependency Tree" to step through hierarchical resolution.

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