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import contextlib |
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import webbrowser |
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import strawberry |
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from starlette.applications import Starlette |
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from starlette.requests import Request |
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from starlette.responses import RedirectResponse |
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from starlette.schemas import SchemaGenerator |
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from starlette.types import ASGIApp |
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from strawberry.asgi import GraphQL |
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from strawberry.extensions.tracing import OpenTelemetryExtension |
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from graphinate.server.starlette import routes |
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DEFAULT_PORT: int = 8072 |
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GRAPHQL_ROUTE_PATH = "/graphql" |
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def _openapi_schema(request: Request) -> ASGIApp: |
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""" |
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Generates an OpenAPI schema for the GraphQL API and other routes. |
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Args: |
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request (Request): The HTTP request object. |
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Returns: |
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ASGIApp: An OpenAPI response containing the schema for the specified routes. |
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""" |
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schema_data = { |
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'openapi': '3.0.0', |
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'info': {'title': 'Graphinate API', 'version': '0.8.2'}, |
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'paths': { |
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'/graphql': {'get': {'responses': {200: {'description': 'GraphQL'}}}}, |
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'/graphiql': {'get': {'responses': {200: {'description': 'GraphiQL UI.'}}}}, |
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'/metrics': {'get': {'responses': {200: {'description': 'Prometheus metrics.'}}}}, |
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'/viewer': {'get': {'responses': {200: {'description': '3D Force-Directed Graph Viewer'}}}}, |
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'/voyager': {'get': {'responses': {200: {'description': 'Voyager GraphQL Schema Viewer'}}}} |
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} |
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} |
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schema = SchemaGenerator(schema_data) |
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return schema.OpenAPIResponse(request=request) |
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def _graphql_app(graphql_schema: strawberry.Schema) -> strawberry.asgi.GraphQL: |
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graphql_schema.extensions.append(OpenTelemetryExtension) |
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graphql_app = GraphQL(graphql_schema, graphiql=True) |
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return graphql_app |
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def _starlette_app(graphql_app: strawberry.asgi.GraphQL | None = None, port: int = DEFAULT_PORT, **kwargs) -> Starlette: |
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def open_url(endpoint): |
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webbrowser.open(f'http://localhost:{port}/{endpoint}') |
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@contextlib.asynccontextmanager |
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async def lifespan(app: Starlette): # pragma: no cover |
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if kwargs.get('browse'): |
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open_url('viewer') |
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yield |
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app = Starlette( |
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lifespan=lifespan, |
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routes=routes() |
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) |
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from starlette_prometheus import PrometheusMiddleware, metrics |
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app.add_middleware(PrometheusMiddleware) |
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app.add_route("/metrics", metrics) |
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if graphql_app: |
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app.add_route(GRAPHQL_ROUTE_PATH, graphql_app) |
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app.add_websocket_route(GRAPHQL_ROUTE_PATH, graphql_app) |
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app.add_route("/schema", route=_openapi_schema, include_in_schema=False) |
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app.add_route("/openapi.json", route=_openapi_schema, include_in_schema=False) |
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async def redirect_to_viewer(request): |
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return RedirectResponse(url='/viewer') |
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app.add_route('/', redirect_to_viewer) |
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return app |
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def server(graphql_schema: strawberry.Schema, port: int = DEFAULT_PORT, **kwargs): |
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""" |
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Args: |
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graphql_schema: The Strawberry GraphQL schema. |
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port: The port number to run the server on. Defaults to 8072. |
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Returns: |
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""" |
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graphql_app = _graphql_app(graphql_schema) |
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app = _starlette_app(graphql_app, port=port, **kwargs) |
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import uvicorn |
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uvicorn.run(app, host='0.0.0.0', port=port) |
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__all__ = ['server'] |
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erivlis /
graphinate
