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Ariadne GraphQL Library

website·Indexed 34 days ago

https://ariadnegraphql.org/

A Python library for creating GraphQL APIs. It provides tools for defining schemas, implementing resolvers, and integrating with ASGI servers, Flask, Starlette, and AWS Lambda. The documentation covers core concepts like interfaces, unions, and schema directives, as well as advanced features such as subscription handlers, file uploads, and OpenTracing support across versions 0.8.0, 0.9.0, 1.0.0, 1.1.0, and Next.

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What's inside Ariadne

  1. Overview of ariadne-codegen

    ariadne-codegen is a Python code generator that consumes a GraphQL schema along with queries, mutations, and subscriptions to generate a Python package. This package provides a fully typed and asynchronous GraphQL client, including Pydantic models for schema types, inputs, enums, and GraphQL operation results.

  2. Overview of ariadne-codegen features

    ariadne-codegen is a Python code generator that processes GraphQL schemas, queries, mutations, and subscriptions to generate a Python package containing a fully typed and asynchronous GraphQL client. Key capabilities include:

    • Generating Pydantic models from schema types, inputs, and enums.
    • Generating Pydantic models specifically for GraphQL results.
    • Creating a client package where every GraphQL operation is exposed as an asynchronous method.

  3. Overview of Ariadne HTTP Subscription Handlers

    Ariadne provides a pluggable subscription handler system for GraphQLHTTPHandler to support custom HTTP-based transport protocols (e.g., Server-Sent Events, HTTP callbacks). This system uses the Strategy Pattern to decouple subscription execution from delivery. Note that WebSocket-based subscriptions are handled separately by GraphQLWSHandler and GraphQLTransportWSHandler and are not part of this pluggable system.

  4. Overview of Ariadne's Pluggable Subscription Handlers

    Ariadne provides a pluggable subscription handler system for GraphQLHTTPHandler to support custom HTTP-based transport protocols for GraphQL subscriptions, such as Server-Sent Events (SSE) or HTTP callbacks. This system uses the Strategy Pattern to decouple subscription execution from transport delivery.

    Note: This system is specifically for HTTP-based transports. WebSocket-based subscriptions are handled separately by GraphQLWSHandler and GraphQLTransportWSHandler.

  5. Overview of Ariadne's pluggable subscription handler system

    Ariadne provides a pluggable subscription handler system for GraphQLHTTPHandler to support custom HTTP-based transport protocols for GraphQL subscriptions (e.g., Server-Sent Events (SSE), HTTP callbacks). This system uses the Strategy Pattern to decouple subscription execution from transport delivery.

    Note: WebSocket-based subscriptions are handled separately by GraphQLWSHandler and GraphQLTransportWSHandler and are not part of this pluggable HTTP system.

  6. Overview of Ariadne HTTP Subscription Handlers

    Ariadne provides a pluggable subscription handler system for GraphQLHTTPHandler to support custom HTTP-based transport protocols (e.g., Server-Sent Events (SSE), HTTP callbacks). This system uses the Strategy Pattern to decouple subscription execution from delivery.

    Note: This system is specifically for HTTP-based transports. WebSocket-based subscriptions are handled separately by GraphQLWSHandler and GraphQLTransportWSHandler.

  7. Overview of ariadne-codegen

    ariadne-codegen is a Python code generator that processes a GraphQL schema along with queries, mutations, and subscriptions to generate a Python package. This package provides a fully typed and asynchronous GraphQL client, including Pydantic models for schema types, inputs, enums, and GraphQL operation results.

  9. Understand the N+1 problem in GraphQL

    The N+1 problem occurs when a GraphQL query retrieves a list of N items, and for each item, a separate data retrieval operation (like a database query or API call) is triggered to fetch a related object. This results in 1 initial query to get the list, plus N additional queries for the relations, leading to significant performance degradation.

  10. Understand the N+1 problem in GraphQL

    The N+1 problem occurs when a GraphQL query retrieves a list of N items, and for each item, the server performs an additional data retrieval operation to fetch a related object. This results in N+1 total queries (1 for the initial list and N for the related objects), which severely degrades performance. While using database JOINs can mitigate this, it can lead to 'overfetching' if the related field is not requested in the GraphQL query.

  11. Implement GraphQL subscriptions with Ariadne

    Subscriptions allow a server to notify clients when new data is available via an open channel. Because they require the WebSockets protocol, they can only be implemented in asynchronous servers (ASGI). WSGI-based servers (like standard Django) cannot handle WebSockets; for Django, use a Django Channels container with Ariadne as an ASGI server. If using uvicorn, ensure the websockets package is installed via pip install websockets.