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https://github.com/gmac/schema-stitching-handbook

Guided examples exploring GraphQL Tools v6+ Schema Stitching
https://github.com/gmac/schema-stitching-handbook

graphql graphql-tools remote-schemas schema-stitching

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Guided examples exploring GraphQL Tools v6+ Schema Stitching

Host: GitHub
URL: https://github.com/gmac/schema-stitching-handbook
Owner: gmac
License: mit
Created: 2020-11-25T03:46:05.000Z (almost 4 years ago)
Default Branch: main
Last Pushed: 2023-02-13T18:55:34.000Z (over 1 year ago)
Last Synced: 2024-05-10T23:36:48.022Z (4 months ago)
Topics: graphql, graphql-tools, remote-schemas, schema-stitching
Language: JavaScript
Homepage:
Size: 792 KB
Stars: 347
Watchers: 9
Forks: 38
Open Issues: 1
Metadata Files:
- Readme: README.md
- License: LICENSE

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README

        # ![Schema Stitching Handbook](./images/banner-1.jpg)

Guided examples of [GraphQL Stitching](https://the-guild.dev/graphql/stitching/docs) doing useful things. While this book focuses on [GraphQL Tools](https://github.com/ardatan/graphql-tools) (JavaScript) and its specific capabilities, many of these general schema stitching concepts apply to implementations across languages, see similar projects:

- [Bramble](https://github.com/movio/bramble) (Golang)

- [graphql-stitching-ruby](https://github.com/gmac/graphql-stitching-ruby) (Ruby)

## Table of Contents

### Installation

From the root directory, run:

```sh

yarn install

```

### Foundation

- **[Combining local and remote schemas](./combining-local-and-remote-schemas)**

  - Adding a locally-executable schema.

  - Adding a remote schema, fetched via introspection.

  - Adding a remote schema, fetched from a custom SDL service.

  - Avoiding schema conflicts using transforms.

  - Authorization headers.

  - Basic error handling.

- **[Mutations & subscriptions](./mutations-and-subscriptions)**

  - Adding a remote mutation service.

  - Adding a remote subscription service.

  - Adding a subscriber proxy.

- **[Single-record type merging](./type-merging-single-records)**

  - Type merging using single-record queries.

  - Query/execution batching.

- **[Array-batched type merging](./type-merging-arrays)**

  - Type merging using array queries.

  - Handling array errors.

  - Nullability & error remapping.

- **[Merged types with multiple keys](./type-merging-multiple-keys)**

  - Configuring multiple key entry points for a merged type.

- **[Nullable merges](./type-merging-nullables)**

  - Selecting nullability for merged fields.

  - Returning nullable and not-nullable results.

- **[Custom merge resolvers](./custom-merge-resolvers)**

  - Using `valuesFromResults` to normalize resulting query data.

  - Adapting type merging to query through namespaced scopes.

  - Adapting type merging to query through non-root fields.

  - Using `batchDelegateToSchema` and `delegateToSchema`.

- **[Cross-service interfaces](./type-merging-interfaces)**

  - Distributing a GraphQL interface across services.

- **[Computed fields](./computed-fields)**

  - Configuring computed fields.

  - Sending complex inputs to subservices.

  - Normalizing subservice deprecations in the gateway.

- **[Stitching directives SDL](./stitching-directives-sdl)**

  - `@key` directive for type-level selection sets.

  - `@merge` directive for type merging services.

  - `@computed` directive for computed fields.

  - `@canonical` directive for preferred element definitions.

### Architecture

- **[Hot schema reloading](./hot-schema-reloading)**

  - Hot reload of the combined gateway schema (no server restart).

  - Polling for remote subschema changes.

  - Mutations for adding/removing remote subservices.

  - Handling subservice request timeouts.

- **[Versioning schema releases](./versioning-schema-releases)**

  - Using GitHub API to manage a simple schema registry.

  - Hot reloading from a remote Git registry.

  - Running development and production environments.

- **[Continuous Integration (CI) testing](./continuous-integration-testing)**

  - Adding test coverage to a stitched schema.

  - Mocking subservices as local test fixtures.

- **[Public and private APIs](./public-and-private-apis)**

  - Filtering unwanted fields from the final stitched schema.

  - Serving public (filtered) and private (unfiltered) API versions.

### Other Integrations

- **[Federation services](./federation-services)**

  - Integrating Apollo Federation services into a stitched schema.

  - Fetching and parsing Federation SDLs.

- **[Subservice languages](./subservice-languages)**

  - **[JavaScript](./subservice-languages/javascript)** schemas created with:

    - `graphql-js`

    - `nexus`

    - `type-graphql`

  - **[Ruby](./subservice-languages/ruby)** schemas created with:

    - Class-based definitions

    - Parsed definitions string

- **[GraphQL Upload](./graphql-upload)**

  - Adding GraphQL Upload to the gateway server

### Appendices

- [What is Array Batching?](https://github.com/gmac/schema-stitching-demos/wiki/Batching-Arrays-and-Queries#what-is-array-batching)

- [What is Query Batching?](https://github.com/gmac/schema-stitching-demos/wiki/Batching-Arrays-and-Queries#what-is-query-batching)