node-froid: NodeJS - Federated Relay Object Identification
Table of Contents
- About The Project
- Getting Started
- Library API
- Usage
- Roadmap
- Contributing
- License
- Contact
- Acknowledgements
About The Project
The problem
There isn't good support for the Relay's Object Identification spec in the Federated GraphQL ecosystem. This makes it difficult to support common patterns used to refetch objects from your graph to power things like cache TTLs and cache-miss hydration.
The solution
@wayfair/node-froid provides two key pieces of functionality:
- id processing: a solution that can be used to run inline as part of a custom Data Source or as a completely separate subgraph (recommended) dedicated to service your object identification implementation .
- schema generation: a schema generation script that reflects on all subgraphs in your federated graph and generates a valid relay object identification schema.
- Can run in Federation v1 or v2 mode
- Supports contracts!
Getting Started
To get a local copy up and running follow these simple steps.
Installation
This module is distributed via npm which is bundled with node and should be installed as one of your project's direct dependencies:
npm install @wayfair/node-froid
or
for installation via yarn
yarn add @wayfair/node-froid
This library has peerDependencies listings for graphql and graphql-relay.
Library API
handleFroidRequest
| Parameter Name | Required | Description | Type | Default |
|---|---|---|---|---|
request |
Yes | The request object passed to the froid subgraph | see specific properties | |
request.query |
Yes | The query string for the request | string |
|
request.variables |
Yes | The variables for the request | Record<string, unknown> |
|
options |
Configuration options available to handleFroidRequest |
see specific properties | {} |
|
options.encode |
A callback for encoding the object identify key values | (string) => string |
(keyString) => keyString |
|
options.decode |
A callback for decoding an object identifier's key values | (string) => string |
(keyString) => keyString |
|
options.cache |
Cache to use to avoid re-parsing query documents | FroidCache |
Returns Promise<object[]>: A promise representing the list of entity objects containing a relay-spec compliant id value.
generateFroidSchema
| Parameter Name | Required | Description | Type | Default |
|---|---|---|---|---|
subgraphSchemaMap |
Yes | A mapping of subgraph names --> subgraph SDLs used to generate the froid schema | Map<string, string> |
|
froidSubgraphName |
Yes | The name of the relay subgraph service | string |
|
options |
Optional configuration for schema generation | see specific properties | {} |
|
options.contractTags |
A list of supported contract tags | string[] |
[] |
|
options.federatedVersion |
The version of federation to generate schema for | FederationVersion |
FederationVersion.V2 |
|
options.typeExceptions |
Types to exclude from id field generation |
string[] |
[] |
Returns DocumentNode[]: The froid schema
Usage
id Processing
Custom GraphQL Gateway Datasource
import {GraphQLDataSourceProcessOptions} from '@apollo/gateway';
import {GraphQLResponse} from 'apollo-server-types';
import {handleFroidRequest} from '@wayfair/node-froid';
import {Context} from './path/to/your/ContextType';
class FroidDataSource {
process({
request,
}: Pick<
GraphQLDataSourceProcessOptions<Context>,
'request'
>): Promise<GraphQLResponse> {
return await handleFroidRequest(request);
}
}
Custom GraphQL Gateway Datasource w/Encryption
// Datasource Implementation
import {GraphQLDataSourceProcessOptions} from '@apollo/gateway';
import {GraphQLResponse} from 'apollo-server-types';
import {
DecodeCallback,
EncodeCallback,
handleFroidRequest,
} from '@wayfair/node-froid';
// You only really need this if you are using context
import {Context} from './path/to/your/ContextType';
// Used to determine which encoder to use
import {FeatureToggleManager} from './path/to/your/FeatureToggleManager';
// Interface we need to match properly encode key values
interface Encoder {
encode: EncodeCallback;
decode: DecodeCallback;
}
class FroidLDataSource {
private encoder1: Encoder;
private encoder2: Encoder;
// Take two encoders to support live key rotation
constructor(encoder1: Encoder, encoder2, Encoder) {
this.encoder1 = encoder1;
this.encoder2 = encoder2;
}
process({
request,
}: Pick<
GraphQLDataSourceProcessOptions<Context>,
'request'
>): Promise<GraphQLResponse> {
const encoder = FeatureToggleManager.useEncoder1()
? this.encoder1
: this.encoder2;
return await handleFroidRequest(request, {...encoder});
}
}
// Sample Encoder
import crypto from 'crypto';
import {DecodeCallback, EncodeCallback} from '@wayfair/node-froid';
const ENCRYPTION_ALGORITHM = 'aes-256-cbc';
// Interface we need to match properly encode key values
interface Encoder {
encode: EncodeCallback;
decode: DecodeCallback;
}
type CreateEncoderArguments = {
base64InitializationVector: string;
base64EncryptionKey: string;
};
export class CustomEncoder implements Encoder {
private iv: Buffer;
private key: Buffer;
constructor({
base64InitializationVector,
base64EncryptionKey,
}: CreateEncoderArguments) {
this.iv = Buffer.from(base64InitializationVector, 'base64');
this.key = Buffer.from(base64EncryptionKey, 'base64');
}
public encode(value: string): string {
const cipher = crypto.createCipheriv(
ENCRYPTION_ALGORITHM,
this.key,
this.iv
);
const encryptedValue = cipher.update(value);
const encryptedBuffer = Buffer.concat([encryptedValue, cipher.final()]);
return encryptedBuffer.toString('base64');
}
public decode(value: string): object {
const decipher = crypto.createDecipheriv(
ENCRYPTION_ALGORITHM,
this.key,
this.iv
);
const decryptedValue = decipher.update(Buffer.from(value, 'base64'));
const decryptedBuffer = Buffer.concat([decryptedValue, decipher.final()]);
return decryptedBuffer.toString();
}
}
Custom GraphQL Gateway Datasource w/Cache
import {GraphQLDataSourceProcessOptions} from '@apollo/gateway';
import {GraphQLResponse} from 'apollo-server-types';
import {handleRelayRequest} from '@wayfair/node-froid';
import {Context} from './path/to/your/ContextType';
import LRU from 'lru-cache';
const cache = new LRU({max: 500});
class RelayNodeGraphQLDataSource {
process({
request,
}: Pick<
GraphQLDataSourceProcessOptions<Context>,
'request'
>): Promise<GraphQLResponse> {
return await handleRelayRequest(request, {
cache,
});
}
}
Subgraph w/Express Server
import express from 'express';
import bodyParser from 'body-parser';
import {handleFroidRequest} from '@wayfair/node-froid';
const port = process.env.PORT || 5000;
const app = express();
app.use(bodyParser.urlencoded({extended: false}));
app.use(bodyParser.json());
// No need to run a full GraphQL server.
// Avoid the additional overhead and manage the route directly instead!
app.post('/graphql', async (req, res) => {
const result = await handleFroidRequest(req.body);
res.send(result);
});
app.listen(port, () => {
console.log(`Froid subgraph listening on port ${port}`);
});
Schema Generation
Basic Script
import fs from 'fs';
import {print} from 'graphql';
import {generateFroidSchema} from '@wayfair/node-froid';
// You have to provide this. Apollo's public API should provide the ability to extract out subgraph SDL
import {getFederatedSchemas} from './getFederatedSchemas';
const froidSubgraphName = 'froid-service';
const variant = 'current';
// Map<string, string> where the key is the subgraph name, and the value is the SDL schema
const subgraphSchemaMap = getFederatedSchemas(variant);
const schemaAst = generateFroidSchema(subgraphSchemaMap, froidSubgraphName);
// persist results to a file to use with rover publish
fs.writeFileSync('schema.graphql', print(schemaAst));
Roadmap
See the open issues for a list of proposed features (and known issues).
Contributing
Contributions are what make the open source community such an amazing place to learn, inspire, and create. Any contributions you make are greatly appreciated. For detailed contributing guidelines, please see CONTRIBUTING.md
License
Distributed under the MIT License. See LICENSE for more information.
Contact
- Mark Faga: Twitter
Project Link: https://github.com/wayfair-incubator/node-froid
Acknowledgements
This template was adapted from https://github.com/othneildrew/Best-README-Template.
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