| import { withRenderContextEnvironment, GraphQLSchema, Collections } from 'meteor/vulcan:lib'; | |
| import { makeExecutableSchema } from 'graphql-tools'; | |
| import { graphql, print } from 'graphql'; | |
| import DataLoader from 'dataloader'; | |
| import deepmerge from 'deepmerge'; | |
| async function findByIds(collection, ids, context) { | |
| // get documents | |
| const documents = await collection.find({ _id: { $in: ids } }).fetch(); | |
| // order documents in the same order as the ids passed as argument | |
| return ids.map(id => _.findWhere(documents, {_id: id})); | |
| } | |
| Meteor.startup(() => { | |
| const schema = makeExecutableSchema({ | |
| typeDefs: GraphQLSchema.finalSchema, | |
| resolvers: GraphQLSchema.resolvers, | |
| }); | |
| withRenderContextEnvironment(async function (renderContext, req, res, next) { | |
| const context = deepmerge({ | |
| // My own extension to Vulcan.js. | |
| // It's really useful when you have access to the ApolloClient inside resolvers. | |
| // This makes it possible for resolvers to make their own queries. | |
| getRenderContext() { return renderContext; } | |
| }, GraphQLSchema.context); | |
| // go over context and add Dataloader to each collection | |
| Collections.forEach(collection => { | |
| context[collection.options.collectionName].loader = new DataLoader(ids => findByIds(collection, ids, context), { | |
| cache: true | |
| }); | |
| }); | |
| renderContext.apolloClient.networkInterface = { | |
| query: (request) => { | |
| return graphql(schema, print(request.query), {}, context, request.variables, request.debugName); | |
| } | |
| }; | |
| next(); | |
| }, { order: 23, name: 'internal-graphql-middleware' }); | |
| }); |
| Package.describe({ | |
| name: 'internal-graphql', | |
| version: '0.0.1', | |
| // Brief, one-line summary of the package. | |
| summary: 'Prevent extraneous HTTP connections created by Vulcan to itself.', | |
| // URL to the Git repository containing the source code for this package. | |
| git: '', | |
| // By default, Meteor will default to using README.md for documentation. | |
| // To avoid submitting documentation, set this field to null. | |
| documentation: 'README.md' | |
| }); | |
| Package.onUse(function(api) { | |
| api.versionsFrom('1.5.1'); | |
| api.use([ | |
| 'ecmascript', | |
| 'vulcan:lib' | |
| ]); | |
| api.mainModule('internal-graphql.js', ['server']); | |
| }); |
To make a GraphQL query on a Vulcan.js server, your server has to connect to itself via a new HTTP connection every time it receives a request.
This package makes it so that Vulcan’s GraphQL queries never leave the process. All GraphQL requests are processed with no overhead.