@nyteshade/lattice-legacy

<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width,initial-scale=1"> <title>SchemaUtils.js - Documentation</title> <script src="scripts/prettify/prettify.js"></script> <script src="scripts/prettify/lang-css.js"></script>  <link type="text/css" rel="stylesheet" href="https://code.ionicframework.com/ionicons/2.0.1/css/ionicons.min.css"> <link type="text/css" rel="stylesheet" href="styles/prettify-tomorrow.css"> <link type="text/css" rel="stylesheet" href="styles/jsdoc-default.css"> </head> <body> <input type="checkbox" id="nav-trigger" class="nav-trigger" /> <label for="nav-trigger" class="navicon-button x"> <div class="navicon"></div> </label> <label for="nav-trigger" class="overlay"></label> <nav> <li class="nav-link nav-home-link"><a href="index.html">Home</a></li><li class="nav-heading">Classes</li><li class="nav-heading">C<a href="AwaitingPromiseError.html">AwaitingPromiseError</a></li><li class="nav-item">F<a 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class="page-title">SchemaUtils.js</h1> <section> <article> <pre class="prettyprint source linenums"><code>// @flow import path from 'path' import { SyntaxTree } from './SyntaxTree' import { GQLBase, META_KEY } from './GQLBase' import { GQLEnum } from './GQLEnum' import { GQLInterface } from './GQLInterface' import { GQLScalar } from './GQLScalar' import { typeOf } from 'ne-types' import { LatticeLogs as ll } from './utils' import { merge } from 'lodash' import EventEmitter from 'events' import { parse, print, buildSchema, GraphQLInterfaceType, GraphQLEnumType, GraphQLScalarType, GraphQLSchema } from 'graphql' /** * The SchemaUtils is used by tools such as GQLExpressMiddleware in order to * apply GraphQL Lattice specifics to the build schema. * * @class SchemaUtils */ export class SchemaUtils extends EventEmitter { /** * Calls all the Lattice post-schema creation routines on a given Schema * using data from a supplied array of classes. * * @param {GraphQLSchema} schema the schema to post-process * @param {Array<GQLBase>} Classes the Classes from which to drive post * processing data from */ static injectAll(schema: GraphQLSchema, Classes: Array<GQLBase>) { SchemaUtils.injectInterfaceResolvers(schema, Classes); SchemaUtils.injectEnums(schema, Classes); SchemaUtils.injectScalars(schema, Classes); SchemaUtils.injectComments(schema, Classes); } /** * Until such time as I can get the reference Facebook GraphQL AST parser to * read and apply descriptions or until such time as I employ the Apollo * AST parser, providing a `static get apiDocs()` getter is the way to get * your descriptions into the proper fields, post schema creation. * * This method walks the types in the registered classes and the supplied * schema type. It then injects the written comments such that they can * be exposed in graphiql and to applications or code that read the meta * fields of a built schema * * @memberof SchemaUtils * @method ⌾⠀injectComments * @static * @since 2.7.0 * * @param {Object} schema a built GraphQLSchema object created via buildSchema * or some other alternative but compatible manner * @param {Function[]} Classes these are GQLBase extended classes used to * manipulate the schema with. */ static injectComments(schema: Object, Classes: Array<GQLBase>) { const { DOC_CLASS, DOC_FIELDS, DOC_QUERIES, DOC_MUTATORS, DOC_SUBSCRIPTIONS, DOC_QUERY, DOC_MUTATION, DOC_SUBSCRIPTION } = GQLBase; for (let Class of Classes) { const docs = Class.apiDocs(); const query = schema._typeMap.Query; const mutation = schema._typeMap.Mutation; const subscription = schema._typeMap.Subscription; let type; if ((type = schema._typeMap[Class.name])) { let fields = type._fields; let values = type._values; if (docs[DOC_CLASS]) { type.description = docs[DOC_CLASS] } for (let field of Object.keys(docs[DOC_FIELDS] || {})) { if (fields && field in fields) { fields[field].description = docs[DOC_FIELDS][field]; } if (values) { for (let value of values) { if (value.name === field) { value.description = docs[DOC_FIELDS][field] } } } } } for (let [_type, _CONST, _topCONST] of [ [query, DOC_QUERIES, DOC_QUERY], [mutation, DOC_MUTATORS, DOC_MUTATION], [subscription, DOC_SUBSCRIPTIONS, DOC_SUBSCRIPTION] ]) { if ( _type && ( (Object.keys(docs[_CONST] || {}).length) || (docs[_topCONST] && docs[_topCONST].length) ) ) { let fields = _type._fields; if (docs[_topCONST]) { _type.description = docs[_topCONST] } for (let field of Object.keys(docs[_CONST])) { if (field in fields) { fields[field].description = docs[_CONST][field]; } } } } } } /** * Somewhat like `injectComments` and other similar methods, the * `injectInterfaceResolvers` method walks the registered classes and * finds `GQLInterface` types and applies their `resolveType()` * implementations. * * @memberof SchemaUtils * @method ⌾⠀injectInterfaceResolvers * @static * * @param {Object} schema a built GraphQLSchema object created via buildSchema * or some other alternative but compatible manner * @param {Function[]} Classes these are GQLBase extended classes used to * manipulate the schema with. */ static injectInterfaceResolvers(schema: Object, Classes: Array<GQLBase>) { for (let Class of Classes) { if (Class.GQL_TYPE === GraphQLInterfaceType) { schema._typeMap[Class.name].resolveType = schema._typeMap[Class.name]._typeConfig.resolveType = Class.resolveType; } } } /** * Somewhat like `injectComments` and other similar methods, the * `injectInterfaceResolvers` method walks the registered classes and * finds `GQLInterface` types and applies their `resolveType()` * implementations. * * @memberof SchemaUtils * @method ⌾⠀injectEnums * @static * * @param {Object} schema a built GraphQLSchema object created via buildSchema * or some other alternative but compatible manner * @param {Function[]} Classes these are GQLBase extended classes used to * manipulate the schema with. */ static injectEnums(schema: Object, Classes: Array<GQLBase>) { for (let Class of Classes) { if (Class.GQL_TYPE === GraphQLEnumType) { const __enum = schema._typeMap[Class.name]; const values = Class.values; for (let value of __enum._values) { if (value.name in values) { merge(value, values[value.name]) } } } } } /** * GQLScalar types must define three methods to have a valid implementation. * They are serialize, parseValue and parseLiteral. See their docs for more * info on how to do so. * * This code finds each scalar and adds their implementation details to the * generated schema type config. * * @memberof SchemaUtils * @method ⌾⠀injectScalars * @static * * @param {Object} schema a built GraphQLSchema object created via buildSchema * or some other alternative but compatible manner * @param {Function[]} Classes these are GQLBase extended classes used to * manipulate the schema with. */ static injectScalars(schema: Object, Classes: Array<GQLBase>) { for (let Class of Classes) { if (Class.GQL_TYPE === GraphQLScalarType) { // @ComputedType const type = schema._typeMap[Class.name]; // @ComputedType const { serialize, parseValue, parseLiteral } = Class; if (!serialize || !parseValue || !parseLiteral) { // @ComputedType ll.error(`Scalar type ${Class.name} has invaild impl.`); continue; } merge(type._scalarConfig, { serialize, parseValue, parseLiteral }); } } } /** * A function that combines the IDL schemas of all the supplied classes and * returns that value to the middleware getter. * * @static * @memberof GQLExpressMiddleware * @method ⌾⠀generateSchemaSDL * * @return {string} a dynamically generated GraphQL IDL schema string */ static generateSchemaSDL( Classes: Array<GQLBase>, logOutput: boolean = true ): string { let schema = SyntaxTree.EmptyDocument(); let log = (...args) => { if (logOutput) { console.log(...args); } } for (let Class of Classes) { let classSchema = Class.SCHEMA; if (typeOf(classSchema) === 'Symbol') { let handler = Class.handler; let filename = path.basename(Class.handler.path) classSchema = handler.getSchema(); log( `\nRead schema (%s)\n%s\n%s\n`, filename, '-'.repeat(14 + filename.length), classSchema.replace(/^/gm, ' ') ) } schema.appendDefinitions(classSchema); } log('\nGenerated GraphQL Schema\n----------------\n%s', schema); return schema.toString(); } /** * An asynchronous function used to parse the supplied classes for each * ones resolvers and mutators. These are all combined into a single root * object passed to express-graphql. * * @static * @memberof SchemaUtils * @method ⌾⠀createMergedRoot * * @param {Array<GQLBase>} Classes the GQLBase extended class objects or * functions from which to merge the RESOLVERS and MUTATORS functions. * @param {Object} requestData for Express apss, this will be an object * containing { req, res, gql } where those are the Express request and * response object as well as the GraphQL parameters for the request. * @return {Promise<Object>} a Promise resolving to an Object containing all * the functions described in both Query and Mutation types. */ static async createMergedRoot( Classes: Array<GQLBase>, requestData: Object, separateByType: boolean = false ): Promise<Object> { const root = {}; for (let Class of Classes) { merge( root, // $FlowFixMe await Class.getMergedRoot(requestData, separateByType) ); } return root; } } export default SchemaUtils </code></pre> </article> </section> </div> <footer> Generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.5.5</a> on Sat Feb 17 2018 00:27:31 GMT-0800 (PST) using the Minami theme. </footer> <script>prettyPrint();</script> <script src="scripts/linenumber.js"></script> </body> </html>