| import { devAssert } from './jsutils/devAssert.mjs'; |
| import { isPromise } from './jsutils/isPromise.mjs'; |
| import { parse } from './language/parser.mjs'; |
| import { validateSchema } from './type/validate.mjs'; |
| import { validate } from './validation/validate.mjs'; |
| import { execute } from './execution/execute.mjs'; |
| /** |
| * This is the primary entry point function for fulfilling GraphQL operations |
| * by parsing, validating, and executing a GraphQL document along side a |
| * GraphQL schema. |
| * |
| * More sophisticated GraphQL servers, such as those which persist queries, |
| * may wish to separate the validation and execution phases to a static time |
| * tooling step, and a server runtime step. |
| * |
| * Accepts either an object with named arguments, or individual arguments: |
| * |
| * schema: |
| * The GraphQL type system to use when validating and executing a query. |
| * source: |
| * A GraphQL language formatted string representing the requested operation. |
| * rootValue: |
| * The value provided as the first argument to resolver functions on the top |
| * level type (e.g. the query object type). |
| * contextValue: |
| * The context value is provided as an argument to resolver functions after |
| * field arguments. It is used to pass shared information useful at any point |
| * during executing this query, for example the currently logged in user and |
| * connections to databases or other services. |
| * variableValues: |
| * A mapping of variable name to runtime value to use for all variables |
| * defined in the requestString. |
| * operationName: |
| * The name of the operation to use if requestString contains multiple |
| * possible operations. Can be omitted if requestString contains only |
| * one operation. |
| * fieldResolver: |
| * A resolver function to use when one is not provided by the schema. |
| * If not provided, the default field resolver is used (which looks for a |
| * value or method on the source value with the field's name). |
| * typeResolver: |
| * A type resolver function to use when none is provided by the schema. |
| * If not provided, the default type resolver is used (which looks for a |
| * `__typename` field or alternatively calls the `isTypeOf` method). |
| */ |
| |
| export function graphql(args) { |
| // Always return a Promise for a consistent API. |
| return new Promise((resolve) => resolve(graphqlImpl(args))); |
| } |
| /** |
| * The graphqlSync function also fulfills GraphQL operations by parsing, |
| * validating, and executing a GraphQL document along side a GraphQL schema. |
| * However, it guarantees to complete synchronously (or throw an error) assuming |
| * that all field resolvers are also synchronous. |
| */ |
| |
| export function graphqlSync(args) { |
| const result = graphqlImpl(args); // Assert that the execution was synchronous. |
| |
| if (isPromise(result)) { |
| throw new Error('GraphQL execution failed to complete synchronously.'); |
| } |
| |
| return result; |
| } |
| |
| function graphqlImpl(args) { |
| // Temporary for v15 to v16 migration. Remove in v17 |
| arguments.length < 2 || |
| devAssert( |
| false, |
| 'graphql@16 dropped long-deprecated support for positional arguments, please pass an object instead.', |
| ); |
| const { |
| schema, |
| source, |
| rootValue, |
| contextValue, |
| variableValues, |
| operationName, |
| fieldResolver, |
| typeResolver, |
| } = args; // Validate Schema |
| |
| const schemaValidationErrors = validateSchema(schema); |
| |
| if (schemaValidationErrors.length > 0) { |
| return { |
| errors: schemaValidationErrors, |
| }; |
| } // Parse |
| |
| let document; |
| |
| try { |
| document = parse(source); |
| } catch (syntaxError) { |
| return { |
| errors: [syntaxError], |
| }; |
| } // Validate |
| |
| const validationErrors = validate(schema, document); |
| |
| if (validationErrors.length > 0) { |
| return { |
| errors: validationErrors, |
| }; |
| } // Execute |
| |
| return execute({ |
| schema, |
| document, |
| rootValue, |
| contextValue, |
| variableValues, |
| operationName, |
| fieldResolver, |
| typeResolver, |
| }); |
| } |