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