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express-graphql with GraphQL Helix (#311)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,70 +1,78 @@ | ||
| /* SPDX-FileCopyrightText: 2016-present Kriasoft <hello@kriasoft.com> */ | ||
| /* SPDX-License-Identifier: MIT */ | ||
|
|
||
| import type { Request } from "express"; | ||
| import { graphqlHTTP } from "express-graphql"; | ||
| import fs from "fs"; | ||
| import type { NextFunction, Request, Response } from "express"; | ||
| import { GraphQLError, printSchema } from "graphql"; | ||
| import { | ||
| formatError, | ||
| GraphQLObjectType, | ||
| GraphQLSchema, | ||
| printSchema, | ||
| } from "graphql"; | ||
| getGraphQLParameters, | ||
| processRequest, | ||
| renderGraphiQL, | ||
| sendResult, | ||
| shouldRenderGraphiQL, | ||
| } from "graphql-helix"; | ||
| import { HttpError } from "http-errors"; | ||
| import { noop } from "lodash"; | ||
| import fs from "node:fs/promises"; | ||
| import { ValidationError } from "validator-fluent"; | ||
| import { Context } from "./context"; | ||
| import { reportError } from "./core"; | ||
| import env from "./env"; | ||
| import * as mutations from "./mutations"; | ||
| import * as queries from "./queries"; | ||
| import { nodeField, nodesField } from "./types/node"; | ||
| import { ValidationError } from "./utils"; | ||
| import schema from "./schema"; | ||
|
|
||
| /** | ||
| * GraphQL API schema. | ||
| */ | ||
| export const schema = new GraphQLSchema({ | ||
| query: new GraphQLObjectType({ | ||
| name: "Root", | ||
| description: "The top-level API", | ||
| // Customize GraphQL error serialization | ||
| GraphQLError.prototype.toJSON = ((serialize) => | ||
| function toJSON(this: GraphQLError) { | ||
| // The original serialized GraphQL error output | ||
| const output = serialize.call(this as GraphQLError); | ||
|
|
||
| fields: { | ||
| node: nodeField, | ||
| nodes: nodesField, | ||
| ...queries, | ||
| }, | ||
| }), | ||
| // Append the `HttpError` code | ||
| if (this.originalError instanceof HttpError) { | ||
| output.status = this.originalError.statusCode; | ||
| } | ||
|
|
||
| // Append the list of user input validation errors | ||
| if (this.originalError instanceof ValidationError) { | ||
| output.status = 400; | ||
| output.errors = this.originalError.errors; | ||
| } | ||
|
|
||
| mutation: new GraphQLObjectType({ | ||
| name: "Mutation", | ||
| fields: mutations, | ||
| }), | ||
| }); | ||
| return output; | ||
| })(GraphQLError.prototype.toJSON); | ||
|
|
||
| /** | ||
| * GraphQL middleware for Express.js | ||
| */ | ||
| export const graphql = graphqlHTTP((req, res, params) => ({ | ||
| schema, | ||
| context: new Context(req as Request), | ||
| graphiql: env.APP_ENV !== "prod", | ||
| pretty: !env.isProduction, | ||
| customFormatErrorFn: (err) => { | ||
| if (err.originalError instanceof ValidationError) { | ||
| res.statusCode = 400; | ||
| return { ...formatError(err), errors: err.originalError.errors }; | ||
| } | ||
| async function handleGraphQL(req: Request, res: Response, next: NextFunction) { | ||
| try { | ||
| if (shouldRenderGraphiQL(req)) { | ||
| res.send(renderGraphiQL({ endpoint: "/api" })); | ||
| } else { | ||
| const params = getGraphQLParameters(req); | ||
| const result = await processRequest<Context>({ | ||
| operationName: params.operationName, | ||
| query: params.query, | ||
| variables: params.variables, | ||
| request: req, | ||
| schema, | ||
| contextFactory: () => new Context(req), | ||
| }); | ||
|
|
||
| if (err.originalError instanceof HttpError) { | ||
| res.statusCode = err.originalError.statusCode; | ||
| sendResult(result, res, (result) => ({ | ||
| data: result.data, | ||
| errors: result.errors?.map((err) => { | ||
| if (!(err.originalError instanceof ValidationError)) { | ||
| reportError(err, req, params); | ||
| } | ||
| return err; | ||
| }), | ||
| })); | ||
| } | ||
| } catch (err) { | ||
| next(err); | ||
| } | ||
| } | ||
|
|
||
| reportError(err.originalError || err, req as Request, params); | ||
| return formatError(err); | ||
| }, | ||
| })); | ||
|
|
||
| export function updateSchema(cb?: fs.NoParamCallback): void { | ||
| function updateSchema(): Promise<void> { | ||
| const output = printSchema(schema); | ||
| fs.writeFile("./schema.graphql", output, { encoding: "utf-8" }, cb || noop); | ||
| return fs.writeFile("./schema.graphql", output, { encoding: "utf-8" }); | ||
| } | ||
|
|
||
| export { handleGraphQL, updateSchema }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| /* SPDX-FileCopyrightText: 2016-present Kriasoft <hello@kriasoft.com> */ | ||
| /* SPDX-License-Identifier: MIT */ | ||
|
|
||
| import { GraphQLObjectType, GraphQLSchema } from "graphql"; | ||
| import * as mutations from "./mutations"; | ||
| import * as queries from "./queries"; | ||
| import { nodeField, nodesField } from "./types/node"; | ||
|
|
||
| /** | ||
| * GraphQL API schema. | ||
| */ | ||
| export default new GraphQLSchema({ | ||
| query: new GraphQLObjectType({ | ||
| name: "Root", | ||
| description: "The top-level GraphQL API.", | ||
|
|
||
| fields: { | ||
| node: nodeField, | ||
| nodes: nodesField, | ||
| ...queries, | ||
| }, | ||
| }), | ||
|
|
||
| mutation: new GraphQLObjectType({ | ||
| name: "Mutation", | ||
| fields: mutations, | ||
| }), | ||
| }); |
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