88 lines
2.5 KiB
JavaScript
88 lines
2.5 KiB
JavaScript
'use strict'
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const { createWriteStream, unlink } = require('fs')
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const { ApolloServer } = require('apollo-server-koa')
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const Koa = require('koa')
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const lowdb = require('lowdb')
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const FileSync = require('lowdb/adapters/FileSync')
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const mkdirp = require('mkdirp')
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const shortid = require('shortid')
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const { schema } = require('./schema')
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const UPLOAD_DIR = './uploads'
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const db = lowdb(new FileSync('db.json'))
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// Seed an empty DB.
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db.defaults({ uploads: [] }).write()
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// Ensure upload directory exists.
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mkdirp.sync(UPLOAD_DIR)
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/**
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* Stores a GraphQL file upload. The file is stored in the filesystem and its
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* metadata is recorded in the DB.
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* @param {GraphQLUpload} upload GraphQL file upload.
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* @returns {object} File metadata.
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*/
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const storeUpload = async (upload) => {
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const { createReadStream, filename, mimetype } = await upload
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const stream = createReadStream()
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const id = shortid.generate()
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const path = `${UPLOAD_DIR}/${id}-${filename}`
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const file = { id, filename, mimetype, path }
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// Store the file in the filesystem.
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await new Promise((resolve, reject) => {
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// Create a stream to which the upload will be written.
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const writeStream = createWriteStream(path)
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// When the upload is fully written, resolve the promise.
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writeStream.on('finish', resolve)
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// If there's an error writing the file, remove the partially written file
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// and reject the promise.
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writeStream.on('error', (error) => {
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unlink(path, () => {
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reject(error)
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})
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})
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// In node <= 13, errors are not automatically propagated between piped
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// streams. If there is an error receiving the upload, destroy the write
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// stream with the corresponding error.
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stream.on('error', (error) => writeStream.destroy(error))
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// Pipe the upload into the write stream.
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stream.pipe(writeStream)
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})
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// Record the file metadata in the DB.
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db.get('uploads').push(file).write()
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return file
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}
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const app = new Koa()
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const server = new ApolloServer({
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uploads: {
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// Limits here should be stricter than config for surrounding
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// infrastructure such as Nginx so errors can be handled elegantly by
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// graphql-upload:
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// https://github.com/jaydenseric/graphql-upload#type-processrequestoptions
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maxFileSize: 10000000, // 10 MB
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maxFiles: 20,
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},
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schema,
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context: { db, storeUpload },
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})
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server.applyMiddleware({ app })
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app.listen(process.env.PORT, (error) => {
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if (error) throw error
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console.info(
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`Serving http://localhost:${process.env.PORT} for ${process.env.NODE_ENV}.`
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)
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})
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