set up Apollo server!

server/.gitignore

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+.env
+
+# From https://github.com/github/gitignore/blob/2a4de265d37eca626309d8e115218d18985b5435/Node.gitignore
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.pnp.*

server/db.js

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+require("dotenv").config();
+const mysql = require("mysql2/promise");
+
+async function connectToDb() {
+  const db = await mysql.createConnection({
+    host: "impress.openneo.net",
+    user: process.env["IMPRESS_MYSQL_USER"],
+    password: process.env["IMPRESS_MYSQL_PASSWORD"],
+    database: "openneo_impress",
+  });
+
+  return db;
+}
+
+module.exports = connectToDb;

server/index.js

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+const { ApolloServer, gql } = require("apollo-server");
+
+const connectToDb = require("./db");
+const { loadItems, loadItemTranslation } = require("./loaders");
+
+const typeDefs = gql`
+  type Item {
+    id: ID!
+    name: String!
+  }
+
+  type Query {
+    items(ids: [ID!]!): [Item!]!
+  }
+`;
+
+const resolvers = {
+  Item: {
+    name: async (item, _, { db }) => {
+      const translation = await loadItemTranslation(db, item.id, "en");
+      return translation.name;
+    },
+  },
+  Query: {
+    items: (_, { ids }, { db }) => loadItems(db, ids),
+  },
+};
+
+const server = new ApolloServer({
+  typeDefs,
+  resolvers,
+  context: async () => {
+    const db = await connectToDb();
+    return { db };
+  },
+});
+
+if (require.main === module) {
+  server.listen().then(({ url }) => {
+    console.log(`🚀  Server ready at ${url}`);
+  });
+}
+
+module.exports = { server };

server/index.test.js

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+const gql = require("graphql-tag");
+const { createTestClient } = require("apollo-server-testing");
+
+const connectToDb = require("./db");
+const actualConnectToDb = jest.requireActual("./db");
+const { server } = require("./index");
+
+const { query } = createTestClient(server);
+
+// Spy on db.execute, so we can snapshot the queries we run. This can help us
+// keep an eye on perf - watch for tests with way too many queries!
+jest.mock("./db");
+let queryFn;
+beforeEach(() => {
+  numQueries = 0;
+  connectToDb.mockImplementation(async (...args) => {
+    const db = await actualConnectToDb(...args);
+    queryFn = jest.spyOn(db, "execute");
+    return db;
+  });
+});
+afterEach(() => {
+  jest.resetAllMocks();
+});
+
+it("can load items", async () => {
+  const res = await query({
+    query: gql`
+      query($ids: [ID!]!) {
+        items(ids: $ids) {
+          id
+          name
+        }
+      }
+    `,
+    variables: {
+      ids: [
+        38913, // Zafara Agent Gloves
+        38911, // Zafara Agent Hood
+        38912, // Zafara Agent Robe
+      ],
+    },
+  });
+
+  expect(res.errors).toBeFalsy();
+  expect(res.data).toMatchInlineSnapshot(`
+    Object {
+      "items": Array [
+        Object {
+          "id": "38911",
+          "name": "Zafara Agent Hood",
+        },
+        Object {
+          "id": "38912",
+          "name": "Zafara Agent Robe",
+        },
+        Object {
+          "id": "38913",
+          "name": "Zafara Agent Gloves",
+        },
+      ],
+    }
+  `);
+  expect(queryFn.mock.calls).toMatchInlineSnapshot(`
+    Array [
+      Array [
+        "SELECT * FROM items WHERE id IN (?,?,?)",
+        Array [
+          "38913",
+          "38911",
+          "38912",
+        ],
+      ],
+      Array [
+        "SELECT * FROM item_translations WHERE item_id = ? AND locale = ? LIMIT 1",
+        Array [
+          38911,
+          "en",
+        ],
+      ],
+      Array [
+        "SELECT * FROM item_translations WHERE item_id = ? AND locale = ? LIMIT 1",
+        Array [
+          38912,
+          "en",
+        ],
+      ],
+      Array [
+        "SELECT * FROM item_translations WHERE item_id = ? AND locale = ? LIMIT 1",
+        Array [
+          38913,
+          "en",
+        ],
+      ],
+    ]
+  `);
+});

server/loaders.js

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+async function loadItems(db, ids) {
+  const qs = ids.map((_) => "?").join(",");
+  const [rows, _] = await db.execute(
+    `SELECT * FROM items WHERE id IN (${qs})`,
+    ids
+  );
+
+  return rows;
+}
+
+async function loadItemTranslation(db, itemId, locale) {
+  const [
+    rows,
+    _,
+  ] = await db.execute(
+    `SELECT * FROM item_translations WHERE item_id = ? AND locale = ? LIMIT 1`,
+    [itemId, locale]
+  );
+  if (rows.length === 0) {
+    throw new Error(`could not load translation for ${itemId}, ${locale}`);
+  }
+
+  return rows[0];
+}
+
+module.exports = { loadItems, loadItemTranslation };

server/package.json

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+{
+  "name": "impress-2020-server",
+  "version": "1.0.0",
+  "main": "index.js",
+  "author": "Matchu",
+  "license": "MIT",
+  "dependencies": {
+    "apollo-server": "^2.12.0",
+    "dotenv": "^8.2.0",
+    "graphql": "^15.0.0",
+    "mysql2": "^2.1.0"
+  },
+  "devDependencies": {
+    "apollo-server-testing": "^2.12.0",
+    "jest": "^25.4.0",
+    "nodemon": "^2.0.3",
+    "prettier": "^2.0.5"
+  },
+  "scripts": {
+    "start": "node index.js",
+    "watch": "nodemon index.js",
+    "test": "jest",
+    "setup-mysql-user": "mysql -h impress.openneo.net -u matchu -p < setup-mysql-user.sql"
+  }
+}

server/setup-mysql-user.sql

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+GRANT SELECT ON openneo_impress.items TO impress2020;
+GRANT SELECT ON openneo_impress.item_translations TO impress2020;