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// @flow
const debug = require('debug')('api:graphql');
import { ApolloServer } from 'apollo-server-express';
import responseCachePlugin from 'apollo-server-plugin-response-cache';
import depthLimit from 'graphql-depth-limit';
import costAnalysis from 'graphql-cost-analysis';
import { RedisCache } from 'apollo-server-cache-redis';
import createLoaders from './loaders';
import createErrorFormatter from './utils/create-graphql-error-formatter';
import schema from './schema';
import { statsd } from 'shared/statsd';
import { getUserIdFromReq } from './utils/session-store';
import UserError from './utils/UserError';
import type { DBUser } from 'shared/types';
import { getUserById } from '../shared/db/queries/user';
// NOTE(@mxstbr): Evil hack to make graphql-cost-analysis work with Apollo Server v2
// @see pa-bru/graphql-cost-analysis#12
// @author @arianon
class ProtectedApolloServer extends ApolloServer {
async createGraphQLServerOptions(
req: express$Request,
res: express$Response
): Promise<*> {
const options = await super.createGraphQLServerOptions(req, res);
return {
...options,
validationRules: [
...options.validationRules,
costAnalysis({
maximumCost: 750,
defaultCost: 1,
variables: req.body.variables,
createError: (max, actual) => {
const err = new UserError(
`GraphQL query exceeds maximum complexity, please remove some nesting or fields and try again. (max: ${max}, actual: ${actual})`
);
return err;
},
}),
],
};
}
}
let connections = 0;
setInterval(() => {
statsd.gauge('websocket.connections.count', connections);
}, 5000);
const server = new ProtectedApolloServer({
schema,
formatError: createErrorFormatter(),
// For subscriptions, this gets passed "connection", for everything else "req" and "res"
context: ({ req, res, connection, ...rest }, ...other) => {
if (connection) {
return {
...(connection.context || {}),
};
}
// Add GraphQL operation information to the statsd tags
req.statsdTags = {
graphqlOperationName: req.body.operationName || 'unknown_operation',
};
debug(req.body.operationName || 'unknown_operation');
const loaders = createLoaders();
let currentUser = req.user && !req.user.bannedAt ? req.user : null;
return {
loaders,
updateCookieUserData: (data: DBUser) =>
new Promise((res, rej) =>
req.login(data, err => (err ? rej(err) : res()))
),
req,
user: currentUser,
};
},
subscriptions: {
path: '/websocket',
onConnect: (connectionParams, rawSocket) => {
connections++;
return getUserIdFromReq(rawSocket.upgradeReq)
.then(id => (id ? getUserById(id) : null))
.then(user => {
return {
user: user || null,
loaders: createLoaders({ cache: false }),
};
})
.catch(err => {
console.error(err);
return {
loaders: createLoaders({ cache: false }),
};
});
},
},
playground: process.env.NODE_ENV !== 'production' && {
settings: {
'editor.theme': 'light',
},
tabs: [
{
endpoint: 'http://localhost:3001/api',
query: `{
user(username: "mxstbr") {
id
username
}
}`,
},
],
},
introspection: process.env.NODE_ENV !== 'production',
maxFileSize: 25 * 1024 * 1024, // 25MB
engine: false,
tracing: false,
validationRules: [depthLimit(10)],
cacheControl: {
calculateHttpHeaders: false,
// Cache everything for at least a minute since we only cache public responses
defaultMaxAge: 60,
},
plugins: [
responseCachePlugin({
sessionId: ({ context }) => (context.user ? context.user.id : null),
// Only cache public responses
shouldReadFromCache: ({ context }) => !context.user,
shouldWriteToCache: ({ context }) => !context.user,
}),
],
});
export default server;
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