mock.js

const { GraphQLScalarType } = require('graphql')
const { Kind } = require('graphql/language')
const fs = require('fs')
const casual = require('casual')
const express = require('express')
const bodyParser = require('body-parser')
const { graphqlExpress } = require('apollo-server-express')
const {
  makeExecutableSchema,
  addMockFunctionsToSchema
} = require('graphql-tools')

const Azogi = require('azogi')

const randomItem = function(array) {
  return array[Math.floor(Math.random() * array.length)]
}

const azogi = new Azogi()

azogi.onExhausted = function(i) {
  this.push(
    [
      randomItem(
        'JavaScript EMCAScript CoffeeScript IcedScript TypeScript Flow ActionScript PHP'.split(
          ' '
        )
      ),
      randomItem('是 不是 可能是 大概是 应该是 一定是 可能不是 大概不是 应该不是 一定不是'.split(' ')),
      randomItem('东半球 西半球 南半球 北半球 地球上 世界上 我会的 我知道的 我听说过的'.split(' ')),
      randomItem('最好的 最差的 最先进的 最落后的 最垃圾的 最优雅的'.split(' ')),
      randomItem('脚本语言 语言'.split(' '))
    ].join('')
  )
}

const resolverFunctions = {
  // TODO: move it to a separated npm package
  Date: new GraphQLScalarType({
    name: 'Date',
    description: 'Date scalar type',
    /**
     * @param {String} value
     * @return {Date}
     */
    parseValue(value) {
      return new Date(value)
    },
    /**
     * @param {Date} value
     */
    serialize(value) {
      return value.toISOString()
    },
    parseLiteral(ast) {
      if (ast.kind === Kind.String) {
        return ast.value
      }
      return null
    }
  })
}

const schemaString = fs.readFileSync('./schema.graphql').toString()
const schema = makeExecutableSchema({
  typeDefs: schemaString,
  resolvers: resolverFunctions
})
const mocks = {
  ID: () => Math.floor(Math.random() * 1e6) + '',
  Date: () => new Date(Date.now() - Math.random() * 1e8),
  String: () => azogi.nextParagraph(300, 100),
  Board: () => ({
    slug: casual.word,
    name: casual.word
  }),
  Topic: () => ({
    title: casual.title
  })
}
addMockFunctionsToSchema({
  schema,
  mocks
})
const app = express()

app.use(
  '/graphql',
  bodyParser.json(),
  graphqlExpress({
    schema
  })
)

const port = process.env.PORT || 8000
app.listen(port, () => {
  console.log(`Mock server listened on http://localhost:${port}/graphql`)
})