graphgl

import {
  graphql,
  GraphQLSchema,
  GraphQLObjectType,
  GraphQLString,
} from 'graphql';

var schema = new GraphQLSchema({
  query: new GraphQLObjectType({
    name: 'RootQueryType',
    fields: {
      hello: {
        type: GraphQLString,
        resolve() {
          return 'world';
        },
      },
    },
  }),
});

@post
http://localhost:4000/graphql
{
    "query": "{hello}"
}

//response
{
    "data": {
        "hello": "Hello world!"
    }
}

@get
http://localhost:4000/graphql?query=hello

http://localhost:3000/info?query={getUser(id:1){name}}

@post
http://localhost:3000/info

{
	query: {
		getUser(id:1) {
			name
		}
	}
}

const { buildSchema } = require("graphql");

let schema = buildSchema(
  `
        input LoginInfo {
            name: String,
            passwd: String,
            captcha: String
        }

        type User {
            id: ID,
            name: String,
            sex: String
        }

        type Query {
            getUser(id: ID): User
        }

        type Mutation {
            login(user: LoginInfo): Boolean
            register(user: LoginInfo): Int 
        }
    `
);

const fakeDatabase = {};

class User {
  constructor(id, name, passwd) {
    this.id = id;
    this.name = name;
  }
}

const root = {
  getUser: ({ id }) => {
    let user = fakeDatabase[id];
    if (!user) {
      throw new Error("404");
    }

    return new User(user.id, user.name);
  },
  login: ({ loginInfo }) => {
    if (!loginInfo.captcha) throw new Error("captcha error");
    if (!loginInfo.name || !loginInfo.passwd) throw new Error("params error");

    for (let o in fakeDatabase) {
      if (o.name === loginInfo.name && o.passwd === loginInfo.passwd)
        return true;
    }

    return false;
  },
  register: ({ loginInfo }) => {
    if (!loginInfo.captcha) throw new Error("captcha error");
    if (!loginInfo.name || !loginInfo.passwd) throw new Error("params error");

    for (let o in fakeDatabase) {
      if (o.name === loginInfo.name) {
        throw new Error("name repeat");
      }
    }

    //build id
    var id = require("crypto").randomBytes(10).toString("hex");
    fakeDatabase({
      id,
      name: loginInfo.name,
      passwd: loginInfo.passwd,
    });

    return 1;
  },
};

module.exports = {
  schema,
  root,
};

const { schema, root } = require("../common/graphql/login");

router.use(
  "/info",
  graphqlHTTP({
    schema: schema,
    rootValue: root,
    graphiql: true,
  })
);