grandstack graphql 工具基本试用

 

grandstack 是一个方便graphql 应用开发的工具

使用docker-compose 运行

环境准备

官方的starter 比较好，已是使用docker-compose 建立好了全部的依赖,可是目前使用的版本镜像有bug，我修改了版本，能够运行
参考github 项目 https://github.com/rongfengliang/grand-stack-starter

• clone starter

git clone https://github.com/grand-stack/grand-stack-starter.git

• docker-compose 文件

version: '3'
services:
  neo4j:
    build: ./neo4j
    ports:
      - 7474:7474
      - 7687:7687
    environment:
      - NEO4J_dbms_security_procedures_unrestricted=apoc.*
      - NEO4J_apoc_import_file_enabled=true
      - NEO4J_apoc_export_file_enabled=true
      - NEO4J_dbms_shell_enabled=true
  api:
    build: ./api
    ports:
      - 4000:4000
    links:
    - neo4j
    depends_on:
    - neo4j
  ui:
    build: ./ui
    ports:
      - 3000:3000
    links:
    - api
    depends_on:
    - api

starter 说明

由于grandstack 数据存储服务、查询服务使用的核心是neo4j 因此须要启动ne4j

• neo4j server

docker 配置比较简单，主要是插件添加以及一些简单的参数配置
Dockerfile
FROM neo4j:3.4.5

ENV NEO4J_AUTH=neo4j/letmein

ENV APOC_VERSION 3.4.0.2
ENV APOC_URI https://github.com/neo4j-contrib/neo4j-apoc-procedures/releases/download/${APOC_VERSION}/apoc-${APOC_VERSION}-all.jar
RUN wget -P /var/lib/neo4j/plugins ${APOC_URI}

ENV GRAPHQL_VERSION 3.4.0.1
ENV GRAPHQL_URI https://github.com/neo4j-graphql/neo4j-graphql/releases/download/${GRAPHQL_VERSION}/neo4j-graphql-${GRAPHQL_VERSION}.jar
RUN wget -P /var/lib/neo4j/plugins ${GRAPHQL_URI}

EXPOSE 7474 7473 7687

CMD ["neo4j"]

启动配置
  neo4j:
    build: ./neo4j
    ports:
      - 7474:7474
      - 7687:7687
    environment:
      - NEO4J_dbms_security_procedures_unrestricted=apoc.*
      - NEO4J_apoc_import_file_enabled=true
      - NEO4J_apoc_export_file_enabled=true
      - NEO4J_dbms_shell_enabled=true

• api server 配置

定义graphql api 的schema 以及使用ne4j 进行graphql 查询的转换
简单schenma，集成了neo4j 指令

type User {
  id: ID!
  name: String
  friends: [User] @relation(name: "FRIENDS", direction: "BOTH")
  reviews: [Review] @relation(name: "WROTE", direction: "OUT")
  avgStars: Float @cypher(statement: "MATCH (this)-[:WROTE]->(r:Review) RETURN toFloat(avg(r.stars))")
  numReviews: Int @cypher(statement: "MATCH (this)-[:WROTE]->(r:Review) RETURN COUNT(r)")
}
查询指令解析配置，很传统，比较简单
import { neo4jgraphql } from "neo4j-graphql-js";
import fs from 'fs';
import path from 'path';
export const typeDefs = 
  fs.readFileSync(process.env.GRAPHQL_SCHEMA || path.join(__dirname, "schema.graphql"))
    .toString('utf-8');

export const resolvers = {
  Query: {
    usersBySubstring: neo4jgraphql // resovler for neo4j
  }
};

graphql server 启动

import { typeDefs, resolvers } from "./graphql-schema";
import { ApolloServer, gql, makeExecutableSchema } from "apollo-server";
import { v1 as neo4j } from "neo4j-driver";
import { augmentSchema } from "neo4j-graphql-js";
import dotenv from "dotenv";

dotenv.config();

const schema = makeExecutableSchema({
  typeDefs,
  resolvers
});

// augmentSchema will add autogenerated mutations based on types in schema
const augmentedSchema = augmentSchema(schema);

const driver = neo4j.driver(
  process.env.NEO4J_URI || "bolt://localhost:7687",
  neo4j.auth.basic(
    process.env.NEO4J_USER || "neo4j",
    process.env.NEO4J_PASSWORD || "neo4j"
  )
);

const server = new ApolloServer({
  // using augmentedSchema (executable GraphQLSchemaObject) instead of typeDefs and resolvers
  //typeDefs,
  //resolvers,
  context: { driver },
  // remove schema and uncomment typeDefs and resolvers above to use original (unaugmented) schema
  schema: augmentedSchema
});

server.listen(process.env.GRAPHQL_LISTEN_PORT, '0.0.0.0').then(({ url }) => {
  console.log(`GraphQL API ready at ${url}`);
});

• UI

  基于react 的，也比较简单，就是集成graphql api

项目使用的react 脚手架生成的，主要是apollo-boost react-apollo的集成使用，同时项目使用了pwa
技术，仍是挺好的参考
UI/src/UserList.js 比较重要，包含了数据查询的使用，主要是apollo client 的使用

运行&&测试

• 启动服务

docker-compose  build
docker-compose up -d

• 访问测试

graphql api 地址
http://hostip:4000

添加数据

• neo4j 数据

• ui

说明

总的来讲集成neo4j 是很不错，由于graphql 作的就是graph 查询，neo4j 就是干这个的，可是从实际来讲neo4j 并非免费的（单机是，集群不是）
同时相似的一些图数据库已经直接集成了graphql 了好比dgraph 、startdog

参考资料

https://grandstack.io/docs/getting-started-grand-stack-starter.html
https://github.com/grand-stack/grand-stack-starter.git
https://github.com/rongfengliang/grand-stack-starter