使用lua graphql 模块让openresty 支持graphql api
graphql 是一个很不错的api 查询标准语言，已经有一个lua 的版本支持graphql
项目使用docker&&docker-compose 运行
环境准备
- 模块安装
luarocks install graphql- docker镜像准备
模块使用luarocks 安装，默认alpine 镜像是没有安装这个包，我们使用alpine-fat的
FROM openresty/openresty:alpine-fat
RUN /usr/local/openresty/luajit/bin/luarocks install graphql项目代码
- 项目结构
├── Dockerfile
├── README.md
├── app
├── docker-compose.yaml
└── nginx.conf- nginx.conf
worker_processes 1;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
lua_code_cache off;
gzip on;
real_ip_header X-Forwarded-For;
real_ip_recursive on;
lua_package_path '/opt/app/?.lua;;';
server {
listen 80;
server_name localhost;
charset utf-8;
root html;
default_type text/html;
location / {
content_by_lua_block {
require("html/app")()
}
}
# graphql 支持
location /g {
more_set_headers 'Content-Type application/json';
content_by_lua_block {
require("g/init")()
}
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
}
- graphql 代码
app/g/init.lua
local parse = require 'graphql.parse'
local schema = require 'graphql.schema'
local types = require 'graphql.types'
local validate = require 'graphql.validate'
local execute = require 'graphql.execute'
local json = require "cjson"
-- Parse a query
local ast = parse [[
query getUser($id: ID) {
person(id: $id) {
firstName
lastName
}
}
]]
-- Create a type
local Person = types.object {
name = 'Person',
fields = {
id = types.id.nonNull,
firstName = types.string.nonNull,
middleName = types.string,
lastName = types.string.nonNull,
age = types.int.nonNull
}
}
-- Create a schema
local schema = schema.create {
query = types.object {
name = 'Query',
fields = {
person = {
kind = Person,
arguments = {
id = types.id
},
resolve = function(rootValue, arguments)
if arguments.id ~= 1 then return nil end
return {
id = 1,
firstName = 'Bob',
lastName = 'Ross',
age = 52
}
end
}
}
}
}
-- Validate a parsed query against a schema
validate(schema, ast)
-- Execution
local rootValue = {}
local variables = { id = 1 }
local operationName = 'getUser'
local function g()
local result=execute(schema, ast, rootValue, variables, operationName)
ngx.say(json.encode(result))
end
return g运行
- build 镜像
docker-compose build- 运行
docker-compose up -d- 效果
