7.6 KiB
Application
Overview
Web Service
NocoBase Application is a web framework implemented based on Koa, compatible with Koa API.
// index.js
const { Application } = require('@nocobase/server');
// Create App instance and configure the database
const app = new Application({
database: {
dialect: 'sqlite',
storage: ':memory:',
}
});
// Register middleware, response to requests
app.use(async ctx => {
ctx.body = 'Hello World';
});
// Run in the CLI mode
app.runAsCLI();
After running node index.js start
in CLI to start service, use curl
to request service.
$> curl localhost:3000
Hello World
CLI Tool
NocoBase Application has a built-in cli commander
, which can be run as CLI tool.
// cmd.js
const {Application} = require('@nocobase/server');
const app = new Application({
database: {
dialect: 'sqlite',
storage: ':memory:',
}
});
app.cli.command('hello').action(async () => {
console.log("hello world")
});
app.runAsCLI()
Run in CLI:
$> node cmd.js hello
hello world
Inject Plugin
NocoBase Application is designed as a highly extensible framework, plugins can be written and injected to extend the functionality of the application. For example, the above-mentioned Web service can be replaced with a plugin.
const { Application, Plugin } = require('@nocobase/server');
// Write plugin by inheriting the Plugin class
class HelloWordPlugin extends Plugin {
load() {
this.app.use(async (ctx, next) => {
ctx.body = "Hello World";
})
}
}
const app = new Application({
database: {
dialect: 'sqlite',
storage: ':memory:',
}
});
// Inject plugin
app.plugin(HelloWordPlugin, { name: 'hello-world-plugin'} );
app.runAsCLI()
More Examples
Please refer to the detailed guides of plugin development. Read more examples of the Application class.
Life Cycle
Depending on the running mode, the Application has three life cycle stages.
Install
Use the install
command in cli
to invoke the installation. Generally, if needs to write new tables or data to the database before using the plugin, you need to do it during installation. Installation is also required when using NocoBase for the first time.
- Call the
load
method to load registered plugins. - Trigger the
beforeInstall
event. - Call the
db.sync
method to synchronize database. - Call the
pm.install
method to execute theinstall
methods of registered plugins. - Write the version of
nocobase
. - Trigger the
afterInstall
event. - Call the
stop
method to end installation.
Start
Use the start
command in cli
to start NocoBase Web service.
- Call the
load
method to load registered plugins. - Call the
start
medthod:- Trigger the
beforeStart
event - Start port listening
- Trigger the
afterStart
event
- Trigger the
Upgrade
Use the upgrade
command in cli
to upgrade NocoBase Web service when needed.
- Call the
load
method to load registered plugins. - Trigger the
beforeUpgrade
event. - Call the
db.migrator.up
method to migrate database. - Call the
db.sync
method to synchronize database. - Call the
version.update
method to update the version ofnocobase
. - Trigger the
afterUpgrade
event. - Call the
stop
medthod to end upgrade.
构造函数
constructor()
创建一个应用实例。
签名
constructor(options: ApplicationOptions)
参数
参数名 | 类型 | 默认值 | 描述 |
---|---|---|---|
options.database |
IDatabaseOptions or Database |
{} |
数据库配置 |
options.resourcer |
ResourcerOptions |
{} |
资源路由配置 |
options.logger |
AppLoggerOptions |
{} |
日志 |
options.cors |
CorsOptions |
{} |
跨域配置,参考 @koa/cors |
options.dataWrapping |
boolean |
true |
是否包装响应数据,true 则将把通常的 ctx.body 包装为 { data, meta } 的结构。 |
options.registerActions |
boolean |
true |
是否注册默认的 actions |
options.i18n |
I18nOptions |
{} |
国际化配置,参考 i18next |
options.plugins |
PluginConfiguration[] |
[] |
默认启用的插件配置 |
Type
interface ApplicationOptions {
}
实例成员
cli
命令行工具实例,参考 npm 包 Commander。
db
数据库实例,相关 API 参考 Database。
resourcer
应用初始化自动创建的资源路由管理实例,相关 API 参考 Resourcer。
acl
ACL 实例,相关 API 参考 ACL。
logger
Winston 实例,相关 API 参考 Winston。
i18n
I18next 实例,相关 API 参考 I18next。
pm
插件管理器实例,相关 API 参考 PluginManager。
version
应用版本实例,相关 API 参考 ApplicationVersion。
middleware
内置的中间件有:
- logger
- i18next
- bodyParser
- cors
- dataWrapping
- db2resource
- restApiMiddleware
context
继承自 koa 的 context,可以通过 app.context
访问,用于向每个请求注入上下文可访问的内容。参考 Koa Context。
NocoBase 默认对 context 注入了以下成员,可以在请求处理函数中直接使用:
变量名 | 类型 | 描述 |
---|---|---|
ctx.app |
Application |
应用实例 |
ctx.db |
Database |
数据库实例 |
ctx.resourcer |
Resourcer |
资源路由管理器实例 |
ctx.action |
Action |
资源操作相关对象实例 |
ctx.logger |
Winston |
日志实例 |
ctx.i18n |
I18n |
国际化实例 |
ctx.t |
i18n.t |
国际化翻译函数快捷方式 |
ctx.getBearerToken() |
Function |
获取请求头中的 bearer token |
实例方法
use()
注册中间件,兼容所有 Koa 插件
on()
订阅应用级事件,主要与生命周期相关,等同于 eventEmitter.on()
。所有可订阅事件参考 事件。
command()
自定义 command
findCommand()
查找已定义 command
runAsCLI()
以 CLI 的方式运行。
load()
加载应用配置。
签名
async load(): Promise<void>
reload()
重载应用配置。
install()
初始化安装应用,同步安装插件。
upgrade()
升级应用,同步升级插件。
start()
启动应用,如果配置了监听的端口,将启动监听,之后应用即可接受 HTTP 请求。
签名
async start(options: StartOptions): Promise<void>
参数
参数名 | 类型 | 默认值 | 描述 |
---|---|---|---|
options.listen? |
ListenOptions |
{} |
HTTP 监听参数对象 |
options.listen.port? |
number |
13000 | 端口 |
options.listen.host? |
string |
'localhost' |
域名 |
stop()
停止应用,此方法会关闭数据库连接,关闭 HTTP 端口,不会删除数据。
destroy()
删除应用,此方法会删除应用对应的数据库。