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@@ -25,7 +25,8 @@ Egg 的理念之一是`渐进式增强`,故我们为开发者提供`渐进升 | |
## 快速升级 | ||
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- Node.js 使用最新的 LTS 版本(`>=8.9.0`)。 | ||
- 执行 `egg-bin autod`,会自动升级 `egg` 的依赖为 `^2.0.0`,以及其他插件版本。 | ||
- 修改 `package.json` 中 `egg` 的依赖为 `^2.0.0`。 | ||
- 检查相关插件是否发布新版本(可选)。 | ||
- 重新安装依赖,跑单元测试。 | ||
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**搞定!不需要修改任何一行代码,就已经完成了升级。** | ||
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@@ -44,7 +45,9 @@ Egg 的理念之一是`渐进式增强`,故我们为开发者提供`渐进升 | |
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> 2.x 仍然保持对 1.x 风格的中间件的兼容,故不修改也能继续使用。 | ||
- 返回的函数入参改为 `(ctx, next)` 的形式。 | ||
- 返回的函数入参改为 Koa 2 的 `(ctx, next)` 风格。 | ||
- 第一个参数为 `ctx`,代表当前请求的上下文,是 [Context](./basics/extend.md#Context) 的实例。 | ||
- 第二个参数为 `next`,用 await 执行它来执行后续中间件的逻辑。 | ||
- 不建议使用 `async (ctx, next) => {}` 格式,避免错误堆栈丢失函数名。 | ||
- `yield next` 改为函数调用 `await next()` 的方式。 | ||
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@@ -63,7 +66,7 @@ module.exports = () => { | |
module.exports = () => { | ||
return async function responseTime(ctx, next) { | ||
const start = Date.now(); | ||
// 注意:函数调用 | ||
// 注意,和 generator function 格式的中间件不同,此时 next 是一个方法,必须要调用它 | ||
await next(); | ||
const delta = Math.ceil(Date.now() - start); | ||
ctx.set('X-Response-Time', delta + 'ms'); | ||
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@@ -84,7 +87,7 @@ module.exports = () => { | |
- generators (delegation) | ||
- generator functions (delegation) | ||
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而原生的 `yield` 和 `await` 只支持其中的一部分,故在移除 `co` 后,我们需要根据不同场景自行处理: | ||
尽管 `generator` 和 `async` 两者的编程模型基本一模一样,但由于上述的 `co` 的一些特殊处理,导致在移除 `co` 后,我们需要根据不同场景自行处理: | ||
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#### promise | ||
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@@ -177,10 +180,11 @@ const { news, user } = await app.toPromise(ctx.service.biz.list(topic, uid)); | |
- [toAsyncFunction][app.toAsyncFunction] 和 [toPromise][app.toPromise] 实际使用的是 [co] 包装,因此会带回对应的性能损失和堆栈问题,建议开发者还是尽量全链路升级。 | ||
- [toAsyncFunction][app.toAsyncFunction] 在调用 async function 时不会有损失。 | ||
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@sindresorhus 编写了许多[基于 promise 的 helper 方法](https://github.com/sindresorhus/promise-fun),灵活的运用它们配合 async function 能让代码更加具有可读性。 | ||
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## 插件升级 | ||
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`应用开发者`只需升级`插件开发者`修改后的依赖版本即可,可以用我们提供的命令 `egg-bin autod` 快速更新。 | ||
`应用开发者`只需升级`插件开发者`修改后的依赖版本即可,也可以用我们提供的命令 `egg-bin autod` 快速更新。 | ||
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以下内容针对`插件开发者`,指导如何升级插件: | ||
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@@ -231,6 +235,12 @@ task = app.toAsyncFunction(schedule.task); | |
- 修改 `README.md` 的示例为 async function。 | ||
- 修改 `test/fixtures` 为 async function,可选,建议分开另一个 PR 方便 Review。 | ||
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一般还会需要继续维护上一个版本,故需要: | ||
- 对上一个版本建立一个 `1.x` 这类的 branch 分支 | ||
- 修改上一个版本的 `package.json` 的 `publishConfig.tag` 为 `release-1.x` | ||
- 这样如果上一个版本有 BugFix 时,npm 版本时就会发布为 `release-1.x` 这个 tag,用户通过 `npm i [email protected]` 来引入旧版本。 | ||
- 参见 [npm 文档](https://docs.npmjs.com/cli/dist-tag)。 | ||
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[co]: https://github.com/tj/co | ||
[egg-schedule]: https://github.com/eggjs/egg-schedule | ||
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