GraphQL Federation Nodemon 在重启时中断网关

Question

我正在努力设置我的 GraphQL Federation 开发环境。 我有一些服务，我希望服务器在文件更改时自动重新启动。 我正在使用 Typescript，因此 Typescript 必须先转换到 dist 文件夹，然后 nodemon 应该重新启动发生更改的服务。

我在我的 package.json 文件中创建了以下设置：

"dev": "concurrently -k \"tsc -w\" \"npm:dev:*\"",
"dev:accounts": "nodemon -r dotenv/config -r esm --watch ./dist/services/accounts ./dist/services/accounts/index.js",
"dev:profiles": "nodemon -r dotenv/config -r esm --watch ./dist/services/profiles ./dist/services/profiles/index.js",
"dev:gateway": "wait-on tcp:4001 tcp:4002 && nodemon -r dotenv/config -r esm ./dist/index.js"

---

这在我运行npm run dev时开始工作 - 帐户和配置文件服务启动，一旦它们运行，网关就会启动。 但是，一旦 Typescript 完成转译，nodemon 会重新启动所有服务和网关，因为 dist 文件夹中的文件已更改。

这是问题所在。 nodemon独立重启服务和网关，网关重启速度较快，说明网关先于服务运行，导致如下错误：

[dev:gateway] Error checking for changes to service definitions: Couldn't load service definitions for "profiles" at http://localhost:4002: request to http://localhost:4002/ failed, reason: connect ECONNREFUSED 127.0.0.1:4002    
[dev:gateway] This data graph is missing a valid configuration. Couldn't load service definitions for "profiles" at http://localhost:4002: request to http://localhost:4002/ failed, reason: connect ECONNREFUSED 127.0.0.1:4002

每当 nodemon 执行重启时，我不知道如何告诉 nodemon 等到每个服务都重启！

因为现在等待仅适用于npm run dev的第一次初始执行。 之后，对于每次更改，nodemon 负责重新启动并且不关心等待。

---

这是整个火车残骸：

$ npm 运行开发

> my-app@1.0.0 dev
> concurrently -k "tsc -w" "npm:dev:*"

17:08:48 - Starting compilation in watch mode...

[dev:accounts] > my-app@1.0.0 dev:accounts
[dev:accounts] > nodemon -r dotenv/config -r esm --watch ./dist/services/accounts ./dist/services/accounts/index.js

[dev:gateway] > my-app@1.0.0 dev:gateway
[dev:gateway] > wait-on tcp:4001 tcp:4002 && nodemon -r dotenv/config -r esm ./dist/index.js

[dev:profiles] > my-app@1.0.0 dev:profiles
[dev:profiles] > nodemon -r dotenv/config -r esm --watch ./dist/services/profiles ./dist/services/profiles/index.js

[dev:accounts] [nodemon] 2.0.7
[dev:accounts] [nodemon] to restart at any time, enter `rs`
[dev:accounts] [nodemon] watching path(s): dist/services/accounts/**/*
[dev:accounts] [nodemon] watching extensions: js,mjs,json
[dev:accounts] [nodemon] starting `node -r dotenv/config -r esm ./dist/services/accounts/index.js`

[dev:profiles] [nodemon] 2.0.7
[dev:profiles] [nodemon] to restart at any time, enter `rs`
[dev:profiles] [nodemon] watching path(s): dist/services/profiles/**/*
[dev:profiles] [nodemon] watching extensions: js,mjs,json
[dev:profiles] [nodemon] starting `node -r dotenv/config -r esm ./dist/services/profiles/index.js`

[dev:accounts] Accounts service ready at http://localhost:4001/
[dev:profiles] Profiles service ready at http://localhost:4002/

[dev:gateway] [nodemon] 2.0.7
[dev:gateway] [nodemon] to restart at any time, enter `rs`
[dev:gateway] [nodemon] watching path(s): *.*
[dev:gateway] [nodemon] watching extensions: js,mjs,json
[dev:gateway] [nodemon] starting `node -r dotenv/config -r esm ./dist/index.js`

[dev:gateway] 🚀 Server started at http://localhost:4000/graphql

[dev:accounts] > my-app@1.0.0 dev:accounts
[dev:accounts] > nodemon -r dotenv/config -r esm --watch ./dist/services/accounts ./dist/services/accounts/index.js

[dev:gateway] > my-app@1.0.0 dev:gateway
[dev:gateway] > wait-on tcp:4001 tcp:4002 && nodemon -r dotenv/config -r esm ./dist/index.js

[dev:profiles] > my-app@1.0.0 dev:profiles
[dev:profiles] > nodemon -r dotenv/config -r esm --watch ./dist/services/profiles ./dist/services/profiles/index.js

[dev:accounts] [nodemon] 2.0.7
[dev:accounts] [nodemon] to restart at any time, enter `rs`
[dev:accounts] [nodemon] watching path(s): dist/services/accounts/**/*
[dev:accounts] [nodemon] watching extensions: js,mjs,json
[dev:accounts] [nodemon] starting `node -r dotenv/config -r esm ./dist/services/accounts/index.js`

[dev:profiles] [nodemon] 2.0.7
[dev:profiles] [nodemon] to restart at any time, enter `rs`
[dev:profiles] [nodemon] watching path(s): dist/services/profiles/**/*
[dev:profiles] [nodemon] watching extensions: js,mjs,json
[dev:profiles] [nodemon] starting `node -r dotenv/config -r esm ./dist/services/profiles/index.js`

[dev:accounts] Accounts service ready at http://localhost:4001/

[dev:profiles] Profiles service ready at http://localhost:4002/

[dev:gateway] [nodemon] 2.0.7
[dev:gateway] [nodemon] to restart at any time, enter `rs`
[dev:gateway] [nodemon] watching path(s): *.*
[dev:gateway] [nodemon] watching extensions: js,mjs,json
[dev:gateway] [nodemon] starting `node -r dotenv/config -r esm ./dist/index.js`

[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:accounts] [nodemon] restarting due to changes...
[dev:accounts] [nodemon] restarting due to changes...
[dev:accounts] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:profiles] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...

Typescript doing stuff...
[0] 17:08:57 - Found 226 errors. Watching for file changes.

[dev:profiles] [nodemon] restarting due to changes...
[dev:profiles] [nodemon] restarting due to changes...
[dev:profiles] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] starting `node -r dotenv/config -r esm ./dist/index.js`
[dev:profiles] [nodemon] restarting due to changes...
[dev:accounts] [nodemon] restarting due to changes...
[dev:accounts] [nodemon] restarting due to changes...
[dev:accounts] [nodemon] starting `node -r dotenv/config -r esm ./dist/services/accounts/index.js`
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:profiles] [nodemon] starting `node -r dotenv/config -r esm ./dist/services/profiles/index.js`
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:profiles] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:profiles] [nodemon] starting `node -r dotenv/config -r esm ./dist/services/profiles/index.js`
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...
[dev:gateway] [nodemon] restarting due to changes...

[dev:gateway] [nodemon] starting `node -r dotenv/config -r esm ./dist/index.js`

[dev:accounts] Accounts service ready at http://localhost:4001/

[dev:gateway] 🚀 Server started at http://localhost:4000/graphql

[dev:gateway] Error checking for changes to service definitions: Couldn't load service definitions for "profiles" at http://localhost:4002: request to http://localhost:4002/ failed, reason: connect ECONNREFUSED 127.0.0.1:4002

[dev:gateway] This data graph is missing a valid configuration. Couldn't load service definitions for "profiles" at http://localhost:4002: request to http://localhost:4002/ failed, reason: connect ECONNREFUSED 127.0.0.1:4002

[dev:profiles] Profiles service ready at http://localhost:4002/

---

我希望这是可以理解的，我期待有关如何解决此问题的任何建议。

谢谢，马库斯

Answer 1

尝试在您的代码中而不是在 package.json 脚本中使用等待。 确保使用等待代码包装您的网关服务器。 例子：

import waitOn from 'wait-on'
import app from './config/app'
import server from './config/apollo'

const port = process.env.PORT

const options = {
  resources: ['tcp:4001'],
}

waitOn(options)
  .then(() => {
    server.applyMiddleware({ app })
    app.listen({ port }, () => {
      console.log(
        `Server ready at http://localhost:${port}${server.graphqlPath}`
      )
    })
  })
  .catch((err) => {
    console.error('ERR:', err)
  })