如何處理來自firebase云功能的asyc/await資料

我試圖學習如何在云功能中從 firestore 查詢資料，但我一直卡住。

由于某些奇怪的原因，我不能使用 async/await...

我的目標是查詢集合“聊天”以獲取檔案 ID 為“chatId”的檔案并獲取“作業用戶資料”的值（見下圖）

exports.onChatMessageCreate = functions.firestore
    .document("chat messages/{docId}")
    .onCreate( (snapshot, context) => {
      const snapData = snapshot.data();
      const userName = snapData["userName"];
      // fetch user to send message to
      const chatId = snapData["Chat id"];

      // eslint-disable-next-line max-len
      const collectionRef = admin.firestore().collection("chat").doc(chatId).get().then( (value)=> console.log(value));
      console.log("below::");
      console.log(collectionRef);

      const payload = {
        // eslint-disable-next-line max-len
        notification: {title: userName, body: snapshot.data()["Chat message"], sound: "default"},
        // eslint-disable-next-line max-len
        data: {click_action: "FLUTTER_NOTIFICATION_CLICK", message: "Sample Push Message"},
      };

      try {
        admin.messaging().sendToDevice(tokens, payload);
        console.log("NOTIFICATION SEND SUCCESFULLY");
      } catch (e) {
        console.log("ERROR SENDING NOTIFICATION");
        console.log(e);
      }
    });

這是firebase日志的影像::

我嘗試了以下代碼，但由于異步而出現錯誤

exports.onChatMessageCreate = functions.firestore
  .document("chat messages/{docId}")
  .onCreate(async (snapshot, context) => {   // ERROR FROM ASYNC
    const snapData = snapshot.data();
    const userName = snapData["userName"];
    // fetch user to send message to
    const chatId = snapData["Chat id"];

    const docSnapshot = await admin.firestore().collection("chat").doc(chatId).get()

    const data = docSnapshot.data()
    console.log(data)

    const payload = {
      notification: {
        title: userName,
        body: data["Chat message"],
        sound: "default"
      },
      data: {
        click_action: "FLUTTER_NOTIFICATION_CLICK",
        message: "Sample Push Message"
      },
    };

    return await admin.messaging().sendToDevice(tokens, payload);
  });

這是錯誤::

i  deploying functions
Running command: npm --prefix "$RESOURCE_DIR" run lint

> lint
> eslint .


/Users/juan/StudioProjects/mynotes/functions/index.js
  22:39  error  Parsing error: Unexpected token =>

? 1 problem (1 error, 0 warnings)


Error: functions predeploy error: Command terminated with non-zero exit code 1

Having trouble? Try firebase [command] --help
juan@juans-Air mynotes % firebase [command] --help
zsh: no matches found: [command]
juan@juans-Air mynotes % firebase [command] --help
zsh: no matches found: [command]
juan@juans-Air mynotes % (cd functions && npx eslint . --fix)
firebase deploy

/Users/juan/StudioProjects/mynotes/functions/index.js
  22:39  error  Parsing error: Unexpected token =>

? 1 problem (1 error, 0 warnings)


=== Deploying to 'mynotes-b58d2'...

i  deploying functions
Running command: npm --prefix "$RESOURCE_DIR" run lint

> lint
> eslint .


/Users/juan/StudioProjects/mynotes/functions/index.js
  22:39  error  Parsing error: Unexpected token =>

? 1 problem (1 error, 0 warnings)


Error: functions predeploy error: Command terminated with non-zero exit code 1

Having trouble? Try firebase [command] --help
juan@juans-Air mynotes % 

這是一張照片

uj5u.com熱心網友回復：

1. 中的代碼then()將在回傳的承諾get()解決后執行。但是，代碼仍在繼續，因此記錄的值是一個未解決的 Promise。
2. 該sendToDevice()函式還回傳一個承諾，因此您也必須處理它。
3. 您必須回傳終止后臺 Cloud Function 的承諾，否則您可能會收到超時錯誤。

嘗試重構代碼，如下所示：

exports.onChatMessageCreate = functions.firestore
  .document("chat messages/{docId}")
  .onCreate(async (snapshot, context) => {
    const snapData = snapshot.data();
    const userName = snapData["userName"];
    // fetch user to send message to
    const chatId = snapData["Chat id"];

    const docSnapshot = await admin.firestore().collection("chat").doc(chatId).get()

    const data = docSnapshot.data()
    console.log(data)

    const payload = {
      notification: {
        title: userName,
        body: data["Chat message"],
        sound: "default"
      },
      data: {
        click_action: "FLUTTER_NOTIFICATION_CLICK",
        message: "Sample Push Message"
      },
    };

    return await admin.messaging().sendToDevice(tokens, payload);
  });

標籤：Google Cloud Collective 节点.js火力基地谷歌云功能

上一篇：NodeJS獲取不等待

下一篇：在Python中更新字典