我们正在开发使用新的Firebase云功能的应用程序。当前正在发生的事情是将事务放入队列节点中。然后函数删除该节点并将其放入正确的节点。由于能够脱机工作，因此已经实现了该功能。

我们当前的问题是功能的速度。该函数本身大约需要400毫秒，所以没关系。但是有时该功能需要很长时间（大约8秒），而该条目已被添加到队列中。

我们怀疑服务器需要花费一些时间来启动，因为在第一个操作之后我们再次执行该操作。它花费的时间更少。

有什么办法可以解决这个问题？在这里，我添加了我们函数的代码。我们怀疑它没有问题，但是为了以防万一，我们添加了它。

const functions = require('firebase-functions');
const admin = require('firebase-admin');
const database = admin.database();

exports.insertTransaction = functions.database
    .ref('/userPlacePromotionTransactionsQueue/{userKey}/{placeKey}/{promotionKey}/{transactionKey}')
    .onWrite(event => {
        if (event.data.val() == null) return null;

        // get keys
        const userKey = event.params.userKey;
        const placeKey = event.params.placeKey;
        const promotionKey = event.params.promotionKey;
        const transactionKey = event.params.transactionKey;

        // init update object
        const data = {};

        // get the transaction
        const transaction = event.data.val();

        // transfer transaction
        saveTransaction(data, transaction, userKey, placeKey, promotionKey, transactionKey);
        // remove from queue
        data[`/userPlacePromotionTransactionsQueue/${userKey}/${placeKey}/${promotionKey}/${transactionKey}`] = null;

        // fetch promotion
        database.ref(`promotions/${promotionKey}`).once('value', (snapshot) => {
            // Check if the promotion exists.
            if (!snapshot.exists()) {
                return null;
            }

            const promotion = snapshot.val();

            // fetch the current stamp count
            database.ref(`userPromotionStampCount/${userKey}/${promotionKey}`).once('value', (snapshot) => {
                let currentStampCount = 0;
                if (snapshot.exists()) currentStampCount = parseInt(snapshot.val());

                data[`userPromotionStampCount/${userKey}/${promotionKey}`] = currentStampCount + transaction.amount;

                // determines if there are new full cards
                const currentFullcards = Math.floor(currentStampCount > 0 ? currentStampCount / promotion.stamps : 0);
                const newStamps = currentStampCount + transaction.amount;
                const newFullcards = Math.floor(newStamps / promotion.stamps);

                if (newFullcards > currentFullcards) {
                    for (let i = 0; i < (newFullcards - currentFullcards); i++) {
                        const cardTransaction = {
                            action: "pending",
                            promotion_id: promotionKey,
                            user_id: userKey,
                            amount: 0,
                            type: "stamp",
                            date: transaction.date,
                            is_reversed: false
                        };

                        saveTransaction(data, cardTransaction, userKey, placeKey, promotionKey);

                        const completedPromotion = {
                            promotion_id: promotionKey,
                            user_id: userKey,
                            has_used: false,
                            date: admin.database.ServerValue.TIMESTAMP
                        };

                        const promotionPushKey = database
                            .ref()
                            .child(`userPlaceCompletedPromotions/${userKey}/${placeKey}`)
                            .push()
                            .key;

                        data[`userPlaceCompletedPromotions/${userKey}/${placeKey}/${promotionPushKey}`] = completedPromotion;
                        data[`userCompletedPromotions/${userKey}/${promotionPushKey}`] = completedPromotion;
                    }
                }

                return database.ref().update(data);
            }, (error) => {
                // Log to the console if an error happened.
                console.log('The read failed: ' + error.code);
                return null;
            });

        }, (error) => {
            // Log to the console if an error happened.
            console.log('The read failed: ' + error.code);
            return null;
        });
    });

function saveTransaction(data, transaction, userKey, placeKey, promotionKey, transactionKey) {
    if (!transactionKey) {
        transactionKey = database.ref('transactions').push().key;
    }

    data[`transactions/${transactionKey}`] = transaction;
    data[`placeTransactions/${placeKey}/${transactionKey}`] = transaction;
    data[`userPlacePromotionTransactions/${userKey}/${placeKey}/${promotionKey}/${transactionKey}`] = transaction;
}