[使用Node.js和Firebase Cloudstore在Cloud Functions中生成和发送电子邮件pdf

Question

我在云函数中具有以下代码，每当用户下订单时就会触发。然后，我想使用Firebase存储以pdf格式生成发票，然后通过电子邮件将pdf发送给用户。我很难获取pdf生成文件，因为我不确定我应该怎么做。下订单后，电子邮件将毫无问题地发送给用户。我知道如何在下面的mailoptions中添加附件，但无法弄清楚如何创建pdf并插入产品信息。

// Triggers once the user place an order
exports.notifyUserOfOrderConfirmation = functions.firestore.document('masterOrders/{masterOrderId}').onCreate((snap, context) => {

    const data = snap.data();
    const orderedUserEmail = data.userEmail;
    const customerOrderId = data.customerOrderId;
    const userId = data.userId;
    const masterOrderId = context.params.masterOrderId;

    return orderProductsQuery(data, masterOrderId, orderedUserEmail, customerOrderId, userId)

});

// Query the firestore to get the ordered products
function orderProductsQuery(data, masterOrderId, orderedUserEmail, customerOrderId, userId) {

    return db.collection('users').doc(userId).collection('orders').doc(customerOrderId).collection('orderCart').get().then(snap => {
        const orderedProducts = [];
        snap.forEach(doc => {
            const productData = doc.data();
            orderedProducts.push(productData);
        })

        // return notifyUserOfOrderConfirmation(data, masterOrderId, orderedUserEmail, customerOrderId, orderedProducts)
        return generatePDF(data, masterOrderId, orderedUserEmail, customerOrderId, orderedProducts)

    }).catch((err) => {
        console.log('Error getting documents', err);
        return Promise.reject(err);
    })
}

这是我需要帮助的地方；下面的代码是我到目前为止编写的：

const pdfkit = require("pdfkit");
const Storage  = require('@google-cloud/storage');

// Creates a client
const storage = new Storage ({projectId: MYPROJECTID});

// Lists all buckets in the current project
const buckets = storage.getBuckets();

function generatePDF(data, masterOrderId, orderedUserEmail, customerOrderId, orderedProducts) {
    const doc = new pdfkit();
    const filename = `/${customerOrderId}/test-` + Date.now() + '.pdf'; 
    const bucket = storage.bucket(MYBUCKETNAME)    
    const file = bucket.file(filename);
    const bucketFileStream = file.createWriteStream();

    doc.pipe(bucketFileStream);

    doc.end();

    bucketFileStream.on('finish', function () {
        return notifyUserOfOrderConfirmation(filename, data, masterOrderId, orderedUserEmail, customerOrderId, orderedProducts)
    });

    bucketFileStream.on("error", function (err) {
        console.error(err);
    });
}

这是我发送电子邮件的时间；我知道下面的代码在没有pdf代码的情况下也可以正常工作，因此在没有pdf的情况下发送电子邮件没有任何问题：

async function notifyUserOfOrderConfirmation(filename, data, masterOrderId, orderedUserEmail, customerOrderId, orderedProducts) {

    const bucket = storage.bucket(MYBUCKETNAME);
    const file = bucket.file(filename);    

    const mailOptions = {

        from: `${APP_NAME} <MYEMAIL>`,
        to: orderedUserEmail
    };

    mailOptions.subject = `Order Confirmation`;
    mailOptions.text = `We received your order. attached is your invoice`;

    mailOptions.attachments = [{
        filename: "test.pdf",
        content: file.createReadStream()
    }];

    await transporter.sendMail(mailOptions);
    console.log('New welcome email sent to:', orderedUserEmail);
    return null;
}

当我部署它时；我的部署没有任何错误。但是当我在应用程序中下订单时；我在firebase的功能中收到以下错误：

Error: socket hang up
    at TLSSocket.onHangUp (_tls_wrap.js:1148:19)
    at Object.onceWrapper (events.js:313:30)
    at emitNone (events.js:111:20)
    at TLSSocket.emit (events.js:208:7)
    at endReadableNT (_stream_readable.js:1064:12)
    at _combinedTickCallback (internal/process/next_tick.js:139:11)
    at process._tickDomainCallback (internal/process/next_tick.js:219:9)

Unhandled rejection

任何想法，这是什么问题，在这种情况下，我如何正确生成pdf？

Answer 1

想通了。上面的代码实际上是正确的，我只是在这里const file = bucket.file(filename);中使用了错误的文件名，因此此代码没有问题，对于想使用它来创建pdf和发送给用户的电子邮件的人来说，它就像一个魅力。