Menjalankan alur kerja untuk aplikasi callback

Aplikasi web untuk mendukung alur kerja terjemahan yang menunggu input manusia dan menggunakan endpoint callback.

Mempelajari lebih lanjut

Untuk dokumentasi mendetail yang menyertakan contoh kode ini, lihat artikel berikut:

• Membuat alur kerja yang memerlukan interaksi manusia menggunakan callback

Contoh kode

Node.js

Sebelum mencoba contoh ini, ikuti petunjuk penyiapan Node.js di Panduan memulai Workflows menggunakan library klien. Untuk mengetahui informasi selengkapnya, lihat dokumentasi referensi API Node.js Workflows.

Untuk melakukan autentikasi ke Workflows, siapkan Kredensial Default Aplikasi. Untuk mengetahui informasi selengkapnya, lihat Menyiapkan autentikasi untuk lingkungan pengembangan lokal.

document.addEventListener("DOMContentLoaded", async function (event) {
    const textArea = document.getElementById("text");
    textArea.focus();

    const newBtn = document.getElementById("newBtn");
    newBtn.addEventListener("sl-focus", event => {
        event.target.blur();
        window.location.reload();
    });

    const translationAlert = document.getElementById("translation");
    const buttonRow = document.getElementById("buttonRow");

    var callbackUrl = "";

    const validationAlert = document.getElementById("validationAlert");
    const rejectionAlert = document.getElementById("rejectionAlert");
    const validateBtn = document.getElementById("validateBtn");
    const rejectBtn = document.getElementById("rejectBtn");

    const translateBtn = document.getElementById("translateBtn");
    translateBtn.addEventListener("sl-focus", async event => {
        event.target.disabled = true;
        event.target.loading = true;
        textArea.disabled = true;

        console.log("Text to translate = ", textArea.value);

        const fnUrl = UPDATE_ME;

        try {
            console.log("Calling workflow executor function...");
            const resp = await fetch(fnUrl, {
                method: "POST",
                headers: {
                    "accept": "application/json",
                    "content-type": "application/json"
                },
                body: JSON.stringify({ text: textArea.value })
            });
            const executionResp = await resp.json();
            const executionId = executionResp.executionId.slice(-36);
            console.log("Execution ID = ", executionId);

            const db = firebase.firestore();
            const translationDoc = db.collection("translations").doc(executionId);

            var translationReceived = false;
            var callbackReceived =  false;
            var approvalReceived = false;
            translationDoc.onSnapshot((doc) => {
                console.log("Firestore update", doc.data());
                if (doc.data()) {
                    if ("translation" in doc.data()) {
                        if (!translationReceived) {
                            console.log("Translation = ", doc.data().translation);
                            translationReceived = true;
                            translationAlert.innerText = doc.data().translation;
                            translationAlert.open = true;
                        }
                    }
                    if ("callback" in doc.data()) {
                        if (!callbackReceived) {
                            console.log("Callback URL = ", doc.data().callback);
                            callbackReceived = true;
                            callbackUrl = doc.data().callback;
                            buttonRow.style.display = "block";
                        }
                    }
                    if ("approved" in doc.data()) {
                        if (!approvalReceived) {
                            const approved = doc.data().approved;
                            console.log("Approval received = ", approved);
                            if (approved) {
                                validationAlert.open = true;
                                buttonRow.style.display = "none";
                                newBtn.style.display = "inline-block";   
                            } else {
                                rejectionAlert.open = true;
                                buttonRow.style.display = "none";
                                newBtn.style.display = "inline-block";
                            }
                            approvalReceived = true;
                        }
                    }
                }
            });
        } catch (e) {
            console.log(e);
        }
        event.target.loading = false;
    });

    validateBtn.addEventListener("sl-focus", async event => {
        validateBtn.disabled = true;
        rejectBtn.disabled = true;
        validateBtn.loading = true;
        validateBtn.blur();

        // call callback
        await callCallbackUrl(callbackUrl, true);
    });

    rejectBtn.addEventListener("sl-focus", async event => {
        rejectBtn.disabled = true;
        validateBtn.disabled = true;
        rejectBtn.loading = true;
        rejectBtn.blur();

        // call callback
        await callCallbackUrl(callbackUrl, false);
    });

});

async function callCallbackUrl(url, approved) {
    console.log("Calling callback URL with status = ", approved);

    const fnUrl = UPDATE_ME;
    try {
        const resp = await fetch(fnUrl, {
            method: "POST",
            headers: {
                "accept": "application/json",
                "content-type": "application/json"
            },
            body: JSON.stringify({ url, approved })
        });
        const result = await resp.json();
        console.log("Callback answer = ", result);
    } catch(e) {
        console.log(e);
    }
}

Langkah berikutnya

Untuk menelusuri dan memfilter contoh kode untuk produk Google Cloud lainnya, lihat browser contohGoogle Cloud .