將向 PubSub 發布消息的 Cloud Function（由 HTTP 觸發）

Question

我正在嘗試在 Cloud Function 中創建 HTTP API - 最終發布了一條消息 t PubSub。 明白了，有 PubSub REST API - 但它強制我設置身份驗證（在客戶端） - 我想跳過並將其移動到服務器端。

下面的代碼被部署為谷歌雲函數，使用這個命令gcloud functions deploy helloGET --runtime nodejs8 --trigger-http

但是在瀏覽器中測試時，它出錯了Error: could not handle the request任何建議表示贊賞，謝謝！

"use strict";

// [START functions_pubsub_setup]
const { PubSub } = require("@google-cloud/pubsub");

// Instantiates a client
const pubsub = new PubSub();
// [END functions_pubsub_setup]

const Buffer = require("safe-buffer").Buffer;

exports.helloGET = (req, res) => {
  const topic = pubsub.topic("projects/myproject/topics/openit");

  const message = {
    data: {
      message: "req.body.message"
    }
  };

  // Publishes a message
  res.send(
    topic
      .publish(message)
      .then(() => res.status(200).send("Message published."))
      .catch(err => {
        err = `Catch block  ... ${err}`;
        console.error(err);
        res.status(500).send(err);
        return Promise.reject(err);
      })
  );
};

Answer 1

下面的代碼將起作用。 但是訂閱者需要大約 30 秒或更長時間才能接收到事件 - 對於我的用例來說太慢了：S

"use strict";
const { PubSub } = require("@google-cloud/pubsub");
const pubsub = new PubSub();
const Buffer = require("safe-buffer").Buffer;

exports.helloGET = async (req, res) => {
  var toPublish = `hello ${Date.now()}`;
  publishMessage("_REPLACE_WITH_TOPIC_NAME_", toPublish);
  res.send(`Published ${toPublish}`);
};

async function publishMessage(topicName, data) {
  console.log("=> publishMessage, data = ", data);
  const dataBuffer = Buffer.from(data);
  const topic = pubsub.topic(topicName);
  const publisher = topic.publisher();
  publisher.publish(dataBuffer, { a: "XYZ" }, function() {
    console.log("Published eventually ...");
  });
}