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pubsub-out.js
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// Copyright 2019 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/* jshint esversion: 8 */
module.exports = function(RED) {
"use strict";
const STATUS_CONNECTED = {
fill: "green",
shape: "dot",
text: "connected"
};
const STATUS_DISCONNECTED = {
fill: "red",
shape: "dot",
text: "disconnected"
};
const STATUS_CONNECTING = {
fill: "yellow",
shape: "dot",
text: "connecting"
};
const STATUS_PUBLISHING = {
fill: "green",
shape: "ring",
text: "publishing"
};
const {PubSub} = require("@google-cloud/pubsub");
/**
* Extract JSON service account key from "google-cloud-credentials" config node.
*/
function GetCredentials(node) {
return JSON.parse(RED.nodes.getCredentials(node).account);
}
function GoogleCloudPubSubOutNode(config) {
let topic = null;
let topicReady = null; // A Promise that will be resolved when the topic is ready.
let pubsub = null;
RED.nodes.createNode(this, config);
const node = this;
let credentials = null;
if (config.account) {
credentials = GetCredentials(config.account);
}
const keyFilename = config.keyFilename;
if (!config.topic) {
node.error('No topic supplied!');
return;
}
node.status(STATUS_DISCONNECTED);
// Called to publish a new message.
async function OnInput(msg) {
if (msg == null || !msg.payload || msg.payload == "") {
return;
}
await topicReady;
node.status(STATUS_PUBLISHING);
try {
await topic.publish(RED.util.ensureBuffer(msg.payload));
node.status(STATUS_CONNECTED);
node.send(msg); // The message has been published so we can forward through the flow.
}
catch(e) {
node.status(STATUS_DISCONNECTED);
node.error(e);
}
} // OnInput
function OnClose() {
node.status(STATUS_DISCONNECTED);
pubsub = null;
} // OnClose
// We must have EITHER credentials or a keyFilename. If neither are supplied, that
// is an error. If both are supplied, then credentials will be used.
if (credentials) {
pubsub = new PubSub({
"credentials": credentials
});
} else if (keyFilename) {
pubsub = new PubSub({
"keyFilename": keyFilename
});
} else {
pubsub = new PubSub({});
}
node.status(STATUS_CONNECTING);
topicReady = new Promise((resolve, reject) => {
pubsub.topic(config.topic).get().then((data) => {
topic = data[0];
node.status(STATUS_CONNECTED);
resolve();
}).catch((reason) => {
node.status(STATUS_DISCONNECTED);
node.error(reason);
reject(reason);
});
}); // topicReady
node.on('close', OnClose);
node.on('input', OnInput);
} // GoogleCloudPubSubOutNode
RED.nodes.registerType("google-cloud-pubsub out", GoogleCloudPubSubOutNode);
};