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prepare-for-slack.js
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prepare-for-slack.js
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/**
* Copyright 2016 IBM Corp. All Rights Reserved.
*
* 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
*
* https://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.
*/
/**
* @module notify
*/
const Cloudant = require('cloudant');
const self = exports;
/**
* Receives Cloudant change events and generates a message suitable for Slack
*
* @param {Object} args Expected arguments:
* <li> {string} doc - the Cloudant change event
* <li> {string} doc['services.cloudant.url'] - URL to the Cloudant service
* <li> {string} doc['services.cloudant.database'] - Database where recommendations are stored
* @returns {Object}
* <li> {string} text - a message to use in notifications
*/
function main(doc) {
if (!doc.deleted && doc.changes[0].rev.startsWith('1-')) {
// get the document from the db
return new Promise((resolve, reject) => {
self.makeMessage(
doc['services.cloudant.url'],
doc['services.cloudant.database'],
doc.id, (err, result) => {
if (err) {
console.log('[KO]', err);
reject({ error: err });
} else {
console.log('[OK] Text is', result.text);
resolve(result);
}
}
);
});
}
return { error: 'ignoring doc' };
}
exports.main = global.main = main;
/**
* Makes a message out of the recommendation
*
* <li> {string} cloudantUrl - URL to the Cloudant service
* <li> {string} cloudantDatabase - Database where recommendations are stored
* <li> {string} recommendationId
* <li> callback - err, document
*/
function makeMessage(cloudantUrl, cloudantDatabase, recommendationId, callback) {
console.log('Searching index for recommendation...', cloudantUrl, cloudantDatabase, recommendationId);
const cloudant = Cloudant({
url: cloudantUrl
});
const db = cloudant.db.use(cloudantDatabase);
db.get(recommendationId, (err, doc) => {
if (err) {
callback(err);
} else if (doc.recommendation) {
callback(null, { text: `${doc.recommendation.status} shipment from ${doc.recommendation.fromId} to ${doc.recommendation.toId}` });
} else {
callback('not a recommendation document');
}
});
}
exports.makeMessage = makeMessage;