| /** |
| * Read changes feed from Cloudant database: |
| * https://docs.cloudant.com/database.html#get-changes |
| **/ |
| |
| function main(message) { |
| var cloudantOrError = getCloudantAccount(message); |
| if (typeof cloudantOrError !== 'object') { |
| return whisk.error('getCloudantAccount returned an unexpected object type.'); |
| } |
| var cloudant = cloudantOrError; |
| var dbName = message.dbname; |
| var params = {}; |
| |
| if(!dbName) { |
| return whisk.error('dbname is required.'); |
| } |
| |
| if (typeof message.params === 'object') { |
| params = message.params; |
| } else if (typeof message.params === 'string') { |
| try { |
| params = JSON.parse(message.params); |
| } catch (e) { |
| return whisk.error('params field cannot be parsed. Ensure it is valid JSON.'); |
| } |
| } |
| |
| return changes(cloudant, dbName, params); |
| } |
| |
| function changes(cloudant, dbName, params) { |
| return new Promise(function(resolve, reject) { |
| cloudant.db.changes(dbName, params, function(error, response) { |
| if (!error) { |
| console.log('success', response); |
| resolve(response); |
| } else { |
| console.error('error', error); |
| reject(error); |
| } |
| }); |
| }); |
| } |
| |
| function getCloudantAccount(message) { |
| // full cloudant URL - Cloudant NPM package has issues creating valid URLs |
| // when the username contains dashes (common in Bluemix scenarios) |
| var cloudantUrl; |
| |
| if (message.url) { |
| // use bluemix binding |
| cloudantUrl = message.url; |
| } else { |
| if (!message.host) { |
| whisk.error('cloudant account host is required.'); |
| return; |
| } |
| if (!message.username) { |
| whisk.error('cloudant account username is required.'); |
| return; |
| } |
| if (!message.password) { |
| whisk.error('cloudant account password is required.'); |
| return; |
| } |
| |
| cloudantUrl = "https://" + message.username + ":" + message.password + "@" + message.host; |
| } |
| |
| return require('cloudant')({ |
| url: cloudantUrl |
| }); |
| } |