#Openwhisk RSS Package

This package allows users to subscribe to RSS/ATOM feeds and receive events when a new feed item is available. It creates one event/activation per feed item that meets the criteria.

openwhisk-package-rss/
├── actions
│   └── app.js
├── CONTRIBUTING.md
|-- images 
├── feeds
│      └── feed.js
├── install.sh
├── LICENSE.txt
├── README.md
├── tests
│   └── src
│      └── RssTests.scala
├── tools
│   └── travis
│       └── build.sh
├── rssEventProvider
│      └── app.js
|	   |__ manifest.yml
|	   |__ package.json
└── uninstall.sh

##Architecture

##Usage To use this trigger feed, you need to pass the required parameters (refer to the table below)

wsk trigger create rss_trigger --feed /namespace/package/feed_name -p url 'url_to_rss' -p pollingInterval 'timePeriod'

e.g.
wsk trigger create rss_trigger --feed /guest/rss/rss_feed -p url 'http://rss.nytimes.com/services/xml/rss/nyt/HomePage.xml' -p pollingInterval '2h'

Accepted polling interval formats: 2 days, 1d, 10h, 2.5hrs, 2h, 1m, 5s

Install wsk CLI

Follow the instructions at https://new-console.ng.bluemix.net/openwhisk/cli

Initializing database:

Create a CouchDB/Cloudant instance called ow_triggers and the following database:

• registered_triggers

This database will hold all of the registered triggers with the RSS sources. A potential database service that could be used is the Bluemix Cloudant service.

RSS Service(Event Provider)

In order to support the openwhisk package, there needs to be an event generating service that fires a trigger in the openwhisk environment. This service polls an RSS/ATOM source and applies logic to determine whether a feed item should be delivered to the openwhisk rss package. It internally uses a CouchDB database to persist the triggers' information. You will need to initialized the DB prior to using this service. The event provider service keeps a registry of triggers. When a trigger is initially created, the service fires events for RSS feed items which are published within pollingInterval from now.

There are two options to deploy the service:

Bluemix Deployment:

This service can be hosted as a cf app on CloudFoundry. To deploy on IBM Bluemix:

1. Change the name and host fields in the manifest.yml to be unique. Bluemix requires routes to be globally unique.
2. Run cf push

Local Deployment:

This service can be ran as a node app on your local machine. To run it use the following command:

node app.js CLOUDANT_USERNAME CLOUDANT_PASSWORD OPENWHISK_AUTH_KEY

Note: Local deployment of this service requires extra configuration if it's to be run with the Bluemix OpenWhisk.

RSS Package Installation

Bluemix Installation

./install.sh openwhisk.ng.bluemix.net $AUTH_KEY wsk $PROVIDER_ENDPOINT

./uninstall.sh openwhisk.ng.bluemix.net $AUTH_KEY wsk

where:

• $PROVIDER_ENDPOINT is the endpoint of the event provider service. It's a fully qualified url including the path to the resource. i.e. http://host:port/rss
• $AUTH_KEY is the OpenWhisk Authentication key(Run wsk property get to obtain it).

Local installation:

Local installation requires running the OpenWhisk environment locally prior to installing the package. To run OpenWhisk locally follow the instructions at https://github.com/openwhisk/openwhisk/blob/master/tools/vagrant/README.md.

./install.sh $EDGE_HOST $AUTH_KEY $WSK_CLI $PROVIDER_ENDPOINT

./uninstall.sh $EDGE_HOST $AUTH_KEY $WSK_CLI

where :

• $EDGE_HOST is where openwhisk is deployed
• $AUTH_KEY is the OpenWhisk Authentication key(Run wsk property get to obtain it).
• $WSK_CLI is the path of OpenWhisk command interface binary
• $PROVIDER_ENDPOINT is the endpoint of the event provider service. It's a fully qualified url including the path to the resource. i.e. http://host:port/rss

This will create a new package called rss as well as feed action within the package.

##Package contents

Entity	Type	Parameters	Description
/namespace/rss	package	-	Openwhisk Package Template
/namespace/rss/rss_feed.js	feed	details	Feed to provide events when a new rss item is available

###Feeds

Parameter	Type	Required	Description	Options	Default	Example
url	string	yes	Url to RSS feed	-	-	"http://rss.nytimes.com/services/xml/rss/nyt/HomePage.xml"
pollingInterval	string	yes	Interval at which polling is performed	-	-	"2h"
filter	string	no	Comma separted list of keywords to filter on	-	-	"Washington D.C.,capital"

Note: If the filter parameter enables logic that only searches for matches in the feed items' titles and descriptions. If 60% or more of the keywords are found in the RSS feed item, an event will be fired for the feed item. For example, given that filter "Washington D.C.,capital,politics", an event will be fired only if 2 of the 3 keywords are present in the feed item.

##Testing Executing test case locally:

1. Copy your test files into openwhisk/tests/src/packages
2. vagrant ssh to your local vagrant environment
3. Navigate to the openwhisk directory
4. Run this command - gradle :tests:test --tests "packages.CLASS_NAME

To execute all tests, run gradle :tests:test

Contributing

Please refer to CONTRIBUTING.md

License

Copyright 2015-2016 IBM Corporation

Licensed under the Apache License, Version 2.0 (the "License").

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.