snow2pubnub

This repo contains a quick-and-dirty implementation of a Service Now script include that is capable of inserting a message onto PubNub. It was originally created for a demo and not intended for production use.

PubNub

First, take a look at the PubNub API in question.

In particular, there's a very convenient GET method that can be used to place a message on the queue

https://ps.pndsn.com/publish/{pub_key}/{sub_key}/0/{channel}/0/{payload}{?uuid}

URI Parameters

pub_key

string (required) Example: myPubKey the publish key to use

sub_key

string (required) Example: mySubKey the subscriber key

channel

string (required) Example: ch1 the destination of the message

callback

string (required) Example: myCallback response will be wrapped in JSONP function, 0 for no JSONP

payload

string (required) Example: %7B%22text%22%3A%22hey%22%7D url-encoded JSON

uuid

string (required) Example: db9c5e39-7c95-40f5-8d71-125765b6f561 A unique alphanumeric ID for identifying the client.

Example

So the following:

curl https://ps.pndsn.com/publish/myPubKey/mySubKey/0/ch1/0/%7B%22text%22%3A%22hey%22%7D?uuid=db9c5e39-7c95-40f5-8d71-125765b6f561

Will cause this to show up in Pubnub:

{
  "text": "hey"
}

SNOW REST

Service Now has a facility for setting up REST endpoints. Create a new REST message called PubNub that has the following endpoint

https://ps.pndsn.com/publish/${pubkey}/${subkey}/0/${channel}/0/${encodedMsg}?uuid=${uuid}

Once created, in the HTTP Methods section, click on the Default GET. In the second set of tabs, there is a tab titled Variable Substitutions. For each of the variables in the URI (pubkey, subkey, channel, encodeMsg, and uuid), set the names and values accordingly based on what you did for the curl test earlier.

Between the two sets of tabs, there is a section titled Related Links. With the Variable Substitutions set, click on Test. When doing so, you should now see a new message show up on PubNub that matches whatever you set encodeMsg to.

Note Right now, I can't get the channel variable to set correctly so as a workaround you can hard code your channel name.

SNOW Business Rule

The contents of pubnub.js are derived from the SNOW provided Yahoo Finance example. Make a business rule out of it, filling in the appropriate var values as needed.

Note Right now, I'm unable to get Business Rules to fire correctly so the pubnub.js code has not yet been tested. Specifically, I'm a little worried about whether or not encodeURI is available.