Simple Autocomplete Service

A Node.js app that uses an attached Redis database to provide an autocomplete API for data uploaded as text files. Multiple separate autocomplete indexes are supported.

The autocomplete API is CORS-enabled, so that it can be accessed from any web page and conforms to the jQuery autocomplete standard.

Running the app on Bluemix

The fastest way to deploy this application to Bluemix is to click the Deploy to Bluemix button below.

Don't have a Bluemix account? If you haven't already, you'll be prompted to sign up for a Bluemix account when you click the button. Sign up, verify your email address, then return here and click the the Deploy to Bluemix button again. Your new credentials let you deploy to the platform and also to code online with Bluemix and Git. If you have questions about working in Bluemix, find answers in the Bluemix Docs.

Running the app locally

Clone this repository then run npm install to add the Node.js libraries required to run the app.

You will also need to have access to a Redis server (either running locally, or elsewhere).

You will then need to set some environemt variables to tell the Simple Autocomplete Service how to connect to your Redis server:

export SAS_REDIS_HOST='localhost/6379' - This is required, but does not have to be localhost
export SAS_REDIS_USERNAME='redis_username' - This is not required, depends on your Redis server
export SAS_REDIS_PASSWORD='redis_password' - This is not required, depends on your Redis server

Then run:

node app.js

Service Registry

The Service Registry allows the Simple Autocomplete Service to be utilised by the Simple Search Service to implement autocompletes from within the Search Service UI. This is achieved by using the Simple Service Registry module.

Enabling the Service Registry

Enabling the Service Registry requires setting an environment variable, ETCD_URL. This should be the URL of your Etcd instance including any basic HTTP authentication information

export ETCD_URL='http://username:password@etcd.exmple.com'

If the Service Registry is enabled, the Simple Autocomplete Service will become discoverable by the Simple Search Service.

API

GET /api

Returns a JSON array of autocomplete indexes that are available

e.g.

[]

or

["animals","trees","actors"]

GET /api/:name?term=

Parameters

term - the search term to autocomplete

Returns a JSON array of possible autocompletions

e.g.

["Pedro","Pejman Montazeri","Pepe Reina","Pepe","Per Mertesacker","Peter Odemwingie"]

POST /api/:name

Parameters, one of:

file - the text file containing a list of items to be added to the auto-complete index
or, url - the url of the file containing a list of items to be added to the auto-complete index

N.B the form type needs to be enctype="multipart/form-data"

DELETE /api/:name

Delete the named autocomplete index.

Lockdown mode

If you have uploaded your content into the Simple Autocomplete Service but now want only the GET /api/:name endpoint to continue working, then you can enable "Lockdown mode".

Simply set an environment variable called LOCKDOWN to true before running the Simple Autocomplete Service:

export LOCKDOWN=true
node app.js

or set a custom environment variable in Bluemix.

This prevents your data being modified until lockdown mode is switched off again, by removing the environment variable.

If you wish to edit your data, but do not want to disable lockdown mode, you can set two more environment variables:

SAS_LOCKDOWN_USERNAME
SAS_LOCKDOWN_PASSWORD

When these are set, you will be able to access the UI and the API by providing a matching username and password. If you are accessing the UI via your browser, you will be prompted to enter the username and password, if you are accessing the API, you can provide these details as part of your request:

curl -X GET http://<yourdomain>/api --user <username>:<password>

ibm-watson-data-lab/simple-autocomplete-service

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