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    1.0.3 • Public • Published


    The CouchEye tool can be used to monitor changes in one or more CouchDb databases and send notifications to topics in the Amazon Simple Notification Service (SNS). Multiple databases can be monitored by one running CouchEye instance and changes can be routed to multiple topics, which may even be in different regions or require diferrent credentials.

    To use CouchEye, simple install is using npm:

    npm install --save coucheye

    Below you'll find an example configuration using CoffeeScript syntax.

    Configuration options

    Key Description
    redis Object as returned by createClient in the redis package
    redisUrl URL of the Redis server; required unless redis option is given
    redisPrefix Sequence numbers for a feed are stored under #{redisPrefix}#{feedName}
    feeds A set of CouchDb feeds
    feeds.{name}.* Properties as accepted by the follow package
    endpoints A set of Amazon AWS endpoints, including credentials
    endpoints.{name}.* Properties as accepted by the aws-sdk package
    topics A set of SNS topics to which changes can be published
    topics.{name}.arn ARN of an SNS topic
    pipes A set of pipes that connect feeds, endpoints and topics
    pipes.{name}.feed Name of the feed to draw change from
    pipes.{name}.endpoint Name of the endpoint to send notifications to
    pipes.{name}.topic Name of the topic to send notifications to
    pipes.{name}.transformChange Function to transform a change object
    pipes.{name}.transformDoc Function to transform a change document; depends on feeds.<name>.include_docs options

    The pipes.<name>.transformChange and pipes.<name>.transformDoc options are not required, but are mutually exclusive. When either of those is used, the return value is used as content for the notification. If null or undefined is returned, not notification is published.

    Example configuration

    coucheye = (require 'coucheye')
        redisUrl: 'redis://username:password@redis.domain:9356/'
        redisPrefix: 'coucheye.'
                db: 'https://username:password@couchdb.domain/examples'
                include_docs: true
                db: 'https://username:password@couchdb.domain/extensions'
                include_docs: true
                accessKeyId: 'akid'
                secretAccessKey: 'secret'
                region: 'eu-west-1'
            exampleUpdated: 'arn:aws:sns:eu-west-1:123456789012:ExampleUpdated'
            exampleCompleted: 'arn:aws:sns:eu-west-1:123456789012:ExampleCompleted'
            extensionCreated: 'arn:aws:sns:eu-west-1:123456789012:ExtensionCreated'
            extensionApproved: 'arn:aws:sns:eu-west-1:123456789012:ExtensionApproved'
                feed: 'examples'
                endpoint: 'sns'
                topic: 'exampleUpdated'
                transformChange: (change) ->
                    # Ignore deletions
                    return null if change.deleted
                feed: 'examples'
                endpoint: 'sns'
                topic: 'exampleCompleted'
                transformDocument: (doc) ->
                    # Only notify for completed example
                    return null unless doc.status is 'COMPLETED'
                    exampleId: doc._id
                feed: 'extensions'
                endpoint: 'sns'
                topic: 'extensionCreated'
                transformDocument: (doc) ->
                    # First revision means document has just been created
                    return null unless doc._rev.match(/^1-/)?
                    extensionId: doc._id
                feed: 'extensions'
                endpoint: 'sns'
                topic: 'extensionApproved'
                transformDocument: (doc) ->
                    # Require an approval
                    return null unless doc.approval?
                    # But not an error
                    return null if doc.error?
                    extensionId: doc._id
    coucheye.on 'error', (err) ->
        console.err err
        process.exit 1




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