event-processor-host

Usage

This library is primarily event-based with promises for starting/stopping (for now, using Bluebird). See tests/event_processor_host_test.js for a basic example.

The simplest usage is to instantiate the main EventProcessorHost class with a storage details and an EventHubClient, or use the static factory method EventProcessorHost.fromConnectionString(name, consumerGroup, storageConnectionString, eventHubConnectionString, eventHubPath). Once you have a host, you call attach event handlers to the exposed events (EventProcessorHost.Opened, .Closed, .Message) and then start with an optional partition filter and wait for it to start up. The optional filter allows you to only receive from certain partitions, which in the case of very large event hubs could be useful (e.g. for a 1024-partition hub, you could receive from 128 partitions on each of 8 host groups).

Example - Basic life-cycle, listening on all partitions.

var Promise = require('bluebird');
var EventProcessorHost = require('event-processor-host').EventProcessorHost;

var ephost = EventProcessorHost.fromConnectionString('eph', '$Default', 'DefaultEndpointsProtocol=https;AccountName=name;AccountKey=key', 'Endpoint=sb://my-servicebus-namespace.servicebus.windows.net/;SharedAccessKeyName=my-SA-name;SharedAccessKey=my-SA-key', 'myeventhub');
ephost.on(EventProcessorHost.Message, function (context, message) {
    console.log('Receved a message on partition ' + context.partitionId);
    console.log(message);
});
ephost.start().then(function() {
    return Promise.delay(1000);
}).then(function() {
    return ephost.stop();
});