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@dbarkol
Created October 25, 2022 22:24
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Azure.Messaging.ServiceBus;
using Microsoft.Azure.Cosmos;
using Microsoft.Azure.Documents;
using Microsoft.Azure.Documents.Client;
using Microsoft.Azure.Documents.Linq;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Host;
using Microsoft.Azure.WebJobs.ServiceBus;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using OutboxProcessor.Models;
namespace OutboxProcessor
{
public static class OrderOutboxWorker
{
[FunctionName("OrderOutboxWorker")]
public static async Task Run(
[CosmosDBTrigger(
databaseName: "%CosmosDBDatabaseName%",
collectionName: "%CosmosDBCollectionName%",
ConnectionStringSetting = "CosmosDBConnectionString",
CreateLeaseCollectionIfNotExists = true,
LeaseCollectionName = "%CosmosDBLeaseCollectionName%")] IReadOnlyList<Document> input,
[CosmosDB(
databaseName: "%CosmosDBDatabaseName%",
collectionName: "%CosmosDBCollectionName%",
ConnectionStringSetting = "CosmosDBConnectionString",
SqlQuery = "select * from Orders r where r.orderProcessed = false")] IEnumerable<Document> ordersCreated,
[CosmosDB(
databaseName: "%CosmosDBDatabaseName%",
collectionName: "%CosmosDBCollectionName%",
ConnectionStringSetting = "CosmosDBConnectionString"
)] DocumentClient client,
[ServiceBus(
"%TopicName%",
Connection = "ServiceBusConnectionString",
EntityType = ServiceBusEntityType.Topic
)] IAsyncCollector<ServiceBusMessage> ordersToProcess,
ILogger log)
{
// This function is triggered off the change feed in CosmosDB. When
// new items are added to the orders container, it will be invoked
// so that the outbox transaction can be completed.
if (input != null && input.Count > 0)
{
log.LogInformation("Documents modified " + input.Count);
log.LogInformation("First document Id " + input[0].Id);
// Iterate throught the collection of orders that are ready to be processed
foreach (var o in ordersCreated)
{
// Deserialize the document into an order object so that the
// Order ID can be referenced when setting message properties
var order = JsonConvert.DeserializeObject<Order>(o.ToString());
// Create a service bus message with the order object
var jsonBody = JsonConvert.SerializeObject(order);
var byteArray = Encoding.UTF8.GetBytes(jsonBody);
var msg = new ServiceBusMessage(byteArray);
// Set the message ID to the order ID
msg.MessageId = order.OrderId.ToString();
msg.ContentType = "application/json";
msg.ApplicationProperties.Add("MessageType", "OrderCreatedEvent");
// Publish the message
await ordersToProcess.AddAsync(msg);
// Update the order processed flag in the container to complete
// the outbox transaction
o.SetPropertyValue("orderProcessed", true);
await client.ReplaceDocumentAsync(o.SelfLink, o);
}
}
}
}
}
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