link-index-updater: Optimize and add more logging

src/infra/docs-lambda-index-publisher/LinkIndexProvider.cs

@@ -19,6 +19,7 @@ public class LinkIndexProvider(IAmazonS3 s3Client, ILambdaLogger logger, string
 {
 	private string? _etag;
 	private LinkReferenceRegistry? _linkIndex;
+	private bool _modified;
 
 	private async Task<LinkReferenceRegistry> GetLinkIndex()
 	{
@@ -56,12 +57,18 @@ public async Task UpdateLinkIndexEntry(LinkRegistryEntry linkRegistryEntry)
 			{
 				{ linkRegistryEntry.Branch, linkRegistryEntry }
 			});
+			_modified = true;
 			logger.LogInformation("Added new entry for {repository}@{branch}", linkRegistryEntry.Repository, linkRegistryEntry.Branch);
 		}
 	}
 
 	public async Task Save()
 	{
+		if (!_modified)
+		{
+			logger.LogInformation("Skipping Save() because the link index was not modified");
+			return;
+		}
 		if (_etag == null || _linkIndex == null)
 			throw new InvalidOperationException("You must call UpdateLinkIndexEntry() before Save()");
 		var json = LinkReferenceRegistry.Serialize(_linkIndex);

src/infra/docs-lambda-index-publisher/Program.cs

@@ -3,13 +3,13 @@
 // See the LICENSE file in the project root for more information
 
 using System.Collections.Concurrent;
+using System.Text.Json;
 using Amazon.Lambda.Core;
 using Amazon.Lambda.RuntimeSupport;
 using Amazon.Lambda.Serialization.SystemTextJson;
 using Amazon.Lambda.SQSEvents;
 using Amazon.S3;
 using Amazon.S3.Util;
-using Elastic.Documentation;
 using Elastic.Documentation.Lambda.LinkIndexUploader;
 using Elastic.Documentation.Links;
 
@@ -30,6 +30,8 @@ static async Task<SQSBatchResponse> Handler(SQSEvent ev, ILambdaContext context)
 	var batchItemFailures = new List<SQSBatchResponse.BatchItemFailure>();
 	foreach (var message in ev.Records)
 	{
+		context.Logger.LogInformation("Processing message {MessageId}", message.MessageId);
+		context.Logger.LogInformation("Message body: {MessageBody}", message.Body);
 		try
 		{
 			var s3RecordLinkReferenceTuples = await GetS3RecordLinkReferenceTuples(s3Client, message, context);
@@ -55,6 +57,8 @@ static async Task<SQSBatchResponse> Handler(SQSEvent ev, ILambdaContext context)
 		var response = new SQSBatchResponse(batchItemFailures);
 		if (batchItemFailures.Count > 0)
 			context.Logger.LogInformation("Failed to process {batchItemFailuresCount} of {allMessagesCount} messages. Returning them to the queue.", batchItemFailures.Count, ev.Records.Count);
+		var jsonStr = JsonSerializer.Serialize(response, SerializerContext.Default.SQSBatchResponse);
+		context.Logger.LogInformation(jsonStr);
 		return response;
 	}
 	catch (Exception ex)
@@ -67,6 +71,8 @@ static async Task<SQSBatchResponse> Handler(SQSEvent ev, ILambdaContext context)
 		{
 			ItemIdentifier = r.MessageId
 		}).ToList());
+		var jsonStr = JsonSerializer.Serialize(response, SerializerContext.Default.SQSBatchResponse);
+		context.Logger.LogInformation(jsonStr);
 		return response;
 	}
 }