Stub AzureBlob health+lifecycle rule updater

Author: lilith

src/Imageflow.Server.Storage.AzureBlob/Caching/HealthCheck.cs

@@ -0,0 +1,42 @@
+using Azure.Storage.Blobs;
+using Imazen.Abstractions.BlobCache;
+using Microsoft.Extensions.Logging;
+
+namespace Imageflow.Server.Storage.AzureBlob.Caching;
+
+internal record HealthCheck(IBlobCache Cache, NamedCacheConfiguration Config, ILogger Logger, Dictionary<BlobGroup, BlobServiceClient> ServiceClients, 
+    ContainerExistenceCache ContainerExists) 
+{
+    
+    // this.InitialCacheCapabilities = new BlobCacheCapabilities
+    // {
+    //     CanFetchMetadata = true,
+    //     CanFetchData = true,
+    //     CanConditionalFetch = false,
+    //     CanPut = true,
+    //     CanConditionalPut = false,
+    //     CanDelete = false,
+    //     CanSearchByTag = false,
+    //     CanPurgeByTag = false,
+    //     CanReceiveEvents = false,
+    //     SupportsHealthCheck = false,
+    //     SubscribesToRecentRequest = false,
+    //     SubscribesToExternalHits = true,
+    //     SubscribesToFreshResults = true,
+    //     RequiresInlineExecution = false,
+    //     FixedSize = false
+    // };
+    //
+
+    public ValueTask<IBlobCacheHealthDetails> CacheHealthCheck(CancellationToken cancellationToken = default)
+    {
+        
+    }
+    
+    internal record BasicHealthDetails(bool CanFetchData, bool CanFetchMetadata, bool CanConditionalFetch, bool CanPut, bool CanConditionalPut, bool CanSearchByTag, bool CanPurgeByTag);
+    
+    internal ValueTask<BasicHealthDetails> CheckGroup(BlobGroup group, CancellationToken cancellationToken = default)
+    {
+        
+    }
+}

src/Imageflow.Server.Storage.AzureBlob/Caching/LifecycleRuleUpdater.cs

@@ -0,0 +1,128 @@
+using Azure.Storage.Blobs;
+using Azure.Storage.Blobs.Models;
+using Imazen.Common.Concurrency;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Imazen.Abstractions.Logging;
+using Imazen.Abstractions.Resulting;
+
+namespace Imageflow.Server.Storage.AzureBlob.Caching
+{
+    internal class LifecycleRuleUpdater
+    {
+        private readonly NamedCacheConfiguration config;
+        private readonly IReLogger logger;
+        private readonly BlobServiceClient defaultClient;
+        private readonly BasicAsyncLock updateLock = new BasicAsyncLock();
+        private bool updateComplete = false;
+
+        public LifecycleRuleUpdater(NamedCacheConfiguration config, BlobServiceClient defaultClient, IReLogger logger)
+        {
+            this.config = config;
+            this.logger = logger.WithSubcategory(nameof(LifecycleRuleUpdater));
+            this.defaultClient = defaultClient;
+        }
+
+        internal async Task UpdateIfIncompleteAsync()
+        {
+            if (updateComplete) return;
+
+            using (await updateLock.LockAsync())
+            {
+                if (updateComplete) return;
+                await CreateContainersAsync();
+                await UpdateLifecycleRulesAsync();
+                await CreateAndReadTestFilesAsync(false);
+                updateComplete = true;
+            }
+        }
+
+        internal async Task CreateContainersAsync()
+        {
+            // Implementation similar to S3LifecycleUpdater's CreateBucketsAsync
+            // Use BlobServiceClient to create containers if they don't exist
+        }
+
+       internal async Task UpdateLifecycleRulesAsync()
+{
+    var client = defaultClient;
+    var lifecycleManagementPolicy = new BlobLifecycleManagementPolicy();
+    var rules = new List<BlobLifecycleRule>();
+
+    foreach (var groupConfig in config.BlobGroupConfigurations.Values)
+    {
+        if (groupConfig.UpdateLifecycleRules == false) continue;
+
+        var containerName = groupConfig.Location.ContainerName;
+        var prefix = groupConfig.Location.BlobPrefix;
+
+        if (groupConfig.Lifecycle.DaysBeforeExpiry.HasValue)
+        {
+            var rule = new BlobLifecycleRule
+            {
+                Name = $"Rule-{containerName}-{prefix}",
+                Enabled = true,
+                Definition = new BlobLifecycleRuleDefinition
+                {
+                    Filters = new BlobLifecycleRuleFilter
+                    {
+                        PrefixMatch = new List<string> { $"{containerName}/{prefix}" }
+                    },
+                    Actions = new BlobLifecycleRuleActions
+                    {
+                        BaseBlob = new BlobLifecycleRuleActionBase
+                        {
+                            Delete = new BlobLifecycleRuleActionDelete
+                            {
+                                DaysAfterModificationGreaterThan = groupConfig.Lifecycle.DaysBeforeExpiry.Value
+                            }
+                        }
+                    }
+                }
+            };
+
+            rules.Add(rule);
+        }
+    }
+
+    lifecycleManagementPolicy.Rules = rules;
+
+    try
+    {
+        await client.SetBlobLifecyclePolicyAsync(lifecycleManagementPolicy);
+        logger.LogInformation("Updated lifecycle rules for storage account");
+    }
+    catch (Exception e)
+    {
+        logger.LogError(e, $"Error updating lifecycle rules for storage account: {e.Message}");
+    }
+}
+
+        internal async Task<TestFilesResult> CreateAndReadTestFilesAsync(bool forceAll)
+        {
+            // Implementation similar to S3LifecycleUpdater's CreateAndReadTestFilesAsync
+            // Use BlobContainerClient to perform operations on blobs
+        }
+
+        private async Task<CodeResult> TryAzureOperationAsync(string containerName, string blobName, string operationName,
+            Func<Task> operation)
+        {
+            try
+            {
+                await operation();
+                return CodeResult.Ok();
+            }
+            catch (Azure.RequestFailedException e)
+            {
+                var err = CodeResult.FromException(e, $"Azure {operationName} {containerName} {blobName}");
+                logger.LogAsError(err);
+                return err;
+            }
+        }
+
+        internal record class TestFilesResult(List<CodeResult> Results, bool ReadsFailed, bool WritesFailed, bool ListFailed, bool DeleteFailed);
+    }
+}