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AzureTableGrainDirectory.cs
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AzureTableGrainDirectory.cs
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#nullable enable
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Web;
using Azure;
using Azure.Data.Tables;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Orleans.Configuration;
using Orleans.Runtime;
namespace Orleans.GrainDirectory.AzureStorage
{
public class AzureTableGrainDirectory : IGrainDirectory, ILifecycleParticipant<ISiloLifecycle>
{
private readonly AzureTableDataManager<GrainDirectoryEntity> tableDataManager;
private readonly string clusterId;
internal class GrainDirectoryEntity : ITableEntity
{
public required string SiloAddress { get; set; }
public required string ActivationId { get; set; }
public required long MembershipVersion { get; set; }
public required string PartitionKey { get; set; }
public required string RowKey { get; set; }
public DateTimeOffset? Timestamp { get; set; }
public ETag ETag { get; set; }
public GrainAddress ToGrainAddress()
{
return new GrainAddress
{
GrainId = RowKeyToGrainId(this.RowKey),
SiloAddress = Runtime.SiloAddress.FromParsableString(this.SiloAddress),
ActivationId = Runtime.ActivationId.FromParsableString(this.ActivationId),
MembershipVersion = new MembershipVersion(this.MembershipVersion)
};
}
public static GrainDirectoryEntity FromGrainAddress(string clusterId, GrainAddress address)
{
ArgumentNullException.ThrowIfNull(address.SiloAddress);
return new GrainDirectoryEntity
{
PartitionKey = clusterId,
RowKey = GrainIdToRowKey(address.GrainId),
SiloAddress = address.SiloAddress.ToParsableString(),
ActivationId = address.ActivationId.ToParsableString(),
MembershipVersion = address.MembershipVersion.Value,
};
}
internal static string GrainIdToRowKey(GrainId grainId) => HttpUtility.UrlEncode(grainId.ToString(), Encoding.UTF8);
internal static GrainId RowKeyToGrainId(string rowKey) => GrainId.Parse(HttpUtility.UrlDecode(rowKey, Encoding.UTF8));
}
public AzureTableGrainDirectory(
AzureTableGrainDirectoryOptions directoryOptions,
IOptions<ClusterOptions> clusterOptions,
ILoggerFactory loggerFactory)
{
this.tableDataManager = new AzureTableDataManager<GrainDirectoryEntity>(
directoryOptions,
loggerFactory.CreateLogger<AzureTableDataManager<GrainDirectoryEntity>>());
this.clusterId = clusterOptions.Value.ClusterId;
}
public async Task<GrainAddress?> Lookup(GrainId grainId)
{
var result = await this.tableDataManager.ReadSingleTableEntryAsync(this.clusterId, GrainDirectoryEntity.GrainIdToRowKey(grainId));
if (result.Entity is null)
{
return null;
}
return result.Item1.ToGrainAddress();
}
public Task<GrainAddress?> Register(GrainAddress address) => Register(address, null);
public async Task<GrainAddress?> Register(GrainAddress address, GrainAddress? previousAddress)
{
(bool isSuccess, string eTag) result;
if (previousAddress is not null)
{
var entry = GrainDirectoryEntity.FromGrainAddress(this.clusterId, address);
var previousEntry = GrainDirectoryEntity.FromGrainAddress(this.clusterId, previousAddress);
var (storedEntry, eTag) = await tableDataManager.ReadSingleTableEntryAsync(entry.PartitionKey, entry.RowKey);
if (storedEntry is null)
{
result = await this.tableDataManager.InsertTableEntryAsync(entry);
}
else if (storedEntry.ActivationId != previousEntry.ActivationId || storedEntry.SiloAddress != previousEntry.SiloAddress)
{
return await Lookup(address.GrainId);
}
else
{
_ = await tableDataManager.UpdateTableEntryAsync(entry, eTag);
return address;
}
}
else
{
var entry = GrainDirectoryEntity.FromGrainAddress(this.clusterId, address);
result = await this.tableDataManager.InsertTableEntryAsync(entry);
}
// Possible race condition?
return result.isSuccess ? address : await Lookup(address.GrainId);
}
public async Task Unregister(GrainAddress address)
{
var result = await this.tableDataManager.ReadSingleTableEntryAsync(this.clusterId, GrainDirectoryEntity.GrainIdToRowKey(address.GrainId));
// No entry found
if (result.Entity is null)
{
return;
}
// Check if the entry in storage match the one we were asked to delete
var entity = result.Item1;
if (entity.ActivationId == address.ActivationId.ToParsableString())
await this.tableDataManager.DeleteTableEntryAsync(GrainDirectoryEntity.FromGrainAddress(this.clusterId, address), entity.ETag.ToString());
}
public async Task UnregisterMany(List<GrainAddress> addresses)
{
if (addresses.Count <= this.tableDataManager.StoragePolicyOptions.MaxBulkUpdateRows)
{
await UnregisterManyBlock(addresses);
}
else
{
var tasks = new List<Task>();
foreach (var subList in addresses.BatchIEnumerable(this.tableDataManager.StoragePolicyOptions.MaxBulkUpdateRows))
{
tasks.Add(UnregisterManyBlock(subList));
}
await Task.WhenAll(tasks);
}
}
public Task UnregisterSilos(List<SiloAddress> siloAddresses)
{
// Too costly to implement using Azure Table
return Task.CompletedTask;
}
private async Task UnregisterManyBlock(List<GrainAddress> addresses)
{
var queryBuilder = new StringBuilder();
queryBuilder.Append(TableClient.CreateQueryFilter($"(PartitionKey eq {clusterId}) and ("));
var first = true;
foreach (var addr in addresses)
{
if (!first)
{
queryBuilder.Append(" or ");
}
else
{
first = false;
}
var rowKey = GrainDirectoryEntity.GrainIdToRowKey(addr.GrainId);
var queryClause = TableClient.CreateQueryFilter($"((RowKey eq {rowKey}) and (ActivationId eq {addr.ActivationId.ToString()}))");
queryBuilder.Append(queryClause);
}
queryBuilder.Append(')');
var entities = await this.tableDataManager.ReadTableEntriesAndEtagsAsync(queryBuilder.ToString());
await this.tableDataManager.DeleteTableEntriesAsync(entities);
}
// Called by lifecycle, should not be called explicitely, except for tests
public async Task InitializeIfNeeded(CancellationToken ct = default)
{
await this.tableDataManager.InitTableAsync();
}
public void Participate(ISiloLifecycle lifecycle)
{
lifecycle.Subscribe(nameof(AzureTableGrainDirectory), ServiceLifecycleStage.RuntimeInitialize, InitializeIfNeeded);
}
}
}