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LiteDBPersistence.cs
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LiteDBPersistence.cs
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using LiteDB;
using NStore.Core.Logging;
using NStore.Core.Persistence;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
namespace NStore.Persistence.LiteDB
{
/// <summary>
/// LiteDB Persistence Provider
/// </summary>
public class LiteDBPersistence : IPersistence, IDisposable
{
private readonly LiteDBPersistenceOptions _options;
private LiteDatabase _db;
private ILiteCollection<LiteDBChunk> _streams;
private readonly INStoreLogger _logger;
public LiteDBPersistence(LiteDBPersistenceOptions options)
{
_options = options;
_logger = _options.LoggerFactory.CreateLogger(_options.ConnectionString);
_logger.LogInformation("LiteDB Persistence on {file}", _options.ConnectionString);
}
public bool SupportsFillers => false;
public async Task ReadForwardAsync
(
string partitionId,
long fromLowerIndexInclusive,
ISubscription subscription,
long toUpperIndexInclusive,
int limit,
CancellationToken cancellationToken)
{
var chunks = _streams.Query()
.Where(x => x.PartitionId == partitionId
&& x.Index >= fromLowerIndexInclusive
&& x.Index <= toUpperIndexInclusive)
.OrderBy(x => x.Index)
.Limit(limit)
.ToList();
await PublishAsync(chunks, fromLowerIndexInclusive, subscription, false, cancellationToken)
.ConfigureAwait(false);
}
public async Task ReadForwardMultiplePartitionsByGlobalPositionAsync(
IEnumerable<string> partitionIdsList,
long fromLowerPositionInclusive,
ISubscription subscription,
long toUpperPositionInclusive,
CancellationToken cancellationToken)
{
var chunks = _streams.Query()
.Where(x => partitionIdsList.Contains(x.PartitionId)
&& x.Position >= fromLowerPositionInclusive
&& x.Position <= toUpperPositionInclusive)
.OrderBy(x => x.Position)
.ToList();
await PublishAsync(chunks, fromLowerPositionInclusive, subscription, false, cancellationToken)
.ConfigureAwait(false);
}
private async Task PublishAsync(
IEnumerable<LiteDBChunk> chunks,
long start,
ISubscription subscription,
bool broadcastPosition,
CancellationToken cancellationToken)
{
await subscription.OnStartAsync(start).ConfigureAwait(false);
long positionOrIndex = 0;
try
{
foreach (var chunk in chunks)
{
cancellationToken.ThrowIfCancellationRequested();
positionOrIndex = broadcastPosition ? chunk.Position : chunk.Index;
if (chunk.Payload != null)
{
chunk.Payload = _options.PayloadSerializer.Deserialize((string)chunk.Payload);
}
var ok = await subscription.OnNextAsync(chunk).ConfigureAwait(false);
if (!ok)
{
await subscription.StoppedAsync(positionOrIndex).ConfigureAwait(false);
return;
}
}
}
catch (TaskCanceledException ex)
{
_logger.LogWarning($"PushToSubscriber: {ex.Message}.\n{ex.StackTrace}");
await subscription.StoppedAsync(positionOrIndex).ConfigureAwait(false);
}
catch (Exception e)
{
_logger.LogError($"Error During PushToSubscriber: {e.Message}.\n{e.StackTrace}");
await subscription.OnErrorAsync(positionOrIndex, e).ConfigureAwait(false);
}
await subscription.CompletedAsync(positionOrIndex).ConfigureAwait(false);
}
public async Task ReadBackwardAsync(
string partitionId,
long fromUpperIndexInclusive,
ISubscription subscription,
long toLowerIndexInclusive,
int limit,
CancellationToken cancellationToken)
{
var chunks = _streams.Query()
.Where(x => x.PartitionId == partitionId && x.Index >= toLowerIndexInclusive &&
x.Index <= fromUpperIndexInclusive)
.OrderByDescending(x => x.Index)
.Limit(limit)
.ToEnumerable();
await PublishAsync(chunks, fromUpperIndexInclusive, subscription, false, cancellationToken)
.ConfigureAwait(false);
}
public Task<IChunk> ReadSingleBackwardAsync
(
string partitionId,
long fromUpperIndexInclusive,
CancellationToken cancellationToken)
{
var chunk = _streams.Query()
.Where(x => x.PartitionId == partitionId && x.Index <= fromUpperIndexInclusive)
.OrderByDescending(x => x.Index)
.Limit(1)
.FirstOrDefault();
if (chunk?.Payload != null)
{
chunk.Payload = _options.PayloadSerializer.Deserialize((string)chunk.Payload);
}
return Task.FromResult((IChunk)chunk);
}
public Task<IChunk> AppendAsync(
string partitionId,
long index,
object payload,
string operationId,
CancellationToken cancellationToken)
{
if (index < 0)
{
throw new InvalidStreamIndexException(partitionId, index);
}
var chunk = new LiteDBChunk()
{
PartitionId = partitionId,
Index = index,
OperationId = operationId ?? Guid.NewGuid().ToString(),
Payload = _options.PayloadSerializer.Serialize(payload)
};
chunk.StreamSequence = $"{chunk.PartitionId}-{chunk.Index}";
chunk.StreamOperation = $"{chunk.PartitionId}-{chunk.OperationId}";
try
{
_streams.Insert(chunk);
return Task.FromResult((IChunk)chunk);
}
catch (LiteException ex)
{
if (ex.ErrorCode != LiteException.INDEX_DUPLICATE_KEY)
{
throw;
}
if (ex.Message.Contains(nameof(chunk.StreamOperation)))
{
return Task.FromResult((IChunk)null);
}
if (ex.Message.Contains(nameof(chunk.StreamSequence)))
{
throw new DuplicateStreamIndexException(chunk.PartitionId, chunk.Index);
}
throw;
}
}
public Task<IChunk> ReplaceOneAsync
(
long position,
string partitionId,
long index,
object payload,
string operationId,
CancellationToken cancellationToken)
{
var chunk = new LiteDBChunk()
{
Position = position,
PartitionId = partitionId,
Index = index,
OperationId = operationId ?? Guid.NewGuid().ToString(),
Payload = _options.PayloadSerializer.Serialize(payload)
};
chunk.StreamSequence = $"{chunk.PartitionId}-{chunk.Index}";
chunk.StreamOperation = $"{chunk.PartitionId}-{chunk.OperationId}";
try
{
var updated = _streams.Update(chunk);
if (!updated)
{
throw new Exception("Cannot rewrite chunk");
}
return Task.FromResult<IChunk>(chunk);
}
catch (LiteException ex)
{
if (ex.ErrorCode != LiteException.INDEX_DUPLICATE_KEY)
{
throw;
}
if (ex.Message.Contains(nameof(chunk.StreamOperation)))
{
return Task.FromResult((IChunk)null);
}
if (ex.Message.Contains(nameof(chunk.StreamSequence)))
{
throw new DuplicateStreamIndexException(chunk.PartitionId, chunk.Index);
}
throw;
}
}
public Task DeleteAsync(
string partitionId,
long fromLowerIndexInclusive,
long toUpperIndexInclusive,
CancellationToken cancellationToken)
{
_streams.DeleteMany(x =>
x.PartitionId == partitionId
&& x.Index >= fromLowerIndexInclusive
&& x.Index <= toUpperIndexInclusive
);
return Task.CompletedTask;
}
public Task<IChunk> ReadByOperationIdAsync(
string partitionId,
string operationId,
CancellationToken cancellationToken)
{
var key = $"{partitionId}-{operationId}";
var chunk = _streams.Query().Where(x => x.StreamOperation == key).FirstOrDefault();
if (chunk?.Payload != null)
{
chunk.Payload = _options.PayloadSerializer.Deserialize((string)chunk.Payload);
}
return Task.FromResult<IChunk>(chunk);
}
public Task<IChunk> ReadOneAsync(long position, CancellationToken cancellationToken)
{
var chunk = _streams.Query().Where(x => x.Position == position).FirstOrDefault();
if (chunk?.Payload != null)
{
chunk.Payload = _options.PayloadSerializer.Deserialize((string)chunk.Payload);
}
return Task.FromResult<IChunk>(chunk);
}
public async Task ReadAllAsync
(
long fromPositionInclusive,
ISubscription subscription,
int limit,
CancellationToken cancellationToken)
{
var chunks = _streams.Query()
.Where(x => x.Position >= fromPositionInclusive)
.Limit(limit)
.ToEnumerable();
await PublishAsync(chunks, fromPositionInclusive, subscription, true, cancellationToken)
.ConfigureAwait(false);
}
public Task<long> ReadLastPositionAsync(CancellationToken cancellationToken)
{
var lastPosition = _streams.Query()
.OrderByDescending(x => x.Position)
.Select(x => x.Position)
.FirstOrDefault();
return Task.FromResult(lastPosition);
}
public async Task ReadAllByOperationIdAsync(string operationId, ISubscription subscription,
CancellationToken cancellationToken)
{
var chunks = _streams.Query()
.Where(x => x.OperationId == operationId)
.OrderBy(x => x.Position)
.ToEnumerable();
await PublishAsync(chunks, 0, subscription, true, cancellationToken).ConfigureAwait(false);
}
public void Init()
{
_db = new LiteDatabase(_options.ConnectionString, _options.Mapper);
_streams = _db.GetCollection<LiteDBChunk>(_options.StreamsCollectionName);
_streams.EnsureIndex(x => x.StreamSequence, true);
_streams.EnsureIndex(x => x.StreamOperation, true);
}
public void DeleteDataFiles()
{
if (_db != null)
{
_streams = null;
_db.Dispose();
}
// data file
if (File.Exists(_options.ConnectionString))
{
File.Delete(_options.ConnectionString);
}
// log file
var logFileName = Path.Combine
(
Path.GetDirectoryName(_options.ConnectionString),
Path.ChangeExtension
(
Path.GetFileNameWithoutExtension(_options.ConnectionString) + "-log",
Path.GetExtension(_options.ConnectionString)
)
);
if (File.Exists(logFileName))
{
File.Delete(logFileName);
}
}
public void Dispose()
{
_db.Dispose();
}
}
}