public async Task AddSnapshotAsync(IAggregateSnapshot <TKey> snapshot, CancellationToken cancellationToken = default)
{
if (snapshot is null)
{
throw new System.ArgumentNullException(nameof(snapshot));
}
string json = JsonConvert.SerializeObject(snapshot, Defaults.JsonSerializerSettings);
S3SnapshotStoreOptions options = _monitor.AggregateOptions;
var request = new PutObjectRequest
{
BucketName = options.BucketName,
Key = $"{options.Prefix}/{snapshot.AggregateId}/{snapshot.AggregateVersion}.json",
ContentBody = json
};
await _client.PutObjectAsync(request, cancellationToken).ConfigureAwait(false);
}
public async Task <IAggregateSnapshot <TKey> > FindLastSnapshotAsync(TKey aggregateId, int maxVersion, CancellationToken cancellationToken = default)
{
S3SnapshotStoreOptions options = _monitor.AggregateOptions;
string prefix = $"{options.Prefix}/{aggregateId}/";
ListObjectsV2Response response = await _client.ListObjectsV2Async(new ListObjectsV2Request
{
BucketName = options.BucketName,
Prefix = prefix
});
var objects = response.S3Objects
.Select(x => x.Key)
.Select(x => new { Key = x, FileName = x.Substring(prefix.Length).Split('.').First() })
.Where(x => int.TryParse(x.FileName, out int _))
.Select(x => new { x.Key, Version = int.Parse(x.FileName) })
.Where(x => x.Version <= maxVersion)
.OrderByDescending(x => x.Version)
.ToList();
if (objects.Count == 0)
{
return(null);
}
string json;
var request2 = new GetObjectRequest
{
BucketName = options.BucketName,
Key = objects.First().Key
};
using (GetObjectResponse response2 = await _client.GetObjectAsync(request2))
using (Stream responseStream = response2.ResponseStream)
using (var reader = new StreamReader(responseStream))
{
json = reader.ReadToEnd(); // Now you process the response body.
}
IAggregateSnapshot <TKey> snapshot = JsonConvert.DeserializeObject <IAggregateSnapshot <TKey> >(json, Defaults.JsonSerializerSettings);
return(snapshot);
}