Queries finalized.

src/Squidex.Infrastructure.Azure/EventSourcing/CosmosDbEvent.cs

@@ -11,13 +11,13 @@ namespace Squidex.Infrastructure.EventSourcing
 {
     internal sealed class CosmosDbEvent
     {
-        [JsonProperty]
+        [JsonProperty("type")]
         public string Type { get; set; }
 
-        [JsonProperty]
+        [JsonProperty("payload")]
         public string Payload { get; set; }
 
-        [JsonProperty]
+        [JsonProperty("header")]
         public EnvelopeHeaders Headers { get; set; }
 
         public static CosmosDbEvent FromEventData(EventData data)

src/Squidex.Infrastructure.Azure/EventSourcing/CosmosDbEventCommit.cs

@@ -12,22 +12,22 @@ namespace Squidex.Infrastructure.EventSourcing
 {
     internal sealed class CosmosDbEventCommit
     {
-        [JsonProperty]
+        [JsonProperty("id")]
         public Guid Id { get; set; }
 
-        [JsonProperty]
+        [JsonProperty("events")]
         public CosmosDbEvent[] Events { get; set; }
 
-        [JsonProperty]
+        [JsonProperty("eventStreamOffset")]
         public long EventStreamOffset { get; set; }
 
-        [JsonProperty]
+        [JsonProperty("eventsCount")]
         public long EventsCount { get; set; }
 
-        [JsonProperty]
+        [JsonProperty("eventStream")]
         public string EventStream { get; set; }
 
-        [JsonProperty]
+        [JsonProperty("timestamp")]
         public long Timestamp { get; set; }
     }
 }

src/Squidex.Infrastructure.Azure/EventSourcing/CosmosDbEventStore.cs

@@ -19,7 +19,8 @@ namespace Squidex.Infrastructure.EventSourcing
         private readonly DocumentClient documentClient;
         private readonly Uri databaseUri;
         private readonly Uri collectionUri;
-        private readonly string database;
+        private readonly string databaseId;
+        private readonly string collectionId;
 
         public CosmosDbEventStore(DocumentClient documentClient, string database)
         {
@@ -28,15 +29,16 @@ namespace Squidex.Infrastructure.EventSourcing
 
             this.documentClient = documentClient;
 
-            this.databaseUri = UriFactory.CreateDatabaseUri(database);
-            this.database = database;
+            databaseUri = UriFactory.CreateDatabaseUri(database);
+            databaseId = database;
 
             collectionUri = UriFactory.CreateDocumentCollectionUri(database, FilterBuilder.Collection);
+            collectionId = FilterBuilder.Collection;
         }
 
         public async Task InitializeAsync(CancellationToken ct = default)
         {
-            await documentClient.CreateDatabaseIfNotExistsAsync(new Database { Id = database });
+            await documentClient.CreateDatabaseIfNotExistsAsync(new Database { Id = databaseId });
 
             await documentClient.CreateDocumentCollectionIfNotExistsAsync(databaseUri,
                 new DocumentCollection

src/Squidex.Infrastructure.Azure/EventSourcing/CosmosDbEventStore_Reader.cs

@@ -7,11 +7,11 @@
 
 using System;
 using System.Collections.Generic;
-using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
-using Microsoft.Azure.Documents.Linq;
+using Microsoft.Azure.Documents;
 using Squidex.Infrastructure.Log;
+using Squidex.Infrastructure.Tasks;
 
 namespace Squidex.Infrastructure.EventSourcing
 {
@@ -24,7 +24,7 @@ namespace Squidex.Infrastructure.EventSourcing
             Guard.NotNull(subscriber, nameof(subscriber));
             Guard.NotNullOrEmpty(streamFilter, nameof(streamFilter));
 
-            return new PollingSubscription(this, subscriber, streamFilter, position);
+            throw new NotSupportedException();
         }
 
         public Task CreateIndexAsync(string property)
@@ -36,19 +36,11 @@ namespace Squidex.Infrastructure.EventSourcing
         {
             using (Profiler.TraceMethod<CosmosDbEventStore>())
             {
-                var query =
-                    documentClient.CreateDocumentQuery<CosmosDbEventCommit>(collectionUri,
-                        FilterBuilder.ByStreamName(streamName, streamPosition));
-
-                var documentQuery = query.AsDocumentQuery();
+                var query = FilterBuilder.ByStreamName(streamName, streamPosition - MaxCommitSize);
 
                 var result = new List<StoredEvent>();
 
-                while (documentQuery.HasMoreResults)
-                {
-                    var commits = await documentQuery.ExecuteNextAsync<CosmosDbEventCommit>();
-
-                    foreach (var commit in commits)
+                await documentClient.QueryAsync(collectionUri, query, commit =>
                 {
                     var eventStreamOffset = (int)commit.EventStreamOffset;
 
@@ -67,8 +59,9 @@ namespace Squidex.Infrastructure.EventSourcing
                             result.Add(new StoredEvent(streamName, eventToken, eventStreamOffset, eventData));
                         }
                     }
-                    }
-                }
+
+                    return TaskHelper.Done;
+                });
 
                 return result;
             }
@@ -80,8 +73,8 @@ namespace Squidex.Infrastructure.EventSourcing
 
             StreamPosition lastPosition = position;
 
-            var filterDefinition = CreateFilter(property, value, lastPosition);
-            var filterExpression = CreateFilterExpression(property, value);
+            var filterDefinition = FilterBuilder.CreateByProperty(property, value, lastPosition);
+            var filterExpression = FilterBuilder.CreateExpression(property, value);
 
             return QueryAsync(callback, lastPosition, filterDefinition, filterExpression, ct);
         }
@@ -92,23 +85,17 @@ namespace Squidex.Infrastructure.EventSourcing
 
             StreamPosition lastPosition = position;
 
-            var filterDefinition = CreateFilter(streamFilter, lastPosition);
-            var filterExpression = CreateFilterExpression(null, null);
+            var filterDefinition = FilterBuilder.CreateByFilter(streamFilter, lastPosition);
+            var filterExpression = FilterBuilder.CreateExpression(null, null);
 
             return QueryAsync(callback, lastPosition, filterDefinition, filterExpression, ct);
         }
 
-        private async Task QueryAsync(Func<StoredEvent, Task> callback, StreamPosition lastPosition, IQueryable<CosmosDbEventCommit> query, EventPredicate filterExpression, CancellationToken ct = default)
+        private async Task QueryAsync(Func<StoredEvent, Task> callback, StreamPosition lastPosition, SqlQuerySpec query, EventPredicate filterExpression, CancellationToken ct = default)
         {
             using (Profiler.TraceMethod<CosmosDbEventStore>())
             {
-                var documentQuery = query.AsDocumentQuery();
-
-                while (documentQuery.HasMoreResults && !ct.IsCancellationRequested)
-                {
-                    var commits = await documentQuery.ExecuteNextAsync<CosmosDbEventCommit>(ct);
-
-                    foreach (var commit in commits)
+                await documentClient.QueryAsync(collectionUri, query, async commit =>
                 {
                     var eventStreamOffset = (int)commit.EventStreamOffset;
 
@@ -133,28 +120,8 @@ namespace Squidex.Infrastructure.EventSourcing
 
                         commitOffset++;
                     }
+                }, ct);
             }
         }
     }
-        }
-
-        private IQueryable<CosmosDbEventCommit> CreateFilter(string property, object value, StreamPosition streamPosition)
-        {
-            var query = FilterBuilder.ByProperty(property, value, streamPosition);
-
-            return documentClient.CreateDocumentQuery<CosmosDbEventCommit>(collectionUri, query);
-        }
-
-        private IQueryable<CosmosDbEventCommit> CreateFilter(string streamFilter, StreamPosition streamPosition)
-        {
-            var query = FilterBuilder.ByFilter(streamFilter, streamPosition);
-
-            return documentClient.CreateDocumentQuery<CosmosDbEventCommit>(collectionUri, query);
-        }
-
-        private static EventPredicate CreateFilterExpression(string property, object value)
-        {
-            return FilterBuilder.CreateFilterExpression(property, value);
-        }
-    }
 }

src/Squidex.Infrastructure.Azure/EventSourcing/CosmosDbEventStore_Writer.cs

@@ -25,7 +25,12 @@ namespace Squidex.Infrastructure.EventSourcing
 
         public Task DeleteStreamAsync(string streamName)
         {
-            return Task.CompletedTask;
+            var query = FilterBuilder.AllIds(streamName);
+
+            return documentClient.QueryAsync(collectionUri, query, commit =>
+            {
+                return documentClient.DeleteDocumentAsync(UriFactory.CreateDocumentUri(databaseId, collectionId, commit.Id.ToString()));
+            });
         }
 
         public Task AppendAsync(Guid commitId, string streamName, ICollection<EventData> events)

src/Squidex.Infrastructure.Azure/EventSourcing/FilterBuilder.cs

@@ -7,7 +7,11 @@
 
 using System;
 using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
 using Microsoft.Azure.Documents;
+using Microsoft.Azure.Documents.Client;
+using Microsoft.Azure.Documents.Linq;
 using Squidex.Infrastructure.Json.Objects;
 
 namespace Squidex.Infrastructure.EventSourcing
@@ -16,11 +20,53 @@ namespace Squidex.Infrastructure.EventSourcing
     {
         public const string Collection = "Events";
 
+        public static readonly string CommitId = nameof(CosmosDbEventCommit.Id).ToCamelCase();
         public static readonly string EventsCountField = nameof(CosmosDbEventCommit.EventsCount).ToCamelCase();
         public static readonly string EventStreamOffsetField = nameof(CosmosDbEventCommit.EventStreamOffset).ToCamelCase();
         public static readonly string EventStreamField = nameof(CosmosDbEventCommit.EventStream).ToCamelCase();
         public static readonly string TimestampField = nameof(CosmosDbEventCommit.Timestamp).ToCamelCase();
 
+        public static async Task QueryAsync(this DocumentClient documentClient, Uri collectionUri, SqlQuerySpec querySpec, Func<CosmosDbEventCommit, Task> handler, CancellationToken ct = default)
+        {
+            var query =
+                documentClient.CreateDocumentQuery<CosmosDbEventCommit>(collectionUri, querySpec)
+                    .AsDocumentQuery();
+
+            using (query)
+            {
+                var result = new List<StoredEvent>();
+
+                while (query.HasMoreResults && !ct.IsCancellationRequested)
+                {
+                    var commits = await query.ExecuteNextAsync<CosmosDbEventCommit>(ct);
+
+                    foreach (var commit in commits)
+                    {
+                        await handler(commit);
+                    }
+                }
+            }
+        }
+
+        public static SqlQuerySpec AllIds(string streamName)
+        {
+            var query =
+                $"SELECT TOP 1 " +
+                $"  e.{CommitId}," +
+                $"  e.{EventsCountField} " +
+                $"FROM {Collection} e " +
+                $"WHERE " +
+                $"    e.{EventStreamField} = @name " +
+                $"ORDER BY e.{EventStreamOffsetField} DESC";
+
+            var parameters = new SqlParameterCollection
+            {
+                new SqlParameter("@name", streamName)
+            };
+
+            return new SqlQuerySpec(query, parameters);
+        }
+
         public static SqlQuerySpec LastPosition(string streamName)
         {
             var query =
@@ -59,7 +105,7 @@ namespace Squidex.Infrastructure.EventSourcing
             return new SqlQuerySpec(query, parameters);
         }
 
-        public static SqlQuerySpec ByProperty(string property, object value, StreamPosition streamPosition)
+        public static SqlQuerySpec CreateByProperty(string property, object value, StreamPosition streamPosition)
         {
             var filters = new List<string>();
 
@@ -71,7 +117,7 @@ namespace Squidex.Infrastructure.EventSourcing
             return BuildQuery(filters, parameters);
         }
 
-        public static SqlQuerySpec ByFilter(string streamFilter, StreamPosition streamPosition)
+        public static SqlQuerySpec CreateByFilter(string streamFilter, StreamPosition streamPosition)
         {
             var filters = new List<string>();
 
@@ -92,7 +138,7 @@ namespace Squidex.Infrastructure.EventSourcing
 
         private static void ForProperty(this List<string> filters, SqlParameterCollection parameters, string property, object value)
         {
-            filters.Add($"ARRAY_CONTAINS(e.events, {{ \"headers\": {{ \"{property}\": @value }} }}, true)");
+            filters.Add($"ARRAY_CONTAINS(e.events, {{ \"header\": {{ \"{property}\": @value }} }}, true)");
 
             parameters.Add(new SqlParameter("@value", value));
         }
@@ -128,7 +174,7 @@ namespace Squidex.Infrastructure.EventSourcing
             parameters.Add(new SqlParameter("@time", streamPosition.Timestamp));
         }
 
-        public static EventPredicate CreateFilterExpression(string property, object value)
+        public static EventPredicate CreateExpression(string property, object value)
         {
             if (!string.IsNullOrWhiteSpace(property))
             {