Allow publishing cloud events directly

src/Dapr.Client/CloudEvent.cs

@@ -0,0 +1,68 @@
+// ------------------------------------------------------------------------
+// Copyright 2021 The Dapr Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//     http://www.apache.org/licenses/LICENSE-2.0
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ------------------------------------------------------------------------
+
+using System;
+using System.Text.Json.Serialization;
+using Dapr.Client;
+
+namespace Dapr
+{
+	/// <summary>
+	/// Represents a CloudEvent without data.
+	/// </summary>        
+	public class CloudEvent
+	{
+		/// <summary>
+		/// CloudEvent 'source' attribute.
+		/// </summary>
+		[JsonPropertyName("source")]
+		public Uri Source { get; init; }
+
+		/// <summary>
+		/// CloudEvent 'type' attribute.
+		/// </summary>
+		[JsonPropertyName("type")]
+		public string Type { get; init; }
+
+		/// <summary>
+		/// CloudEvent 'subject' attribute.
+		/// </summary>
+		[JsonPropertyName("subject")]
+		public string Subject { get; init; }
+	}
+
+	/// <summary>
+	/// Represents a CloudEvent with typed data.
+	/// </summary>
+	public class CloudEvent<TData> : CloudEvent
+	{
+		/// <summary>
+		/// Initialize a new instance of the <see cref="CloudEvent{TData}"/> class.
+		/// </summary>
+		public CloudEvent(TData data)
+		{
+			Data = data;
+		}
+
+		/// <summary>
+		/// CloudEvent 'data' content.
+		/// </summary>
+		public TData Data { get; }
+
+		/// <summary>
+		/// Gets event data.
+		/// </summary>
+		[JsonPropertyName("datacontenttype")]
+		public string DataContentType { get; } = Constants.ContentTypeApplicationJson;
+	}
+}

src/Dapr.Client/Constants.cs

@@ -19,5 +19,6 @@ internal class Constants
     {
         public const string ContentTypeApplicationJson = MediaTypeNames.Application.Json;
         public const string ContentTypeApplicationGrpc = "application/grpc";
+        public const string ContentTypeCloudEvent = "application/cloudevents+json";
     }
 }

src/Dapr.Client/DaprClientGrpc.cs

@@ -78,7 +78,7 @@ public override Task PublishEventAsync<TData>(
             ArgumentVerifier.ThrowIfNull(data, nameof(data));
 
             var content = TypeConverters.ToJsonByteString(data, this.JsonSerializerOptions);
-            return MakePublishRequest(pubsubName, topicName, content, null, cancellationToken);
+            return MakePublishRequest(pubsubName, topicName, content, null, data is CloudEvent ? Constants.ContentTypeCloudEvent : null, cancellationToken);
         }
 
         public override Task PublishEventAsync<TData>(
@@ -94,7 +94,7 @@ public override Task PublishEventAsync<TData>(
             ArgumentVerifier.ThrowIfNull(metadata, nameof(metadata));
 
             var content = TypeConverters.ToJsonByteString(data, this.JsonSerializerOptions);
-            return MakePublishRequest(pubsubName, topicName, content, metadata, cancellationToken);
+            return MakePublishRequest(pubsubName, topicName, content, metadata, data is CloudEvent ? Constants.ContentTypeCloudEvent : null, cancellationToken);
         }
 
         /// <inheritdoc/>
@@ -105,7 +105,7 @@ public override Task PublishEventAsync(
         {
             ArgumentVerifier.ThrowIfNullOrEmpty(pubsubName, nameof(pubsubName));
             ArgumentVerifier.ThrowIfNullOrEmpty(topicName, nameof(topicName));
-            return MakePublishRequest(pubsubName, topicName, null, null, cancellationToken);
+            return MakePublishRequest(pubsubName, topicName, null, null, null, cancellationToken);
         }
 
         public override Task PublishEventAsync(
@@ -117,17 +117,17 @@ public override Task PublishEventAsync(
             ArgumentVerifier.ThrowIfNullOrEmpty(pubsubName, nameof(pubsubName));
             ArgumentVerifier.ThrowIfNullOrEmpty(topicName, nameof(topicName));
             ArgumentVerifier.ThrowIfNull(metadata, nameof(metadata));
-            return MakePublishRequest(pubsubName, topicName, null, metadata, cancellationToken);
+            return MakePublishRequest(pubsubName, topicName, null, metadata, null, cancellationToken);
         }
 
         private async Task MakePublishRequest(
             string pubsubName,
             string topicName,
             ByteString content,
             Dictionary<string, string> metadata,
+            string dataContentType,
             CancellationToken cancellationToken)
         {
-            // Create PublishEventEnvelope
             var envelope = new Autogenerated.PublishEventRequest()
             {
                 PubsubName = pubsubName,
@@ -137,8 +137,8 @@ private async Task MakePublishRequest(
             if (content != null)
             {
                 envelope.Data = content;
-                envelope.DataContentType = Constants.ContentTypeApplicationJson;
-            }
+                envelope.DataContentType = dataContentType ?? Constants.ContentTypeApplicationJson;
+			}
 
             if (metadata != null)
             {

test/Dapr.Client.Test/PublishEventApiTest.cs

@@ -137,6 +137,64 @@ public async Task PublishEventAsync_CanPublishTopicWithNoContent_WithMetadata()
             envelope.Metadata["key2"].Should().Be("value2");
         }
 
+        [Fact]
+        public async Task PublishEventAsync_CanPublishCloudEventWithData()
+        {
+            await using var client = TestClient.CreateForDaprClient();
+
+            var publishData = new PublishData() { PublishObjectParameter = "testparam" };
+            var cloudEvent = new CloudEvent<PublishData>(publishData)
+            {
+                Source = new Uri("urn:testsource"),
+                Type = "testtype",
+                Subject = "testsubject",
+            };
+            var request = await client.CaptureGrpcRequestAsync(async daprClient =>
+            {
+                await daprClient.PublishEventAsync<CloudEvent<PublishData>>(TestPubsubName, "test", cloudEvent);
+            });
+
+            request.Dismiss();
+
+            var envelope = await request.GetRequestEnvelopeAsync<PublishEventRequest>();
+            var jsonFromRequest = envelope.Data.ToStringUtf8();
+
+            envelope.DataContentType.Should().Be("application/cloudevents+json");
+            envelope.PubsubName.Should().Be(TestPubsubName);
+            envelope.Topic.Should().Be("test");
+            jsonFromRequest.Should().Be(JsonSerializer.Serialize(cloudEvent, client.InnerClient.JsonSerializerOptions));
+            envelope.Metadata.Count.Should().Be(0);
+        }
+
+        [Fact]
+        public async Task PublishEventAsync_CanPublishCloudEventWithNoContent()
+        {
+            await using var client = TestClient.CreateForDaprClient();
+
+            var publishData = new PublishData() { PublishObjectParameter = "testparam" };
+            var cloudEvent = new CloudEvent
+            {
+                Source = new Uri("urn:testsource"),
+                Type = "testtype",
+                Subject = "testsubject",
+            };
+            var request = await client.CaptureGrpcRequestAsync(async daprClient =>
+            {
+                await daprClient.PublishEventAsync<CloudEvent>(TestPubsubName, "test", cloudEvent);
+            });
+
+            request.Dismiss();
+
+            var envelope = await request.GetRequestEnvelopeAsync<PublishEventRequest>();
+            var jsonFromRequest = envelope.Data.ToStringUtf8();
+
+            envelope.DataContentType.Should().Be("application/cloudevents+json");
+            envelope.PubsubName.Should().Be(TestPubsubName);
+            envelope.Topic.Should().Be("test");
+            jsonFromRequest.Should().Be(JsonSerializer.Serialize(cloudEvent, client.InnerClient.JsonSerializerOptions));
+            envelope.Metadata.Count.Should().Be(0);
+        }
+
         [Fact]
         public async Task PublishEventAsync_WithCancelledToken()
         {