Merge pull request #479 from serverlessworkflow/feat-event-read-mode

Implement event read mode

Author: cdavernas

src/runner/Synapse.Runner/Services/Executors/ListenTaskExecutor.cs

@@ -62,7 +62,13 @@ protected override async Task DoExecuteAsync(CancellationToken cancellationToken
         if (this.Task.Definition.Foreach == null)
         {
             var context = await this.Task.CorrelateAsync(cancellationToken).ConfigureAwait(false);
-            await this.SetResultAsync(context, this.Task.Definition.Then, cancellationToken).ConfigureAwait(false);
+            var events = this.Task.Definition.Listen.Read switch
+            {
+                EventReadMode.Data or EventReadMode.Raw => context.Events.Select(e => e.Value.Data),
+                EventReadMode.Envelope => context.Events.Select(e => e.Value.Data),
+                _ => throw new NotSupportedException($"The specified event read mode '{this.Task.Definition.Listen.Read}' is not supported")
+            };
+            await this.SetResultAsync(events, this.Task.Definition.Then, cancellationToken).ConfigureAwait(false);
         }
         else
         {
@@ -107,7 +113,12 @@ protected virtual async Task OnStreamingEventAsync(IStreamedCloudEvent e)
                 ]
             };
             var arguments = this.GetExpressionEvaluationArguments();
-            var eventData = e.Event as object;
+            var eventData = this.Task.Definition.Listen.Read switch
+            {
+                EventReadMode.Data or EventReadMode.Raw => e.Event.Data,
+                EventReadMode.Envelope => e.Event,
+                _ => throw new NotSupportedException($"The specified event read mode '{this.Task.Definition.Listen.Read}' is not supported")
+            };
             if (this.Task.Definition.Foreach.Output?.As is string fromExpression) eventData = await this.Task.Workflow.Expressions.EvaluateAsync<object>(fromExpression, eventData ?? new(), arguments, this.CancellationTokenSource!.Token).ConfigureAwait(false);
             else if (this.Task.Definition.Foreach.Output?.As != null) eventData = await this.Task.Workflow.Expressions.EvaluateAsync<object>(this.Task.Definition.Foreach.Output.As!, eventData ?? new(), arguments, this.CancellationTokenSource!.Token).ConfigureAwait(false);
             if (this.Task.Definition.Foreach.Export?.As is string toExpression)