Adding PubSub response type. (#453)

pubsub/responses.go

@@ -0,0 +1,23 @@
+// ------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+// ------------------------------------------------------------
+
+package pubsub
+
+// AppResponseStatus represents a status of a PubSub response.
+type AppResponseStatus string
+
+const (
+	// Success means the message is received and processed correctly.
+	Success AppResponseStatus = "SUCCESS"
+	// Retry means the message is received but could not be processed and must be retried.
+	Retry AppResponseStatus = "RETRY"
+	// Drop means the message is received but should not be processed.
+	Drop AppResponseStatus = "DROP"
+)
+
+// AppResponse is the object describing the response from user code after a pubsub event
+type AppResponse struct {
+	Status AppResponseStatus `json:"status"`
+}