GH-692 Fix reactive support in Azure FunctionInvoker

Resolves #692

spring-cloud-function-samples/function-sample-azure/src/main/java/example/Config.java

@@ -27,6 +27,8 @@ import org.springframework.messaging.Message;
 
 import com.microsoft.azure.functions.ExecutionContext;
 
+import reactor.core.publisher.Mono;
+
 @SpringBootApplication
 public class Config {
 
@@ -65,5 +67,13 @@ public class Config {
 		};
 	}
 
+
+	@Bean
+	public Function<Mono<String>, Mono<String>> uppercaseReactive() {
+		return mono -> mono.map(value -> {
+			return value.toUpperCase();
+		});
+	}
+
 }
 

spring-cloud-function-samples/function-sample-azure/src/main/java/example/ReactiveUppercaseHandler.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2012-2020 the original author or 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
+ *
+ *      https://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.
+ */
+
+package example;
+
+import com.microsoft.azure.functions.ExecutionContext;
+import com.microsoft.azure.functions.HttpMethod;
+import com.microsoft.azure.functions.HttpRequestMessage;
+import com.microsoft.azure.functions.annotation.AuthorizationLevel;
+import com.microsoft.azure.functions.annotation.FunctionName;
+import com.microsoft.azure.functions.annotation.HttpTrigger;
+
+import java.util.Optional;
+
+import org.springframework.cloud.function.adapter.azure.FunctionInvoker;
+
+/**
+ * @author Oleg Zhurakousky
+ */
+public class ReactiveUppercaseHandler extends FunctionInvoker<String, String> {
+
+	@FunctionName("uppercaseReactive")
+	public String execute(@HttpTrigger(name = "req", methods = {HttpMethod.GET,
+			HttpMethod.POST}, authLevel = AuthorizationLevel.ANONYMOUS) HttpRequestMessage<Optional<String>> request,
+		ExecutionContext context) {
+		return handleRequest(request.getBody().get(), context);
+	}
+
+}