F1.cs

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// Copyright © Microsoft Corporation.  All Rights Reserved.
// This code released under the terms of the 
// Microsoft Public License (MS-PL, http://opensource.org/licenses/ms-pl.html.)

using System;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Host;
using Microsoft.Azure.EventGrid.Models;
using Microsoft.Azure.WebJobs.Extensions.EventGrid;
using Microsoft.Extensions.Logging;
using Microsoft.Azure.EventGrid;

using System.Collections.Generic;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;

namespace FunctionFlow.NET
{
    public static class F1
    {
        [FunctionName("F1")]
        public static async Task Run([EventGridTrigger]EventGridEvent eventGridEvent, ILogger log)
        {
            string message = $"F1 got message {eventGridEvent.Data.ToString()}";
            log.LogInformation(message);

            string topicEndpoint  = Environment.GetEnvironmentVariable("EG_SECOND_EP");
            string topicKey  = Environment.GetEnvironmentVariable("EG_SECOND_KEY");

            // do some procssing 

            // pass notification to the next handler
            EventGridEvent mess = GetEvent(message);

            // get a connection
            string topicHostname = new Uri(topicEndpoint).Host;
            TopicCredentials topicCredentials = new TopicCredentials(topicKey);
            EventGridClient client = new EventGridClient(topicCredentials);

            List<EventGridEvent> eventsList = new List<EventGridEvent>();
            eventsList.Add(mess);
            try{
                await client.PublishEventsAsync(topicHostname,eventsList);
            }catch(Exception ex)
            {
               log.LogInformation($"Exception found {ex.Message}"); 
            }
            
        }

        private static EventGridEvent GetEvent(dynamic data)
        {
            EventGridEvent temp = new EventGridEvent();
            temp.Id = Guid.NewGuid().ToString();
            temp.Data = data;        
            temp.Subject = "F1";
            temp.EventTime = DateTime.Now;
            temp.EventType = "Function.Flow.2F2";
            temp.DataVersion = "2.0";            
            return temp;
        }
    }
}