Amazon Kinesis

               

Scenario: Create Amazon Kinesis client to push data stream to AWS

Solution:

      Per Amazon:

      With Amazon Kinesis, you can ingest real-time data such as video, audio, application logs, website        clickstreams, and IoT telemetry data for machine learning, analytics, and other applications.

      

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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using Amazon;
using Amazon.Kinesis;
using Amazon.Kinesis.Model;
using Amazon.SecurityToken;
using Amazon.SecurityToken.Model;
using Timer = System.Timers.Timer;

namespace ConsoleApplication1
{
    public abstract class KinesisClient<T> : IKinesisClient where T : class
    {
        private readonly object _lock = new();
        private readonly ReaderWriterLockSlim _lockSlim = new();
        
        public void Publish(object data)
        {
            PublishData((T)data);
        }
        
        private void Send(PutRecordRequest request)
        {
            KinesisConnectionMultiplexer client;

            if (_disposed)
            {
                return;
            }

            _lockSlim.EnterReadLock();

            try
            {
                if (TryGetClient(_kinesisClients, out client))
                {
                    PublishDataStream(client, request);
                    return;
                }
            }
            finally
            {
                _lockSlim.ExitReadLock();
            }

            _lockSlim.EnterWriteLock();

            try
            {
                if (!TryGetClient(_kinesisClients, out client))
                {
                    //local
                    if (isLocal)
                    {
                        _kinesisClients = CreateClients(clientsecret, null);
                    }
                    else
                    {
                        //awsTemporaryCredentials.AccessKeyId}
                        //awsTemporaryCredentials.SecretAccessKey}
                        //awsTemporaryCredentials.SessionToken
                        //awsTemporaryCredentials.Expiration }");

                        var awsTemporaryCredentials = GetKinesisCredentials();

                        _kinesisClients = CreateClients(awsTemporaryCredentials);
                        TryGetClient(_kinesisClients, out client);
                    }
                }

                PublishDataStream(client, request);
            }
            finally
            {
                _lockSlim.ExitWriteLock();
            }
        }
        
        private void PublishData(T data)
        {
            Send(new PutRecordRequest
            {
                StreamName = "OrderStream",
                Data = new MemoryStream(Encoding.UTF8.GetBytes(json)),
                PartitionKey = DateTime.Now.ToString("yyyy-MM")
            });
        }
        
        private static KinesisConnectionMultiplexer[] CreateClients(Credentials awsCredentials)
        {
            var clients = new KinesisConnectionMultiplexer[MaxConnections];

            for (var i = 0; i < MaxConnections; i++)
            {
                clients[i] = new KinesisConnectionMultiplexer
                {
                    Client = !string.IsNullOrEmpty(ClientId)
                        ? new AmazonKinesisClient(ClientId, ClientSecret,
                            RegionEndpoint.GetBySystemName(Region) ?? RegionEndpoint.USEast1)
                        : new AmazonKinesisClient(awsCredentials?.AccessKeyId, awsCredentials?.SecretAccessKey,
                            awsCredentials?.SessionToken, RegionEndpoint.GetBySystemName(Region) ??
                                                         RegionEndpoint.USEast1),
                    ExpiryTime = awsCredentials?.Expiration ?? DateTime.MaxValue

                };
            }

            return clients;
        }

        public Credentials GetKinesisCredentials()
        {
            var roleArn = $"arn:aws:iam::{IamAccountId}:role/{IamRoleName}";

            var request = new AssumeRoleRequest
            {
                RoleArn = roleArn,
                RoleSessionName = $"{"Environment"}_kinesis_session",
                DurationSeconds = ConnectionDuration
            };

            var response =
                new AmazonSecurityTokenServiceClient(RegionEndpoint.GetBySystemName({"Region"}) ??}
                                                     RegionEndpoint.USEast1).AssumeRoleAsync(request);
        
            return response.Result.HttpStatusCode == System.Net.HttpStatusCode.OK ? response.Result.Credentials : null;
        }

        public bool TryGetClient(KinesisConnectionMultiplexer[] clients, out KinesisConnectionMultiplexer client)
        {
            if (clients == null || !clients.Any())
            {
                client = null;
                return false;
            }

            lock (clients)
            {
                client = clients.Where(k => DateTime.Now.AddSeconds(10) <= k.ExpiryTime).Min(client => client);
            }

            if (client == null)
            {
                return false;
            }

            Interlocked.Increment(ref client.Load);
            return true;
        }

        private void PublishDataStream(KinesisConnectionMultiplexer multiplexer, PutRecordRequest putRecordRequest)
        {
            ProcessPutRecordsRequest(multiplexer, putRecordRequest);
        }

        private void ProcessPutRecordsRequest(KinesisConnectionMultiplexer multiplexer,
            PutRecordRequest putRecordRequest)
        {
            var client = multiplexer.Client;
            var cts = new CancellationTokenSource();
            var ct = cts.Token;
            var task = client.PutRecordAsync(putRecordRequest, ct).Result;

            Interlocked.Decrement(ref multiplexer.Load);
        }
    }
}