Renewing session using ISession wrapper

Hello, we are currently using the PlatformSession C# implementation to login to the RDP Api. We would like to maintain our session for a long period of time and query multiple instruments through it. This is our current implementation, obtained from parts unknown, as it was done before my time.

I saw a previous answer which used the POST mechanism to extend sessions. Is there a way to modify our current implementation that uses PlatformSession, or would you recommend moving completely over to the POST approach?

using System.Data;
using System.Diagnostics;
using System.Globalization;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using Org.BouncyCastle.Math.EC;
using Refinitiv.Data.Content.Data;
using Refinitiv.Data.Content.HistoricalPricing;
using Refinitiv.Data.Core;
using ReutersRdpApi.Enums;
using ReutersRdpApi.Interfaces;
using ReutersShared;

namespace ReutersRdpApi.Classes;

public class ReutersApi : IReutersApi
{
private ISession _session;
private ISession _openSession;
private readonly string _appKey;
private readonly string _userName;
private readonly string _password;
private Session.State _state;
private readonly ILogger _log;
private static readonly string _confFileName = "refinitiv-data.config.json";
private static readonly object _lock = new object();

public ReutersApi(string apiKey, string userName, string password, ILogger log = null)

{

    this._log = log;

    this._appKey = apiKey;

    this._userName = userName;

    this._password = password;

    if (!File.Exists(ReutersApi._confFileName)) CreateConfigFile();


    _openSession = CreateSession();

}


public static void CreateConfigFile()

{

    var config = @"{""sessions"": {

    ""default"": ""platform"",


    ""platform"": {

        ""default"": ""libsession"",


        ""libsession"": {

            ""apis"": {

                ""data"": {

                    ""historical-pricing"": {

                        ""url"": ""https://api.refinitiv.com/data/historical-pricing/v1""

                    }

                }

            }

        }

    }

    }

    }";


    lock (_lock)

    {

        File.WriteAllText(ReutersApi._confFileName, config);

    }

}


private ISession CreateSession()

{

    return PlatformSession.Definition().AppKey(this._appKey)

        .OAuthGrantType(new GrantPassword().UserName(this._userName).Password(this._password))

        .TakeSignonControl(true).GetSession().OnState(this.OnStateUpdate)

        .OnEvent(this.OnEventUpdate);

}


private ISession GetSession()

{

    return _openSession;

}


/// <summary>

/// Gets the bars from reuters using the full string Ric with expiry Tenor i.e CLZ2 - CME WTI Dec22.

/// </summary>

/// <param name="fullRic"></param>

/// <param name="barInterval"></param>

/// <param name="numberOfBars"></param>

/// <returns></returns>

public List<ReutersBar>? GetBars(string fullRic, Summaries.Interval barInterval, int numberOfBars)

{

    this._session = this.GetSession();

    var bars = new List<ReutersBar>();

    var fields = new string[]

    {

        ReutersFields.TimeStamp, ReutersFields.Open, ReutersFields.High, ReutersFields.Low, ReutersFields.Close

    };


    try

    {

        this._log?.LogInformation($"Opening Session.");

        var sw = new Stopwatch();

        sw.Start();

        while (this._state != Session.State.Opened)

        {

            this._session.Open();

            if (this._state != Session.State.Opened)

            {

                var newSession = CreateSession();

                this._session = newSession;

                this._openSession = newSession;

                var lastCode = this._session.LastEventCode;

                this._log?.LogWarning($"Session failed to open. Last event code: {lastCode.ToString()} Retrying. ");

                Task.Delay(1000);

            }

            if (sw.Elapsed > TimeSpan.FromSeconds(20))

            {

                this._log?.LogError($"Session connection timed out! Returning null!");

                return bars;

            }

        }


        this._log?.LogInformation($"Getting bars for {fullRic}");


        var result = Summaries.Definition(fullRic).Interval(barInterval).Fields(fields).Count((uint)numberOfBars).GetData();


        if (result.IsSuccess)

        {

            this._log?.LogInformation($"Bar request returned success.");


            if (result.Data.Records.Count == 0)

            {

                this._log?.LogInformation("No bars returned.");

                return bars;

            }


            var table = result.Data.Table;

            var cols = table.Columns;

            var barRecords = table.Rows;


            var ricInd = cols.IndexOf("Instrument");

            var openInd = cols.IndexOf(ReutersFields.Open);

            var highInd = cols.IndexOf(ReutersFields.High);

            var lowInd = cols.IndexOf(ReutersFields.Low);

            var closeInd = cols.IndexOf(ReutersFields.Close);

            var timeInd = cols.IndexOf(ReutersFields.TimeStamp);


            if(timeInd == -1) timeInd = cols.IndexOf("DATE");


            bars.AddRange(from DataRow data in barRecords

            select data.ItemArray

            into array

            select new ReutersBar

            {

                Ric = (string) array[ricInd],

                Timestamp = DateTime.Parse((string) array[timeInd], CultureInfo.InvariantCulture).ToUniversalTime(),

                Open = (double) array[openInd],

                High = (double) array[highInd],

                Low = (double) array[lowInd],

                Close = (double) array[closeInd]

            });

        }

    }

    catch (Exception e)

    {

        this._log?.LogInformation($"Failed to get bars for {fullRic} with error {e}");

    }

    finally

    {

    }


    return bars;

}


private void OnStateUpdate(Session.State state, string msg, ISession session)

{

    this._state = state;

    this._log?.LogInformation($"OnStateUpdate: state {state}, msg {msg}.");

}


private void OnEventUpdate(Session.EventCode eventCode, JObject msg, ISession arg3)

{

    this._log?.LogInformation($"OnEvent: code {eventCode}, msg {msg}.");

}

Thanks!