GetChannelMetadataOperation.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.Net;
#if !NET35 && !NET40
using System.Collections.Concurrent;
#endif

namespace PubnubApi.EndPoint
{
    public class GetChannelMetadataOperation : PubnubCoreBase
    {
        private readonly PNConfiguration config;
        private readonly IJsonPluggableLibrary jsonLibrary;
        private readonly IPubnubUnitTest unit;
        private readonly IPubnubLog pubnubLog;
        private readonly EndPoint.TelemetryManager pubnubTelemetryMgr;

        private string chMetadataId = "";
        private bool includeCustom;

        private PNCallback<PNGetChannelMetadataResult> savedCallback;
        private Dictionary<string, object> queryParam;

        public GetChannelMetadataOperation(PNConfiguration pubnubConfig, IJsonPluggableLibrary jsonPluggableLibrary, IPubnubUnitTest pubnubUnit, IPubnubLog log, EndPoint.TelemetryManager telemetryManager, EndPoint.TokenManager tokenManager, Pubnub instance) : base(pubnubConfig, jsonPluggableLibrary, pubnubUnit, log, telemetryManager, tokenManager, instance)
        {
            config = pubnubConfig;
            jsonLibrary = jsonPluggableLibrary;
            unit = pubnubUnit;
            pubnubLog = log;
            pubnubTelemetryMgr = telemetryManager;

            if (instance != null)
            {
                if (!ChannelRequest.ContainsKey(instance.InstanceId))
                {
                    ChannelRequest.GetOrAdd(instance.InstanceId, new ConcurrentDictionary<string, HttpWebRequest>());
                }
                if (!ChannelInternetStatus.ContainsKey(instance.InstanceId))
                {
                    ChannelInternetStatus.GetOrAdd(instance.InstanceId, new ConcurrentDictionary<string, bool>());
                }
                if (!ChannelGroupInternetStatus.ContainsKey(instance.InstanceId))
                {
                    ChannelGroupInternetStatus.GetOrAdd(instance.InstanceId, new ConcurrentDictionary<string, bool>());
                }
            }
        }

        public GetChannelMetadataOperation Channel(string channelName)
        {
            this.chMetadataId = channelName;
            return this;
        }

        public GetChannelMetadataOperation IncludeCustom(bool includeCustomData)
        {
            this.includeCustom = includeCustomData;
            return this;
        }

        public GetChannelMetadataOperation QueryParam(Dictionary<string, object> customQueryParam)
        {
            this.queryParam = customQueryParam;
            return this;
        }

        public void Execute(PNCallback<PNGetChannelMetadataResult> callback)
        {
            if (callback == null)
            {
                throw new ArgumentException("Missing callback");
            }
            if (string.IsNullOrEmpty(this.chMetadataId))
            {
                throw new ArgumentException("Missing Channel");
            }

#if NETFX_CORE || WINDOWS_UWP || UAP || NETSTANDARD10 || NETSTANDARD11 || NETSTANDARD12
            Task.Factory.StartNew(() =>
            {
                this.savedCallback = callback;
                GetSingleChannelMetadata(this.chMetadataId, this.includeCustom, this.queryParam, savedCallback);
            }, CancellationToken.None, TaskCreationOptions.PreferFairness, TaskScheduler.Default).ConfigureAwait(false);
#else
            new Thread(() =>
            {
                this.savedCallback = callback;
                GetSingleChannelMetadata(this.chMetadataId, this.includeCustom, this.queryParam, savedCallback);
            })
            { IsBackground = true }.Start();
#endif
        }

        public async Task<PNResult<PNGetChannelMetadataResult>> ExecuteAsync()
        {
            return await GetSingleChannelMetadata(this.chMetadataId, this.includeCustom, this.queryParam).ConfigureAwait(false);
        }

        internal void Retry()
        {
#if NETFX_CORE || WINDOWS_UWP || UAP || NETSTANDARD10 || NETSTANDARD11 || NETSTANDARD12
            Task.Factory.StartNew(() =>
            {
                GetSingleChannelMetadata(this.chMetadataId, this.includeCustom, this.queryParam, savedCallback);
            }, CancellationToken.None, TaskCreationOptions.PreferFairness, TaskScheduler.Default).ConfigureAwait(false);
#else
            new Thread(() =>
            {
                GetSingleChannelMetadata(this.chMetadataId, this.includeCustom, this.queryParam, savedCallback);
            })
            { IsBackground = true }.Start();
#endif
        }

        private void GetSingleChannelMetadata(string spaceId, bool includeCustom, Dictionary<string, object> externalQueryParam, PNCallback<PNGetChannelMetadataResult> callback)
        {
            IUrlRequestBuilder urlBuilder = new UrlRequestBuilder(config, jsonLibrary, unit, pubnubLog, pubnubTelemetryMgr, (PubnubInstance != null && !string.IsNullOrEmpty(PubnubInstance.InstanceId) && PubnubTokenMgrCollection.ContainsKey(PubnubInstance.InstanceId)) ? PubnubTokenMgrCollection[PubnubInstance.InstanceId] : null, (PubnubInstance != null) ? PubnubInstance.InstanceId : "");
            
            Uri request = urlBuilder.BuildGetSingleChannelMetadataRequest("GET", "", spaceId, includeCustom, externalQueryParam);

            RequestState<PNGetChannelMetadataResult> requestState = new RequestState<PNGetChannelMetadataResult>();
            requestState.ResponseType = PNOperationType.PNGetChannelMetadataOperation;
            requestState.PubnubCallback = callback;
            requestState.Reconnect = false;
            requestState.EndPointOperation = this;

            requestState.UsePostMethod = false;
            UrlProcessRequest(request, requestState, false).ContinueWith(r =>
            {
                string json = r.Result.Item1;
                if (!string.IsNullOrEmpty(json))
                {
                    List<object> result = ProcessJsonResponse(requestState, json);
                    ProcessResponseCallbacks(result, requestState);
                }
                else
                {
                    if (r.Result.Item2 != null)
                    {
                        callback.OnResponse(null, r.Result.Item2);
                    }
                }
            }, TaskContinuationOptions.ExecuteSynchronously).Wait();
        }

        private async Task<PNResult<PNGetChannelMetadataResult>> GetSingleChannelMetadata(string spaceId, bool includeCustom, Dictionary<string, object> externalQueryParam)
        {
            PNResult<PNGetChannelMetadataResult> ret = new PNResult<PNGetChannelMetadataResult>();

            if (string.IsNullOrEmpty(this.chMetadataId))
            {
                PNStatus errStatus = new PNStatus { Error = true, ErrorData = new PNErrorData("Missing Channel", new ArgumentException("Missing Channel")) };
                ret.Status = errStatus;
                return ret;
            }

            IUrlRequestBuilder urlBuilder = new UrlRequestBuilder(config, jsonLibrary, unit, pubnubLog, pubnubTelemetryMgr, (PubnubInstance != null && !string.IsNullOrEmpty(PubnubInstance.InstanceId) && PubnubTokenMgrCollection.ContainsKey(PubnubInstance.InstanceId)) ? PubnubTokenMgrCollection[PubnubInstance.InstanceId] : null, (PubnubInstance != null) ? PubnubInstance.InstanceId : "");
            
            Uri request = urlBuilder.BuildGetSingleChannelMetadataRequest("GET", "", spaceId, includeCustom, externalQueryParam);

            RequestState<PNGetChannelMetadataResult> requestState = new RequestState<PNGetChannelMetadataResult>();
            requestState.ResponseType = PNOperationType.PNGetChannelMetadataOperation;
            requestState.Reconnect = false;
            requestState.EndPointOperation = this;

            requestState.UsePostMethod = false;
            Tuple<string, PNStatus> JsonAndStatusTuple = await UrlProcessRequest(request, requestState, false).ConfigureAwait(false);
            ret.Status = JsonAndStatusTuple.Item2;
            string json = JsonAndStatusTuple.Item1;
            if (!string.IsNullOrEmpty(json))
            {
                List<object> resultList = ProcessJsonResponse(requestState, json);
                ResponseBuilder responseBuilder = new ResponseBuilder(config, jsonLibrary, pubnubLog);
                PNGetChannelMetadataResult responseResult = responseBuilder.JsonToObject<PNGetChannelMetadataResult>(resultList, true);
                if (responseResult != null)
                {
                    ret.Result = responseResult;
                }
            }

            return ret;
        }
    }
}