DeleteFileOperation.cs

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

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

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

        private string channelName;
        private string currentFileId;
        private string currentFileName;

        public DeleteFileOperation(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 DeleteFileOperation Channel(string channel)
        {
            this.channelName = channel;
            return this;
        }

        public DeleteFileOperation FileId(string fileId)
        {
            this.currentFileId = fileId;
            return this;
        }

        public DeleteFileOperation FileName(string fileName)
        {
            this.currentFileName = fileName;
            return this;
        }

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

        public void Execute(PNCallback<PNDeleteFileResult> callback)
        {
            if (callback == null)
            {
                throw new ArgumentException("Missing callback");
            }
            if (string.IsNullOrEmpty(this.channelName))
            {
                throw new ArgumentException("Missing Channel Name");
            }
            if (string.IsNullOrEmpty(this.currentFileId))
            {
                throw new ArgumentException("Missing File Id");
            }
            if (string.IsNullOrEmpty(this.currentFileName))
            {
                throw new ArgumentException("Missing File Name");
            }

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

        public async Task<PNResult<PNDeleteFileResult>> ExecuteAsync()
        {
            return await ProcessDeleteFileRequest(this.queryParam).ConfigureAwait(false);
        }

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

        private void ProcessDeleteFileRequest(Dictionary<string, object> externalQueryParam, PNCallback<PNDeleteFileResult> 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.BuildGetFileUrlOrDeleteReqest("DELETE", "", this.channelName, this.currentFileId, this.currentFileName, externalQueryParam, PNOperationType.PNDeleteFileOperation);

            RequestState<PNDeleteFileResult> requestState = new RequestState<PNDeleteFileResult>();
            requestState.ResponseType = PNOperationType.PNDeleteFileOperation;
            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<PNDeleteFileResult>> ProcessDeleteFileRequest(Dictionary<string, object> externalQueryParam)
        {
            PNResult<PNDeleteFileResult> ret = new PNResult<PNDeleteFileResult>();

            if (string.IsNullOrEmpty(this.channelName))
            {
                PNStatus errStatus = new PNStatus { Error = true, ErrorData = new PNErrorData("Invalid Channel name", new ArgumentException("Invalid Channel name")) };
                ret.Status = errStatus;
                return ret;
            }
            if (string.IsNullOrEmpty(this.currentFileId))
            {
                PNStatus errStatus = new PNStatus { Error = true, ErrorData = new PNErrorData("Missing File Id", new ArgumentException("Missing File Id")) };
                ret.Status = errStatus;
                return ret;
            }

            if (string.IsNullOrEmpty(this.currentFileName))
            {
                PNStatus errStatus = new PNStatus { Error = true, ErrorData = new PNErrorData("Invalid file name", new ArgumentException("Invalid file name")) };
                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.BuildGetFileUrlOrDeleteReqest("DELETE", "", this.channelName, this.currentFileId, this.currentFileName, externalQueryParam, PNOperationType.PNDeleteFileOperation);

            RequestState<PNDeleteFileResult> requestState = new RequestState<PNDeleteFileResult>();
            requestState.ResponseType = PNOperationType.PNDeleteFileOperation;
            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);
                PNDeleteFileResult responseResult = responseBuilder.JsonToObject<PNDeleteFileResult>(resultList, true);
                if (responseResult != null)
                {
                    ret.Result = responseResult;
                }
            }

            return ret;
        }

    }
}