Make Estimote Cloud interactions asynchronous with timeouts to avoid …

…blocking UI.

Sensus.Shared/Extensions/WebRequestExtensions.cs

@@ -0,0 +1,38 @@
+// Copyright 2014 The Rector & Visitors of the University of Virginia
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+using System;
+using System.Net;
+using System.Threading.Tasks;
+
+namespace Sensus.Extensions
+{
+    public static class WebRequestExtensions
+    {
+        public static async Task<WebResponse> GetResponseAsync(this WebRequest webRequest, TimeSpan? timeout = null)
+        {
+            Task<WebResponse> webResponseTask = webRequest.GetResponseAsync();
+            Task timeoutTask = Task.Delay((int)(timeout?.TotalMilliseconds ?? int.MaxValue));
+
+            Task completedTask = await Task.WhenAny(webResponseTask, timeoutTask);
+
+            if (completedTask == timeoutTask)
+            {
+                throw new TimeoutException("Timed out.");
+            }
+
+            return await webResponseTask;
+        }
+    }
+}

Sensus.Shared/Probes/Location/EstimoteBeaconProbe.cs

@@ -24,6 +24,7 @@
 using Newtonsoft.Json.Linq;
 using Sensus.Concurrent;
 using System.Threading.Tasks;
+using Sensus.Extensions;
 
 namespace Sensus.Probes.Location
 {
@@ -180,7 +181,7 @@ protected override async Task InitializeAsync()
             }
         }
 
-        public List<string> GetBeaconTagsFromCloud()
+        public async Task<List<string>> GetBeaconTagsFromCloudAsync(TimeSpan? timeout = null)
         {
             List<string> tags = new List<string>();
 
@@ -191,7 +192,7 @@ public List<string> GetBeaconTagsFromCloud()
                 request.Method = "GET";
                 request.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(Encoding.ASCII.GetBytes(EstimoteCloudAppId + ":" + EstimoteCloudAppToken)));
 
-                using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
+                using (HttpWebResponse response = await request.GetResponseAsync(timeout) as HttpWebResponse)
                 {
                     if (response.StatusCode != HttpStatusCode.OK)
                     {
@@ -235,7 +236,7 @@ public List<string> GetBeaconTagsFromCloud()
             return tags;
         }
 
-        public List<EstimoteLocation> GetLocationsFromCloud()
+        public async Task<List<EstimoteLocation>> GetLocationsFromCloudAsync(TimeSpan? timeout)
         {
             List<EstimoteLocation> locations = new List<EstimoteLocation>();
 
@@ -246,7 +247,7 @@ public List<EstimoteLocation> GetLocationsFromCloud()
                 request.Method = "GET";
                 request.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(Encoding.ASCII.GetBytes(EstimoteCloudAppId + ":" + EstimoteCloudAppToken)));
 
-                using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
+                using (HttpWebResponse response = await request.GetResponseAsync(timeout) as HttpWebResponse)
                 {
                     if (response.StatusCode != HttpStatusCode.OK)
                     {

Sensus.Shared/Sensus.Shared.projitems

@@ -272,6 +272,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Probes\Location\EstimoteIndoorLocationAccuracy.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Extensions\JsonDotNetExtensions.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Extensions\TypeExtensions.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Extensions\WebRequestExtensions.cs" />
   </ItemGroup>
   <ItemGroup>
     <Folder Include="$(MSBuildThisFileDirectory)Probes\User\MicrosoftBand\" />

Sensus.Shared/UI/EstimoteBeaconProbeBeaconsPage.cs

@@ -60,7 +60,7 @@ public EstimoteBeaconProbeBeaconsPage(EstimoteBeaconProbe probe)
                 List<string> beaconTags;
                 try
                 {
-                    beaconTags = estimoteBeaconProbe.GetBeaconTagsFromCloud();
+                    beaconTags = await estimoteBeaconProbe.GetBeaconTagsFromCloudAsync(TimeSpan.FromSeconds(10));
 
                     if (beaconTags.Count == 0)
                     {
@@ -69,7 +69,7 @@ public EstimoteBeaconProbeBeaconsPage(EstimoteBeaconProbe probe)
                 }
                 catch (Exception ex)
                 {
-                    await SensusServiceHelper.Get().FlashNotificationAsync("Cannot add beacon:  " + ex);
+                    await SensusServiceHelper.Get().FlashNotificationAsync("Failed to add beacon:  " + ex.Message);
                     return;
                 }
 

Sensus.Shared/UI/ProbePage.cs

@@ -207,7 +207,7 @@ public ProbePage(Probe probe)
                     List<EstimoteLocation> locations;
                     try
                     {
-                        locations = estimoteBeaconProbe.GetLocationsFromCloud();
+                        locations = await estimoteBeaconProbe.GetLocationsFromCloudAsync(TimeSpan.FromSeconds(10));
 
                         if (locations.Count == 0)
                         {
@@ -216,7 +216,7 @@ public ProbePage(Probe probe)
                     }
                     catch (Exception ex)
                     {
-                        await SensusServiceHelper.Get().FlashNotificationAsync("Cannot set location:  " + ex);
+                        await SensusServiceHelper.Get().FlashNotificationAsync("Failed to set location:  " + ex.Message);
                         return;
                     }