DurableTask.AzureStorage API to enumerate instances

Test/DurableTask.AzureStorage.Tests/AzureStorageScenarioTests.cs

@@ -120,6 +120,31 @@ public async Task SequentialOrchestrationNoReplay()
                 await host.StopAsync();
             }
         }
+
+        [TestMethod]
+        public async Task GetAllOrchestrationStatuses()
+        {
+            using (TestOrchestrationHost host = TestHelpers.GetTestOrchestrationHost(enableExtendedSessions: false))
+            {
+                // Execute the orchestrator twice. Orchestrator will be replied. However instances might be two.
+                await host.StartAsync();
+                var client = await host.StartOrchestrationAsync(typeof(Orchestrations.SayHelloInline), "wolrd one");
+                await client.WaitForCompletionAsync(TimeSpan.FromSeconds(30));
+                client = await host.StartOrchestrationAsync(typeof(Orchestrations.SayHelloInline), "wolrd two");
+                await client.WaitForCompletionAsync(TimeSpan.FromSeconds(30));
+                // Create a client for testing
+                var serviceClient = host.GetServiceClient();
+                // TODO Currently we can't use TaskHub. It requires review of Core team. 
+                // Until then, we test it, not using TaskHub. Call diretly the method with some configuration. 
+                var results = await serviceClient.GetOrchestrationStateAsync();
+                Assert.AreEqual(2, results.Count);
+                Assert.AreEqual("\"Hello, wolrd one!\"", results[0].Output);
+                Assert.AreEqual("\"Hello, wolrd two!\"", results[1].Output);
+
+                await host.StopAsync();
+            }
+        }
+
         /// <summary>
         /// End-to-end test which validates parallel function execution by enumerating all files in the current directory 
         /// in parallel and getting the sum total of all file sizes.

Test/DurableTask.AzureStorage.Tests/TestOrchestrationHost.cs

@@ -50,6 +50,18 @@ public Task StopAsync()
             return this.worker.StopAsync(isForced: true);
         }
 
+        /// <summary>
+        /// This method is only for testing purpose. 
+        /// When we need to add fix to the DurableTask.Core (e.g. TaskHubClient), we need approval process. 
+        /// during wating for the approval, we can use this method to test the method. 
+        /// This method is not allowed for the production. Before going to the production, please refacotr to use TaskHubClient instead.
+        /// </summary>
+        /// <returns></returns>
+        internal AzureStorageOrchestrationService GetServiceClient()
+        {
+            return (AzureStorageOrchestrationService)this.client.serviceClient;
+        }
+
         public async Task<TestOrchestrationClient> StartOrchestrationAsync(
             Type orchestrationType,
             object input,

src/DurableTask.AzureStorage/AzureStorageOrchestrationService.cs

@@ -1543,6 +1543,16 @@ public async Task<OrchestrationState> GetOrchestrationStateAsync(string instance
             return await this.trackingStore.GetStateAsync(instanceId, executionId);
         }
 
+        /// <summary>
+        /// Get states of the all orchestration instances
+        /// </summary>
+        /// <returns>List of <see cref="OrchestrationState"/></returns>
+        public async Task<IList<OrchestrationState>> GetOrchestrationStateAsync(CancellationToken cancellationToken = default(CancellationToken))
+        {
+            await this.EnsureTaskHubAsync();
+            return await this.trackingStore.GetStateAsync(cancellationToken);
+        }
+
         /// <summary>
         /// Force terminates an orchestration by sending a execution terminated event
         /// </summary>

src/DurableTask.AzureStorage/DurableTask.AzureStorage.csproj

@@ -4,7 +4,7 @@
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;net451</TargetFrameworks>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
-    <Version>1.2.2</Version>
+    <Version>1.2.3</Version>
     <IncludeSymbols>true</IncludeSymbols>
     <Description>Azure Storage provider extension for the Durable Task Framework.</Description>
     <Authors>cgillum</Authors>

src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs

@@ -277,7 +277,11 @@ public override async Task<OrchestrationState> GetStateAsync(string instanceId,
             {
                 return null;
             }
+            return await ConvertFromAsync(orchestrationInstanceStatus, instanceId);
+        }
 
+        private async Task<OrchestrationState> ConvertFromAsync(OrchestrationInstanceStatus orchestrationInstanceStatus, string instanceId)
+        {
             var orchestrationState = new OrchestrationState();
             if (!Enum.TryParse(orchestrationInstanceStatus.RuntimeStatus, out orchestrationState.OrchestrationStatus))
             {
@@ -305,6 +309,36 @@ public override async Task<OrchestrationState> GetStateAsync(string instanceId,
             return orchestrationState;
         }
 
+        /// <inheritdoc />
+        public override async Task<IList<OrchestrationState>> GetStateAsync(CancellationToken cancellationToken = default(CancellationToken))
+        {
+            var query = new TableQuery<OrchestrationInstanceStatus>();
+            TableContinuationToken token = null;
+
+            var orchestrationStates = new List<OrchestrationState>(100);
+
+            while (true)
+            {
+                var segment = await this.instancesTable.ExecuteQuerySegmentedAsync(query, token); // TODO make sure if it has enough parameters
+
+                int previousCount = orchestrationStates.Count;
+                var tasks = segment.AsEnumerable<OrchestrationInstanceStatus>().Select(async x => await ConvertFromAsync(x, x.PartitionKey));
+                OrchestrationState[] result = await Task.WhenAll(tasks);
+                orchestrationStates.AddRange(result);
+
+                this.stats.StorageRequests.Increment();
+                this.stats.TableEntitiesRead.Increment(orchestrationStates.Count - previousCount);
+
+                token = segment.ContinuationToken;
+                if (token == null || cancellationToken.IsCancellationRequested)
+                {
+                    break;
+                }      
+            }
+
+            return orchestrationStates;
+        }
+
         /// <inheritdoc />
         public override Task PurgeHistoryAsync(DateTime thresholdDateTimeUtc, OrchestrationStateTimeRangeFilterType timeRangeFilterType)
         {

src/DurableTask.AzureStorage/Tracking/ITrackingStore.cs

@@ -75,6 +75,12 @@ interface ITrackingStore
         /// <param name="executionId">Execution Id</param>
         Task<OrchestrationState> GetStateAsync(string instanceId, string executionId);
 
+        /// <summary>
+        /// Get The Orchestration State for querying all orchestration instances
+        /// </summary>
+        /// <returns></returns>
+        Task<IList<OrchestrationState>> GetStateAsync(CancellationToken cancellationToken = default(CancellationToken));
+
         /// <summary>
         /// Used to set a state in the tracking store whenever a new execution is initiated from the client
         /// </summary>

src/DurableTask.AzureStorage/Tracking/InstanceStoreBackedTrackingStore.cs

@@ -95,6 +95,12 @@ public override async Task<OrchestrationState> GetStateAsync(string instanceId,
             }
         }
 
+        /// <inheritdoc />
+        public override Task<IList<OrchestrationState>> GetStateAsync(CancellationToken cancellationToken = default(CancellationToken))
+        {
+            throw new NotImplementedException();
+        }
+
         /// <inheritdoc />
         public override Task PurgeHistoryAsync(DateTime thresholdDateTimeUtc, OrchestrationStateTimeRangeFilterType timeRangeFilterType)
         {

src/DurableTask.AzureStorage/Tracking/TrackingStoreBase.cs

@@ -42,6 +42,9 @@ abstract class TrackingStoreBase : ITrackingStore
         /// <inheritdoc />
         public abstract Task<OrchestrationState> GetStateAsync(string instanceId, string executionId);
 
+        /// <inheritdoc />
+        public abstract Task<IList<OrchestrationState>> GetStateAsync(CancellationToken cancellationToken = default(CancellationToken));
+
         /// <inheritdoc />
         public abstract Task PurgeHistoryAsync(DateTime thresholdDateTimeUtc, OrchestrationStateTimeRangeFilterType timeRangeFilterType);