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Added workflow sample: Task chaining (dapr#1387)
* Added Workflow Task Chaining example to replace dapr#1206 Signed-off-by: Whit Waldo <[email protected]> * Targeting .NET 6, fixed transposition error Signed-off-by: Whit Waldo <[email protected]> * Added missing copyright headers Signed-off-by: Whit Waldo <[email protected]> --------- Signed-off-by: Whit Waldo <[email protected]> Signed-off-by: Siri Varma Vegiraju <[email protected]>
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‎all.sln‎

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@@ -119,6 +119,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Dapr.Common", "src\Dapr.Com
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Dapr.Common.Test", "test\Dapr.Common.Test\Dapr.Common.Test.csproj", "{CDB47863-BEBD-4841-A807-46D868962521}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WorkflowTaskChaining", "examples\Workflow\WorkflowTaskChaining\WorkflowTaskChaining.csproj", "{945DD3B7-94E5-435E-B3CB-796C20A652C7}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WorkflowSubworkflow", "examples\Workflow\WorkflowSubworkflow\WorkflowSubworkflow.csproj", "{FD3E9371-3134-4235-8E80-32226DFB4B1F}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WorkflowFanOutFanIn", "examples\Workflow\WorkflowFanOutFanIn\WorkflowFanOutFanIn.csproj", "{D83B27F3-4401-42F5-843E-147566B4999A}"
@@ -323,6 +325,10 @@ Global
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{CDB47863-BEBD-4841-A807-46D868962521}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{CDB47863-BEBD-4841-A807-46D868962521}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{CDB47863-BEBD-4841-A807-46D868962521}.Release|Any CPU.Build.0 = Release|Any CPU
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{945DD3B7-94E5-435E-B3CB-796C20A652C7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{945DD3B7-94E5-435E-B3CB-796C20A652C7}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{945DD3B7-94E5-435E-B3CB-796C20A652C7}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{945DD3B7-94E5-435E-B3CB-796C20A652C7}.Release|Any CPU.Build.0 = Release|Any CPU
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{FD3E9371-3134-4235-8E80-32226DFB4B1F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{FD3E9371-3134-4235-8E80-32226DFB4B1F}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{FD3E9371-3134-4235-8E80-32226DFB4B1F}.Release|Any CPU.ActiveCfg = Release|Any CPU
@@ -415,6 +421,7 @@ Global
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{DFBABB04-50E9-42F6-B470-310E1B545638} = {27C5D71D-0721-4221-9286-B94AB07B58CF}
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{B445B19C-A925-4873-8CB7-8317898B6970} = {27C5D71D-0721-4221-9286-B94AB07B58CF}
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{CDB47863-BEBD-4841-A807-46D868962521} = {DD020B34-460F-455F-8D17-CF4A949F100B}
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{945DD3B7-94E5-435E-B3CB-796C20A652C7} = {BF3ED6BF-ADF3-4D25-8E89-02FB8D945CA9}
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{FD3E9371-3134-4235-8E80-32226DFB4B1F} = {BF3ED6BF-ADF3-4D25-8E89-02FB8D945CA9}
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{D83B27F3-4401-42F5-843E-147566B4999A} = {BF3ED6BF-ADF3-4D25-8E89-02FB8D945CA9}
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{00359961-0C50-4BB1-A794-8B06DE991639} = {BF3ED6BF-ADF3-4D25-8E89-02FB8D945CA9}

‎examples/Workflow/WorkflowTaskChaining/Activities/Step1.cs‎

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// ------------------------------------------------------------------------
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// Copyright 2024 The Dapr Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ------------------------------------------------------------------------
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using Dapr.Workflow;
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namespace WorkflowTaskChaining.Activities;
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internal sealed class Step1 : WorkflowActivity<int, int>
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{
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/// <summary>
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/// Override to implement async (non-blocking) workflow activity logic.
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/// </summary>
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/// <param name="context">Provides access to additional context for the current activity execution.</param>
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/// <param name="input">The deserialized activity input.</param>
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/// <returns>The output of the activity as a task.</returns>
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public override Task<int> RunAsync(WorkflowActivityContext context, int input)
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{
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Console.WriteLine($@"Step 1: Received input: {input}.");
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return Task.FromResult(input + 1);
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}
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}

‎examples/Workflow/WorkflowTaskChaining/Activities/Step2.cs‎

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// ------------------------------------------------------------------------
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// Copyright 2024 The Dapr Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ------------------------------------------------------------------------
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using Dapr.Workflow;
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namespace WorkflowTaskChaining.Activities;
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internal sealed class Step2 : WorkflowActivity<int, int>
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{
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/// <summary>
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/// Override to implement async (non-blocking) workflow activity logic.
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/// </summary>
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/// <param name="context">Provides access to additional context for the current activity execution.</param>
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/// <param name="input">The deserialized activity input.</param>
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/// <returns>The output of the activity as a task.</returns>
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public override Task<int> RunAsync(WorkflowActivityContext context, int input)
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{
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Console.WriteLine($@"Step 2: Received input: {input}.");
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return Task.FromResult(input + 2);
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}
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}

‎examples/Workflow/WorkflowTaskChaining/Activities/Step3.cs‎

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// ------------------------------------------------------------------------
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// Copyright 2024 The Dapr Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ------------------------------------------------------------------------
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using Dapr.Workflow;
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namespace WorkflowTaskChaining.Activities;
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internal sealed class Step3 : WorkflowActivity<int, int>
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{
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/// <summary>
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/// Override to implement async (non-blocking) workflow activity logic.
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/// </summary>
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/// <param name="context">Provides access to additional context for the current activity execution.</param>
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/// <param name="input">The deserialized activity input.</param>
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/// <returns>The output of the activity as a task.</returns>
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public override Task<int> RunAsync(WorkflowActivityContext context, int input)
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{
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Console.WriteLine($@"Step 3: Received input: {input}.");
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return Task.FromResult(input ^ 2);
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}
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}

‎examples/Workflow/WorkflowTaskChaining/Program.cs‎

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// ------------------------------------------------------------------------
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// Copyright 2024 The Dapr Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ------------------------------------------------------------------------
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using Dapr.Workflow;
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using Microsoft.Extensions.DependencyInjection;
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using Microsoft.Extensions.Hosting;
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using WorkflowTaskChaining.Activities;
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using WorkflowTaskChaining.Workflows;
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var builder = Host.CreateDefaultBuilder(args).ConfigureServices(services =>
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{
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services.AddDaprWorkflow(options =>
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{
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options.RegisterWorkflow<DemoWorkflow>();
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options.RegisterActivity<Step1>();
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options.RegisterActivity<Step2>();
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options.RegisterActivity<Step3>();
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});
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});
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// Start the app - this is the point where we connect to the Dapr sidecar to listen
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// for workflow work-items to execute
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using var host = builder.Build();
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await host.StartAsync();
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await using var scope = host.Services.CreateAsyncScope();
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var daprWorkflowClient = scope.ServiceProvider.GetRequiredService<DaprWorkflowClient>();
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//Check health
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const int wfInput = 42;
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Console.WriteLine(@"Workflow Started");
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var instanceId = $"demo-workflow-{Guid.NewGuid().ToString()[..8]}";
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//Start the workflow immediately
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await daprWorkflowClient.ScheduleNewWorkflowAsync(nameof(DemoWorkflow), instanceId, wfInput);
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//Get the status of the workflow
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WorkflowState workflowState;
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while (true)
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{
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workflowState = await daprWorkflowClient.GetWorkflowStateAsync(instanceId, true);
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Console.WriteLine($@"Workflow status: {workflowState.RuntimeStatus}");
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if (workflowState.IsWorkflowCompleted)
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break;
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await Task.Delay(TimeSpan.FromSeconds(1));
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}
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//Display the result from the workflow
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var result = string.Join(" ", workflowState.ReadOutputAs<int[]>() ?? Array.Empty<int>());
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Console.WriteLine($@"Workflow result: {result}");
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‎examples/Workflow/WorkflowTaskChaining/WorkflowTaskChaining.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net6.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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<ItemGroup>
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<ProjectReference Include="..\..\..\src\Dapr.Workflow\Dapr.Workflow.csproj" />
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</ItemGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.Extensions.Hosting" />
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</ItemGroup>
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</Project>

‎examples/Workflow/WorkflowTaskChaining/Workflows/DemoWorkflow.cs‎

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// ------------------------------------------------------------------------
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// Copyright 2024 The Dapr Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ------------------------------------------------------------------------
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using Dapr.Workflow;
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using WorkflowTaskChaining.Activities;
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namespace WorkflowTaskChaining.Workflows;
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internal sealed class DemoWorkflow : Workflow<int, int[]>
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{
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/// <summary>
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/// Override to implement workflow logic.
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/// </summary>
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/// <param name="context">The workflow context.</param>
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/// <param name="input">The deserialized workflow input.</param>
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/// <returns>The output of the workflow as a task.</returns>
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public override async Task<int[]> RunAsync(WorkflowContext context, int input)
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{
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var result1 = await context.CallActivityAsync<int>(nameof(Step1), input);
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var result2 = await context.CallActivityAsync<int>(nameof(Step2), result1);
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var result3 = await context.CallActivityAsync<int>(nameof(Step3), result2);
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var ret = new int[] { result1, result2, result3 };
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return ret;
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}
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}

‎test/Dapr.E2E.Test/DaprCommand.cs‎

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public void Run()
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{
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Console.WriteLine($"Running command: {this.Command}");
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Console.WriteLine($@"Running command: {this.Command}");
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var escapedArgs = Command.Replace("\"", "\\\"");
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var process = new Process()
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{

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