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Added workflow sample: Monitor (dapr#1388)
* Added workflow monitor Signed-off-by: Whit Waldo <[email protected]> * Restore to original argument names Signed-off-by: Whit Waldo <[email protected]> * Update to target .NET 6 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}") = "WorkflowMonitor", "examples\Workflow\WorkflowMonitor\WorkflowMonitor.csproj", "{7F73A3D8-FFC2-4E31-AA3D-A4840316A8C6}"
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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}"
@@ -325,6 +327,10 @@ 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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{7F73A3D8-FFC2-4E31-AA3D-A4840316A8C6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{7F73A3D8-FFC2-4E31-AA3D-A4840316A8C6}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{7F73A3D8-FFC2-4E31-AA3D-A4840316A8C6}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{7F73A3D8-FFC2-4E31-AA3D-A4840316A8C6}.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
@@ -421,6 +427,7 @@ 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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{7F73A3D8-FFC2-4E31-AA3D-A4840316A8C6} = {BF3ED6BF-ADF3-4D25-8E89-02FB8D945CA9}
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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}

‎examples/Workflow/WorkflowMonitor/Activities/CheckStatus.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 WorkflowMonitor.Activities;
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internal sealed class CheckStatus : WorkflowActivity<bool, string>
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{
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private static List<string> status = new List<string> { "healthy", "unhealthy" };
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private Random random = new();
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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<string> RunAsync(WorkflowActivityContext context, bool input) =>
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Task.FromResult<string>(status[random.Next(status.Count)]);
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}

‎examples/Workflow/WorkflowMonitor/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 WorkflowMonitor.Activities;
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using WorkflowMonitor.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<CheckStatus>();
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});
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});
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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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var instanceId = $"demo-workflow-{Guid.NewGuid().ToString()[..8]}";
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var isHealthy = true;
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await daprWorkflowClient.ScheduleNewWorkflowAsync(nameof(DemoWorkflow), instanceId, isHealthy);
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//We don't want to block on workflow completion as this workflow will never complete

‎examples/Workflow/WorkflowMonitor/WorkflowMonitor.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/WorkflowMonitor/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 WorkflowMonitor.Activities;
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namespace WorkflowMonitor.Workflows;
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internal sealed class DemoWorkflow : Workflow<bool, bool>
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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="isHealthy">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<bool> RunAsync(WorkflowContext context, bool isHealthy)
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{
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string status = await context.CallActivityAsync<string>(nameof(CheckStatus), true);
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int next_sleep_interval;
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if (!context.IsReplaying)
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{
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Console.WriteLine($"This job is {status}");
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}
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if (status == "healthy")
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{
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isHealthy = true;
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next_sleep_interval = 30;
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}
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else
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{
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if (isHealthy)
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{
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isHealthy = false;
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}
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Console.WriteLine("Status is unhealthy. Set check interval to 5s");
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next_sleep_interval = 5;
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}
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await context.CreateTimer(TimeSpan.FromSeconds(next_sleep_interval));
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context.ContinueAsNew(isHealthy);
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//This workflow will never complete
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return true;
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}
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}

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