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Added workflow sample: Monitor (dapr#1388)
* Added workflow monitor Signed-off-by: Whit Waldo <whit.waldo@innovian.net> * Restore to original argument names Signed-off-by: Whit Waldo <whit.waldo@innovian.net> * Update to target .NET 6 Signed-off-by: Whit Waldo <whit.waldo@innovian.net> * Added missing copyright headers Signed-off-by: Whit Waldo <whit.waldo@innovian.net> --------- Signed-off-by: Whit Waldo <whit.waldo@innovian.net> Signed-off-by: Divya Perumal <divzi.perumal@gmail.com>
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examples/Workflow/WorkflowMonitor/Activities/CheckStatus.cs
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| // ------------------------------------------------------------------------ | ||
| // Copyright 2024 The Dapr Authors | ||
| // 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. | ||
| // ------------------------------------------------------------------------ | ||
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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> | ||
| { | ||
| private static List<string> status = new List<string> { "healthy", "unhealthy" }; | ||
| private Random random = new(); | ||
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| /// <summary> | ||
| /// Override to implement async (non-blocking) workflow activity logic. | ||
| /// </summary> | ||
| /// <param name="context">Provides access to additional context for the current activity execution.</param> | ||
| /// <param name="input">The deserialized activity input.</param> | ||
| /// <returns>The output of the activity as a task.</returns> | ||
| public override Task<string> RunAsync(WorkflowActivityContext context, bool input) => | ||
| Task.FromResult<string>(status[random.Next(status.Count)]); | ||
| } |
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| // ------------------------------------------------------------------------ | ||
| // Copyright 2024 The Dapr Authors | ||
| // 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. | ||
| // ------------------------------------------------------------------------ | ||
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| using Dapr.Workflow; | ||
| using Microsoft.Extensions.DependencyInjection; | ||
| using Microsoft.Extensions.Hosting; | ||
| using WorkflowMonitor.Activities; | ||
| using WorkflowMonitor.Workflows; | ||
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| var builder = Host.CreateDefaultBuilder(args).ConfigureServices(services => | ||
| { | ||
| services.AddDaprWorkflow(options => | ||
| { | ||
| options.RegisterWorkflow<DemoWorkflow>(); | ||
| options.RegisterActivity<CheckStatus>(); | ||
| }); | ||
| }); | ||
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| using var host = builder.Build(); | ||
| await host.StartAsync(); | ||
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| await using var scope = host.Services.CreateAsyncScope(); | ||
| var daprWorkflowClient = scope.ServiceProvider.GetRequiredService<DaprWorkflowClient>(); | ||
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| var instanceId = $"demo-workflow-{Guid.NewGuid().ToString()[..8]}"; | ||
| var isHealthy = true; | ||
| 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 |
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| <Project Sdk="Microsoft.NET.Sdk"> | ||
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| <PropertyGroup> | ||
| <OutputType>Exe</OutputType> | ||
| <TargetFramework>net6.0</TargetFramework> | ||
| <ImplicitUsings>enable</ImplicitUsings> | ||
| <Nullable>enable</Nullable> | ||
| </PropertyGroup> | ||
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| <ItemGroup> | ||
| <ProjectReference Include="..\..\..\src\Dapr.Workflow\Dapr.Workflow.csproj" /> | ||
| </ItemGroup> | ||
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| <ItemGroup> | ||
| <PackageReference Include="Microsoft.Extensions.Hosting" /> | ||
| </ItemGroup> | ||
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| </Project> |
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examples/Workflow/WorkflowMonitor/Workflows/DemoWorkflow.cs
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| // ------------------------------------------------------------------------ | ||
| // Copyright 2024 The Dapr Authors | ||
| // 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. | ||
| // ------------------------------------------------------------------------ | ||
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| using Dapr.Workflow; | ||
| using WorkflowMonitor.Activities; | ||
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| namespace WorkflowMonitor.Workflows; | ||
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| internal sealed class DemoWorkflow : Workflow<bool, bool> | ||
| { | ||
| /// <summary> | ||
| /// Override to implement workflow logic. | ||
| /// </summary> | ||
| /// <param name="context">The workflow context.</param> | ||
| /// <param name="isHealthy">The deserialized workflow input.</param> | ||
| /// <returns>The output of the workflow as a task.</returns> | ||
| public override async Task<bool> RunAsync(WorkflowContext context, bool isHealthy) | ||
| { | ||
| string status = await context.CallActivityAsync<string>(nameof(CheckStatus), true); | ||
| int next_sleep_interval; | ||
| if (!context.IsReplaying) | ||
| { | ||
| Console.WriteLine($"This job is {status}"); | ||
| } | ||
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| if (status == "healthy") | ||
| { | ||
| isHealthy = true; | ||
| next_sleep_interval = 30; | ||
| } | ||
| else | ||
| { | ||
| if (isHealthy) | ||
| { | ||
| isHealthy = false; | ||
| } | ||
| Console.WriteLine("Status is unhealthy. Set check interval to 5s"); | ||
| next_sleep_interval = 5; | ||
| } | ||
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| await context.CreateTimer(TimeSpan.FromSeconds(next_sleep_interval)); | ||
| context.ContinueAsNew(isHealthy); | ||
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| //This workflow will never complete | ||
| return true; | ||
| } | ||
| } |