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Signed-off-by: MregXN <[email protected]>
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14 changes: 14 additions & 0 deletions
14
examples/Workflow/WorkflowMonitor/Activities/CheckStatus.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| using Dapr.Workflow; | ||
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| namespace WorkflowMonitor.Activities | ||
| { | ||
| public class CheckStatus : WorkflowActivity<bool, string> | ||
| { | ||
| static List<string> status = new List<string>() { "healthy", "unhealthy" }; | ||
| Random random = new Random(); | ||
| public override Task<string> RunAsync(WorkflowActivityContext context, bool input) | ||
| { | ||
| return Task.FromResult<string>(status[random.Next(status.Count)]); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| using Dapr.Client; | ||
| using Dapr.Workflow; | ||
| using WorkflowMonitor.Activities; | ||
| using WorkflowMonitor.Workflows; | ||
| using Microsoft.Extensions.Hosting; | ||
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| const string DaprWorkflowComponent = "dapr"; | ||
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| // The workflow host is a background service that connects to the sidecar over gRPC | ||
| var builder = Host.CreateDefaultBuilder(args).ConfigureServices(services => | ||
| { | ||
| services.AddDaprWorkflow(options => | ||
| { | ||
| options.RegisterWorkflow<DemoWorkflow>(); | ||
| options.RegisterActivity<CheckStatus>(); | ||
| }); | ||
| }); | ||
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| // Dapr uses a random port for gRPC by default. If we don't know what that port | ||
| // is (because this app was started separate from dapr), then assume 4001. | ||
| if (string.IsNullOrEmpty(Environment.GetEnvironmentVariable("DAPR_GRPC_PORT"))) | ||
| { | ||
| Environment.SetEnvironmentVariable("DAPR_GRPC_PORT", "4001"); | ||
| } | ||
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| // Start the app - this is the point where we connect to the Dapr sidecar to | ||
| // listen for workflow work-items to execute. | ||
| using var host = builder.Build(); | ||
| host.Start(); | ||
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| DaprClient daprClient = new DaprClientBuilder().Build(); | ||
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| while (!await daprClient.CheckHealthAsync()) | ||
| { | ||
| Thread.Sleep(TimeSpan.FromSeconds(5)); | ||
| } | ||
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| using (daprClient) | ||
| { | ||
| Console.WriteLine($"Workflow Started."); | ||
| await daprClient.WaitForSidecarAsync(); | ||
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| string instanceId = $"demo-workflow-{Guid.NewGuid().ToString()[..8]}"; | ||
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| bool isHealthy = true; | ||
| await daprClient.StartWorkflowAsync( | ||
| workflowComponent: DaprWorkflowComponent, | ||
| workflowName: nameof(DemoWorkflow), | ||
| instanceId: instanceId, | ||
| input: isHealthy); | ||
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| await daprClient.WaitForWorkflowCompletionAsync( | ||
| workflowComponent: DaprWorkflowComponent, | ||
| instanceId: instanceId); | ||
| } |
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| <Project Sdk="Microsoft.NET.Sdk"> | ||
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| <ItemGroup> | ||
| <ProjectReference Include="..\..\..\src\Dapr.Workflow\Dapr.Workflow.csproj" /> | ||
| </ItemGroup> | ||
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| <PropertyGroup> | ||
| <OutputType>Exe</OutputType> | ||
| <TargetFramework>net6</TargetFramework> | ||
| <ImplicitUsings>enable</ImplicitUsings> | ||
| <NoWarn>612,618</NoWarn> | ||
| </PropertyGroup> | ||
|
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| </Project> |
39 changes: 39 additions & 0 deletions
39
examples/Workflow/WorkflowMonitor/Workflows/DemoWorkflow.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| using Dapr.Workflow; | ||
| using WorkflowMonitor.Activities; | ||
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| namespace WorkflowMonitor.Workflows | ||
| { | ||
| public class DemoWorkflow : Workflow<bool, bool> | ||
| { | ||
| public override async Task<bool> RunAsync(WorkflowContext context, bool isHealthy) | ||
| { | ||
| string status = await context.CallActivityAsync<string>(nameof(CheckStatus), true); | ||
| int next_sleep_interval; | ||
| if (!context.IsReplaying) | ||
| { | ||
| Console.WriteLine($"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 1s"); | ||
| 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; | ||
| } | ||
| } | ||
| } |